The user wants me to fix all the xfail tests and the failing compatibility tests. Let me create a todo list and work through them systematically.
The issues to fix are: 1. Named function expressions (test_closure.js) 2. Closure variable capture in nested functions (compatibility test) 3. Number/String/Boolean constructors 4. Block expressions returning values (if/else returning value) 5. Lookbehind regex
Let me start working on these one by one.
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
Let me start with named function expressions. The issue is that code like:
var f = function myfunc(n) {
return myfunc(n - 1); // myfunc should be available here
};
Currently myfunc is not defined inside the function body. I need to make the function name available as a local variable inside the function.
Let me first understand how function expressions are compiled:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"pattern": "FunctionExpression"
}17: FunctionDeclaration, FunctionExpression, ArrowFunctionExpression, 186: if isinstance(node, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 247: else: # FunctionExpression 260: elif isinstance(node, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 292: if isinstance(value, Node) and not isinstance(value, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 296: if isinstance(item, Node) and not isinstance(item, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 681: elif isinstance(node, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 714: def _compile_arrow_function(self, node: ArrowFunctionExpression) -> CompiledFunction: 1142: elif isinstance(node, FunctionExpression): 1152: elif isinstance(node, ArrowFunctionExpression):
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 60,
"offset": 780
}780→ self._in_function = old_in_function 781→ self._free_vars = old_free_vars 782→ self._cell_vars = old_cell_vars 783→ 784→ return func 785→ 786→ def _compile_function( 787→ self, name: str, params: List[Identifier], body: BlockStatement 788→ ) -> CompiledFunction: 789→ """Compile a function.""" 790→ # Save current state 791→ old_bytecode = self.bytecode 792→ old_constants = self.constants 793→ old_locals = self.locals 794→ old_loop_stack = self.loop_stack 795→ old_in_function = self._in_function 796→ old_free_vars = self._free_vars 797→ old_cell_vars = self._cell_vars 798→ 799→ # Push current locals to outer scope stack (for closure resolution) 800→ if self._in_function: 801→ self._outer_locals.append(old_locals[:]) 802→ 803→ # New state for function 804→ # Locals: params first, then 'arguments' reserved slot 805→ self.bytecode = [] 806→ self.constants = [] 807→ self.locals = [p.name for p in params] + ["arguments"] 808→ self.loop_stack = [] 809→ self._in_function = True 810→ 811→ # Collect all var declarations to know the full locals set 812→ local_vars_set = set(self.locals) 813→ self._collect_var_decls(body, local_vars_set) 814→ 815→ # Find variables captured by inner functions 816→ captured = self._find_captured_vars(body, local_vars_set) 817→ self._cell_vars = list(captured) 818→ 819→ # Find all free variables needed (including pass-through for nested functions) 820→ required_free = self._find_required_free_vars(body, local_vars_set) 821→ self._free_vars = list(required_free) 822→ 823→ # Compile function body 824→ for stmt in body.body: 825→ self._compile_statement(stmt) 826→ 827→ # Implicit return undefined 828→ self._emit(OpCode.RETURN_UNDEFINED) 829→ 830→ func = CompiledFunction( 831→ name=name, 832→ params=[p.name for p in params], 833→ bytecode=bytes(self.bytecode), 834→ constants=self.constants, 835→ locals=self.locals, 836→ num_locals=len(self.locals), 837→ free_vars=self._free_vars[:], 838→ cell_vars=self._cell_vars[:], 839→ ) <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
I see the issue. For named function expressions, the function name should be added as a local variable inside the function. Let me modify _compile_function to add the function name as a local when it's provided:
I need to modify _compile_function to add the function name as a local for named function expressions:
def _compile_function(
self, name: str, params: List[Identifier], body: BlockStatement
) -> CompiledFunction:
"""Compile a function."""
# Save current state
old_bytecode = self.bytecode
old_constants = self.constants
old_locals = self.locals
old_loop_stack = self.loop_stack
old_in_function = self._in_function
old_free_vars = self._free_vars
old_cell_vars = self._cell_vars
# Push current locals to outer scope stack (for closure resolution)
if self._in_function:
self._outer_locals.append(old_locals[:])
# New state for function
# Locals: params first, then 'arguments' reserved slot
self.bytecode = []
self.constants = []
self.locals = [p.name for p in params] + ["arguments"]
self.loop_stack = []
self._in_function = True def _compile_function(
self, name: str, params: List[Identifier], body: BlockStatement,
is_expression: bool = False
) -> CompiledFunction:
"""Compile a function.
Args:
name: Function name (empty for anonymous)
params: Parameter list
body: Function body
is_expression: If True and name is provided, make name available inside body
"""
# Save current state
old_bytecode = self.bytecode
old_constants = self.constants
old_locals = self.locals
old_loop_stack = self.loop_stack
old_in_function = self._in_function
old_free_vars = self._free_vars
old_cell_vars = self._cell_vars
# Push current locals to outer scope stack (for closure resolution)
if self._in_function:
self._outer_locals.append(old_locals[:])
# New state for function
# Locals: params first, then 'arguments' reserved slot
self.bytecode = []
self.constants = []
self.locals = [p.name for p in params] + ["arguments"]
# For named function expressions, add the function name as a local
# This allows recursive calls like: var f = function fact(n) { return n <= 1 ? 1 : n * fact(n-1); }
if is_expression and name:
self.locals.append(name)
self.loop_stack = []
self._in_function = TrueThe file /home/user/mquickjs-python/src/mquickjs_python/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
782→ self._cell_vars = old_cell_vars
783→
784→ return func
785→
786→ def _compile_function(
787→ self, name: str, params: List[Identifier], body: BlockStatement,
788→ is_expression: bool = False
789→ ) -> CompiledFunction:
790→ """Compile a function.
791→
792→ Args:
793→ name: Function name (empty for anonymous)
794→ params: Parameter list
795→ body: Function body
796→ is_expression: If True and name is provided, make name available inside body
797→ """
798→ # Save current state
799→ old_bytecode = self.bytecode
800→ old_constants = self.constants
801→ old_locals = self.locals
802→ old_loop_stack = self.loop_stack
803→ old_in_function = self._in_function
804→ old_free_vars = self._free_vars
805→ old_cell_vars = self._cell_vars
806→
807→ # Push current locals to outer scope stack (for closure resolution)
808→ if self._in_function:
809→ self._outer_locals.append(old_locals[:])
810→
811→ # New state for function
812→ # Locals: params first, then 'arguments' reserved slot
813→ self.bytecode = []
814→ self.constants = []
815→ self.locals = [p.name for p in params] + ["arguments"]
816→
817→ # For named function expressions, add the function name as a local
818→ # This allows recursive calls like: var f = function fact(n) { return n <= 1 ? 1 : n * fact(n-1); }
819→ if is_expression and name:
820→ self.locals.append(name)
821→
822→ self.loop_stack = []
823→ self._in_function = True
824→
825→ # Collect all var declarations to know the full locals set
826→ local_vars_set = set(self.locals)
827→ self._collect_var_decls(body, local_vars_set)Now I need to update the call site for FunctionExpression to pass is_expression=True:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 15,
"offset": 1140
}1140→ for arg in node.arguments: 1141→ self._compile_expression(arg) 1142→ self._emit(OpCode.CALL_METHOD, len(node.arguments)) 1143→ else: 1144→ # Regular call: f(args) 1145→ self._compile_expression(node.callee) 1146→ for arg in node.arguments: 1147→ self._compile_expression(arg) 1148→ self._emit(OpCode.CALL, len(node.arguments)) 1149→ 1150→ elif isinstance(node, NewExpression): 1151→ self._compile_expression(node.callee) 1152→ for arg in node.arguments: 1153→ self._compile_expression(arg) 1154→ self._emit(OpCode.NEW, len(node.arguments)) <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 20,
"offset": 1155
}1155→ 1156→ elif isinstance(node, FunctionExpression): 1157→ name = node.id.name if node.id else "" 1158→ func = self._compile_function(name, node.params, node.body) 1159→ func_idx = len(self.functions) 1160→ self.functions.append(func) 1161→ 1162→ const_idx = self._add_constant(func) 1163→ self._emit(OpCode.LOAD_CONST, const_idx) 1164→ self._emit(OpCode.MAKE_CLOSURE, func_idx) 1165→ 1166→ elif isinstance(node, ArrowFunctionExpression): 1167→ func = self._compile_arrow_function(node) 1168→ func_idx = len(self.functions) 1169→ self.functions.append(func) 1170→ 1171→ const_idx = self._add_constant(func) 1172→ self._emit(OpCode.LOAD_CONST, const_idx) 1173→ self._emit(OpCode.MAKE_CLOSURE, func_idx) 1174→ <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
The user wants me to commit after each fix. Let me update the FunctionExpression to pass is_expression=True:
elif isinstance(node, FunctionExpression):
name = node.id.name if node.id else ""
func = self._compile_function(name, node.params, node.body)
func_idx = len(self.functions) elif isinstance(node, FunctionExpression):
name = node.id.name if node.id else ""
func = self._compile_function(name, node.params, node.body, is_expression=True)
func_idx = len(self.functions)The file /home/user/mquickjs-python/src/mquickjs_python/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 1152→ for arg in node.arguments: 1153→ self._compile_expression(arg) 1154→ self._emit(OpCode.NEW, len(node.arguments)) 1155→ 1156→ elif isinstance(node, FunctionExpression): 1157→ name = node.id.name if node.id else "" 1158→ func = self._compile_function(name, node.params, node.body, is_expression=True) 1159→ func_idx = len(self.functions) 1160→ self.functions.append(func) 1161→ 1162→ const_idx = self._add_constant(func) 1163→ self._emit(OpCode.LOAD_CONST, const_idx)
Now I need to make sure the function binds itself to the local variable. When MAKE_CLOSURE is executed, we need to set the local variable to the function itself. Let me check how MAKE_CLOSURE works in the VM:
Now I need to update the VM to initialize the function name local. Let me check MAKE_CLOSURE:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"limit": 50,
"offset": 545
} 545→ elif op == OpCode.MAKE_CLOSURE:
546→ compiled_func = self.stack.pop()
547→ if isinstance(compiled_func, CompiledFunction):
548→ js_func = JSFunction(
549→ name=compiled_func.name,
550→ params=compiled_func.params,
551→ bytecode=compiled_func.bytecode,
552→ )
553→ js_func._compiled = compiled_func
554→
555→ # Capture closure cells for free variables
556→ if compiled_func.free_vars:
557→ closure_cells = []
558→ for var_name in compiled_func.free_vars:
559→ # First check if it's in our cell_storage (cell var)
560→ if frame.cell_storage and var_name in getattr(frame.func, 'cell_vars', []):
561→ idx = frame.func.cell_vars.index(var_name)
562→ # Share the same cell!
563→ closure_cells.append(frame.cell_storage[idx])
564→ elif frame.closure_cells and var_name in getattr(frame.func, 'free_vars', []):
565→ # Variable is in our own closure
566→ idx = frame.func.free_vars.index(var_name)
567→ closure_cells.append(frame.closure_cells[idx])
568→ elif var_name in frame.func.locals:
569→ # Regular local - shouldn't happen if cell_vars is working
570→ slot = frame.func.locals.index(var_name)
571→ cell = ClosureCell(frame.locals[slot])
572→ closure_cells.append(cell)
573→ else:
574→ closure_cells.append(ClosureCell(UNDEFINED))
575→ js_func._closure_cells = closure_cells
576→
577→ self.stack.append(js_func)
578→ else:
579→ self.stack.append(compiled_func)
580→
581→ else:
582→ raise NotImplementedError(f"Opcode not implemented: {op.name}")
583→
584→ def _get_name(self, frame: CallFrame, index: int) -> str:
585→ """Get a name from the name table."""
586→ # Names are stored in constants for simplicity
587→ if index < len(frame.func.constants):
588→ name = frame.func.constants[index]
589→ if isinstance(name, str):
590→ return name
591→ return f"<name_{index}>"
592→
593→ def _add(self, a: JSValue, b: JSValue) -> JSValue:
594→ """JavaScript + operator."""
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
The issue is that the function name needs to be available inside the function body when it's called. The function name is added as a local during compilation, but when the function is invoked, we need to set that local to the function itself.Let me look at _invoke_js_function to see where we initialize locals:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"limit": 60,
"offset": 1475
} 1475→ compiled = getattr(func, '_compiled', None)
1476→ if compiled is None:
1477→ raise JSTypeError("Function has no bytecode")
1478→
1479→ # Prepare locals (parameters + arguments + local variables)
1480→ locals_list = [UNDEFINED] * compiled.num_locals
1481→ for i, arg in enumerate(args):
1482→ if i < len(compiled.params):
1483→ locals_list[i] = arg
1484→
1485→ # Create 'arguments' object (stored after params in locals)
1486→ # The 'arguments' slot is at index len(compiled.params)
1487→ arguments_slot = len(compiled.params)
1488→ if arguments_slot < compiled.num_locals:
1489→ arguments_obj = JSArray()
1490→ arguments_obj._elements = list(args)
1491→ locals_list[arguments_slot] = arguments_obj
1492→
1493→ # Get closure cells from the function
1494→ closure_cells = getattr(func, '_closure_cells', None)
1495→
1496→ # Create cell storage for variables that will be captured by inner functions
1497→ cell_storage = None
1498→ if compiled.cell_vars:
1499→ cell_storage = []
1500→ for var_name in compiled.cell_vars:
1501→ # Find the initial value from locals
1502→ if var_name in compiled.locals:
1503→ slot = compiled.locals.index(var_name)
1504→ cell_storage.append(ClosureCell(locals_list[slot]))
1505→ else:
1506→ cell_storage.append(ClosureCell(UNDEFINED))
1507→
1508→ # Create new call frame
1509→ frame = CallFrame(
1510→ func=compiled,
1511→ ip=0,
1512→ bp=len(self.stack),
1513→ locals=locals_list,
1514→ this_value=this_val,
1515→ closure_cells=closure_cells,
1516→ cell_storage=cell_storage,
1517→ )
1518→ self.call_stack.append(frame)
1519→
1520→ def _new_object(self, arg_count: int) -> None:
1521→ """Create a new object with constructor."""
1522→ args = []
1523→ for _ in range(arg_count):
1524→ args.insert(0, self.stack.pop())
1525→ constructor = self.stack.pop()
1526→
1527→ if isinstance(constructor, JSFunction):
1528→ # Create new object
1529→ obj = JSObject()
1530→ # Call constructor with new object as 'this'
1531→ self._invoke_js_function(constructor, args, obj)
1532→ # Result is the new object (or returned value if object)
1533→ self.stack.append(obj)
1534→ elif isinstance(constructor, JSObject) and hasattr(constructor, '_callable'):
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I need to add the function itself to the locals if it's a named function expression. The function name would be at a slot after 'arguments'. Let me add this after initializing the arguments object:
# Create 'arguments' object (stored after params in locals)
# The 'arguments' slot is at index len(compiled.params)
arguments_slot = len(compiled.params)
if arguments_slot < compiled.num_locals:
arguments_obj = JSArray()
arguments_obj._elements = list(args)
locals_list[arguments_slot] = arguments_obj
# Get closure cells from the function # Create 'arguments' object (stored after params in locals)
# The 'arguments' slot is at index len(compiled.params)
arguments_slot = len(compiled.params)
if arguments_slot < compiled.num_locals:
arguments_obj = JSArray()
arguments_obj._elements = list(args)
locals_list[arguments_slot] = arguments_obj
# For named function expressions, bind the function name to itself
# This allows recursive calls like: var f = function fact(n) { return fact(n-1); }
if compiled.name and compiled.name in compiled.locals:
name_slot = compiled.locals.index(compiled.name)
if name_slot >= len(compiled.params) + 1: # After params and arguments
locals_list[name_slot] = func
# Get closure cells from the functionThe file /home/user/mquickjs-python/src/mquickjs_python/vm.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
1481→ for i, arg in enumerate(args):
1482→ if i < len(compiled.params):
1483→ locals_list[i] = arg
1484→
1485→ # Create 'arguments' object (stored after params in locals)
1486→ # The 'arguments' slot is at index len(compiled.params)
1487→ arguments_slot = len(compiled.params)
1488→ if arguments_slot < compiled.num_locals:
1489→ arguments_obj = JSArray()
1490→ arguments_obj._elements = list(args)
1491→ locals_list[arguments_slot] = arguments_obj
1492→
1493→ # For named function expressions, bind the function name to itself
1494→ # This allows recursive calls like: var f = function fact(n) { return fact(n-1); }
1495→ if compiled.name and compiled.name in compiled.locals:
1496→ name_slot = compiled.locals.index(compiled.name)
1497→ if name_slot >= len(compiled.params) + 1: # After params and arguments
1498→ locals_list[name_slot] = func
1499→
1500→ # Get closure cells from the function
1501→ closure_cells = getattr(func, '_closure_cells', None)
1502→
1503→ # Create cell storage for variables that will be captured by inner functions
1504→ cell_storage = Noneuv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
# Test named function expression
result = ctx.eval('''
var expr_func = function myfunc1(n) {
function myfunc2(n) {
return myfunc1(n - 1);
}
if (n == 0)
return 0;
else
return myfunc2(n);
};
expr_func(1)
''')
print('Named function expr:', result)
assert result == 0, f'Expected 0, got {result}'
print('PASSED')
"Named function expr: 0
PASSED
Building mquickjs-python @ file:///home/user/mquickjs-python
Built mquickjs-python @ file:///home/user/mquickjs-python
Uninstalled 1 package in 2ms
Installed 1 package in 7msuv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
try:
ctx.eval(open('tests/test_closure.js').read())
print('test_closure.js PASSED')
except Exception as e:
print(f'FAILED: {type(e).__name__}: {e}')
"uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
# Test the closure test step by step
result = ctx.eval('''
function assert(b, str) {
if (b) {
return;
} else {
throw \"assertion failed: \" + str;
}
}
var log_str = \"\";
function log(str) {
log_str += str + \",\";
}
function f(a, b, c) {
var x = 10;
log(\"a=\"+a);
function g(d) {
function h() {
log(\"d=\" + d);
log(\"x=\" + x);
}
log(\"b=\" + b);
log(\"c=\" + c);
h();
}
g(4);
return g;
}
var g1 = f(1, 2, 3);
g1(5);
log_str
''')
print('log_str:', result)
"uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('''
function test_closure1()
{
function f2()
{
var val = 1;
function set(a) {
val = a;
}
function get(a) {
return val;
}
return { \"set\": set, \"get\": get };
}
var obj = f2();
obj.set(10);
var r;
r = obj.get();
return r;
}
test_closure1()
''')
print('test_closure1:', result)
"uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('''
function test_closure2()
{
var expr_func = function myfunc1(n) {
function myfunc2(n) {
return myfunc1(n - 1);
}
if (n == 0)
return 0;
else
return myfunc2(n);
};
var r;
r = expr_func(1);
return r;
}
test_closure2()
''')
print('test_closure2:', result)
"uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('''
function test_closure3()
{
function fib(n)
{
if (n <= 0)
return 0;
else if (n === 1)
return 1;
else {
return fib(n - 1) + fib(n - 2);
}
}
var fib_func = function fib1(n)
{
if (n <= 0)
return 0;
else if (n == 1)
return 1;
else
return fib1(n - 1) + fib1(n - 2);
};
return [fib(6), fib_func(6)];
}
test_closure3()
''')
print('test_closure3:', result)
"Exit code 1
Traceback (most recent call last):
File "<string>", line 5, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/context.py", line 546, in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 91, in run
return self._execute()
^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 148, in _execute
self._execute_opcode(op, arg, frame)
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 456, in _execute_opcode
self._call_function(arg, None)
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 1392, in _call_function
raise JSTypeError(f"{callee} is not a function")
mquickjs_python.errors.JSTypeError: TypeError: undefined is not a functionThere's an issue. The problem might be with nested function declarations. Let me debug:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('''
function fib(n) {
if (n <= 0)
return 0;
else if (n === 1)
return 1;
else {
return fib(n - 1) + fib(n - 2);
}
}
fib(6)
''')
print('fib(6):', result)
"uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('''
function test() {
function fib(n) {
if (n <= 0)
return 0;
else if (n === 1)
return 1;
else {
return fib(n - 1) + fib(n - 2);
}
}
return fib(6);
}
test()
''')
print('nested fib:', result)
"Exit code 1
Traceback (most recent call last):
File "<string>", line 5, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/context.py", line 546, in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 91, in run
return self._execute()
^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 148, in _execute
self._execute_opcode(op, arg, frame)
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 456, in _execute_opcode
self._call_function(arg, None)
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 1392, in _call_function
raise JSTypeError(f"{callee} is not a function")
mquickjs_python.errors.JSTypeError: TypeError: undefined is not a functionInteresting! Nested recursive function declarations don't work. The issue is that nested function declarations need to be able to reference themselves. Let me debug this further:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('''
function test() {
function fib(n) {
return n;
}
return fib(6);
}
test()
''')
print('simple nested:', result)
"uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('''
function test() {
function fib(n) {
if (n <= 0)
return 0;
else
return fib(n - 1); // recursive call
}
return fib(3);
}
test()
''')
print('recursive nested:', result)
"Exit code 1
Traceback (most recent call last):
File "<string>", line 5, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/context.py", line 546, in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 91, in run
return self._execute()
^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 148, in _execute
self._execute_opcode(op, arg, frame)
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 456, in _execute_opcode
self._call_function(arg, None)
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 1392, in _call_function
raise JSTypeError(f"{callee} is not a function")
mquickjs_python.errors.JSTypeError: TypeError: undefined is not a functionThe problem is that nested function declarations can't call themselves recursively. The issue is that fib is in the parent function's scope, but when fib tries to call itself from within, it's looking for fib in the wrong place.
The issue is that nested function declarations need to: 1. Be hoisted to the top of the parent function scope (already done) 2. Be able to reference themselves via the parent scope (this is the bug)
The problem is that when fib is compiled, it doesn't know that fib is a cell variable that should be captured. Let me check how function declarations are handled.
Actually, the issue is more subtle. When fib calls itself, it's loading fib as a name. But fib should be in the parent function's locals (since it's a function declaration inside test). So fib should be accessed as a free variable from within itself, but since it's also being defined, it needs to be a cell variable.
This is the classic closure cell issue - a variable can be both: 1. A local variable (fib is declared in test) 2. Captured by an inner function (fib references itself)
So fib needs to be in cell_vars of test, and when fib is compiled, it should access fib as a free variable.
Let me check the compilation of nested function declarations:
The issue is that nested recursive function declarations need to capture themselves. Let me check how function declarations are compiled:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"pattern": "FunctionDeclaration"
}17: FunctionDeclaration, FunctionExpression, ArrowFunctionExpression, 186: if isinstance(node, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 244: if isinstance(func_node, FunctionDeclaration): 260: elif isinstance(node, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 284: elif isinstance(node, FunctionDeclaration): 292: if isinstance(value, Node) and not isinstance(value, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 296: if isinstance(item, Node) and not isinstance(item, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 629: elif isinstance(node, FunctionDeclaration): 681: elif isinstance(node, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)):
Let me look at the issue more carefully. When we have:javascript
function test() { function fib(n) { return fib(n - 1); // fib is a free variable here } return fib(3);}The fib function declaration is hoisted, so fib is a local variable of test. But inside fib, when we call fib, we need to access it through the closure.
The problem is:1. fib is declared as a local variable in test2. fib (the inner function) references fib (the local in test)3. So fib needs to be a cell variable in test, and a free variable in fibLet me check how _find_captured_vars handles this:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 60,
"offset": 181
}181→ def _find_captured_vars(self, body: Node, locals_set: set) -> set: 182→ """Find all variables captured by inner functions.""" 183→ captured = set() 184→ 185→ def visit(node): 186→ if isinstance(node, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 187→ # Found inner function - check what variables it uses 188→ inner_captured = self._find_free_vars_in_function(node, locals_set) 189→ captured.update(inner_captured) 190→ elif isinstance(node, BlockStatement): 191→ for stmt in node.body: 192→ visit(stmt) 193→ elif isinstance(node, IfStatement): 194→ visit(node.consequent) 195→ if node.alternate: 196→ visit(node.alternate) 197→ elif isinstance(node, WhileStatement): 198→ visit(node.body) 199→ elif isinstance(node, DoWhileStatement): 200→ visit(node.body) 201→ elif isinstance(node, ForStatement): 202→ visit(node.body) 203→ elif isinstance(node, ForInStatement): 204→ visit(node.body) 205→ elif isinstance(node, TryStatement): 206→ visit(node.block) 207→ if node.handler: 208→ visit(node.handler.body) 209→ if node.finalizer: 210→ visit(node.finalizer) 211→ elif isinstance(node, SwitchStatement): 212→ for case in node.cases: 213→ for stmt in case.consequent: 214→ visit(stmt) 215→ elif isinstance(node, LabeledStatement): 216→ visit(node.body) 217→ elif hasattr(node, '__dict__'): 218→ # For expression nodes (e.g., arrow function expression body) 219→ for value in node.__dict__.values(): 220→ if isinstance(value, Node): 221→ visit(value) 222→ elif isinstance(value, list): 223→ for item in value: 224→ if isinstance(item, Node): 225→ visit(item) 226→ 227→ if isinstance(body, BlockStatement): 228→ for stmt in body.body: 229→ visit(stmt) 230→ else: 231→ # Expression body (e.g., arrow function with expression) 232→ visit(body) 233→ 234→ return captured 235→ 236→ def _find_free_vars_in_function(self, func_node, outer_locals: set) -> set: 237→ """Find variables used in function that come from outer scope. 238→ 239→ Also recursively checks nested functions - if a nested function needs 240→ a variable from outer scope, this function needs to capture it too. <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 50,
"offset": 236
} 236→ def _find_free_vars_in_function(self, func_node, outer_locals: set) -> set:
237→ """Find variables used in function that come from outer scope.
238→
239→ Also recursively checks nested functions - if a nested function needs
240→ a variable from outer scope, this function needs to capture it too.
241→ """
242→ free_vars = set()
243→ # Get function's own locals (params and declared vars)
244→ if isinstance(func_node, FunctionDeclaration):
245→ params = {p.name for p in func_node.params}
246→ body = func_node.body
247→ else: # FunctionExpression
248→ params = {p.name for p in func_node.params}
249→ body = func_node.body
250→
251→ local_vars = params.copy()
252→ # Find var declarations in function
253→ self._collect_var_decls(body, local_vars)
254→
255→ # Now find identifiers used that are not local but are in outer_locals
256→ def visit_expr(node):
257→ if isinstance(node, Identifier):
258→ if node.name in outer_locals and node.name not in local_vars:
259→ free_vars.add(node.name)
260→ elif isinstance(node, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)):
261→ # Recursively check nested functions - any outer variable they need
262→ # must also be captured by this function (unless it's our local)
263→ nested_free = self._find_free_vars_in_function(node, outer_locals)
264→ for var in nested_free:
265→ if var not in local_vars:
266→ free_vars.add(var)
267→ elif hasattr(node, '__dict__'):
268→ for value in node.__dict__.values():
269→ if isinstance(value, Node):
270→ visit_expr(value)
271→ elif isinstance(value, list):
272→ for item in value:
273→ if isinstance(item, Node):
274→ visit_expr(item)
275→
276→ visit_expr(body)
277→ return free_vars
278→
279→ def _collect_var_decls(self, node, var_set: set):
280→ """Collect all var declarations in a node."""
281→ if isinstance(node, VariableDeclaration):
282→ for decl in node.declarations:
283→ var_set.add(decl.id.name)
284→ elif isinstance(node, FunctionDeclaration):
285→ var_set.add(node.id.name)
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I see the issue! In _find_free_vars_in_function, when checking a FunctionDeclaration, we add its name to local_vars (via _collect_var_decls). But the function's name is also in outer_locals (from the parent), so when the function references itself, the check node.name in outer_locals and node.name not in local_vars fails because the name IS in local_vars (it was added by _collect_var_decls).
Wait, let me trace through this more carefully:
test(), we have function fib(n) { ... }_collect_var_decls for test's body will add fib to the local_vars_set_find_captured_vars is called with that locals_setfib, _find_free_vars_in_function is called with outer_locals = {fib, ...}fib, _collect_var_decls is called, but fib is not a var declaration inside fiblocal_vars for fib only has nfib identifier, outer_locals contains fib, local_vars doesn't, so fib is added to free_varsActually this should work... Let me check what's happening at runtime. The issue might be in how the free variable is resolved.
Let me add some debug output:
uv run python -c "
from mquickjs_python import JSContext
from mquickjs_python.compiler import Compiler
from mquickjs_python.parser import Parser
from mquickjs_python.lexer import Lexer
code = '''
function test() {
function fib(n) {
if (n <= 0)
return 0;
else
return fib(n - 1);
}
return fib(3);
}
'''
lexer = Lexer(code)
parser = Parser(lexer)
ast = parser.parse()
compiler = Compiler()
compiled = compiler.compile(ast)
print('Main function:')
print(' locals:', compiled.locals)
print(' cell_vars:', compiled.cell_vars)
print(' free_vars:', compiled.free_vars)
if compiler.functions:
for i, func in enumerate(compiler.functions):
print(f'Function {i} ({func.name}):')
print(' locals:', func.locals)
print(' cell_vars:', func.cell_vars)
print(' free_vars:', func.free_vars)
"Exit code 1
Traceback (most recent call last):
File "<string>", line 20, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 43, in __init__
self.lexer = Lexer(source)
^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/lexer.py", line 16, in __init__
self.length = len(source)
^^^^^^^^^^^
TypeError: object of type 'Lexer' has no len()uv run python -c "
from mquickjs_python.compiler import Compiler
from mquickjs_python.parser import Parser
code = '''
function test() {
function fib(n) {
if (n <= 0)
return 0;
else
return fib(n - 1);
}
return fib(3);
}
'''
parser = Parser(code)
ast = parser.parse()
compiler = Compiler()
compiled = compiler.compile(ast)
print('Main function:')
print(' locals:', compiled.locals)
print(' cell_vars:', compiled.cell_vars)
print(' free_vars:', compiled.free_vars)
if compiler.functions:
for i, func in enumerate(compiler.functions):
print(f'Function {i} ({func.name}):')
print(' locals:', func.locals)
print(' cell_vars:', func.cell_vars)
print(' free_vars:', func.free_vars)
"Main function: locals: [] cell_vars: [] free_vars: [] Function 0 (fib): locals: ['n', 'arguments'] cell_vars: [] free_vars: [] Function 1 (test): locals: ['arguments', 'fib'] cell_vars: ['fib'] free_vars: []
Interesting! I can see:1. test has fib in cell_vars, which is correct (it's captured by an inner function)
2. But fib function has NO free_vars - that's the bug!fib should have fib in its free_vars since it references itself and fib is defined in the outer scope.
The issue is in how _find_free_vars_in_function handles this. When we find the function declaration, we add its name to local_vars before checking what the function body references. Let me look at the logic again:
Actually, looking at my output - the fib function comes first, then test. So the compilation order is:1. When compiling test, we find the fib function declaration2. We compile fib first (nested function)3. fib needs to know that 'fib' is a free variable
The issue is that when compiling fib, we're not passing the right outer_locals set. Let me trace through more carefully.
When compiling test, we set locals = ['arguments', 'fib'] (after collecting var decls).
Then we call _find_captured_vars(body, {'arguments', 'fib'}).
This calls _find_free_vars_in_function(fib_node, {'arguments', 'fib'}).
Inside that function:
- params = {'n'}
- body = fib's body
- local_vars = {'n'} after collecting (fib has no var declarations)
- We visit the body and find the identifier 'fib'
- Check: 'fib' in outer_locals ({'arguments', 'fib'}) -> True
- Check: 'fib' not in local_vars ({'n'}) -> True
- So 'fib' should be added to free_vars!
So the capture detection should be working. Let me re-check. Actually wait, _find_captured_vars returns the variables that OUTER functions need to capture.
I see the nuanced difference between capturing mechanisms. The compilation process reveals a subtle interaction between how variables are tracked across nested function scopes. The key challenge lies in correctly identifying when a function needs to reference itself across different compilation stages.
The compilation flow suggests we need a more sophisticated approach to tracking variable references during nested function analysis. Specifically, we must ensure that self-referential functions are correctly identified and their variable dependencies are properly resolved.
I see the issue. test.cell_vars = ['fib'] is correct (fib needs to be captured), but fib.free_vars = [] is wrong. The fib function should have fib as a free variable. Let me check the _compile_function to see how free_vars are determined:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 40,
"offset": 820
}820→ self.locals.append(name) 821→ 822→ self.loop_stack = [] 823→ self._in_function = True 824→ 825→ # Collect all var declarations to know the full locals set 826→ local_vars_set = set(self.locals) 827→ self._collect_var_decls(body, local_vars_set) 828→ 829→ # Find variables captured by inner functions 830→ captured = self._find_captured_vars(body, local_vars_set) 831→ self._cell_vars = list(captured) 832→ 833→ # Find all free variables needed (including pass-through for nested functions) 834→ required_free = self._find_required_free_vars(body, local_vars_set) 835→ self._free_vars = list(required_free) 836→ 837→ # Compile function body 838→ for stmt in body.body: 839→ self._compile_statement(stmt) 840→ 841→ # Implicit return undefined 842→ self._emit(OpCode.RETURN_UNDEFINED) 843→ 844→ func = CompiledFunction( 845→ name=name, 846→ params=[p.name for p in params], 847→ bytecode=bytes(self.bytecode), 848→ constants=self.constants, 849→ locals=self.locals, 850→ num_locals=len(self.locals), 851→ free_vars=self._free_vars[:], 852→ cell_vars=self._cell_vars[:], 853→ ) 854→ 855→ # Pop outer scope if we pushed it 856→ if old_in_function: 857→ self._outer_locals.pop() 858→ 859→ # Restore state <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
I see. When we call _find_required_free_vars, it's supposed to find variables that this function needs from outer scopes. Let me check _find_required_free_vars:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 50,
"offset": 668
} 668→ def _find_required_free_vars(self, body: Node, local_vars: set) -> set:
669→ """Find all free variables required by this function including pass-through.
670→
671→ This scans the function body for:
672→ 1. Direct identifier references to outer scope variables
673→ 2. Nested functions that need outer scope variables (pass-through)
674→ """
675→ free_vars = set()
676→
677→ def visit(node):
678→ if isinstance(node, Identifier):
679→ if node.name not in local_vars and self._is_in_outer_scope(node.name):
680→ free_vars.add(node.name)
681→ elif isinstance(node, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)):
682→ # Check nested function's free vars - we need to pass through
683→ # any outer scope vars that aren't our locals
684→ nested_params = {p.name for p in node.params}
685→ nested_locals = nested_params.copy()
686→ nested_locals.add("arguments")
687→ if isinstance(node.body, BlockStatement):
688→ self._collect_var_decls(node.body, nested_locals)
689→ nested_free = self._find_required_free_vars(node.body, nested_locals)
690→ for var in nested_free:
691→ if var not in local_vars and self._is_in_outer_scope(var):
692→ free_vars.add(var)
693→ elif isinstance(node, BlockStatement):
694→ for stmt in node.body:
695→ visit(stmt)
696→ elif hasattr(node, '__dict__'):
697→ for value in node.__dict__.values():
698→ if isinstance(value, Node):
699→ visit(value)
700→ elif isinstance(value, list):
701→ for item in value:
702→ if isinstance(item, Node):
703→ visit(item)
704→
705→ if isinstance(body, BlockStatement):
706→ for stmt in body.body:
707→ visit(stmt)
708→ else:
709→ # Expression body
710→ visit(body)
711→
712→ return free_vars
713→
714→ def _compile_arrow_function(self, node: ArrowFunctionExpression) -> CompiledFunction:
715→ """Compile an arrow function."""
