Claude Code transcript - page 9/12

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src/mquickjs_python/errors.py:6:class JSError(Exception):
src/mquickjs_python/errors.py:15:class JSSyntaxError(JSError):
src/mquickjs_python/errors.py:24:class JSTypeError(JSError):
src/mquickjs_python/errors.py:31:class JSReferenceError(JSError):
src/mquickjs_python/errors.py:38:class JSRangeError(JSError):
src/mquickjs_python/errors.py:45:class MemoryLimitError(JSError):
src/mquickjs_python/errors.py:52:class TimeLimitError(JSError):
src/mquickjs_python/regex/vm.py:15:class RegexTimeoutError(Exception):
src/mquickjs_python/regex/parser.py:20:class RegExpError(Exception):

     1→"""JavaScript error types and exceptions."""
     2→
     3→from typing import Optional
     4→
     5→
     6→class JSError(Exception):
     7→    """Base class for all JavaScript errors."""
     8→
     9→    def __init__(self, message: str = "", name: str = "Error"):
    10→        self.message = message
    11→        self.name = name
    12→        super().__init__(f"{name}: {message}" if message else name)
    13→
    14→
    15→class JSSyntaxError(JSError):
    16→    """JavaScript syntax error during parsing."""
    17→
    18→    def __init__(self, message: str = "", line: int = 0, column: int = 0):
    19→        super().__init__(message, "SyntaxError")
    20→        self.line = line
    21→        self.column = column
    22→
    23→
    24→class JSTypeError(JSError):
    25→    """JavaScript type error."""
    26→
    27→    def __init__(self, message: str = ""):
    28→        super().__init__(message, "TypeError")
    29→
    30→
    31→class JSReferenceError(JSError):
    32→    """JavaScript reference error (undefined variable)."""
    33→
    34→    def __init__(self, message: str = ""):
    35→        super().__init__(message, "ReferenceError")
    36→
    37→
    38→class JSRangeError(JSError):
    39→    """JavaScript range error."""
    40→
    41→    def __init__(self, message: str = ""):
    42→        super().__init__(message, "RangeError")
    43→
    44→
    45→class MemoryLimitError(JSError):
    46→    """Raised when memory limit is exceeded."""
    47→
    48→    def __init__(self, message: str = "Memory limit exceeded"):
    49→        super().__init__(message, "InternalError")
    50→
    51→
    52→class TimeLimitError(JSError):
    53→    """Raised when execution time limit is exceeded."""
    54→
    55→    def __init__(self, message: str = "Execution timeout"):
    56→        super().__init__(message, "InternalError")
    57→

