Claude Code transcript - page 8/12

   510→            name = frame.func.constants[arg]
   511→            if name in self.globals:
   512→                self.stack.append(js_typeof(self.globals[name]))
   513→            else:
   514→                self.stack.append("undefined")
   515→
   516→        elif op == OpCode.INSTANCEOF:
   517→            constructor = self.stack.pop()
   518→            obj = self.stack.pop()
   519→            # Check if constructor is callable
   520→            if not (isinstance(constructor, JSFunction) or
   521→                    (isinstance(constructor, JSObject) and hasattr(constructor, '_call_fn'))):
   522→                raise JSTypeError("Right-hand side of instanceof is not callable")
   523→
   524→            # Check prototype chain
   525→            if not isinstance(obj, JSObject):
   526→                self.stack.append(False)
   527→            else:
   528→                # Get constructor's prototype property
   529→                if isinstance(constructor, JSFunction) and hasattr(constructor, '_prototype'):
   530→                    proto = constructor._prototype
   531→                elif isinstance(constructor, JSObject) and hasattr(constructor, '_prototype'):
   532→                    proto = constructor._prototype
   533→                else:
   534→                    proto = constructor.get("prototype") if isinstance(constructor, JSObject) else None
   535→
   536→                # Walk the prototype chain
   537→                result = False
   538→                current = getattr(obj, '_prototype', None)
   539→                while current is not None:
   540→                    if current is proto:
   541→                        result = True
   542→                        break
   543→                    current = getattr(current, '_prototype', None)
   544→                self.stack.append(result)
   545→
   546→        elif op == OpCode.IN:
   547→            obj = self.stack.pop()
   548→            key = self.stack.pop()
   549→            if not isinstance(obj, JSObject):
   550→                raise JSTypeError("Cannot use 'in' operator on non-object")
   551→            key_str = to_string(key)
   552→            self.stack.append(obj.has(key_str))
   553→
   554→        # Control flow
   555→        elif op == OpCode.JUMP:
   556→            frame.ip = arg
   557→
   558→        elif op == OpCode.JUMP_IF_FALSE:
   559→            if not to_boolean(self.stack.pop()):

<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 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:
   520→            if not (isinstance(constructor, JSFunction) or
   521→                    (isinstance(constructor, JSObject) and hasattr(constructor, '_call_fn'))):
   522→                raise JSTypeError("Right-hand side of instanceof is not callable")
   523→
   524→            # Check prototype chain
   525→            if not isinstance(obj, JSObject):
   526→                self.stack.append(False)
   527→            else:
   528→                # Get constructor's prototype property
   529→                # For JSFunction, check _prototype attribute (if set and not None)
   530→                # For JSCallableObject and other constructors, use get("prototype")
   531→                proto = None
   532→                if isinstance(constructor, JSFunction) and getattr(constructor, '_prototype', None) is not None:
   533→                    proto = constructor._prototype
   534→                elif isinstance(constructor, JSObject):
   535→                    # Try get("prototype") first for callable objects, fall back to _prototype
   536→                    proto = constructor.get("prototype")
   537→                    if proto is None or proto is UNDEFINED:
   538→                        proto = getattr(constructor, '_prototype', None)
   539→
   540→                # Walk the prototype chain
   541→                result = False
   542→                current = getattr(obj, '_prototype', None)

151-
152-            if frame.ip >= len(bytecode):
153-                # End of function
154-                return self.stack.pop() if self.stack else UNDEFINED
155-
156-            op = OpCode(bytecode[frame.ip])
157-            frame.ip += 1
158-
159-            # Get argument if needed
160-            arg = None
161:            if op in (OpCode.JUMP, OpCode.JUMP_IF_FALSE, OpCode.JUMP_IF_TRUE, OpCode.TRY_START):
162-                # 16-bit little-endian argument for jumps
163-                low = bytecode[frame.ip]
164-                high = bytecode[frame.ip + 1]
165-                arg = low | (high << 8)
166-                frame.ip += 2
167-            elif op in (
168-                OpCode.LOAD_CONST, OpCode.LOAD_NAME, OpCode.STORE_NAME,
169-                OpCode.LOAD_LOCAL, OpCode.STORE_LOCAL,
170-                OpCode.LOAD_CLOSURE, OpCode.STORE_CLOSURE,
171-                OpCode.LOAD_CELL, OpCode.STORE_CELL,
--
603-            self._new_object(arg)
604-
605-        elif op == OpCode.THIS:
606-            self.stack.append(frame.this_value)
607-
608-        # Exception handling
609-        elif op == OpCode.THROW:
610-            exc = self.stack.pop()
611-            self._throw(exc)
612-
613:        elif op == OpCode.TRY_START:
614-            # arg is the catch handler offset
615-            self.exception_handlers.append((len(self.call_stack) - 1, arg))
616-
617:        elif op == OpCode.TRY_END:
618-            if self.exception_handlers:
619-                self.exception_handlers.pop()
620-
621-        elif op == OpCode.CATCH:
622-            # Exception is on stack
623-            pass
624-
625-        # Iteration
626-        elif op == OpCode.FOR_IN_INIT:
627-            obj = self.stack.pop()
--
1996-                    self.call_stack.pop()
1997-                    if len(self.stack) > stack_len:
1998-                        return self.stack.pop()
1999-                    return UNDEFINED
2000-
2001-                op = OpCode(bytecode[frame.ip])
2002-                frame.ip += 1
2003-
2004-                # Get argument if needed
2005-                arg = None
2006:                if op in (OpCode.JUMP, OpCode.JUMP_IF_FALSE, OpCode.JUMP_IF_TRUE, OpCode.TRY_START):
2007-                    low = bytecode[frame.ip]
2008-                    high = bytecode[frame.ip + 1]
2009-                    arg = low | (high << 8)
2010-                    frame.ip += 2
2011-                elif op in (
2012-                    OpCode.LOAD_CONST, OpCode.LOAD_NAME, OpCode.STORE_NAME,
2013-                    OpCode.LOAD_LOCAL, OpCode.STORE_LOCAL,
2014-                    OpCode.LOAD_CLOSURE, OpCode.STORE_CLOSURE,
2015-                    OpCode.LOAD_CELL, OpCode.STORE_CELL,
2016-                    OpCode.CALL, OpCode.CALL_METHOD, OpCode.NEW,

   170→                OpCode.LOAD_CLOSURE, OpCode.STORE_CLOSURE,
   171→                OpCode.LOAD_CELL, OpCode.STORE_CELL,
   172→                OpCode.CALL, OpCode.CALL_METHOD, OpCode.NEW,
   173→                OpCode.BUILD_ARRAY, OpCode.BUILD_OBJECT, OpCode.BUILD_REGEX,
   174→                OpCode.MAKE_CLOSURE, OpCode.TYPEOF_NAME,
   175→            ):
   176→                arg = bytecode[frame.ip]
   177→                frame.ip += 1
   178→
   179→            # Execute opcode
   180→            self._execute_opcode(op, arg, frame)
   181→
   182→            # Check if frame was popped (return)
   183→            if not self.call_stack:
   184→                break
   185→
   186→        return self.stack.pop() if self.stack else UNDEFINED
   187→
   188→    def _execute_opcode(self, op: OpCode, arg: Optional[int], frame: CallFrame) -> None:
   189→        """Execute a single opcode."""
   190→
   191→        # Stack operations
   192→        if op == OpCode.POP:
   193→            if self.stack:
   194→                self.stack.pop()
   195→
   196→        elif op == OpCode.DUP:
   197→            self.stack.append(self.stack[-1])
   198→
   199→        elif op == OpCode.DUP2:

<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>

2100-            cell_storage=cell_storage,
2101-            is_constructor_call=is_constructor,
2102-            new_target=new_target,
2103-        )
2104-        self.call_stack.append(frame)
2105-
2106-    def _new_object(self, arg_count: int) -> None:
2107-        """Create a new object with constructor."""
2108-        args = []
2109-        for _ in range(arg_count):
2110-            args.insert(0, self.stack.pop())
2111-        constructor = self.stack.pop()
2112-
2113-        if isinstance(constructor, JSFunction):
2114-            # Create new object
2115-            obj = JSObject()
2116-            # Set prototype from constructor's prototype property
2117-            if hasattr(constructor, '_prototype'):
2118-                obj._prototype = constructor._prototype
2119-            # Call constructor with new object as 'this'
2120-            # Mark this as a constructor call so RETURN knows to return the object
2121-            self._invoke_js_function(constructor, args, obj, is_constructor=True, new_target=obj)
2122-            # Don't push obj here - RETURN/RETURN_UNDEFINED will handle it
2123-        elif isinstance(constructor, JSObject) and hasattr(constructor, '_call_fn'):
2124-            # Built-in constructor (like Object, Array, RegExp)
2125-            result = constructor._call_fn(*args)
2126-            self.stack.append(result)
2127-        else:
2128-            raise JSTypeError(f"{constructor} is not a constructor")
2129-
2130:    def _throw(self, exc: JSValue) -> None:
2131-        """Throw an exception."""
2132-        if self.exception_handlers:
2133-            frame_idx, catch_ip = self.exception_handlers.pop()
2134-
2135-            # Unwind call stack
2136-            while len(self.call_stack) > frame_idx + 1:
2137-                self.call_stack.pop()
2138-
2139-            # Jump to catch handler
2140-            frame = self.call_stack[-1]
2141-            frame.ip = catch_ip
2142-
2143-            # Push exception value
2144-            self.stack.append(exc)
2145-        else:
2146-            # Uncaught exception
2147-            if isinstance(exc, str):
2148-                raise JSError(exc)
2149-            elif isinstance(exc, JSObject):
2150-                msg = exc.get("message")
2151-                raise JSError(to_string(msg) if msg else "Error")
2152-            else:
2153-                raise JSError(to_string(exc))

   140→            if mem_used > self.memory_limit:
   141→                raise MemoryLimitError("Memory limit exceeded")
   142→
   143→    def _execute(self) -> JSValue:
   144→        """Main execution loop."""
   145→        while self.call_stack:
   146→            self._check_limits()
   147→
   148→            frame = self.call_stack[-1]
   149→            func = frame.func
   150→            bytecode = func.bytecode
   151→
   152→            if frame.ip >= len(bytecode):
   153→                # End of function
   154→                return self.stack.pop() if self.stack else UNDEFINED
   155→
   156→            op = OpCode(bytecode[frame.ip])
   157→            frame.ip += 1
   158→
   159→            # Get argument if needed
   160→            arg = None
   161→            if op in (OpCode.JUMP, OpCode.JUMP_IF_FALSE, OpCode.JUMP_IF_TRUE, OpCode.TRY_START):
   162→                # 16-bit little-endian argument for jumps
   163→                low = bytecode[frame.ip]
   164→                high = bytecode[frame.ip + 1]
   165→                arg = low | (high << 8)
   166→                frame.ip += 2
   167→            elif op in (
   168→                OpCode.LOAD_CONST, OpCode.LOAD_NAME, OpCode.STORE_NAME,
   169→                OpCode.LOAD_LOCAL, OpCode.STORE_LOCAL,
   170→                OpCode.LOAD_CLOSURE, OpCode.STORE_CLOSURE,
   171→                OpCode.LOAD_CELL, OpCode.STORE_CELL,
   172→                OpCode.CALL, OpCode.CALL_METHOD, OpCode.NEW,
   173→                OpCode.BUILD_ARRAY, OpCode.BUILD_OBJECT, OpCode.BUILD_REGEX,
   174→                OpCode.MAKE_CLOSURE, OpCode.TYPEOF_NAME,
   175→            ):
   176→                arg = bytecode[frame.ip]
   177→                frame.ip += 1
   178→
   179→            # Execute opcode
   180→            self._execute_opcode(op, arg, frame)
   181→
   182→            # Check if frame was popped (return)
   183→            if not self.call_stack:
   184→                break
   185→
   186→        return self.stack.pop() if self.stack else UNDEFINED
   187→
   188→    def _execute_opcode(self, op: OpCode, arg: Optional[int], frame: CallFrame) -> None:
   189→        """Execute a single opcode."""

<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>

     1→"""Virtual machine for executing JavaScript bytecode."""
     2→
     3→import math
     4→import time
     5→from typing import Any, Dict, List, Optional, Tuple, Union
     6→from dataclasses import dataclass
     7→
     8→from .opcodes import OpCode
     9→from .compiler import CompiledFunction
    10→from .values import (
    11→    UNDEFINED, NULL, JSUndefined, JSNull, JSValue,
    12→    JSObject, JSArray, JSFunction, JSRegExp, JSTypedArray,
    13→    to_boolean, to_number, to_string, js_typeof,
    14→)
    15→from .errors import (
    16→    JSError, JSTypeError, JSReferenceError,
    17→    MemoryLimitError, TimeLimitError,
    18→)
    19→
    20→
    21→def js_round(x: float, ndigits: int = 0) -> float:
    22→    """Round using JavaScript-style 'round half away from zero' instead of Python's 'round half to even'."""
    23→    if ndigits == 0:
    24→        if x >= 0:
    25→            return math.floor(x + 0.5)
    26→        else:
    27→            return math.ceil(x - 0.5)
    28→    else:
    29→        multiplier = 10 ** ndigits
    30→        if x >= 0:

<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>

No matches found

48-        self._globals["Object"] = self._create_object_constructor()
49-        self._globals["Array"] = self._create_array_constructor()
50-        self._globals["Error"] = self._create_error_constructor("Error")
51:        self._globals["TypeError"] = self._create_error_constructor("TypeError")
52-        self._globals["SyntaxError"] = self._create_error_constructor("SyntaxError")
53-        self._globals["ReferenceError"] = self._create_error_constructor("ReferenceError")
54-        self._globals["RangeError"] = self._create_error_constructor("RangeError")
--
144-                    idx = int(prop)
145-                    if 0 <= idx < len(this_val._elements):
146-                        return True
147:                except (ValueError, TypeError):
148-                    pass
149-                return this_val.has(prop) or prop in this_val._getters or prop in this_val._setters
150-            if isinstance(this_val, JSObject):
--
409-        return arr_constructor
410-
411-    def _create_error_constructor(self, error_name: str) -> JSCallableObject:
412:        """Create an Error constructor (Error, TypeError, SyntaxError, etc.)."""
413-        # Add prototype first so it can be captured in closure
414-        error_prototype = JSObject()
415-        error_prototype.set("name", error_name)
--
686-            py_value = to_json_value(value)
687-            try:
688-                return json.dumps(py_value, separators=(',', ':'))
689:            except (TypeError, ValueError) as e:
690:                from .errors import JSTypeError
691:                raise JSTypeError(f"JSON.stringify: {e}")
692-
693-        json_obj.set("parse", parse_fn)
694-        json_obj.set("stringify", stringify_fn)

99:        self.globals: Dict[str, JSValue] = {}
252:            if name in self.globals:
253:                self.stack.append(self.globals[name])
259:            self.globals[name] = self.stack[-1]
312:            array_constructor = self.globals.get("Array")
320:            object_constructor = self.globals.get("Object")
511:            if name in self.globals:
512:                self.stack.append(js_typeof(self.globals[name]))

[Showing results with pagination = limit: 20, offset: 0]

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:
   175→            ):
   176→                arg = bytecode[frame.ip]
   177→                frame.ip += 1
   178→
   179→            # Execute opcode - wrap in try/except to catch Python JS exceptions
   180→            try:
   181→                self._execute_opcode(op, arg, frame)
   182→            except JSTypeError as e:
   183→                # Convert Python JSTypeError to JavaScript TypeError
   184→                self._handle_python_exception("TypeError", str(e))
   185→            except JSReferenceError as e:
   186→                # Convert Python JSReferenceError to JavaScript ReferenceError
   187→                self._handle_python_exception("ReferenceError", str(e))
   188→
   189→            # Check if frame was popped (return)
   190→            if not self.call_stack:
   191→                break
   192→
   193→        return self.stack.pop() if self.stack else UNDEFINED
   194→
   195→    def _execute_opcode(self, op: OpCode, arg: Optional[int], frame: CallFrame) -> None:

  2145→
  2146→            # Jump to catch handler
  2147→            frame = self.call_stack[-1]
  2148→            frame.ip = catch_ip
  2149→
  2150→            # Push exception value
  2151→            self.stack.append(exc)
  2152→        else:
  2153→            # Uncaught exception
  2154→            if isinstance(exc, str):
  2155→                raise JSError(exc)
  2156→            elif isinstance(exc, JSObject):
  2157→                msg = exc.get("message")
  2158→                raise JSError(to_string(msg) if msg else "Error")
  2159→            else:
  2160→                raise JSError(to_string(exc))
  2161→

<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 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:
  2149→
  2150→            # Push exception value
  2151→            self.stack.append(exc)
  2152→        else:
  2153→            # Uncaught exception
  2154→            if isinstance(exc, str):
  2155→                raise JSError(exc)
  2156→            elif isinstance(exc, JSObject):
  2157→                msg = exc.get("message")
  2158→                raise JSError(to_string(msg) if msg else "Error")
  2159→            else:
  2160→                raise JSError(to_string(exc))
  2161→
  2162→    def _handle_python_exception(self, error_type: str, message: str) -> None:
  2163→        """Convert a Python exception to a JavaScript exception and throw it."""
  2164→        # Get the error constructor from globals
  2165→        error_constructor = self.globals.get(error_type)
  2166→        if error_constructor and hasattr(error_constructor, '_call_fn'):
  2167→            # Create the error object using the constructor
  2168→            # Strip the "TypeError: " prefix from the message if present
  2169→            if message.startswith(f"{error_type}: "):
  2170→                message = message[len(error_type) + 2:]
  2171→            error_obj = error_constructor._call_fn(message)
  2172→            self._throw(error_obj)
  2173→        else:
  2174→            # Fall back to a plain object with message property
  2175→            error_obj = JSObject()
  2176→            error_obj.set("name", error_type)
  2177→            error_obj.set("message", message)
  2178→            self._throw(error_obj)
  2179→