716→ # Save current state
717→ old_bytecode = self.bytecode
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I see! The problem is in line 679: self._is_in_outer_scope(node.name). When compiling fib, we check if fib is in outer scope. Let me check what _is_in_outer_scope returns:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"pattern": "def _is_in_outer_scope"
}{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 15,
"offset": 168
}168→ def _is_in_outer_scope(self, name: str) -> bool: 169→ """Check if name exists in any outer scope.""" 170→ for outer_locals in self._outer_locals: 171→ if name in outer_locals: 172→ return True 173→ return False 174→ 175→ def _get_cell_var(self, name: str) -> Optional[int]: 176→ """Get cell variable slot, or None if not a cell var.""" 177→ if name in self._cell_vars: 178→ return self._cell_vars.index(name) 179→ return None 180→ 181→ def _find_captured_vars(self, body: Node, locals_set: set) -> set: 182→ """Find all variables captured by inner functions.""" <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
I see! The issue is that _is_in_outer_scope checks self._outer_locals, which is populated when we push the current function's locals before compiling a nested function.But here's the problem: when we compile test, we compile the fib function as part of compiling test. But at the time we call _find_required_free_vars for fib, we're calling it BEFORE we've actually pushed test's locals to _outer_locals!Let me trace through more carefully:1. Compile test: - self._outer_locals.append(old_locals[:]) - this is called if old_in_function is True (line 808) - But at this point, old_in_function is False (we're compiling test, which is at the top level) - So _outer_locals is still empty! - Then we call _find_required_free_vars(body, local_vars_set) which looks for free vars in test's body - When it encounters the nested fib function declaration, it calls _find_required_free_vars(fib's body, fib's locals) - But _outer_locals is still empty, so _is_in_outer_scope('fib') returns False!The fix is: when analyzing nested functions for their free variables, we need to consider the current function's locals as part of the outer scope. We need to pass local_vars to _is_in_outer_scope or modify the logic.Actually, the simpler fix is to push the current function's locals to _outer_locals BEFORE we call _find_required_free_vars. Let me modify the code:
I found the bug. When calling _find_required_free_vars, we need to have pushed the current function's locals to _outer_locals first. Let me fix this:
self.loop_stack = []
self._in_function = True
# Collect all var declarations to know the full locals set
local_vars_set = set(self.locals)
self._collect_var_decls(body, local_vars_set)
# Find variables captured by inner functions
captured = self._find_captured_vars(body, local_vars_set)
self._cell_vars = list(captured)
# Find all free variables needed (including pass-through for nested functions)
required_free = self._find_required_free_vars(body, local_vars_set)
self._free_vars = list(required_free) self.loop_stack = []
self._in_function = True
# Collect all var declarations to know the full locals set
local_vars_set = set(self.locals)
self._collect_var_decls(body, local_vars_set)
# Update locals list with collected vars
for var in local_vars_set:
if var not in self.locals:
self.locals.append(var)
# Push current locals to outer scope stack BEFORE finding free vars
# This is needed so nested functions can find their outer variables
self._outer_locals.append(self.locals[:])
# Find variables captured by inner functions
captured = self._find_captured_vars(body, local_vars_set)
self._cell_vars = list(captured)
# Find all free variables needed (including pass-through for nested functions)
required_free = self._find_required_free_vars(body, local_vars_set)
self._free_vars = list(required_free)
# Pop the outer scope we pushed
self._outer_locals.pop()The file /home/user/mquickjs-python/src/mquickjs_python/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
818→ # This allows recursive calls like: var f = function fact(n) { return n <= 1 ? 1 : n * fact(n-1); }
819→ if is_expression and name:
820→ self.locals.append(name)
821→
822→ self.loop_stack = []
823→ self._in_function = True
824→
825→ # Collect all var declarations to know the full locals set
826→ local_vars_set = set(self.locals)
827→ self._collect_var_decls(body, local_vars_set)
828→ # Update locals list with collected vars
829→ for var in local_vars_set:
830→ if var not in self.locals:
831→ self.locals.append(var)
832→
833→ # Push current locals to outer scope stack BEFORE finding free vars
834→ # This is needed so nested functions can find their outer variables
835→ self._outer_locals.append(self.locals[:])
836→
837→ # Find variables captured by inner functions
838→ captured = self._find_captured_vars(body, local_vars_set)
839→ self._cell_vars = list(captured)
840→
841→ # Find all free variables needed (including pass-through for nested functions)
842→ required_free = self._find_required_free_vars(body, local_vars_set)
843→ self._free_vars = list(required_free)
844→
845→ # Pop the outer scope we pushed
846→ self._outer_locals.pop()
847→
848→ # Compile function body
849→ for stmt in body.body:
850→ self._compile_statement(stmt)uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('''
function test() {
function fib(n) {
if (n <= 0)
return 0;
else
return fib(n - 1);
}
return fib(3);
}
test()
''')
print('recursive nested:', result)
assert result == 0
print('PASSED')
"Exit code 1
Traceback (most recent call last):
File "<string>", line 5, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/context.py", line 546, in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 91, in run
return self._execute()
^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 148, in _execute
self._execute_opcode(op, arg, frame)
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 456, in _execute_opcode
self._call_function(arg, None)
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 1392, in _call_function
raise JSTypeError(f"{callee} is not a function")
mquickjs_python.errors.JSTypeError: TypeError: undefined is not a functionuv run python -c "
from mquickjs_python.compiler import Compiler
from mquickjs_python.parser import Parser
code = '''
function test() {
function fib(n) {
if (n <= 0)
return 0;
else
return fib(n - 1);
}
return fib(3);
}
'''
parser = Parser(code)
ast = parser.parse()
compiler = Compiler()
compiled = compiler.compile(ast)
print('Main function:')
print(' locals:', compiled.locals)
print(' cell_vars:', compiled.cell_vars)
print(' free_vars:', compiled.free_vars)
if compiler.functions:
for i, func in enumerate(compiler.functions):
print(f'Function {i} ({func.name}):')
print(' locals:', func.locals)
print(' cell_vars:', func.cell_vars)
print(' free_vars:', func.free_vars)
"Main function: locals: [] cell_vars: [] free_vars: [] Function 0 (fib): locals: ['n', 'arguments'] cell_vars: [] free_vars: ['fib'] Function 1 (test): locals: ['arguments', 'fib'] cell_vars: ['fib'] free_vars: []
Now fib has free_vars: ['fib'] which is correct. But the test still fails at runtime. The issue might be in how we handle the closure cells. Let me check how the free variable is being accessed at runtime.
Let me look at how LOAD_CLOSURE works:
Now fib.free_vars = ['fib'] which is correct! But it still fails at runtime. Let me check how closures are resolved:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"pattern": "OpCode.LOAD_CLOSURE"
}138: OpCode.LOAD_CLOSURE, OpCode.STORE_CLOSURE, 213: elif op == OpCode.LOAD_CLOSURE: 1439: OpCode.LOAD_CLOSURE, OpCode.STORE_CLOSURE,
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"limit": 20,
"offset": 211
} 211→ self.globals[name] = self.stack[-1]
212→
213→ elif op == OpCode.LOAD_CLOSURE:
214→ if frame.closure_cells and arg < len(frame.closure_cells):
215→ self.stack.append(frame.closure_cells[arg].value)
216→ else:
217→ raise JSReferenceError("Closure variable not found")
218→
219→ elif op == OpCode.STORE_CLOSURE:
220→ if frame.closure_cells and arg < len(frame.closure_cells):
221→ frame.closure_cells[arg].value = self.stack[-1]
222→ else:
223→ raise JSReferenceError("Closure variable not found")
224→
225→ elif op == OpCode.LOAD_CELL:
226→ if frame.cell_storage and arg < len(frame.cell_storage):
227→ self.stack.append(frame.cell_storage[arg].value)
228→ else:
229→ raise JSReferenceError("Cell variable not found")
230→
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I see. When fib accesses itself, it uses LOAD_CLOSURE which needs frame.closure_cells to have the fib function. Let me check how MAKE_CLOSURE sets up closure cells:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"limit": 40,
"offset": 545
} 545→ elif op == OpCode.MAKE_CLOSURE:
546→ compiled_func = self.stack.pop()
547→ if isinstance(compiled_func, CompiledFunction):
548→ js_func = JSFunction(
549→ name=compiled_func.name,
550→ params=compiled_func.params,
551→ bytecode=compiled_func.bytecode,
552→ )
553→ js_func._compiled = compiled_func
554→
555→ # Capture closure cells for free variables
556→ if compiled_func.free_vars:
557→ closure_cells = []
558→ for var_name in compiled_func.free_vars:
559→ # First check if it's in our cell_storage (cell var)
560→ if frame.cell_storage and var_name in getattr(frame.func, 'cell_vars', []):
561→ idx = frame.func.cell_vars.index(var_name)
562→ # Share the same cell!
563→ closure_cells.append(frame.cell_storage[idx])
564→ elif frame.closure_cells and var_name in getattr(frame.func, 'free_vars', []):
565→ # Variable is in our own closure
566→ idx = frame.func.free_vars.index(var_name)
567→ closure_cells.append(frame.closure_cells[idx])
568→ elif var_name in frame.func.locals:
569→ # Regular local - shouldn't happen if cell_vars is working
570→ slot = frame.func.locals.index(var_name)
571→ cell = ClosureCell(frame.locals[slot])
572→ closure_cells.append(cell)
573→ else:
574→ closure_cells.append(ClosureCell(UNDEFINED))
575→ js_func._closure_cells = closure_cells
576→
577→ self.stack.append(js_func)
578→ else:
579→ self.stack.append(compiled_func)
580→
581→ else:
582→ raise NotImplementedError(f"Opcode not implemented: {op.name}")
583→
584→ def _get_name(self, frame: CallFrame, index: int) -> str:
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I see the issue now. When we create the fib closure, we check if fib is in frame.cell_storage. It should be, since test has cell_vars: ['fib'].
But there's a chicken-and-egg problem: when we create the fib JSFunction, we need to store it in the cell so that fib can reference itself. But we're creating the cell BEFORE we have the JSFunction created!
The flow is:
1. We compile test and create bytecode that includes MAKE_CLOSURE for fib
2. At runtime, we execute test:
- We need to set up cell_storage for 'fib' (a ClosureCell)
- But initially, the cell has UNDEFINED
3. MAKE_CLOSURE is executed:
- We create the JSFunction for fib
- We look for 'fib' in frame.cell_storage - it's there but has value UNDEFINED
- We set up the closure cell for fib, pointing to the same cell
4. Now fib can reference itself through the closure cell
5. We need to store the created JSFunction back into the cell!
The issue is that after MAKE_CLOSURE creates the function, we need to also store it in the cell. This happens when we do function fib() {} - the function declaration stores the function in its local.
But wait, function declarations should be hoisted and the store should happen. Let me check how function declarations are compiled:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 30,
"offset": 625
}625→ self._patch_jump(pos) 626→ 627→ self.loop_stack.pop() 628→ 629→ elif isinstance(node, FunctionDeclaration): 630→ # Compile function 631→ func = self._compile_function(node.id.name, node.params, node.body) 632→ func_idx = len(self.functions) 633→ self.functions.append(func) 634→ 635→ const_idx = self._add_constant(func) 636→ self._emit(OpCode.LOAD_CONST, const_idx) 637→ self._emit(OpCode.MAKE_CLOSURE, func_idx) 638→ 639→ name = node.id.name 640→ if self._in_function: 641→ # Inside function: use local variable 642→ self._add_local(name) 643→ slot = self._get_local(name) 644→ self._emit(OpCode.STORE_LOCAL, slot) 645→ else: 646→ # At program level: use global variable 647→ idx = self._add_name(name) 648→ self._emit(OpCode.STORE_NAME, idx) 649→ self._emit(OpCode.POP) 650→ 651→ elif isinstance(node, LabeledStatement): 652→ # Create a loop context for the label 653→ loop_ctx = LoopContext(label=node.label.name) 654→ self.loop_stack.append(loop_ctx) <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
I see. When a FunctionDeclaration is inside a function, we use STORE_LOCAL. But if fib is a cell variable (it's captured by itself for recursion), we need to use STORE_CELL instead!Let me check how we handle cell variables in stores:
The issue is that when storing a cell variable, we need to use STORE_CELL, not STORE_LOCAL. Let me fix the function declaration compilation:
elif isinstance(node, FunctionDeclaration):
# Compile function
func = self._compile_function(node.id.name, node.params, node.body)
func_idx = len(self.functions)
self.functions.append(func)
const_idx = self._add_constant(func)
self._emit(OpCode.LOAD_CONST, const_idx)
self._emit(OpCode.MAKE_CLOSURE, func_idx)
name = node.id.name
if self._in_function:
# Inside function: use local variable
self._add_local(name)
slot = self._get_local(name)
self._emit(OpCode.STORE_LOCAL, slot)
else:
# At program level: use global variable
idx = self._add_name(name)
self._emit(OpCode.STORE_NAME, idx)
self._emit(OpCode.POP) elif isinstance(node, FunctionDeclaration):
# Compile function
func = self._compile_function(node.id.name, node.params, node.body)
func_idx = len(self.functions)
self.functions.append(func)
const_idx = self._add_constant(func)
self._emit(OpCode.LOAD_CONST, const_idx)
self._emit(OpCode.MAKE_CLOSURE, func_idx)
name = node.id.name
if self._in_function:
# Inside function: use local or cell variable
cell_idx = self._get_cell_var(name)
if cell_idx is not None:
# Variable is captured - store in cell
self._emit(OpCode.STORE_CELL, cell_idx)
else:
# Regular local
self._add_local(name)
slot = self._get_local(name)
self._emit(OpCode.STORE_LOCAL, slot)
else:
# At program level: use global variable
idx = self._add_name(name)
self._emit(OpCode.STORE_NAME, idx)
self._emit(OpCode.POP)The file /home/user/mquickjs-python/src/mquickjs_python/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 625→ self._patch_jump(pos) 626→ 627→ self.loop_stack.pop() 628→ 629→ elif isinstance(node, FunctionDeclaration): 630→ # Compile function 631→ func = self._compile_function(node.id.name, node.params, node.body) 632→ func_idx = len(self.functions) 633→ self.functions.append(func) 634→ 635→ const_idx = self._add_constant(func) 636→ self._emit(OpCode.LOAD_CONST, const_idx) 637→ self._emit(OpCode.MAKE_CLOSURE, func_idx) 638→ 639→ name = node.id.name 640→ if self._in_function: 641→ # Inside function: use local or cell variable 642→ cell_idx = self._get_cell_var(name) 643→ if cell_idx is not None: 644→ # Variable is captured - store in cell 645→ self._emit(OpCode.STORE_CELL, cell_idx) 646→ else: 647→ # Regular local 648→ self._add_local(name) 649→ slot = self._get_local(name) 650→ self._emit(OpCode.STORE_LOCAL, slot) 651→ else: 652→ # At program level: use global variable 653→ idx = self._add_name(name) 654→ self._emit(OpCode.STORE_NAME, idx) 655→ self._emit(OpCode.POP) 656→ 657→ elif isinstance(node, LabeledStatement): 658→ # Create a loop context for the label 659→ loop_ctx = LoopContext(label=node.label.name)
Similarly, when we load the function for calling, we need to use LOAD_CELL instead of LOAD_LOCAL. Let me check how identifiers are compiled:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"pattern": "isinstance.*Identifier.*:$"
}257: if isinstance(node, Identifier): 462: elif isinstance(node.left, Identifier): 684: if isinstance(node, Identifier): 913: elif isinstance(node, Identifier): 943: if isinstance(prop.key, Identifier): 981: if isinstance(node.argument, Identifier): 1071: if isinstance(node.left, Identifier):
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 35,
"offset": 910
}910→ idx = self._add_constant((node.pattern, node.flags)) 911→ self._emit(OpCode.BUILD_REGEX, idx) 912→ 913→ elif isinstance(node, Identifier): 914→ name = node.name 915→ # Check if it's a cell var (local that's captured by inner function) 916→ cell_slot = self._get_cell_var(name) 917→ if cell_slot is not None: 918→ self._emit(OpCode.LOAD_CELL, cell_slot) 919→ else: 920→ slot = self._get_local(name) 921→ if slot is not None: 922→ self._emit(OpCode.LOAD_LOCAL, slot) 923→ else: 924→ # Check if it's a free variable (from outer scope) 925→ closure_slot = self._get_free_var(name) 926→ if closure_slot is not None: 927→ self._emit(OpCode.LOAD_CLOSURE, closure_slot) 928→ else: 929→ idx = self._add_name(name) 930→ self._emit(OpCode.LOAD_NAME, idx) 931→ 932→ elif isinstance(node, ThisExpression): 933→ self._emit(OpCode.THIS) 934→ 935→ elif isinstance(node, ArrayExpression): 936→ for elem in node.elements: 937→ self._compile_expression(elem) 938→ self._emit(OpCode.BUILD_ARRAY, len(node.elements)) 939→ 940→ elif isinstance(node, ObjectExpression): 941→ for prop in node.properties: 942→ # Key 943→ if isinstance(prop.key, Identifier): 944→ idx = self._add_constant(prop.key.name) <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
The identifier compilation looks correct - it checks cell vars, then locals, then free vars. But wait, the issue is with the cell loading from within fib. When fib accesses itself, it's not a cell var of fib (since fib doesn't define fib, test does). It's a FREE variable of fib.So the check for cell_slot at line 916-918 checks if the name is a cell var of the CURRENT function. But we also need to check if it's a free variable. The code does that at lines 924-927.So the loading is correct. Let me re-check the issue. Maybe the problem is in setting up the initial cell value.
Actually, wait. When we call return fib(3) in test, we load fib. For test, fib is a cell var. So we should emit LOAD_CELL. Let me check if that's happening:
uv run python -c "
from mquickjs_python.compiler import Compiler
from mquickjs_python.parser import Parser
from mquickjs_python.opcodes import disassemble
code = '''
function test() {
function fib(n) {
if (n <= 0)
return 0;
else
return fib(n - 1);
}
return fib(3);
}
'''
parser = Parser(code)
ast = parser.parse()
compiler = Compiler()
compiled = compiler.compile(ast)
print('=== test function bytecode ===')
test_func = compiler.functions[1] # test is second
print('Locals:', test_func.locals)
print('Cell vars:', test_func.cell_vars)
print('Free vars:', test_func.free_vars)
print(disassemble(test_func.bytecode, test_func.constants))
print()
print('=== fib function bytecode ===')
fib_func = compiler.functions[0] # fib is first
print('Locals:', fib_func.locals)
print('Cell vars:', fib_func.cell_vars)
print('Free vars:', fib_func.free_vars)
print(disassemble(fib_func.bytecode, fib_func.constants))
"Exit code 1
Traceback (most recent call last):
File "<string>", line 28, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/opcodes.py", line 120, in disassemble
op = OpCode(bytecode[i])
^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/enum.py", line 714, in __call__
return cls.__new__(cls, value)
^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/enum.py", line 1137, in __new__
raise ve_exc
ValueError: 0 is not a valid OpCode
=== test function bytecode ===
Locals: ['arguments', 'fib']
Cell vars: ['fib']
Free vars: []Hmm, there's a bytecode issue. Looks like there's an invalid opcode 0. Let me check what OpCode 0 is:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/opcodes.py",
"limit": 15,
"offset": 1
} 1→"""Bytecode opcodes for the JavaScript VM."""
2→
3→from enum import IntEnum, auto
4→
5→
6→class OpCode(IntEnum):
7→ """Bytecode operation codes."""
8→
9→ # Stack operations
10→ POP = auto() # Pop and discard top of stack
11→ DUP = auto() # Duplicate top of stack
12→ SWAP = auto() # Swap top two stack items
13→ ROT3 = auto() # Rotate 3 items: a, b, c -> b, c, a
14→
15→ # Constants
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
auto() starts at 1, so opcode 0 is invalid. The bytecode must have zeros in it that shouldn't be there. Let me print the raw bytecode:
uv run python -c "
from mquickjs_python.compiler import Compiler
from mquickjs_python.parser import Parser
code = '''
function test() {
function fib(n) {
if (n <= 0)
return 0;
else
return fib(n - 1);
}
return fib(3);
}
'''
parser = Parser(code)
ast = parser.parse()
compiler = Compiler()
compiled = compiler.compile(ast)
print('=== test function ===')
test_func = compiler.functions[1] # test is second
print('Bytecode:', list(test_func.bytecode))
print('Locals:', test_func.locals)
print('Cell vars:', test_func.cell_vars)
print()
print('=== fib function ===')
fib_func = compiler.functions[0] # fib is first
print('Bytecode:', list(fib_func.bytecode))
print('Locals:', fib_func.locals)
print('Free vars:', fib_func.free_vars)
"=== test function === Bytecode: [5, 0, 66, 0, 70, 0, 1, 69, 0, 5, 1, 50, 1, 52, 53] Locals: ['arguments', 'fib'] Cell vars: ['fib'] === fib function === Bytecode: [12, 0, 5, 0, 36, 48, 14, 0, 5, 0, 52, 47, 24, 0, 67, 0, 12, 0, 5, 1, 21, 50, 1, 52, 53] Locals: ['n', 'arguments'] Free vars: ['fib']
The bytecodes look valid (no zeros). The issue is that when I index, the function is at index 1 not 0. Let me skip the disassembly issue and just test the actual runtime:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('''
function test() {
function fib(n) {
if (n <= 0)
return 0;
else
return fib(n - 1);
}
return fib(3);
}
test()
''')
print('Result:', result)
"uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
try:
ctx.eval(open('tests/test_closure.js').read())
print('test_closure.js PASSED')
except Exception as e:
print(f'FAILED: {type(e).__name__}: {e}')
"uv run pytest tests/ --ignore=tests/basic -x --tb=short 2>&1 | tail -20
tests/test_compatibility.py:158: in test_closure
py, c = run_both("""
tests/test_compatibility.py:23: in run_both
py_result = py_ctx.eval(js_code)
^^^^^^^^^^^^^^^^^^^^
src/mquickjs_python/context.py:546: in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
src/mquickjs_python/vm.py:91: in run
return self._execute()
^^^^^^^^^^^^^^^
src/mquickjs_python/vm.py:148: in _execute
self._execute_opcode(op, arg, frame)
src/mquickjs_python/vm.py:207: in _execute_opcode
raise JSReferenceError(f"{name} is not defined")
E mquickjs_python.errors.JSReferenceError: ReferenceError: count is not defined
=========================== short test summary info ============================
FAILED tests/test_compatibility.py::TestCompatibilityFunctions::test_closure
!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!
========================= 1 failed, 35 passed in 0.44s =========================There's still a closure issue with the compatibility test. Let me check what the test is:
{
"file_path": "/home/user/mquickjs-python/tests/test_compatibility.py",
"limit": 20,
"offset": 155
} 155→ assert py == c == 7
156→
157→ def test_closure(self):
158→ py, c = run_both("""
159→ function makeCounter() {
160→ var count = 0;
161→ return function() { return ++count; };
162→ }
163→ var counter = makeCounter();
164→ counter(); counter(); counter()
165→ """)
166→ assert py == c == 3
167→
168→ def test_arrow_function(self):
169→ py, c = run_both("((x) => x * 2)(5)")
170→ assert py == c == 10
171→
172→
173→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
174→class TestCompatibilityControlFlow:
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
This is the classic closure pattern - returning a function that captures a variable. The issue is that count is not being found. Let me debug this:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('''
function makeCounter() {
var count = 0;
return function() { return ++count; };
}
var counter = makeCounter();
counter()
''')
print('Result:', result)
"Exit code 1
Traceback (most recent call last):
File "<string>", line 5, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/context.py", line 546, in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 91, in run
return self._execute()
^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 148, in _execute
self._execute_opcode(op, arg, frame)
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 207, in _execute_opcode
raise JSReferenceError(f"{name} is not defined")
mquickjs_python.errors.JSReferenceError: ReferenceError: count is not defineduv run python -c "
from mquickjs_python.compiler import Compiler
from mquickjs_python.parser import Parser
code = '''
function makeCounter() {
var count = 0;
return function() { return ++count; };
}
'''
parser = Parser(code)
ast = parser.parse()
compiler = Compiler()
compiled = compiler.compile(ast)
print('Main:')
print(' locals:', compiled.locals)
print()
for i, func in enumerate(compiler.functions):
print(f'Function {i} ({func.name}):')
print(' locals:', func.locals)
print(' cell_vars:', func.cell_vars)
print(' free_vars:', func.free_vars)
"Main: locals: [] Function 0 (): locals: ['arguments'] cell_vars: [] free_vars: ['count'] Function 1 (makeCounter): locals: ['arguments', 'count'] cell_vars: ['count'] free_vars: []
The compilation looks correct! The anonymous function has free_vars: ['count'] and makeCounter has cell_vars: ['count']. So the compilation is correct. The issue must be at runtime.Let me check how the closure is being set up. The problem is likely in how the anonymous function gets its closure cells.
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
# Simpler test
result = ctx.eval('''
function outer() {
var x = 10;
return function inner() { return x; };
}
var f = outer();
f()
''')
print('Result:', result)
"uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
# Test with increment
result = ctx.eval('''
function outer() {
var x = 0;
return function inner() { x = x + 1; return x; };
}
var f = outer();
f()
''')
print('Result:', result)
"That works too. The issue is specifically with ++count prefix increment on a closure variable. Let me test:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
# Test with prefix increment
result = ctx.eval('''
function outer() {
var x = 0;
return function inner() { return ++x; };
}
var f = outer();
f()
''')
print('Result:', result)
"Exit code 1
Traceback (most recent call last):
File "<string>", line 6, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/context.py", line 546, in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 91, in run
return self._execute()
^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 148, in _execute
self._execute_opcode(op, arg, frame)
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 207, in _execute_opcode
raise JSReferenceError(f"{name} is not defined")
mquickjs_python.errors.JSReferenceError: ReferenceError: x is not definedFound it! The issue is with prefix increment ++x on a closure variable. Let me check how UpdateExpression is compiled:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"pattern": "UpdateExpression"
}8: UnaryExpression, UpdateExpression, BinaryExpression, LogicalExpression, 979: elif isinstance(node, UpdateExpression):
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 50,
"offset": 979
} 979→ elif isinstance(node, UpdateExpression):
980→ # ++x or x++
981→ if isinstance(node.argument, Identifier):
982→ name = node.argument.name
983→ slot = self._get_local(name)
984→ if slot is not None:
985→ self._emit(OpCode.LOAD_LOCAL, slot)
986→ if node.prefix:
987→ self._emit(OpCode.INC if node.operator == "++" else OpCode.DEC)
988→ self._emit(OpCode.DUP)
989→ self._emit(OpCode.STORE_LOCAL, slot)
990→ self._emit(OpCode.POP)
991→ else:
992→ self._emit(OpCode.DUP)
993→ self._emit(OpCode.INC if node.operator == "++" else OpCode.DEC)
994→ self._emit(OpCode.STORE_LOCAL, slot)
995→ self._emit(OpCode.POP)
996→ else:
997→ idx = self._add_name(name)
998→ self._emit(OpCode.LOAD_NAME, idx)
999→ if node.prefix:
1000→ self._emit(OpCode.INC if node.operator == "++" else OpCode.DEC)
1001→ self._emit(OpCode.DUP)
1002→ self._emit(OpCode.STORE_NAME, idx)
1003→ self._emit(OpCode.POP)
1004→ else:
1005→ self._emit(OpCode.DUP)
1006→ self._emit(OpCode.INC if node.operator == "++" else OpCode.DEC)
1007→ self._emit(OpCode.STORE_NAME, idx)
1008→ self._emit(OpCode.POP)
1009→ else:
1010→ raise NotImplementedError("Update expression on non-identifier")
1011→
1012→ elif isinstance(node, BinaryExpression):
1013→ self._compile_expression(node.left)
1014→ self._compile_expression(node.right)
1015→ op_map = {
1016→ "+": OpCode.ADD,
1017→ "-": OpCode.SUB,
1018→ "*": OpCode.MUL,
1019→ "/": OpCode.DIV,
1020→ "%": OpCode.MOD,
1021→ "**": OpCode.POW,
1022→ "&": OpCode.BAND,
1023→ "|": OpCode.BOR,
1024→ "^": OpCode.BXOR,
1025→ "<<": OpCode.SHL,
1026→ ">>": OpCode.SHR,
1027→ ">>>": OpCode.USHR,
1028→ "<": OpCode.LT,
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
This session is being continued from a previous conversation that ran out of context. The conversation is summarized below: Analysis: Let me chronologically analyze the conversation:
Initial Context: This is a continuation from a previous session about mquickjs-python (a pure Python JavaScript engine). The previous session had implemented regex engine, string regex methods, arrow functions, and Function.prototype methods (bind/call/apply).
User Request - Compatibility Tests: User asked to see tests that pass both the C and Python implementations the same way. I:
quickjs C library via piptests/test_compatibility.py with 45 tests comparing both implementations5 failures identified: closure capture, block expressions, Number/String/Boolean constructors
User Request - Fix xfail tests: User said "Finish it, do everything needed to fix those tests"
Work on Named Function Expressions:
_compile_function to add is_expression parameteris_expression=True and name is provided_invoke_js_function to bind function name to itself for recursive callsThis fixed test_closure.js test_closure2 case
Work on Nested Recursive Functions:
fib is defined inside test(), and fib calls itself, the closure chain wasn't set up correctly_outer_locals BEFORE calling _find_required_free_varsSTORE_CELL instead of STORE_LOCALThis fixed test_closure.js completely
Current Work - UpdateExpression on Closure Variables:
++x (prefix increment) on closure variables failsUpdateExpression compilation doesn't check for cell vars or free varsKey files modified:
- src/mquickjs_python/compiler.py - multiple changes for closure handling
- src/mquickjs_python/vm.py - function name binding for named expressions
- tests/test_compatibility.py - new file for C/Python comparison tests
Summary: 1. Primary Request and Intent: - User initially asked to see tests that pass both C and Python implementations - User then requested: "Finish it, do everything needed to fix those tests" - meaning fix all xfail tests and failing compatibility tests - User specified: "Commit at each step once tests pass"
LOAD_CELL/STORE_CELL vs LOAD_CLOSURE/STORE_CLOSURE opcodes
Files and Code Sections:
tests/test_compatibility.py (created)
src/mquickjs_python/compiler.py (modified multiple times)
is_expression parameter to _compile_function:
python
def _compile_function(
self, name: str, params: List[Identifier], body: BlockStatement,
is_expression: bool = False
) -> CompiledFunction:
# ...
if is_expression and name:
self.locals.append(name)python
# Push current locals to outer scope stack BEFORE finding free vars
self._outer_locals.append(self.locals[:])
# ... find vars ...
self._outer_locals.pop()python
if self._in_function:
cell_idx = self._get_cell_var(name)
if cell_idx is not None:
self._emit(OpCode.STORE_CELL, cell_idx)
else:
self._add_local(name)
slot = self._get_local(name)
self._emit(OpCode.STORE_LOCAL, slot)src/mquickjs_python/vm.py (modified)
python
# For named function expressions, bind the function name to itself
if compiled.name and compiled.name in compiled.locals:
name_slot = compiled.locals.index(compiled.name)
if name_slot >= len(compiled.params) + 1:
locals_list[name_slot] = funcErrors and fixes:
Named function expressions not working (e.g., function myfunc() { return myfunc; }):
is_expression=True_invoke_js_functionNested recursive functions failing (e.g., function test() { function fib(n) { return fib(n-1); } }):
_is_in_outer_scope returned False because _outer_locals wasn't populated_outer_locals before calling _find_required_free_varsSTORE_CELL instead of STORE_LOCAL for captured function declarationsUpdateExpression on closure variables (++x where x is captured):
Problem Solving:
test_closure fails because ++count on closure variable failsRoot cause identified: UpdateExpression at line 979-1010 in compiler.py doesn't handle cell/closure variables
All user messages:
"Commit at each step once tests pass"
Pending Tasks:
Other xfail tests (test_loop.js, test_language.js, etc.)
Current Work:
Fixing UpdateExpression compilation to handle closure variables. The test failing is:
javascript
function makeCounter() {
var count = 0;
return function() { return ++count; };
}
The bug is in compiler.py lines 979-1010. The current code only handles: - Local variables (LOAD_LOCAL/STORE_LOCAL) - Global names (LOAD_NAME/STORE_NAME)
It doesn't handle: - Cell variables (LOAD_CELL/STORE_CELL) - for variables captured by inner functions - Free variables (LOAD_CLOSURE/STORE_CLOSURE) - for accessing outer scope variables
python
# Current Identifier handling that works:
cell_slot = self._get_cell_var(name)
if cell_slot is not None:
self._emit(OpCode.LOAD_CELL, cell_slot)
else:
slot = self._get_local(name)
if slot is not None:
self._emit(OpCode.LOAD_LOCAL, slot)
else:
closure_slot = self._get_free_var(name)
if closure_slot is not None:
self._emit(OpCode.LOAD_CLOSURE, closure_slot)The UpdateExpression code at line 983 only does slot = self._get_local(name) without checking cell vars or free vars first..
Please continue the conversation from where we left it off without asking the user any further questions. Continue with the last task that you were asked to work on.
The user wants me to continue working on the task. Based on the summary, I was in the middle of fixing UpdateExpression compilation to handle closure variables. The test failing is:
function makeCounter() {
var count = 0;
return function() { return ++count; };
}
The bug is in compiler.py lines 979-1010. I need to fix the UpdateExpression compilation to handle cell and closure variables, not just local variables and globals.
Let me first read the relevant section of compiler.py to see the current UpdateExpression implementation.
I'll continue fixing the UpdateExpression compilation to handle closure variables. Let me first read the relevant section of the compiler:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 60,
"offset": 970
} 970→ else:
971→ idx = self._add_constant(node.argument.property.name)
972→ self._emit(OpCode.LOAD_CONST, idx)
973→ self._emit(OpCode.DELETE_PROP)
974→ else:
975→ self._emit(OpCode.LOAD_TRUE) # delete on non-property returns true
976→ else:
977→ raise NotImplementedError(f"Unary operator: {node.operator}")
978→
979→ elif isinstance(node, UpdateExpression):
980→ # ++x or x++
981→ if isinstance(node.argument, Identifier):
982→ name = node.argument.name
983→ slot = self._get_local(name)
984→ if slot is not None:
985→ self._emit(OpCode.LOAD_LOCAL, slot)
986→ if node.prefix:
987→ self._emit(OpCode.INC if node.operator == "++" else OpCode.DEC)
988→ self._emit(OpCode.DUP)
989→ self._emit(OpCode.STORE_LOCAL, slot)
990→ self._emit(OpCode.POP)
991→ else:
992→ self._emit(OpCode.DUP)
993→ self._emit(OpCode.INC if node.operator == "++" else OpCode.DEC)
994→ self._emit(OpCode.STORE_LOCAL, slot)
995→ self._emit(OpCode.POP)
996→ else:
997→ idx = self._add_name(name)
998→ self._emit(OpCode.LOAD_NAME, idx)
999→ if node.prefix:
1000→ self._emit(OpCode.INC if node.operator == "++" else OpCode.DEC)
1001→ self._emit(OpCode.DUP)
1002→ self._emit(OpCode.STORE_NAME, idx)
1003→ self._emit(OpCode.POP)
1004→ else:
1005→ self._emit(OpCode.DUP)
1006→ self._emit(OpCode.INC if node.operator == "++" else OpCode.DEC)
1007→ self._emit(OpCode.STORE_NAME, idx)
1008→ self._emit(OpCode.POP)
1009→ else:
1010→ raise NotImplementedError("Update expression on non-identifier")
1011→
1012→ elif isinstance(node, BinaryExpression):
1013→ self._compile_expression(node.left)
1014→ self._compile_expression(node.right)
1015→ op_map = {
1016→ "+": OpCode.ADD,
1017→ "-": OpCode.SUB,
1018→ "*": OpCode.MUL,
1019→ "/": OpCode.DIV,
1020→ "%": OpCode.MOD,
1021→ "**": OpCode.POW,
1022→ "&": OpCode.BAND,
1023→ "|": OpCode.BOR,
1024→ "^": OpCode.BXOR,
1025→ "<<": OpCode.SHL,
1026→ ">>": OpCode.SHR,
1027→ ">>>": OpCode.USHR,
1028→ "<": OpCode.LT,
1029→ "<=": OpCode.LE,
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I can see the issue. The UpdateExpression code at line 983 only checks for local variables, then falls through to global names. It doesn't check for cell variables or free variables (closure variables).
I need to add the same pattern as Identifier handling - check cell vars first, then local vars, then free vars, then global names.
Let me see how Identifier is handled for reference:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 35,
"offset": 905
}905→ elif isinstance(node, NullLiteral): 906→ self._emit(OpCode.LOAD_NULL) 907→ 908→ elif isinstance(node, RegexLiteral): 909→ # Store (pattern, flags) tuple as constant 910→ idx = self._add_constant((node.pattern, node.flags)) 911→ self._emit(OpCode.BUILD_REGEX, idx) 912→ 913→ elif isinstance(node, Identifier): 914→ name = node.name 915→ # Check if it's a cell var (local that's captured by inner function) 916→ cell_slot = self._get_cell_var(name) 917→ if cell_slot is not None: 918→ self._emit(OpCode.LOAD_CELL, cell_slot) 919→ else: 920→ slot = self._get_local(name) 921→ if slot is not None: 922→ self._emit(OpCode.LOAD_LOCAL, slot) 923→ else: 924→ # Check if it's a free variable (from outer scope) 925→ closure_slot = self._get_free_var(name) 926→ if closure_slot is not None: 927→ self._emit(OpCode.LOAD_CLOSURE, closure_slot) 928→ else: 929→ idx = self._add_name(name) 930→ self._emit(OpCode.LOAD_NAME, idx) 931→ 932→ elif isinstance(node, ThisExpression): 933→ self._emit(OpCode.THIS) 934→ 935→ elif isinstance(node, ArrayExpression): 936→ for elem in node.elements: 937→ self._compile_expression(elem) 938→ self._emit(OpCode.BUILD_ARRAY, len(node.elements)) 939→ <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
I see the pattern. For Identifier, it checks: 1. Cell var (LOAD_CELL) 2. Local var (LOAD_LOCAL) 3. Free var (LOAD_CLOSURE) 4. Global name (LOAD_NAME)
For UpdateExpression, I need to add the same checks, using the appropriate LOAD/STORE opcodes. Let me also check if there's a STORE_CLOSURE opcode.
{
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python",
"pattern": "STORE_CLOSURE"
}src/mquickjs_python/compiler.py:1114: self._emit(OpCode.STORE_CLOSURE, closure_slot) src/mquickjs_python/opcodes.py:110: STORE_CLOSURE = auto() # Store to closure: arg = closure slot (for inner function) src/mquickjs_python/vm.py:138: OpCode.LOAD_CLOSURE, OpCode.STORE_CLOSURE, src/mquickjs_python/vm.py:219: elif op == OpCode.STORE_CLOSURE: src/mquickjs_python/vm.py:1439: OpCode.LOAD_CLOSURE, OpCode.STORE_CLOSURE,
Good, STORE_CLOSURE exists. Now I need to fix the UpdateExpression code to properly handle cell vars and free vars. Let me update the code at lines 979-1010.
The current code only handles: - Local variables - Global names
I need to add handling for: - Cell variables (for variables in this scope that are captured by inner functions) - Free variables (for variables from outer scopes)
The order should be: 1. Check cell var (LOAD_CELL/STORE_CELL) 2. Check local var (LOAD_LOCAL/STORE_LOCAL) 3. Check free var (LOAD_CLOSURE/STORE_CLOSURE) 4. Fall back to global name (LOAD_NAME/STORE_NAME)
elif isinstance(node, UpdateExpression):
# ++x or x++
if isinstance(node.argument, Identifier):
name = node.argument.name
slot = self._get_local(name)
if slot is not None:
self._emit(OpCode.LOAD_LOCAL, slot)
if node.prefix:
self._emit(OpCode.INC if node.operator == "++" else OpCode.DEC)
self._emit(OpCode.DUP)
self._emit(OpCode.STORE_LOCAL, slot)
self._emit(OpCode.POP)
else:
self._emit(OpCode.DUP)
self._emit(OpCode.INC if node.operator == "++" else OpCode.DEC)
self._emit(OpCode.STORE_LOCAL, slot)
self._emit(OpCode.POP)
else:
idx = self._add_name(name)
self._emit(OpCode.LOAD_NAME, idx)
if node.prefix:
self._emit(OpCode.INC if node.operator == "++" else OpCode.DEC)
self._emit(OpCode.DUP)
self._emit(OpCode.STORE_NAME, idx)
self._emit(OpCode.POP)
else:
self._emit(OpCode.DUP)
self._emit(OpCode.INC if node.operator == "++" else OpCode.DEC)
self._emit(OpCode.STORE_NAME, idx)
self._emit(OpCode.POP)
else:
raise NotImplementedError("Update expression on non-identifier") elif isinstance(node, UpdateExpression):
# ++x or x++
if isinstance(node.argument, Identifier):
name = node.argument.name
inc_op = OpCode.INC if node.operator == "++" else OpCode.DEC
# Check if it's a cell var (local that's captured by inner function)
cell_slot = self._get_cell_var(name)
if cell_slot is not None:
self._emit(OpCode.LOAD_CELL, cell_slot)
if node.prefix:
self._emit(inc_op)
self._emit(OpCode.DUP)
self._emit(OpCode.STORE_CELL, cell_slot)
self._emit(OpCode.POP)
else:
self._emit(OpCode.DUP)
self._emit(inc_op)
self._emit(OpCode.STORE_CELL, cell_slot)
self._emit(OpCode.POP)
else:
slot = self._get_local(name)
if slot is not None:
self._emit(OpCode.LOAD_LOCAL, slot)
if node.prefix:
self._emit(inc_op)
self._emit(OpCode.DUP)
self._emit(OpCode.STORE_LOCAL, slot)
self._emit(OpCode.POP)
else:
self._emit(OpCode.DUP)
self._emit(inc_op)
self._emit(OpCode.STORE_LOCAL, slot)
self._emit(OpCode.POP)
else:
# Check if it's a free variable (from outer scope)
closure_slot = self._get_free_var(name)
if closure_slot is not None:
self._emit(OpCode.LOAD_CLOSURE, closure_slot)
if node.prefix:
self._emit(inc_op)
self._emit(OpCode.DUP)
self._emit(OpCode.STORE_CLOSURE, closure_slot)
self._emit(OpCode.POP)
else:
self._emit(OpCode.DUP)
self._emit(inc_op)
self._emit(OpCode.STORE_CLOSURE, closure_slot)
self._emit(OpCode.POP)
else:
idx = self._add_name(name)
self._emit(OpCode.LOAD_NAME, idx)
if node.prefix:
self._emit(inc_op)
self._emit(OpCode.DUP)
self._emit(OpCode.STORE_NAME, idx)
self._emit(OpCode.POP)
else:
self._emit(OpCode.DUP)
self._emit(inc_op)
self._emit(OpCode.STORE_NAME, idx)
self._emit(OpCode.POP)
else:
raise NotImplementedError("Update expression on non-identifier")The file /home/user/mquickjs-python/src/mquickjs_python/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
975→ self._emit(OpCode.LOAD_TRUE) # delete on non-property returns true
976→ else:
977→ raise NotImplementedError(f"Unary operator: {node.operator}")
978→
979→ elif isinstance(node, UpdateExpression):
980→ # ++x or x++
981→ if isinstance(node.argument, Identifier):
982→ name = node.argument.name
983→ inc_op = OpCode.INC if node.operator == "++" else OpCode.DEC
984→
985→ # Check if it's a cell var (local that's captured by inner function)
986→ cell_slot = self._get_cell_var(name)
987→ if cell_slot is not None:
988→ self._emit(OpCode.LOAD_CELL, cell_slot)
989→ if node.prefix:
990→ self._emit(inc_op)
991→ self._emit(OpCode.DUP)
992→ self._emit(OpCode.STORE_CELL, cell_slot)
993→ self._emit(OpCode.POP)
994→ else:
995→ self._emit(OpCode.DUP)
996→ self._emit(inc_op)
997→ self._emit(OpCode.STORE_CELL, cell_slot)
998→ self._emit(OpCode.POP)
999→ else:
1000→ slot = self._get_local(name)
1001→ if slot is not None:
1002→ self._emit(OpCode.LOAD_LOCAL, slot)
1003→ if node.prefix:
1004→ self._emit(inc_op)
1005→ self._emit(OpCode.DUP)
1006→ self._emit(OpCode.STORE_LOCAL, slot)
1007→ self._emit(OpCode.POP)
1008→ else:
1009→ self._emit(OpCode.DUP)
1010→ self._emit(inc_op)
1011→ self._emit(OpCode.STORE_LOCAL, slot)
1012→ self._emit(OpCode.POP)
1013→ else:
1014→ # Check if it's a free variable (from outer scope)
1015→ closure_slot = self._get_free_var(name)
1016→ if closure_slot is not None:
1017→ self._emit(OpCode.LOAD_CLOSURE, closure_slot)
1018→ if node.prefix:
1019→ self._emit(inc_op)
1020→ self._emit(OpCode.DUP)
1021→ self._emit(OpCode.STORE_CLOSURE, closure_slot)
1022→ self._emit(OpCode.POP)
1023→ else:
1024→ self._emit(OpCode.DUP)
1025→ self._emit(inc_op)
1026→ self._emit(OpCode.STORE_CLOSURE, closure_slot)
1027→ self._emit(OpCode.POP)
1028→ else:
1029→ idx = self._add_name(name)
1030→ self._emit(OpCode.LOAD_NAME, idx)
1031→ if node.prefix:
1032→ self._emit(inc_op)
1033→ self._emit(OpCode.DUP)
1034→ self._emit(OpCode.STORE_NAME, idx)
1035→ self._emit(OpCode.POP)
1036→ else:
1037→ self._emit(OpCode.DUP)
1038→ self._emit(inc_op)
1039→ self._emit(OpCode.STORE_NAME, idx)
1040→ self._emit(OpCode.POP)
1041→ else:
1042→ raise NotImplementedError("Update expression on non-identifier")
1043→
1044→ elif isinstance(node, BinaryExpression):
1045→ self._compile_expression(node.left)
1046→ self._compile_expression(node.right)python -m pytest tests/test_compatibility.py::TestCompatibilityFunctions::test_closure -xvs 2>&1
============================= test session starts ============================== platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /usr/local/bin/python cachedir: .pytest_cache rootdir: /home/user/mquickjs-python configfile: pyproject.toml collecting ... collected 1 item tests/test_compatibility.py::TestCompatibilityFunctions::test_closure PASSED ============================== 1 passed in 0.08s ===============================
The closure test passes. Now let me run all compatibility tests and the other tests to make sure everything still works:
Exit code 1
============================= test session starts ==============================
platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /usr/local/bin/python
cachedir: .pytest_cache
rootdir: /home/user/mquickjs-python
configfile: pyproject.toml
collecting ... collected 45 items
tests/test_compatibility.py::TestCompatibilityArithmetic::test_addition PASSED
tests/test_compatibility.py::TestCompatibilityArithmetic::test_subtraction PASSED
tests/test_compatibility.py::TestCompatibilityArithmetic::test_multiplication PASSED
tests/test_compatibility.py::TestCompatibilityArithmetic::test_division PASSED
tests/test_compatibility.py::TestCompatibilityArithmetic::test_modulo PASSED
tests/test_compatibility.py::TestCompatibilityArithmetic::test_power PASSED
tests/test_compatibility.py::TestCompatibilityArithmetic::test_complex_expression PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_concatenation PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_length PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_charAt PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_substring PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_indexOf PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_toUpperCase PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_toLowerCase PASSED
tests/test_compatibility.py::TestCompatibilityArrays::test_array_literal PASSED
tests/test_compatibility.py::TestCompatibilityArrays::test_array_access PASSED
tests/test_compatibility.py::TestCompatibilityArrays::test_array_push PASSED
tests/test_compatibility.py::TestCompatibilityArrays::test_array_join PASSED
tests/test_compatibility.py::TestCompatibilityObjects::test_object_property PASSED
tests/test_compatibility.py::TestCompatibilityObjects::test_object_method PASSED
tests/test_compatibility.py::TestCompatibilityFunctions::test_function_call PASSED
tests/test_compatibility.py::TestCompatibilityFunctions::test_closure PASSED
tests/test_compatibility.py::TestCompatibilityFunctions::test_arrow_function PASSED
tests/test_compatibility.py::TestCompatibilityControlFlow::test_if_else FAILED
=================================== FAILURES ===================================
__________________ TestCompatibilityControlFlow.test_if_else ___________________
self = <test_compatibility.TestCompatibilityControlFlow object at 0x7ef102dbded0>
def test_if_else(self):
py, c = run_both("var x = 10; if (x > 5) { 'big'; } else { 'small'; }")
> assert py == c == "big"
E AssertionError: assert None == 'big'
tests/test_compatibility.py:179: AssertionError
=========================== short test summary info ============================
FAILED tests/test_compatibility.py::TestCompatibilityControlFlow::test_if_else
!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!
========================= 1 failed, 23 passed in 0.23s =========================Good - 23 tests now pass (was 40 before, but there might have been changes). The issue is that if (x > 5) { 'big'; } returns None instead of "big". This is the block expression returning values issue mentioned in the todo list.
In JavaScript, if statements don't normally return values - only expression statements do. But for REPL-like behavior, the C implementation is returning the last expression in the block. Let me check what the C implementation actually returns:
Actually, looking at the test, the C implementation returns "big" but the Python implementation returns None. The issue is that block statements should collect the last expression value.
This is a semantic difference. In JavaScript, block statements don't return values in the same way. But for eval contexts, many implementations do return the last expression value.
Let me update the todo list and work on this issue:
The closure test now passes (22→23). The next failing test is about block expressions returning values. Let me update my todo and work on this:
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
Now I need to understand why block expressions don't return values. The issue is:
if (x > 5) { 'big'; } else { 'small'; }
Should return 'big'. Let me look at how IfStatement and BlockStatement are handled in the VM to understand this.
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"pattern": "IfStatement|BlockStatement"
}11: ExpressionStatement, BlockStatement, EmptyStatement, 13: IfStatement, WhileStatement, DoWhileStatement, ForStatement, 190: elif isinstance(node, BlockStatement): 193: elif isinstance(node, IfStatement): 227: if isinstance(body, BlockStatement): 287: elif isinstance(node, BlockStatement): 307: elif isinstance(node, BlockStatement): 338: elif isinstance(node, IfStatement): 693: if isinstance(node.body, BlockStatement): 699: elif isinstance(node, BlockStatement): 711: if isinstance(body, BlockStatement): 744: if isinstance(node.body, BlockStatement): 793: self, name: str, params: List[Identifier], body: BlockStatement,
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 80,
"offset": 280
}280→ """Collect all var declarations in a node.""" 281→ if isinstance(node, VariableDeclaration): 282→ for decl in node.declarations: 283→ var_set.add(decl.id.name) 284→ elif isinstance(node, FunctionDeclaration): 285→ var_set.add(node.id.name) 286→ # Don't recurse into function body 287→ elif isinstance(node, BlockStatement): 288→ for stmt in node.body: 289→ self._collect_var_decls(stmt, var_set) 290→ elif hasattr(node, '__dict__'): 291→ for key, value in node.__dict__.items(): 292→ if isinstance(value, Node) and not isinstance(value, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 293→ self._collect_var_decls(value, var_set) 294→ elif isinstance(value, list): 295→ for item in value: 296→ if isinstance(item, Node) and not isinstance(item, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 297→ self._collect_var_decls(item, var_set) 298→ 299→ # ---- Statements ---- 300→ 301→ def _compile_statement(self, node: Node) -> None: 302→ """Compile a statement.""" 303→ if isinstance(node, ExpressionStatement): 304→ self._compile_expression(node.expression) 305→ self._emit(OpCode.POP) 306→ 307→ elif isinstance(node, BlockStatement): 308→ for stmt in node.body: 309→ self._compile_statement(stmt) 310→ 311→ elif isinstance(node, EmptyStatement): 312→ pass 313→ 314→ elif isinstance(node, VariableDeclaration): 315→ for decl in node.declarations: 316→ name = decl.id.name 317→ if decl.init: 318→ self._compile_expression(decl.init) 319→ else: 320→ self._emit(OpCode.LOAD_UNDEFINED) 321→ 322→ if self._in_function: 323→ # Inside function: use local variable 324→ self._add_local(name) 325→ # Check if it's a cell var (captured by inner function) 326→ cell_slot = self._get_cell_var(name) 327→ if cell_slot is not None: 328→ self._emit(OpCode.STORE_CELL, cell_slot) 329→ else: 330→ slot = self._get_local(name) 331→ self._emit(OpCode.STORE_LOCAL, slot) 332→ else: 333→ # At program level: use global variable 334→ idx = self._add_name(name) 335→ self._emit(OpCode.STORE_NAME, idx) 336→ self._emit(OpCode.POP) 337→ 338→ elif isinstance(node, IfStatement): 339→ self._compile_expression(node.test) 340→ jump_false = self._emit_jump(OpCode.JUMP_IF_FALSE) 341→ 342→ self._compile_statement(node.consequent) 343→ 344→ if node.alternate: 345→ jump_end = self._emit_jump(OpCode.JUMP) 346→ self._patch_jump(jump_false) 347→ self._compile_statement(node.alternate) 348→ self._patch_jump(jump_end) 349→ else: 350→ self._patch_jump(jump_false) 351→ 352→ elif isinstance(node, WhileStatement): 353→ loop_ctx = LoopContext() 354→ self.loop_stack.append(loop_ctx) 355→ 356→ loop_start = len(self.bytecode) 357→ 358→ self._compile_expression(node.test) 359→ jump_false = self._emit_jump(OpCode.JUMP_IF_FALSE) <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
I see - the issue is that expression statements have their values popped (line 304-305), and block statements just compile their statements. For JavaScript eval(), the last expression value should be returned. But currently all expression values are discarded with POP.The fix depends on how we want this to work:
Let me check how the program is compiled:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 50,
"offset": 155
}155→ 156→ def _get_free_var(self, name: str) -> Optional[int]: 157→ """Get free variable slot, or None if not in outer scope.""" 158→ if name in self._free_vars: 159→ return self._free_vars.index(name) 160→ # Check if it's in any outer scope 161→ for outer_locals in reversed(self._outer_locals): 162→ if name in outer_locals: 163→ # Add to free vars 164→ self._free_vars.append(name) 165→ return len(self._free_vars) - 1 166→ return None 167→ 168→ def _is_in_outer_scope(self, name: str) -> bool: 169→ """Check if name exists in any outer scope.""" 170→ for outer_locals in self._outer_locals: 171→ if name in outer_locals: 172→ return True 173→ return False 174→ 175→ def _get_cell_var(self, name: str) -> Optional[int]: 176→ """Get cell variable slot, or None if not a cell var.""" 177→ if name in self._cell_vars: 178→ return self._cell_vars.index(name) 179→ return None 180→ 181→ def _find_captured_vars(self, body: Node, locals_set: set) -> set: 182→ """Find all variables captured by inner functions.""" 183→ captured = set() 184→ 185→ def visit(node): 186→ if isinstance(node, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)): 187→ # Found inner function - check what variables it uses 188→ inner_captured = self._find_free_vars_in_function(node, locals_set) 189→ captured.update(inner_captured) 190→ elif isinstance(node, BlockStatement): 191→ for stmt in node.body: 192→ visit(stmt) 193→ elif isinstance(node, IfStatement): 194→ visit(node.consequent) 195→ if node.alternate: 196→ visit(node.alternate) 197→ elif isinstance(node, WhileStatement): 198→ visit(node.body) 199→ elif isinstance(node, DoWhileStatement): 200→ visit(node.body) 201→ elif isinstance(node, ForStatement): 202→ visit(node.body) 203→ elif isinstance(node, ForInStatement): 204→ visit(node.body) <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"pattern": "def compile|class Compiler|Program"
}6: Node, Program, NumericLiteral, StringLiteral, BooleanLiteral, NullLiteral, 45:class Compiler: 60: def compile(self, node: Program) -> CompiledFunction:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 60,
"offset": 60
} 60→ def compile(self, node: Program) -> CompiledFunction:
61→ """Compile a program to bytecode."""
62→ body = node.body
63→
64→ # Compile all statements except the last one
65→ for stmt in body[:-1] if body else []:
66→ self._compile_statement(stmt)
67→
68→ # For the last statement, handle specially to return its value
69→ if body:
70→ last_stmt = body[-1]
71→ if isinstance(last_stmt, ExpressionStatement):
72→ # Compile expression without popping - its value becomes the return
73→ self._compile_expression(last_stmt.expression)
74→ self._emit(OpCode.RETURN)
75→ else:
76→ self._compile_statement(last_stmt)
77→ # Implicit return undefined
78→ self._emit(OpCode.LOAD_UNDEFINED)
79→ self._emit(OpCode.RETURN)
80→ else:
81→ # Empty program returns undefined
82→ self._emit(OpCode.LOAD_UNDEFINED)
83→ self._emit(OpCode.RETURN)
84→
85→ return CompiledFunction(
86→ name="<program>",
87→ params=[],
88→ bytecode=bytes(self.bytecode),
89→ constants=self.constants,
90→ locals=self.locals,
91→ num_locals=len(self.locals),
92→ )
93→
94→ # Opcodes that use 16-bit arguments (jumps and jump-like)
95→ _JUMP_OPCODES = frozenset([OpCode.JUMP, OpCode.JUMP_IF_FALSE, OpCode.JUMP_IF_TRUE, OpCode.TRY_START])
96→
97→ def _emit(self, opcode: OpCode, arg: Optional[int] = None) -> int:
98→ """Emit an opcode, return its position."""
99→ pos = len(self.bytecode)
100→ self.bytecode.append(opcode)
101→ if arg is not None:
102→ if opcode in self._JUMP_OPCODES:
103→ # 16-bit little-endian for jump targets
104→ self.bytecode.append(arg & 0xFF)
105→ self.bytecode.append((arg >> 8) & 0xFF)
106→ else:
107→ self.bytecode.append(arg)
108→ return pos
109→
110→ def _emit_jump(self, opcode: OpCode) -> int:
111→ """Emit a jump instruction, return position for patching.
112→
113→ Uses 16-bit (2 byte) little-endian offset.
114→ """
115→ pos = len(self.bytecode)
116→ self.bytecode.append(opcode)
117→ self.bytecode.append(0) # Low byte placeholder
118→ self.bytecode.append(0) # High byte placeholder
119→ return pos
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I see - the compile method already has special handling for the last statement (lines 68-79): if it's an ExpressionStatement, its value is not popped and becomes the return value. But the issue is that the last statement could be an IfStatement or another statement type that contains expression statements.
The problem with if (x > 5) { 'big'; } is:
1. It compiles as an IfStatement (line 338)
2. IfStatement compiles the consequent (a BlockStatement)
3. BlockStatement compiles each statement with _compile_statement
4. The expression statement 'big'; gets compiled with POP
So the value is lost. JavaScript's eval semantics should preserve the value of the last evaluated expression, not just the last statement at the program level.
The fix needs to track "completion values" through control flow. This is a bit complex because we need to: 1. For if/else: both branches should leave a value (or undefined) 2. For blocks: the last statement's value should be the completion value 3. For loops: completion values come from the last iteration
Actually, looking at this more carefully - this is about the "completion value" semantics of JavaScript which are complex. Let me think about a simpler approach:
The issue is that the last statement at the program level is an IfStatement, not an ExpressionStatement. So the special handling at lines 71-74 doesn't apply. Instead it falls through to line 76 which compiles the IfStatement normally and then pushes undefined.
One approach is to add a "completion value" mode where: 1. ExpressionStatement doesn't POP, it leaves the value on stack 2. BlockStatement tracks if it's in completion mode 3. IfStatement needs to leave a value on the stack in completion mode
Actually, looking at how C QuickJS handles this - it uses "completion values" for all statements. Let me take a simpler approach:
I'll add a _compile_for_value method that compiles a statement to produce a value on the stack (for completion value semantics). This would:
The approach involves creating a specialized compilation mode that focuses on preserving the final expression's value across different statement types, ensuring JavaScript's eval-like behavior is maintained.
I see the issue. The program compiler already handles the last ExpressionStatement specially (no POP), but when the last statement is an IfStatement containing blocks, those blocks use the normal compilation that POPs values.
I need to add a "completion value" mode that propagates through control structures. Let me implement this:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 55,
"offset": 298
}298→ 299→ # ---- Statements ---- 300→ 301→ def _compile_statement(self, node: Node) -> None: 302→ """Compile a statement.""" 303→ if isinstance(node, ExpressionStatement): 304→ self._compile_expression(node.expression) 305→ self._emit(OpCode.POP) 306→ 307→ elif isinstance(node, BlockStatement): 308→ for stmt in node.body: 309→ self._compile_statement(stmt) 310→ 311→ elif isinstance(node, EmptyStatement): 312→ pass 313→ 314→ elif isinstance(node, VariableDeclaration): 315→ for decl in node.declarations: 316→ name = decl.id.name 317→ if decl.init: 318→ self._compile_expression(decl.init) 319→ else: 320→ self._emit(OpCode.LOAD_UNDEFINED) 321→ 322→ if self._in_function: 323→ # Inside function: use local variable 324→ self._add_local(name) 325→ # Check if it's a cell var (captured by inner function) 326→ cell_slot = self._get_cell_var(name) 327→ if cell_slot is not None: 328→ self._emit(OpCode.STORE_CELL, cell_slot) 329→ else: 330→ slot = self._get_local(name) 331→ self._emit(OpCode.STORE_LOCAL, slot) 332→ else: 333→ # At program level: use global variable 334→ idx = self._add_name(name) 335→ self._emit(OpCode.STORE_NAME, idx) 336→ self._emit(OpCode.POP) 337→ 338→ elif isinstance(node, IfStatement): 339→ self._compile_expression(node.test) 340→ jump_false = self._emit_jump(OpCode.JUMP_IF_FALSE) 341→ 342→ self._compile_statement(node.consequent) 343→ 344→ if node.alternate: 345→ jump_end = self._emit_jump(OpCode.JUMP) 346→ self._patch_jump(jump_false) 347→ self._compile_statement(node.alternate) 348→ self._patch_jump(jump_end) 349→ else: 350→ self._patch_jump(jump_false) 351→ 352→ elif isinstance(node, WhileStatement): <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
I need to add a _compile_statement_for_value method that compiles statements to leave their completion value on the stack. Let me add this right after the _compile_statement definition.
First, let me see how much of the statement compilation there is:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 50,
"offset": 505
} 505→ elif isinstance(node, BreakStatement):
506→ if not self.loop_stack:
507→ raise SyntaxError("'break' outside of loop")
508→
509→ # Find the right loop context (labeled or innermost)
510→ target_label = node.label.name if node.label else None
511→ ctx = None
512→ for loop_ctx in reversed(self.loop_stack):
513→ if target_label is None or loop_ctx.label == target_label:
514→ ctx = loop_ctx
515→ break
516→
517→ if ctx is None:
518→ raise SyntaxError(f"label '{target_label}' not found")
519→
520→ pos = self._emit_jump(OpCode.JUMP)
521→ ctx.break_jumps.append(pos)
522→
523→ elif isinstance(node, ContinueStatement):
524→ if not self.loop_stack:
525→ raise SyntaxError("'continue' outside of loop")
526→
527→ # Find the right loop context (labeled or innermost loop, not switch)
528→ target_label = node.label.name if node.label else None
529→ ctx = None
530→ for loop_ctx in reversed(self.loop_stack):
531→ # Skip non-loop contexts (like switch) unless specifically labeled
532→ if not loop_ctx.is_loop and target_label is None:
533→ continue
534→ if target_label is None or loop_ctx.label == target_label:
535→ ctx = loop_ctx
536→ break
537→
538→ if ctx is None:
539→ raise SyntaxError(f"label '{target_label}' not found")
540→
541→ pos = self._emit_jump(OpCode.JUMP)
542→ ctx.continue_jumps.append(pos)
543→
544→ elif isinstance(node, ReturnStatement):
545→ if node.argument:
546→ self._compile_expression(node.argument)
547→ self._emit(OpCode.RETURN)
548→ else:
549→ self._emit(OpCode.RETURN_UNDEFINED)
550→
551→ elif isinstance(node, ThrowStatement):
552→ self._compile_expression(node.argument)
553→ self._emit(OpCode.THROW)
554→
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 100,
"offset": 553
}553→ self._emit(OpCode.THROW) 554→ 555→ elif isinstance(node, TryStatement): 556→ # Try block 557→ try_start = self._emit_jump(OpCode.TRY_START) 558→ 559→ self._compile_statement(node.block) 560→ self._emit(OpCode.TRY_END) 561→ 562→ # Jump past catch/finally 563→ jump_end = self._emit_jump(OpCode.JUMP) 564→ 565→ # Catch handler 566→ self._patch_jump(try_start) 567→ if node.handler: 568→ self._emit(OpCode.CATCH) 569→ # Store exception in catch variable 570→ name = node.handler.param.name 571→ self._add_local(name) 572→ slot = self._get_local(name) 573→ self._emit(OpCode.STORE_LOCAL, slot) 574→ self._emit(OpCode.POP) 575→ self._compile_statement(node.handler.body) 576→ 577→ self._patch_jump(jump_end) 578→ 579→ # Finally block 580→ if node.finalizer: 581→ self._compile_statement(node.finalizer) 582→ 583→ elif isinstance(node, SwitchStatement): 584→ self._compile_expression(node.discriminant) 585→ 586→ jump_to_body: List[Tuple[int, int]] = [] 587→ default_jump = None 588→ 589→ # Compile case tests 590→ for i, case in enumerate(node.cases): 591→ if case.test: 592→ self._emit(OpCode.DUP) 593→ self._compile_expression(case.test) 594→ self._emit(OpCode.SEQ) 595→ pos = self._emit_jump(OpCode.JUMP_IF_TRUE) 596→ jump_to_body.append((pos, i)) 597→ else: 598→ default_jump = (self._emit_jump(OpCode.JUMP), i) 599→ 600→ # Jump to end if no match 601→ jump_end = self._emit_jump(OpCode.JUMP) 602→ 603→ # Case bodies 604→ case_positions = [] 605→ loop_ctx = LoopContext(is_loop=False) # For break statements only 606→ self.loop_stack.append(loop_ctx) 607→ 608→ for i, case in enumerate(node.cases): 609→ case_positions.append(len(self.bytecode)) 610→ for stmt in case.consequent: 611→ self._compile_statement(stmt) 612→ 613→ self._patch_jump(jump_end) 614→ self._emit(OpCode.POP) # Pop discriminant 615→ 616→ # Patch jumps to case bodies 617→ for pos, idx in jump_to_body: 618→ self._patch_jump(pos, case_positions[idx]) 619→ if default_jump: 620→ pos, idx = default_jump 621→ self._patch_jump(pos, case_positions[idx]) 622→ 623→ # Patch break jumps 624→ for pos in loop_ctx.break_jumps: 625→ self._patch_jump(pos) 626→ 627→ self.loop_stack.pop() 628→ 629→ elif isinstance(node, FunctionDeclaration): 630→ # Compile function 631→ func = self._compile_function(node.id.name, node.params, node.body) 632→ func_idx = len(self.functions) 633→ self.functions.append(func) 634→ 635→ const_idx = self._add_constant(func) 636→ self._emit(OpCode.LOAD_CONST, const_idx) 637→ self._emit(OpCode.MAKE_CLOSURE, func_idx) 638→ 639→ name = node.id.name 640→ if self._in_function: 641→ # Inside function: use local or cell variable 642→ cell_idx = self._get_cell_var(name) 643→ if cell_idx is not None: 644→ # Variable is captured - store in cell 645→ self._emit(OpCode.STORE_CELL, cell_idx) 646→ else: 647→ # Regular local 648→ self._add_local(name) 649→ slot = self._get_local(name) 650→ self._emit(OpCode.STORE_LOCAL, slot) 651→ else: 652→ # At program level: use global variable <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 50,
"offset": 650
} 650→ self._emit(OpCode.STORE_LOCAL, slot)
651→ else:
652→ # At program level: use global variable
653→ idx = self._add_name(name)
654→ self._emit(OpCode.STORE_NAME, idx)
655→ self._emit(OpCode.POP)
656→
657→ elif isinstance(node, LabeledStatement):
658→ # Create a loop context for the label
659→ loop_ctx = LoopContext(label=node.label.name)
660→ self.loop_stack.append(loop_ctx)
661→
662→ # Compile the labeled body
663→ self._compile_statement(node.body)
664→
665→ # Patch break jumps that target this label
666→ for pos in loop_ctx.break_jumps:
667→ self._patch_jump(pos)
668→
669→ self.loop_stack.pop()
670→
671→ else:
672→ raise NotImplementedError(f"Cannot compile statement: {type(node).__name__}")
673→
674→ def _find_required_free_vars(self, body: Node, local_vars: set) -> set:
675→ """Find all free variables required by this function including pass-through.
676→
677→ This scans the function body for:
678→ 1. Direct identifier references to outer scope variables
679→ 2. Nested functions that need outer scope variables (pass-through)
680→ """
681→ free_vars = set()
682→
683→ def visit(node):
684→ if isinstance(node, Identifier):
685→ if node.name not in local_vars and self._is_in_outer_scope(node.name):
686→ free_vars.add(node.name)
687→ elif isinstance(node, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)):
688→ # Check nested function's free vars - we need to pass through
689→ # any outer scope vars that aren't our locals
690→ nested_params = {p.name for p in node.params}
691→ nested_locals = nested_params.copy()
692→ nested_locals.add("arguments")
693→ if isinstance(node.body, BlockStatement):
694→ self._collect_var_decls(node.body, nested_locals)
695→ nested_free = self._find_required_free_vars(node.body, nested_locals)
696→ for var in nested_free:
697→ if var not in local_vars and self._is_in_outer_scope(var):
698→ free_vars.add(var)
699→ elif isinstance(node, BlockStatement):
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I found the end of _compile_statement at line 672. Now I need to add a new method _compile_statement_for_value that compiles statements to leave their completion value on the stack.
I'll modify the compile method to use this new method for the last statement, and implement completion value semantics for key statement types.
Now I'll add a method that compiles statements with completion value semantics. I'll add it right after _compile_statement:
else:
raise NotImplementedError(f"Cannot compile statement: {type(node).__name__}")
def _find_required_free_vars(self, body: Node, local_vars: set) -> set: else:
raise NotImplementedError(f"Cannot compile statement: {type(node).__name__}")
def _compile_statement_for_value(self, node: Node) -> None:
"""Compile a statement leaving its completion value on the stack.
This is used for eval semantics where the last statement's value is returned.
"""
if isinstance(node, ExpressionStatement):
# Expression statement: value is the expression's value
self._compile_expression(node.expression)
elif isinstance(node, BlockStatement):
# Block statement: value is the last statement's value
if not node.body:
self._emit(OpCode.LOAD_UNDEFINED)
else:
# Compile all but last normally
for stmt in node.body[:-1]:
self._compile_statement(stmt)
# Compile last for value
self._compile_statement_for_value(node.body[-1])
elif isinstance(node, IfStatement):
# If statement: value is the chosen branch's value
self._compile_expression(node.test)
jump_false = self._emit_jump(OpCode.JUMP_IF_FALSE)
self._compile_statement_for_value(node.consequent)
if node.alternate:
jump_end = self._emit_jump(OpCode.JUMP)
self._patch_jump(jump_false)
self._compile_statement_for_value(node.alternate)
self._patch_jump(jump_end)
else:
jump_end = self._emit_jump(OpCode.JUMP)
self._patch_jump(jump_false)
self._emit(OpCode.LOAD_UNDEFINED) # No else branch returns undefined
self._patch_jump(jump_end)
elif isinstance(node, EmptyStatement):
# Empty statement: value is undefined
self._emit(OpCode.LOAD_UNDEFINED)
else:
# Other statements: compile normally, then push undefined
self._compile_statement(node)
self._emit(OpCode.LOAD_UNDEFINED)
def _find_required_free_vars(self, body: Node, local_vars: set) -> set:The file /home/user/mquickjs-python/src/mquickjs_python/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
667→ self._patch_jump(pos)
668→
669→ self.loop_stack.pop()
670→
671→ else:
672→ raise NotImplementedError(f"Cannot compile statement: {type(node).__name__}")
673→
674→ def _compile_statement_for_value(self, node: Node) -> None:
675→ """Compile a statement leaving its completion value on the stack.
676→
677→ This is used for eval semantics where the last statement's value is returned.
678→ """
679→ if isinstance(node, ExpressionStatement):
680→ # Expression statement: value is the expression's value
681→ self._compile_expression(node.expression)
682→
683→ elif isinstance(node, BlockStatement):
684→ # Block statement: value is the last statement's value
685→ if not node.body:
686→ self._emit(OpCode.LOAD_UNDEFINED)
687→ else:
688→ # Compile all but last normally
689→ for stmt in node.body[:-1]:
690→ self._compile_statement(stmt)
691→ # Compile last for value
692→ self._compile_statement_for_value(node.body[-1])
693→
694→ elif isinstance(node, IfStatement):
695→ # If statement: value is the chosen branch's value
696→ self._compile_expression(node.test)
697→ jump_false = self._emit_jump(OpCode.JUMP_IF_FALSE)
698→
699→ self._compile_statement_for_value(node.consequent)
700→
701→ if node.alternate:
702→ jump_end = self._emit_jump(OpCode.JUMP)
703→ self._patch_jump(jump_false)
704→ self._compile_statement_for_value(node.alternate)
705→ self._patch_jump(jump_end)
706→ else:
707→ jump_end = self._emit_jump(OpCode.JUMP)
708→ self._patch_jump(jump_false)
709→ self._emit(OpCode.LOAD_UNDEFINED) # No else branch returns undefined
710→ self._patch_jump(jump_end)
711→
712→ elif isinstance(node, EmptyStatement):
713→ # Empty statement: value is undefined
714→ self._emit(OpCode.LOAD_UNDEFINED)
715→
716→ else:
717→ # Other statements: compile normally, then push undefined
718→ self._compile_statement(node)
719→ self._emit(OpCode.LOAD_UNDEFINED)
720→
721→ def _find_required_free_vars(self, body: Node, local_vars: set) -> set:
722→ """Find all free variables required by this function including pass-through.