None

None

None

Exception: JSError Error: Cannot set property '1.5' on array

Result: None

Simple: 3
Statement: 6
Try no error: None

No matches found

/home/user/mquickjs-python/src/mquickjs_python/parser.py-1-"""JavaScript parser - produces an AST from tokens."""
/home/user/mquickjs-python/src/mquickjs_python/parser.py-2-
/home/user/mquickjs-python/src/mquickjs_python/parser.py-3-from typing import List, Optional, Callable
/home/user/mquickjs-python/src/mquickjs_python/parser.py-4-from .lexer import Lexer
/home/user/mquickjs-python/src/mquickjs_python/parser.py-5-from .tokens import Token, TokenType
/home/user/mquickjs-python/src/mquickjs_python/parser.py-6-from .errors import JSSyntaxError
/home/user/mquickjs-python/src/mquickjs_python/parser.py-7-from .ast_nodes import (
/home/user/mquickjs-python/src/mquickjs_python/parser.py-8-    Node, Program, NumericLiteral, StringLiteral, BooleanLiteral, NullLiteral,
/home/user/mquickjs-python/src/mquickjs_python/parser.py-9-    RegexLiteral, Identifier, ThisExpression, ArrayExpression, ObjectExpression, Property,
/home/user/mquickjs-python/src/mquickjs_python/parser.py-10-    UnaryExpression, UpdateExpression, BinaryExpression, LogicalExpression,
/home/user/mquickjs-python/src/mquickjs_python/parser.py-11-    ConditionalExpression, AssignmentExpression, SequenceExpression,
/home/user/mquickjs-python/src/mquickjs_python/parser.py-12-    MemberExpression, CallExpression, NewExpression,
/home/user/mquickjs-python/src/mquickjs_python/parser.py-13-    ExpressionStatement, BlockStatement, EmptyStatement,
/home/user/mquickjs-python/src/mquickjs_python/parser.py-14-    VariableDeclaration, VariableDeclarator,
/home/user/mquickjs-python/src/mquickjs_python/parser.py-15-    IfStatement, WhileStatement, DoWhileStatement, ForStatement,
/home/user/mquickjs-python/src/mquickjs_python/parser.py-16-    ForInStatement, ForOfStatement, BreakStatement, ContinueStatement,
src/mquickjs_python/parser.py:17:    ReturnStatement, ThrowStatement, TryStatement, CatchClause,
/home/user/mquickjs-python/src/mquickjs_python/parser.py-18-    SwitchStatement, SwitchCase, LabeledStatement,
/home/user/mquickjs-python/src/mquickjs_python/parser.py-19-    FunctionDeclaration, FunctionExpression, ArrowFunctionExpression,
/home/user/mquickjs-python/src/mquickjs_python/parser.py-20-)
/home/user/mquickjs-python/src/mquickjs_python/parser.py-21-
/home/user/mquickjs-python/src/mquickjs_python/parser.py-22-
/home/user/mquickjs-python/src/mquickjs_python/parser.py-23-# Operator precedence (higher = binds tighter)
/home/user/mquickjs-python/src/mquickjs_python/parser.py-24-PRECEDENCE = {
src/mquickjs_python/parser.py-25-    "||": 1,
src/mquickjs_python/parser.py-26-    "&&": 2,
src/mquickjs_python/parser.py-27-    "|": 3,
src/mquickjs_python/parser.py-28-    "^": 4,
src/mquickjs_python/parser.py-29-    "&": 5,
src/mquickjs_python/parser.py-30-    "==": 6, "!=": 6, "===": 6, "!==": 6,
src/mquickjs_python/parser.py-31-    "<": 7, ">": 7, "<=": 7, ">=": 7, "in": 7, "instanceof": 7,
src/mquickjs_python/parser.py-32-    "<<": 8, ">>": 8, ">>>": 8,
src/mquickjs_python/parser.py-33-    "+": 9, "-": 9,
src/mquickjs_python/parser.py-34-    "*": 10, "/": 10, "%": 10,
src/mquickjs_python/parser.py-35-    "**": 11,
/home/user/mquickjs-python/src/mquickjs_python/parser.py-36-}
/home/user/mquickjs-python/src/mquickjs_python/parser.py-37-
--
/home/user/mquickjs-python/src/mquickjs_python/parser.py-322-        # Only consume identifier as label if on same line (ASI rule)
src/mquickjs_python/parser.py-323-        if self._check(TokenType.IDENTIFIER) and self.current.line == self.previous.line:
/home/user/mquickjs-python/src/mquickjs_python/parser.py-324-            label = Identifier(self._advance().value)
/home/user/mquickjs-python/src/mquickjs_python/parser.py-325-        self._consume_semicolon()
/home/user/mquickjs-python/src/mquickjs_python/parser.py-326-        return ContinueStatement(label)
/home/user/mquickjs-python/src/mquickjs_python/parser.py-327-
src/mquickjs_python/parser.py-328-    def _parse_return_statement(self) -> ReturnStatement:
/home/user/mquickjs-python/src/mquickjs_python/parser.py-329-        """Parse return statement."""
/home/user/mquickjs-python/src/mquickjs_python/parser.py-330-        argument = None
src/mquickjs_python/parser.py-331-        if not self._check(TokenType.SEMICOLON) and not self._check(TokenType.RBRACE):
/home/user/mquickjs-python/src/mquickjs_python/parser.py-332-            argument = self._parse_expression()
/home/user/mquickjs-python/src/mquickjs_python/parser.py-333-        self._consume_semicolon()
/home/user/mquickjs-python/src/mquickjs_python/parser.py-334-        return ReturnStatement(argument)
/home/user/mquickjs-python/src/mquickjs_python/parser.py-335-
src/mquickjs_python/parser.py-336-    def _parse_throw_statement(self) -> ThrowStatement:
/home/user/mquickjs-python/src/mquickjs_python/parser.py-337-        """Parse throw statement."""
/home/user/mquickjs-python/src/mquickjs_python/parser.py-338-        argument = self._parse_expression()
/home/user/mquickjs-python/src/mquickjs_python/parser.py-339-        self._consume_semicolon()
/home/user/mquickjs-python/src/mquickjs_python/parser.py-340-        return ThrowStatement(argument)
/home/user/mquickjs-python/src/mquickjs_python/parser.py-341-
src/mquickjs_python/parser.py:342:    def _parse_try_statement(self) -> TryStatement:
/home/user/mquickjs-python/src/mquickjs_python/parser.py-343-        """Parse try statement."""
/home/user/mquickjs-python/src/mquickjs_python/parser.py-344-        block = self._parse_block_statement()
/home/user/mquickjs-python/src/mquickjs_python/parser.py-345-        handler = None
/home/user/mquickjs-python/src/mquickjs_python/parser.py-346-        finalizer = None
/home/user/mquickjs-python/src/mquickjs_python/parser.py-347-
src/mquickjs_python/parser.py-348-        if self._match(TokenType.CATCH):
/home/user/mquickjs-python/src/mquickjs_python/parser.py-349-            self._expect(TokenType.LPAREN, "Expected '(' after 'catch'")
/home/user/mquickjs-python/src/mquickjs_python/parser.py-350-            param = self._expect(TokenType.IDENTIFIER, "Expected catch parameter")
/home/user/mquickjs-python/src/mquickjs_python/parser.py-351-            self._expect(TokenType.RPAREN, "Expected ')' after catch parameter")
/home/user/mquickjs-python/src/mquickjs_python/parser.py-352-            catch_body = self._parse_block_statement()
/home/user/mquickjs-python/src/mquickjs_python/parser.py-353-            handler = CatchClause(Identifier(param.value), catch_body)
/home/user/mquickjs-python/src/mquickjs_python/parser.py-354-
src/mquickjs_python/parser.py-355-        if self._match(TokenType.FINALLY):
/home/user/mquickjs-python/src/mquickjs_python/parser.py-356-            finalizer = self._parse_block_statement()
/home/user/mquickjs-python/src/mquickjs_python/parser.py-357-
src/mquickjs_python/parser.py-358-        if handler is None and finalizer is None:
/home/user/mquickjs-python/src/mquickjs_python/parser.py-359-            raise self._error("Missing catch or finally clause")
/home/user/mquickjs-python/src/mquickjs_python/parser.py-360-
src/mquickjs_python/parser.py:361:        return TryStatement(block, handler, finalizer)
/home/user/mquickjs-python/src/mquickjs_python/parser.py-362-
src/mquickjs_python/parser.py-363-    def _parse_switch_statement(self) -> SwitchStatement:
/home/user/mquickjs-python/src/mquickjs_python/parser.py-364-        """Parse switch statement."""
/home/user/mquickjs-python/src/mquickjs_python/parser.py-365-        self._expect(TokenType.LPAREN, "Expected '(' after 'switch'")
/home/user/mquickjs-python/src/mquickjs_python/parser.py-366-        discriminant = self._parse_expression()
/home/user/mquickjs-python/src/mquickjs_python/parser.py-367-        self._expect(TokenType.RPAREN, "Expected ')' after switch expression")
/home/user/mquickjs-python/src/mquickjs_python/parser.py-368-        self._expect(TokenType.LBRACE, "Expected '{' before switch body")
/home/user/mquickjs-python/src/mquickjs_python/parser.py-369-
src/mquickjs_python/parser.py-370-        cases: List[SwitchCase] = []
src/mquickjs_python/parser.py-371-        while not self._check(TokenType.RBRACE) and not self._is_at_end():
/home/user/mquickjs-python/src/mquickjs_python/parser.py-372-            test = None
src/mquickjs_python/parser.py-373-            if self._match(TokenType.CASE):
/home/user/mquickjs-python/src/mquickjs_python/parser.py-374-                test = self._parse_expression()
src/mquickjs_python/parser.py-375-            elif self._match(TokenType.DEFAULT):
/home/user/mquickjs-python/src/mquickjs_python/parser.py-376-                pass
src/mquickjs_python/parser.py-377-            else:
/home/user/mquickjs-python/src/mquickjs_python/parser.py-378-                raise self._error("Expected 'case' or 'default'")
/home/user/mquickjs-python/src/mquickjs_python/parser.py-379-
src/mquickjs_python/parser.py-380-            self._expect(TokenType.COLON, "Expected ':' after case expression")
/home/user/mquickjs-python/src/mquickjs_python/parser.py-381-
--
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-1-"""Bytecode compiler - compiles AST to bytecode."""
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-2-
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-3-from typing import List, Dict, Any, Optional, Tuple
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-4-from dataclasses import dataclass, field
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-5-from .ast_nodes import (
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-6-    Node, Program, NumericLiteral, StringLiteral, BooleanLiteral, NullLiteral,
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-7-    RegexLiteral, Identifier, ThisExpression, ArrayExpression, ObjectExpression, Property,
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-8-    UnaryExpression, UpdateExpression, BinaryExpression, LogicalExpression,
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-9-    ConditionalExpression, AssignmentExpression, SequenceExpression,
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-10-    MemberExpression, CallExpression, NewExpression,
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-11-    ExpressionStatement, BlockStatement, EmptyStatement,
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-12-    VariableDeclaration, VariableDeclarator,
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-13-    IfStatement, WhileStatement, DoWhileStatement, ForStatement,
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-14-    ForInStatement, ForOfStatement, BreakStatement, ContinueStatement,
src/mquickjs_python/compiler.py:15:    ReturnStatement, ThrowStatement, TryStatement, CatchClause,
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-16-    SwitchStatement, SwitchCase, LabeledStatement,
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-17-    FunctionDeclaration, FunctionExpression, ArrowFunctionExpression,
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-18-)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-19-from .opcodes import OpCode
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-20-from .values import UNDEFINED
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-21-
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-22-
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-23-@dataclass
src/mquickjs_python/compiler.py-24-class CompiledFunction:
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-25-    """A compiled function."""
src/mquickjs_python/compiler.py-26-    name: str
src/mquickjs_python/compiler.py-27-    params: List[str]
src/mquickjs_python/compiler.py-28-    bytecode: bytes
src/mquickjs_python/compiler.py-29-    constants: List[Any]
src/mquickjs_python/compiler.py-30-    locals: List[str]
src/mquickjs_python/compiler.py-31-    num_locals: int
src/mquickjs_python/compiler.py-32-    free_vars: List[str] = field(default_factory=list)  # Variables captured from outer scope
src/mquickjs_python/compiler.py-33-    cell_vars: List[str] = field(default_factory=list)  # Local variables that are captured by inner functions
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-34-
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-35-
--
src/mquickjs_python/compiler.py-191-        def visit(node):
src/mquickjs_python/compiler.py-192-            if isinstance(node, (FunctionDeclaration, FunctionExpression, ArrowFunctionExpression)):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-193-                # Found inner function - check what variables it uses
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-194-                inner_captured = self._find_free_vars_in_function(node, locals_set)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-195-                captured.update(inner_captured)
src/mquickjs_python/compiler.py-196-            elif isinstance(node, BlockStatement):
src/mquickjs_python/compiler.py-197-                for stmt in node.body:
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-198-                    visit(stmt)
src/mquickjs_python/compiler.py-199-            elif isinstance(node, IfStatement):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-200-                visit(node.consequent)
src/mquickjs_python/compiler.py-201-                if node.alternate:
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-202-                    visit(node.alternate)
src/mquickjs_python/compiler.py-203-            elif isinstance(node, WhileStatement):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-204-                visit(node.body)
src/mquickjs_python/compiler.py-205-            elif isinstance(node, DoWhileStatement):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-206-                visit(node.body)
src/mquickjs_python/compiler.py-207-            elif isinstance(node, ForStatement):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-208-                visit(node.body)
src/mquickjs_python/compiler.py-209-            elif isinstance(node, ForInStatement):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-210-                visit(node.body)
src/mquickjs_python/compiler.py:211:            elif isinstance(node, TryStatement):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-212-                visit(node.block)
src/mquickjs_python/compiler.py-213-                if node.handler:
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-214-                    visit(node.handler.body)
src/mquickjs_python/compiler.py-215-                if node.finalizer:
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-216-                    visit(node.finalizer)
src/mquickjs_python/compiler.py-217-            elif isinstance(node, SwitchStatement):
src/mquickjs_python/compiler.py-218-                for case in node.cases:
src/mquickjs_python/compiler.py-219-                    for stmt in case.consequent:
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-220-                        visit(stmt)
src/mquickjs_python/compiler.py-221-            elif isinstance(node, LabeledStatement):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-222-                visit(node.body)
src/mquickjs_python/compiler.py-223-            elif hasattr(node, '__dict__'):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-224-                # For expression nodes (e.g., arrow function expression body)
src/mquickjs_python/compiler.py-225-                for value in node.__dict__.values():
src/mquickjs_python/compiler.py-226-                    if isinstance(value, Node):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-227-                        visit(value)
src/mquickjs_python/compiler.py-228-                    elif isinstance(value, list):
src/mquickjs_python/compiler.py-229-                        for item in value:
src/mquickjs_python/compiler.py-230-                            if isinstance(item, Node):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-231-                                visit(item)
--
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-612-            # Emit pending finally blocks before the continue
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-613-            self._emit_pending_finally_blocks()
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-614-
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-615-            pos = self._emit_jump(OpCode.JUMP)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-616-            ctx.continue_jumps.append(pos)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-617-
src/mquickjs_python/compiler.py-618-        elif isinstance(node, ReturnStatement):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-619-            # Emit pending finally blocks before the return
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-620-            self._emit_pending_finally_blocks()
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-621-
src/mquickjs_python/compiler.py-622-            if node.argument:
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-623-                self._compile_expression(node.argument)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-624-                self._emit(OpCode.RETURN)
src/mquickjs_python/compiler.py-625-            else:
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-626-                self._emit(OpCode.RETURN_UNDEFINED)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-627-
src/mquickjs_python/compiler.py-628-        elif isinstance(node, ThrowStatement):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-629-            self._compile_expression(node.argument)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-630-            self._emit(OpCode.THROW)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-631-
src/mquickjs_python/compiler.py:632:        elif isinstance(node, TryStatement):
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-633-            # Push TryContext if there's a finally block so break/continue/return
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-634-            # can inline the finally code
src/mquickjs_python/compiler.py-635-            if node.finalizer:
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-636-                self.try_stack.append(TryContext(finalizer=node.finalizer))
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-637-
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-638-            # Try block
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-639-            try_start = self._emit_jump(OpCode.TRY_START)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-640-
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-641-            self._compile_statement(node.block)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-642-            self._emit(OpCode.TRY_END)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-643-
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-644-            # Jump past exception handler to normal finally
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-645-            jump_to_finally = self._emit_jump(OpCode.JUMP)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-646-
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-647-            # Exception handler
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-648-            self._patch_jump(try_start)
src/mquickjs_python/compiler.py-649-            if node.handler:
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-650-                # Has catch block
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-651-                self._emit(OpCode.CATCH)
/home/user/mquickjs-python/src/mquickjs_python/compiler.py-6

... [43 lines truncated] ...

49:    try {
150:    try {
227:    try {
601:    try {
758:    try {

    45→
    46→function assert_throws(expected_error, func)
    47→{
    48→    var err = false;
    49→    try {
    50→        func();
    51→    } catch(e) {
    52→        err = true;
    53→        if (!(e instanceof expected_error)) {
    54→            // Should output the source file and line number and extract
    55→            //   the expression from the assert_throws() call
    56→            throw_error("unexpected exception type");
    57→            return;
    58→        }
    59→    }
    60→    if (!err) {
    61→        // Should output the source file and line number and extract
    62→        //   the expression from the assert_throws() call
    63→        throw_error("expected exception");
    64→    }
    65→}
    66→
    67→function my_func(a, b)
    68→{
    69→    return a + b;
    70→}
    71→
    72→function test_function()
    73→{
    74→    function f(a, b) {

<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>

'TypeError caught'

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

No matches found

/home/user/mquickjs-python/src/mquickjs_python/vm.py-980-                "substring", "slice", "split", "toLowerCase", "toUpperCase",
/home/user/mquickjs-python/src/mquickjs_python/vm.py-981-                "trim", "trimStart", "trimEnd", "concat", "repeat", "startsWith", "endsWith",
/home/user/mquickjs-python/src/mquickjs_python/vm.py-982-                "includes", "replace", "replaceAll", "match", "search", "toString",
/home/user/mquickjs-python/src/mquickjs_python/vm.py-983-            ]
src/mquickjs_python/vm.py-984-            if key_str in string_methods:
/home/user/mquickjs-python/src/mquickjs_python/vm.py-985-                return self._make_string_method(obj, key_str)
/home/user/mquickjs-python/src/mquickjs_python/vm.py-986-            return UNDEFINED
/home/user/mquickjs-python/src/mquickjs_python/vm.py-987-
src/mquickjs_python/vm.py-988-        if isinstance(obj, (int, float)):
/home/user/mquickjs-python/src/mquickjs_python/vm.py-989-            # Number methods
src/mquickjs_python/vm.py:990:            if key_str in ("toFixed", "toString", "toExponential", "toPrecision", "valueOf"):
/home/user/mquickjs-python/src/mquickjs_python/vm.py-991-                return self._make_number_method(obj, key_str)
/home/user/mquickjs-python/src/mquickjs_python/vm.py-992-            return UNDEFINED
/home/user/mquickjs-python/src/mquickjs_python/vm.py-993-
/home/user/mquickjs-python/src/mquickjs_python/vm.py-994-        # Python callable (including JSBoundMethod)
src/mquickjs_python/vm.py-995-        if callable(obj):
src/mquickjs_python/vm.py-996-            if key_str in ("call", "apply", "bind"):
/home/user/mquickjs-python/src/mquickjs_python/vm.py-997-                return self._make_callable_method(obj, key_str)
/home/user/mquickjs-python/src/mquickjs_python/vm.py-998-            return UNDEFINED
/home/user/mquickjs-python/src/mquickjs_python/vm.py-999-
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1000-        return UNDEFINED
--
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1437-            return re.exec(string)
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1438-
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1439-        methods = {
src/mquickjs_python/vm.py-1440-            "test": test_fn,
src/mquickjs_python/vm.py-1441-            "exec": exec_fn,
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1442-        }
src/mquickjs_python/vm.py-1443-        return methods.get(method, lambda *args: UNDEFINED)
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1444-
src/mquickjs_python/vm.py-1445-    def _make_number_method(self, n: float, method: str) -> Any:
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1446-        """Create a bound number method."""
src/mquickjs_python/vm.py:1447:        def toFixed(*args):
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1448-            digits = int(to_number(args[0])) if args else 0
src/mquickjs_python/vm.py-1449-            if digits < 0 or digits > 100:
src/mquickjs_python/vm.py:1450:                raise JSReferenceError("toFixed() digits out of range")
src/mquickjs_python/vm.py-1451-            return f"{n:.{digits}f}"
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1452-
src/mquickjs_python/vm.py-1453-        def toString(*args):
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1454-            radix = int(to_number(args[0])) if args else 10
src/mquickjs_python/vm.py-1455-            if radix < 2 or radix > 36:
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1456-                raise JSReferenceError("toString() radix must be between 2 and 36")
src/mquickjs_python/vm.py-1457-            if radix == 10:
src/mquickjs_python/vm.py-1458-                if isinstance(n, float) and n.is_integer():
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1459-                    return str(int(n))
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1460-                return str(n)
--
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1558-                    decimal_places = precision - 1 - exp
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1559-                rounded = js_round(abs_n, decimal_places)
src/mquickjs_python/vm.py-1560-                if decimal_places <= 0:
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1561-                    return f"{sign}{int(rounded)}"
src/mquickjs_python/vm.py-1562-                return f"{sign}{rounded:.{decimal_places}f}"
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1563-
src/mquickjs_python/vm.py-1564-        def valueOf(*args):
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1565-            return n
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1566-
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1567-        methods = {
src/mquickjs_python/vm.py:1568:            "toFixed": toFixed,
src/mquickjs_python/vm.py-1569-            "toString": toString,
src/mquickjs_python/vm.py-1570-            "toExponential": toExponential,
src/mquickjs_python/vm.py-1571-            "toPrecision": toPrecision,
src/mquickjs_python/vm.py-1572-            "valueOf": valueOf,
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1573-        }
src/mquickjs_python/vm.py-1574-        return methods.get(method, lambda *args: UNDEFINED)
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1575-
src/mquickjs_python/vm.py-1576-    def _number_to_base(self, n: float, radix: int) -> str:
/home/user/mquickjs-python/src/mquickjs_python/vm.py-1577-        """Convert number to string in given base."""
src/mquickjs_python/vm.py-1578-        if n != int(n):

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:
  1443→        return methods.get(method, lambda *args: UNDEFINED)
  1444→
  1445→    def _make_number_method(self, n: float, method: str) -> Any:
  1446→        """Create a bound number method."""
  1447→        def toFixed(*args):
  1448→            digits = int(to_number(args[0])) if args else 0
  1449→            if digits < 0 or digits > 100:
  1450→                raise JSReferenceError("toFixed() digits out of range")
  1451→            # Use JavaScript-style rounding (round half away from zero)
  1452→            rounded = js_round(n, digits)
  1453→            return f"{rounded:.{digits}f}"
  1454→
  1455→        def toString(*args):
  1456→            radix = int(to_number(args[0])) if args else 10
  1457→            if radix < 2 or radix > 36:

1.125.toFixed(2) = '1.13' (expected 1.13)
0.5.toFixed(0) = '1' (expected 1)
1.5.toFixed(0) = '2' (expected 2)
2.5.toFixed(0) = '3' (expected 3)

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:
  1443→        return methods.get(method, lambda *args: UNDEFINED)
  1444→
  1445→    def _make_number_method(self, n: float, method: str) -> Any:
  1446→        """Create a bound number method."""
  1447→        def toFixed(*args):
  1448→            digits = int(to_number(args[0])) if args else 0
  1449→            if digits < 0 or digits > 100:
  1450→                raise JSReferenceError("toFixed() digits out of range")
  1451→            # Use JavaScript-style rounding (round half away from zero)
  1452→            rounded = js_round(n, digits)
  1453→            result = f"{rounded:.{digits}f}"
  1454→            # Handle negative zero: if n was negative but rounded to 0, keep the sign
  1455→            if n < 0 or (n == 0 and math.copysign(1, n) == -1):
  1456→                if rounded == 0:
  1457→                    result = "-" + result.lstrip("-")
  1458→            return result
  1459→
  1460→        def toString(*args):
  1461→            radix = int(to_number(args[0])) if args else 10
  1462→            if radix < 2 or radix > 36:

(-0).toFixed(0) = '-0' (expected -0)
(-0.001).toFixed(0) = '-0' (expected -0)
(1.125).toFixed(2) = '1.13' (expected 1.13)

No matches found

397-
398-    // var ch = "\udbc4\u{de34}";
399-    // assert(ch.slice(0, 2), "\udbc4\u{de34}", "slice 1");
400-    // assert(ch.slice(0, 1), "\udbc4", "slice 1");
401-    // assert(ch.slice(1, 2), "\u{de34}", "slice 1");
402-
403-    // assert("\udbc4" + "\u{de34}", "\u{101234}", "concat 3");
404-    // assert("\udbc4" + "o\u{de34}", "\udbc4o\u{de34}", "concat 4");
405-
406-    // assert(str[0], "h", "char 1");
407-    // assert(str[1], "é", "char 2");
408-    // assert(str[3], "\u{dbc4}", "char 3");
409-    // assert(str[4], "\u{de34}", "char 4");
410-    // assert(str.charCodeAt(3), 0xdbc4, "char 4");
411-    // assert("€"[0], "€", "char 5");
412-    // assert("\u{101234}"[0], "\u{dbc4}", "char 6");
413-    // assert("\u{101234}"[1], "\u{de34}", "char 6");
414-
415-    // assert("\udbc4" <= "\udbc4", true);
416-    // assert("\udbc3" < "\u{101234}", true);
417-    // assert("\udbc4" < "\u{101234}", true);
418-    // assert("\udbc5" > "\u{101234}", true);
419-
420-    // assert("\u{101234}" > "\udbc3", true);
421-    // assert("\u{101234}" > "\udbc4", true);
422-    // assert("\u{101234}" < "\udbc5", true);
423-
424-    // assert("\u{101233}" < "\u{101234}", true);
425-}
426-
427-function test_math()
428-{
429-    var a;
430-    a = 1.4;
431-    assert(Math.floor(a), 1);
432-    assert(Math.ceil(a), 2);
433-    assert(Math.imul(0x12345678, 123), -1088058456);
434-    assert(Math.fround(0.1), 0.10000000149011612);
435-}
436-
437:function test_number()
438-{
439-    assert(+"  123   ", 123);
440-    assert(+"0b111", 7);
441-    assert(+"0o123", 83);
442-    
443-    assert(parseInt("123"), 123);
444-    assert(parseInt("  123r"), 123);
445-    assert(parseInt("0x123"), 0x123);
446-    assert(parseInt("0o123"), 0);
447-    assert(parseFloat("0x1234"), 0);
448-    assert(parseFloat("Infinity"), Infinity);
449-    assert(parseFloat("-Infinity"), -Infinity);
450-    assert(parseFloat("123.2"), 123.2);
451-    assert(parseFloat("123.2e3"), 123200);
452-
453-    assert((25).toExponential(), "2.5e+1");
454-    assert((25).toExponential(0), "3e+1");
455-    assert((-25).toExponential(0), "-3e+1");
456-    assert((2.5).toPrecision(1), "3");
457-    assert((-2.5).toPrecision(1), "-3");
458-    assert((25).toPrecision(1), "3e+1");
459-    assert((1.125).toFixed(2), "1.13");
460-    assert((-1.125).toFixed(2), "-1.13");
461-    assert((-1e-10).toFixed(0), "-0");
462-}
463-
464-function test_global_eval()
465-{
466-    var r, g_eval = (1,eval);
467-
468-    r = g_eval("1+1;");
469-    assert(r, 2, "eval");
470-
471-    /* z is created as a global variable */
472-    r = g_eval("var z=2; z;");
473-    assert(r, 2, "eval");
474-    assert(z, 2);
475-    
476-    assert(g_eval("if (1) 2; else 3;"), 2);
477-    assert(g_eval("if (0) 2; else 3;"), 3);

parseInt: function
parseFloat: function
toExponential: function
toPrecision: function
toFixed: function

     1→"use strict";
     2→
     3→function throw_error(msg) {
     4→    throw Error(msg);
     5→}
     6→
     7→function assert(actual, expected, message) {
     8→    function get_full_type(o) {
     9→        var type = typeof(o);
    10→        if (type === 'object') {
    11→            if (o === null)
    12→                return 'null';
    13→            if (o.constructor && o.constructor.name)
    14→                return o.constructor.name;
    15→        }
    16→        return type;
    17→    }
    18→
    19→    if (arguments.length == 1)
    20→        expected = true;
    21→
    22→    if (typeof actual === typeof expected) {
    23→        if (actual === expected) {
    24→            if (actual !== 0 || (1 / actual) === (1 / expected))
    25→                return;
    26→        }
    27→        if (typeof actual === 'number') {
    28→            if (isNaN(actual) && isNaN(expected))
    29→                return true;
    30→        }
    31→        if (typeof actual === 'object') {
    32→            if (actual !== null && expected !== null
    33→            &&  actual.constructor === expected.constructor
    34→            &&  actual.toString() === expected.toString())
    35→                return;
    36→        }
    37→    }
    38→    // Should output the source file and line number and extract
    39→    //   the expression from the assert call
    40→    throw_error("assertion failed: got " +
    41→                get_full_type(actual) + ":|" + actual + "|, expected " +
    42→                get_full_type(expected) + ":|" + expected + "|" +
    43→                (message ? " (" + message + ")" : ""));
    44→}
    45→
    46→function assert_throws(expected_error, func)
    47→{
    48→    var err = false;
    49→    try {
    50→        func();

<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>

271:    assert([1, 2, 3, 4].forEach(function(val, k) { log += val; assert(k, (val - 1)); }), void 0);

all number assertions passed

all number method assertions passed

    72→function test_function()
    73→{
    74→    function f(a, b) {
    75→        var i, tab = [];
    76→        tab.push(this);
    77→        for(i = 0; i < arguments.length; i++)
    78→            tab.push(arguments[i]);
    79→        return tab;
    80→    }
    81→    function constructor1(a) {
    82→        this.x = a;
    83→    }
    84→    
    85→    var r, g;
    86→    
    87→    r = my_func.call(null, 1, 2);
    88→    assert(r, 3, "call");
    89→
    90→    r = my_func.apply(null, ["abc", 2]);
    91→    assert(r, "abc2", "apply");
    92→
    93→    r = new Function("a", "b", "return a + b;");
    94→    assert(r(2,3), 5, "function");
    95→
    96→    g = f.bind(1, 2);
    97→//    assert(g.length, 1);
    98→//    assert(g.name, "bound f");
    99→    assert(g(3).toString(), "1,2,3");
   100→
   101→    if (0) {
   102→    g = constructor1.bind(null, 1);
   103→    r = new g();
   104→    assert(r.x, 1);
   105→    }
   106→}
   107→
   108→function test()
   109→{
   110→    var r, a, b, c, err;
   111→
   112→    r = Error("hello");
   113→    assert(r.message, "hello", "Error");
   114→
   115→    a = new Object();
   116→    a.x = 1;
   117→    assert(a.x, 1, "Object");
   118→
   119→    assert(Object.prototype.constructor, Object, "constructor");
   120→    assert(Object.getPrototypeOf(a), Object.prototype, "getPrototypeOf");
   121→    Object.defineProperty(a, "y", { value: 3, writable: true, configurable: true, enumerable: true });

<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>

my_func.call result: 3

my_func.apply result: abc2

assert works

test_function passed

Error at line 3:
  function throw_error(msg) {
  Error: SyntaxError: Expected '}'

"use strict";$
$
function throw_error(msg) {$
    throw Error(msg);$
}$
$
function assert(actual, expected, message) {$
    function get_full_type(o) {$
        var type = typeof(o);$
        if (type === 'object') {$

loaded

File length: 24022
File starts with: '"use strict";\n\nfunction throw_error(msg) {\n    thr'
Failed to load: Error: undefined is not a function

1:"use strict";
133:*/
158:*/
204:*/
773:var poisoned_number = {
797:*/
835:test();
836:test_string();
837:test_string2();
838:test_array();
839:test_array_ext();
840:test_enum();
841:test_function();
842:test_number();
843:test_math();
844:test_typed_array();
845:test_global_eval();
846:test_json();
847:test_regexp();
848:test_line_column_numbers();
849:test_large_eval_parse_stack();

   108→function test()
   109→{
   110→    var r, a, b, c, err;
   111→
   112→    r = Error("hello");
   113→    assert(r.message, "hello", "Error");
   114→
   115→    a = new Object();
   116→    a.x = 1;
   117→    assert(a.x, 1, "Object");
   118→
   119→    assert(Object.prototype.constructor, Object, "constructor");
   120→    assert(Object.getPrototypeOf(a), Object.prototype, "getPrototypeOf");
   121→    Object.defineProperty(a, "y", { value: 3, writable: true, configurable: true, enumerable: true });
   122→    assert(a.y, 3, "defineProperty");
   123→
   124→    Object.defineProperty(a, "z", { get: function () { return 4; }, set: function(val) { this.z_val = val; }, configurable: true, enumerable: true });
   125→    assert(a.z, 4, "get");
   126→    a.z = 5;
   127→    assert(a.z_val, 5, "set");
   128→/*
   129→    a = { get z() { return 4; }, set z(val) { this.z_val = val; } };
   130→    assert(a.z, 4, "get");
   131→    a.z = 5;
   132→    assert(a.z_val, 5, "set");
   133→*/
   134→    a = {};
   135→    b = Object.create(a);
   136→    assert(Object.getPrototypeOf(b), a, "create");
   137→    c = {u:2};
   138→    Object.setPrototypeOf(a, c);
   139→    assert(Object.getPrototypeOf(a), c, "setPrototypeOf");
   140→    
   141→    a={};
   142→    assert(a.toString(), "[object Object]", "toString");
   143→    assert(Object.prototype.toString.call(1), "[object Number]", "toString");
   144→/*
   145→    a={x:1};
   146→    assert(Object.isExtensible(a), true, "extensible");
   147→    Object.preventExtensions(a);
   148→
   149→    err = false;
   150→    try {
   151→        a.y = 2;
   152→    } catch(e) {
   153→        err = true;
   154→    }
   155→    assert(Object.isExtensible(a), false, "extensible");
   156→    assert(typeof a.y, "undefined", "extensible");
   157→    assert(err);