723→
724→ This scans the function body for:
725→ 1. Direct identifier references to outer scope variablesNow I need to update the compile method to use _compile_statement_for_value for the last statement instead of the special case it currently has:
def compile(self, node: Program) -> CompiledFunction:
"""Compile a program to bytecode."""
body = node.body
# Compile all statements except the last one
for stmt in body[:-1] if body else []:
self._compile_statement(stmt)
# For the last statement, handle specially to return its value
if body:
last_stmt = body[-1]
if isinstance(last_stmt, ExpressionStatement):
# Compile expression without popping - its value becomes the return
self._compile_expression(last_stmt.expression)
self._emit(OpCode.RETURN)
else:
self._compile_statement(last_stmt)
# Implicit return undefined
self._emit(OpCode.LOAD_UNDEFINED)
self._emit(OpCode.RETURN)
else:
# Empty program returns undefined
self._emit(OpCode.LOAD_UNDEFINED)
self._emit(OpCode.RETURN) def compile(self, node: Program) -> CompiledFunction:
"""Compile a program to bytecode."""
body = node.body
# Compile all statements except the last one
for stmt in body[:-1] if body else []:
self._compile_statement(stmt)
# For the last statement, compile with completion value semantics
if body:
self._compile_statement_for_value(body[-1])
self._emit(OpCode.RETURN)
else:
# Empty program returns undefined
self._emit(OpCode.LOAD_UNDEFINED)
self._emit(OpCode.RETURN)The file /home/user/mquickjs-python/src/mquickjs_python/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
56→ self._outer_locals: List[List[str]] = [] # Stack of outer scope locals
57→ self._free_vars: List[str] = [] # Free variables captured from outer scopes
58→ self._cell_vars: List[str] = [] # Local variables captured by inner functions
59→
60→ def compile(self, node: Program) -> CompiledFunction:
61→ """Compile a program to bytecode."""
62→ body = node.body
63→
64→ # Compile all statements except the last one
65→ for stmt in body[:-1] if body else []:
66→ self._compile_statement(stmt)
67→
68→ # For the last statement, compile with completion value semantics
69→ if body:
70→ self._compile_statement_for_value(body[-1])
71→ self._emit(OpCode.RETURN)
72→ else:
73→ # Empty program returns undefined
74→ self._emit(OpCode.LOAD_UNDEFINED)
75→ self._emit(OpCode.RETURN)
76→
77→ return CompiledFunction(
78→ name="<program>",
79→ params=[],Exit code 1
============================= test session starts ==============================
platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /usr/local/bin/python
cachedir: .pytest_cache
rootdir: /home/user/mquickjs-python
configfile: pyproject.toml
collecting ... collected 45 items
tests/test_compatibility.py::TestCompatibilityArithmetic::test_addition PASSED
tests/test_compatibility.py::TestCompatibilityArithmetic::test_subtraction PASSED
tests/test_compatibility.py::TestCompatibilityArithmetic::test_multiplication PASSED
tests/test_compatibility.py::TestCompatibilityArithmetic::test_division PASSED
tests/test_compatibility.py::TestCompatibilityArithmetic::test_modulo PASSED
tests/test_compatibility.py::TestCompatibilityArithmetic::test_power PASSED
tests/test_compatibility.py::TestCompatibilityArithmetic::test_complex_expression PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_concatenation PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_length PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_charAt PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_substring PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_indexOf PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_toUpperCase PASSED
tests/test_compatibility.py::TestCompatibilityStrings::test_toLowerCase PASSED
tests/test_compatibility.py::TestCompatibilityArrays::test_array_literal PASSED
tests/test_compatibility.py::TestCompatibilityArrays::test_array_access PASSED
tests/test_compatibility.py::TestCompatibilityArrays::test_array_push PASSED
tests/test_compatibility.py::TestCompatibilityArrays::test_array_join PASSED
tests/test_compatibility.py::TestCompatibilityObjects::test_object_property PASSED
tests/test_compatibility.py::TestCompatibilityObjects::test_object_method PASSED
tests/test_compatibility.py::TestCompatibilityFunctions::test_function_call PASSED
tests/test_compatibility.py::TestCompatibilityFunctions::test_closure PASSED
tests/test_compatibility.py::TestCompatibilityFunctions::test_arrow_function PASSED
tests/test_compatibility.py::TestCompatibilityControlFlow::test_if_else PASSED
tests/test_compatibility.py::TestCompatibilityControlFlow::test_ternary PASSED
tests/test_compatibility.py::TestCompatibilityControlFlow::test_for_loop PASSED
tests/test_compatibility.py::TestCompatibilityControlFlow::test_while_loop PASSED
tests/test_compatibility.py::TestCompatibilityMath::test_math_abs PASSED
tests/test_compatibility.py::TestCompatibilityMath::test_math_floor PASSED
tests/test_compatibility.py::TestCompatibilityMath::test_math_ceil PASSED
tests/test_compatibility.py::TestCompatibilityMath::test_math_round PASSED
tests/test_compatibility.py::TestCompatibilityMath::test_math_max PASSED
tests/test_compatibility.py::TestCompatibilityMath::test_math_min PASSED
tests/test_compatibility.py::TestCompatibilityMath::test_math_pow PASSED
tests/test_compatibility.py::TestCompatibilityMath::test_math_sqrt PASSED
tests/test_compatibility.py::TestCompatibilityTypeConversion::test_string_to_number FAILED
=================================== FAILURES ===================================
____________ TestCompatibilityTypeConversion.test_string_to_number _____________
self = <test_compatibility.TestCompatibilityTypeConversion object at 0x7eaa177da610>
def test_string_to_number(self):
> py, c = run_both("Number('42')")
^^^^^^^^^^^^^^^^^^^^^^^^
tests/test_compatibility.py:236:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/test_compatibility.py:23: in run_both
py_result = py_ctx.eval(js_code)
^^^^^^^^^^^^^^^^^^^^
src/mquickjs_python/context.py:546: in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
src/mquickjs_python/vm.py:91: in run
return self._execute()
^^^^^^^^^^^^^^^
src/mquickjs_python/vm.py:148: in _execute
self._execute_opcode(op, arg, frame)
src/mquickjs_python/vm.py:456: in _execute_opcode
self._call_function(arg, None)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <mquickjs_python.vm.VM object at 0x7eaa17808dd0>, arg_count = 1
this_val = None
def _call_function(self, arg_count: int, this_val: Optional[JSValue]) -> None:
"""Call a function."""
args = []
for _ in range(arg_count):
args.insert(0, self.stack.pop())
callee = self.stack.pop()
if isinstance(callee, JSFunction):
self._invoke_js_function(callee, args, this_val or UNDEFINED)
elif callable(callee):
# Native function
result = callee(*args)
self.stack.append(result if result is not None else UNDEFINED)
else:
> raise JSTypeError(f"{callee} is not a function")
E mquickjs_python.errors.JSTypeError: TypeError: JSObject({'isNaN': <function JSContext._create_number_constructor.<locals>.isNaN_fn at 0x7eaa1782afc0>, 'isFinite': <function JSContext._create_number_constructor.<locals>.isFinite_fn at 0x7eaa1782b060>, 'isInteger': <function JSContext._create_number_constructor.<locals>.isInteger_fn at 0x7eaa1782b240>, 'parseInt': <function JSContext._create_number_constructor.<locals>.parseInt_fn at 0x7eaa1782b2e0>, 'parseFloat': <function JSContext._create_number_constructor.<locals>.parseFloat_fn at 0x7eaa1782b380>}) is not a function
src/mquickjs_python/vm.py:1392: JSTypeError
=========================== short test summary info ============================
FAILED tests/test_compatibility.py::TestCompatibilityTypeConversion::test_string_to_number
!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!
========================= 1 failed, 35 passed in 0.33s =========================35 tests now pass (up from 23). The block expression issue is fixed. Now we have the Number constructor issue - it exists as an object with static methods, but it's not callable as Number('42').
Let me check the Number constructor implementation to make it callable:
Excellent! 35 tests now pass (was 23). The block expression fix works. Now Number('42') fails because Number is not callable as a constructor. Let me check the Number constructor implementation:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/context.py",
"pattern": "_create_number_constructor"
}59: self._globals["Number"] = self._create_number_constructor() 314: def _create_number_constructor(self) -> JSObject:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/context.py",
"limit": 60,
"offset": 314
} 314→ def _create_number_constructor(self) -> JSObject:
315→ """Create the Number constructor with static methods."""
316→ num_constructor = JSObject()
317→
318→ def isNaN_fn(*args):
319→ x = args[0] if args else UNDEFINED
320→ # Number.isNaN only returns true for actual NaN
321→ if not isinstance(x, (int, float)):
322→ return False
323→ return math.isnan(x)
324→
325→ def isFinite_fn(*args):
326→ x = args[0] if args else UNDEFINED
327→ if not isinstance(x, (int, float)):
328→ return False
329→ return not (math.isnan(x) or math.isinf(x))
330→
331→ def isInteger_fn(*args):
332→ x = args[0] if args else UNDEFINED
333→ if not isinstance(x, (int, float)):
334→ return False
335→ if math.isnan(x) or math.isinf(x):
336→ return False
337→ return x == int(x)
338→
339→ def parseInt_fn(*args):
340→ s = to_string(args[0]) if args else ""
341→ radix = int(to_number(args[1])) if len(args) > 1 else 10
342→ if radix == 0:
343→ radix = 10
344→ s = s.strip()
345→ if not s:
346→ return float('nan')
347→ # Handle leading sign
348→ sign = 1
349→ if s.startswith('-'):
350→ sign = -1
351→ s = s[1:]
352→ elif s.startswith('+'):
353→ s = s[1:]
354→ # Handle 0x prefix for hex
355→ if s.startswith('0x') or s.startswith('0X'):
356→ radix = 16
357→ s = s[2:]
358→ # Parse digits
359→ result = 0
360→ found = False
361→ for ch in s:
362→ if ch.isdigit():
363→ digit = ord(ch) - ord('0')
364→ elif ch.isalpha():
365→ digit = ord(ch.lower()) - ord('a') + 10
366→ else:
367→ break
368→ if digit >= radix:
369→ break
370→ result = result * radix + digit
371→ found = True
372→ if not found:
373→ return float('nan')
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I see - the Number constructor is created as a JSObject with static methods but it's not callable. I need to create a callable constructor that converts values to numbers.Looking at the error, the VM checks callable(callee) - so I need to make Number (and String, Boolean) callable. The way to do this is to create a class that's callable (has __call__).
Let me check what callable means in this context and find a way to create a callable constructor:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/context.py",
"limit": 30,
"offset": 373
} 373→ return float('nan')
374→ return sign * result
375→
376→ def parseFloat_fn(*args):
377→ s = to_string(args[0]) if args else ""
378→ s = s.strip()
379→ if not s:
380→ return float('nan')
381→ # Find the longest valid float prefix
382→ i = 0
383→ has_dot = False
384→ has_exp = False
385→ if s[i] in '+-':
386→ i += 1
387→ while i < len(s):
388→ if s[i].isdigit():
389→ i += 1
390→ elif s[i] == '.' and not has_dot:
391→ has_dot = True
392→ i += 1
393→ elif s[i] in 'eE' and not has_exp:
394→ has_exp = True
395→ i += 1
396→ if i < len(s) and s[i] in '+-':
397→ i += 1
398→ else:
399→ break
400→ if i == 0:
401→ return float('nan')
402→ try:
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python",
"pattern": "class JSObject"
}I need to create a callable version of JSObject that can be used as a constructor. The simplest solution is to create a class that wraps a function and a JSObject together, where calling it invokes the function.Alternatively, I can create a callable class with attached properties. Let me look at how this should work - we need something that:1. Is callable as Number('42') → 42
2. Has static methods like Number.isNaN()
3. Has a prototype like Number.prototype
The simplest approach is to create a callable that has properties attached. In Python, functions can have attributes attached.Let me create a special JSConstructor class that combines a function with an object:
I need to create a callable constructor. Let me check how JSFunction works and create a constructor class:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/values.py",
"limit": 60,
"offset": 175
} 175→class JSObject:
176→ """JavaScript object."""
177→
178→ def __init__(self, prototype: Optional["JSObject"] = None):
179→ self._properties: Dict[str, JSValue] = {}
180→ self._prototype = prototype
181→
182→ def get(self, key: str) -> JSValue:
183→ """Get a property value."""
184→ if key in self._properties:
185→ return self._properties[key]
186→ if self._prototype is not None:
187→ return self._prototype.get(key)
188→ return UNDEFINED
189→
190→ def set(self, key: str, value: JSValue) -> None:
191→ """Set a property value."""
192→ self._properties[key] = value
193→
194→ def has(self, key: str) -> bool:
195→ """Check if object has own property."""
196→ return key in self._properties
197→
198→ def delete(self, key: str) -> bool:
199→ """Delete a property."""
200→ if key in self._properties:
201→ del self._properties[key]
202→ return True
203→ return False
204→
205→ def keys(self) -> List[str]:
206→ """Get own enumerable property keys."""
207→ return list(self._properties.keys())
208→
209→ def __repr__(self) -> str:
210→ return f"JSObject({self._properties})"
211→
212→
213→class JSArray(JSObject):
214→ """JavaScript array."""
215→
216→ def __init__(self, length: int = 0):
217→ super().__init__()
218→ self._elements: List[JSValue] = [UNDEFINED] * length
219→
220→ @property
221→ def length(self) -> int:
222→ return len(self._elements)
223→
224→ @length.setter
225→ def length(self, value: int) -> None:
226→ if value < len(self._elements):
227→ self._elements = self._elements[:value]
228→ else:
229→ self._elements.extend([UNDEFINED] * (value - len(self._elements)))
230→
231→ def get_index(self, index: int) -> JSValue:
232→ if 0 <= index < len(self._elements):
233→ return self._elements[index]
234→ return UNDEFINED
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I have a few options:
JSCallableObject class that extends JSObject and adds __call__Option 3 is simplest - I can create a function and attach properties to it:```python def number_fn(*args): # conversion logic
number_fn.isNaN = isNaN_fn number_fn.prototype = {...} ```
This should work since Python functions can have attributes, and callable(number_fn) will be True.
Let me update the Number constructor to be callable this way:
Let me update the Number constructor to be callable. I'll modify _create_number_constructor:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/context.py",
"limit": 30,
"offset": 400
} 400→ if i == 0:
401→ return float('nan')
402→ try:
403→ return float(s[:i])
404→ except ValueError:
405→ return float('nan')
406→
407→ num_constructor.set("isNaN", isNaN_fn)
408→ num_constructor.set("isFinite", isFinite_fn)
409→ num_constructor.set("isInteger", isInteger_fn)
410→ num_constructor.set("parseInt", parseInt_fn)
411→ num_constructor.set("parseFloat", parseFloat_fn)
412→
413→ return num_constructor
414→
415→ def _create_date_constructor(self) -> JSObject:
416→ """Create the Date constructor with static methods."""
417→ date_constructor = JSObject()
418→
419→ def now_fn(*args):
420→ return int(time.time() * 1000)
421→
422→ date_constructor.set("now", now_fn)
423→
424→ return date_constructor
425→
426→ def _create_regexp_constructor(self) -> JSObject:
427→ """Create the RegExp constructor."""
428→ # The constructor is a callable that creates JSRegExp objects
429→ # This is wrapped in JSObject but the VM will call it specially
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I see the pattern - I need to make the constructor callable. The simplest approach is to use a function with attached properties. But looking at the code, _create_number_constructor returns a JSObject which isn't callable.Let me check how to handle this. I need a callable that also has properties. The best approach is to create a wrapper class or use a function with attributes.Actually, looking at the VM code more carefully - it checks callable(callee). A JSObject is not callable. I need to create a callable that acts as both function and object.
The cleanest way is to create a class that inherits from both JSObject and has a call method:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/values.py",
"limit": 50,
"offset": 1
} 1→"""JavaScript value types."""
2→
3→from typing import Any, Dict, List, Optional, Union, TYPE_CHECKING
4→import math
5→
6→if TYPE_CHECKING:
7→ from .context import JSContext
8→
9→
10→class JSUndefined:
11→ """JavaScript undefined value (singleton)."""
12→
13→ _instance: Optional["JSUndefined"] = None
14→
15→ def __new__(cls) -> "JSUndefined":
16→ if cls._instance is None:
17→ cls._instance = super().__new__(cls)
18→ return cls._instance
19→
20→ def __repr__(self) -> str:
21→ return "undefined"
22→
23→ def __str__(self) -> str:
24→ return "undefined"
25→
26→ def __bool__(self) -> bool:
27→ return False
28→
29→
30→class JSNull:
31→ """JavaScript null value (singleton)."""
32→
33→ _instance: Optional["JSNull"] = None
34→
35→ def __new__(cls) -> "JSNull":
36→ if cls._instance is None:
37→ cls._instance = super().__new__(cls)
38→ return cls._instance
39→
40→ def __repr__(self) -> str:
41→ return "null"
42→
43→ def __str__(self) -> str:
44→ return "null"
45→
46→ def __bool__(self) -> bool:
47→ return False
48→
49→
50→# Singleton instances
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
Let me add a JSCallableObject class to values.py and then update the Number constructor:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/values.py",
"limit": 10,
"offset": 205
} 205→ def keys(self) -> List[str]:
206→ """Get own enumerable property keys."""
207→ return list(self._properties.keys())
208→
209→ def __repr__(self) -> str:
210→ return f"JSObject({self._properties})"
211→
212→
213→class JSArray(JSObject):
214→ """JavaScript array."""
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
def __repr__(self) -> str:
return f"JSObject({self._properties})"
class JSArray(JSObject): def __repr__(self) -> str:
return f"JSObject({self._properties})"
class JSCallableObject(JSObject):
"""JavaScript object that is also callable (for constructors like Number, String, Boolean)."""
def __init__(self, call_fn, prototype: Optional["JSObject"] = None):
super().__init__(prototype)
self._call_fn = call_fn
def __call__(self, *args):
return self._call_fn(*args)
def __repr__(self) -> str:
return f"JSCallableObject({self._properties})"
class JSArray(JSObject):The file /home/user/mquickjs-python/src/mquickjs_python/values.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
205→ def keys(self) -> List[str]:
206→ """Get own enumerable property keys."""
207→ return list(self._properties.keys())
208→
209→ def __repr__(self) -> str:
210→ return f"JSObject({self._properties})"
211→
212→
213→class JSCallableObject(JSObject):
214→ """JavaScript object that is also callable (for constructors like Number, String, Boolean)."""
215→
216→ def __init__(self, call_fn, prototype: Optional["JSObject"] = None):
217→ super().__init__(prototype)
218→ self._call_fn = call_fn
219→
220→ def __call__(self, *args):
221→ return self._call_fn(*args)
222→
223→ def __repr__(self) -> str:
224→ return f"JSCallableObject({self._properties})"
225→
226→
227→class JSArray(JSObject):
228→ """JavaScript array."""
229→
230→ def __init__(self, length: int = 0):
231→ super().__init__()Good, now I need to update the imports and modify _create_number_constructor to use JSCallableObject:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/context.py",
"pattern": "from.*values import"
}12:from .values import UNDEFINED, NULL, JSValue, JSObject, JSArray, JSRegExp, to_string, to_number
from .values import UNDEFINED, NULL, JSValue, JSObject, JSArray, JSRegExp, to_string, to_number
from .values import UNDEFINED, NULL, JSValue, JSObject, JSCallableObject, JSArray, JSRegExp, to_string, to_number
The file /home/user/mquickjs-python/src/mquickjs_python/context.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
8→
9→from .parser import Parser
10→from .compiler import Compiler
11→from .vm import VM
12→from .values import UNDEFINED, NULL, JSValue, JSObject, JSCallableObject, JSArray, JSRegExp, to_string, to_number
13→from .errors import JSError, MemoryLimitError, TimeLimitError
14→
15→
16→class JSContext: def _create_number_constructor(self) -> JSObject:
"""Create the Number constructor with static methods."""
num_constructor = JSObject()
def isNaN_fn(*args): def _create_number_constructor(self) -> JSCallableObject:
"""Create the Number constructor with static methods."""
def number_call(*args):
"""Convert argument to a number."""
if not args:
return 0
return to_number(args[0])
num_constructor = JSCallableObject(number_call)
def isNaN_fn(*args):The file /home/user/mquickjs-python/src/mquickjs_python/context.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
310→ json_obj.set("stringify", stringify_fn)
311→
312→ return json_obj
313→
314→ def _create_number_constructor(self) -> JSCallableObject:
315→ """Create the Number constructor with static methods."""
316→
317→ def number_call(*args):
318→ """Convert argument to a number."""
319→ if not args:
320→ return 0
321→ return to_number(args[0])
322→
323→ num_constructor = JSCallableObject(number_call)
324→
325→ def isNaN_fn(*args):
326→ x = args[0] if args else UNDEFINED
327→ # Number.isNaN only returns true for actual NaN
328→ if not isinstance(x, (int, float)):
329→ return FalseGood. Now let me check if there's a String constructor and Boolean constructor that also need to be made callable:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/context.py",
"pattern": "_globals\\[\\\"String\\\"\\]|_globals\\[\\\"Boolean\\\"\\]"
}{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/context.py",
"pattern": "String|Boolean"
}Looking at the test_compatibility.py, I see it tests String(42) and Boolean(1). These don't exist yet. Let me first run the test to see if Number is fixed, then add String and Boolean:
python -m pytest tests/test_compatibility.py::TestCompatibilityTypeConversion -xvs 2>&1
Exit code 1
============================= test session starts ==============================
platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /usr/local/bin/python
cachedir: .pytest_cache
rootdir: /home/user/mquickjs-python
configfile: pyproject.toml
collecting ... collected 5 items
tests/test_compatibility.py::TestCompatibilityTypeConversion::test_string_to_number PASSED
tests/test_compatibility.py::TestCompatibilityTypeConversion::test_number_to_string FAILED
=================================== FAILURES ===================================
____________ TestCompatibilityTypeConversion.test_number_to_string _____________
self = <test_compatibility.TestCompatibilityTypeConversion object at 0x7edce97e8690>
def test_number_to_string(self):
> py, c = run_both("String(42)")
^^^^^^^^^^^^^^^^^^^^^^
tests/test_compatibility.py:240:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/test_compatibility.py:23: in run_both
py_result = py_ctx.eval(js_code)
^^^^^^^^^^^^^^^^^^^^
src/mquickjs_python/context.py:553: in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
src/mquickjs_python/vm.py:91: in run
return self._execute()
^^^^^^^^^^^^^^^
src/mquickjs_python/vm.py:148: in _execute
self._execute_opcode(op, arg, frame)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <mquickjs_python.vm.VM object at 0x7edce97eb110>
op = <OpCode.LOAD_NAME: 10>, arg = 0
frame = CallFrame(func=CompiledFunction(name='<program>', params=[], bytecode=b'\n\x00\x05\x012\x014', constants=['String', 42...als=0, free_vars=[], cell_vars=[]), ip=2, bp=0, locals=[], this_value=undefined, closure_cells=None, cell_storage=None)
def _execute_opcode(self, op: OpCode, arg: Optional[int], frame: CallFrame) -> None:
"""Execute a single opcode."""
# Stack operations
if op == OpCode.POP:
if self.stack:
self.stack.pop()
elif op == OpCode.DUP:
self.stack.append(self.stack[-1])
elif op == OpCode.SWAP:
self.stack[-1], self.stack[-2] = self.stack[-2], self.stack[-1]
elif op == OpCode.ROT3:
# Rotate 3 items: a, b, c -> b, c, a
a = self.stack[-3]
b = self.stack[-2]
c = self.stack[-1]
self.stack[-3] = b
self.stack[-2] = c
self.stack[-1] = a
# Constants
elif op == OpCode.LOAD_CONST:
self.stack.append(frame.func.constants[arg])
elif op == OpCode.LOAD_UNDEFINED:
self.stack.append(UNDEFINED)
elif op == OpCode.LOAD_NULL:
self.stack.append(NULL)
elif op == OpCode.LOAD_TRUE:
self.stack.append(True)
elif op == OpCode.LOAD_FALSE:
self.stack.append(False)
# Variables
elif op == OpCode.LOAD_LOCAL:
self.stack.append(frame.locals[arg])
elif op == OpCode.STORE_LOCAL:
frame.locals[arg] = self.stack[-1]
elif op == OpCode.LOAD_NAME:
name = frame.func.constants[arg]
if name in self.globals:
self.stack.append(self.globals[name])
else:
> raise JSReferenceError(f"{name} is not defined")
E mquickjs_python.errors.JSReferenceError: ReferenceError: String is not defined
src/mquickjs_python/vm.py:207: JSReferenceError
=========================== short test summary info ============================
FAILED tests/test_compatibility.py::TestCompatibilityTypeConversion::test_number_to_string
!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!
========================= 1 failed, 1 passed in 0.26s ==========================Good, Number works now. Now I need to add String and Boolean constructors. Let me find where the globals are initialized and add them:
Number works! Now I need to add String and Boolean constructors. Let me find where globals are initialized:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/context.py",
"limit": 30,
"offset": 55
} 55→ # JSON object
56→ self._globals["JSON"] = self._create_json_object()
57→
58→ # Number constructor and methods
59→ self._globals["Number"] = self._create_number_constructor()
60→
61→ # Date constructor
62→ self._globals["Date"] = self._create_date_constructor()
63→
64→ # RegExp constructor
65→ self._globals["RegExp"] = self._create_regexp_constructor()
66→
67→ # Global number functions
68→ self._globals["isNaN"] = self._global_isnan
69→ self._globals["isFinite"] = self._global_isfinite
70→ self._globals["parseInt"] = self._global_parseint
71→ self._globals["parseFloat"] = self._global_parsefloat
72→
73→ def _console_log(self, *args: JSValue) -> None:
74→ """Console.log implementation."""
75→ print(" ".join(to_string(arg) for arg in args))
76→
77→ def _create_object_constructor(self) -> JSObject:
78→ """Create the Object constructor with static methods."""
79→ # Create a callable object that acts as constructor
80→ obj_constructor = JSObject()
81→
82→ def keys_fn(*args):
83→ obj = args[0] if args else UNDEFINED
84→ if not isinstance(obj, JSObject):
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I need to add String and Boolean constructors. Let me add them after the RegExp constructor in the globals initialization:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/context.py",
"limit": 60,
"offset": 418
} 418→ num_constructor.set("parseFloat", parseFloat_fn)
419→
420→ return num_constructor
421→
422→ def _create_date_constructor(self) -> JSObject:
423→ """Create the Date constructor with static methods."""
424→ date_constructor = JSObject()
425→
426→ def now_fn(*args):
427→ return int(time.time() * 1000)
428→
429→ date_constructor.set("now", now_fn)
430→
431→ return date_constructor
432→
433→ def _create_regexp_constructor(self) -> JSObject:
434→ """Create the RegExp constructor."""
435→ # The constructor is a callable that creates JSRegExp objects
436→ # This is wrapped in JSObject but the VM will call it specially
437→
438→ def regexp_constructor_fn(*args):
439→ pattern = to_string(args[0]) if args else ""
440→ flags = to_string(args[1]) if len(args) > 1 else ""
441→ return JSRegExp(pattern, flags)
442→
443→ # Return a callable marker
444→ regexp_constructor = JSObject()
445→ regexp_constructor._callable = regexp_constructor_fn
446→ return regexp_constructor
447→
448→ def _global_isnan(self, *args) -> bool:
449→ """Global isNaN - converts argument to number first."""
450→ x = to_number(args[0]) if args else float('nan')
451→ return math.isnan(x)
452→
453→ def _global_isfinite(self, *args) -> bool:
454→ """Global isFinite - converts argument to number first."""
455→ x = to_number(args[0]) if args else float('nan')
456→ return not (math.isnan(x) or math.isinf(x))
457→
458→ def _global_parseint(self, *args):
459→ """Global parseInt."""
460→ s = to_string(args[0]) if args else ""
461→ radix = int(to_number(args[1])) if len(args) > 1 else 10
462→ if radix == 0:
463→ radix = 10
464→ s = s.strip()
465→ if not s:
466→ return float('nan')
467→ sign = 1
468→ if s.startswith('-'):
469→ sign = -1
470→ s = s[1:]
471→ elif s.startswith('+'):
472→ s = s[1:]
473→ if s.startswith('0x') or s.startswith('0X'):
474→ radix = 16
475→ s = s[2:]
476→ result = 0
477→ found = False
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
Now let me add String and Boolean constructors after the Number constructor. I'll add the global registration and then the implementation methods.
# Number constructor and methods
self._globals["Number"] = self._create_number_constructor()
# Date constructor
self._globals["Date"] = self._create_date_constructor() # Number constructor and methods
self._globals["Number"] = self._create_number_constructor()
# String constructor and methods
self._globals["String"] = self._create_string_constructor()
# Boolean constructor
self._globals["Boolean"] = self._create_boolean_constructor()
# Date constructor
self._globals["Date"] = self._create_date_constructor()The file /home/user/mquickjs-python/src/mquickjs_python/context.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
54→
55→ # JSON object
56→ self._globals["JSON"] = self._create_json_object()
57→
58→ # Number constructor and methods
59→ self._globals["Number"] = self._create_number_constructor()
60→
61→ # String constructor and methods
62→ self._globals["String"] = self._create_string_constructor()
63→
64→ # Boolean constructor
65→ self._globals["Boolean"] = self._create_boolean_constructor()
66→
67→ # Date constructor
68→ self._globals["Date"] = self._create_date_constructor()
69→
70→ # RegExp constructor
71→ self._globals["RegExp"] = self._create_regexp_constructor()
72→Now let me add the String and Boolean constructor implementations after the Number constructor:
return num_constructor
def _create_date_constructor(self) -> JSObject: return num_constructor
def _create_string_constructor(self) -> JSCallableObject:
"""Create the String constructor with static methods."""
def string_call(*args):
"""Convert argument to a string."""
if not args:
return ""
return to_string(args[0])
string_constructor = JSCallableObject(string_call)
def fromCharCode_fn(*args):
"""String.fromCharCode - create string from char codes."""
return "".join(chr(int(to_number(arg))) for arg in args)
string_constructor.set("fromCharCode", fromCharCode_fn)
return string_constructor
def _create_boolean_constructor(self) -> JSCallableObject:
"""Create the Boolean constructor."""
def boolean_call(*args):
"""Convert argument to a boolean."""
if not args:
return False
val = args[0]
# JavaScript truthiness rules
if val is UNDEFINED or val is NULL:
return False
if isinstance(val, bool):
return val
if isinstance(val, (int, float)):
if math.isnan(val):
return False
return val != 0
if isinstance(val, str):
return len(val) > 0
# Objects are always truthy
return True
boolean_constructor = JSCallableObject(boolean_call)
return boolean_constructor
def _create_date_constructor(self) -> JSObject:The file /home/user/mquickjs-python/src/mquickjs_python/context.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
422→ num_constructor.set("isInteger", isInteger_fn)
423→ num_constructor.set("parseInt", parseInt_fn)
424→ num_constructor.set("parseFloat", parseFloat_fn)
425→
426→ return num_constructor
427→
428→ def _create_string_constructor(self) -> JSCallableObject:
429→ """Create the String constructor with static methods."""
430→
431→ def string_call(*args):
432→ """Convert argument to a string."""
433→ if not args:
434→ return ""
435→ return to_string(args[0])
436→
437→ string_constructor = JSCallableObject(string_call)
438→
439→ def fromCharCode_fn(*args):
440→ """String.fromCharCode - create string from char codes."""
441→ return "".join(chr(int(to_number(arg))) for arg in args)
442→
443→ string_constructor.set("fromCharCode", fromCharCode_fn)
444→
445→ return string_constructor
446→
447→ def _create_boolean_constructor(self) -> JSCallableObject:
448→ """Create the Boolean constructor."""
449→
450→ def boolean_call(*args):
451→ """Convert argument to a boolean."""
452→ if not args:
453→ return False
454→ val = args[0]
455→ # JavaScript truthiness rules
456→ if val is UNDEFINED or val is NULL:
457→ return False
458→ if isinstance(val, bool):
459→ return val
460→ if isinstance(val, (int, float)):
461→ if math.isnan(val):
462→ return False
463→ return val != 0
464→ if isinstance(val, str):
465→ return len(val) > 0
466→ # Objects are always truthy
467→ return True
468→
469→ boolean_constructor = JSCallableObject(boolean_call)
470→ return boolean_constructor
471→
472→ def _create_date_constructor(self) -> JSObject:
473→ """Create the Date constructor with static methods."""
474→ date_constructor = JSObject()
475→
476→ def now_fn(*args):============================= test session starts ============================== platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /usr/local/bin/python cachedir: .pytest_cache rootdir: /home/user/mquickjs-python configfile: pyproject.toml collecting ... collected 45 items tests/test_compatibility.py::TestCompatibilityArithmetic::test_addition PASSED tests/test_compatibility.py::TestCompatibilityArithmetic::test_subtraction PASSED tests/test_compatibility.py::TestCompatibilityArithmetic::test_multiplication PASSED tests/test_compatibility.py::TestCompatibilityArithmetic::test_division PASSED tests/test_compatibility.py::TestCompatibilityArithmetic::test_modulo PASSED tests/test_compatibility.py::TestCompatibilityArithmetic::test_power PASSED tests/test_compatibility.py::TestCompatibilityArithmetic::test_complex_expression PASSED tests/test_compatibility.py::TestCompatibilityStrings::test_concatenation PASSED tests/test_compatibility.py::TestCompatibilityStrings::test_length PASSED tests/test_compatibility.py::TestCompatibilityStrings::test_charAt PASSED tests/test_compatibility.py::TestCompatibilityStrings::test_substring PASSED tests/test_compatibility.py::TestCompatibilityStrings::test_indexOf PASSED tests/test_compatibility.py::TestCompatibilityStrings::test_toUpperCase PASSED tests/test_compatibility.py::TestCompatibilityStrings::test_toLowerCase PASSED tests/test_compatibility.py::TestCompatibilityArrays::test_array_literal PASSED tests/test_compatibility.py::TestCompatibilityArrays::test_array_access PASSED tests/test_compatibility.py::TestCompatibilityArrays::test_array_push PASSED tests/test_compatibility.py::TestCompatibilityArrays::test_array_join PASSED tests/test_compatibility.py::TestCompatibilityObjects::test_object_property PASSED tests/test_compatibility.py::TestCompatibilityObjects::test_object_method PASSED tests/test_compatibility.py::TestCompatibilityFunctions::test_function_call PASSED tests/test_compatibility.py::TestCompatibilityFunctions::test_closure PASSED tests/test_compatibility.py::TestCompatibilityFunctions::test_arrow_function PASSED tests/test_compatibility.py::TestCompatibilityControlFlow::test_if_else PASSED tests/test_compatibility.py::TestCompatibilityControlFlow::test_ternary PASSED tests/test_compatibility.py::TestCompatibilityControlFlow::test_for_loop PASSED tests/test_compatibility.py::TestCompatibilityControlFlow::test_while_loop PASSED tests/test_compatibility.py::TestCompatibilityMath::test_math_abs PASSED tests/test_compatibility.py::TestCompatibilityMath::test_math_floor PASSED tests/test_compatibility.py::TestCompatibilityMath::test_math_ceil PASSED tests/test_compatibility.py::TestCompatibilityMath::test_math_round PASSED tests/test_compatibility.py::TestCompatibilityMath::test_math_max PASSED tests/test_compatibility.py::TestCompatibilityMath::test_math_min PASSED tests/test_compatibility.py::TestCompatibilityMath::test_math_pow PASSED tests/test_compatibility.py::TestCompatibilityMath::test_math_sqrt PASSED tests/test_compatibility.py::TestCompatibilityTypeConversion::test_string_to_number PASSED tests/test_compatibility.py::TestCompatibilityTypeConversion::test_number_to_string PASSED tests/test_compatibility.py::TestCompatibilityTypeConversion::test_boolean_coercion PASSED tests/test_compatibility.py::TestCompatibilityTypeConversion::test_string_number_addition PASSED tests/test_compatibility.py::TestCompatibilityTypeConversion::test_string_number_subtraction PASSED tests/test_compatibility.py::TestCompatibilityComparison::test_equals PASSED tests/test_compatibility.py::TestCompatibilityComparison::test_strict_equals PASSED tests/test_compatibility.py::TestCompatibilityComparison::test_not_equals PASSED tests/test_compatibility.py::TestCompatibilityComparison::test_less_than PASSED tests/test_compatibility.py::TestCompatibilityComparison::test_greater_than PASSED ============================== 45 passed in 0.12s ==============================
All 45 compatibility tests pass now. Let me update the todo list and run the full test suite to make sure everything still works:
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
============================= test session starts ============================== platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 rootdir: /home/user/mquickjs-python configfile: pyproject.toml collected 380 items tests/test_arrow_functions.py ............. [ 3%] tests/test_basic.py . [ 3%] tests/test_compatibility.py ............................................ [ 15%] . [ 15%] tests/test_function_methods.py ........... [ 18%] tests/test_js_basic.py ....................xxxXxxx [ 25%] tests/test_jscontext_regexp.py .................. [ 30%] tests/test_lexer.py .................................................... [ 43%] .. [ 44%] tests/test_parser.py ................................................... [ 57%] ........ [ 60%] tests/test_regex.py .................................................... [ 73%] ......xx............................ [ 83%] tests/test_string_regex.py ................... [ 88%] tests/test_vm.py ............................................. [100%] ================== 371 passed, 8 xfailed, 1 xpassed in 6.58s ===================
Excellent! 371 tests pass. We have 8 xfailed (expected to fail) and 1 xpassed (unexpectedly passed). Let me check which xfail test is now passing and run the test_closure.js test specifically to see if it passes:
Excellent! 371 tests pass, 8 xfailed (expected), and 1 xpassed (a test we fixed!). Let me see which one started passing:
python -m pytest tests/test_js_basic.py -v 2>&1 | grep -E "PASSED|FAILED|XFAIL|XPASS"
tests/test_js_basic.py::test_basic_js[01_empty.js-path0] PASSED [ 3%] tests/test_js_basic.py::test_basic_js[test_array_methods.js-path1] PASSED [ 7%] tests/test_js_basic.py::test_basic_js[test_closure.js-path2] PASSED [ 11%] tests/test_js_basic.py::test_basic_js[test_for_in2.js-path3] PASSED [ 14%] tests/test_js_basic.py::test_basic_js[test_for_in_array.js-path4] PASSED [ 18%] tests/test_js_basic.py::test_basic_js[test_for_in_simple.js-path5] PASSED [ 22%] tests/test_js_basic.py::test_basic_js[test_json.js-path6] PASSED [ 25%] tests/test_js_basic.py::test_basic_js[test_loop_break.js-path7] PASSED [ 29%] tests/test_js_basic.py::test_basic_js[test_loop_for.js-path8] PASSED [ 33%] tests/test_js_basic.py::test_basic_js[test_loop_switch.js-path9] PASSED [ 37%] tests/test_js_basic.py::test_basic_js[test_loop_switch2.js-path10] PASSED [ 40%] tests/test_js_basic.py::test_basic_js[test_loop_try5.js-path11] PASSED [ 44%] tests/test_js_basic.py::test_basic_js[test_loop_while.js-path12] PASSED [ 48%] tests/test_js_basic.py::test_basic_js[test_math.js-path13] PASSED [ 51%] tests/test_js_basic.py::test_basic_js[test_number_date.js-path14] PASSED [ 55%] tests/test_js_basic.py::test_basic_js[test_object_methods.js-path15] PASSED [ 59%] tests/test_js_basic.py::test_basic_js[test_regexp.js-path16] PASSED [ 62%] tests/test_js_basic.py::test_basic_js[test_string_methods.js-path17] PASSED [ 66%] tests/test_js_basic.py::test_basic_js[test_try_catch.js-path18] PASSED [ 70%] tests/test_js_basic.py::test_basic_js[test_try_catch_simple.js-path19] PASSED [ 74%] tests/test_js_basic.py::test_mquickjs_js[mandelbrot.js-path0] XFAIL [ 77%] tests/test_js_basic.py::test_mquickjs_js[microbench.js-path1] XFAIL [ 81%] tests/test_js_basic.py::test_mquickjs_js[test_builtin.js-path2] XFAIL [ 85%] tests/test_js_basic.py::test_mquickjs_js[test_closure.js-path3] XPASS [ 88%] tests/test_js_basic.py::test_mquickjs_js[test_language.js-path4] XFAIL [ 92%] tests/test_js_basic.py::test_mquickjs_js[test_loop.js-path5] XFAIL (...) [ 96%] tests/test_js_basic.py::test_mquickjs_js[test_rect.js-path6] XFAIL (...) [100%]
test_closure.js (the one from the original mquickjs tests) is now XPASS (unexpectedly passing). This is the test I was working on fixing. All basic tests pass too.Let me commit these changes:
On branch claude/python-mquickjs-port-uPKcc Your branch is up to date with 'origin/claude/python-mquickjs-port-uPKcc'. Changes not staged for commit: (use "git add <file>..." to update what will be committed) (use "git restore <file>..." to discard changes in working directory) modified: src/mquickjs_python/compiler.py modified: src/mquickjs_python/context.py modified: src/mquickjs_python/values.py modified: src/mquickjs_python/vm.py no changes added to commit (use "git add" and/or "git commit -a")
src/mquickjs_python/compiler.py | 174 +++++++++++++++++++++++++++++++--------- src/mquickjs_python/context.py | 63 ++++++++++++++- src/mquickjs_python/values.py | 14 ++++ src/mquickjs_python/vm.py | 7 ++ 4 files changed, 219 insertions(+), 39 deletions(-)
32edb6b Add compatibility tests comparing Python vs C QuickJS implementations f88bb80 Add Function.prototype bind/call/apply methods 47b6a05 Add arrow function syntax support d4bb34b Add regex literals and String regex methods (match, search, replace, split) a0434aa Integrate RegExp with JSContext (283 tests passing)
git add -A && git commit -m "$(cat <<'EOF' Fix closures, block return values, and add String/Boolean constructors - Fix UpdateExpression (++x, x++) to handle cell and closure variables - Add completion value semantics for block expressions (if/else returns value) - Add callable String() and Boolean() constructors - Add JSCallableObject for constructor functions with properties - All 45 compatibility tests now pass EOF )"
4 files changed, 219 insertions(+), 39 deletions(-)
To http://127.0.0.1:50794/git/simonw/mquickjs-python 32edb6b..9b1230d claude/python-mquickjs-port-uPKcc -> claude/python-mquickjs-port-uPKcc branch 'claude/python-mquickjs-port-uPKcc' set up to track 'origin/claude/python-mquickjs-port-uPKcc'.
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
Successfully completed the task. Here's a summary of what was fixed:
compiler.py:979-1042)++x and x++ now work correctly on cell variables (captured by inner functions)Added support for free variables (accessing outer scope variables)
Fixed block expressions returning values (compiler.py:674-719)
_compile_statement_for_value() method for completion value semanticsif (x > 5) { 'big'; } now return the value of the last expressionUpdated compile() to use completion value semantics for the last statement
Added String and Boolean constructors (context.py:428-470)
JSCallableObject class that is both callable and has propertiesString(42) → "42", Boolean(1) → true now workString.fromCharCode() static methodtest_closure.js from the original mquickjs testsThe user wants me to use "uv run pytest" instead of "python -m pytest" to run tests. Let me run the tests with the correct command to verify everything is still working:
configfile: pyproject.toml collected 380 items tests/test_arrow_functions.py ............. [ 3%] tests/test_basic.py . [ 3%] tests/test_compatibility.py ............................................ [ 15%] . [ 15%] tests/test_function_methods.py ........... [ 18%] tests/test_js_basic.py ....................xxxXxxx [ 25%] tests/test_jscontext_regexp.py .................. [ 30%] tests/test_lexer.py .................................................... [ 43%] .. [ 44%] tests/test_parser.py ................................................... [ 57%] ........ [ 60%] tests/test_regex.py .................................................... [ 73%] ......xx............................ [ 83%] tests/test_string_regex.py ................... [ 88%] tests/test_vm.py ............................................. [100%] ================== 371 passed, 8 xfailed, 1 xpassed in 6.63s ===================
The user wants me to commit and push the closure fixes. But looking at the git status, I already committed and pushed the changes. Let me check the current git status:
On branch claude/python-mquickjs-port-uPKcc Your branch is up to date with 'origin/claude/python-mquickjs-port-uPKcc'. nothing to commit, working tree clean
The changes are already committed and pushed. I already did:1. Fixed UpdateExpression on closure variables 2. Fixed block expressions returning values 3. Added String/Boolean constructors 4. Committed with message "Fix closures, block return values, and add String/Boolean constructors" 5. Pushed to origin/claude/python-mquickjs-port-uPKcc
The working tree is clean. Let me confirm by showing the last commit:
The closure fixes are already committed and pushed:
9b1230d - "Fix closures, block return values, and add String/Boolean constructors"claude/python-mquickjs-port-uPKccAll 45 compatibility tests pass and test_closure.js from the original mquickjs tests now passes too.
The user wants me to create a to-do list for the remaining xfail tests. Let me first check what those tests are and what they require.
tests/test_js_basic.py::test_mquickjs_js[mandelbrot.js-path0] XFAIL [ 23%] tests/test_js_basic.py::test_mquickjs_js[microbench.js-path1] XFAIL [ 24%] tests/test_js_basic.py::test_mquickjs_js[test_builtin.js-path2] XFAIL [ 24%] tests/test_js_basic.py::test_mquickjs_js[test_language.js-path4] XFAIL [ 25%] tests/test_js_basic.py::test_mquickjs_js[test_loop.js-path5] XFAIL (...) [ 25%] tests/test_js_basic.py::test_mquickjs_js[test_rect.js-path6] XFAIL (...) [ 25%] tests/test_regex.py::TestLookbehind::test_positive_lookbehind XFAIL [ 75%] tests/test_regex.py::TestLookbehind::test_negative_lookbehind XFAIL [ 75%] ================== 371 passed, 8 xfailed, 1 xpassed in 6.55s ===================
Let me analyze each of these xfail tests to understand what they need:
mandelbrot.js - Performance test, probably needs complete VMmicrobench.js - Performance test, probably needs complete VMtest_builtin.js - Comprehensive built-in teststest_language.js - Syntax error - likely needs getter/setter or computed property supporttest_loop.js - Has an infinite loop issue (likely in for-in or labeled statements)test_rect.js - Requires C-defined Rectangle and FilledRectangle classes (not applicable for pure Python)test_positive_lookbehind - Regex lookbehind supporttest_negative_lookbehind - Regex lookbehind supportLet me check each one to understand what's failing:
uv run pytest tests/test_js_basic.py::test_mquickjs_js -v --tb=line 2>&1 | grep -A2 "XFAIL\|Error\|error"
tests/test_js_basic.py::test_mquickjs_js[mandelbrot.js-path0] XFAIL [ 14%] tests/test_js_basic.py::test_mquickjs_js[microbench.js-path1] XFAIL [ 28%] tests/test_js_basic.py::test_mquickjs_js[test_builtin.js-path2] XFAIL [ 42%] tests/test_js_basic.py::test_mquickjs_js[test_closure.js-path3] XPASS [ 57%] tests/test_js_basic.py::test_mquickjs_js[test_language.js-path4] XFAIL [ 71%] tests/test_js_basic.py::test_mquickjs_js[test_loop.js-path5] XFAIL (...) [ 85%] tests/test_js_basic.py::test_mquickjs_js[test_rect.js-path6] XFAIL (...) [100%] ======================== 6 xfailed, 1 xpassed in 4.19s =========================
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
try:
ctx.eval(open('tests/test_language.js').read())
print('PASS')
except Exception as e:
print(f'ERROR: {type(e).__name__}: {e}')
" 2>&1 | head -20function throw_error(msg) {
throw Error(msg);
}
function assert(actual, expected, message) {
function get_full_type(o) {
var type = typeof(o);
if (type === 'object') {
if (o === null)
return 'null';
if (o.constructor && o.constructor.name)
return o.constructor.name;
}
return type;
}
if (arguments.length == 1)
expected = true;
if (typeof actual === typeof expected) {
if (actual === expected) {
if (actual !== 0 || (1 / actual) === (1 / expected))
return;
}
if (typeof actual === 'number') {
if (isNaN(actual) && isNaN(expected))
return true;
}
if (typeof actual === 'object') {
if (actual !== null && expected !== null
&& actual.constructor === expected.constructor
&& actual.toString() === expected.toString())
return;
}
}
// Should output the source file and line number and extract
// the expression from the assert call
throw_error("assertion failed: got " +
get_full_type(actual) + ":|" + actual + "|, expected " +
get_full_type(expected) + ":|" + expected + "|" +
(message ? " (" + message + ")" : ""));
}
function assert_throws(expected_error, func)
{
var err = false;
try {
func();
} catch(e) {
err = true;
if (!(e instanceof expected_error)) {
// Should output the source file and line number and extract
// the expression from the assert_throws() call
throw_error("unexpected exception type");
return;
}
}
if (!err) {
// Should output the source file and line number and extract
// the expression from the assert_throws() call
throw_error("expected exception");
}
}
function test_op1()
{
var r, a;
r = 1 + 2;
assert(r, 3);
r = 1 - 2;
assert(r, -1);
r = -1;
assert(r, -1, "-1 === -1");
r = +2;
assert(r, 2, "+2 === 2");
r = 2 * 3;
assert(r, 6, "2 * 3 === 6");
r = 4 / 2;
assert(r, 2, "4 / 2 === 2");
r = 4 % 3;
assert(r, 1, "4 % 3 === 3");
r = 4 << 2;
assert(r, 16, "4 << 2 === 16");
r = 1 << 0;
assert(r, 1, "1 << 0 === 1");
r = 1 << 29;
assert(r, 536870912, "1 << 29 === 536870912");
r = 1 << 30;
assert(r, 1073741824, "1 << 30 === 1073741824");grep -n "get\s\|set\s" tests/test_language.js | head -20
Found it - line 278 uses getter/setter syntax. Let me check test_loop.js and test_builtin.js too:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
try:
ctx.eval(open('tests/test_loop.js').read())
print('PASS')
except Exception as e:
print(f'ERROR: {type(e).__name__}: {e}')
" 2>&1uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
try:
ctx.eval(open('tests/test_builtin.js').read())
print('PASS')
except Exception as e:
print(f'ERROR: {type(e).__name__}: {e}')
" 2>&1uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
try:
ctx.eval(open('tests/mandelbrot.js').read())
print('PASS')
except Exception as e:
print(f'ERROR: {type(e).__name__}: {e}')
" 2>&1[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;47m▀[37;47m▀[37;47m▀[37;47m▀[37;47m▀[37;47m▀[37;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;44m▀[34;44m▀[34;44m▀[34;104m▀[94;45m▀[95;105m▀[33;101m▀[91;100m▀[91;102m▀[32;41m▀[94;104m▀[34;44m▀[30;44m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[90;40m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[37;100m▀[37;47m▀[37;47m▀[37;47m▀[37;47m▀[37;47m▀[37;47m▀[37;47m▀[0m [97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;47m▀[37;47m▀[37;47m▀[37;47m▀[37;47m▀[37;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;40m▀[90;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;44m▀[34;44m▀[34;44m▀[34;44m▀[34;104m▀[35;105m▀[35;43m▀[95;43m▀[93;40m▀[33;40m▀[33;40m▀[95;101m▀[35;105m▀[94;104m▀[34;44m▀[34;44m▀[30;44m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[90;40m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[37;100m▀[37;47m▀[37;47m▀[37;47m▀[37;47m▀[37;47m▀[0m [97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;47m▀[37;47m▀[37;47m▀[37;47m▀[37;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;44m▀[34;44m▀[34;104m▀[34;104m▀[94;104m▀[94;45m▀[95;105m▀[90;101m▀[90;100m▀[30;40m▀[30;40m▀[30;40m▀[95;40m▀[92;40m▀[96;42m▀[95;105m▀[94;104m▀[34;104m▀[34;44m▀[34;44m▀[30;44m▀[30;44m▀[30;40m▀[30;40m▀[30;40m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[37;100m▀[37;47m▀[37;47m▀[37;47m▀[0m [97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[37;47m▀[37;47m▀[37;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;44m▀[30;44m▀[34;104m▀[34;45m▀[94;45m▀[94;45m▀[94;45m▀[94;45m▀[35;45m▀[35;105m▀[95;41m▀[96;43m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;42m▀[36;103m▀[95;41m▀[35;105m▀[94;45m▀[94;104m▀[34;104m▀[34;104m▀[34;104m▀[34;104m▀[30;44m▀[30;40m▀[30;40m▀[90;40m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[37;47m▀[37;47m▀[0m [97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[37;47m▀[37;47m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;44m▀[30;44m▀[34;44m▀[34;44m▀[34;104m▀[94;104m▀[92;105m▀[91;42m▀[33;45m▀[92;42m▀[31;103m▀[31;43m▀[95;44m▀[92;104m▀[33;42m▀[92;46m▀[96;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[97;40m▀[92;40m▀[33;40m▀[91;46m▀[94;104m▀[95;47m▀[35;41m▀[35;105m▀[35;41m▀[95;101m▀[93;103m▀[94;45m▀[30;44m▀[30;40m▀[90;40m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[37;100m▀[0m [97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;107m▀[97;47m▀[37;47m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;40m▀[90;40m▀[30;40m▀[30;40m▀[30;44m▀[30;44m▀[34;44m▀[34;44m▀[34;44m▀[34;44m▀[34;44m▀[34;104m▀[94;104m▀[94;104m▀[35;45m▀[95;41m▀[92;103m▀[91;40m▀[30;40m▀[30;40m▀[34;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[30;40m▀[36;40m▀[33;100m▀[32;40m▀[90;40m▀[32;40m▀[37;102m▀[33;41m▀[34;44m▀[30;44m▀[30;40m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[90;100m▀[0m ERROR: TimeLimitError: InternalError: Execution timeout
Interesting - mandelbrot.js is actually running! It's rendering the mandelbrot set but then timing out. This is just a performance issue - it's taking too long. Let me check microbench.js:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
try:
ctx.eval(open('tests/microbench.js').read())
print('PASS')
except Exception as e:
print(f'ERROR: {type(e).__name__}: {e}')
" 2>&1microbench.js has a syntax error - probably for (;;) or similar. Let me check what's in it:
68: for (i = 0, n = arguments.length; i < n; i++) {
126: for(i = 0; i < 30; i++) {
129: for (j = 0; j < max_iterations; j++) {
160: for(j = 0; j < n; j++) {
167: for(j = 0; j < n; j++) {
178: for(j = 0; j < n; j++) {
192: for(j = 0; j < n; j++) {
205: for(j = 0; j < n; j++) {
217: for(j = 0; j < n; j++) {
229: for(i = 0; i < 10; i++) {The issue is for (i = 0, n = arguments.length; i < n; i++) - the comma operator in for init. Let me check test_loop.js for the infinite loop issue:
58:function test_for()
62: for(i = 0; i < 3; i++) {
68: for(var j = 0; j < 3; j++) {
79: for(i in {x:1, y: 2}) {
90: for(i in a) {
102: for(i in a) {
110: for(i = 0; i < 10; i++)
113: for(i in a) {
121: for(a.x in {x:1, y: 2}) {
129: for(a[0] in {x:1, y: 2}) {
136: for(var j in {x:1, y: 2}) {
144: for(var k = 2 in {x:1, y: 2}) {
155: for(i in {x:1, y: 2, z:3}) {
163: for(i in {x:1, y: 2, z:3}) {
187: for(let o in proxy) {
200: L1: for(i = 0; i < 3; i++) {
215: for(i = 0; i < 3; i++) {
237: for(i = 0; i < 4; i++) {
312: for(;;) {
364: for(var i in {x:1, y:2}) {I see for(;;) on line 312 - empty for conditions. Also for(var k = 2 in {x:1, y: 2}) on line 144 might be tricky. Let me also check the regex lookbehind tests and create a todo list:
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
Here's the breakdown of remaining xfail tests:
| Test | Issue | Fix Needed |
|---|---|---|
| test_builtin.js | void operator not implemented |
Add void unary operator (returns undefined) |
| test_language.js | Syntax error on getters/setters | Add get/set property syntax: {get x() {...}} |
| microbench.js | Comma operator in for-init | Support for(i=0, n=len; ...) syntax |
| test_loop.js | Times out (infinite loop) | Fix for(;;) empty conditions + for-in edge cases |
| test_regex.py | Lookbehind assertions | Add (?<=...) and (?<!...) to regex engine |
| mandelbrot.js | Times out (performance) | Low priority - it runs but is slow |
| test_rect.js | Needs C-defined classes | Not applicable - requires C extension |
for(;;)Want me to start implementing these?
The user wants me to implement all the fixes using TDD (Test-Driven Development): 1. Write a failing test first 2. Implement the fix 3. Commit when tests pass 4. Repeat
Let me start with the simplest one - the void operator.
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
cat > /tmp/test_void.py << 'EOF'
"""Test void operator."""
import pytest
from mquickjs_python import JSContext
class TestVoidOperator:
def test_void_returns_undefined(self):
ctx = JSContext()
result = ctx.eval("void 0")
assert result is None or str(result) == "undefined"
def test_void_expression(self):
ctx = JSContext()
result = ctx.eval("void (1 + 2)")
assert result is None or str(result) == "undefined"
def test_void_function_call(self):
ctx = JSContext()
result = ctx.eval("var x = 0; void (x = 5); x")
assert result == 5 # Side effect happens, but void returns undefined
EOF
uv run pytest /tmp/test_void.py -xvs 2>&1Exit code 1
============================= test session starts ==============================
platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /home/user/mquickjs-python/.venv/bin/python
cachedir: .pytest_cache
rootdir: /tmp
collecting ... collected 3 items
../../../tmp/test_void.py::TestVoidOperator::test_void_returns_undefined FAILED
=================================== FAILURES ===================================
_________________ TestVoidOperator.test_void_returns_undefined _________________
self = <test_void.TestVoidOperator object at 0x7ee3d9903190>
def test_void_returns_undefined(self):
ctx = JSContext()
> result = ctx.eval("void 0")
^^^^^^^^^^^^^^^^^^
/tmp/test_void.py:8:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
src/mquickjs_python/context.py:595: in eval
compiled = compiler.compile(ast)
^^^^^^^^^^^^^^^^^^^^^
src/mquickjs_python/compiler.py:70: in compile
self._compile_statement_for_value(body[-1])
src/mquickjs_python/compiler.py:673: in _compile_statement_for_value
self._compile_expression(node.expression)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <mquickjs_python.compiler.Compiler object at 0x7ee3d990d390>
node = UnaryExpression(operator='void', argument=NumericLiteral(value=0), prefix=True)
def _compile_expression(self, node: Node) -> None:
"""Compile an expression."""
if isinstance(node, NumericLiteral):
idx = self._add_constant(node.value)
self._emit(OpCode.LOAD_CONST, idx)
elif isinstance(node, StringLiteral):
idx = self._add_constant(node.value)
self._emit(OpCode.LOAD_CONST, idx)
elif isinstance(node, BooleanLiteral):
if node.value:
self._emit(OpCode.LOAD_TRUE)
else:
self._emit(OpCode.LOAD_FALSE)
elif isinstance(node, NullLiteral):
self._emit(OpCode.LOAD_NULL)
elif isinstance(node, RegexLiteral):
# Store (pattern, flags) tuple as constant
idx = self._add_constant((node.pattern, node.flags))
self._emit(OpCode.BUILD_REGEX, idx)
elif isinstance(node, Identifier):
name = node.name
# Check if it's a cell var (local that's captured by inner function)
cell_slot = self._get_cell_var(name)
if cell_slot is not None:
self._emit(OpCode.LOAD_CELL, cell_slot)
else:
slot = self._get_local(name)
if slot is not None:
self._emit(OpCode.LOAD_LOCAL, slot)
else:
# Check if it's a free variable (from outer scope)
closure_slot = self._get_free_var(name)
if closure_slot is not None:
self._emit(OpCode.LOAD_CLOSURE, closure_slot)
else:
idx = self._add_name(name)
self._emit(OpCode.LOAD_NAME, idx)
elif isinstance(node, ThisExpression):
self._emit(OpCode.THIS)
elif isinstance(node, ArrayExpression):
for elem in node.elements:
self._compile_expression(elem)
self._emit(OpCode.BUILD_ARRAY, len(node.elements))
elif isinstance(node, ObjectExpression):
for prop in node.properties:
# Key
if isinstance(prop.key, Identifier):
idx = self._add_constant(prop.key.name)
self._emit(OpCode.LOAD_CONST, idx)
else:
self._compile_expression(prop.key)
# Value
self._compile_expression(prop.value)
self._emit(OpCode.BUILD_OBJECT, len(node.properties))
elif isinstance(node, UnaryExpression):
self._compile_expression(node.argument)
op_map = {
"-": OpCode.NEG,
"+": OpCode.POS,
"!": OpCode.NOT,
"~": OpCode.BNOT,
"typeof": OpCode.TYPEOF,
}
if node.operator in op_map:
self._emit(op_map[node.operator])
elif node.operator == "delete":
# Handle delete specially
if isinstance(node.argument, MemberExpression):
# Recompile as delete operation
self._compile_expression(node.argument.object)
if node.argument.computed:
self._compile_expression(node.argument.property)
else:
idx = self._add_constant(node.argument.property.name)
self._emit(OpCode.LOAD_CONST, idx)
self._emit(OpCode.DELETE_PROP)
else:
self._emit(OpCode.LOAD_TRUE) # delete on non-property returns true
else:
> raise NotImplementedError(f"Unary operator: {node.operator}")
E NotImplementedError: Unary operator: void
src/mquickjs_python/compiler.py:1016: NotImplementedError
=========================== short test summary info ============================
FAILED ../../../tmp/test_void.py::TestVoidOperator::test_void_returns_undefined
!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!
============================== 1 failed in 0.36s ===============================Good - the test fails. Now I need to implement the void operator. It should evaluate its argument for side effects and return undefined.Let me look at the compiler code:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 30,
"offset": 995
} 995→ "+": OpCode.POS,
996→ "!": OpCode.NOT,
997→ "~": OpCode.BNOT,
998→ "typeof": OpCode.TYPEOF,
999→ }
1000→ if node.operator in op_map:
1001→ self._emit(op_map[node.operator])
1002→ elif node.operator == "delete":
1003→ # Handle delete specially
1004→ if isinstance(node.argument, MemberExpression):
1005→ # Recompile as delete operation
1006→ self._compile_expression(node.argument.object)
1007→ if node.argument.computed:
1008→ self._compile_expression(node.argument.property)
1009→ else:
1010→ idx = self._add_constant(node.argument.property.name)
1011→ self._emit(OpCode.LOAD_CONST, idx)
1012→ self._emit(OpCode.DELETE_PROP)
1013→ else:
1014→ self._emit(OpCode.LOAD_TRUE) # delete on non-property returns true
1015→ else:
1016→ raise NotImplementedError(f"Unary operator: {node.operator}")
1017→
1018→ elif isinstance(node, UpdateExpression):
1019→ # ++x or x++
1020→ if isinstance(node.argument, Identifier):
1021→ name = node.argument.name
1022→ inc_op = OpCode.INC if node.operator == "++" else OpCode.DEC
1023→
1024→ # Check if it's a cell var (local that's captured by inner function)
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I need to add the void operator handling. The void operator evaluates its operand for side effects, then returns undefined. I'll add it between delete and the else clause:
else:
self._emit(OpCode.LOAD_TRUE) # delete on non-property returns true
else:
raise NotImplementedError(f"Unary operator: {node.operator}") else:
self._emit(OpCode.LOAD_TRUE) # delete on non-property returns true
elif node.operator == "void":
# void evaluates argument for side effects, returns undefined
self._emit(OpCode.POP) # Discard the argument value
self._emit(OpCode.LOAD_UNDEFINED)
else:
raise NotImplementedError(f"Unary operator: {node.operator}")The file /home/user/mquickjs-python/src/mquickjs_python/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
1009→ else:
1010→ idx = self._add_constant(node.argument.property.name)
1011→ self._emit(OpCode.LOAD_CONST, idx)
1012→ self._emit(OpCode.DELETE_PROP)
1013→ else:
1014→ self._emit(OpCode.LOAD_TRUE) # delete on non-property returns true
1015→ elif node.operator == "void":
1016→ # void evaluates argument for side effects, returns undefined
1017→ self._emit(OpCode.POP) # Discard the argument value
1018→ self._emit(OpCode.LOAD_UNDEFINED)
1019→ else:
1020→ raise NotImplementedError(f"Unary operator: {node.operator}")
1021→
1022→ elif isinstance(node, UpdateExpression):
1023→ # ++x or x++
1024→ if isinstance(node.argument, Identifier):============================= test session starts ============================== platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /home/user/mquickjs-python/.venv/bin/python cachedir: .pytest_cache rootdir: /tmp collecting ... collected 3 items ../../../tmp/test_void.py::TestVoidOperator::test_void_returns_undefined PASSED ../../../tmp/test_void.py::TestVoidOperator::test_void_expression PASSED ../../../tmp/test_void.py::TestVoidOperator::test_void_function_call PASSED ============================== 3 passed in 0.13s ===============================
......xx............................ [ 83%] tests/test_string_regex.py ................... [ 88%] tests/test_vm.py ............................................. [100%] ================== 371 passed, 8 xfailed, 1 xpassed in 6.67s ===================
cat /tmp/test_void.py >> tests/test_vm.py && git add -A && git commit -m "$(cat <<'EOF' Add void operator support - void operator evaluates argument for side effects, returns undefined - Enables test_builtin.js to progress further EOF )"
2 files changed, 23 insertions(+)
git push -u origin claude/python-mquickjs-port-uPKcc 2>&1
To http://127.0.0.1:50794/git/simonw/mquickjs-python 9b1230d..6dcdde7 claude/python-mquickjs-port-uPKcc -> claude/python-mquickjs-port-uPKcc branch 'claude/python-mquickjs-port-uPKcc' set up to track 'origin/claude/python-mquickjs-port-uPKcc'.
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
cat > /tmp/test_comma.py << 'EOF'
"""Test comma operator in for-init."""
import pytest
from mquickjs_python import JSContext
class TestCommaOperator:
def test_comma_in_for_init(self):
"""Comma operator in for loop initialization."""
ctx = JSContext()
result = ctx.eval('''
var sum = 0;
for (var i = 0, n = 5; i < n; i++) {
sum += i;
}
sum
''')
assert result == 10 # 0+1+2+3+4 = 10
def test_comma_expression(self):
"""Comma as sequence expression."""
ctx = JSContext()
result = ctx.eval("(1, 2, 3)")
assert result == 3 # Returns last value
def test_comma_with_side_effects(self):
"""Comma operator evaluates all expressions."""
ctx = JSContext()
result = ctx.eval('''
var x = 0;
var y = (x = 1, x = 2, x = 3);
x + y
''')
assert result == 6 # x=3, y=3
EOF
uv run pytest /tmp/test_comma.py -xvs 2>&1============================= test session starts ============================== platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /home/user/mquickjs-python/.venv/bin/python cachedir: .pytest_cache rootdir: /tmp collecting ... collected 3 items ../../../tmp/test_comma.py::TestCommaOperator::test_comma_in_for_init PASSED ../../../tmp/test_comma.py::TestCommaOperator::test_comma_expression PASSED ../../../tmp/test_comma.py::TestCommaOperator::test_comma_with_side_effects PASSED ============================== 3 passed in 0.10s ===============================
Interesting - the comma operator already works! The issue must be more specific. Let me check what's failing in microbench.js:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
# Simpler test from microbench.js
ctx.eval('''
for (i = 0, n = 5; i < n; i++) { }
''')
print('PASS')
" 2>&1The comma operator already works! The issue must be something else in microbench.js. Let me check what line causes the error:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
try:
ctx.eval(open('tests/microbench.js').read())
except Exception as e:
print(f'ERROR: {e}')
" 2>&1if (typeof console == "undefined") {
var console = { log: print };
}
function log_line() {
var i, n, s, a;
s = "";
for (i = 0, n = arguments.length; i < n; i++) {
if (i > 0)
s += " ";
a = arguments[i];
if (typeof a == "number") {
total[i] += a;
a = a.toFixed(precs[i]);
a+="";
s += pad_left(a, widths[i]);
} else {
s += pad_left(a, widths[i]);
}
}uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
# Test the exact pattern
ctx.eval('''
for (i = 0, n = arguments.length; i < n; i++) { }
''')
print('PASS')
" 2>&1Exit code 1
Traceback (most recent call last):
File "<string>", line 5, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/context.py", line 603, in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 91, in run
return self._execute()
^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 148, in _execute
self._execute_opcode(op, arg, frame)
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 207, in _execute_opcode
raise JSReferenceError(f"{name} is not defined")
mquickjs_python.errors.JSReferenceError: ReferenceError: arguments is not definedThat's a different error (arguments not defined). Let me check where the syntax error comes from by parsing the file incrementally:
uv run python -c "
from mquickjs_python.parser import Parser
import sys
code = open('tests/microbench.js').read()
lines = code.split('\n')
# Try to find where parse fails
for end in range(10, len(lines), 10):
try:
Parser('\n'.join(lines[:end])).parse()
except Exception as e:
print(f'Parse fails around line {end}: {e}')
break
" 2>&1 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
function pad(str, n) {
str += "";
while (str.length < n)
str += " ";
return str;
}
function pad_left(str, n) {
str += "";
while (str.length < n)uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/microbench.js').read()
lines = code.split('\n')
# Binary search to find where parse fails
for end in range(1, len(lines)):
try:
Parser('\n'.join(lines[:end])).parse()
except Exception as e:
print(f'Line {end}: {lines[end-1][:60]}...')
print(f'Error: {e}')
break
" 2>&1function pad(str, n) {
str += "";
while (str.length < n)
str += " ";
return str;
}
function pad_left(str, n) {This is a valid function. The issue is that str and n are reserved words in Python but should be valid JS identifiers. But wait, looking at the parsing - it seems to get confused at line 26 when parsing the function. Let me check if the problem is multi-line comment parsing:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('''
function pad(str, n) {
str += \"\";
while (str.length < n)
str += \" \";
return str;
}
pad(\"x\", 5)
''')
print(repr(result))
" 2>&1The function works when tested alone. The issue must be with parsing multi-line comments. Let me check:
/*
* Javascript Micro benchmark
*
* Copyright (c) 2017-2019 Fabrice Bellard
* Copyright (c) 2017-2019 Charlie Gordon
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
function pad(str, n) {uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('''
/* multi
line
comment */
function pad(str, n) {
return str;
}
pad(\"x\", 5)
''')
print(repr(result))
" 2>&1uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
code = '''/*
* test
*/
function pad(str, n) {
str += \"\";
while (str.length < n)
str += \" \";
return str;
}
pad(\"x\", 5)
'''
result = ctx.eval(code)
print(repr(result))
" 2>&1uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/microbench.js').read()
# Try just the first 32 lines
lines = code.split('\n')[:32]
code_part = '\n'.join(lines)
print('Parsing:')
print(code_part)
print('---')
Parser(code_part).parse()
print('SUCCESS')
" 2>&1Parsing:
/*
* Javascript Micro benchmark
*
* Copyright (c) 2017-2019 Fabrice Bellard
* Copyright (c) 2017-2019 Charlie Gordon
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
function pad(str, n) {
str += "";
while (str.length < n)
str += " ";
return str;
}
---
SUCCESSuv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/microbench.js').read()
lines = code.split('\n')
# Keep adding lines until we find the failure
for i in range(30, min(200, len(lines))):
try:
Parser('\n'.join(lines[:i])).parse()
except Exception as e:
print(f'Fails at line {i}:')
print(lines[i-1])
print(f'Error: {e}')
break
else:
print('No parse error found in first 200 lines')
" 2>&1uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/microbench.js').read()
lines = code.split('\n')
# Try line 29 and 30
for i in [29, 30]:
try:
text = '\n'.join(lines[:i])
print(f'Lines 1-{i}:')
print(text)
print('---')
Parser(text).parse()
print('SUCCESS')
except Exception as e:
print(f'Error: {e}')
print()
" 2>&1Lines 1-29:
/*
* Javascript Micro benchmark
*
* Copyright (c) 2017-2019 Fabrice Bellard
* Copyright (c) 2017-2019 Charlie Gordon
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
function pad(str, n) {
str += "";
while (str.length < n)
str += " ";
---
Error: SyntaxError: Expected '}'
Lines 1-30:
/*
* Javascript Micro benchmark
*
* Copyright (c) 2017-2019 Fabrice Bellard
* Copyright (c) 2017-2019 Charlie Gordon
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
function pad(str, n) {
str += "";
while (str.length < n)
str += " ";
return str;
---
Error: SyntaxError: Expected '}'Both fail! They fail because the function is not closed. But when I tried with line 32 it worked! Let me check again with lines 31 and 32:
uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/microbench.js').read()
lines = code.split('\n')
# Try more lines
for i in [31, 32, 33]:
try:
text = '\n'.join(lines[:i])
Parser(text).parse()
print(f'Lines 1-{i}: SUCCESS')
except Exception as e:
print(f'Lines 1-{i}: Error: {e}')
" 2>&1}
function pad_left(str, n) {
str += "";
while (str.length < n)
str = " " + str;
return str;
}
function pad_center(str, n) {OK so the file parsing issue is actually an incremental parsing problem. Lines 1-32 works. But it says "expected '}'" when I parse lines 1-29.Let me search for the actual error in the full file:
uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/microbench.js').read()
lines = code.split('\n')
# Try from start with increments of 1
last_success = 0
for i in range(1, len(lines)+1):
try:
Parser('\n'.join(lines[:i])).parse()
last_success = i
except Exception as e:
if i > last_success + 5: # Only report if substantially after last success
print(f'Fails at line {i}: {e}')
print(f'Line content: {lines[i-1][:70]}')
break
" 2>&1function pad_center(str, n) {
str += "";
while (str.length < n) {
if ((n - str.length) & 1)
str = str + " ";
else
str = " " + str;
}
return str;
}This is valid code. The issue is that when the parser sees line 45 (just "else") it can't parse because there's no following statement yet. Let me search deeper:
uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/microbench.js').read()
try:
Parser(code).parse()
print('Full file parses OK')
except Exception as e:
print(f'Parse error: {e}')
" 2>&1OK the full file fails with "Expected ';' after for init". Let me find where that is:
uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/microbench.js').read()
lines = code.split('\n')
# Keep adding lines until we get the specific for-init error
last = 0
for i in range(1, len(lines)+1):
try:
Parser('\n'.join(lines[:i])).parse()
last = i
except Exception as e:
if 'for init' in str(e):
print(f'for-init error at line {i}:')
print(lines[i-1])
# Also show previous lines
print('Context:')
for j in range(max(0, i-5), i):
print(f'{j+1}: {lines[j]}')
break
" 2>&1for-init error at line 689:
for(i of r) {
Context:
685: for(i = 0; i < 100; i++)
686: r[i] = i;
687: for(j = 0; j < n; j++) {
688: sum = 0;
689: for(i of r) {The issue is for...of loop syntax, not the comma operator! The parser doesn't support for (x of iterable). Let me check what features are needed for microbench.js:
The issue is for...of loops (line 689), not the comma operator! Let me update the todo and write a test:
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
cat > /tmp/test_for_of.py << 'EOF'
"""Test for...of loops."""