<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>

Functions loaded successfully
✓ test
✓ test_string
✓ test_string2
✓ test_array
✓ test_array_ext
✓ test_enum
✓ test_function
✓ test_number
✓ test_math
✗ test_typed_array: Error: undefined is not a function
✗ test_global_eval: Error: z is not defined
✓ test_json
✗ test_regexp: Invalid control character escape

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

No matches found

426-
427-function test_math()
428-{
429-    var a;
430-    a = 1.4;
431-    assert(Math.floor(a), 1);
432-    assert(Math.ceil(a), 2);
433-    assert(Math.imul(0x12345678, 123), -1088058456);
434-    assert(Math.fround(0.1), 0.10000000149011612);
435-}
436-
437-function test_number()
438-{
439-    assert(+"  123   ", 123);
440-    assert(+"0b111", 7);
441-    assert(+"0o123", 83);
442-    
443-    assert(parseInt("123"), 123);
444-    assert(parseInt("  123r"), 123);
445-    assert(parseInt("0x123"), 0x123);
446-    assert(parseInt("0o123"), 0);
447-    assert(parseFloat("0x1234"), 0);
448-    assert(parseFloat("Infinity"), Infinity);
449-    assert(parseFloat("-Infinity"), -Infinity);
450-    assert(parseFloat("123.2"), 123.2);
451-    assert(parseFloat("123.2e3"), 123200);
452-
453-    assert((25).toExponential(), "2.5e+1");
454-    assert((25).toExponential(0), "3e+1");
455-    assert((-25).toExponential(0), "-3e+1");
456-    assert((2.5).toPrecision(1), "3");
457-    assert((-2.5).toPrecision(1), "-3");
458-    assert((25).toPrecision(1), "3e+1");
459-    assert((1.125).toFixed(2), "1.13");
460-    assert((-1.125).toFixed(2), "-1.13");
461-    assert((-1e-10).toFixed(0), "-0");
462-}
463-
464-function test_global_eval()
465-{
466-    var r, g_eval = (1,eval);
467-
468-    r = g_eval("1+1;");
469-    assert(r, 2, "eval");
470-
471-    /* z is created as a global variable */
472-    r = g_eval("var z=2; z;");
473-    assert(r, 2, "eval");
474-    assert(z, 2);
475-    
476-    assert(g_eval("if (1) 2; else 3;"), 2);
477-    assert(g_eval("if (0) 2; else 3;"), 3);
478-
479-    z = 2;
480-    assert(g_eval("z"), 2);
481-
482-    g_eval("z = 3");
483-    assert(z, 3);
484-}
485-
486:function test_typed_array()
487-{
488-    var buffer, a, i;
489-
490-    a = new Uint8Array(4);
491-    assert(a.length, 4);
492-    for(i = 0; i < a.length; i++)
493-        a[i] = i;
494-    assert(a.toString(), "0,1,2,3");
495-    a[0] = -1;
496-    assert(a[0], 255);
497-
498-    a = new Int8Array(3);
499-    a[0] = 255;
500-    assert(a[0], -1);
501-
502-    a = new Int32Array(3);
503-    a[0] = Math.pow(2, 32) - 1;
504-    assert(a[0], -1);
505-    assert(a.BYTES_PER_ELEMENT, 4);
506-
507-    a = new Uint8ClampedArray(4);
508-    a[0] = -100;
509-    a[1] = 1.5;
510-    a[2] = 0.5;
511-    a[3] = 1233.5;
512-    assert(a.toString(), "0,2,0,255");
513-    
514-    buffer = new ArrayBuffer(16);
515-    assert(buffer.byteLength, 16);
516-    a = new Uint32Array(buffer, 12, 1);
517-    assert(a.length, 1);
518-    a[0] = -1;
519-
520-    a = new Uint16Array(buffer, 2);
521-    a[0] = -1;
522-
523-    a = new Float32Array(buffer, 8, 1);
524-    a[0] = 1;
525-    
526-    a = new Uint8Array(buffer);
527-    
528-    assert(a.toString(), "0,0,255,255,0,0,0,0,0,0,128,63,255,255,255,255");
529-
530-    assert(a.buffer, buffer);
531-
532-    a = new Uint8Array([1, 2, 3, 4]);
533-    assert(a.toString(), "1,2,3,4");
534-    if (0) {
535-        a.set([10, 11], 2);
536-        assert(a.toString(), "1,2,10,11");
537-    }
538-
539-    a = new Uint8Array([1, 2, 3, 4]);
540-    a = a.subarray(1, 3);
541-    assert(a.toString(), "2,3");
542-}
543-
544-function repeat(a, n)
545-{
546-    var i, r;

✓ typeof Uint8Array = function
✓ new Uint8Array(4).length = 4
✓ typeof (new Uint8Array(4)).toString = undefined
✗ new Uint8Array(4).toString(): Error: undefined is not a function

/home/user/mquickjs-python/tests/test_compatibility.py

     1→"""
     2→Compatibility tests: run the same JavaScript against both C quickjs and Python implementation.
     3→
     4→These tests verify that mquickjs_python produces the same results as the reference C implementation.
     5→"""
     6→
     7→import pytest
     8→
     9→# Try to import both implementations
    10→try:
    11→    import quickjs as c_quickjs
    12→    C_AVAILABLE = True
    13→except ImportError:
    14→    C_AVAILABLE = False
    15→
    16→from mquickjs_python import JSContext
    17→
    18→
    19→def run_both(js_code):
    20→    """Run JavaScript code on both implementations and return (python_result, c_result)."""
    21→    # Run on Python implementation
    22→    py_ctx = JSContext()
    23→    py_result = py_ctx.eval(js_code)
    24→
    25→    # Run on C implementation
    26→    if C_AVAILABLE:
    27→        c_ctx = c_quickjs.Context()
    28→        c_result = c_ctx.eval(js_code)
    29→        return py_result, c_result
    30→    return py_result, None
    31→
    32→
    33→def normalize(val):
    34→    """Normalize values for comparison (handle type differences between implementations)."""
    35→    if val is None:
    36→        return None
    37→    if isinstance(val, bool):
    38→        return val
    39→    if isinstance(val, (int, float)):
    40→        return float(val) if isinstance(val, float) else val
    41→    if isinstance(val, str):
    42→        return val
    43→    # For arrays/objects, convert to comparable form
    44→    if hasattr(val, '__iter__') and not isinstance(val, str):
    45→        return list(val)
    46→    return val
    47→
    48→
    49→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
    50→class TestCompatibilityArithmetic:
    51→    """Test arithmetic produces same results."""
    52→
    53→    def test_addition(self):
    54→        py, c = run_both("1 + 2")
    55→        assert py == c == 3
    56→
    57→    def test_subtraction(self):
    58→        py, c = run_both("10 - 4")
    59→        assert py == c == 6
    60→
    61→    def test_multiplication(self):
    62→        py, c = run_both("6 * 7")
    63→        assert py == c == 42
    64→
    65→    def test_division(self):
    66→        py, c = run_both("15 / 3")
    67→        assert py == c == 5.0
    68→
    69→    def test_modulo(self):
    70→        py, c = run_both("17 % 5")
    71→        assert py == c == 2
    72→
    73→    def test_power(self):
    74→        py, c = run_both("2 ** 10")
    75→        assert py == c == 1024
    76→
    77→    def test_complex_expression(self):
    78→        py, c = run_both("(2 + 3) * 4 - 6 / 2")
    79→        assert py == c == 17.0
    80→
    81→
    82→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
    83→class TestCompatibilityStrings:
    84→    """Test string operations produce same results."""
    85→
    86→    def test_concatenation(self):
    87→        py, c = run_both("'hello' + ' ' + 'world'")
    88→        assert py == c == "hello world"
    89→
    90→    def test_length(self):
    91→        py, c = run_both("'hello'.length")
    92→        assert py == c == 5
    93→
    94→    def test_charAt(self):
    95→        py, c = run_both("'hello'.charAt(1)")
    96→        assert py == c == "e"
    97→
    98→    def test_substring(self):
    99→        py, c = run_both("'hello world'.substring(0, 5)")
   100→        assert py == c == "hello"
   101→
   102→    def test_indexOf(self):
   103→        py, c = run_both("'hello world'.indexOf('world')")
   104→        assert py == c == 6
   105→
   106→    def test_toUpperCase(self):
   107→        py, c = run_both("'hello'.toUpperCase()")
   108→        assert py == c == "HELLO"
   109→
   110→    def test_toLowerCase(self):
   111→        py, c = run_both("'HELLO'.toLowerCase()")
   112→        assert py == c == "hello"
   113→
   114→
   115→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
   116→class TestCompatibilityArrays:
   117→    """Test array operations produce same results."""
   118→
   119→    def test_array_literal(self):
   120→        py, c = run_both("[1, 2, 3].length")
   121→        assert py == c == 3
   122→
   123→    def test_array_access(self):
   124→        py, c = run_both("[10, 20, 30][1]")
   125→        assert py == c == 20
   126→
   127→    def test_array_push(self):
   128→        py, c = run_both("var a = [1, 2]; a.push(3); a.length")
   129→        assert py == c == 3
   130→
   131→    def test_array_join(self):
   132→        py, c = run_both("[1, 2, 3].join('-')")
   133→        assert py == c == "1-2-3"
   134→
   135→
   136→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
   137→class TestCompatibilityObjects:
   138→    """Test object operations produce same results."""
   139→
   140→    def test_object_property(self):
   141→        py, c = run_both("({x: 10}).x")
   142→        assert py == c == 10
   143→
   144→    def test_object_method(self):
   145→        py, c = run_both("({x: 10, getX: function() { return this.x; }}).getX()")
   146→        assert py == c == 10
   147→
   148→
   149→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
   150→class TestCompatibilityFunctions:
   151→    """Test function behavior produces same results."""
   152→
   153→    def test_function_call(self):
   154→        py, c = run_both("function add(a, b) { return a + b; } add(3, 4)")
   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:
   175→    """Test control flow produces same results."""
   176→
   177→    def test_if_else(self):
   178→        py, c = run_both("var x = 10; if (x > 5) { 'big'; } else { 'small'; }")
   179→        assert py == c == "big"
   180→
   181→    def test_ternary(self):
   182→        py, c = run_both("5 > 3 ? 'yes' : 'no'")
   183→        assert py == c == "yes"
   184→
   185→    def test_for_loop(self):
   186→        py, c = run_both("var sum = 0; for (var i = 1; i <= 5; i++) sum += i; sum")
   187→        assert py == c == 15
   188→
   189→    def test_while_loop(self):
   190→        py, c = run_both("var n = 5; var fact = 1; while (n > 1) { fact *= n; n--; } fact")
   191→        assert py == c == 120
   192→
   193→
   194→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
   195→class TestCompatibilityMath:
   196→    """Test Math functions produce same results."""
   197→
   198→    def test_math_abs(self):
   199→        py, c = run_both("Math.abs(-5)")
   200→        assert py == c == 5
   201→
   202→    def test_math_floor(self):
   203→        py, c = run_both("Math.floor(3.7)")
   204→        assert py == c == 3
   205→
   206→    def test_math_ceil(self):
   207→        py, c = run_both("Math.ceil(3.2)")
   208→        assert py == c == 4
   209→
   210→    def test_math_round(self):
   211→        py, c = run_both("Math.round(3.5)")
   212→        assert py == c == 4
   213→
   214→    def test_math_max(self):
   215→        py, c = run_both("Math.max(1, 5, 3)")
   216→        assert py == c == 5
   217→
   218→    def test_math_min(self):
   219→        py, c = run_both("Math.min(1, 5, 3)")
   220→        assert py == c == 1
   221→
   222→    def test_math_pow(self):
   223→        py, c = run_both("Math.pow(2, 8)")
   224→        assert py == c == 256
   225→
   226→    def test_math_sqrt(self):
   227→        py, c = run_both("Math.sqrt(16)")
   228→        assert py == c == 4
   229→
   230→
   231→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
   232→class TestCompatibilityTypeConversion:
   233→    """Test type coercion produces same results."""
   234→
   235→    def test_string_to_number(self):
   236→        py, c = run_both("Number('42')")
   237→        assert py == c == 42
   238→
   239→    def test_number_to_string(self):
   240→        py, c = run_both("String(42)")
   241→        assert py == c == "42"
   242→
   243→    def test_boolean_coercion(self):
   244→        py, c = run_both("Boolean(1)")
   245→        assert py == c == True
   246→
   247→    def test_string_number_addition(self):
   248→        py, c = run_both("'10' + 5")
   249→        assert py == c == "105"
   250→
   251→    def test_string_number_subtraction(self):
   252→        py, c = run_both("'10' - 5")
   253→        assert py == c == 5
   254→
   255→
   256→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
   257→class TestCompatibilityComparison:
   258→    """Test comparison operators produce same results."""
   259→
   260→    def test_equals(self):
   261→        py, c = run_both("5 == '5'")
   262→        assert py == c == True
   263→
   264→    def test_strict_equals(self):
   265→        py, c = run_both("5 === '5'")
   266→        assert py == c == False
   267→
   268→    def test_not_equals(self):
   269→        py, c = run_both("5 != 3")
   270→        assert py == c == True
   271→
   272→    def test_less_than(self):
   273→        py, c = run_both("3 < 5")
   274→        assert py == c == True
   275→
   276→    def test_greater_than(self):
   277→        py, c = run_both("5 > 3")
   278→        assert py == c == True
   279→
   280→
   281→# Summary of what would be needed to fix the xfail tests:
   282→#
   283→# 1. test_closure.js: Named function expressions need to make name available in scope
   284→#    - `var f = function myfunc() { return myfunc; }` should work
   285→#
   286→# 2. test_loop.js: Has an infinite loop issue (likely in for-in or labeled statements)
   287→#
   288→# 3. test_language.js: Syntax error - likely needs getter/setter or computed property support
   289→#
   290→# 4. test_rect.js: Requires C-defined Rectangle and FilledRectangle classes (not applicable)
   291→#
   292→# 5. test_builtin.js: Comprehensive built-in tests (many features needed)
   293→#
   294→# 6. mandelbrot.js/microbench.js: Performance tests (need complete VM)
   295→#
   296→# 7. Lookbehind regex: Need to implement positive/negative lookbehind in regex engine
   297→

<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>

No files found

Found 1 file
tests/test_compatibility.py

No matches found

tests/test_compatibility.py:281:# Summary of what would be needed to fix the xfail tests:
tests/test_js_basic.py:6:- Each .js file in tests/ (original mquickjs tests) is run with xfail (expected to fail)
tests/test_js_basic.py:79:@pytest.mark.xfail(reason="Original mquickjs tests - not yet passing")
tests/test_js_basic.py:84:    Watch for xfail tests that start passing!

     1→"""
     2→Parameterized pytest tests for JavaScript files.
     3→
     4→- Each .js file in tests/basic/ is run as a test case (should pass)
     5→- Each .js file in tests/compat/ are passing original mquickjs tests
     6→- Each .js file in tests/ (original mquickjs tests) is run with xfail (expected to fail)
     7→"""
     8→from pathlib import Path
     9→
    10→import pytest
    11→
    12→from mquickjs_python import JSContext
    13→
    14→
    15→def get_basic_test_files():
    16→    """Discover all .js files in tests/basic/ directory."""
    17→    basic_dir = Path(__file__).parent / "basic"
    18→    if not basic_dir.exists():
    19→        return []
    20→    js_files = sorted(basic_dir.glob("*.js"))
    21→    return [(f.name, f) for f in js_files]
    22→
    23→
    24→def get_compat_test_files():
    25→    """Discover passing original mquickjs .js test files in tests/compat/ directory."""
    26→    compat_dir = Path(__file__).parent / "compat"
    27→    if not compat_dir.exists():
    28→        return []
    29→    js_files = sorted(compat_dir.glob("*.js"))
    30→    return [(f.name, f) for f in js_files]
    31→
    32→
    33→def get_mquickjs_test_files():
    34→    """Discover original mquickjs .js test files in tests/ directory."""
    35→    tests_dir = Path(__file__).parent
    36→    # Get all .js files directly in tests/ (not in subdirectories)
    37→    js_files = sorted(tests_dir.glob("*.js"))
    38→    return [(f.name, f) for f in js_files]
    39→
    40→
    41→@pytest.mark.parametrize(
    42→    "name,path",
    43→    get_basic_test_files(),
    44→    ids=lambda x: x if isinstance(x, str) else None,
    45→)
    46→def test_basic_js(name: str, path: Path):
    47→    """Run a basic JavaScript test file."""
    48→    source = path.read_text(encoding="utf-8")
    49→    ctx = JSContext()
    50→    # Execute the script - if it throws, the test fails
    51→    ctx.eval(source)
    52→
    53→
    54→@pytest.mark.timeout(60)  # Allow up to 60 seconds for compat tests (e.g., mandelbrot.js)
    55→@pytest.mark.parametrize(
    56→    "name,path",
    57→    get_compat_test_files(),
    58→    ids=lambda x: x if isinstance(x, str) else None,
    59→)
    60→def test_compat_js(name: str, path: Path):
    61→    """Run a passing original mquickjs JavaScript test file.
    62→
    63→    These are tests from the original C mquickjs implementation
    64→    that now pass in our Python implementation.
    65→    """
    66→    source = path.read_text(encoding="utf-8")
    67→    # mandelbrot.js needs more time to render
    68→    time_limit = 30.0 if "mandelbrot" in name else 2.0
    69→    ctx = JSContext(time_limit=time_limit)
    70→    # Execute the script - if it throws, the test fails
    71→    ctx.eval(source)
    72→
    73→
    74→@pytest.mark.parametrize(
    75→    "name,path",
    76→    get_mquickjs_test_files(),
    77→    ids=lambda x: x if isinstance(x, str) else None,
    78→)
    79→@pytest.mark.xfail(reason="Original mquickjs tests - not yet passing")
    80→def test_mquickjs_js(name: str, path: Path):
    81→    """Run an original mquickjs JavaScript test file.
    82→
    83→    These tests are expected to fail until the VM is complete.
    84→    Watch for xfail tests that start passing!
    85→    """
    86→    source = path.read_text(encoding="utf-8")
    87→    ctx = JSContext(time_limit=2.0)  # Timeout to avoid infinite loops
    88→    # Execute the script - if it throws, the test fails
    89→    ctx.eval(source)
    90→

<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 created successfully at: /home/user/mquickjs-python/tests/test_builtin_funcs.py

============================= 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: /home/user/mquickjs-python
configfile: pyproject.toml
collecting ... collected 15 items

tests/test_builtin_funcs.py::test_builtin_function[test_function] PASSED [  6%]
tests/test_builtin_funcs.py::test_builtin_function[test] PASSED          [ 13%]
tests/test_builtin_funcs.py::test_builtin_function[test_enum] PASSED     [ 20%]
tests/test_builtin_funcs.py::test_builtin_function[test_array] PASSED    [ 26%]
tests/test_builtin_funcs.py::test_builtin_function[test_array_ext] PASSED [ 33%]
tests/test_builtin_funcs.py::test_builtin_function[test_string] PASSED   [ 40%]
tests/test_builtin_funcs.py::test_builtin_function[test_string2] PASSED  [ 46%]
tests/test_builtin_funcs.py::test_builtin_function[test_math] PASSED     [ 53%]
tests/test_builtin_funcs.py::test_builtin_function[test_number] PASSED   [ 60%]
tests/test_builtin_funcs.py::test_builtin_function[test_global_eval] XFAIL [ 66%]
tests/test_builtin_funcs.py::test_builtin_function[test_typed_array] XFAIL [ 73%]
tests/test_builtin_funcs.py::test_builtin_function[test_json] PASSED     [ 80%]
tests/test_builtin_funcs.py::test_builtin_function[test_large_eval_parse_stack] XFAIL [ 86%]
tests/test_builtin_funcs.py::test_builtin_function[test_regexp] XFAIL    [ 93%]
tests/test_builtin_funcs.py::test_builtin_function[test_line_column_numbers] XFAIL [100%]

======================== 10 passed, 5 xfailed in 0.84s =========================

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

On branch claude/python-mquickjs-port-uPKcc
Your branch is up to date with 'origin/claude/python-mquickjs-port-uPKcc'.

Changes to be committed:
  (use "git restore --staged <file>..." to unstage)
	modified:   src/mquickjs_python/context.py
	modified:   src/mquickjs_python/vm.py
	new file:   tests/test_builtin_funcs.py

 src/mquickjs_python/context.py |  11 +++--
 src/mquickjs_python/vm.py      |  73 +++++++++++++++++++++++++----
 tests/test_builtin_funcs.py    | 102 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 172 insertions(+), 14 deletions(-)

3 files changed, 172 insertions(+), 14 deletions(-)
 create mode 100644 tests/test_builtin_funcs.py

     1→"""
     2→Compatibility tests: run the same JavaScript against both C quickjs and Python implementation.
     3→
     4→These tests verify that mquickjs_python produces the same results as the reference C implementation.
     5→"""
     6→
     7→import pytest
     8→
     9→# Try to import both implementations
    10→try:
    11→    import quickjs as c_quickjs
    12→    C_AVAILABLE = True
    13→except ImportError:
    14→    C_AVAILABLE = False
    15→
    16→from mquickjs_python import JSContext
    17→
    18→
    19→def run_both(js_code):
    20→    """Run JavaScript code on both implementations and return (python_result, c_result)."""
    21→    # Run on Python implementation
    22→    py_ctx = JSContext()
    23→    py_result = py_ctx.eval(js_code)
    24→
    25→    # Run on C implementation
    26→    if C_AVAILABLE:
    27→        c_ctx = c_quickjs.Context()
    28→        c_result = c_ctx.eval(js_code)
    29→        return py_result, c_result
    30→    return py_result, None
    31→
    32→
    33→def normalize(val):
    34→    """Normalize values for comparison (handle type differences between implementations)."""
    35→    if val is None:
    36→        return None
    37→    if isinstance(val, bool):
    38→        return val
    39→    if isinstance(val, (int, float)):
    40→        return float(val) if isinstance(val, float) else val
    41→    if isinstance(val, str):
    42→        return val
    43→    # For arrays/objects, convert to comparable form
    44→    if hasattr(val, '__iter__') and not isinstance(val, str):
    45→        return list(val)
    46→    return val
    47→
    48→
    49→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
    50→class TestCompatibilityArithmetic:
    51→    """Test arithmetic produces same results."""
    52→
    53→    def test_addition(self):
    54→        py, c = run_both("1 + 2")
    55→        assert py == c == 3
    56→
    57→    def test_subtraction(self):
    58→        py, c = run_both("10 - 4")
    59→        assert py == c == 6
    60→
    61→    def test_multiplication(self):
    62→        py, c = run_both("6 * 7")
    63→        assert py == c == 42
    64→
    65→    def test_division(self):
    66→        py, c = run_both("15 / 3")
    67→        assert py == c == 5.0
    68→
    69→    def test_modulo(self):
    70→        py, c = run_both("17 % 5")
    71→        assert py == c == 2
    72→
    73→    def test_power(self):
    74→        py, c = run_both("2 ** 10")
    75→        assert py == c == 1024
    76→
    77→    def test_complex_expression(self):
    78→        py, c = run_both("(2 + 3) * 4 - 6 / 2")
    79→        assert py == c == 17.0
    80→
    81→
    82→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
    83→class TestCompatibilityStrings:
    84→    """Test string operations produce same results."""
    85→
    86→    def test_concatenation(self):
    87→        py, c = run_both("'hello' + ' ' + 'world'")
    88→        assert py == c == "hello world"
    89→
    90→    def test_length(self):
    91→        py, c = run_both("'hello'.length")
    92→        assert py == c == 5
    93→
    94→    def test_charAt(self):
    95→        py, c = run_both("'hello'.charAt(1)")
    96→        assert py == c == "e"
    97→
    98→    def test_substring(self):
    99→        py, c = run_both("'hello world'.substring(0, 5)")
   100→        assert py == c == "hello"
   101→
   102→    def test_indexOf(self):
   103→        py, c = run_both("'hello world'.indexOf('world')")
   104→        assert py == c == 6
   105→
   106→    def test_toUpperCase(self):
   107→        py, c = run_both("'hello'.toUpperCase()")
   108→        assert py == c == "HELLO"
   109→
   110→    def test_toLowerCase(self):
   111→        py, c = run_both("'HELLO'.toLowerCase()")
   112→        assert py == c == "hello"
   113→
   114→
   115→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
   116→class TestCompatibilityArrays:
   117→    """Test array operations produce same results."""
   118→
   119→    def test_array_literal(self):
   120→        py, c = run_both("[1, 2, 3].length")
   121→        assert py == c == 3
   122→
   123→    def test_array_access(self):
   124→        py, c = run_both("[10, 20, 30][1]")
   125→        assert py == c == 20
   126→
   127→    def test_array_push(self):
   128→        py, c = run_both("var a = [1, 2]; a.push(3); a.length")
   129→        assert py == c == 3
   130→
   131→    def test_array_join(self):
   132→        py, c = run_both("[1, 2, 3].join('-')")
   133→        assert py == c == "1-2-3"
   134→
   135→
   136→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
   137→class TestCompatibilityObjects:
   138→    """Test object operations produce same results."""
   139→
   140→    def test_object_property(self):
   141→        py, c = run_both("({x: 10}).x")
   142→        assert py == c == 10
   143→
   144→    def test_object_method(self):
   145→        py, c = run_both("({x: 10, getX: function() { return this.x; }}).getX()")
   146→        assert py == c == 10
   147→
   148→
   149→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
   150→class TestCompatibilityFunctions:
   151→    """Test function behavior produces same results."""
   152→
   153→    def test_function_call(self):
   154→        py, c = run_both("function add(a, b) { return a + b; } add(3, 4)")
   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:
   175→    """Test control flow produces same results."""
   176→
   177→    def test_if_else(self):
   178→        py, c = run_both("var x = 10; if (x > 5) { 'big'; } else { 'small'; }")
   179→        assert py == c == "big"
   180→
   181→    def test_ternary(self):
   182→        py, c = run_both("5 > 3 ? 'yes' : 'no'")
   183→        assert py == c == "yes"
   184→
   185→    def test_for_loop(self):
   186→        py, c = run_both("var sum = 0; for (var i = 1; i <= 5; i++) sum += i; sum")
   187→        assert py == c == 15
   188→
   189→    def test_while_loop(self):
   190→        py, c = run_both("var n = 5; var fact = 1; while (n > 1) { fact *= n; n--; } fact")
   191→        assert py == c == 120
   192→
   193→
   194→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
   195→class TestCompatibilityMath:
   196→    """Test Math functions produce same results."""
   197→
   198→    def test_math_abs(self):
   199→        py, c = run_both("Math.abs(-5)")
   200→        assert py == c == 5
   201→
   202→    def test_math_floor(self):
   203→        py, c = run_both("Math.floor(3.7)")
   204→        assert py == c == 3
   205→
   206→    def test_math_ceil(self):
   207→        py, c = run_both("Math.ceil(3.2)")
   208→        assert py == c == 4
   209→
   210→    def test_math_round(self):
   211→        py, c = run_both("Math.round(3.5)")
   212→        assert py == c == 4
   213→
   214→    def test_math_max(self):
   215→        py, c = run_both("Math.max(1, 5, 3)")
   216→        assert py == c == 5
   217→
   218→    def test_math_min(self):
   219→        py, c = run_both("Math.min(1, 5, 3)")
   220→        assert py == c == 1
   221→
   222→    def test_math_pow(self):
   223→        py, c = run_both("Math.pow(2, 8)")
   224→        assert py == c == 256
   225→
   226→    def test_math_sqrt(self):
   227→        py, c = run_both("Math.sqrt(16)")
   228→        assert py == c == 4
   229→
   230→
   231→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
   232→class TestCompatibilityTypeConversion:
   233→    """Test type coercion produces same results."""
   234→
   235→    def test_string_to_number(self):
   236→        py, c = run_both("Number('42')")
   237→        assert py == c == 42
   238→
   239→    def test_number_to_string(self):
   240→        py, c = run_both("String(42)")
   241→        assert py == c == "42"
   242→
   243→    def test_boolean_coercion(self):
   244→        py, c = run_both("Boolean(1)")
   245→        assert py == c == True
   246→
   247→    def test_string_number_addition(self):
   248→        py, c = run_both("'10' + 5")
   249→        assert py == c == "105"
   250→
   251→    def test_string_number_subtraction(self):
   252→        py, c = run_both("'10' - 5")
   253→        assert py == c == 5
   254→
   255→
   256→@pytest.mark.skipif(not C_AVAILABLE, reason="C quickjs library not installed")
   257→class TestCompatibilityComparison:
   258→    """Test comparison operators produce same results."""
   259→
   260→    def test_equals(self):
   261→        py, c = run_both("5 == '5'")
   262→        assert py == c == True
   263→
   264→    def test_strict_equals(self):
   265→        py, c = run_both("5 === '5'")
   266→        assert py == c == False
   267→
   268→    def test_not_equals(self):
   269→        py, c = run_both("5 != 3")
   270→        assert py == c == True
   271→
   272→    def test_less_than(self):
   273→        py, c = run_both("3 < 5")
   274→        assert py == c == True
   275→
   276→    def test_greater_than(self):
   277→        py, c = run_both("5 > 3")
   278→        assert py == c == True
   279→
   280→
   281→# Summary of what would be needed to fix the xfail tests:
   282→#
   283→# 1. test_closure.js: Named function expressions need to make name available in scope
   284→#    - `var f = function myfunc() { return myfunc; }` should work
   285→#
   286→# 2. test_loop.js: Has an infinite loop issue (likely in for-in or labeled statements)
   287→#
   288→# 3. test_language.js: Syntax error - likely needs getter/setter or computed property support
   289→#
   290→# 4. test_rect.js: Requires C-defined Rectangle and FilledRectangle classes (not applicable)
   291→#
   292→# 5. test_builtin.js: Comprehensive built-in tests (many features needed)
   293→#
   294→# 6. mandelbrot.js/microbench.js: Performance tests (need complete VM)
   295→#
   296→# 7. Lookbehind regex: Need to implement positive/negative lookbehind in regex engine
   297→