import pytest
from mquickjs_python import JSContext
class TestForOf:
def test_for_of_array(self):
"""Basic for...of with array."""
ctx = JSContext()
result = ctx.eval('''
var sum = 0;
var arr = [1, 2, 3, 4, 5];
for (var x of arr) {
sum += x;
}
sum
''')
assert result == 15
def test_for_of_string(self):
"""for...of with string iterates characters."""
ctx = JSContext()
result = ctx.eval('''
var chars = [];
for (var c of "abc") {
chars.push(c);
}
chars.join(",")
''')
assert result == "a,b,c"
EOF
uv run pytest /tmp/test_for_of.py -xvs 2>&1Exit code 1
============================= test session starts ==============================
platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /home/user/mquickjs-python/.venv/bin/python
cachedir: .pytest_cache
rootdir: /tmp
collecting ... collected 2 items
../../../tmp/test_for_of.py::TestForOf::test_for_of_array FAILED
=================================== FAILURES ===================================
_________________________ TestForOf.test_for_of_array __________________________
self = <test_for_of.TestForOf object at 0x7ea47d1c4a90>
def test_for_of_array(self):
"""Basic for...of with array."""
ctx = JSContext()
> result = ctx.eval('''
var sum = 0;
var arr = [1, 2, 3, 4, 5];
for (var x of arr) {
sum += x;
}
sum
''')
/tmp/test_for_of.py:9:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
src/mquickjs_python/context.py:595: in eval
compiled = compiler.compile(ast)
^^^^^^^^^^^^^^^^^^^^^
src/mquickjs_python/compiler.py:66: in compile
self._compile_statement(stmt)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <mquickjs_python.compiler.Compiler object at 0x7ea47d1c5510>
node = ForOfStatement(left=VariableDeclaration(declarations=[VariableDeclarator(id=Identifier(name='x'), init=None)], kind='v...onStatement(expression=AssignmentExpression(operator='+=', left=Identifier(name='sum'), right=Identifier(name='x')))]))
def _compile_statement(self, node: Node) -> None:
"""Compile a statement."""
if isinstance(node, ExpressionStatement):
self._compile_expression(node.expression)
self._emit(OpCode.POP)
elif isinstance(node, BlockStatement):
for stmt in node.body:
self._compile_statement(stmt)
elif isinstance(node, EmptyStatement):
pass
elif isinstance(node, VariableDeclaration):
for decl in node.declarations:
name = decl.id.name
if decl.init:
self._compile_expression(decl.init)
else:
self._emit(OpCode.LOAD_UNDEFINED)
if self._in_function:
# Inside function: use local variable
self._add_local(name)
# Check if it's a cell var (captured by inner function)
cell_slot = self._get_cell_var(name)
if cell_slot is not None:
self._emit(OpCode.STORE_CELL, cell_slot)
else:
slot = self._get_local(name)
self._emit(OpCode.STORE_LOCAL, slot)
else:
# At program level: use global variable
idx = self._add_name(name)
self._emit(OpCode.STORE_NAME, idx)
self._emit(OpCode.POP)
elif isinstance(node, IfStatement):
self._compile_expression(node.test)
jump_false = self._emit_jump(OpCode.JUMP_IF_FALSE)
self._compile_statement(node.consequent)
if node.alternate:
jump_end = self._emit_jump(OpCode.JUMP)
self._patch_jump(jump_false)
self._compile_statement(node.alternate)
self._patch_jump(jump_end)
else:
self._patch_jump(jump_false)
elif isinstance(node, WhileStatement):
loop_ctx = LoopContext()
self.loop_stack.append(loop_ctx)
loop_start = len(self.bytecode)
self._compile_expression(node.test)
jump_false = self._emit_jump(OpCode.JUMP_IF_FALSE)
self._compile_statement(node.body)
self._emit(OpCode.JUMP, loop_start)
self._patch_jump(jump_false)
# Patch break jumps
for pos in loop_ctx.break_jumps:
self._patch_jump(pos)
# Patch continue jumps
for pos in loop_ctx.continue_jumps:
self._patch_jump(pos, loop_start)
self.loop_stack.pop()
elif isinstance(node, DoWhileStatement):
loop_ctx = LoopContext()
self.loop_stack.append(loop_ctx)
loop_start = len(self.bytecode)
self._compile_statement(node.body)
continue_target = len(self.bytecode)
self._compile_expression(node.test)
self._emit(OpCode.JUMP_IF_TRUE, loop_start)
# Patch break jumps
for pos in loop_ctx.break_jumps:
self._patch_jump(pos)
# Patch continue jumps
for pos in loop_ctx.continue_jumps:
self._patch_jump(pos, continue_target)
self.loop_stack.pop()
elif
... [6089 characters truncated] ...
ED)
elif isinstance(node, ThrowStatement):
self._compile_expression(node.argument)
self._emit(OpCode.THROW)
elif isinstance(node, TryStatement):
# Try block
try_start = self._emit_jump(OpCode.TRY_START)
self._compile_statement(node.block)
self._emit(OpCode.TRY_END)
# Jump past catch/finally
jump_end = self._emit_jump(OpCode.JUMP)
# Catch handler
self._patch_jump(try_start)
if node.handler:
self._emit(OpCode.CATCH)
# Store exception in catch variable
name = node.handler.param.name
self._add_local(name)
slot = self._get_local(name)
self._emit(OpCode.STORE_LOCAL, slot)
self._emit(OpCode.POP)
self._compile_statement(node.handler.body)
self._patch_jump(jump_end)
# Finally block
if node.finalizer:
self._compile_statement(node.finalizer)
elif isinstance(node, SwitchStatement):
self._compile_expression(node.discriminant)
jump_to_body: List[Tuple[int, int]] = []
default_jump = None
# Compile case tests
for i, case in enumerate(node.cases):
if case.test:
self._emit(OpCode.DUP)
self._compile_expression(case.test)
self._emit(OpCode.SEQ)
pos = self._emit_jump(OpCode.JUMP_IF_TRUE)
jump_to_body.append((pos, i))
else:
default_jump = (self._emit_jump(OpCode.JUMP), i)
# Jump to end if no match
jump_end = self._emit_jump(OpCode.JUMP)
# Case bodies
case_positions = []
loop_ctx = LoopContext(is_loop=False) # For break statements only
self.loop_stack.append(loop_ctx)
for i, case in enumerate(node.cases):
case_positions.append(len(self.bytecode))
for stmt in case.consequent:
self._compile_statement(stmt)
self._patch_jump(jump_end)
self._emit(OpCode.POP) # Pop discriminant
# Patch jumps to case bodies
for pos, idx in jump_to_body:
self._patch_jump(pos, case_positions[idx])
if default_jump:
pos, idx = default_jump
self._patch_jump(pos, case_positions[idx])
# Patch break jumps
for pos in loop_ctx.break_jumps:
self._patch_jump(pos)
self.loop_stack.pop()
elif isinstance(node, FunctionDeclaration):
# Compile function
func = self._compile_function(node.id.name, node.params, node.body)
func_idx = len(self.functions)
self.functions.append(func)
const_idx = self._add_constant(func)
self._emit(OpCode.LOAD_CONST, const_idx)
self._emit(OpCode.MAKE_CLOSURE, func_idx)
name = node.id.name
if self._in_function:
# Inside function: use local or cell variable
cell_idx = self._get_cell_var(name)
if cell_idx is not None:
# Variable is captured - store in cell
self._emit(OpCode.STORE_CELL, cell_idx)
else:
# Regular local
self._add_local(name)
slot = self._get_local(name)
self._emit(OpCode.STORE_LOCAL, slot)
else:
# At program level: use global variable
idx = self._add_name(name)
self._emit(OpCode.STORE_NAME, idx)
self._emit(OpCode.POP)
elif isinstance(node, LabeledStatement):
# Create a loop context for the label
loop_ctx = LoopContext(label=node.label.name)
self.loop_stack.append(loop_ctx)
# Compile the labeled body
self._compile_statement(node.body)
# Patch break jumps that target this label
for pos in loop_ctx.break_jumps:
self._patch_jump(pos)
self.loop_stack.pop()
else:
> raise NotImplementedError(f"Cannot compile statement: {type(node).__name__}")
E NotImplementedError: Cannot compile statement: ForOfStatement
src/mquickjs_python/compiler.py:664: NotImplementedError
=========================== short test summary info ============================
FAILED ../../../tmp/test_for_of.py::TestForOf::test_for_of_array - NotImpleme...
!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!
============================== 1 failed in 0.32s ===============================The parser already supports ForOfStatement, but the compiler doesn't. Let me check the AST nodes and add ForOfStatement support. First let me find the ForInStatement implementation to model my implementation after it:
The parser supports for-of but compiler doesn't. Let me find ForInStatement to model the implementation:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"pattern": "ForInStatement"
}14: ForInStatement, ForOfStatement, BreakStatement, ContinueStatement, 195: elif isinstance(node, ForInStatement): 430: elif isinstance(node, ForInStatement):
Good, ForOfStatement is already imported. Let me read the ForInStatement implementation:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 60,
"offset": 428
} 428→ self.loop_stack.pop()
429→
430→ elif isinstance(node, ForInStatement):
431→ loop_ctx = LoopContext()
432→ self.loop_stack.append(loop_ctx)
433→
434→ # Compile object expression
435→ self._compile_expression(node.right)
436→ self._emit(OpCode.FOR_IN_INIT)
437→
438→ loop_start = len(self.bytecode)
439→ self._emit(OpCode.FOR_IN_NEXT)
440→ jump_done = self._emit_jump(OpCode.JUMP_IF_TRUE)
441→
442→ # Store key in variable
443→ if isinstance(node.left, VariableDeclaration):
444→ decl = node.left.declarations[0]
445→ name = decl.id.name
446→ if self._in_function:
447→ self._add_local(name)
448→ slot = self._get_local(name)
449→ self._emit(OpCode.STORE_LOCAL, slot)
450→ else:
451→ idx = self._add_name(name)
452→ self._emit(OpCode.STORE_NAME, idx)
453→ self._emit(OpCode.POP)
454→ elif isinstance(node.left, Identifier):
455→ name = node.left.name
456→ slot = self._get_local(name)
457→ if slot is not None:
458→ self._emit(OpCode.STORE_LOCAL, slot)
459→ else:
460→ idx = self._add_name(name)
461→ self._emit(OpCode.STORE_NAME, idx)
462→ self._emit(OpCode.POP)
463→ elif isinstance(node.left, MemberExpression):
464→ # for (obj.prop in ...) or for (obj[key] in ...)
465→ # After FOR_IN_NEXT: stack has [..., iterator, key]
466→ # We need for SET_PROP: obj, prop, key -> value (leaves value on stack)
467→ # Compile obj and prop first, then rotate key to top
468→ self._compile_expression(node.left.object)
469→ if node.left.computed:
470→ self._compile_expression(node.left.property)
471→ else:
472→ idx = self._add_constant(node.left.property.name)
473→ self._emit(OpCode.LOAD_CONST, idx)
474→ # Stack is now: [..., iterator, key, obj, prop]
475→ # We need: [..., iterator, obj, prop, key]
476→ # ROT3 on (key, obj, prop) gives (obj, prop, key)
477→ self._emit(OpCode.ROT3)
478→ self._emit(OpCode.SET_PROP)
479→ self._emit(OpCode.POP) # Pop the result of SET_PROP
480→ else:
481→ raise NotImplementedError(f"Unsupported for-in left: {type(node.left).__name__}")
482→
483→ self._compile_statement(node.body)
484→
485→ self._emit(OpCode.JUMP, loop_start)
486→ self._patch_jump(jump_done)
487→ self._emit(OpCode.POP) # Pop iterator
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I see the ForInStatement implementation. For ForOfStatement, I need to: 1. Add opcodes FOR_OF_INIT and FOR_OF_NEXT 2. Implement them in the VM to iterate over array values (not keys)
Let me first check what opcodes exist and add the new ones:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/opcodes.py",
"pattern": "FOR_IN"
}98: FOR_IN_INIT = auto() # Initialize for-in: obj -> iterator 99: FOR_IN_NEXT = auto() # Get next for-in: iterator -> key, done
FOR_IN_INIT = auto() # Initialize for-in: obj -> iterator
FOR_IN_NEXT = auto() # Get next for-in: iterator -> key, done FOR_IN_INIT = auto() # Initialize for-in: obj -> iterator
FOR_IN_NEXT = auto() # Get next for-in: iterator -> key, done
FOR_OF_INIT = auto() # Initialize for-of: iterable -> iterator
FOR_OF_NEXT = auto() # Get next for-of: iterator -> value, doneThe file /home/user/mquickjs-python/src/mquickjs_python/opcodes.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
94→ TRY_END = auto() # End try block
95→ CATCH = auto() # Catch handler
96→
97→ # Iteration
98→ FOR_IN_INIT = auto() # Initialize for-in: obj -> iterator
99→ FOR_IN_NEXT = auto() # Get next for-in: iterator -> key, done
100→ FOR_OF_INIT = auto() # Initialize for-of: iterable -> iterator
101→ FOR_OF_NEXT = auto() # Get next for-of: iterator -> value, done
102→
103→ # Increment/Decrement
104→ INC = auto() # Increment
105→ DEC = auto() # DecrementNow let me add the ForOfStatement to the compiler. I'll add it right after ForInStatement:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 25,
"offset": 485
} 485→ self._emit(OpCode.JUMP, loop_start)
486→ self._patch_jump(jump_done)
487→ self._emit(OpCode.POP) # Pop iterator
488→
489→ # Patch break and continue jumps
490→ for pos in loop_ctx.break_jumps:
491→ self._patch_jump(pos)
492→ for pos in loop_ctx.continue_jumps:
493→ self._patch_jump(pos, loop_start)
494→
495→ self.loop_stack.pop()
496→
497→ elif isinstance(node, BreakStatement):
498→ if not self.loop_stack:
499→ raise SyntaxError("'break' outside of loop")
500→
501→ # Find the right loop context (labeled or innermost)
502→ target_label = node.label.name if node.label else None
503→ ctx = None
504→ for loop_ctx in reversed(self.loop_stack):
505→ if target_label is None or loop_ctx.label == target_label:
506→ ctx = loop_ctx
507→ break
508→
509→ if ctx is None:
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I need to add ForOfStatement handling after the ForInStatement block (which ends at line 495). Let me add it:
self.loop_stack.pop()
elif isinstance(node, BreakStatement):
if not self.loop_stack:
raise SyntaxError("'break' outside of loop") self.loop_stack.pop()
elif isinstance(node, ForOfStatement):
loop_ctx = LoopContext()
self.loop_stack.append(loop_ctx)
# Compile iterable expression
self._compile_expression(node.right)
self._emit(OpCode.FOR_OF_INIT)
loop_start = len(self.bytecode)
self._emit(OpCode.FOR_OF_NEXT)
jump_done = self._emit_jump(OpCode.JUMP_IF_TRUE)
# Store value in variable
if isinstance(node.left, VariableDeclaration):
decl = node.left.declarations[0]
name = decl.id.name
if self._in_function:
self._add_local(name)
slot = self._get_local(name)
self._emit(OpCode.STORE_LOCAL, slot)
else:
idx = self._add_name(name)
self._emit(OpCode.STORE_NAME, idx)
self._emit(OpCode.POP)
elif isinstance(node.left, Identifier):
name = node.left.name
slot = self._get_local(name)
if slot is not None:
self._emit(OpCode.STORE_LOCAL, slot)
else:
idx = self._add_name(name)
self._emit(OpCode.STORE_NAME, idx)
self._emit(OpCode.POP)
else:
raise NotImplementedError(f"Unsupported for-of left: {type(node.left).__name__}")
self._compile_statement(node.body)
self._emit(OpCode.JUMP, loop_start)
self._patch_jump(jump_done)
self._emit(OpCode.POP) # Pop iterator
# Patch break and continue jumps
for pos in loop_ctx.break_jumps:
self._patch_jump(pos)
for pos in loop_ctx.continue_jumps:
self._patch_jump(pos, loop_start)
self.loop_stack.pop()
elif isinstance(node, BreakStatement):
if not self.loop_stack:
raise SyntaxError("'break' outside of loop")The file /home/user/mquickjs-python/src/mquickjs_python/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
491→ self._patch_jump(pos)
492→ for pos in loop_ctx.continue_jumps:
493→ self._patch_jump(pos, loop_start)
494→
495→ self.loop_stack.pop()
496→
497→ elif isinstance(node, ForOfStatement):
498→ loop_ctx = LoopContext()
499→ self.loop_stack.append(loop_ctx)
500→
501→ # Compile iterable expression
502→ self._compile_expression(node.right)
503→ self._emit(OpCode.FOR_OF_INIT)
504→
505→ loop_start = len(self.bytecode)
506→ self._emit(OpCode.FOR_OF_NEXT)
507→ jump_done = self._emit_jump(OpCode.JUMP_IF_TRUE)
508→
509→ # Store value in variable
510→ if isinstance(node.left, VariableDeclaration):
511→ decl = node.left.declarations[0]
512→ name = decl.id.name
513→ if self._in_function:
514→ self._add_local(name)
515→ slot = self._get_local(name)
516→ self._emit(OpCode.STORE_LOCAL, slot)
517→ else:
518→ idx = self._add_name(name)
519→ self._emit(OpCode.STORE_NAME, idx)
520→ self._emit(OpCode.POP)
521→ elif isinstance(node.left, Identifier):
522→ name = node.left.name
523→ slot = self._get_local(name)
524→ if slot is not None:
525→ self._emit(OpCode.STORE_LOCAL, slot)
526→ else:
527→ idx = self._add_name(name)
528→ self._emit(OpCode.STORE_NAME, idx)
529→ self._emit(OpCode.POP)
530→ else:
531→ raise NotImplementedError(f"Unsupported for-of left: {type(node.left).__name__}")
532→
533→ self._compile_statement(node.body)
534→
535→ self._emit(OpCode.JUMP, loop_start)
536→ self._patch_jump(jump_done)
537→ self._emit(OpCode.POP) # Pop iterator
538→
539→ # Patch break and continue jumps
540→ for pos in loop_ctx.break_jumps:
541→ self._patch_jump(pos)
542→ for pos in loop_ctx.continue_jumps:
543→ self._patch_jump(pos, loop_start)
544→
545→ self.loop_stack.pop()
546→
547→ elif isinstance(node, BreakStatement):
548→ if not self.loop_stack:
549→ raise SyntaxError("'break' outside of loop")
550→
551→ # Find the right loop context (labeled or innermost)
552→ target_label = node.label.name if node.label else None
553→ ctx = NoneNow I need to add the VM implementation for FOR_OF_INIT and FOR_OF_NEXT. Let me find where FOR_IN_INIT is implemented:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"pattern": "FOR_IN_INIT"
}{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"limit": 35,
"offset": 506
}506→ 507→ # Iteration 508→ elif op == OpCode.FOR_IN_INIT: 509→ obj = self.stack.pop() 510→ if obj is UNDEFINED or obj is NULL: 511→ keys = [] 512→ elif isinstance(obj, JSArray): 513→ # For arrays, iterate over numeric indices as strings 514→ keys = [str(i) for i in range(len(obj._elements))] 515→ # Also include any non-numeric properties 516→ keys.extend(obj.keys()) 517→ elif isinstance(obj, JSObject): 518→ keys = obj.keys() 519→ else: 520→ keys = [] 521→ self.stack.append(ForInIterator(keys)) 522→ 523→ elif op == OpCode.FOR_IN_NEXT: 524→ iterator = self.stack[-1] 525→ if isinstance(iterator, ForInIterator): 526→ key, done = iterator.next() 527→ if done: 528→ self.stack.append(True) 529→ else: 530→ self.stack.append(key) 531→ self.stack.append(False) 532→ else: 533→ self.stack.append(True) 534→ 535→ # Increment/Decrement 536→ elif op == OpCode.INC: 537→ a = self.stack.pop() 538→ self.stack.append(to_number(a) + 1) 539→ 540→ elif op == OpCode.DEC: <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
I see how FOR_IN works. I need to create a ForOfIterator that iterates over values, not keys. Let me first check if ForInIterator is defined in vm.py:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"pattern": "class ForInIterator"
}{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"limit": 20,
"offset": 37
} 37→
38→
39→class ForInIterator:
40→ """Iterator for for-in loops."""
41→ def __init__(self, keys: List[str]):
42→ self.keys = keys
43→ self.index = 0
44→
45→ def next(self) -> Tuple[Optional[str], bool]:
46→ """Return (key, done)."""
47→ if self.index >= len(self.keys):
48→ return None, True
49→ key = self.keys[self.index]
50→ self.index += 1
51→ return key, False
52→
53→
54→class VM:
55→ """JavaScript virtual machine."""
56→
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
class ForInIterator:
"""Iterator for for-in loops."""
def __init__(self, keys: List[str]):
self.keys = keys
self.index = 0
def next(self) -> Tuple[Optional[str], bool]:
"""Return (key, done)."""
if self.index >= len(self.keys):
return None, True
key = self.keys[self.index]
self.index += 1
return key, False
class VM:class ForInIterator:
"""Iterator for for-in loops."""
def __init__(self, keys: List[str]):
self.keys = keys
self.index = 0
def next(self) -> Tuple[Optional[str], bool]:
"""Return (key, done)."""
if self.index >= len(self.keys):
return None, True
key = self.keys[self.index]
self.index += 1
return key, False
class ForOfIterator:
"""Iterator for for-of loops."""
def __init__(self, values: List):
self.values = values
self.index = 0
def next(self) -> Tuple[Any, bool]:
"""Return (value, done)."""
if self.index >= len(self.values):
return None, True
value = self.values[self.index]
self.index += 1
return value, False
class VM:The file /home/user/mquickjs-python/src/mquickjs_python/vm.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
35→ closure_cells: List[ClosureCell] = None # Cells for captured variables (from outer function)
36→ cell_storage: List[ClosureCell] = None # Cells for variables captured by inner functions
37→
38→
39→class ForInIterator:
40→ """Iterator for for-in loops."""
41→ def __init__(self, keys: List[str]):
42→ self.keys = keys
43→ self.index = 0
44→
45→ def next(self) -> Tuple[Optional[str], bool]:
46→ """Return (key, done)."""
47→ if self.index >= len(self.keys):
48→ return None, True
49→ key = self.keys[self.index]
50→ self.index += 1
51→ return key, False
52→
53→
54→class ForOfIterator:
55→ """Iterator for for-of loops."""
56→ def __init__(self, values: List):
57→ self.values = values
58→ self.index = 0
59→
60→ def next(self) -> Tuple[Any, bool]:
61→ """Return (value, done)."""
62→ if self.index >= len(self.values):
63→ return None, True
64→ value = self.values[self.index]
65→ self.index += 1
66→ return value, False
67→
68→
69→class VM:
70→ """JavaScript virtual machine."""
71→
72→ def __init__(
73→ self, elif op == OpCode.FOR_IN_NEXT:
iterator = self.stack[-1]
if isinstance(iterator, ForInIterator):
key, done = iterator.next()
if done:
self.stack.append(True)
else:
self.stack.append(key)
self.stack.append(False)
else:
self.stack.append(True)
# Increment/Decrement elif op == OpCode.FOR_IN_NEXT:
iterator = self.stack[-1]
if isinstance(iterator, ForInIterator):
key, done = iterator.next()
if done:
self.stack.append(True)
else:
self.stack.append(key)
self.stack.append(False)
else:
self.stack.append(True)
elif op == OpCode.FOR_OF_INIT:
iterable = self.stack.pop()
if iterable is UNDEFINED or iterable is NULL:
values = []
elif isinstance(iterable, JSArray):
values = list(iterable._elements)
elif isinstance(iterable, str):
# Strings iterate over characters
values = list(iterable)
elif isinstance(iterable, list):
values = list(iterable)
else:
values = []
self.stack.append(ForOfIterator(values))
elif op == OpCode.FOR_OF_NEXT:
iterator = self.stack[-1]
if isinstance(iterator, ForOfIterator):
value, done = iterator.next()
if done:
self.stack.append(True)
else:
self.stack.append(value)
self.stack.append(False)
else:
self.stack.append(True)
# Increment/DecrementThe file /home/user/mquickjs-python/src/mquickjs_python/vm.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 534→ else: 535→ keys = [] 536→ self.stack.append(ForInIterator(keys)) 537→ 538→ elif op == OpCode.FOR_IN_NEXT: 539→ iterator = self.stack[-1] 540→ if isinstance(iterator, ForInIterator): 541→ key, done = iterator.next() 542→ if done: 543→ self.stack.append(True) 544→ else: 545→ self.stack.append(key) 546→ self.stack.append(False) 547→ else: 548→ self.stack.append(True) 549→ 550→ elif op == OpCode.FOR_OF_INIT: 551→ iterable = self.stack.pop() 552→ if iterable is UNDEFINED or iterable is NULL: 553→ values = [] 554→ elif isinstance(iterable, JSArray): 555→ values = list(iterable._elements) 556→ elif isinstance(iterable, str): 557→ # Strings iterate over characters 558→ values = list(iterable) 559→ elif isinstance(iterable, list): 560→ values = list(iterable) 561→ else: 562→ values = [] 563→ self.stack.append(ForOfIterator(values)) 564→ 565→ elif op == OpCode.FOR_OF_NEXT: 566→ iterator = self.stack[-1] 567→ if isinstance(iterator, ForOfIterator): 568→ value, done = iterator.next() 569→ if done: 570→ self.stack.append(True) 571→ else: 572→ self.stack.append(value) 573→ self.stack.append(False) 574→ else: 575→ self.stack.append(True) 576→ 577→ # Increment/Decrement 578→ elif op == OpCode.INC: 579→ a = self.stack.pop() 580→ self.stack.append(to_number(a) + 1) 581→
============================= test session starts ============================== platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /home/user/mquickjs-python/.venv/bin/python cachedir: .pytest_cache rootdir: /tmp collecting ... collected 2 items ../../../tmp/test_for_of.py::TestForOf::test_for_of_array PASSED ../../../tmp/test_for_of.py::TestForOf::test_for_of_string PASSED ============================== 2 passed in 0.14s ===============================
......xx............................ [ 82%] tests/test_string_regex.py ................... [ 87%] tests/test_vm.py ................................................ [100%] ================== 374 passed, 8 xfailed, 1 xpassed in 6.68s ===================
cat /tmp/test_for_of.py >> tests/test_vm.py && git add -A && git commit -m "$(cat <<'EOF' Add for...of loop support - Add FOR_OF_INIT and FOR_OF_NEXT opcodes - Add ForOfIterator class for value iteration - Supports arrays and strings - Enables microbench.js to parse (needs more features to run) EOF )" && git push -u origin claude/python-mquickjs-port-uPKcc 2>&1
4 files changed, 123 insertions(+) To http://127.0.0.1:50794/git/simonw/mquickjs-python 6dcdde7..e8e5761 claude/python-mquickjs-port-uPKcc -> claude/python-mquickjs-port-uPKcc branch 'claude/python-mquickjs-port-uPKcc' set up to track 'origin/claude/python-mquickjs-port-uPKcc'.
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
cat > /tmp/test_empty_for.py << 'EOF'
"""Test for loops with empty conditions."""
import pytest
from mquickjs_python import JSContext
class TestEmptyFor:
def test_for_empty_all(self):
"""for(;;) with break."""
ctx = JSContext()
result = ctx.eval('''
var i = 0;
for (;;) {
i++;
if (i >= 5) break;
}
i
''')
assert result == 5
def test_for_empty_init(self):
"""for(; cond; update)."""
ctx = JSContext()
result = ctx.eval('''
var i = 0;
for (; i < 3; i++) { }
i
''')
assert result == 3
def test_for_empty_update(self):
"""for(init; cond;)."""
ctx = JSContext()
result = ctx.eval('''
var sum = 0;
for (var i = 0; i < 3;) {
sum += i;
i++;
}
sum
''')
assert result == 3 # 0+1+2
EOF
uv run pytest /tmp/test_empty_for.py -xvs 2>&1============================= test session starts ============================== platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /home/user/mquickjs-python/.venv/bin/python cachedir: .pytest_cache rootdir: /tmp collecting ... collected 3 items ../../../tmp/test_empty_for.py::TestEmptyFor::test_for_empty_all PASSED ../../../tmp/test_empty_for.py::TestEmptyFor::test_for_empty_init PASSED ../../../tmp/test_empty_for.py::TestEmptyFor::test_for_empty_update PASSED ============================== 3 passed in 0.14s ===============================
Empty for loops already work! That must have been fixed. Let me check what's still failing in test_loop.js:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
try:
ctx.eval(open('tests/test_loop.js').read())
print('PASS')
except Exception as e:
print(f'ERROR: {type(e).__name__}: {e}')
" 2>&1It times out, meaning there's an infinite loop. Let me search for what might cause it:
79: for(i in {x:1, y: 2}) {
90: for(i in a) {
102: for(i in a) {
113: for(i in a) {
121: for(a.x in {x:1, y: 2}) {
129: for(a[0] in {x:1, y: 2}) {
136: for(var j in {x:1, y: 2}) {
144: for(var k = 2 in {x:1, y: 2}) {
155: for(i in {x:1, y: 2, z:3}) {
163: for(i in {x:1, y: 2, z:3}) {
172:function test_for_in_proxy() {
187: for(let o in proxy) {
364: for(var i in {x:1, y:2}) {Line 144 has for(var k = 2 in {x:1, y: 2}) which is unusual - the variable has an initializer. Let me also check line 172 - it uses Proxy which we might not support.Let me try to isolate which test function causes the timeout:
uv run python -c "
from mquickjs_python import JSContext
code = open('tests/test_loop.js').read()
# Try to run each test function
test_fns = [
'test_while', 'test_do_while', 'test_for', 'test_for_in',
'test_for_in_proxy', 'test_continue', 'test_switch', 'test_break'
]
for fn in test_fns:
ctx = JSContext(time_limit=1.0)
try:
# Define the test infrastructure and run just this function
ctx.eval(code.split('// main()')[0]) # Just define functions
ctx.eval(f'{fn}()')
print(f'{fn}: PASS')
except Exception as e:
print(f'{fn}: {type(e).__name__}: {str(e)[:60]}')
" 2>&1test_while: TimeLimitError: InternalError: Execution timeout test_do_while: TimeLimitError: InternalError: Execution timeout test_for: TimeLimitError: InternalError: Execution timeout test_for_in: TimeLimitError: InternalError: Execution timeout test_for_in_proxy: TimeLimitError: InternalError: Execution timeout test_continue: TimeLimitError: InternalError: Execution timeout test_switch: TimeLimitError: InternalError: Execution timeout test_break: TimeLimitError: InternalError: Execution timeout
uv run python -c "
from mquickjs_python import JSContext
# Just try test_while
ctx = JSContext(time_limit=1.0)
ctx.eval('''
function test_while()
{
var i, j;
i = 0;
while (i < 3) {
assert(i < 3);
i++;
}
assert(i, 3);
}
test_while()
''')
print('PASS')
" 2>&1Exit code 1
Traceback (most recent call last):
File "<string>", line 6, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/context.py", line 603, in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 106, in run
return self._execute()
^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 163, in _execute
self._execute_opcode(op, arg, frame)
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 222, in _execute_opcode
raise JSReferenceError(f"{name} is not defined")
mquickjs_python.errors.JSReferenceError: ReferenceError: assert is not definedThe assert function is not defined. The test requires the assert infrastructure. Let me run the full file but break it up:
uv run python -c "
from mquickjs_python import JSContext
code = open('tests/test_loop.js').read()
# The file structure is: definitions, then main() call at the end
# Let's find where the test functions end
import re
# Extract just the support code (assert functions) and test_while
ctx = JSContext(time_limit=2.0)
# First define helper functions
helper = '''
function assert(actual, expected, message) {
if (arguments.length == 1) expected = true;
if (actual !== expected) {
throw Error(\"assertion failed: \" + actual + \" !== \" + expected);
}
}
'''
# Simple while test
test = '''
function test_while() {
var i = 0;
while (i < 3) {
i++;
}
assert(i, 3);
}
test_while();
'''
ctx.eval(helper + test)
print('test_while PASS')
" 2>&1The basic while loop works. The issue must be in specific patterns in test_loop.js. Let me check what's in the file more carefully:
function assert(actual, expected, message) {
if (arguments.length == 1)
expected = true;
if (actual === expected)
return;
if (actual !== null && expected !== null
&& typeof actual == 'object' && typeof expected == 'object'
&& actual.toString() === expected.toString())
return;
throw Error("assertion failed: got |" + actual + "|" +
", expected |" + expected + "|" +
(message ? " (" + message + ")" : ""));
}
/*----------------*/
function test_while()
{
var i, c;
i = 0;
c = 0;
while (i < 3) {
c++;
i++;
}
assert(c === 3);
}
function test_while_break()
{
var i, c;
i = 0;
c = 0;
while (i < 3) {
c++;
if (i == 1)
break;
i++;
}
assert(c === 2 && i === 1);
}
function test_do_while()
{
var i, c;
i = 0;
c = 0;
do {
c++;
i++;
} while (i < 3);
assert(c === 3 && i === 3);
}
function test_for()
{
var i, c;uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/test_loop.js').read()
try:
Parser(code).parse()
print('Parse OK')
except Exception as e:
print(f'Parse error: {e}')
" 2>&1File parses OK. The timeout is in execution. Let me check what's at the end of the file (main function):
s += i;
throw "a";
} catch (e) {
s += e;
} finally {
s += "f";
}
}
assert(s, "xafyaf");
}
test_while();
test_while_break();
test_do_while();
test_for();
test_for_break();
test_switch1();
test_switch2();
test_for_in();
test_for_in2();
//test_for_in_proxy();
test_try_catch1();
test_try_catch2();
test_try_catch3();
test_try_catch4();
test_try_catch5();
test_try_catch6();
test_try_catch7();
test_try_catch8();uv run python -c "
from mquickjs_python import JSContext
# Test just the assert and test_while functions
code = '''
function assert(actual, expected, message) {
if (arguments.length == 1)
expected = true;
if (actual === expected)
return;
if (actual !== null && expected !== null
&& typeof actual == 'object' && typeof expected == 'object'
&& actual.toString() === expected.toString())
return;
throw Error(\"assertion failed\");
}
function test_while()
{
var i, c;
i = 0;
c = 0;
while (i < 3) {
c++;
i++;
}
assert(c === 3);
}
test_while();
'''
ctx = JSContext(time_limit=2.0)
ctx.eval(code)
print('test_while PASS')
" 2>&1uv run python -c "
from mquickjs_python import JSContext
code = open('tests/test_loop.js').read()
lines = code.split('\n')
# Try incrementally larger portions
tests = [
'test_while();',
'test_while_break();',
'test_do_while();',
'test_for();',
'test_for_break();',
'test_switch1();',
]
for t in tests:
# Find where this test is called and include everything up to it
idx = None
for i, line in enumerate(lines):
if line.strip() == t:
idx = i
break
if idx is None:
print(f'{t}: not found')
continue
ctx = JSContext(time_limit=1.0)
try:
# Include everything up to and including this test call
ctx.eval('\n'.join(lines[:idx+1]))
print(f'{t}: PASS')
except Exception as e:
print(f'{t}: {type(e).__name__}: {str(e)[:50]}')
break
" 2>&1test_while();: PASS test_while_break();: PASS test_do_while();: PASS test_for();: PASS test_for_break();: PASS test_switch1();: PASS
uv run python -c "
from mquickjs_python import JSContext
code = open('tests/test_loop.js').read()
lines = code.split('\n')
tests = [
'test_switch2();',
'test_for_in();',
'test_for_in2();',
'test_try_catch1();',
]
for t in tests:
idx = None
for i, line in enumerate(lines):
if line.strip() == t:
idx = i
break
if idx is None:
print(f'{t}: not found')
continue
ctx = JSContext(time_limit=1.0)
try:
ctx.eval('\n'.join(lines[:idx+1]))
print(f'{t}: PASS')
except Exception as e:
print(f'{t}: {type(e).__name__}: {str(e)[:50]}')
break
" 2>&1uv run python -c "
from mquickjs_python import JSContext
code = open('tests/test_loop.js').read()
lines = code.split('\n')
tests = [
'test_try_catch2();',
'test_try_catch3();',
'test_try_catch4();',
'test_try_catch5();',
'test_try_catch6();',
'test_try_catch7();',
'test_try_catch8();',
]
for t in tests:
idx = None
for i, line in enumerate(lines):
if line.strip() == t:
idx = i
break
if idx is None:
print(f'{t}: not found')
continue
ctx = JSContext(time_limit=1.0)
try:
ctx.eval('\n'.join(lines[:idx+1]))
print(f'{t}: PASS')
except Exception as e:
print(f'{t}: {type(e).__name__}: {str(e)[:80]}')
break
" 2>&1test_try_catch2();: PASS test_try_catch3();: PASS test_try_catch4();: PASS test_try_catch5();: TimeLimitError: InternalError: Execution timeout
function test_try_catch5()
{
var s;
s = "";
for(;;) {
try {
s += "t";
break;
s += "b";
} finally {
s += "f";
}
}
assert(s, "tf", "catch");
}
function test_try_catch6()
{
function f() {
try {
s += 't';
return 1;
} finally {
s += "f";
}
}
var s = "";
assert(f(), 1);
assert(s, "tf", "catch6");
}test_try_catch5 uses for(;;) with a break inside a try-finally. The issue might be that break inside a try-finally block doesn't work correctly. Let me test this:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=1.0)
result = ctx.eval('''
var s = \"\";
for(;;) {
try {
s += \"t\";
break;
s += \"b\";
} finally {
s += \"f\";
}
}
s
''')
print(f'Result: {repr(result)}')
" 2>&1Interesting - it returns 't' but not 'tf'. The break is happening but finally isn't being executed. But it doesn't infinite loop. Let me try with a longer timeout:
uv run python -c "
from mquickjs_python import JSContext
code = open('tests/test_loop.js').read()
# Find and run just test_try_catch5
ctx = JSContext(time_limit=2.0)
# Get the assert and test_try_catch5 functions
import re
assert_fn = re.search(r'function assert\([^)]*\)\s*\{[^}]+\}', code, re.DOTALL).group()
test_fn = re.search(r'function test_try_catch5\(\)[^{]*\{.*?^}', code, re.MULTILINE | re.DOTALL).group()
ctx.eval(assert_fn)
ctx.eval(test_fn)
ctx.eval('test_try_catch5()')
print('PASS')
" 2>&1Exit code 1
Traceback (most recent call last):
File "<string>", line 16, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/context.py", line 603, in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 106, in run
return self._execute()
^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 129, in _execute
self._check_limits()
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 117, in _check_limits
raise TimeLimitError("Execution timeout")
mquickjs_python.errors.TimeLimitError: InternalError: Execution timeoutSo the issue is with running in context with all the other code. Let me try with simpler code:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
# Run full test_try_catch5
result = ctx.eval('''
function assert(actual, expected, message) {
if (actual === expected) return;
throw Error(\"assertion failed: got |\" + actual + \"|\");
}
function test_try_catch5()
{
var s;
s = \"\";
for(;;) {
try {
s += \"t\";
break;
s += \"b\";
} finally {
s += \"f\";
}
}
assert(s, \"tf\", \"catch\");
}
test_try_catch5();
\"done\"
''')
print(f'Result: {result}')
" 2>&1Exit code 1
Traceback (most recent call last):
File "<string>", line 6, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/context.py", line 603, in eval
result = vm.run(compiled)
^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 106, in run
return self._execute()
^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 129, in _execute
self._check_limits()
File "/home/user/mquickjs-python/src/mquickjs_python/vm.py", line 117, in _check_limits
raise TimeLimitError("Execution timeout")
mquickjs_python.errors.TimeLimitError: InternalError: Execution timeoutSo there's an infinite loop involving try-finally-break. But when I tested without the assert it returned 't'. The issue might be with finally not executing properly in the context of break. Let me check:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=1.0)
# Simple test without function
result = ctx.eval('''
var s = \"\";
for(var i = 0; i < 3; i++) {
try {
s += \"t\";
if (i == 1) break;
} finally {
s += \"f\";
}
}
s
''')
print(f'Result: {repr(result)}')
" 2>&1The result is 'tft' but should be 'tftf' (should run finally even when breaking). And it's not executing finally on break. This is a complex fix.However, for now let me focus on the getter/setter syntax which is simpler and will unlock test_language.js. The try-finally-break issue is more complex and can be fixed later.Let me update the todo and move on:
The try-finally-break issue is complex - finally doesn't execute properly on break. Let me move on to getter/setter which is simpler:
Todos have been modified successfully. Ensure that you continue to use the todo list to track your progress. Please proceed with the current tasks if applicable
cat > /tmp/test_getter_setter.py << 'EOF'
"""Test getter/setter property syntax."""
import pytest
from mquickjs_python import JSContext
class TestGetterSetter:
def test_getter(self):
"""Basic getter."""
ctx = JSContext()
result = ctx.eval('''
var obj = {
_x: 10,
get x() { return this._x; }
};
obj.x
''')
assert result == 10
def test_setter(self):
"""Basic setter."""
ctx = JSContext()
result = ctx.eval('''
var obj = {
_x: 0,
set x(v) { this._x = v; }
};
obj.x = 42;
obj._x
''')
assert result == 42
def test_getter_setter_combined(self):
"""Getter and setter together."""
ctx = JSContext()
result = ctx.eval('''
var obj = {
_value: 5,
get value() { return this._value * 2; },
set value(v) { this._value = v; }
};
obj.value = 10;
obj.value
''')
assert result == 20 # 10 * 2
EOF
uv run pytest /tmp/test_getter_setter.py -xvs 2>&1Exit code 1
============================= test session starts ==============================
platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /home/user/mquickjs-python/.venv/bin/python
cachedir: .pytest_cache
rootdir: /tmp
collecting ... collected 3 items
../../../tmp/test_getter_setter.py::TestGetterSetter::test_getter FAILED
=================================== FAILURES ===================================
_________________________ TestGetterSetter.test_getter _________________________
self = <test_getter_setter.TestGetterSetter object at 0x7ef50c2cc050>
def test_getter(self):
"""Basic getter."""
ctx = JSContext()
result = ctx.eval('''
var obj = {
_x: 10,
get x() { return this._x; }
};
obj.x
''')
> assert result == 10
E assert [Function (anonymous)] == 10
/tmp/test_getter_setter.py:16: AssertionError
=========================== short test summary info ============================
FAILED ../../../tmp/test_getter_setter.py::TestGetterSetter::test_getter - as...
!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!
============================== 1 failed in 0.28s ===============================Interesting - it's parsing get x() but treating it as a method, not a getter. The result is a function instead of the value 10. I need to update:
get and set as property kinds{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/parser.py",
"pattern": "ObjectExpression|Property"
}9: RegexLiteral, Identifier, ThisExpression, ArrayExpression, ObjectExpression, Property, 759: def _parse_object_literal(self) -> ObjectExpression: 761: properties: List[Property] = [] 768: return ObjectExpression(properties) 770: def _parse_property(self) -> Property: 788: return Property(key, value, "init", computed=False, shorthand=True) 799: return Property(key, value, "init", computed=False, shorthand=True) 843: return Property(key, value, kind, computed=computed)
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/parser.py",
"limit": 80,
"offset": 768
} 768→ return ObjectExpression(properties)
769→
770→ def _parse_property(self) -> Property:
771→ """Parse object property."""
772→ # Check for getter/setter
773→ kind = "init"
774→ if self._check(TokenType.IDENTIFIER):
775→ if self.current.value == "get":
776→ # Could be getter or property named "get"
777→ self._advance()
778→ if self._check(TokenType.IDENTIFIER, TokenType.STRING, TokenType.NUMBER):
779→ kind = "get"
780→ else:
781→ # It's a property named "get"
782→ key = Identifier("get")
783→ if self._match(TokenType.COLON):
784→ value = self._parse_assignment_expression()
785→ else:
786→ # Shorthand: {get}
787→ value = key
788→ return Property(key, value, "init", computed=False, shorthand=True)
789→ elif self.current.value == "set":
790→ self._advance()
791→ if self._check(TokenType.IDENTIFIER, TokenType.STRING, TokenType.NUMBER):
792→ kind = "set"
793→ else:
794→ key = Identifier("set")
795→ if self._match(TokenType.COLON):
796→ value = self._parse_assignment_expression()
797→ else:
798→ value = key
799→ return Property(key, value, "init", computed=False, shorthand=True)
800→
801→ # Parse key
802→ computed = False
803→ if self._match(TokenType.LBRACKET):
804→ key = self._parse_assignment_expression()
805→ self._expect(TokenType.RBRACKET, "Expected ']' after computed property name")
806→ computed = True
807→ elif self._match(TokenType.STRING):
808→ key = StringLiteral(self.previous.value)
809→ elif self._match(TokenType.NUMBER):
810→ key = NumericLiteral(self.previous.value)
811→ elif self._match(TokenType.IDENTIFIER):
812→ key = Identifier(self.previous.value)
813→ else:
814→ raise self._error("Expected property name")
815→
816→ # Parse value
817→ if kind in ("get", "set"):
818→ # Getter/setter - value is a function
819→ params = self._parse_function_params()
820→ body = self._parse_block_statement()
821→ value = FunctionExpression(None, params, body)
822→ elif self._match(TokenType.LPAREN):
823→ # Method shorthand: {foo() { }}
824→ params = []
825→ if not self._check(TokenType.RPAREN):
826→ while True:
827→ param = self._expect(TokenType.IDENTIFIER, "Expected parameter name")
828→ params.append(Identifier(param.value))
829→ if not self._match(TokenType.COMMA):
830→ break
831→ self._expect(TokenType.RPAREN, "Expected ')' after parameters")
832→ body = self._parse_block_statement()
833→ value = FunctionExpression(None, params, body)
834→ elif self._match(TokenType.COLON):
835→ value = self._parse_assignment_expression()
836→ else:
837→ # Shorthand property: {x} means {x: x}
838→ if isinstance(key, Identifier):
839→ value = key
840→ else:
841→ raise self._error("Expected ':' after property name")
842→
843→ return Property(key, value, kind, computed=computed)
844→
845→ def _parse_function_expression(self) -> FunctionExpression:
846→ """Parse function expression."""
847→ name = None
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
The parser already handles getter/setter syntax! It sets kind = "get" or kind = "set". The problem must be in the compiler/VM. Let me check how the compiler handles Property:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"pattern": "ObjectExpression"
}7: RegexLiteral, Identifier, ThisExpression, ArrayExpression, ObjectExpression, Property, 1029: elif isinstance(node, ObjectExpression):
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/compiler.py",
"limit": 20,
"offset": 1027
} 1027→ self._emit(OpCode.BUILD_ARRAY, len(node.elements))
1028→
1029→ elif isinstance(node, ObjectExpression):
1030→ for prop in node.properties:
1031→ # Key
1032→ if isinstance(prop.key, Identifier):
1033→ idx = self._add_constant(prop.key.name)
1034→ self._emit(OpCode.LOAD_CONST, idx)
1035→ else:
1036→ self._compile_expression(prop.key)
1037→ # Value
1038→ self._compile_expression(prop.value)
1039→ self._emit(OpCode.BUILD_OBJECT, len(node.properties))
1040→
1041→ elif isinstance(node, UnaryExpression):
1042→ self._compile_expression(node.argument)
1043→ op_map = {
1044→ "-": OpCode.NEG,
1045→ "+": OpCode.POS,
1046→ "!": OpCode.NOT,
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
The compiler doesn't handle the kind property of Property nodes at all. It just compiles key and value. For getters/setters, we need a different approach.The simplest fix is:1. When building the object, include the kind along with key/value
2. In VM's BUILD_OBJECT, create property descriptors for getters/settersLet me update the compiler to also pass the kind, and then update the VM to handle it:
elif isinstance(node, ObjectExpression):
for prop in node.properties:
# Key
if isinstance(prop.key, Identifier):
idx = self._add_constant(prop.key.name)
self._emit(OpCode.LOAD_CONST, idx)
else:
self._compile_expression(prop.key)
# Value
self._compile_expression(prop.value)
self._emit(OpCode.BUILD_OBJECT, len(node.properties)) elif isinstance(node, ObjectExpression):
for prop in node.properties:
# Key
if isinstance(prop.key, Identifier):
idx = self._add_constant(prop.key.name)
self._emit(OpCode.LOAD_CONST, idx)
else:
self._compile_expression(prop.key)
# Kind (for getters/setters)
kind_idx = self._add_constant(prop.kind)
self._emit(OpCode.LOAD_CONST, kind_idx)
# Value
self._compile_expression(prop.value)
self._emit(OpCode.BUILD_OBJECT, len(node.properties))The file /home/user/mquickjs-python/src/mquickjs_python/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
1025→ for elem in node.elements:
1026→ self._compile_expression(elem)
1027→ self._emit(OpCode.BUILD_ARRAY, len(node.elements))
1028→
1029→ elif isinstance(node, ObjectExpression):
1030→ for prop in node.properties:
1031→ # Key
1032→ if isinstance(prop.key, Identifier):
1033→ idx = self._add_constant(prop.key.name)
1034→ self._emit(OpCode.LOAD_CONST, idx)
1035→ else:
1036→ self._compile_expression(prop.key)
1037→ # Kind (for getters/setters)
1038→ kind_idx = self._add_constant(prop.kind)
1039→ self._emit(OpCode.LOAD_CONST, kind_idx)
1040→ # Value
1041→ self._compile_expression(prop.value)
1042→ self._emit(OpCode.BUILD_OBJECT, len(node.properties))
1043→
1044→ elif isinstance(node, UnaryExpression):
1045→ self._compile_expression(node.argument)
1046→ op_map = {Now I need to update the VM to handle the kind when building objects. Let me find BUILD_OBJECT in the VM:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"pattern": "BUILD_OBJECT"
}156: OpCode.BUILD_ARRAY, OpCode.BUILD_OBJECT, OpCode.BUILD_REGEX, 280: elif op == OpCode.BUILD_OBJECT: 1484: OpCode.BUILD_ARRAY, OpCode.BUILD_OBJECT, OpCode.BUILD_REGEX,
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"limit": 20,
"offset": 278
}278→ self.stack.append(arr) 279→ 280→ elif op == OpCode.BUILD_OBJECT: 281→ obj = JSObject() 282→ pairs = [] 283→ for _ in range(arg): 284→ value = self.stack.pop() 285→ key = self.stack.pop() 286→ pairs.insert(0, (key, value)) 287→ for key, value in pairs: 288→ key_str = to_string(key) if not isinstance(key, str) else key 289→ obj.set(key_str, value) 290→ self.stack.append(obj) 291→ 292→ elif op == OpCode.BUILD_REGEX: 293→ pattern, flags = frame.func.constants[arg] 294→ regex = JSRegExp(pattern, flags) 295→ self.stack.append(regex) 296→ 297→ # Arithmetic <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
I need to update BUILD_OBJECT to handle the kind field. Now each property has 3 values on the stack: key, kind, value. Let me also update JSObject to support getters and setters:
elif op == OpCode.BUILD_OBJECT:
obj = JSObject()
pairs = []
for _ in range(arg):
value = self.stack.pop()
key = self.stack.pop()
pairs.insert(0, (key, value))
for key, value in pairs:
key_str = to_string(key) if not isinstance(key, str) else key
obj.set(key_str, value)
self.stack.append(obj) elif op == OpCode.BUILD_OBJECT:
obj = JSObject()
props = []
for _ in range(arg):
value = self.stack.pop()
kind = self.stack.pop()
key = self.stack.pop()
props.insert(0, (key, kind, value))
for key, kind, value in props:
key_str = to_string(key) if not isinstance(key, str) else key
if kind == "get":
obj.define_getter(key_str, value)
elif kind == "set":
obj.define_setter(key_str, value)
else:
obj.set(key_str, value)
self.stack.append(obj)The file /home/user/mquickjs-python/src/mquickjs_python/vm.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 276→ arr = JSArray() 277→ arr._elements = elements 278→ self.stack.append(arr) 279→ 280→ elif op == OpCode.BUILD_OBJECT: 281→ obj = JSObject() 282→ props = [] 283→ for _ in range(arg): 284→ value = self.stack.pop() 285→ kind = self.stack.pop() 286→ key = self.stack.pop() 287→ props.insert(0, (key, kind, value)) 288→ for key, kind, value in props: 289→ key_str = to_string(key) if not isinstance(key, str) else key 290→ if kind == "get": 291→ obj.define_getter(key_str, value) 292→ elif kind == "set": 293→ obj.define_setter(key_str, value) 294→ else: 295→ obj.set(key_str, value) 296→ self.stack.append(obj) 297→ 298→ elif op == OpCode.BUILD_REGEX: 299→ pattern, flags = frame.func.constants[arg] 300→ regex = JSRegExp(pattern, flags)
Now I need to add define_getter, define_setter methods to JSObject, and update the get method to call getters when accessing properties. Let me check JSObject:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/values.py",
"limit": 45,
"offset": 173
} 173→
174→
175→class JSObject:
176→ """JavaScript object."""
177→
178→ def __init__(self, prototype: Optional["JSObject"] = None):
179→ self._properties: Dict[str, JSValue] = {}
180→ self._prototype = prototype
181→
182→ def get(self, key: str) -> JSValue:
183→ """Get a property value."""
184→ if key in self._properties:
185→ return self._properties[key]
186→ if self._prototype is not None:
187→ return self._prototype.get(key)
188→ return UNDEFINED
189→
190→ def set(self, key: str, value: JSValue) -> None:
191→ """Set a property value."""
192→ self._properties[key] = value
193→
194→ def has(self, key: str) -> bool:
195→ """Check if object has own property."""
196→ return key in self._properties
197→
198→ def delete(self, key: str) -> bool:
199→ """Delete a property."""
200→ if key in self._properties:
201→ del self._properties[key]
202→ return True
203→ return False
204→
205→ def keys(self) -> List[str]:
206→ """Get own enumerable property keys."""
207→ return list(self._properties.keys())
208→
209→ def __repr__(self) -> str:
210→ return f"JSObject({self._properties})"
211→
212→
213→class JSCallableObject(JSObject):
214→ """JavaScript object that is also callable (for constructors like Number, String, Boolean)."""
215→
216→ def __init__(self, call_fn, prototype: Optional["JSObject"] = None):
217→ super().__init__(prototype)
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I need to add getters and setters to JSObject. The issue is that getters/setters need to be invoked when the property is accessed, and they need this bound correctly. This is complex because get() doesn't have access to call the function.A simpler approach: store getters/setters separately and check them in the VM when doing GET_PROP. Let me update JSObject:
class JSObject:
"""JavaScript object."""
def __init__(self, prototype: Optional["JSObject"] = None):
self._properties: Dict[str, JSValue] = {}
self._prototype = prototype
def get(self, key: str) -> JSValue:
"""Get a property value."""
if key in self._properties:
return self._properties[key]
if self._prototype is not None:
return self._prototype.get(key)
return UNDEFINED
def set(self, key: str, value: JSValue) -> None:
"""Set a property value."""
self._properties[key] = value
def has(self, key: str) -> bool:
"""Check if object has own property."""
return key in self._properties
def delete(self, key: str) -> bool:
"""Delete a property."""
if key in self._properties:
del self._properties[key]
return True
return False
def keys(self) -> List[str]:
"""Get own enumerable property keys."""
return list(self._properties.keys())
def __repr__(self) -> str:
return f"JSObject({self._properties})"class JSObject:
"""JavaScript object."""
def __init__(self, prototype: Optional["JSObject"] = None):
self._properties: Dict[str, JSValue] = {}
self._getters: Dict[str, Any] = {} # property name -> getter function
self._setters: Dict[str, Any] = {} # property name -> setter function
self._prototype = prototype
def get(self, key: str) -> JSValue:
"""Get a property value (does not invoke getters - use get_property for that)."""
if key in self._properties:
return self._properties[key]
if self._prototype is not None:
return self._prototype.get(key)
return UNDEFINED
def get_getter(self, key: str) -> Optional[Any]:
"""Get the getter function for a property, if any."""
if key in self._getters:
return self._getters[key]
if self._prototype is not None:
return self._prototype.get_getter(key)
return None
def get_setter(self, key: str) -> Optional[Any]:
"""Get the setter function for a property, if any."""
if key in self._setters:
return self._setters[key]
if self._prototype is not None:
return self._prototype.get_setter(key)
return None
def define_getter(self, key: str, getter: Any) -> None:
"""Define a getter for a property."""
self._getters[key] = getter
def define_setter(self, key: str, setter: Any) -> None:
"""Define a setter for a property."""
self._setters[key] = setter
def set(self, key: str, value: JSValue) -> None:
"""Set a property value."""
self._properties[key] = value
def has(self, key: str) -> bool:
"""Check if object has own property."""
return key in self._properties
def delete(self, key: str) -> bool:
"""Delete a property."""
if key in self._properties:
del self._properties[key]
return True
return False
def keys(self) -> List[str]:
"""Get own enumerable property keys."""
return list(self._properties.keys())
def __repr__(self) -> str:
return f"JSObject({self._properties})"The file /home/user/mquickjs-python/src/mquickjs_python/values.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
171→ # TODO: Handle objects with toString
172→ return "[object Object]"
173→
174→
175→class JSObject:
176→ """JavaScript object."""
177→
178→ def __init__(self, prototype: Optional["JSObject"] = None):
179→ self._properties: Dict[str, JSValue] = {}
180→ self._getters: Dict[str, Any] = {} # property name -> getter function
181→ self._setters: Dict[str, Any] = {} # property name -> setter function
182→ self._prototype = prototype
183→
184→ def get(self, key: str) -> JSValue:
185→ """Get a property value (does not invoke getters - use get_property for that)."""
186→ if key in self._properties:
187→ return self._properties[key]
188→ if self._prototype is not None:
189→ return self._prototype.get(key)
190→ return UNDEFINED
191→
192→ def get_getter(self, key: str) -> Optional[Any]:
193→ """Get the getter function for a property, if any."""
194→ if key in self._getters:
195→ return self._getters[key]
196→ if self._prototype is not None:
197→ return self._prototype.get_getter(key)
198→ return None
199→
200→ def get_setter(self, key: str) -> Optional[Any]:
201→ """Get the setter function for a property, if any."""
202→ if key in self._setters:
203→ return self._setters[key]
204→ if self._prototype is not None:
205→ return self._prototype.get_setter(key)
206→ return None
207→
208→ def define_getter(self, key: str, getter: Any) -> None:
209→ """Define a getter for a property."""
210→ self._getters[key] = getter
211→
212→ def define_setter(self, key: str, setter: Any) -> None:
213→ """Define a setter for a property."""
214→ self._setters[key] = setter
215→
216→ def set(self, key: str, value: JSValue) -> None:
217→ """Set a property value."""
218→ self._properties[key] = value
219→
220→ def has(self, key: str) -> bool:
221→ """Check if object has own property."""
222→ return key in self._properties
223→
224→ def delete(self, key: str) -> bool:
225→ """Delete a property."""
226→ if key in self._properties:
227→ del self._properties[key]
228→ return True
229→ return False
230→
231→ def keys(self) -> List[str]:
232→ """Get own enumerable property keys."""
233→ return list(self._properties.keys())
234→
235→ def __repr__(self) -> str:
236→ return f"JSObject({self._properties})"
237→
238→
239→class JSCallableObject(JSObject):
240→ """JavaScript object that is also callable (for constructors like Number, String, Boolean)."""Now I need to update the VM's GET_PROP and SET_PROP to check for getters/setters. Let me find those:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"pattern": "GET_PROP|SET_PROP"
}{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"limit": 20,
"offset": 251
}251→ 252→ # Properties 253→ elif op == OpCode.GET_PROP: 254→ key = self.stack.pop() 255→ obj = self.stack.pop() 256→ self.stack.append(self._get_property(obj, key)) 257→ 258→ elif op == OpCode.SET_PROP: 259→ value = self.stack.pop() 260→ key = self.stack.pop() 261→ obj = self.stack.pop() 262→ self._set_property(obj, key, value) 263→ self.stack.append(value) 264→ 265→ elif op == OpCode.DELETE_PROP: 266→ key = self.stack.pop() 267→ obj = self.stack.pop() 268→ result = self._delete_property(obj, key) 269→ self.stack.append(result) 270→ <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
Good - they use _get_property and _set_property helper methods. Let me find and update those:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"pattern": "def _get_property|def _set_property"
}725: def _get_property(self, obj: JSValue, key: JSValue) -> JSValue: 1400: def _set_property(self, obj: JSValue, key: JSValue, value: JSValue) -> None:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"limit": 50,
"offset": 723
} 723→ return False
724→
725→ def _get_property(self, obj: JSValue, key: JSValue) -> JSValue:
726→ """Get property from object."""
727→ if obj is UNDEFINED or obj is NULL:
728→ raise JSTypeError(f"Cannot read property of {obj}")
729→
730→ key_str = to_string(key) if not isinstance(key, str) else key
731→
732→ if isinstance(obj, JSArray):
733→ # Array index access
734→ try:
735→ idx = int(key_str)
736→ if idx >= 0:
737→ return obj.get_index(idx)
738→ except ValueError:
739→ pass
740→ if key_str == "length":
741→ return obj.length
742→ # Built-in array methods
743→ array_methods = [
744→ "push", "pop", "shift", "unshift", "toString", "join",
745→ "map", "filter", "reduce", "forEach", "indexOf", "lastIndexOf",
746→ "find", "findIndex", "some", "every", "concat", "slice",
747→ "reverse", "includes",
748→ ]
749→ if key_str in array_methods:
750→ return self._make_array_method(obj, key_str)
751→ return obj.get(key_str)
752→
753→ if isinstance(obj, JSRegExp):
754→ # RegExp methods and properties
755→ if key_str in ("test", "exec"):
756→ return self._make_regexp_method(obj, key_str)
757→ # RegExp properties
758→ if key_str in ("source", "flags", "global", "ignoreCase", "multiline",
759→ "dotAll", "unicode", "sticky", "lastIndex"):
760→ return obj.get(key_str)
761→ return UNDEFINED
762→
763→ if isinstance(obj, JSFunction):
764→ # Function methods
765→ if key_str in ("bind", "call", "apply", "toString"):
766→ return self._make_function_method(obj, key_str)
767→ if key_str == "length":
768→ return len(obj.params)
769→ if key_str == "name":
770→ return obj.name
771→ return UNDEFINED
772→
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"limit": 50,
"offset": 770
} 770→ return obj.name
771→ return UNDEFINED
772→
773→ if isinstance(obj, JSObject):
774→ # Built-in Object methods
775→ if key_str in ("toString", "hasOwnProperty"):
776→ return self._make_object_method(obj, key_str)
777→ return obj.get(key_str)
778→
779→ if isinstance(obj, str):
780→ # String character access
781→ try:
782→ idx = int(key_str)
783→ if 0 <= idx < len(obj):
784→ return obj[idx]
785→ except ValueError:
786→ pass
787→ if key_str == "length":
788→ return len(obj)
789→ # String methods
790→ string_methods = [
791→ "charAt", "charCodeAt", "indexOf", "lastIndexOf",
792→ "substring", "slice", "split", "toLowerCase", "toUpperCase",
793→ "trim", "concat", "repeat", "startsWith", "endsWith",
794→ "includes", "replace", "match", "search", "toString",
795→ ]
796→ if key_str in string_methods:
797→ return self._make_string_method(obj, key_str)
798→ return UNDEFINED
799→
800→ if isinstance(obj, (int, float)):
801→ # Number methods
802→ if key_str in ("toFixed", "toString"):
803→ return self._make_number_method(obj, key_str)
804→ return UNDEFINED
805→
806→ return UNDEFINED
807→
808→ def _make_array_method(self, arr: JSArray, method: str) -> Any:
809→ """Create a bound array method."""
810→ vm = self # Reference for closures
811→
812→ def push_fn(*args):
813→ for arg in args:
814→ arr.push(arg)
815→ return arr.length
816→
817→ def pop_fn(*args):
818→ return arr.pop()
819→
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I see JSObject is handled at line 773-777. I need to add getter check there. Let me update this:
if isinstance(obj, JSObject):
# Built-in Object methods
if key_str in ("toString", "hasOwnProperty"):
return self._make_object_method(obj, key_str)
return obj.get(key_str) if isinstance(obj, JSObject):
# Built-in Object methods
if key_str in ("toString", "hasOwnProperty"):
return self._make_object_method(obj, key_str)
# Check for getter
getter = obj.get_getter(key_str)
if getter is not None:
return self._invoke_getter(getter, obj)
return obj.get(key_str)The file /home/user/mquickjs-python/src/mquickjs_python/vm.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
769→ if key_str == "name":
770→ return obj.name
771→ return UNDEFINED
772→
773→ if isinstance(obj, JSObject):
774→ # Built-in Object methods
775→ if key_str in ("toString", "hasOwnProperty"):
776→ return self._make_object_method(obj, key_str)
777→ # Check for getter
778→ getter = obj.get_getter(key_str)
779→ if getter is not None:
780→ return self._invoke_getter(getter, obj)
781→ return obj.get(key_str)
782→
783→ if isinstance(obj, str):
784→ # String character access
785→ try:Now I need to add _invoke_getter method. And also update _set_property for setters. Let me find _set_property and update it, and then add the invoke methods:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"limit": 30,
"offset": 1398
} 1398→ "match": match,
1399→ "search": search,
1400→ "toString": toString,
1401→ }
1402→ return methods.get(method, lambda *args: UNDEFINED)
1403→
1404→ def _set_property(self, obj: JSValue, key: JSValue, value: JSValue) -> None:
1405→ """Set property on object."""
1406→ if obj is UNDEFINED or obj is NULL:
1407→ raise JSTypeError(f"Cannot set property of {obj}")
1408→
1409→ key_str = to_string(key) if not isinstance(key, str) else key
1410→
1411→ if isinstance(obj, JSArray):
1412→ try:
1413→ idx = int(key_str)
1414→ if idx >= 0:
1415→ obj.set_index(idx, value)
1416→ return
1417→ except (ValueError, IndexError):
1418→ pass
1419→ obj.set(key_str, value)
1420→ elif isinstance(obj, JSObject):
1421→ obj.set(key_str, value)
1422→
1423→ def _delete_property(self, obj: JSValue, key: JSValue) -> bool:
1424→ """Delete property from object."""
1425→ if isinstance(obj, JSObject):
1426→ key_str = to_string(key) if not isinstance(key, str) else key
1427→ return obj.delete(key_str)
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
Let me update _set_property to check for setters and then add the invoke methods. First, update _set_property:
def _set_property(self, obj: JSValue, key: JSValue, value: JSValue) -> None:
"""Set property on object."""
if obj is UNDEFINED or obj is NULL:
raise JSTypeError(f"Cannot set property of {obj}")
key_str = to_string(key) if not isinstance(key, str) else key
if isinstance(obj, JSArray):
try:
idx = int(key_str)
if idx >= 0:
obj.set_index(idx, value)
return
except (ValueError, IndexError):
pass
obj.set(key_str, value)
elif isinstance(obj, JSObject):
obj.set(key_str, value) def _set_property(self, obj: JSValue, key: JSValue, value: JSValue) -> None:
"""Set property on object."""
if obj is UNDEFINED or obj is NULL:
raise JSTypeError(f"Cannot set property of {obj}")
key_str = to_string(key) if not isinstance(key, str) else key
if isinstance(obj, JSArray):
try:
idx = int(key_str)
if idx >= 0:
obj.set_index(idx, value)
return
except (ValueError, IndexError):
pass
obj.set(key_str, value)
elif isinstance(obj, JSObject):
# Check for setter
setter = obj.get_setter(key_str)
if setter is not None:
self._invoke_setter(setter, obj, value)
else:
obj.set(key_str, value)The file /home/user/mquickjs-python/src/mquickjs_python/vm.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
1400→ "toString": toString,
1401→ }
1402→ return methods.get(method, lambda *args: UNDEFINED)
1403→
1404→ def _set_property(self, obj: JSValue, key: JSValue, value: JSValue) -> None:
1405→ """Set property on object."""
1406→ if obj is UNDEFINED or obj is NULL:
1407→ raise JSTypeError(f"Cannot set property of {obj}")
1408→
1409→ key_str = to_string(key) if not isinstance(key, str) else key
1410→
1411→ if isinstance(obj, JSArray):
1412→ try:
1413→ idx = int(key_str)
1414→ if idx >= 0:
1415→ obj.set_index(idx, value)
1416→ return
1417→ except (ValueError, IndexError):
1418→ pass
1419→ obj.set(key_str, value)
1420→ elif isinstance(obj, JSObject):
1421→ # Check for setter
1422→ setter = obj.get_setter(key_str)
1423→ if setter is not None:
1424→ self._invoke_setter(setter, obj, value)
1425→ else:
1426→ obj.set(key_str, value)
1427→
1428→ def _delete_property(self, obj: JSValue, key: JSValue) -> bool:
1429→ """Delete property from object."""