<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 file /home/user/mquickjs-python/tests/test_compatibility.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     1→"""
     2→JavaScript feature tests for mquickjs_python.
     3→
     4→These tests verify that mquickjs_python correctly implements JavaScript behavior.
     5→"""
     6→
     7→import pytest
     8→
     9→from mquickjs_python import JSContext
    10→
    11→
    12→def run_js(js_code):
    13→    """Run JavaScript code and return the result."""
    14→    ctx = JSContext()
    15→    return ctx.eval(js_code)
    16→
    17→
    18→class TestArithmetic:
    19→    """Test arithmetic operations."""
    20→
    21→    def test_addition(self):
    22→        assert run_js("1 + 2") == 3
    23→
    24→    def test_subtraction(self):
    25→        assert run_js("10 - 4") == 6
    26→
    27→    def test_multiplication(self):
    28→        assert run_js("6 * 7") == 42
    29→
    30→    def test_division(self):
    31→        assert run_js("15 / 3") == 5.0
    32→
    33→    def test_modulo(self):
    34→        assert run_js("17 % 5") == 2
    35→
    36→    def test_power(self):
    37→        assert run_js("2 ** 10") == 1024
    38→
    39→    def test_complex_expression(self):
    40→        assert run_js("(2 + 3) * 4 - 6 / 2") == 17.0
    41→
    42→
    43→class TestStrings:
    44→    """Test string operations."""
    45→
    46→    def test_concatenation(self):
    47→        assert run_js("'hello' + ' ' + 'world'") == "hello world"
    48→
    49→    def test_length(self):
    50→        assert run_js("'hello'.length") == 5
    51→
    52→    def test_charAt(self):
    53→        assert run_js("'hello'.charAt(1)") == "e"
    54→
    55→    def test_substring(self):
    56→        assert run_js("'hello world'.substring(0, 5)") == "hello"
    57→
    58→    def test_indexOf(self):
    59→        assert run_js("'hello world'.indexOf('world')") == 6
    60→
    61→    def test_toUpperCase(self):
    62→        assert run_js("'hello'.toUpperCase()") == "HELLO"
    63→
    64→    def test_toLowerCase(self):
    65→        assert run_js("'HELLO'.toLowerCase()") == "hello"
    66→
    67→
    68→class TestArrays:
    69→    """Test array operations."""
    70→
    71→    def test_array_literal(self):
    72→        assert run_js("[1, 2, 3].length") == 3
    73→
    74→    def test_array_access(self):
    75→        assert run_js("[10, 20, 30][1]") == 20
    76→
    77→    def test_array_push(self):
    78→        assert run_js("var a = [1, 2]; a.push(3); a.length") == 3
    79→
    80→    def test_array_join(self):
    81→        assert run_js("[1, 2, 3].join('-')") == "1-2-3"
    82→
    83→
    84→class TestObjects:
    85→    """Test object operations."""
    86→
    87→    def test_object_property(self):
    88→        assert run_js("({x: 10}).x") == 10
    89→
    90→    def test_object_method(self):
    91→        assert run_js("({x: 10, getX: function() { return this.x; }}).getX()") == 10
    92→
    93→
    94→class TestFunctions:
    95→    """Test function behavior."""
    96→
    97→    def test_function_call(self):
    98→        assert run_js("function add(a, b) { return a + b; } add(3, 4)") == 7
    99→
   100→    def test_closure(self):
   101→        result = run_js("""
   102→            function makeCounter() {
   103→                var count = 0;
   104→                return function() { return ++count; };
   105→            }
   106→            var counter = makeCounter();
   107→            counter(); counter(); counter()
   108→        """)
   109→        assert result == 3
   110→
   111→    def test_arrow_function(self):
   112→        assert run_js("((x) => x * 2)(5)") == 10
   113→
   114→
   115→class TestControlFlow:
   116→    """Test control flow."""
   117→
   118→    def test_if_else(self):
   119→        assert run_js("var x = 10; if (x > 5) { 'big'; } else { 'small'; }") == "big"
   120→
   121→    def test_ternary(self):
   122→        assert run_js("5 > 3 ? 'yes' : 'no'") == "yes"
   123→
   124→    def test_for_loop(self):
   125→        assert run_js("var sum = 0; for (var i = 1; i <= 5; i++) sum += i; sum") == 15
   126→
   127→    def test_while_loop(self):
   128→        assert run_js("var n = 5; var fact = 1; while (n > 1) { fact *= n; n--; } fact") == 120
   129→
   130→
   131→class TestMath:
   132→    """Test Math functions."""
   133→
   134→    def test_math_abs(self):
   135→        assert run_js("Math.abs(-5)") == 5
   136→
   137→    def test_math_floor(self):
   138→        assert run_js("Math.floor(3.7)") == 3
   139→
   140→    def test_math_ceil(self):
   141→        assert run_js("Math.ceil(3.2)") == 4
   142→
   143→    def test_math_round(self):
   144→        assert run_js("Math.round(3.5)") == 4
   145→
   146→    def test_math_max(self):
   147→        assert run_js("Math.max(1, 5, 3)") == 5
   148→
   149→    def test_math_min(self):
   150→        assert run_js("Math.min(1, 5, 3)") == 1
   151→
   152→    def test_math_pow(self):
   153→        assert run_js("Math.pow(2, 8)") == 256
   154→
   155→    def test_math_sqrt(self):
   156→        assert run_js("Math.sqrt(16)") == 4
   157→
   158→
   159→class TestTypeConversion:
   160→    """Test type coercion."""
   161→
   162→    def test_string_to_number(self):
   163→        assert run_js("Number('42')") == 42
   164→
   165→    def test_number_to_string(self):
   166→        assert run_js("String(42)") == "42"
   167→
   168→    def test_boolean_coercion(self):
   169→        assert run_js("Boolean(1)") == True
   170→
   171→    def test_string_number_addition(self):
   172→        assert run_js("'10' + 5") == "105"
   173→
   174→    def test_string_number_subtraction(self):
   175→        assert run_js("'10' - 5") == 5
   176→
   177→
   178→class TestComparison:
   179→    """Test comparison operators."""
   180→
   181→    def test_equals(self):
   182→        assert run_js("5 == '5'") == True
   183→
   184→    def test_strict_equals(self):
   185→        assert run_js("5 === '5'") == False
   186→
   187→    def test_not_equals(self):
   188→        assert run_js("5 != 3") == True
   189→
   190→    def test_less_than(self):
   191→        assert run_js("3 < 5") == True
   192→
   193→    def test_greater_than(self):
   194→        assert run_js("5 > 3") == True
   195→

tests/test_compatibility.py::TestMath::test_math_abs PASSED              [ 62%]
tests/test_compatibility.py::TestMath::test_math_floor PASSED            [ 64%]
tests/test_compatibility.py::TestMath::test_math_ceil PASSED             [ 66%]
tests/test_compatibility.py::TestMath::test_math_round PASSED            [ 68%]
tests/test_compatibility.py::TestMath::test_math_max PASSED              [ 71%]
tests/test_compatibility.py::TestMath::test_math_min PASSED              [ 73%]
tests/test_compatibility.py::TestMath::test_math_pow PASSED              [ 75%]
tests/test_compatibility.py::TestMath::test_math_sqrt PASSED             [ 77%]
tests/test_compatibility.py::TestTypeConversion::test_string_to_number PASSED [ 80%]
tests/test_compatibility.py::TestTypeConversion::test_number_to_string PASSED [ 82%]
tests/test_compatibility.py::TestTypeConversion::test_boolean_coercion PASSED [ 84%]
tests/test_compatibility.py::TestTypeConversion::test_string_number_addition PASSED [ 86%]
tests/test_compatibility.py::TestTypeConversion::test_string_number_subtraction PASSED [ 88%]
tests/test_compatibility.py::TestComparison::test_equals PASSED          [ 91%]
tests/test_compatibility.py::TestComparison::test_strict_equals PASSED   [ 93%]
tests/test_compatibility.py::TestComparison::test_not_equals PASSED      [ 95%]
tests/test_compatibility.py::TestComparison::test_less_than PASSED       [ 97%]
tests/test_compatibility.py::TestComparison::test_greater_than PASSED    [100%]

============================== 45 passed in 0.16s ==============================

1 file changed, 72 insertions(+), 174 deletions(-)

branch 'claude/python-mquickjs-port-uPKcc' set up to track 'origin/claude/python-mquickjs-port-uPKcc'.
To http://127.0.0.1:49259/git/simonw/mquickjs-python
   4af743b..4b5c19c  claude/python-mquickjs-port-uPKcc -> 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

/home/user/mquickjs-python/src/mquickjs_python/values.py-382-        # Add match result properties
/home/user/mquickjs-python/src/mquickjs_python/values.py-383-        arr.set("index", result.index)
/home/user/mquickjs-python/src/mquickjs_python/values.py-384-        arr.set("input", result.input)
/home/user/mquickjs-python/src/mquickjs_python/values.py-385-
/home/user/mquickjs-python/src/mquickjs_python/values.py-386-        return arr
/home/user/mquickjs-python/src/mquickjs_python/values.py-387-
src/mquickjs_python/values.py-388-    def __repr__(self) -> str:
/home/user/mquickjs-python/src/mquickjs_python/values.py-389-        return f"/{self._pattern}/{self._flags}"
/home/user/mquickjs-python/src/mquickjs_python/values.py-390-
/home/user/mquickjs-python/src/mquickjs_python/values.py-391-
src/mquickjs_python/values.py-392-class JSBoundMethod:
/home/user/mquickjs-python/src/mquickjs_python/values.py-393-    """A method that expects 'this' as the first argument when called."""
/home/user/mquickjs-python/src/mquickjs_python/values.py-394-
src/mquickjs_python/values.py-395-    def __init__(self, fn):
/home/user/mquickjs-python/src/mquickjs_python/values.py-396-        self._fn = fn
/home/user/mquickjs-python/src/mquickjs_python/values.py-397-
src/mquickjs_python/values.py-398-    def __call__(self, this_val, *args):
/home/user/mquickjs-python/src/mquickjs_python/values.py-399-        return self._fn(this_val, *args)
/home/user/mquickjs-python/src/mquickjs_python/values.py-400-
/home/user/mquickjs-python/src/mquickjs_python/values.py-401-
src/mquickjs_python/values.py:402:class JSTypedArray(JSObject):
/home/user/mquickjs-python/src/mquickjs_python/values.py-403-    """Base class for JavaScript typed arrays."""
/home/user/mquickjs-python/src/mquickjs_python/values.py-404-
/home/user/mquickjs-python/src/mquickjs_python/values.py-405-    # Subclasses override these
/home/user/mquickjs-python/src/mquickjs_python/values.py-406-    _element_size = 1  # bytes per element
/home/user/mquickjs-python/src/mquickjs_python/values.py-407-    _type_name = "TypedArray"
/home/user/mquickjs-python/src/mquickjs_python/values.py-408-
src/mquickjs_python/values.py-409-    def __init__(self, length: int = 0):
/home/user/mquickjs-python/src/mquickjs_python/values.py-410-        super().__init__()
/home/user/mquickjs-python/src/mquickjs_python/values.py-411-        self._data = [0] * length
/home/user/mquickjs-python/src/mquickjs_python/values.py-412-
/home/user/mquickjs-python/src/mquickjs_python/values.py-413-    @property
src/mquickjs_python/values.py-414-    def length(self) -> int:
/home/user/mquickjs-python/src/mquickjs_python/values.py-415-        return len(self._data)
/home/user/mquickjs-python/src/mquickjs_python/values.py-416-
src/mquickjs_python/values.py-417-    def get_index(self, index: int):
src/mquickjs_python/values.py-418-        if 0 <= index < len(self._data):
/home/user/mquickjs-python/src/mquickjs_python/values.py-419-            return self._data[index]
/home/user/mquickjs-python/src/mquickjs_python/values.py-420-        return UNDEFINED
/home/user/mquickjs-python/src/mquickjs_python/values.py-421-
src/mquickjs_python/values.py-422-    def set_index(self, index: int, value) -> None:

   402→class JSTypedArray(JSObject):
   403→    """Base class for JavaScript typed arrays."""
   404→
   405→    # Subclasses override these
   406→    _element_size = 1  # bytes per element
   407→    _type_name = "TypedArray"
   408→
   409→    def __init__(self, length: int = 0):
   410→        super().__init__()
   411→        self._data = [0] * length
   412→
   413→    @property
   414→    def length(self) -> int:
   415→        return len(self._data)
   416→
   417→    def get_index(self, index: int):
   418→        if 0 <= index < len(self._data):
   419→            return self._data[index]
   420→        return UNDEFINED
   421→
   422→    def set_index(self, index: int, value) -> None:
   423→        if 0 <= index < len(self._data):
   424→            self._data[index] = self._coerce_value(value)
   425→
   426→    def _coerce_value(self, value):
   427→        """Coerce value to the appropriate type. Override in subclasses."""
   428→        return int(value) if isinstance(value, (int, float)) else 0
   429→
   430→    def __repr__(self) -> str:
   431→        return f"{self._type_name}({self._data})"
   432→
   433→
   434→class JSInt32Array(JSTypedArray):
   435→    """JavaScript Int32Array."""
   436→
   437→    _element_size = 4
   438→    _type_name = "Int32Array"
   439→
   440→    def _coerce_value(self, value):
   441→        """Coerce to signed 32-bit integer."""
   442→        if isinstance(value, (int, float)):
   443→            v = int(value)
   444→            # Handle overflow to signed 32-bit
   445→            v = v & 0xFFFFFFFF
   446→            if v >= 0x80000000:
   447→                v -= 0x100000000
   448→            return v
   449→        return 0
   450→
   451→
   452→class JSUint32Array(JSTypedArray):
   453→    """JavaScript Uint32Array."""
   454→
   455→    _element_size = 4
   456→    _type_name = "Uint32Array"
   457→
   458→    def _coerce_value(self, value):
   459→        """Coerce to unsigned 32-bit integer."""
   460→        if isinstance(value, (int, float)):
   461→            return int(value) & 0xFFFFFFFF
   462→        return 0
   463→
   464→
   465→class JSFloat64Array(JSTypedArray):
   466→    """JavaScript Float64Array."""
   467→
   468→    _element_size = 8
   469→    _type_name = "Float64Array"
   470→
   471→    def _coerce_value(self, value):
   472→        """Coerce to float."""
   473→        if isinstance(value, (int, float)):
   474→            return float(value)
   475→        return 0.0
   476→
   477→
   478→class JSUint8Array(JSTypedArray):
   479→    """JavaScript Uint8Array."""
   480→
   481→    _element_size = 1
   482→    _type_name = "Uint8Array"
   483→
   484→    def _coerce_value(self, value):
   485→        """Coerce to unsigned 8-bit integer."""
   486→        if isinstance(value, (int, float)):
   487→            return int(value) & 0xFF
   488→        return 0
   489→
   490→
   491→class JSInt8Array(JSTypedArray):
   492→    """JavaScript Int8Array."""
   493→
   494→    _element_size = 1
   495→    _type_name = "Int8Array"
   496→
   497→    def _coerce_value(self, value):
   498→        """Coerce to signed 8-bit integer."""
   499→        if isinstance(value, (int, float)):
   500→            v = int(value) & 0xFF
   501→            if v >= 0x80:

<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>

7-
8-from .opcodes import OpCode
9-from .compiler import CompiledFunction
10-from .values import (
11-    UNDEFINED, NULL, JSUndefined, JSNull, JSValue,
12:    JSObject, JSArray, JSFunction, JSRegExp, JSTypedArray,
13-    to_boolean, to_number, to_string, js_typeof,
14-)
15-from .errors import (
16-    JSError, JSTypeError, JSReferenceError,
17-    MemoryLimitError, TimeLimitError,
--
888-        if obj is UNDEFINED or obj is NULL:
889-            raise JSTypeError(f"Cannot read property of {obj}")
890-
891-        key_str = to_string(key) if not isinstance(key, str) else key
892-
893:        if isinstance(obj, JSTypedArray):
894-            # Typed array index access
895-            try:
896-                idx = int(key_str)
897-                if idx >= 0:
898-                    return obj.get_index(idx)
--
1885-        if obj is UNDEFINED or obj is NULL:
1886-            raise JSTypeError(f"Cannot set property of {obj}")
1887-
1888-        key_str = to_string(key) if not isinstance(key, str) else key
1889-
1890:        if isinstance(obj, JSTypedArray):
1891-            try:
1892-                idx = int(key_str)
1893-                if idx >= 0:
1894-                    obj.set_index(idx, value)
1895-                    return

   888→        if obj is UNDEFINED or obj is NULL:
   889→            raise JSTypeError(f"Cannot read property of {obj}")
   890→
   891→        key_str = to_string(key) if not isinstance(key, str) else key
   892→
   893→        if isinstance(obj, JSTypedArray):
   894→            # Typed array index access
   895→            try:
   896→                idx = int(key_str)
   897→                if idx >= 0:
   898→                    return obj.get_index(idx)
   899→            except ValueError:
   900→                pass
   901→            if key_str == "length":
   902→                return obj.length
   903→            return obj.get(key_str)
   904→
   905→        if isinstance(obj, JSArray):
   906→            # Array index access
   907→            try:
   908→                idx = int(key_str)
   909→                if idx >= 0:
   910→                    return obj.get_index(idx)
   911→            except ValueError:
   912→                pass
   913→            if key_str == "length":
   914→                return obj.length
   915→            # Built-in array methods
   916→            array_methods = [
   917→                "push", "pop", "shift", "unshift", "toString", "join",
   918→                "map", "filter", "reduce", "reduceRight", "forEach", "indexOf", "lastIndexOf",
   919→                "find", "findIndex", "some", "every", "concat", "slice", "splice",
   920→                "reverse", "includes", "sort",
   921→            ]
   922→            if key_str in array_methods:
   923→                return self._make_array_method(obj, key_str)
   924→            return obj.get(key_str)
   925→
   926→        if isinstance(obj, JSRegExp):
   927→            # RegExp methods and properties

<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 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:
   889→            raise JSTypeError(f"Cannot read property of {obj}")
   890→
   891→        key_str = to_string(key) if not isinstance(key, str) else key
   892→
   893→        if isinstance(obj, JSTypedArray):
   894→            # Typed array index access
   895→            try:
   896→                idx = int(key_str)
   897→                if idx >= 0:
   898→                    return obj.get_index(idx)
   899→            except ValueError:
   900→                pass
   901→            if key_str == "length":
   902→                return obj.length
   903→            if key_str == "BYTES_PER_ELEMENT":
   904→                return obj._element_size
   905→            if key_str == "buffer":
   906→                # Return the underlying buffer if it exists
   907→                return getattr(obj, '_buffer', UNDEFINED)
   908→            # Built-in typed array methods
   909→            typed_array_methods = ["toString", "join", "subarray", "set"]
   910→            if key_str in typed_array_methods:
   911→                return self._make_typed_array_method(obj, key_str)
   912→            return obj.get(key_str)
   913→
   914→        if isinstance(obj, JSArray):
   915→            # Array index access
   916→            try:

1011:    def _make_array_method(self, arr: JSArray, method: str) -> Any:

  1440→        def test_fn(*args):
  1441→            string = to_string(args[0]) if args else ""
  1442→            return re.test(string)
  1443→
  1444→        def exec_fn(*args):
  1445→            string = to_string(args[0]) if args else ""
  1446→            return re.exec(string)
  1447→
  1448→        methods = {
  1449→            "test": test_fn,
  1450→            "exec": exec_fn,
  1451→        }
  1452→        return methods.get(method, lambda *args: UNDEFINED)
  1453→
  1454→    def _make_number_method(self, n: float, method: str) -> Any:
  1455→        """Create a bound number method."""
  1456→        def toFixed(*args):
  1457→            digits = int(to_number(args[0])) if args else 0
  1458→            if digits < 0 or digits > 100:
  1459→                raise JSReferenceError("toFixed() digits out of range")
  1460→            # Use JavaScript-style rounding (round half away from zero)
  1461→            rounded = js_round(n, digits)
  1462→            result = f"{rounded:.{digits}f}"
  1463→            # Handle negative zero: if n was negative but rounded to 0, keep the sign
  1464→            if n < 0 or (n == 0 and math.copysign(1, n) == -1):
  1465→                if rounded == 0:
  1466→                    result = "-" + result.lstrip("-")
  1467→            return result
  1468→
  1469→        def toString(*args):

<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>

  1449→            "test": test_fn,
  1450→            "exec": exec_fn,
  1451→        }
  1452→        return methods.get(method, lambda *args: UNDEFINED)
  1453→
  1454→    def _make_number_method(self, n: float, method: str) -> Any:
  1455→        """Create a bound number method."""
  1456→        def toFixed(*args):
  1457→            digits = int(to_number(args[0])) if args else 0
  1458→            if digits < 0 or digits > 100:

<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 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:
  1444→        def exec_fn(*args):
  1445→            string = to_string(args[0]) if args else ""
  1446→            return re.exec(string)
  1447→
  1448→        methods = {
  1449→            "test": test_fn,
  1450→            "exec": exec_fn,
  1451→        }
  1452→        return methods.get(method, lambda *args: UNDEFINED)
  1453→
  1454→    def _make_typed_array_method(self, arr: JSTypedArray, method: str) -> Any:
  1455→        """Create a bound typed array method."""
  1456→        def toString_fn(*args):
  1457→            # Join elements with comma
  1458→            return ",".join(str(arr.get_index(i)) for i in range(arr.length))
  1459→
  1460→        def join_fn(*args):
  1461→            separator = to_string(args[0]) if args else ","
  1462→            return separator.join(str(arr.get_index(i)) for i in range(arr.length))
  1463→
  1464→        def subarray_fn(*args):
  1465→            begin = int(to_number(args[0])) if len(args) > 0 else 0
  1466→            end = int(to_number(args[1])) if len(args) > 1 else arr.length
  1467→
  1468→            # Handle negative indices
  1469→            if begin < 0:
  1470→                begin = max(0, arr.length + begin)
  1471→            if end < 0:
  1472→                end = max(0, arr.length + end)
  1473→
  1474→            # Clamp to bounds
  1475→            begin = min(begin, arr.length)
  1476→            end = min(end, arr.length)
  1477→
  1478→            # Create new typed array of same type
  1479→            result = type(arr)(max(0, end - begin))
  1480→            for i in range(begin, end):
  1481→                result.set_index(i - begin, arr.get_index(i))
  1482→            # Share the same buffer if the original has one
  1483→            if hasattr(arr, '_buffer'):
  1484→                result._buffer = arr._buffer
  1485→            return result
  1486→
  1487→        def set_fn(*args):
  1488→            # TypedArray.set(array, offset)
  1489→            source = args[0] if args else UNDEFINED
  1490→            offset = int(to_number(args[1])) if len(args) > 1 else 0
  1491→
  1492→            if isinstance(source, (JSArray, JSTypedArray)):
  1493→                for i in range(source.length):
  1494→                    arr.set_index(offset + i, source.get_index(i))
  1495→            return UNDEFINED
  1496→
  1497→        methods = {
  1498→            "toString": toString_fn,
  1499→            "join": join_fn,
  1500→            "subarray": subarray_fn,
  1501→            "set": set_fn,
  1502→        }
  1503→        return methods.get(method, lambda *args: UNDEFINED)
  1504→
  1505→    def _make_number_method(self, n: float, method: str) -> Any:
  1506→        """Create a bound number method."""
  1507→        def toFixed(*args):
  1508→            digits = int(to_number(args[0])) if args else 0
  1509→            if digits < 0 or digits > 100:

============================= 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: /home/user/mquickjs-python
configfile: pyproject.toml
collecting ... collected 1 item

tests/test_builtin_funcs.py::test_builtin_function[test_typed_array] XFAIL [100%]

============================== 1 xfailed in 0.24s ==============================

test_typed_array FAILED: Error: Uint8ClampedArray is not defined

76-        # RegExp constructor
77-        self._globals["RegExp"] = self._create_regexp_constructor()
78-
79-        # Function constructor
80-        self._globals["Function"] = self._create_function_constructor()
81-
82-        # Typed array constructors
83-        self._globals["Int32Array"] = self._create_typed_array_constructor("Int32Array")
84-        self._globals["Uint32Array"] = self._create_typed_array_constructor("Uint32Array")
85-        self._globals["Float64Array"] = self._create_typed_array_constructor("Float64Array")
86:        self._globals["Uint8Array"] = self._create_typed_array_constructor("Uint8Array")
87-        self._globals["Int8Array"] = self._create_typed_array_constructor("Int8Array")
88-        self._globals["Int16Array"] = self._create_typed_array_constructor("Int16Array")
89-        self._globals["Uint16Array"] = self._create_typed_array_constructor("Uint16Array")
90-
91-        # Global number functions
92-        self._globals["isNaN"] = self._global_isnan
93-        self._globals["isFinite"] = self._global_isfinite
94-        self._globals["parseInt"] = self._global_parseint
95-        self._globals["parseFloat"] = self._global_parsefloat
96-
--
915-        # Function.prototype - add basic methods
916-        fn_prototype = JSObject()
917-
918-        # These are implemented in VM's _get_property for JSFunction
919-        # but we still set them here for completeness
920-        fn_constructor.set("prototype", fn_prototype)
921-
922-        return fn_constructor
923-
924-    def _create_typed_array_constructor(self, name: str) -> JSCallableObject:
925:        """Create a typed array constructor (Int32Array, Uint8Array, etc.)."""
926-        from .values import (
927-            JSInt32Array, JSUint32Array, JSFloat64Array,
928:            JSUint8Array, JSInt8Array, JSInt16Array, JSUint16Array
929-        )
930-
931-        type_classes = {
932-            "Int32Array": JSInt32Array,
933-            "Uint32Array": JSUint32Array,
934-            "Float64Array": JSFloat64Array,
935:            "Uint8Array": JSUint8Array,
936-            "Int8Array": JSInt8Array,
937-            "Int16Array": JSInt16Array,
938-            "Uint16Array": JSUint16Array,
939-        }
940-
941-        array_class = type_classes[name]
942-
943-        def constructor_fn(*args):
944-            if not args:
945-                return array_class(0)

   515→        if isinstance(value, (int, float)):
   516→            v = int(value) & 0xFFFF
   517→            if v >= 0x8000:
   518→                v -= 0x10000
   519→            return v
   520→        return 0
   521→
   522→
   523→class JSUint16Array(JSTypedArray):
   524→    """JavaScript Uint16Array."""
   525→
   526→    _element_size = 2
   527→    _type_name = "Uint16Array"
   528→
   529→    def _coerce_value(self, value):
   530→        """Coerce to unsigned 16-bit integer."""
   531→        if isinstance(value, (int, float)):
   532→            return int(value) & 0xFFFF
   533→        return 0
   534→

<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 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:
   519→            return v
   520→        return 0
   521→
   522→
   523→class JSUint16Array(JSTypedArray):
   524→    """JavaScript Uint16Array."""
   525→
   526→    _element_size = 2
   527→    _type_name = "Uint16Array"
   528→
   529→    def _coerce_value(self, value):
   530→        """Coerce to unsigned 16-bit integer."""
   531→        if isinstance(value, (int, float)):
   532→            return int(value) & 0xFFFF
   533→        return 0
   534→
   535→
   536→class JSUint8ClampedArray(JSTypedArray):
   537→    """JavaScript Uint8ClampedArray."""
   538→
   539→    _element_size = 1
   540→    _type_name = "Uint8ClampedArray"
   541→
   542→    def _coerce_value(self, value):
   543→        """Coerce to clamped unsigned 8-bit integer (0-255)."""
   544→        if isinstance(value, (int, float)):
   545→            # Round half to even for 0.5 values
   546→            v = round(value)
   547→            # Clamp to 0-255
   548→            if v < 0:
   549→                return 0
   550→            if v > 255:
   551→                return 255
   552→            return v
   553→        return 0
   554→
   555→
   556→class JSFloat32Array(JSTypedArray):
   557→    """JavaScript Float32Array."""
   558→
   559→    _element_size = 4
   560→    _type_name = "Float32Array"
   561→
   562→    def _coerce_value(self, value):
   563→        """Coerce to 32-bit float."""
   564→        import struct
   565→        if isinstance(value, (int, float)):
   566→            # Convert to float32 and back to simulate precision loss
   567→            packed = struct.pack('f', float(value))
   568→            return struct.unpack('f', packed)[0]
   569→        return 0.0
   570→
   571→
   572→class JSArrayBuffer(JSObject):
   573→    """JavaScript ArrayBuffer - raw binary data buffer."""
   574→
   575→    def __init__(self, byte_length: int = 0):
   576→        super().__init__()
   577→        self._data = bytearray(byte_length)
   578→
   579→    @property
   580→    def byteLength(self) -> int:
   581→        return len(self._data)
   582→
   583→    def __repr__(self) -> str:
   584→        return f"ArrayBuffer({self.byteLength})"
   585→

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:
    78→
    79→        # Function constructor
    80→        self._globals["Function"] = self._create_function_constructor()
    81→
    82→        # Typed array constructors
    83→        self._globals["Int32Array"] = self._create_typed_array_constructor("Int32Array")
    84→        self._globals["Uint32Array"] = self._create_typed_array_constructor("Uint32Array")
    85→        self._globals["Float64Array"] = self._create_typed_array_constructor("Float64Array")
    86→        self._globals["Float32Array"] = self._create_typed_array_constructor("Float32Array")
    87→        self._globals["Uint8Array"] = self._create_typed_array_constructor("Uint8Array")
    88→        self._globals["Int8Array"] = self._create_typed_array_constructor("Int8Array")
    89→        self._globals["Int16Array"] = self._create_typed_array_constructor("Int16Array")
    90→        self._globals["Uint16Array"] = self._create_typed_array_constructor("Uint16Array")
    91→        self._globals["Uint8ClampedArray"] = self._create_typed_array_constructor("Uint8ClampedArray")
    92→
    93→        # ArrayBuffer constructor
    94→        self._globals["ArrayBuffer"] = self._create_arraybuffer_constructor()
    95→
    96→        # Global number functions
    97→        self._globals["isNaN"] = self._global_isnan
    98→        self._globals["isFinite"] = self._global_isfinite

   924→        # but we still set them here for completeness
   925→        fn_constructor.set("prototype", fn_prototype)
   926→
   927→        return fn_constructor
   928→
   929→    def _create_typed_array_constructor(self, name: str) -> JSCallableObject:
   930→        """Create a typed array constructor (Int32Array, Uint8Array, etc.)."""
   931→        from .values import (
   932→            JSInt32Array, JSUint32Array, JSFloat64Array,
   933→            JSUint8Array, JSInt8Array, JSInt16Array, JSUint16Array
   934→        )
   935→
   936→        type_classes = {
   937→            "Int32Array": JSInt32Array,
   938→            "Uint32Array": JSUint32Array,
   939→            "Float64Array": JSFloat64Array,
   940→            "Uint8Array": JSUint8Array,
   941→            "Int8Array": JSInt8Array,
   942→            "Int16Array": JSInt16Array,
   943→            "Uint16Array": JSUint16Array,
   944→        }
   945→
   946→        array_class = type_classes[name]
   947→
   948→        def constructor_fn(*args):
   949→            if not args:
   950→                return array_class(0)
   951→            arg = args[0]
   952→            if isinstance(arg, (int, float)):
   953→                # new Int32Array(length)
   954→                return array_class(int(arg))
   955→            # Could also support creating from array, but for now just length
   956→            return array_class(0)
   957→
   958→        constructor = JSCallableObject(constructor_fn)
   959→        constructor._name = name
   960→        return constructor
   961→
   962→    def _create_eval_function(self):
   963→        """Create the global eval function."""
   964→        ctx = self  # Reference for closure
   965→
   966→        def eval_fn(*args):
   967→            if not args:
   968→                return UNDEFINED
   969→            code = args[0]
   970→            if not isinstance(code, str):
   971→                # If not a string, return the argument unchanged
   972→                return code
   973→
   974→            try:
   975→                parser = Parser(code)
   976→                ast = parser.parse()
   977→                compiler = Compiler()
   978→                bytecode_module = compiler.compile(ast)
   979→
   980→                vm = VM(ctx.memory_limit, ctx.time_limit)
   981→                vm.globals = ctx._globals
   982→                return vm.run(bytecode_module)
   983→            except Exception as e:
   984→                from .errors import JSError
   985→                raise JSError(f"EvalError: {str(e)}")
   986→
   987→        return eval_fn
   988→
   989→    def _global_isnan(self, *args) -> bool:
   990→        """Global isNaN - converts argument to number first."""
   991→        x = to_number(args[0]) if args else float('nan')
   992→        return math.isnan(x)
   993→
   994→    def _global_isfinite(self, *args) -> bool:
   995→        """Global isFinite - converts argument to number first."""
   996→        x = to_number(args[0]) if args else float('nan')
   997→        return not (math.isnan(x) or math.isinf(x))
   998→
   999→    def _global_parseint(self, *args):
  1000→        """Global parseInt."""
  1001→        s = to_string(args[0]) if args else ""
  1002→        radix = int(to_number(args[1])) if len(args) > 1 else 10
  1003→        if radix == 0:

<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 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:
   925→        fn_constructor.set("prototype", fn_prototype)
   926→
   927→        return fn_constructor
   928→
   929→    def _create_typed_array_constructor(self, name: str) -> JSCallableObject:
   930→        """Create a typed array constructor (Int32Array, Uint8Array, etc.)."""
   931→        from .values import (
   932→            JSInt32Array, JSUint32Array, JSFloat64Array, JSFloat32Array,
   933→            JSUint8Array, JSInt8Array, JSInt16Array, JSUint16Array,
   934→            JSUint8ClampedArray, JSArrayBuffer, JSArray
   935→        )
   936→
   937→        type_classes = {
   938→            "Int32Array": JSInt32Array,
   939→            "Uint32Array": JSUint32Array,
   940→            "Float64Array": JSFloat64Array,
   941→            "Float32Array": JSFloat32Array,
   942→            "Uint8Array": JSUint8Array,
   943→            "Int8Array": JSInt8Array,
   944→            "Int16Array": JSInt16Array,
   945→            "Uint16Array": JSUint16Array,
   946→            "Uint8ClampedArray": JSUint8ClampedArray,
   947→        }
   948→
   949→        array_class = type_classes[name]
   950→
   951→        def constructor_fn(*args):
   952→            if not args:
   953→                return array_class(0)
   954→            arg = args[0]
   955→            if isinstance(arg, (int, float)):
   956→                # new Int32Array(length)
   957→                return array_class(int(arg))
   958→            elif isinstance(arg, JSArrayBuffer):
   959→                # new Int32Array(buffer, byteOffset?, length?)
   960→                buffer = arg
   961→                byte_offset = int(args[1]) if len(args) > 1 else 0
   962→                element_size = array_class._element_size
   963→
   964→                if len(args) > 2:
   965→                    length = int(args[2])
   966→                else:
   967→                    length = (buffer.byteLength - byte_offset) // element_size
   968→
   969→                result = array_class(length)
   970→                result._buffer = buffer
   971→                result._byte_offset = byte_offset
   972→
   973→                # Read values from buffer
   974→                import struct
   975→                for i in range(length):
   976→                    offset = byte_offset + i * element_size
   977→                    if name in ("Float32Array", "Float64Array"):
   978→                        fmt = 'f' if element_size == 4 else 'd'
   979→                        val = struct.unpack(fmt, bytes(buffer._data[offset:offset+element_size]))[0]
   980→                    else:
   981→                        val = int.from_bytes(buffer._data[offset:offset+element_size], 'little', signed='Int' in name)
   982→                    result._data[i] = result._coerce_value(val)
   983→
   984→                return result
   985→            elif isinstance(arg, JSArray):
   986→                # new Int32Array([1, 2, 3])
   987→                length = arg.length
   988→                result = array_class(length)
   989→                for i in range(length):
   990→                    result.set_index(i, arg.get_index(i))
   991→                return result
   992→            return array_class(0)
   993→
   994→        constructor = JSCallableObject(constructor_fn)
   995→        constructor._name = name
   996→        return constructor
   997→
   998→    def _create_arraybuffer_constructor(self) -> JSCallableObject:
   999→        """Create the ArrayBuffer constructor."""
  1000→        from .values import JSArrayBuffer
  1001→
  1002→        def constructor_fn(*args):
  1003→            length = int(args[0]) if args else 0
  1004→            return JSArrayBuffer(length)
  1005→
  1006→        constructor = JSCallableObject(constructor_fn)
  1007→        constructor._name = "ArrayBuffer"
  1008→        return constructor
  1009→
  1010→    def _create_eval_function(self):
  1011→        """Create the global eval function."""
  1012→        ctx = self  # Reference for closure

   888→        if obj is UNDEFINED or obj is NULL:
   889→            raise JSTypeError(f"Cannot read property of {obj}")
   890→
   891→        key_str = to_string(key) if not isinstance(key, str) else key
   892→
   893→        if isinstance(obj, JSTypedArray):
   894→            # Typed array index access
   895→            try:
   896→                idx = int(key_str)
   897→                if idx >= 0:
   898→                    return obj.get_index(idx)
   899→            except ValueError:
   900→                pass
   901→            if key_str == "length":
   902→                return obj.length
   903→            if key_str == "BYTES_PER_ELEMENT":
   904→                return obj._element_size
   905→            if key_str == "buffer":
   906→                # Return the underlying buffer if it exists
   907→                return getattr(obj, '_buffer', UNDEFINED)
   908→            # Built-in typed array methods
   909→            typed_array_methods = ["toString", "join", "subarray", "set"]
   910→            if key_str in typed_array_methods:
   911→                return self._make_typed_array_method(obj, key_str)
   912→            return obj.get(key_str)
   913→
   914→        if isinstance(obj, JSArray):
   915→            # Array index access
   916→            try:
   917→                idx = int(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>

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:
     6→from dataclasses import dataclass
     7→
     8→from .opcodes import OpCode
     9→from .compiler import CompiledFunction
    10→from .values import (
    11→    UNDEFINED, NULL, JSUndefined, JSNull, JSValue,
    12→    JSObject, JSArray, JSFunction, JSRegExp, JSTypedArray, JSArrayBuffer,
    13→    to_boolean, to_number, to_string, js_typeof,
    14→)
    15→from .errors import (
    16→    JSError, JSTypeError, JSReferenceError,
    17→    MemoryLimitError, TimeLimitError,
    18→)

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:
   889→            raise JSTypeError(f"Cannot read property of {obj}")
   890→
   891→        key_str = to_string(key) if not isinstance(key, str) else key
   892→
   893→        if isinstance(obj, JSArrayBuffer):
   894→            if key_str == "byteLength":
   895→                return obj.byteLength
   896→            return obj.get(key_str)
   897→
   898→        if isinstance(obj, JSTypedArray):
   899→            # Typed array index access
   900→            try:
   901→                idx = int(key_str)
   902→                if idx >= 0:
   903→                    return obj.get_index(idx)
   904→            except ValueError:
   905→                pass
   906→            if key_str == "length":
   907→                return obj.length
   908→            if key_str == "BYTES_PER_ELEMENT":
   909→                return obj._element_size
   910→            if key_str == "buffer":
   911→                # Return the underlying buffer if it exists
   912→                return getattr(obj, '_buffer', UNDEFINED)
   913→            # Built-in typed array methods
   914→            typed_array_methods = ["toString", "join", "subarray", "set"]
   915→            if key_str in typed_array_methods:
   916→                return self._make_typed_array_method(obj, key_str)
   917→            return obj.get(key_str)
   918→
   919→        if isinstance(obj, JSArray):
   920→            # Array index access
   921→            try:

test_typed_array FAILED: Error: assertion failed: got string:|0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0|, expected string:|0,0,255,255,0,0,0,0,0,0,128,63,255,255,255,255|

   402→class JSTypedArray(JSObject):
   403→    """Base class for JavaScript typed arrays."""
   404→
   405→    # Subclasses override these
   406→    _element_size = 1  # bytes per element
   407→    _type_name = "TypedArray"
   408→
   409→    def __init__(self, length: int = 0):
   410→        super().__init__()
   411→        self._data = [0] * length
   412→
   413→    @property
   414→    def length(self) -> int:
   415→        return len(self._data)
   416→
   417→    def get_index(self, index: int):
   418→        if 0 <= index < len(self._data):
   419→            return self._data[index]
   420→        return UNDEFINED
   421→
   422→    def set_index(self, index: int, value) -> None:
   423→        if 0 <= index < len(self._data):
   424→            self._data[index] = self._coerce_value(value)
   425→
   426→    def _coerce_value(self, value):
   427→        """Coerce value to the appropriate type. Override in subclasses."""
   428→        return int(value) if isinstance(value, (int, float)) else 0
   429→
   430→    def __repr__(self) -> str:
   431→        return f"{self._type_name}({self._data})"
   432→
   433→
   434→class JSInt32Array(JSTypedArray):
   435→    """JavaScript Int32Array."""
   436→

<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 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:
   398→    def __call__(self, this_val, *args):
   399→        return self._fn(this_val, *args)
   400→
   401→
   402→class JSTypedArray(JSObject):
   403→    """Base class for JavaScript typed arrays."""
   404→
   405→    # Subclasses override these
   406→    _element_size = 1  # bytes per element
   407→    _type_name = "TypedArray"
   408→    _signed = False
   409→
   410→    def __init__(self, length: int = 0):
   411→        super().__init__()
   412→        self._data = [0] * length
   413→        self._buffer = None
   414→        self._byte_offset = 0
   415→
   416→    @property
   417→    def length(self) -> int:
   418→        return len(self._data)
   419→
   420→    def get_index(self, index: int):
   421→        if 0 <= index < len(self._data):
   422→            if self._buffer is not None:
   423→                # Read from buffer
   424→                return self._read_from_buffer(index)
   425→            return self._data[index]
   426→        return UNDEFINED
   427→
   428→    def set_index(self, index: int, value) -> None:
   429→        if 0 <= index < len(self._data):
   430→            coerced = self._coerce_value(value)
   431→            self._data[index] = coerced
   432→            if self._buffer is not None:
   433→                # Write to buffer
   434→                self._write_to_buffer(index, coerced)
   435→
   436→    def _read_from_buffer(self, index: int):
   437→        """Read a value from the underlying buffer."""
   438→        import struct
   439→        offset = self._byte_offset + index * self._element_size
   440→        data = bytes(self._buffer._data[offset:offset + self._element_size])
   441→        if len(data) < self._element_size:
   442→            return 0
   443→        return self._unpack_value(data)
   444→
   445→    def _write_to_buffer(self, index: int, value) -> None:
   446→        """Write a value to the underlying buffer."""
   447→        import struct
   448→        offset = self._byte_offset + index * self._element_size
   449→        packed = self._pack_value(value)
   450→        for i, b in enumerate(packed):
   451→            self._buffer._data[offset + i] = b
   452→
   453→    def _unpack_value(self, data: bytes):
   454→        """Unpack bytes to a value. Override in subclasses for float types."""
   455→        return int.from_bytes(data, 'little', signed=self._signed)
   456→
   457→    def _pack_value(self, value) -> bytes:
   458→        """Pack a value to bytes. Override in subclasses for float types."""
   459→        return int(value).to_bytes(self._element_size, 'little', signed=self._signed)
   460→
   461→    def _coerce_value(self, value):
   462→        """Coerce value to the appropriate type. Override in subclasses."""
   463→        return int(value) if isinstance(value, (int, float)) else 0
   464→
   465→    def __repr__(self) -> str:
   466→        return f"{self._type_name}({self._data})"
   467→
   468→
   469→class JSInt32Array(JSTypedArray):
   470→    """JavaScript Int32Array."""