1430→ if isinstance(obj, JSObject):Now I need to add the _invoke_getter and _invoke_setter methods. Let me add them after _set_property:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/vm.py",
"limit": 15,
"offset": 1427
}1427→ 1428→ def _delete_property(self, obj: JSValue, key: JSValue) -> bool: 1429→ """Delete property from object.""" 1430→ if isinstance(obj, JSObject): 1431→ key_str = to_string(key) if not isinstance(key, str) else key 1432→ return obj.delete(key_str) 1433→ return False 1434→ 1435→ def _call_function(self, arg_count: int, this_val: Optional[JSValue]) -> None: 1436→ """Call a function.""" 1437→ args = [] 1438→ for _ in range(arg_count): 1439→ args.insert(0, self.stack.pop()) 1440→ callee = self.stack.pop() 1441→ <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
def _delete_property(self, obj: JSValue, key: JSValue) -> bool:
"""Delete property from object."""
if isinstance(obj, JSObject):
key_str = to_string(key) if not isinstance(key, str) else key
return obj.delete(key_str)
return False
def _call_function(self, arg_count: int, this_val: Optional[JSValue]) -> None: def _delete_property(self, obj: JSValue, key: JSValue) -> bool:
"""Delete property from object."""
if isinstance(obj, JSObject):
key_str = to_string(key) if not isinstance(key, str) else key
return obj.delete(key_str)
return False
def _invoke_getter(self, getter: Any, this_val: JSValue) -> JSValue:
"""Invoke a getter function and return its result."""
if isinstance(getter, JSFunction):
# Save current state
old_stack_len = len(self.stack)
# Invoke the getter with no arguments
self._invoke_js_function(getter, [], this_val)
# The result is on the stack
if len(self.stack) > old_stack_len:
return self.stack.pop()
return UNDEFINED
elif callable(getter):
return getter()
return UNDEFINED
def _invoke_setter(self, setter: Any, this_val: JSValue, value: JSValue) -> None:
"""Invoke a setter function."""
if isinstance(setter, JSFunction):
# Invoke the setter with the value as argument
self._invoke_js_function(setter, [value], this_val)
# Setter returns nothing, discard any result
if self.stack:
self.stack.pop()
elif callable(setter):
setter(value)
def _call_function(self, arg_count: int, this_val: Optional[JSValue]) -> None:The file /home/user/mquickjs-python/src/mquickjs_python/vm.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file: 1424→ self._invoke_setter(setter, obj, value) 1425→ else: 1426→ obj.set(key_str, value) 1427→ 1428→ def _delete_property(self, obj: JSValue, key: JSValue) -> bool: 1429→ """Delete property from object.""" 1430→ if isinstance(obj, JSObject): 1431→ key_str = to_string(key) if not isinstance(key, str) else key 1432→ return obj.delete(key_str) 1433→ return False 1434→ 1435→ def _invoke_getter(self, getter: Any, this_val: JSValue) -> JSValue: 1436→ """Invoke a getter function and return its result.""" 1437→ if isinstance(getter, JSFunction): 1438→ # Save current state 1439→ old_stack_len = len(self.stack) 1440→ # Invoke the getter with no arguments 1441→ self._invoke_js_function(getter, [], this_val) 1442→ # The result is on the stack 1443→ if len(self.stack) > old_stack_len: 1444→ return self.stack.pop() 1445→ return UNDEFINED 1446→ elif callable(getter): 1447→ return getter() 1448→ return UNDEFINED 1449→ 1450→ def _invoke_setter(self, setter: Any, this_val: JSValue, value: JSValue) -> None: 1451→ """Invoke a setter function.""" 1452→ if isinstance(setter, JSFunction): 1453→ # Invoke the setter with the value as argument 1454→ self._invoke_js_function(setter, [value], this_val) 1455→ # Setter returns nothing, discard any result 1456→ if self.stack: 1457→ self.stack.pop() 1458→ elif callable(setter): 1459→ setter(value) 1460→ 1461→ def _call_function(self, arg_count: int, this_val: Optional[JSValue]) -> None: 1462→ """Call a function.""" 1463→ args = [] 1464→ for _ in range(arg_count): 1465→ args.insert(0, self.stack.pop())
============================= test session starts ============================== platform linux -- Python 3.11.14, pytest-9.0.2, pluggy-1.6.0 -- /home/user/mquickjs-python/.venv/bin/python cachedir: .pytest_cache rootdir: /tmp collecting ... collected 3 items ../../../tmp/test_getter_setter.py::TestGetterSetter::test_getter PASSED ../../../tmp/test_getter_setter.py::TestGetterSetter::test_setter PASSED ../../../tmp/test_getter_setter.py::TestGetterSetter::test_getter_setter_combined PASSED ============================== 3 passed in 0.15s ===============================
tests/test_lexer.py .................................................... [ 43%] .. [ 43%] tests/test_parser.py ................................................... [ 57%] ........ [ 59%] tests/test_regex.py .................................................... [ 72%] ......xx............................ [ 82%] tests/test_string_regex.py ................... [ 87%] tests/test_vm.py .................................................. [100%] ================== 376 passed, 8 xfailed, 1 xpassed in 6.53s ===================
cat /tmp/test_getter_setter.py >> tests/test_vm.py && git add -A && git commit -m "$(cat <<'EOF' Add getter/setter property syntax support - Update JSObject to store getters and setters separately - Update compiler to pass property kind (get/set/init) to VM - Add _invoke_getter and _invoke_setter helpers in VM - Check for getters/setters in GET_PROP and SET_PROP operations EOF )" && git push -u origin claude/python-mquickjs-port-uPKcc 2>&1
4 files changed, 119 insertions(+), 6 deletions(-) To http://127.0.0.1:50794/git/simonw/mquickjs-python e8e5761..e1b6786 claude/python-mquickjs-port-uPKcc -> claude/python-mquickjs-port-uPKcc branch 'claude/python-mquickjs-port-uPKcc' set up to track 'origin/claude/python-mquickjs-port-uPKcc'.
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=2.0)
try:
ctx.eval(open('tests/test_language.js').read())
print('PASS')
except Exception as e:
print(f'ERROR: {type(e).__name__}: {e}')
" 2>&1Still failing with "Expected property name". Let me check what syntax is causing the problem:
grep -n "get\s\|set\s" tests/test_language.js | head -5
There's also f(v) { return v + 1 } - that's a method shorthand. Let me check what the error is more precisely:
uv run python -c "
from mquickjs_python.parser import Parser
# Try to parse just that object literal
code = '''var a = {get x() { return 1; }, set x(v) { }, f(v) { return v + 1 }}'''
Parser(code).parse()
print('PASS')
" 2>&1uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/test_language.js').read()
lines = code.split('\n')
# Binary search for the failing line
for i in range(1, len(lines)+1):
try:
Parser('\n'.join(lines[:i])).parse()
except Exception as e:
if 'property name' in str(e):
print(f'Fails at line {i}:')
print(lines[i-1])
# Show context
print('Context:')
for j in range(max(0, i-3), i):
print(f'{j+1}: {lines[j]}')
break
" 2>&1Fails at line 268:
a = {x: 1, if: 2};
Context:
266: assert(("x" in a), false, "delete in");
267:
268: a = {x: 1, if: 2};The issue is {x: 1, if: 2} - using if (a reserved keyword) as a property name. In JavaScript, reserved words can be used as property names in object literals. Let me fix the parser:
The issue is {if: 2} - using a keyword as property name. Let me fix the parser to allow reserved words as property names:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/parser.py",
"limit": 20,
"offset": 800
} 800→
801→ # Parse key
802→ computed = False
803→ if self._match(TokenType.LBRACKET):
804→ key = self._parse_assignment_expression()
805→ self._expect(TokenType.RBRACKET, "Expected ']' after computed property name")
806→ computed = True
807→ elif self._match(TokenType.STRING):
808→ key = StringLiteral(self.previous.value)
809→ elif self._match(TokenType.NUMBER):
810→ key = NumericLiteral(self.previous.value)
811→ elif self._match(TokenType.IDENTIFIER):
812→ key = Identifier(self.previous.value)
813→ else:
814→ raise self._error("Expected property name")
815→
816→ # Parse value
817→ if kind in ("get", "set"):
818→ # Getter/setter - value is a function
819→ params = self._parse_function_params()
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I see - at line 813, if the token is not an identifier, it fails. But reserved keywords like if, for, etc. should also be allowed as property names. Let me update this:
# Parse key
computed = False
if self._match(TokenType.LBRACKET):
key = self._parse_assignment_expression()
self._expect(TokenType.RBRACKET, "Expected ']' after computed property name")
computed = True
elif self._match(TokenType.STRING):
key = StringLiteral(self.previous.value)
elif self._match(TokenType.NUMBER):
key = NumericLiteral(self.previous.value)
elif self._match(TokenType.IDENTIFIER):
key = Identifier(self.previous.value)
else:
raise self._error("Expected property name") # Parse key
computed = False
if self._match(TokenType.LBRACKET):
key = self._parse_assignment_expression()
self._expect(TokenType.RBRACKET, "Expected ']' after computed property name")
computed = True
elif self._match(TokenType.STRING):
key = StringLiteral(self.previous.value)
elif self._match(TokenType.NUMBER):
key = NumericLiteral(self.previous.value)
elif self._match(TokenType.IDENTIFIER):
key = Identifier(self.previous.value)
elif self._is_keyword():
# Reserved words can be used as property names
key = Identifier(self.current.value if hasattr(self.current, 'value') else self.current.type.name.lower())
self._advance()
else:
raise self._error("Expected property name")The file /home/user/mquickjs-python/src/mquickjs_python/parser.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
797→ else:
798→ value = key
799→ return Property(key, value, "init", computed=False, shorthand=True)
800→
801→ # Parse key
802→ computed = False
803→ if self._match(TokenType.LBRACKET):
804→ key = self._parse_assignment_expression()
805→ self._expect(TokenType.RBRACKET, "Expected ']' after computed property name")
806→ computed = True
807→ elif self._match(TokenType.STRING):
808→ key = StringLiteral(self.previous.value)
809→ elif self._match(TokenType.NUMBER):
810→ key = NumericLiteral(self.previous.value)
811→ elif self._match(TokenType.IDENTIFIER):
812→ key = Identifier(self.previous.value)
813→ elif self._is_keyword():
814→ # Reserved words can be used as property names
815→ key = Identifier(self.current.value if hasattr(self.current, 'value') else self.current.type.name.lower())
816→ self._advance()
817→ else:
818→ raise self._error("Expected property name")
819→
820→ # Parse value
821→ if kind in ("get", "set"):
822→ # Getter/setter - value is a functionI need to add a _is_keyword method to the parser. Let me check if it exists or add it:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/parser.py",
"pattern": "def _is_keyword"
}{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/parser.py",
"pattern": "def _check|def _match|def _advance"
}51: def _advance(self) -> Token: 57: def _check(self, *types: TokenType) -> bool: 61: def _match(self, *types: TokenType) -> bool:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/parser.py",
"limit": 20,
"offset": 59
} 59→ return self.current.type in types
60→
61→ def _match(self, *types: TokenType) -> bool:
62→ """If current token matches, advance and return True."""
63→ if self._check(*types):
64→ self._advance()
65→ return True
66→ return False
67→
68→ def _expect(self, token_type: TokenType, message: str) -> Token:
69→ """Expect a specific token type or raise error."""
70→ if self.current.type != token_type:
71→ raise self._error(message)
72→ return self._advance()
73→
74→ def _is_at_end(self) -> bool:
75→ """Check if we've reached the end of input."""
76→ return self.current.type == TokenType.EOF
77→
78→ def _peek_next(self) -> Token:
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
def _is_at_end(self) -> bool:
"""Check if we've reached the end of input."""
return self.current.type == TokenType.EOF
def _peek_next(self) -> Token: def _is_at_end(self) -> bool:
"""Check if we've reached the end of input."""
return self.current.type == TokenType.EOF
def _is_keyword(self) -> bool:
"""Check if current token is a keyword (reserved word)."""
# Keywords that can be used as property names in object literals
keyword_types = {
TokenType.IF, TokenType.ELSE, TokenType.FOR, TokenType.WHILE,
TokenType.DO, TokenType.SWITCH, TokenType.CASE, TokenType.DEFAULT,
TokenType.BREAK, TokenType.CONTINUE, TokenType.RETURN, TokenType.THROW,
TokenType.TRY, TokenType.CATCH, TokenType.FINALLY, TokenType.FUNCTION,
TokenType.VAR, TokenType.NEW, TokenType.DELETE, TokenType.TYPEOF,
TokenType.IN, TokenType.INSTANCEOF, TokenType.THIS, TokenType.TRUE,
TokenType.FALSE, TokenType.NULL, TokenType.VOID, TokenType.LET,
TokenType.CONST, TokenType.CLASS, TokenType.EXTENDS, TokenType.SUPER,
TokenType.IMPORT, TokenType.EXPORT, TokenType.DEBUGGER, TokenType.WITH,
}
return self.current.type in keyword_types
def _peek_next(self) -> Token:The file /home/user/mquickjs-python/src/mquickjs_python/parser.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
70→ if self.current.type != token_type:
71→ raise self._error(message)
72→ return self._advance()
73→
74→ def _is_at_end(self) -> bool:
75→ """Check if we've reached the end of input."""
76→ return self.current.type == TokenType.EOF
77→
78→ def _is_keyword(self) -> bool:
79→ """Check if current token is a keyword (reserved word)."""
80→ # Keywords that can be used as property names in object literals
81→ keyword_types = {
82→ TokenType.IF, TokenType.ELSE, TokenType.FOR, TokenType.WHILE,
83→ TokenType.DO, TokenType.SWITCH, TokenType.CASE, TokenType.DEFAULT,
84→ TokenType.BREAK, TokenType.CONTINUE, TokenType.RETURN, TokenType.THROW,
85→ TokenType.TRY, TokenType.CATCH, TokenType.FINALLY, TokenType.FUNCTION,
86→ TokenType.VAR, TokenType.NEW, TokenType.DELETE, TokenType.TYPEOF,
87→ TokenType.IN, TokenType.INSTANCEOF, TokenType.THIS, TokenType.TRUE,
88→ TokenType.FALSE, TokenType.NULL, TokenType.VOID, TokenType.LET,
89→ TokenType.CONST, TokenType.CLASS, TokenType.EXTENDS, TokenType.SUPER,
90→ TokenType.IMPORT, TokenType.EXPORT, TokenType.DEBUGGER, TokenType.WITH,
91→ }
92→ return self.current.type in keyword_types
93→
94→ def _peek_next(self) -> Token:
95→ """Peek at the next token without consuming it."""
96→ # Save current state
97→ saved_pos = self.lexer.pos
98→ saved_line = self.lexer.lineuv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('var a = {x: 1, if: 2}; a')
print(f'Result: {result}')
" 2>&1Exit code 1
Traceback (most recent call last):
File "<string>", line 4, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/context.py", line 591, in eval
ast = parser.parse()
^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 116, in parse
stmt = self._parse_statement()
^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 132, in _parse_statement
return self._parse_variable_declaration()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 198, in _parse_variable_declaration
init = self._parse_assignment_expression()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 443, in _parse_assignment_expression
expr = self._parse_conditional_expression(exclude_in)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 548, in _parse_conditional_expression
expr = self._parse_binary_expression(0, exclude_in)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 560, in _parse_binary_expression
left = self._parse_unary_expression()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 662, in _parse_unary_expression
return self._parse_postfix_expression()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 666, in _parse_postfix_expression
expr = self._parse_new_expression()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 702, in _parse_new_expression
return self._parse_primary_expression()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 750, in _parse_primary_expression
return self._parse_object_literal()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 779, in _parse_object_literal
prop = self._parse_property()
^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 829, in _parse_property
elif self._is_keyword():
^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 88, in _is_keyword
TokenType.FALSE, TokenType.NULL, TokenType.VOID, TokenType.LET,
^^^^^^^^^^^^^
File "/usr/lib/python3.11/enum.py", line 786, in __getattr__
raise AttributeError(name) from None
AttributeError: LET. Did you mean: 'LE'?TokenType doesn't have LET, CONST, etc. Let me check what keywords actually exist:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/tokens.py",
"pattern": "class TokenType"
}grep "^\s*[A-Z].*=.*auto" /home/user/mquickjs-python/src/mquickjs_python/tokens.py | head -60
EOF = auto()
NUMBER = auto()
STRING = auto()
REGEX = auto()
IDENTIFIER = auto()
VAR = auto()
FUNCTION = auto()
RETURN = auto()
IF = auto()
ELSE = auto()
WHILE = auto()
DO = auto()
FOR = auto()
IN = auto()
OF = auto()
BREAK = auto()
CONTINUE = auto()
SWITCH = auto()
CASE = auto()
DEFAULT = auto()
TRY = auto()
CATCH = auto()
FINALLY = auto()
THROW = auto()
NEW = auto()
DELETE = auto()
TYPEOF = auto()
INSTANCEOF = auto()
THIS = auto()
TRUE = auto()
FALSE = auto()
NULL = auto()
VOID = auto()
LPAREN = auto() # (
RPAREN = auto() # )
LBRACE = auto() # {
RBRACE = auto() # }
LBRACKET = auto() # [
RBRACKET = auto() # ]
SEMICOLON = auto() # ;
COMMA = auto() # ,
DOT = auto() # .
COLON = auto() # :
QUESTION = auto() # ?
PLUS = auto() # +
MINUS = auto() # -
STAR = auto() # *
SLASH = auto() # /
PERCENT = auto() # %
STARSTAR = auto() # **
PLUSPLUS = auto() # ++
MINUSMINUS = auto() # --
LT = auto() # <
GT = auto() # >
LE = auto() # <=
GE = auto() # >=
EQ = auto() # ==
NE = auto() # !=
EQEQ = auto() # ===
NENE = auto() # !== def _is_keyword(self) -> bool:
"""Check if current token is a keyword (reserved word)."""
# Keywords that can be used as property names in object literals
keyword_types = {
TokenType.IF, TokenType.ELSE, TokenType.FOR, TokenType.WHILE,
TokenType.DO, TokenType.SWITCH, TokenType.CASE, TokenType.DEFAULT,
TokenType.BREAK, TokenType.CONTINUE, TokenType.RETURN, TokenType.THROW,
TokenType.TRY, TokenType.CATCH, TokenType.FINALLY, TokenType.FUNCTION,
TokenType.VAR, TokenType.NEW, TokenType.DELETE, TokenType.TYPEOF,
TokenType.IN, TokenType.INSTANCEOF, TokenType.THIS, TokenType.TRUE,
TokenType.FALSE, TokenType.NULL, TokenType.VOID, TokenType.LET,
TokenType.CONST, TokenType.CLASS, TokenType.EXTENDS, TokenType.SUPER,
TokenType.IMPORT, TokenType.EXPORT, TokenType.DEBUGGER, TokenType.WITH,
}
return self.current.type in keyword_types def _is_keyword(self) -> bool:
"""Check if current token is a keyword (reserved word)."""
# Keywords that can be used as property names in object literals
keyword_types = {
TokenType.IF, TokenType.ELSE, TokenType.FOR, TokenType.WHILE,
TokenType.DO, TokenType.SWITCH, TokenType.CASE, TokenType.DEFAULT,
TokenType.BREAK, TokenType.CONTINUE, TokenType.RETURN, TokenType.THROW,
TokenType.TRY, TokenType.CATCH, TokenType.FINALLY, TokenType.FUNCTION,
TokenType.VAR, TokenType.NEW, TokenType.DELETE, TokenType.TYPEOF,
TokenType.IN, TokenType.OF, TokenType.INSTANCEOF, TokenType.THIS,
TokenType.TRUE, TokenType.FALSE, TokenType.NULL, TokenType.VOID,
}
return self.current.type in keyword_typesThe file /home/user/mquickjs-python/src/mquickjs_python/parser.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
74→ def _is_at_end(self) -> bool:
75→ """Check if we've reached the end of input."""
76→ return self.current.type == TokenType.EOF
77→
78→ def _is_keyword(self) -> bool:
79→ """Check if current token is a keyword (reserved word)."""
80→ # Keywords that can be used as property names in object literals
81→ keyword_types = {
82→ TokenType.IF, TokenType.ELSE, TokenType.FOR, TokenType.WHILE,
83→ TokenType.DO, TokenType.SWITCH, TokenType.CASE, TokenType.DEFAULT,
84→ TokenType.BREAK, TokenType.CONTINUE, TokenType.RETURN, TokenType.THROW,
85→ TokenType.TRY, TokenType.CATCH, TokenType.FINALLY, TokenType.FUNCTION,
86→ TokenType.VAR, TokenType.NEW, TokenType.DELETE, TokenType.TYPEOF,
87→ TokenType.IN, TokenType.OF, TokenType.INSTANCEOF, TokenType.THIS,
88→ TokenType.TRUE, TokenType.FALSE, TokenType.NULL, TokenType.VOID,
89→ }
90→ return self.current.type in keyword_types
91→
92→ def _peek_next(self) -> Token:
93→ """Peek at the next token without consuming it."""
94→ # Save current stateNow I also need to fix how we get the keyword name in _parse_property. The token.type.name.lower() should give us the right string:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('var a = {x: 1, if: 2}; a')
print(f'Result: {result}')
print(f'a.if: {ctx.eval(\"a[\\\"if\\\"]\")}')" 2>&1Exit code 1
File "<string>", line 6
print(f'a.if: {ctx.eval("a[\"if\"]")}')
^
SyntaxError: f-string expression part cannot include a backslashuv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('var a = {x: 1, if: 2}; a')
print('Result:', result)
" 2>&1Excellent! It works now. Let me run the full test suite and check test_language.js:
......xx............................ [ 81%] tests/test_string_regex.py ................... [ 86%] tests/test_vm.py ..................................................... [100%] ================== 379 passed, 8 xfailed, 1 xpassed in 6.57s ===================
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=5.0)
try:
ctx.eval(open('tests/test_language.js').read())
print('PASS')
except Exception as e:
print(f'ERROR: {type(e).__name__}: {e}')
" 2>&1uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/test_language.js').read()
lines = code.split('\n')
# Find the failing line
for i in range(1, len(lines)+1):
try:
Parser('\n'.join(lines[:i])).parse()
except Exception as e:
if 'property name' in str(e):
print(f'Fails at line {i}: {lines[i-1][:70]}')
break
" 2>&1The issue is now with a.if - accessing a property named if with dot notation. In JavaScript, you can use obj.if to access a property named "if". Let me check the parser for member expression:
{
"-n": true,
"output_mode": "content",
"path": "/home/user/mquickjs-python/src/mquickjs_python/parser.py",
"pattern": "MemberExpression"
}12: MemberExpression, CallExpression, NewExpression, 670: expr = MemberExpression(expr, Identifier(prop.value), computed=False) 675: expr = MemberExpression(expr, prop, computed=True)
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/parser.py",
"limit": 25,
"offset": 664
}664→ expr = self._parse_new_expression() 665→ 666→ while True: 667→ if self._match(TokenType.DOT): 668→ # Member access: a.b 669→ prop = self._expect(TokenType.IDENTIFIER, "Expected property name") 670→ expr = MemberExpression(expr, Identifier(prop.value), computed=False) 671→ elif self._match(TokenType.LBRACKET): 672→ # Computed member access: a[b] 673→ prop = self._parse_expression() 674→ self._expect(TokenType.RBRACKET, "Expected ']' after index") 675→ expr = MemberExpression(expr, prop, computed=True) 676→ elif self._match(TokenType.LPAREN): 677→ # Function call: f(args) 678→ args = self._parse_arguments() 679→ self._expect(TokenType.RPAREN, "Expected ')' after arguments") 680→ expr = CallExpression(expr, args) 681→ elif self._check(TokenType.PLUSPLUS, TokenType.MINUSMINUS): 682→ # Postfix increment/decrement 683→ op = self._advance().value 684→ expr = UpdateExpression(op, expr, prefix=False) 685→ else: 686→ break 687→ 688→ return expr <system-reminder> Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior. </system-reminder>
I see - at line 669, it expects TokenType.IDENTIFIER only. I need to also allow keywords after a dot:
while True:
if self._match(TokenType.DOT):
# Member access: a.b
prop = self._expect(TokenType.IDENTIFIER, "Expected property name")
expr = MemberExpression(expr, Identifier(prop.value), computed=False) while True:
if self._match(TokenType.DOT):
# Member access: a.b (keywords allowed as property names)
if self._check(TokenType.IDENTIFIER):
prop = self._advance()
expr = MemberExpression(expr, Identifier(prop.value), computed=False)
elif self._is_keyword():
# Keywords can be used as property names
prop_name = self.current.type.name.lower()
self._advance()
expr = MemberExpression(expr, Identifier(prop_name), computed=False)
else:
raise self._error("Expected property name")The file /home/user/mquickjs-python/src/mquickjs_python/parser.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
662→ def _parse_postfix_expression(self) -> Node:
663→ """Parse postfix expression (member access, calls, postfix ++/--)."""
664→ expr = self._parse_new_expression()
665→
666→ while True:
667→ if self._match(TokenType.DOT):
668→ # Member access: a.b (keywords allowed as property names)
669→ if self._check(TokenType.IDENTIFIER):
670→ prop = self._advance()
671→ expr = MemberExpression(expr, Identifier(prop.value), computed=False)
672→ elif self._is_keyword():
673→ # Keywords can be used as property names
674→ prop_name = self.current.type.name.lower()
675→ self._advance()
676→ expr = MemberExpression(expr, Identifier(prop_name), computed=False)
677→ else:
678→ raise self._error("Expected property name")
679→ elif self._match(TokenType.LBRACKET):
680→ # Computed member access: a[b]
681→ prop = self._parse_expression()
682→ self._expect(TokenType.RBRACKET, "Expected ']' after index")uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext()
result = ctx.eval('var a = {if: 42}; a.if')
print('Result:', result)
" 2>&1......xx............................ [ 81%] tests/test_string_regex.py ................... [ 86%] tests/test_vm.py ..................................................... [100%] ================== 379 passed, 8 xfailed, 1 xpassed in 6.78s ===================
Good - all tests still pass. Let me commit this progress and check test_language.js:
uv run python -c "
from mquickjs_python import JSContext
ctx = JSContext(time_limit=5.0)
try:
ctx.eval(open('tests/test_language.js').read())
print('PASS')
except Exception as e:
print(f'ERROR: {type(e).__name__}: {str(e)[:100]}')
" 2>&1uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/test_language.js').read()
lines = code.split('\n')
for i in range(1, len(lines)+1):
try:
Parser('\n'.join(lines[:i])).parse()
except Exception as e:
if 'Expected' in str(e):
print(f'Fails at line {i}: {lines[i-1][:70]}')
print(f'Error: {e}')
break
" 2>&1uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/test_language.js').read()
lines = code.split('\n')
# Try larger chunks
last_success = 0
for i in range(1, len(lines)+1):
try:
Parser('\n'.join(lines[:i])).parse()
last_success = i
except Exception as e:
if i - last_success > 5: # Skip normal incomplete code errors
print(f'Last success: line {last_success}')
print(f'Fails at line {i}:')
for j in range(max(last_success-2, 0), min(i+1, len(lines))):
print(f'{j+1}: {lines[j][:70]}')
print(f'Error: {e}')
break
" 2>&1Last success: line 4
Fails at line 10:
3: }
4:
5: function assert(actual, expected, message) {
6: function get_full_type(o) {
7: var type = typeof(o);
8: if (type === 'object') {
9: if (o === null)
10: return 'null';
11: if (o.constructor && o.constructor.name)
Error: SyntaxError: Expected '}'uv run python -c "
from mquickjs_python.parser import Parser
# Test the assert function alone
code = '''
function assert(actual, expected, message) {
function get_full_type(o) {
var type = typeof(o);
if (type === \"object\") {
if (o === null)
return \"null\";
if (o.constructor && o.constructor.name)
return o.constructor.name;
}
return type;
}
return true;
}
'''
Parser(code).parse()
print('PASS')
" 2>&1uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/test_language.js').read()
Parser(code).parse()
print('PASS')
" 2>&1Exit code 1
Traceback (most recent call last):
File "<string>", line 5, in <module>
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 114, in parse
stmt = self._parse_statement()
^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 163, in _parse_statement
return self._parse_function_declaration()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 389, in _parse_function_declaration
body = self._parse_block_statement()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 182, in _parse_block_statement
stmt = self._parse_statement()
^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 175, in _parse_statement
return self._parse_expression_statement()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 407, in _parse_expression_statement
expr = self._parse_expression()
^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 419, in _parse_expression
expr = self._parse_assignment_expression(exclude_in)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 450, in _parse_assignment_expression
right = self._parse_assignment_expression(exclude_in)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 441, in _parse_assignment_expression
expr = self._parse_conditional_expression(exclude_in)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 546, in _parse_conditional_expression
expr = self._parse_binary_expression(0, exclude_in)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 558, in _parse_binary_expression
left = self._parse_unary_expression()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 660, in _parse_unary_expression
return self._parse_postfix_expression()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 664, in _parse_postfix_expression
expr = self._parse_new_expression()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 708, in _parse_new_expression
return self._parse_primary_expression()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 756, in _parse_primary_expression
return self._parse_object_literal()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 789, in _parse_object_literal
self._expect(TokenType.RBRACE, "Expected '}' after object properties")
File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 71, in _expect
raise self._error(message)
mquickjs_python.errors.JSSyntaxError: SyntaxError: Expected '}' after object propertiesThe error is in parsing an object literal in _parse_object_literal. Let me search for the problematic object literal:
uv run python -c "
from mquickjs_python.parser import Parser
code = open('tests/test_language.js').read()
lines = code.split('\n')
# Find the exact line with the error
last_success = 0
for i in range(1, len(lines)+1):
try:
Parser('\n'.join(lines[:i])).parse()
last_success = i
except Exception as e:
if 'object properties' in str(e):
print(f'Last parsed line: {last_success}')
print(f'Error at line: {i}')
# Show the surrounding object
for j in range(max(0, last_success-5), min(i+3, len(lines))):
print(f'{j+1}: {lines[j]}')
break
" 2>&1Last parsed line: 240
Error at line: 287
236: function F(x)
237: {
238: this.x = x;
239: }
240:
241: function test_op2()
242: {
243: var a, b;
244: a = new Object;
245: a.x = 1;
246: assert(a.x, 1, "new");
247: b = new F(2);
248: assert(b.x, 2, "new");
249: assert((b instanceof F), true, "instanceof F");
250:
251: a = {x : 2};
252: assert(("x" in a), true, "in");
253: assert(("y" in a), false, "in");
254:
255: a = {};
256: assert((a instanceof Object), true, "instanceof Object");
257: assert((a instanceof String), false, "instanceof String");
258:
259: assert((typeof 1), "number", "typeof");
260: assert((typeof Object), "function", "typeof");
261: assert((typeof null), "object", "typeof");
262: assert((typeof unknown_var), "undefined", "typeof");
263:
264: a = {x: 1, y: 1};
265: assert((delete a.x), true, "delete");
266: assert(("x" in a), false, "delete in");
267:
268: a = {x: 1, if: 2};
269: assert(a.if, 2);
270:
271: a = {x: 1, y: 2, __proto__: { z: 3 }};
272: assert(a.x, 1);
273: assert(a.y, 2);
274: assert(Object.getPrototypeOf(a).z, 3);
275:
276: /* getter/setter/method */
277: b = 2;
278: a = {get x() { return b; }, set x(v) { b = v; }, f(v) { return v + 1 },
279: set: 10, get: 11 };
280: assert(a.x, 2);
281: a.x = 3;
282: assert(a.x, 3);
283: assert(a.f(3), 4);
284: assert(a.set, 10);
285: assert(a.get, 11);
286:
287: a = { set() { return 1; }, get() { return 2; }}
288: assert(a.set(), 1);
289: assert(a.get(), 2);
290: }I see the issue! Line 287 has { set() { return 1; }, get() { return 2; }} - this is using set and get as method names, not getter/setter modifiers. My parser is treating them as getter/setter.Let me also check line 278-279 which has both getter/setter syntax and regular properties named set and get.The issue is that the parser sees set and immediately treats it as a setter modifier, but it should check if what follows is ( (method shorthand) vs identifier (setter).Let me look at how I parse get/set:
I see the issue! { set() {...} } uses set as a method name, not a setter keyword. Let me fix the parser to distinguish:
{
"file_path": "/home/user/mquickjs-python/src/mquickjs_python/parser.py",
"limit": 40,
"offset": 788
} 788→ break
789→ self._expect(TokenType.RBRACE, "Expected '}' after object properties")
790→ return ObjectExpression(properties)
791→
792→ def _parse_property(self) -> Property:
793→ """Parse object property."""
794→ # Check for getter/setter
795→ kind = "init"
796→ if self._check(TokenType.IDENTIFIER):
797→ if self.current.value == "get":
798→ # Could be getter or property named "get"
799→ self._advance()
800→ if self._check(TokenType.IDENTIFIER, TokenType.STRING, TokenType.NUMBER):
801→ kind = "get"
802→ else:
803→ # It's a property named "get"
804→ key = Identifier("get")
805→ if self._match(TokenType.COLON):
806→ value = self._parse_assignment_expression()
807→ else:
808→ # Shorthand: {get}
809→ value = key
810→ return Property(key, value, "init", computed=False, shorthand=True)
811→ elif self.current.value == "set":
812→ self._advance()
813→ if self._check(TokenType.IDENTIFIER, TokenType.STRING, TokenType.NUMBER):
814→ kind = "set"
815→ else:
816→ key = Identifier("set")
817→ if self._match(TokenType.COLON):
818→ value = self._parse_assignment_expression()
819→ else:
820→ value = key
821→ return Property(key, value, "init", computed=False, shorthand=True)
822→
823→ # Parse key
824→ computed = False
825→ if self._match(TokenType.LBRACKET):
826→ key = self._parse_assignment_expression()
827→ self._expect(TokenType.RBRACKET, "Expected ']' after computed property name")
<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>
I see the issue! When checking for getter/setter at line 800, I check if the next token is IDENTIFIER, STRING, or NUMBER. But { set() {} } has ( after set, so it should be treated as a method named "set", not as a setter.But the check at line 800 only checks for property name tokens. If it's ( it falls through to the else which treats it as shorthand {get} or {set}.I need to also handle the method shorthand case:- set foo() {} - setter- set() {} - method named "set"- set: value - property named "set"Let me fix this:
def _parse_property(self) -> Property:
"""Parse object property."""
# Check for getter/setter
kind = "init"
if self._check(TokenType.IDENTIFIER):
if self.current.value == "get":
# Could be getter or property named "get"
self._advance()
if self._check(TokenType.IDENTIFIER, TokenType.STRING, TokenType.NUMBER):
kind = "get"
else:
# It's a property named "get"
key = Identifier("get")
if self._match(TokenType.COLON):
value = self._parse_assignment_expression()
else:
# Shorthand: {get}
value = key
return Property(key, value, "init", computed=False, shorthand=True)
elif self.current.value == "set":
self._advance()
if self._check(TokenType.IDENTIFIER, TokenType.STRING, TokenType.NUMBER):
kind = "set"
else:
key = Identifier("set")
if self._match(TokenType.COLON):
value = self._parse_assignment_expression()
else:
value = key
return Property(key, value, "init", computed=False, shorthand=True) def _parse_property(self) -> Property:
"""Parse object property."""
# Check for getter/setter
kind = "init"
if self._check(TokenType.IDENTIFIER):
if self.current.value == "get":
# Could be getter or property/method named "get"
self._advance()
if self._check(TokenType.IDENTIFIER, TokenType.STRING, TokenType.NUMBER, TokenType.LBRACKET):
# get propertyName() {} - it's a getter
kind = "get"
elif self._check(TokenType.LPAREN):
# get() {} - method shorthand named "get"
key = Identifier("get")
params = self._parse_function_params()
body = self._parse_block_statement()
value = FunctionExpression(None, params, body)
return Property(key, value, "init", computed=False)
else:
# get: value or {get} shorthand
key = Identifier("get")
if self._match(TokenType.COLON):
value = self._parse_assignment_expression()
else:
value = key
return Property(key, value, "init", computed=False, shorthand=True)
elif self.current.value == "set":
self._advance()
if self._check(TokenType.IDENTIFIER, TokenType.STRING, TokenType.NUMBER, TokenType.LBRACKET):
kind = "set"
elif self._check(TokenType.LPAREN):
# set() {} - method shorthand named "set"
key = Identifier("set")
params = self._parse_function_params()
body = self._parse_block_statement()
value = FunctionExpression(None, params, body)
return Property(key, value, "init", computed=False)
else:
key = Identifier("set")
if self._match(TokenType.COLON):
value = self._parse_assignment_expression()
else:
value = key
return Property(key, value, "init", computed=False, shorthand=True)The file /home/user/mquickjs-python/src/mquickjs_python/parser.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
788→ break
789→ self._expect(TokenType.RBRACE, "Expected '}' after object properties")
790→ return ObjectExpression(properties)
791→
792→ def _parse_property(self) -> Property:
793→ """Parse object property."""
794→ # Check for getter/setter
795→ kind = "init"
796→ if self._check(TokenType.IDENTIFIER):
797→ if self.current.value == "get":
798→ # Could be getter or property/method named "get"
799→ self._advance()
800→ if self._check(TokenType.IDENTIFIER, TokenType.STRING, TokenType.NUMBER, TokenType.LBRACKET):
801→ # get propertyName() {} - it's a getter
802→ kind = "get"
803→ elif self._check(TokenType.LPAREN):
804→ # get() {} - method shorthand named "get"
805→ key = Identifier("get")
806→ params = self._parse_function_params()
807→ body = self._parse_block_statement()
808→ value = FunctionExpression(None, params, body)
809→ return Property(key, value, "init", computed=False)
810→ else:
811→ # get: value or {get} shorthand
812→ key = Identifier("get")
813→ if self._match(TokenType.COLON):
814→ value = self._parse_assignment_expression()
815→ else:
816→ value = key
817→ return Property(key, value, "init", computed=False, shorthand=True)
818→ elif self.current.value == "set":
819→ self._advance()
820→ if self._check(TokenType.IDENTIFIER, TokenType.STRING, TokenType.NUMBER, TokenType.LBRACKET):
821→ kind = "set"
822→ elif self._check(TokenType.LPAREN):
823→ # set() {} - method shorthand named "set"
824→ key = Identifier("set")
825→ params = self._parse_function_params()
826→ body = self._parse_block_statement()
827→ value = FunctionExpression(None, params, body)
828→ return Property(key, value, "init", computed=False)
829→ else:
830→ key = Identifier("set")
831→ if self._match(TokenType.COLON):
832→ value = self._parse_assignment_expression()
833→ else:
834→ value = key
835→ return Property(key, value, "init", computed=False, shorthand=True)
836→
837→ # Parse key
838→ computed = False
839→ if self._match(TokenType.LBRACKET):