   469→class JSInt32Array(JSTypedArray):
   470→    """JavaScript Int32Array."""
   471→
   472→    _element_size = 4
   473→    _type_name = "Int32Array"
   474→
   475→    def _coerce_value(self, value):
   476→        """Coerce to signed 32-bit integer."""
   477→        if isinstance(value, (int, float)):
   478→            v = int(value)
   479→            # Handle overflow to signed 32-bit
   480→            v = v & 0xFFFFFFFF
   481→            if v >= 0x80000000:
   482→                v -= 0x100000000
   483→            return v
   484→        return 0
   485→
   486→
   487→class JSUint32Array(JSTypedArray):
   488→    """JavaScript Uint32Array."""
   489→
   490→    _element_size = 4
   491→    _type_name = "Uint32Array"
   492→
   493→    def _coerce_value(self, value):
   494→        """Coerce to unsigned 32-bit integer."""
   495→        if isinstance(value, (int, float)):
   496→            return int(value) & 0xFFFFFFFF
   497→        return 0
   498→
   499→
   500→class JSFloat64Array(JSTypedArray):
   501→    """JavaScript Float64Array."""
   502→
   503→    _element_size = 8
   504→    _type_name = "Float64Array"
   505→
   506→    def _coerce_value(self, value):
   507→        """Coerce to float."""
   508→        if isinstance(value, (int, float)):
   509→            return float(value)
   510→        return 0.0
   511→
   512→
   513→class JSUint8Array(JSTypedArray):
   514→    """JavaScript Uint8Array."""
   515→
   516→    _element_size = 1
   517→    _type_name = "Uint8Array"
   518→
   519→    def _coerce_value(self, value):
   520→        """Coerce to unsigned 8-bit integer."""
   521→        if isinstance(value, (int, float)):
   522→            return int(value) & 0xFF
   523→        return 0
   524→
   525→
   526→class JSInt8Array(JSTypedArray):
   527→    """JavaScript Int8Array."""
   528→
   529→    _element_size = 1
   530→    _type_name = "Int8Array"
   531→
   532→    def _coerce_value(self, value):
   533→        """Coerce to signed 8-bit integer."""
   534→        if isinstance(value, (int, float)):
   535→            v = int(value) & 0xFF
   536→            if v >= 0x80:
   537→                v -= 0x100
   538→            return v
   539→        return 0
   540→
   541→
   542→class JSInt16Array(JSTypedArray):
   543→    """JavaScript Int16Array."""
   544→
   545→    _element_size = 2
   546→    _type_name = "Int16Array"
   547→
   548→    def _coerce_value(self, value):
   549→        """Coerce to signed 16-bit integer."""
   550→        if isinstance(value, (int, float)):
   551→            v = int(value) & 0xFFFF
   552→            if v >= 0x8000:
   553→                v -= 0x10000
   554→            return v
   555→        return 0
   556→
   557→
   558→class JSUint16Array(JSTypedArray):
   559→    """JavaScript Uint16Array."""
   560→
   561→    _element_size = 2
   562→    _type_name = "Uint16Array"
   563→
   564→    def _coerce_value(self, value):
   565→        """Coerce to unsigned 16-bit integer."""
   566→        if isinstance(value, (int, float)):
   567→            return int(value) & 0xFFFF
   568→        return 0

<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 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:
   465→    def __repr__(self) -> str:
   466→        return f"{self._type_name}({self._data})"
   467→
   468→
   469→class JSInt32Array(JSTypedArray):
   470→    """JavaScript Int32Array."""
   471→
   472→    _element_size = 4
   473→    _type_name = "Int32Array"
   474→    _signed = True
   475→
   476→    def _coerce_value(self, value):
   477→        """Coerce to signed 32-bit integer."""
   478→        if isinstance(value, (int, float)):
   479→            v = int(value)
   480→            # Handle overflow to signed 32-bit
   481→            v = v & 0xFFFFFFFF
   482→            if v >= 0x80000000:
   483→                v -= 0x100000000
   484→            return v
   485→        return 0
   486→
   487→
   488→class JSUint32Array(JSTypedArray):
   489→    """JavaScript Uint32Array."""
   490→
   491→    _element_size = 4
   492→    _type_name = "Uint32Array"
   493→    _signed = False
   494→
   495→    def _coerce_value(self, value):
   496→        """Coerce to unsigned 32-bit integer."""
   497→        if isinstance(value, (int, float)):
   498→            return int(value) & 0xFFFFFFFF
   499→        return 0
   500→
   501→
   502→class JSFloat64Array(JSTypedArray):
   503→    """JavaScript Float64Array."""
   504→
   505→    _element_size = 8
   506→    _type_name = "Float64Array"
   507→    _signed = False
   508→
   509→    def _coerce_value(self, value):
   510→        """Coerce to float."""
   511→        if isinstance(value, (int, float)):
   512→            return float(value)
   513→        return 0.0
   514→
   515→    def _unpack_value(self, data: bytes):
   516→        """Unpack bytes to float64."""
   517→        import struct
   518→        return struct.unpack('<d', data)[0]
   519→
   520→    def _pack_value(self, value) -> bytes:
   521→        """Pack float64 to bytes."""
   522→        import struct
   523→        return struct.pack('<d', float(value))
   524→
   525→
   526→class JSUint8Array(JSTypedArray):
   527→    """JavaScript Uint8Array."""
   528→
   529→    _element_size = 1
   530→    _type_name = "Uint8Array"
   531→    _signed = False
   532→
   533→    def _coerce_value(self, value):
   534→        """Coerce to unsigned 8-bit integer."""
   535→        if isinstance(value, (int, float)):
   536→            return int(value) & 0xFF
   537→        return 0
   538→
   539→
   540→class JSInt8Array(JSTypedArray):
   541→    """JavaScript Int8Array."""
   542→
   543→    _element_size = 1
   544→    _type_name = "Int8Array"
   545→    _signed = True
   546→
   547→    def _coerce_value(self, value):
   548→        """Coerce to signed 8-bit integer."""
   549→        if isinstance(value, (int, float)):
   550→            v = int(value) & 0xFF
   551→            if v >= 0x80:
   552→                v -= 0x100
   553→            return v
   554→        return 0
   555→
   556→
   557→class JSInt16Array(JSTypedArray):
   558→    """JavaScript Int16Array."""
   559→
   560→    _element_size = 2
   561→    _type_name = "Int16Array"
   562→    _signed = True
   563→
   564→    def _coerce_value(self, value):
   565→        """Coerce to signed 16-bit integer."""
   566→        if isinstance(value, (int, float)):
   567→            v = int(value) & 0xFFFF
   568→            if v >= 0x8000:
   569→                v -= 0x10000
   570→            return v
   571→        return 0
   572→
   573→
   574→class JSUint16Array(JSTypedArray):
   575→    """JavaScript Uint16Array."""
   576→
   577→    _element_size = 2
   578→    _type_name = "Uint16Array"
   579→    _signed = False
   580→
   581→    def _coerce_value(self, value):
   582→        """Coerce to unsigned 16-bit integer."""
   583→        if isinstance(value, (int, float)):
   584→            return int(value) & 0xFFFF
   585→        return 0
   586→
   587→
   588→class JSUint8ClampedArray(JSTypedArray):
   589→    """JavaScript Uint8ClampedArray."""

   600→            if v < 0:
   601→                return 0
   602→            if v > 255:
   603→                return 255
   604→            return v
   605→        return 0
   606→
   607→
   608→class JSFloat32Array(JSTypedArray):
   609→    """JavaScript Float32Array."""
   610→
   611→    _element_size = 4
   612→    _type_name = "Float32Array"
   613→
   614→    def _coerce_value(self, value):
   615→        """Coerce to 32-bit float."""
   616→        import struct
   617→        if isinstance(value, (int, float)):
   618→            # Convert to float32 and back to simulate precision loss
   619→            packed = struct.pack('f', float(value))
   620→            return struct.unpack('f', packed)[0]
   621→        return 0.0
   622→
   623→
   624→class JSArrayBuffer(JSObject):
   625→    """JavaScript ArrayBuffer - raw binary data buffer."""
   626→
   627→    def __init__(self, byte_length: int = 0):
   628→        super().__init__()
   629→        self._data = bytearray(byte_length)
   630→
   631→    @property
   632→    def byteLength(self) -> int:
   633→        return len(self._data)
   634→
   635→    def __repr__(self) -> str:
   636→        return f"ArrayBuffer({self.byteLength})"
   637→

<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 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:
   604→            return v
   605→        return 0
   606→
   607→
   608→class JSFloat32Array(JSTypedArray):
   609→    """JavaScript Float32Array."""
   610→
   611→    _element_size = 4
   612→    _type_name = "Float32Array"
   613→    _signed = False
   614→
   615→    def _coerce_value(self, value):
   616→        """Coerce to 32-bit float."""
   617→        import struct
   618→        if isinstance(value, (int, float)):
   619→            # Convert to float32 and back to simulate precision loss
   620→            packed = struct.pack('<f', float(value))
   621→            return struct.unpack('<f', packed)[0]
   622→        return 0.0
   623→
   624→    def _unpack_value(self, data: bytes):
   625→        """Unpack bytes to float32."""
   626→        import struct
   627→        return struct.unpack('<f', data)[0]
   628→
   629→    def _pack_value(self, value) -> bytes:
   630→        """Pack float32 to bytes."""
   631→        import struct
   632→        return struct.pack('<f', float(value))
   633→
   634→
   635→class JSArrayBuffer(JSObject):
   636→    """JavaScript ArrayBuffer - raw binary data buffer."""

test_typed_array PASSED

The file /home/user/mquickjs-python/tests/test_builtin_funcs.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    58→# Get the function code once (it's the same for all tests)
    59→_TEST_CASES = get_builtin_test_cases()
    60→_FUNC_CODE = _TEST_CASES[0][1] if _TEST_CASES else ""
    61→
    62→# Tests that are known to pass
    63→PASSING_TESTS = {
    64→    "test",
    65→    "test_string",
    66→    "test_string2",
    67→    "test_array",
    68→    "test_array_ext",
    69→    "test_enum",
    70→    "test_function",
    71→    "test_number",
    72→    "test_math",
    73→    "test_json",
    74→    "test_typed_array",
    75→}
    76→
    77→# Tests that are known to fail (with reasons)
    78→FAILING_TESTS = {
    79→    "test_global_eval": "Indirect eval doesn't create global variables",
    80→    "test_regexp": "Invalid control character escape in regex",
    81→    "test_line_column_numbers": "Line/column tracking not implemented",
    82→    "test_large_eval_parse_stack": "Large parsing stack not tested",
    83→}
    84→
    85→
    86→@pytest.mark.parametrize(
    87→    "func_name",

============================= 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: /home/user/mquickjs-python
configfile: pyproject.toml
collecting ... collected 15 items

tests/test_builtin_funcs.py::test_builtin_function[test_function] PASSED [  6%]
tests/test_builtin_funcs.py::test_builtin_function[test] PASSED          [ 13%]
tests/test_builtin_funcs.py::test_builtin_function[test_enum] PASSED     [ 20%]
tests/test_builtin_funcs.py::test_builtin_function[test_array] PASSED    [ 26%]
tests/test_builtin_funcs.py::test_builtin_function[test_array_ext] PASSED [ 33%]
tests/test_builtin_funcs.py::test_builtin_function[test_string] PASSED   [ 40%]
tests/test_builtin_funcs.py::test_builtin_function[test_string2] PASSED  [ 46%]
tests/test_builtin_funcs.py::test_builtin_function[test_math] PASSED     [ 53%]
tests/test_builtin_funcs.py::test_builtin_function[test_number] PASSED   [ 60%]
tests/test_builtin_funcs.py::test_builtin_function[test_global_eval] XFAIL [ 66%]
tests/test_builtin_funcs.py::test_builtin_function[test_typed_array] PASSED [ 73%]
tests/test_builtin_funcs.py::test_builtin_function[test_json] PASSED     [ 80%]
tests/test_builtin_funcs.py::test_builtin_function[test_large_eval_parse_stack] XFAIL [ 86%]
tests/test_builtin_funcs.py::test_builtin_function[test_regexp] XFAIL    [ 93%]
tests/test_builtin_funcs.py::test_builtin_function[test_line_column_numbers] XFAIL [100%]

======================== 11 passed, 4 xfailed in 0.88s =========================

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

 src/mquickjs_python/context.py |  59 +++++++++++++++++++--
 src/mquickjs_python/values.py  | 116 ++++++++++++++++++++++++++++++++++++++++-
 src/mquickjs_python/vm.py      |  67 +++++++++++++++++++++++-
 tests/test_builtin_funcs.py    |   2 +-
 4 files changed, 238 insertions(+), 6 deletions(-)

4 files changed, 238 insertions(+), 6 deletions(-)

branch 'claude/python-mquickjs-port-uPKcc' set up to track 'origin/claude/python-mquickjs-port-uPKcc'.
To http://127.0.0.1:49259/git/simonw/mquickjs-python
   4b5c19c..6229c9c  claude/python-mquickjs-port-uPKcc -> claude/python-mquickjs-port-uPKcc

tests/test_parser.py ................................................... [ 54%]
........                                                                 [ 55%]
tests/test_rect.py .....                                                 [ 57%]
tests/test_regex.py .................................................... [ 69%]
....................................                                     [ 77%]
tests/test_string_regex.py ................................              [ 84%]
tests/test_vm.py ....................................................... [ 97%]
..........                                                               [100%]

======================= 425 passed, 6 xfailed in 18.35s ========================

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

tests/test_builtin_funcs.py::test_builtin_function[test_global_eval] XFAIL [  5%]
tests/test_builtin_funcs.py::test_builtin_function[test_large_eval_parse_stack] XFAIL [  6%]
tests/test_builtin_funcs.py::test_builtin_function[test_regexp] XFAIL    [  6%]
tests/test_builtin_funcs.py::test_builtin_function[test_line_column_numbers] XFAIL [  6%]
tests/test_js_basic.py::test_mquickjs_js[microbench.js-path0] XFAIL      [ 25%]
tests/test_js_basic.py::test_mquickjs_js[test_builtin.js-path1] XFAIL    [ 25%]
======================= 425 passed, 6 xfailed in 17.78s ========================

   464→function test_global_eval()
   465→{
   466→    var r, g_eval = (1,eval);
   467→
   468→    r = g_eval("1+1;");
   469→    assert(r, 2, "eval");
   470→
   471→    /* z is created as a global variable */
   472→    r = g_eval("var z=2; z;");
   473→    assert(r, 2, "eval");
   474→    assert(z, 2);
   475→    
   476→    assert(g_eval("if (1) 2; else 3;"), 2);
   477→    assert(g_eval("if (0) 2; else 3;"), 3);
   478→
   479→    z = 2;
   480→    assert(g_eval("z"), 2);
   481→
   482→    g_eval("z = 3");
   483→    assert(z, 3);
   484→}
   485→
   486→function test_typed_array()
   487→{
   488→    var buffer, a, i;
   489→
   490→    a = new Uint8Array(4);
   491→    assert(a.length, 4);
   492→    for(i = 0; i < a.length; i++)
   493→        a[i] = i;

<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>

No matches found

626-    assert(a[1234], "str");
627-    assert(JSON.stringify(a), s);
628-
629-    assert(JSON.stringify({x: 1, y: undefined, z:2}), '{"x":1,"z":2}');
630-
631-    /* larger stack */
632-    n = 100;
633-    s = repeat("[", n) + repeat("]", n);
634-    a = JSON.parse(s);
635-    assert(JSON.stringify(a), s);
636-
637-//    assert_json_error('\n"  \\@x"');
638-/    assert_json_error('\n{ "a": @x }"');
639-}
640-
641-function test_large_eval_parse_stack()
642-{
643-    var n = 1000;
644-    var str;
645-    
646-    str = repeat("(", n) + "1" + repeat(")", n);
647-    assert((1,eval)(str), 1);
648-    
649-    str = repeat("{", n) + "1;" + repeat("}", n);
650-    assert((1,eval)(str), 1);
651-    
652-    str = repeat("[", n) + "1" + repeat("]", n) + repeat("[0]", n);
653-    assert((1,eval)(str), 1);
654-}
655-
656:function test_regexp()
657-{
658-    var a, str, n;
659-
660-    str = "abbbbbc";
661-    a = /(b+)c/.exec(str);
662-    assert(a[0], "bbbbbc");
663-    assert(a[1], "bbbbb");
664-    assert(a.index, 1);
665-    assert(a.input, str);
666-    a = /(b+)c/.test(str);
667-    assert(a, true);
668-    assert(/\x61/.exec("a")[0], "a");
669-    assert(/\u0061/.exec("a")[0], "a");
670-    assert(/\ca/.exec("\x01")[0], "\x01");
671-    assert(/\\a/.exec("\\a")[0], "\\a");
672-    assert(/\c0/.exec("\\c0")[0], "\\c0");
673-
674-    a = /(\.(?=com|org)|\/)/.exec("ah.com");
675-    assert(a.index === 2 && a[0] === ".");
676-
677-    a = /(\.(?!com|org)|\/)/.exec("ah.com");
678-    assert(a, null);
679-
680-    a = /(?=(a+))/.exec("baaabac");
681-    assert(a.index === 1 && a[0] === "" && a[1] === "aaa");
682-
683-    a = /(z)((a+)?(b+)?(c))*/.exec("zaacbbbcac");
684-    assert(a, ["zaacbbbcac","z","ac","a", undefined,"c"]);
685-
686-//    a = (1,eval)("/\0a/");

✓ /(b+)c/.exec("abbbbbc")                  = ['bbbbbc', 'bbbbb']
✓ /\x61/.exec("a")[0]                      = a
✓ /\u0061/.exec("a")[0]                    = a
✓ /\ca/.exec("\x01")                       = ['\x01']

✗ /\c0/.exec("\\c0")                                          : Invalid control character escape
✓ /\\a/.exec("\\a")                                            = ['\\a']
✓ /(z)((a+)?(b+)?(c))*/.exec("zaacbbbcac")                     = ['zaacbbbcac', 'z', 'ac', 'a', 'bbb', 'c']

/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-451-        # Hex escape
src/mquickjs_python/regex/parser.py-452-        if ch == 'x':
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-453-            return self._parse_hex_escape()
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-454-
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-455-        # Control character
src/mquickjs_python/regex/parser.py-456-        if ch == 'c':
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-457-            ctrl = self._peek()
src/mquickjs_python/regex/parser.py-458-            if ctrl is not None and (ctrl.isalpha()):
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-459-                self._advance()
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-460-                return Char(chr(ord(ctrl.upper()) - 64))
src/mquickjs_python/regex/parser.py:461:            raise RegExpError("Invalid control character escape")
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-462-
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-463-        # Simple escapes
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-464-        escape_map = {
src/mquickjs_python/regex/parser.py-465-            'n': '\n', 't': '\t', 'r': '\r', 'f': '\f', 'v': '\v',
src/mquickjs_python/regex/parser.py-466-            '0': '\0',
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-467-        }
src/mquickjs_python/regex/parser.py-468-        if ch in escape_map:
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-469-            return Char(escape_map[ch])
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-470-
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py-471-        # Identity escape (literal)

   450→
   451→        # Hex escape
   452→        if ch == 'x':
   453→            return self._parse_hex_escape()
   454→
   455→        # Control character
   456→        if ch == 'c':
   457→            ctrl = self._peek()
   458→            if ctrl is not None and (ctrl.isalpha()):
   459→                self._advance()
   460→                return Char(chr(ord(ctrl.upper()) - 64))
   461→            raise RegExpError("Invalid control character escape")
   462→
   463→        # Simple escapes
   464→        escape_map = {
   465→            'n': '\n', 't': '\t', 'r': '\r', 'f': '\f', 'v': '\v',
   466→            '0': '\0',
   467→        }
   468→        if ch in escape_map:
   469→            return Char(escape_map[ch])
   470→
   471→        # Identity escape (literal)
   472→        return Char(ch)
   473→
   474→    def _parse_unicode_escape(self) -> Char:
   475→        """Parse \\uXXXX or \\u{XXXX} escape."""
   476→        if self._peek() == '{':
   477→            # \u{XXXX} form
   478→            self._advance()
   479→            hex_digits = ''

<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>

16:from dataclasses import dataclass, field
17:from typing import List, Optional, Tuple, Union

[Showing results with pagination = limit: 20, offset: 0]

No matches found

     1→"""
     2→Regex pattern parser.
     3→
     4→Parses JavaScript regex patterns into an AST for compilation.
     5→Grammar (simplified):
     6→    Pattern     ::= Disjunction
     7→    Disjunction ::= Alternative ('|' Alternative)*
     8→    Alternative ::= Term*
     9→    Term        ::= Assertion | Atom Quantifier?
    10→    Assertion   ::= '^' | '$' | '\\b' | '\\B' | Lookahead | Lookbehind
    11→    Atom        ::= PatternChar | '.' | CharClass | '(' Disjunction ')' | Escape
    12→    Quantifier  ::= ('*' | '+' | '?' | '{' n (',' n?)? '}') '?'?
    13→    CharClass   ::= '[' '^'? ClassRanges ']'
    14→"""
    15→
    16→from dataclasses import dataclass, field
    17→from typing import List, Optional, Tuple, Union
    18→
    19→
    20→class RegExpError(Exception):
    21→    """Exception raised for regex parsing errors."""
    22→    pass
    23→
    24→
    25→# AST Node Types
    26→
    27→@dataclass
    28→class Char:
    29→    """Literal character."""
    30→    char: str
    31→
    32→
    33→@dataclass
    34→class Dot:
    35→    """Match any character (except newline by default)."""
    36→    pass
    37→
    38→
    39→@dataclass
    40→class CharClass:
    41→    """Character class like [a-z]."""
    42→    ranges: List[Tuple[str, str]]  # List of (start, end) ranges
    43→    negated: bool = False
    44→
    45→
    46→@dataclass
    47→class Shorthand:
    48→    """Shorthand character class like \\d, \\w, \\s."""
    49→    type: str  # 'd', 'D', 'w', 'W', 's', 'S'
    50→
    51→
    52→@dataclass
    53→class Anchor:
    54→    """Anchor like ^, $, \\b, \\B."""
    55→    type: str  # 'start', 'end', 'boundary', 'not_boundary'
    56→
    57→
    58→@dataclass
    59→class Backref:
    60→    """Backreference like \\1."""
    61→    group: int
    62→
    63→
    64→@dataclass
    65→class Group:
    66→    """Capturing or non-capturing group."""
    67→    body: 'Node'
    68→    capturing: bool = True
    69→    group_index: int = 0
    70→
    71→
    72→@dataclass
    73→class Lookahead:
    74→    """Lookahead assertion (?=...) or (?!...)."""
    75→    body: 'Node'
    76→    positive: bool = True
    77→
    78→
    79→@dataclass
    80→class Lookbehind:

<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>

    80→class Lookbehind:
    81→    """Lookbehind assertion (?<=...) or (?<!...)."""
    82→    body: 'Node'
    83→    positive: bool = True
    84→
    85→
    86→@dataclass
    87→class Quantifier:
    88→    """Quantifier like *, +, ?, {n,m}."""
    89→    body: 'Node'
    90→    min: int
    91→    max: int  # -1 means unlimited
    92→    greedy: bool = True
    93→
    94→
    95→@dataclass
    96→class Alternative:
    97→    """Sequence of terms (AND)."""
    98→    terms: List['Node']
    99→
   100→
   101→@dataclass
   102→class Disjunction:
   103→    """Alternation (OR)."""
   104→    alternatives: List['Node']
   105→
   106→
   107→# Union type for all nodes
   108→Node = Union[Char, Dot, CharClass, Shorthand, Anchor, Backref,
   109→             Group, Lookahead, Lookbehind, Quantifier, Alternative, Disjunction]
   110→
   111→
   112→class RegexParser:
   113→    """Parser for JavaScript regex patterns."""
   114→
   115→    def __init__(self, pattern: str, flags: str = ""):
   116→        self.pattern = pattern
   117→        self.flags = flags
   118→        self.pos = 0
   119→        self.group_count = 0
   120→        self.unicode = 'u' in flags
   121→
   122→    def parse(self) -> Tuple[Node, int]:
   123→        """
   124→        Parse the pattern and return (AST, capture_count).
   125→        """
   126→        self.pos = 0
   127→        self.group_count = 0
   128→
   129→        if not self.pattern:

<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 file /home/user/mquickjs-python/src/mquickjs_python/regex/parser.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   451→        # Hex escape
   452→        if ch == 'x':
   453→            return self._parse_hex_escape()
   454→
   455→        # Control character
   456→        if ch == 'c':
   457→            ctrl = self._peek()
   458→            if ctrl is not None and (ctrl.isalpha()):
   459→                self._advance()
   460→                return Char(chr(ord(ctrl.upper()) - 64))
   461→            # Non-letter after \c: treat as literal \c (backslash + c)
   462→            return Alternative([Char('\\'), Char('c')])
   463→
   464→        # Simple escapes
   465→        escape_map = {
   466→            'n': '\n', 't': '\t', 'r': '\r', 'f': '\f', 'v': '\v',

✓ /\c0/.exec("\\c0") = ['\\c0']

test_regexp FAILED: Error: assertion failed: got boolean:|false|, expected boolean:|true|

   656→function test_regexp()
   657→{
   658→    var a, str, n;
   659→
   660→    str = "abbbbbc";
   661→    a = /(b+)c/.exec(str);
   662→    assert(a[0], "bbbbbc");
   663→    assert(a[1], "bbbbb");
   664→    assert(a.index, 1);
   665→    assert(a.input, str);
   666→    a = /(b+)c/.test(str);
   667→    assert(a, true);
   668→    assert(/\x61/.exec("a")[0], "a");
   669→    assert(/\u0061/.exec("a")[0], "a");
   670→    assert(/\ca/.exec("\x01")[0], "\x01");
   671→    assert(/\\a/.exec("\\a")[0], "\\a");
   672→    assert(/\c0/.exec("\\c0")[0], "\\c0");
   673→
   674→    a = /(\.(?=com|org)|\/)/.exec("ah.com");
   675→    assert(a.index === 2 && a[0] === ".");
   676→
   677→    a = /(\.(?!com|org)|\/)/.exec("ah.com");
   678→    assert(a, null);
   679→
   680→    a = /(?=(a+))/.exec("baaabac");
   681→    assert(a.index === 1 && a[0] === "" && a[1] === "aaa");
   682→
   683→    a = /(z)((a+)?(b+)?(c))*/.exec("zaacbbbcac");
   684→    assert(a, ["zaacbbbcac","z","ac","a", undefined,"c"]);
   685→
   686→//    a = (1,eval)("/\0a/");
   687→//    assert(a.toString(), "/\0a/");
   688→//    assert(a.exec("\0a")[0], "\0a");
   689→
   690→//    assert(/{1a}/.toString(), "/{1a}/");
   691→//    a = /a{1+/.exec("a{11");
   692→//    assert(a, ["a{11"]);
   693→
   694→    /* test zero length matches */
   695→    a = /(?:(?=(abc)))a/.exec("abc");
   696→    assert(a, ["a", "abc"]);
   697→    a = /(?:(?=(abc)))?a/.exec("abc");
   698→    assert(a, ["a", undefined]);
   699→    a = /(?:(?=(abc))){0,2}a/.exec("abc");
   700→    assert(a, ["a", undefined]);
   701→    a = /(?:|[\w])+([0-9])/.exec("123a23");
   702→    assert(a, ["123a23", "3"]);
   703→    a = /()*?a/.exec(",");
   704→    assert(a, null);
   705→
   706→    /* test \b escape */
   707→    assert(/[\q{a\b}]/.test("a\b"), true);
   708→    assert(/[\b]/.test("\b"), true);
   709→    
   710→    /* test case insensitive matching (test262 hardly tests it) */
   711→    assert("aAbBcC".replace(/[^b]/gui, "X"), "XXbBXX");
   712→    assert("aAbBcC".replace(/[^A-B]/gui, "X"), "aAbBXX");
   713→
   714→    /* case where lastIndex points to the second element of a
   715→       surrogate pair */
   716→    a = /(?:)/gu;
   717→    a.lastIndex = 1;
   718→    a.exec("🐱");
   719→    assert(a.lastIndex, 0);
   720→
   721→    /* test backreferences */
   722→    assert(/(abc)\1/.exec("abcabc"), ["abcabc", "abc"]);
   723→    assert(/(abc)\1/i.exec("aBcaBC"), ["aBcaBC", "aBc"]);
   724→
   725→    /* large parse stack */
   726→    n = 10000;
   727→    a = new RegExp(repeat("(?:", n) + "a+" + repeat(")", n));
   728→    assert(a.exec("aa"), ["aa"]);
   729→    
   730→    /* additional functions */
   731→    
   732→    a = "abbbc".match(/b+/);
   733→    assert(a, [ "bbb" ]);
   734→    assert("abcaaad".match(/a+/g), [ "a", "aaa" ]);
   735→

<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>

✓ /(b+)c/.exec("abbbbbc")                            = ['bbbbbc', 'bbbbb']
✓ /\x61/.exec("a")[0]                                = 'a'
✓ /\u0061/.exec("a")[0]                              = 'a'
✓ /\ca/.exec("\x01")[0]                              = '\x01'
✓ /\\a/.exec("\\a")[0]                               = '\\a'
✓ /\c0/.exec("\\c0")[0]                              = '\\c0'
✗ /(\.(?\=com|org)|\/)/. exec("ah.com")             : Invalid group syntax: (?\

✗ a = /(\.(?\=com|org)|\/)/.exec("ah.com"); a.index === 2 && a: Invalid group syntax: (?\
✗ /(\.(?\!com|org)|\/)/.exec("ah.com")                        : Invalid group syntax: (?\
✓ /(?=(a+))/.exec("baaabac")                                   = ['', None, None]

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

tests/test_builtin.js:656:function test_regexp()
/home/user/mquickjs-python/tests/test_builtin.js-657-{
/home/user/mquickjs-python/tests/test_builtin.js-658-    var a, str, n;
/home/user/mquickjs-python/tests/test_builtin.js-659-
/home/user/mquickjs-python/tests/test_builtin.js-660-    str = "abbbbbc";
/home/user/mquickjs-python/tests/test_builtin.js-661-    a = /(b+)c/.exec(str);
/home/user/mquickjs-python/tests/test_builtin.js-662-    assert(a[0], "bbbbbc");
/home/user/mquickjs-python/tests/test_builtin.js-663-    assert(a[1], "bbbbb");
/home/user/mquickjs-python/tests/test_builtin.js-664-    assert(a.index, 1);
/home/user/mquickjs-python/tests/test_builtin.js-665-    assert(a.input, str);
/home/user/mquickjs-python/tests/test_builtin.js-666-    a = /(b+)c/.test(str);
/home/user/mquickjs-python/tests/test_builtin.js-667-    assert(a, true);
/home/user/mquickjs-python/tests/test_builtin.js-668-    assert(/\x61/.exec("a")[0], "a");
/home/user/mquickjs-python/tests/test_builtin.js-669-    assert(/\u0061/.exec("a")[0], "a");
/home/user/mquickjs-python/tests/test_builtin.js-670-    assert(/\ca/.exec("\x01")[0], "\x01");
/home/user/mquickjs-python/tests/test_builtin.js-671-    assert(/\\a/.exec("\\a")[0], "\\a");
/home/user/mquickjs-python/tests/test_builtin.js-672-    assert(/\c0/.exec("\\c0")[0], "\\c0");
/home/user/mquickjs-python/tests/test_builtin.js-673-
/home/user/mquickjs-python/tests/test_builtin.js-674-    a = /(\.(?=com|org)|\/)/.exec("ah.com");
/home/user/mquickjs-python/tests/test_builtin.js-675-    assert(a.index === 2 && a[0] === ".");
/home/user/mquickjs-python/tests/test_builtin.js-676-
/home/user/mquickjs-python/tests/test_builtin.js-677-    a = /(\.(?!com|org)|\/)/.exec("ah.com");
/home/user/mquickjs-python/tests/test_builtin.js-678-    assert(a, null);
/home/user/mquickjs-python/tests/test_builtin.js-679-
/home/user/mquickjs-python/tests/test_builtin.js-680-    a = /(?=(a+))/.exec("baaabac");
/home/user/mquickjs-python/tests/test_builtin.js-681-    assert(a.index === 1 && a[0] === "" && a[1] === "aaa");
/home/user/mquickjs-python/tests/test_builtin.js-682-
/home/user/mquickjs-python/tests/test_builtin.js-683-    a = /(z)((a+)?(b+)?(c))*/.exec("zaacbbbcac");
/home/user/mquickjs-python/tests/test_builtin.js-684-    assert(a, ["zaacbbbcac","z","ac","a", undefined,"c"]);
/home/user/mquickjs-python/tests/test_builtin.js-685-
/home/user/mquickjs-python/tests/test_builtin.js-686-//    a = (1,eval)("/\0a/");
/home/user/mquickjs-python/tests/test_builtin.js-687-//    assert(a.toString(), "/\0a/");
/home/user/mquickjs-python/tests/test_builtin.js-688-//    assert(a.exec("\0a")[0], "\0a");
/home/user/mquickjs-python/tests/test_builtin.js-689-
/home/user/mquickjs-python/tests/test_builtin.js-690-//    assert(/{1a}/.toString(), "/{1a}/");
/home/user/mquickjs-python/tests/test_builtin.js-691-//    a = /a{1+/.exec("a{11");
/home/user/mquickjs-python/tests/test_builtin.js-692-//    assert(a, ["a{11"]);
/home/user/mquickjs-python/tests/test_builtin.js-693-
/home/user/mquickjs-python/tests/test_builtin.js-694-    /* test zero length matches */
tests/test_builtin.js-695-    a = /(?:(?=(abc)))a/.exec("abc");
/home/user/mquickjs-python/tests/test_builtin.js-696-    assert(a, ["a", "abc"]);
tests/test_builtin.js-697-    a = /(?:(?=(abc)))?a/.exec("abc");
/home/user/mquickjs-python/tests/test_builtin.js-698-    assert(a, ["a", undefined]);
tests/test_builtin.js-699-    a = /(?:(?=(abc))){0,2}a/.exec("abc");
/home/user/mquickjs-python/tests/test_builtin.js-700-    assert(a, ["a", undefined]);
tests/test_builtin.js-701-    a = /(?:|[\w])+([0-9])/.exec("123a23");
/home/user/mquickjs-python/tests/test_builtin.js-702-    assert(a, ["123a23", "3"]);
/home/user/mquickjs-python/tests/test_builtin.js-703-    a = /()*?a/.exec(",");
/home/user/mquickjs-python/tests/test_builtin.js-704-    assert(a, null);
/home/user/mquickjs-python/tests/test_builtin.js-705-
/home/user/mquickjs-python/tests/test_builtin.js-706-    /* test \b escape */
/home/user/mquickjs-python/tests/test_builtin.js-707-    assert(/[\q{a\b}]/.test("a\b"), true);
/home/user/mquickjs-python/tests/test_builtin.js-708-    assert(/[\b]/.test("\b"), true);
/home/user/mquickjs-python/tests/test_builtin.js-709-    
/home/user/mquickjs-python/tests/test_builtin.js-710-    /* test case insensitive matching (test262 hardly tests it) */
/home/user/mquickjs-python/tests/test_builtin.js-711-    assert("aAbBcC".replace(/[^b]/gui, "X"), "XXbBXX");
/home/user/mquickjs-python/tests/test_builtin.js-712-    assert("aAbBcC".replace(/[^A-B]/gui, "X"), "aAbBXX");
/home/user/mquickjs-python/tests/test_builtin.js-713-
/home/user/mquickjs-python/tests/test_builtin.js-714-    /* case where lastIndex points to the second element of a
/home/user/mquickjs-python/tests/test_builtin.js-715-       surrogate pair */
tests/test_builtin.js-716-    a = /(?:)/gu;
/home/user/mquickjs-python/tests/test_builtin.js-717-    a.lastIndex = 1;
/home/user/mquickjs-python/tests/test_builtin.js-718-    a.exec("🐱");
/home/user/mquickjs-python/tests/test_builtin.js-719-    assert(a.lastIndex, 0);
/home/user/mquickjs-python/tests/test_builtin.js-720-
/home/user/mquickjs-python/tests/test_builtin.js-721-    /* test backreferences */
/home/user/mquickjs-python/tests/test_builtin.js-722-    assert(/(abc)\1/.exec("abcabc"), ["abcabc", "abc"]);
/home/user/mquickjs-python/tests/test_builtin.js-723-    assert(/(abc)\1/i.exec("aBcaBC"), ["aBcaBC", "aBc"]);
/home/user/mquickjs-python/tests/test_builtin.js-724-
/home/user/mquickjs-python/tests/test_builtin.js-725-    /* large parse stack */
/home/user/mquickjs-python/tests/test_builtin.js-726-    n = 10000;
tests/test_builtin.js-727-    a = new RegExp(repeat("(?:", n) + "a+" + repeat(")", n));
/home/user/mquickjs-python/tests/test_builtin.js-728-    assert(a.exec("aa"), ["aa"]);
/home/user/mquickjs-python/tests/test_builtin.js-729-    
/home/user/mquickjs-python/tests/test_builtin.js-730-    /* additional functions */
/home/user/mquickjs-python/tests/test_builtin.js-731-    
/home/user/mquickjs-python/tests/test_builtin.js-732-    a = "abbbc".match(/b+/);
/home/user/mquickjs-python/tests/test_builtin.js-733-    assert(a, [ "bbb" ]);
/home/user/mquickjs-python/tests/test_builtin.js-734-    assert("abcaaad".match(/a+/g), [ "a", "aaa" ]);
/home/user/mquickjs-python/tests/test_builtin.js-735-
/home/user/mquickjs-python/tests/test_builtin.js-736-    assert("abc".search(/b/), 1);
/home/user/mquickjs-python/tests/test_builtin.js-737-    assert("abc".search(/d/), -1);
/home/user/mquickjs-python/tests/test_builtin.js-738-
/home/user/mquickjs-python/tests/test_builtin.js-739-    assert("abbbbcbbd".replace(/b+/, "€$&"), "a€bbbbcbbd");
/home/user/mquickjs-python/tests/test_builtin.js-740-    assert("abbbbcbbd".replace(/b+/g, "€$&"), "a€bbbbc€bbd");
/home/user/mquickjs-python/tests/test_builtin.js-741-    assert("abbbbccccd".replace(/(b+)(c+)/g, "_$1_$2_"), "a_bbbb_cccc_d");
/home/user/mquickjs-python/tests/test_builtin.js-742-    assert("abbbbcd".replace(/b+/g, "_$`_$&_$'_"), "a_a_bbbb_cd_cd");
/home/user/mquickjs-python/tests/test_builtin.js-743-
/home/user/mquickjs-python/tests/test_builtin.js-744-    assert("abc".split(/b/), ["a", "c"]);
/home/user/mquickjs-python/tests/test_builtin.js-745-    assert("ab".split(/a*/g), ["", "b"]);
/home/user/mquickjs-python/tests/test_builtin.js-746-    assert("ab".split(/a*?/g), ["a", "b"]);
/home/user/mquickjs-python/tests/test_builtin.js-747-    assert("abc".split(/b/), ["a", "c"]);
/home/user/mquickjs-python/tests/test_builtin.js-748-    assert("A<B>bold</B>and<CODE>coded</CODE>".split(/<(\/)?([^<>]+)>/), ["A", undefined, "B", "bold", "/", "B", "and", undefined, "CODE", "coded", "/", "CODE", ""]);
/home/user/mquickjs-python/tests/test_builtin.js-749-}
/home/user/mquickjs-python/tests/test_builtin.js-750-
/home/user/mquickjs-python/tests/test_builtin.js-751-function eval_error(eval_str, expected_error, level)
/home/user/mquickjs-python/tests/test_builtin.js-752-{
/home/user/mquickjs-python/tests/test_builtin.js-753-    var err = false;
/home/user/mquickjs-python/tests/test_builtin.js-754-    var expected_pos, tab;
/home/user/mquickjs-python/tests/test_builtin.js-755-
/home/user/mquickjs-python/tests/test_builtin.js-756-    tab = get_string_pos(eval_str);

test_regexp failed: Error: assertion failed: got boolean:|false|, expected boolean:|true|

✓ /(b+)c/.exec("abbbbbc") = ['bbbbbc', 'bbbbb']
✓ /a/.exec("a")[0] = a
✓ /a/.exec("a")[0] = a
✓ /\ca/.exec("
")[0] = 

✓ /\a/.exec("\a")[0] = a
✗ /\c0/.exec("\c0")[0]: Error: Cannot read property of null
✓ /(\.(\?=com|org)|\/)/.exec("ah.com") = None

Parsing pattern: '\\c0'
AST: Alternative(terms=[Alternative(terms=[Char(char='\\'), Char(char='c')]), Char(char='0')])
Capture count: 1

17:class RegexCompiler:
456:def compile(ast: Node, capture_count: int, flags: str = "") -> List[Tuple]:

97:    def match(self, string: str, start_pos: int = 0) -> Optional[MatchResult]:

Pattern: '\\c0'
AST: Alternative(terms=[Alternative(terms=[Char(char='\\'), Char(char='c')]), Char(char='0')])
Bytecode: [(<RegexOpCode.SAVE_START: 26>, 0), (<RegexOpCode.CHAR: 1>, 92), (<RegexOpCode.CHAR: 1>, 99), (<RegexOpCode.CHAR: 1>, 48), (<RegexOpCode.SAVE_END: 27>, 0), (<RegexOpCode.MATCH: 39>,)]
Test string: '\\c0'
Result: MatchResult(['\\c0'], index=0)

Testing /\c0/:
Regex object: {'source': '\\c0', 'flags': '', 'global': False, 'ignoreCase': False, 'multiline': False, 'dotAll': False, 'unicode': False, 'sticky': False, 'lastIndex': 0}
Test string: 'c0'
exec result: None
Regex source: '\\c0'

Testing string escaping:
"\\c0".split("") = ['\\', 'c', '0']
"\\c0".length = 3

Testing regex /\c0/:
exec result: ['\\c0']

Failed: Error: Cannot read property of null

Test 8 - control char:
  /\ca/.exec("
") = ['\x01']
  regex source: \ca
  exec(chr(1)) = ['\x01']

Test 9 - escaped backslash:
  Result: ['a']
  String "\a": ['a']

Test 9 - escaped backslash (fixed):
  String "\\a": ['\\', 'a']
  /\\a/.exec("\a"): ['\\a']

============================= 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_builtin_funcs.py::test_builtin_function[test_regexp] XFAIL

============================== 1 xfailed in 0.19s ==============================

test_regexp failed: Error: assertion failed: got boolean:|false|, expected boolean:|true|

Traceback (most recent call last):
  File "<string>", line 57, in <module>
  File "/home/user/mquickjs-python/src/mquickjs_python/context.py", line 1139, in eval
    ast = parser.parse()
          ^^^^^^^^^^^^^^
  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 133, in _parse_statement
    return self._parse_if_statement()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 208, in _parse_if_statement
    test = self._parse_expression()
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 427, in _parse_expression
    expr = self._parse_assignment_expression(exclude_in)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 441, in _parse_assignment_expression
    if self._is_arrow_function_single_param():
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 472, in _is_arrow_function_single_param
    self._advance()  # identifier
    ^^^^^^^^^^^^^^^
  File "/home/user/mquickjs-python/src/mquickjs_python/parser.py", line 54, in _advance
    self.current = self.lexer.next_token()
                   ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/mquickjs-python/src/mquickjs_python/lexer.py", line 388, in next_token
    raise JSSyntaxError(f"Unexpected character: {ch!r}", line, column)
mquickjs_python.errors.JSSyntaxError: SyntaxError: Unexpected character: '\\'

  1. ✓ var a, str, n;
  3. ✓ str = "abbbbbc";
  4. ✓ a = /(b+)c/.exec(str);
  5. ✓ assert(a[0], "bbbbbc");
  6. ✓ assert(a[1], "bbbbb");
  7. ✓ assert(a.index, 1);
  8. ✓ assert(a.input, str);
  9. ✓ a = /(b+)c/.test(str);
 10. ✓ assert(a, true);
 11. ✓ assert(/\x61/.exec("a")[0], "a");
 12. ✓ assert(/\u0061/.exec("a")[0], "a");
 13. ✓ assert(/\ca/.exec("\x01")[0], "\x01");
 14. ✓ assert(/\\a/.exec("\\a")[0], "\\a");
 15. ✓ assert(/\c0/.exec("\\c0")[0], "\\c0");
 17. ✓ a = /(\.(?=com|org)|\/)/.exec("ah.com");
 18. ✓ assert(a.index === 2 && a[0] === ".");
 20. ✓ a = /(\.(?!com|org)|\/)/.exec("ah.com");
 21. ✓ assert(a, null);
 23. ✓ a = /(?=(a+))/.exec("baaabac");
 24. ✗ assert(a.index === 1 && a[0] === "" && a[1] === "aaa");
       Error: Error: assertion failed: got boolean:|false|, expected boolean:|true|

Result of /(?=(a+))/.exec("baaabac"):
  a = ['', None, None]
  a.index = 1
  a[0] = ''
  a[1] = None
  a.length = 3

Expected: index=1, [0]="", [1]="aaa"

src/mquickjs_python/regex/opcodes.py:59:    # Lookahead assertions
src/mquickjs_python/regex/opcodes.py:60:    LOOKAHEAD = auto()      # Positive lookahead (?=...)
src/mquickjs_python/regex/opcodes.py:61:    LOOKAHEAD_NEG = auto()  # Negative lookahead (?!...)
src/mquickjs_python/regex/opcodes.py:62:    LOOKAHEAD_END = auto()  # End of lookahead
src/mquickjs_python/regex/opcodes.py:118:    RegexOpCode.LOOKAHEAD: ("LOOKAHEAD", 1, "Positive lookahead (arg: end_offset)"),
src/mquickjs_python/regex/opcodes.py:119:    RegexOpCode.LOOKAHEAD_NEG: ("LOOKAHEAD_NEG", 1, "Negative lookahead (arg: end_offset)"),
src/mquickjs_python/regex/opcodes.py:120:    RegexOpCode.LOOKAHEAD_END: ("LOOKAHEAD_END", 0, "End of lookahead"),
src/mquickjs_python/regex/parser.py:10:    Assertion   ::= '^' | '$' | '\\b' | '\\B' | Lookahead | Lookbehind
src/mquickjs_python/regex/parser.py:73:class Lookahead:
src/mquickjs_python/regex/parser.py:74:    """Lookahead assertion (?=...) or (?!...)."""
src/mquickjs_python/regex/parser.py:109:             Group, Lookahead, Lookbehind, Quantifier, Alternative, Disjunction]
src/mquickjs_python/regex/parser.py:409:            return Lookahead(body, positive)
src/mquickjs_python/regex/compiler.py:12:    Group, Lookahead, Lookbehind, Quantifier, Alternative, Disjunction,
src/mquickjs_python/regex/compiler.py:86:        elif isinstance(node, Lookahead):
src/mquickjs_python/regex/compiler.py:217:    def _compile_lookahead(self, node: Lookahead):
src/mquickjs_python/regex/compiler.py:220:            split_idx = self._emit(Op.LOOKAHEAD, 0)  # Placeholder for end
src/mquickjs_python/regex/compiler.py:222:            split_idx = self._emit(Op.LOOKAHEAD_NEG, 0)
src/mquickjs_python/regex/compiler.py:225:        self._emit(Op.LOOKAHEAD_END)
src/mquickjs_python/regex/compiler.py:327:        if isinstance(node, (Lookahead, Lookbehind)):
src/mquickjs_python/regex/vm.py:484:            elif opcode == Op.LOOKAHEAD:
src/mquickjs_python/regex/vm.py:494:                    # Lookahead succeeded - restore position and continue after
src/mquickjs_python/regex/vm.py:499:                    # Lookahead failed
src/mquickjs_python/regex/vm.py:504:            elif opcode == Op.LOOKAHEAD_NEG:
src/mquickjs_python/regex/vm.py:522:            elif opcode == Op.LOOKAHEAD_END:
src/mquickjs_python/regex/vm.py:634:            if opcode == Op.LOOKAHEAD_END:
src/mquickjs_python/regex/vm.py:635:                return True  # Lookahead content matched

   480→                    if not stack:
   481→                        return None
   482→                    pc, sp, captures, registers = self._backtrack(stack)
   483→
   484→            elif opcode == Op.LOOKAHEAD:
   485→                end_offset = instr[1]
   486→                # Save current state and try to match lookahead
   487→                saved_sp = sp
   488→                saved_captures = [c.copy() for c in captures]
   489→
   490→                # Create sub-execution for lookahead
   491→                la_result = self._execute_lookahead(string, sp, pc + 1, end_offset)
   492→
   493→                if la_result:
   494→                    # Lookahead succeeded - restore position and continue after
   495→                    sp = saved_sp
   496→                    captures = saved_captures
   497→                    pc = end_offset
   498→                else:
   499→                    # Lookahead failed
   500→                    if not stack:
   501→                        return None
   502→                    pc, sp, captures, registers = self._backtrack(stack)
   503→
   504→            elif opcode == Op.LOOKAHEAD_NEG:
   505→                end_offset = instr[1]
   506→                saved_sp = sp
   507→                saved_captures = [c.copy() for c in captures]
   508→
   509→                la_result = self._execute_lookahead(string, sp, pc + 1, end_offset)
   510→
   511→                if not la_result:
   512→                    # Negative lookahead succeeded (inner didn't match)
   513→                    sp = saved_sp
   514→                    captures = saved_captures
   515→                    pc = end_offset
   516→                else:
   517→                    # Negative lookahead failed (inner matched)
   518→                    if not stack:
   519→                        return None
   520→                    pc, sp, captures, registers = self._backtrack(stack)
   521→
   522→            elif opcode == Op.LOOKAHEAD_END:
   523→                # Successfully matched lookahead content
   524→                return MatchResult([], 0, "")  # Special marker
   525→
   526→            elif opcode == Op.LOOKBEHIND:
   527→                end_offset = instr[1]
   528→                saved_sp = sp
   529→                saved_captures = [c.copy() for c in captures]
   530→
   531→                # Try lookbehind - match pattern ending at current position
   532→                lb_result = self._execute_lookbehind(string, sp, pc + 1, end_offset)
   533→
   534→                if lb_result:
   535→                    # Lookbehind succeeded - restore position and continue after
   536→                    sp = saved_sp
   537→                    captures = saved_captures
   538→                    pc = end_offset
   539→                else:
   540→                    # Lookbehind failed
   541→                    if not stack:
   542→                        return None
   543→                    pc, sp, captures, registers = self._backtrack(stack)
   544→
   545→            elif opcode == Op.LOOKBEHIND_NEG:
   546→                end_offset = instr[1]
   547→                saved_sp = sp
   548→                saved_captures = [c.copy() for c in captures]
   549→
   550→                lb_result = self._execute_lookbehind(string, sp, pc + 1, end_offset)
   551→
   552→                if not lb_result:
   553→                    # Negative lookbehind succeeded (inner didn't match)
   554→                    sp = saved_sp
   555→                    captures = saved_captures
   556→                    pc = end_offset
   557→                else:
   558→                    # Negative lookbehind failed (inner matched)
   559→                    if not stack:

<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>

609:    def _execute_lookahead(self, string: str, start_pos: int, start_pc: int, end_pc: int) -> bool:
610-        """Execute bytecode for lookahead assertion."""
611-        # Simple recursive call with limited bytecode range
612-        pc = start_pc
613-        sp = start_pos
614-        captures = [[-1, -1] for _ in range(self.capture_count)]
615-        registers: List[int] = []
616-        stack: List[Tuple] = []
617-        step_count = 0
618-
619-        while True:
620-            step_count += 1
621-            if step_count % self.poll_interval == 0:
622-                if self.poll_callback and self.poll_callback():
623-                    raise RegexTimeoutError("Regex execution timed out")
624-
625-            if len(stack) > self.stack_limit:
626-                raise RegexStackOverflow("Regex stack overflow")
627-
628-            if pc >= end_pc:
629-                return False
630-
631-            instr = self.bytecode[pc]
632-            opcode = instr[0]
633-
634-            if opcode == Op.LOOKAHEAD_END:
635-                return True  # Lookahead content matched
636-
637-            # Reuse main execution logic for other opcodes
638-            # This is simplified - in production would share more code
639-            if opcode == Op.CHAR:
640-                char_code = instr[1]
641-                if sp >= len(string):
642-                    if not stack:
643-                        return False
644-                    pc, sp, captures, registers = stack.pop()
645-                    continue
646-                ch = string[sp]
647-                if self.ignorecase:
648-                    match = ord(ch.lower()) == char_code or ord(ch.upper()) == char_code
649-                else:
650-                    match = ord(ch) == char_code
651-                if match:
652-                    sp += 1
653-                    pc += 1
654-                else:
655-                    if not stack:
656-                        return False
657-                    pc, sp, captures, registers = stack.pop()
658-
659-            elif opcode == Op.DOT:

   605→        before = pos > 0 and is_word_char(string[pos - 1])
   606→        after = pos < len(string) and is_word_char(string[pos])
   607→        return before != after
   608→
   609→    def _execute_lookahead(self, string: str, start_pos: int, start_pc: int, end_pc: int) -> bool:
   610→        """Execute bytecode for lookahead assertion."""
   611→        # Simple recursive call with limited bytecode range
   612→        pc = start_pc
   613→        sp = start_pos
   614→        captures = [[-1, -1] for _ in range(self.capture_count)]
   615→        registers: List[int] = []
   616→        stack: List[Tuple] = []
   617→        step_count = 0
   618→
   619→        while True:
   620→            step_count += 1
   621→            if step_count % self.poll_interval == 0:
   622→                if self.poll_callback and self.poll_callback():
   623→                    raise RegexTimeoutError("Regex execution timed out")
   624→
   625→            if len(stack) > self.stack_limit:
   626→                raise RegexStackOverflow("Regex stack overflow")
   627→
   628→            if pc >= end_pc:
   629→                return False
   630→
   631→            instr = self.bytecode[pc]
   632→            opcode = instr[0]
   633→
   634→            if opcode == Op.LOOKAHEAD_END:
   635→                return True  # Lookahead content matched
   636→
   637→            # Reuse main execution logic for other opcodes
   638→            # This is simplified - in production would share more code
   639→            if opcode == Op.CHAR:
   640→                char_code = instr[1]
   641→                if sp >= len(string):
   642→                    if not stack:
   643→                        return False
   644→                    pc, sp, captures, registers = stack.pop()
   645→                    continue
   646→                ch = string[sp]
   647→                if self.ignorecase:
   648→                    match = ord(ch.lower()) == char_code or ord(ch.upper()) == char_code
   649→                else:
   650→                    match = ord(ch) == char_code
   651→                if match:
   652→                    sp += 1
   653→                    pc += 1
   654→                else:
   655→                    if not stack:
   656→                        return False
   657→                    pc, sp, captures, registers = stack.pop()
   658→
   659→            elif opcode == Op.DOT:
   660→                if sp >= len(string) or string[sp] == '\n':
   661→                    if not stack:
   662→                        return False
   663→                    pc, sp, captures, registers = stack.pop()
   664→                    continue
   665→                sp += 1
   666→                pc += 1
   667→
   668→            elif opcode == Op.SPLIT_FIRST:
   669→                alt_pc = instr[1]
   670→                stack.append((alt_pc, sp, [c.copy() for c in captures], registers.copy()))
   671→                pc += 1
   672→
   673→            elif opcode == Op.SPLIT_NEXT:
   674→                alt_pc = instr[1]
   675→                stack.append((pc + 1, sp, [c.copy() for c in captures], registers.copy()))
   676→                pc = alt_pc
   677→
   678→            elif opcode == Op.JUMP:
   679→                pc = instr[1]
   680→
   681→            elif opcode == Op.MATCH:
   682→                return True
   683→
   684→            else:
   685→                # Handle other opcodes similarly to main loop
   686→                pc += 1
   687→
   688→    def _execute_lookbehind(self, string: str, end_pos: int, start_pc: int, end_pc: int) -> bool:
   689→        """Execute bytecode for lookbehind assertion.
   690→
   691→        Lookbehind matches if the pattern matches text ending at end_pos.
   692→        We try all possible start positions backwards from end_pos.
   693→        """
   694→        # Try all possible starting positions from 0 to end_pos
   695→        # We want the pattern to match and end exactly at end_pos
   696→        for start_pos in range(end_pos, -1, -1):
   697→            result = self._try_lookbehind_at(string, start_pos, end_pos, start_pc, end_pc)
   698→            if result:
   699→                return True
   700→        return False
   701→
   702→    def _try_lookbehind_at(self, string: str, start_pos: int, end_pos: int,
   703→                           start_pc: int, end_pc: int) -> bool:
   704→        """Try to match lookbehind pattern from start_pos, checking it ends at end_pos."""
   705→        pc = start_pc
   706→        sp = start_pos
   707→        captures = [[-1, -1] for _ in range(self.capture_count)]
   708→        registers: List[int] = []
   709→        stack: List[Tuple] = []
   710→        step_count = 0
   711→
   712→        while True:
   713→            step_count += 1
   714→            if step_count % self.poll_interval == 0:
   715→                if self.poll_callback and self.poll_callback():
   716→                    raise RegexTimeoutError("Regex execution timed out")
   717→
   718→            if len(stack) > self.stack_limit:
   719→                raise RegexStackOverflow("Regex stack overflow")
   720→
   721→            if pc >= end_pc:
   722→                return False
   723→
   724→            instr = self.bytecode[pc]
   725→            opcode = instr[0]
   726→
   727→            if opcode == Op.LOOKBEHIND_END:
   728→                # Check if we ended exactly at the target position
   729→                return sp == end_pos
   730→
   731→            if opcode == Op.CHAR:
   732→                char_code = instr[1]
   733→                if sp >= len(string):
   734→                    if not stack:
   735→                        return False
   736→                    pc, sp, captures, registers = stack.pop()
   737→                    continue
   738→                ch = string[sp]
   739→                if self.ignorecase:
   740→                    match = ord(ch.lower()) == char_code or ord(ch.upper()) == char_code
   741→                else:
   742→                    match = ord(ch) == char_code
   743→                if match:
   744→                    sp += 1
   745→                    pc += 1
   746→                else:
   747→                    if not stack:
   748→                        return False
   749→                    pc, sp, captures, registers = stack.pop()
   750→
   751→            elif opcode == Op.DOT:
   752→                if sp >= len(string) or string[sp] == '\n':
   753→                    if not stack:
   754→                        return 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>

     1→"""
     2→Regex bytecode VM.
     3→
     4→Executes regex bytecode with:
     5→- Explicit backtracking stack
     6→- Timeout integration via polling
     7→- Memory limits (stack size)
     8→- ReDoS protection
     9→"""
    10→
    11→from typing import List, Tuple, Optional, Callable
    12→from .opcodes import RegexOpCode as Op
    13→
    14→
    15→class RegexTimeoutError(Exception):
    16→    """Raised when regex execution times out."""
    17→    pass
    18→
    19→
    20→class RegexStackOverflow(Exception):
    21→    """Raised when regex stack limit is exceeded."""
    22→    pass
    23→
    24→
    25→class MatchResult:
    26→    """Result of a successful regex match."""
    27→
    28→    def __init__(self, groups: List[Optional[str]], index: int, input_str: str):
    29→        self._groups = groups
    30→        self.index = index
    31→        self.input = input_str
    32→
    33→    def __getitem__(self, idx: int) -> Optional[str]:
    34→        if idx < 0 or idx >= len(self._groups):
    35→            return None
    36→        return self._groups[idx]
    37→
    38→    def __len__(self) -> int:
    39→        return len(self._groups)
    40→
    41→    def group(self, idx: int = 0) -> Optional[str]:
    42→        return self[idx]
    43→
    44→    def groups(self) -> Tuple[Optional[str], ...]:
    45→        return tuple(self._groups[1:])  # Exclude group 0
    46→
    47→    def __repr__(self):
    48→        return f"MatchResult({self._groups!r}, index={self.index})"
    49→
    50→

<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 file /home/user/mquickjs-python/src/mquickjs_python/regex/vm.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   605→        before = pos > 0 and is_word_char(string[pos - 1])
   606→        after = pos < len(string) and is_word_char(string[pos])
   607→        return before != after
   608→
   609→    def _execute_lookahead(self, string: str, start_pos: int, start_pc: int, end_pc: int,
   610→                            input_captures: List[List[int]]) -> Optional[List[List[int]]]:
   611→        """Execute bytecode for lookahead assertion.
   612→
   613→        Returns the captures list if lookahead succeeds, None if it fails.
   614→        This preserves captures made inside the lookahead.
   615→        """
   616→        # Start with a copy of input captures to preserve outer captures
   617→        pc = start_pc
   618→        sp = start_pos
   619→        captures = [c.copy() for c in input_captures]
   620→        registers: List[int] = []
   621→        stack: List[Tuple] = []
   622→        step_count = 0
   623→
   624→        while True:
   625→            step_count += 1
   626→            if step_count % self.poll_interval == 0:
   627→                if self.poll_callback and self.poll_callback():
   628→                    raise RegexTimeoutError("Regex execution timed out")
   629→
   630→            if len(stack) > self.stack_limit:
   631→                raise RegexStackOverflow("Regex stack overflow")
   632→
   633→            if pc >= end_pc:
   634→                return None
   635→
   636→            instr = self.bytecode[pc]
   637→            opcode = instr[0]
   638→
   639→            if opcode == Op.LOOKAHEAD_END:
   640→                return captures  # Return captures made inside lookahead
   641→
   642→            # Handle SAVE_START/SAVE_END to capture groups inside lookahead
   643→            if opcode == Op.SAVE_START:
   644→                group_idx = instr[1]
   645→                if group_idx < len(captures):
   646→                    captures[group_idx][0] = sp
   647→                pc += 1
   648→
   649→            elif opcode == Op.SAVE_END:
   650→                group_idx = instr[1]
   651→                if group_idx < len(captures):
   652→                    captures[group_idx][1] = sp
   653→                pc += 1
   654→
   655→            elif opcode == Op.CHAR:
   656→                char_code = instr[1]
   657→                if sp >= len(string):
   658→                    if not stack:
   659→                        return None
   660→                    pc, sp, captures, registers = stack.pop()
   661→                    continue
   662→                ch = string[sp]
   663→                if self.ignorecase:
   664→                    match = ord(ch.lower()) == char_code or ord(ch.upper()) == char_code
   665→                else:
   666→                    match = ord(ch) == char_code
   667→                if match:
   668→                    sp += 1
   669→                    pc += 1
   670→                else:
   671→                    if not stack:
   672→                        return None
   673→                    pc, sp, captures, registers = stack.pop()
   674→
   675→            elif opcode == Op.DOT:
   676→                if sp >= len(string) or string[sp] == '\n':
   677→                    if not stack:
   678→                        return None
   679→                    pc, sp, captures, registers = stack.pop()
   680→                    continue
   681→                sp += 1
   682→                pc += 1
   683→
   684→            elif opcode == Op.SPLIT_FIRST:
   685→                alt_pc = instr[1]
   686→                stack.append((alt_pc, sp, [c.copy() for c in captures], registers.copy()))
   687→                pc += 1
   688→
   689→            elif opcode == Op.SPLIT_NEXT:
   690→                alt_pc = instr[1]
   691→                stack.append((pc + 1, sp, [c.copy() for c in captures], registers.copy()))
   692→                pc = alt_pc
   693→
   694→            elif opcode == Op.JUMP:
   695→                pc = instr[1]
   696→
   697→            elif opcode == Op.MATCH:
   698→                return captures
   699→
   700→            else:
   701→                # Handle other opcodes similarly to main loop
   702→                pc += 1
   703→
   704→    def _execute_lookbehind(self, string: str, end_pos: int, start_pc: int, end_pc: int) -> bool:
   705→        """Execute bytecode for lookbehind assertion.
   706→

   480→                    if not stack:
   481→                        return None
   482→                    pc, sp, captures, registers = self._backtrack(stack)
   483→
   484→            elif opcode == Op.LOOKAHEAD:
   485→                end_offset = instr[1]
   486→                # Save current state and try to match lookahead
   487→                saved_sp = sp
   488→                saved_captures = [c.copy() for c in captures]
   489→
   490→                # Create sub-execution for lookahead
   491→                la_result = self._execute_lookahead(string, sp, pc + 1, end_offset)
   492→
   493→                if la_result:
   494→                    # Lookahead succeeded - restore position and continue after
   495→                    sp = saved_sp
   496→                    captures = saved_captures
   497→                    pc = end_offset
   498→                else:
   499→                    # Lookahead failed
   500→                    if not stack:
   501→                        return None
   502→                    pc, sp, captures, registers = self._backtrack(stack)
   503→
   504→            elif opcode == Op.LOOKAHEAD_NEG:
   505→                end_offset = instr[1]
   506→                saved_sp = sp
   507→                saved_captures = [c.copy() for c in captures]
   508→
   509→                la_result = self._execute_lookahead(string, sp, pc + 1, end_offset)
   510→
   511→                if not la_result:
   512→                    # Negative lookahead succeeded (inner didn't match)
   513→                    sp = saved_sp
   514→                    captures = saved_captures
   515→                    pc = end_offset
   516→                else:
   517→                    # Negative lookahead failed (inner matched)
   518→                    if not stack:
   519→                        return None
   520→                    pc, sp, captures, registers = self._backtrack(stack)
   521→
   522→            elif opcode == Op.LOOKAHEAD_END:
   523→                # Successfully matched lookahead content
   524→                return MatchResult([], 0, "")  # Special marker
   525→
   526→            elif opcode == Op.LOOKBEHIND:
   527→                end_offset = instr[1]
   528→                saved_sp = sp
   529→                saved_captures = [c.copy() for c in captures]

<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 file /home/user/mquickjs-python/src/mquickjs_python/regex/vm.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   480→                    if not stack:
   481→                        return None
   482→                    pc, sp, captures, registers = self._backtrack(stack)
   483→
   484→            elif opcode == Op.LOOKAHEAD:
   485→                end_offset = instr[1]
   486→                # Save current state and try to match lookahead
   487→                saved_sp = sp
   488→                saved_captures = [c.copy() for c in captures]
   489→
   490→                # Create sub-execution for lookahead, passing current captures
   491→                la_captures = self._execute_lookahead(string, sp, pc + 1, end_offset, captures)
   492→
   493→                if la_captures is not None:
   494→                    # Lookahead succeeded - restore position but keep captures from lookahead
   495→                    sp = saved_sp
   496→                    captures = la_captures  # Use captures from lookahead
   497→                    pc = end_offset
   498→                else:
   499→                    # Lookahead failed
   500→                    if not stack:
   501→                        return None
   502→                    pc, sp, captures, registers = self._backtrack(stack)
   503→
   504→            elif opcode == Op.LOOKAHEAD_NEG:
   505→                end_offset = instr[1]
   506→                saved_sp = sp
   507→                saved_captures = [c.copy() for c in captures]
   508→
   509→                la_captures = self._execute_lookahead(string, sp, pc + 1, end_offset, captures)
   510→
   511→                if la_captures is None:
   512→                    # Negative lookahead succeeded (inner didn't match)
   513→                    sp = saved_sp
   514→                    captures = saved_captures  # Keep original captures
   515→                    pc = end_offset
   516→                else:
   517→                    # Negative lookahead failed (inner matched)
   518→                    if not stack:
   519→                        return None
   520→                    pc, sp, captures, registers = self._backtrack(stack)
   521→
   522→            elif opcode == Op.LOOKAHEAD_END:
   523→                # Successfully matched lookahead content
   524→                return MatchResult([], 0, "")  # Special marker

Result of /(?=(a+))/.exec("baaabac"):
  a.index = 1
  a[0] = ''
  a[1] = None
  Expected: index=1, [0]="", [1]="aaa"

Pattern: (?=(a+))
AST: Lookahead(body=Group(body=Quantifier(body=Char(char='a'), min=1, max=-1, greedy=True), capturing=True, group_index=2), positive=True)
Capture count: 3
Bytecode:
  0: (<RegexOpCode.SAVE_START: 26>, 0)
  1: (<RegexOpCode.LOOKAHEAD: 31>, 8)
  2: (<RegexOpCode.SAVE_START: 26>, 2)
  3: (<RegexOpCode.CHAR: 1>, 97)
  4: (<RegexOpCode.SPLIT_FIRST: 19>, 6)
  5: (<RegexOpCode.JUMP: 18>, 3)
  6: (<RegexOpCode.SAVE_END: 27>, 2)
  7: (<RegexOpCode.LOOKAHEAD_END: 33>,)
  8: (<RegexOpCode.SAVE_END: 27>, 0)
  9: (<RegexOpCode.MATCH: 39>,)
Result: None

Pattern: (?=(a+))
AST: Lookahead(body=Group(body=Quantifier(body=Char(char='a'), min=1, max=-1, greedy=True), capturing=True, group_index=2), positive=True)
Capture count: 3
Lookahead body: Group(body=Quantifier(body=Char(char='a'), min=1, max=-1, greedy=True), capturing=True, group_index=2)
  Group index: 2
  Capturing: True

Initial state:
  group_count: 0

Tracing parse:
  Pattern: (?=(a+))
  At pos 0: '('
For just (a+):
  AST: Group(body=Quantifier(body=Char(char='a'), min=1, max=-1, greedy=True), capturing=True, group_index=1)
  count: 2
For (?=(a+)):
  AST: Lookahead(body=Group(body=Quantifier(body=Char(char='a'), min=1, max=-1, greedy=True), capturing=True, group_index=2), positive=True)
  count: 3

   353→    def _parse_group(self) -> Node:
   354→        """Parse group (...), (?:...), (?=...), (?!...), (?<=...), (?<!...)."""
   355→        self._advance()  # consume '('
   356→
   357→        capturing = True
   358→        group_index = 0
   359→        is_lookahead = False
   360→        is_lookbehind = False
   361→        positive = True
   362→
   363→        if self._peek() == '?':
   364→            self._advance()
   365→            next_ch = self._peek()
   366→
   367→            if next_ch == ':':
   368→                # Non-capturing group (?:...)
   369→                self._advance()
   370→                capturing = False
   371→            elif next_ch == '=':
   372→                # Positive lookahead (?=...)
   373→                self._advance()
   374→                is_lookahead = True
   375→                positive = True
   376→            elif next_ch == '!':
   377→                # Negative lookahead (?!...)
   378→                self._advance()
   379→                is_lookahead = True
   380→                positive = False
   381→            elif next_ch == '<':
   382→                self._advance()
   383→                next_ch2 = self._peek()
   384→                if next_ch2 == '=':
   385→                    # Positive lookbehind (?<=...)
   386→                    self._advance()
   387→                    is_lookbehind = True
   388→                    positive = True
   389→                elif next_ch2 == '!':
   390→                    # Negative lookbehind (?<!...)
   391→                    self._advance()
   392→                    is_lookbehind = True
   393→                    positive = False
   394→                else:
   395→                    raise RegExpError("Invalid group syntax")
   396→            else:
   397→                raise RegExpError(f"Invalid group syntax: (?{next_ch}")
   398→
   399→        if capturing:
   400→            self.group_count += 1
   401→            group_index = self.group_count
   402→
   403→        body = self._parse_disjunction()
   404→
   405→        if not self._match(')'):
   406→            raise RegExpError("Unterminated group")
   407→
   408→        if is_lookahead:
   409→            return Lookahead(body, positive)
   410→        if is_lookbehind:
   411→            return Lookbehind(body, positive)
   412→
   413→        return Group(body, capturing, group_index)
   414→
   415→    def _parse_escape(self) -> Node:
   416→        """Parse escape sequence."""
   417→        self._advance()  # consume '\\'

<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 file /home/user/mquickjs-python/src/mquickjs_python/regex/parser.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   363→        if self._peek() == '?':
   364→            self._advance()
   365→            next_ch = self._peek()
   366→
   367→            if next_ch == ':':
   368→                # Non-capturing group (?:...)
   369→                self._advance()
   370→                capturing = False
   371→            elif next_ch == '=':
   372→                # Positive lookahead (?=...)
   373→                self._advance()
   374→                is_lookahead = True
   375→                capturing = False  # Lookahead itself is not a capturing group
   376→                positive = True
   377→            elif next_ch == '!':
   378→                # Negative lookahead (?!...)
   379→                self._advance()
   380→                is_lookahead = True
   381→                capturing = False  # Lookahead itself is not a capturing group
   382→                positive = False
   383→            elif next_ch == '<':
   384→                self._advance()
   385→                next_ch2 = self._peek()
   386→                if next_ch2 == '=':
   387→                    # Positive lookbehind (?<=...)
   388→                    self._advance()
   389→                    is_lookbehind = True
   390→                    capturing = False  # Lookbehind itself is not a capturing group
   391→                    positive = True
   392→                elif next_ch2 == '!':
   393→                    # Negative lookbehind (?<!...)
   394→                    self._advance()
   395→                    is_lookbehind = True
   396→                    capturing = False  # Lookbehind itself is not a capturing group
   397→                    positive = False
   398→                else:
   399→                    raise RegExpError("Invalid group syntax")
   400→            else:
   401→                raise RegExpError(f"Invalid group syntax: (?{next_ch}")
   402→
   403→        if capturing:
   404→            self.group_count += 1
   405→            group_index = self.group_count

Pattern: (?=(a+))
AST: Lookahead(body=Group(body=Quantifier(body=Char(char='a'), min=1, max=-1, greedy=True), capturing=True, group_index=1), positive=True)
Capture count: 2

Result of /(?=(a+))/.exec("baaabac"):
  a.index = 1
  a[0] = ''
  a[1] = 'aaa'
  Expected: index=1, [0]="", [1]="aaa"

test_regexp failed: Error: Cannot convert object to primitive value

 21. ✗ assert(a, null);
       Error: Error: a is not defined

test_regexp starts at line 656

   680→    a = /(?=(a+))/.exec("baaabac");
   681→    assert(a.index === 1 && a[0] === "" && a[1] === "aaa");
   682→
   683→    a = /(z)((a+)?(b+)?(c))*/.exec("zaacbbbcac");
   684→    assert(a, ["zaacbbbcac","z","ac","a", undefined,"c"]);
   685→
   686→//    a = (1,eval)("/\0a/");
   687→//    assert(a.toString(), "/\0a/");
   688→//    assert(a.exec("\0a")[0], "\0a");
   689→
   690→//    assert(/{1a}/.toString(), "/{1a}/");
   691→//    a = /a{1+/.exec("a{11");
   692→//    assert(a, ["a{11"]);
   693→
   694→    /* test zero length matches */
   695→    a = /(?:(?=(abc)))a/.exec("abc");
   696→    assert(a, ["a", "abc"]);
   697→    a = /(?:(?=(abc)))?a/.exec("abc");
   698→    assert(a, ["a", undefined]);
   699→    a = /(?:(?=(abc))){0,2}a/.exec("abc");
   700→    assert(a, ["a", undefined]);
   701→    a = /(?:|[\w])+([0-9])/.exec("123a23");
   702→    assert(a, ["123a23", "3"]);
   703→    a = /()*?a/.exec(",");
   704→    assert(a, null);
   705→
   706→    /* test \b escape */
   707→    assert(/[\q{a\b}]/.test("a\b"), true);
   708→    assert(/[\b]/.test("\b"), true);
   709→    
   710→    /* test case insensitive matching (test262 hardly tests it) */
   711→    assert("aAbBcC".replace(/[^b]/gui, "X"), "XXbBXX");
   712→    assert("aAbBcC".replace(/[^A-B]/gui, "X"), "aAbBXX");
   713→
   714→    /* case where lastIndex points to the second element of a
   715→       surrogate pair */
   716→    a = /(?:)/gu;
   717→    a.lastIndex = 1;
   718→    a.exec("🐱");
   719→    assert(a.lastIndex, 0);
   720→
   721→    /* test backreferences */
   722→    assert(/(abc)\1/.exec("abcabc"), ["abcabc", "abc"]);
   723→    assert(/(abc)\1/i.exec("aBcaBC"), ["aBcaBC", "aBc"]);
   724→
   725→    /* large parse stack */
   726→    n = 10000;
   727→    a = new RegExp(repeat("(?:", n) + "a+" + repeat(")", n));
   728→    assert(a.exec("aa"), ["aa"]);
   729→    

<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>

Testing line 683-684:
  Result: ['zaacbbbcac', 'z', 'ac', 'a', 'bbb', 'c']
  Expected: ["zaacbbbcac","z","ac","a", undefined,"c"]
  [0]: got='zaacbbbcac', expected='zaacbbbcac' ✓
  [1]: got='z', expected='z' ✓
  [2]: got='ac', expected='ac' ✓
  [3]: got='a', expected='a' ✓
  [4]: got='bbb', expected=None ✗
  [5]: got='c', expected='c' ✓

  File "<string>", line 20
    if result \!= expected:
               ^
SyntaxError: unexpected character after line continuation character

✓ /(?:(?=(abc)))a/.exec("abc")
✗ /(?:(?=(abc)))?a/.exec("abc")
    got: ['a', 'abc']
    expected: ['a', None]
✗ /(?:(?=(abc))){0,2}a/.exec("abc")
    got: ['a', 'abc']
    expected: ['a', None]
✗ /(?:|[\w])+([0-9])/.exec("123a23")
    got: ['1', '1']
    expected: ['123a23', '3']
✓ /()*?a/.exec(",")

configfile: pyproject.toml
collecting ... collected 15 items

tests/test_builtin_funcs.py::test_builtin_function[test_function] PASSED [  6%]
tests/test_builtin_funcs.py::test_builtin_function[test] PASSED          [ 13%]
tests/test_builtin_funcs.py::test_builtin_function[test_enum] PASSED     [ 20%]
tests/test_builtin_funcs.py::test_builtin_function[test_array] PASSED    [ 26%]
tests/test_builtin_funcs.py::test_builtin_function[test_array_ext] PASSED [ 33%]
tests/test_builtin_funcs.py::test_builtin_function[test_string] PASSED   [ 40%]
tests/test_builtin_funcs.py::test_builtin_function[test_string2] PASSED  [ 46%]
tests/test_builtin_funcs.py::test_builtin_function[test_math] PASSED     [ 53%]
tests/test_builtin_funcs.py::test_builtin_function[test_number] PASSED   [ 60%]
tests/test_builtin_funcs.py::test_builtin_function[test_global_eval] XFAIL [ 66%]
tests/test_builtin_funcs.py::test_builtin_function[test_typed_array] PASSED [ 73%]
tests/test_builtin_funcs.py::test_builtin_function[test_json] PASSED     [ 80%]
tests/test_builtin_funcs.py::test_builtin_function[test_large_eval_parse_stack] XFAIL [ 86%]
tests/test_builtin_funcs.py::test_builtin_function[test_regexp] XFAIL    [ 93%]
tests/test_builtin_funcs.py::test_builtin_function[test_line_column_numbers] XFAIL [100%]

======================== 11 passed, 4 xfailed in 0.68s =========================

============================= 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 431 items

tests/test_arrow_functions.py .............                              [  3%]
tests/test_basic.py .                                                    [  3%]
tests/test_builtin_funcs.py .........x..xxx                              [  6%]
tests/test_compatibility.py ............................................ [ 16%]
.                                                                        [ 17%]
tests/test_function_methods.py ...........                               [ 19%]
tests/test_js_basic.py .......................xx                         [ 25%]
tests/test_jscontext_regexp.py ..................                        [ 29%]
tests/test_lexer.py .................................................... [ 41%]
..                                                                       [ 42%]
tests/test_parser.py ................................................... [ 54%]
........                                                                 [ 55%]
tests/test_rect.py .....                                                 [ 57%]
tests/test_regex.py .................................................... [ 69%]
.........................F

=================================== FAILURES ===================================
____________________ TestErrorHandling.test_invalid_escape _____________________
tests/test_regex.py:578: in test_invalid_escape
    with pytest.raises(RegExpError):
E   Failed: DID NOT RAISE <class 'mquickjs_python.regex.parser.RegExpError'>
=========================== short test summary info ============================
FAILED tests/test_regex.py::TestErrorHandling::test_invalid_escape - Failed: ...
!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!
================== 1 failed, 317 passed, 6 xfailed in 15.67s ===================

576:    def test_invalid_escape(self):
577-        """Invalid escape sequence."""
578-        with pytest.raises(RegExpError):
579-            RegExp(r"\c")  # Invalid control escape
580-
581-
582-class TestReDoSProtection:
583-    """Test ReDoS (catastrophic backtracking) protection."""
584-
585-    def test_nested_quantifiers_timeout(self):
586-        """Nested quantifiers don't cause exponential blowup."""

Pattern: '\\c'
AST: Alternative(terms=[Char(char='\\'), Char(char='c')])

Created regex /c/: \c
Matches "\c": true
Matches "c": false