<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>

/home/user/mquickjs-python/src/mquickjs_python/context.py-48-        self._globals["Object"] = self._create_object_constructor()
/home/user/mquickjs-python/src/mquickjs_python/context.py-49-        self._globals["Array"] = self._create_array_constructor()
src/mquickjs_python/context.py:50:        self._globals["Error"] = self._create_error_constructor("Error")
src/mquickjs_python/context.py:51:        self._globals["TypeError"] = self._create_error_constructor("TypeError")
src/mquickjs_python/context.py:52:        self._globals["SyntaxError"] = self._create_error_constructor("SyntaxError")
src/mquickjs_python/context.py:53:        self._globals["ReferenceError"] = self._create_error_constructor("ReferenceError")
src/mquickjs_python/context.py:54:        self._globals["RangeError"] = self._create_error_constructor("RangeError")
src/mquickjs_python/context.py:55:        self._globals["URIError"] = self._create_error_constructor("URIError")
src/mquickjs_python/context.py:56:        self._globals["EvalError"] = self._create_error_constructor("EvalError")
/home/user/mquickjs-python/src/mquickjs_python/context.py-57-
/home/user/mquickjs-python/src/mquickjs_python/context.py-58-        # Math object
/home/user/mquickjs-python/src/mquickjs_python/context.py-59-        self._globals["Math"] = self._create_math_object()
/home/user/mquickjs-python/src/mquickjs_python/context.py-60-
/home/user/mquickjs-python/src/mquickjs_python/context.py-61-        # JSON object
/home/user/mquickjs-python/src/mquickjs_python/context.py-62-        self._globals["JSON"] = self._create_json_object()
/home/user/mquickjs-python/src/mquickjs_python/context.py-63-
/home/user/mquickjs-python/src/mquickjs_python/context.py-64-        # Number constructor and methods
/home/user/mquickjs-python/src/mquickjs_python/context.py-65-        self._globals["Number"] = self._create_number_constructor()
/home/user/mquickjs-python/src/mquickjs_python/context.py-66-
--
/home/user/mquickjs-python/src/mquickjs_python/context.py-414-        return arr_constructor
/home/user/mquickjs-python/src/mquickjs_python/context.py-415-
src/mquickjs_python/context.py:416:    def _create_error_constructor(self, error_name: str) -> JSCallableObject:
/home/user/mquickjs-python/src/mquickjs_python/context.py-417-        """Create an Error constructor (Error, TypeError, SyntaxError, etc.)."""
/home/user/mquickjs-python/src/mquickjs_python/context.py-418-        # Add prototype first so it can be captured in closure
/home/user/mquickjs-python/src/mquickjs_python/context.py-419-        error_prototype = JSObject()
/home/user/mquickjs-python/src/mquickjs_python/context.py-420-        error_prototype.set("name", error_name)
/home/user/mquickjs-python/src/mquickjs_python/context.py-421-        error_prototype.set("message", "")
/home/user/mquickjs-python/src/mquickjs_python/context.py-422-
src/mquickjs_python/context.py:423:        def error_constructor(*args):
/home/user/mquickjs-python/src/mquickjs_python/context.py-424-            message = args[0] if args else UNDEFINED
/home/user/mquickjs-python/src/mquickjs_python/context.py-425-            err = JSObject(error_prototype)  # Set prototype
/home/user/mquickjs-python/src/mquickjs_python/context.py-426-            err.set("message", to_string(message) if message is not UNDEFINED else "")
/home/user/mquickjs-python/src/mquickjs_python/context.py-427-            err.set("name", error_name)
/home/user/mquickjs-python/src/mquickjs_python/context.py-428-            err.set("stack", "")  # Stack trace placeholder
/home/user/mquickjs-python/src/mquickjs_python/context.py-429-            return err
/home/user/mquickjs-python/src/mquickjs_python/context.py-430-
/home/user/mquickjs-python/src/mquickjs_python/context.py-431-        constructor = JSCallableObject(error_constructor)
/home/user/mquickjs-python/src/mquickjs_python/context.py-432-        constructor._name = error_name
/home/user/mquickjs-python/src/mquickjs_python/context.py-433-

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:
196-        """Execute a single opcode."""
197-
--
616-        elif op == OpCode.THROW:
617-            exc = self.stack.pop()
618:            self._throw(exc)
619-
620-        elif op == OpCode.TRY_START:
621-            # arg is the catch handler offset
622-            self.exception_handlers.append((len(self.call_stack) - 1, arg))
623-
624-        elif op == OpCode.TRY_END:
625-            if self.exception_handlers:
626-                self.exception_handlers.pop()
627-
628-        elif op == OpCode.CATCH:
--
2207-            raise JSTypeError(f"{constructor} is not a constructor")
2208-
2209:    def _throw(self, exc: JSValue) -> None:
2210-        """Throw an exception."""
2211-        if self.exception_handlers:
2212-            frame_idx, catch_ip = self.exception_handlers.pop()
2213-
2214-            # Unwind call stack
2215-            while len(self.call_stack) > frame_idx + 1:
2216-                self.call_stack.pop()
2217-
2218-            # Jump to catch handler
2219-            frame = self.call_stack[-1]
--
2232-                raise JSError(to_string(exc))
2233-
2234:    def _handle_python_exception(self, error_type: str, message: str) -> None:
2235-        """Convert a Python exception to a JavaScript exception and throw it."""
2236-        # Get the error constructor from globals
2237-        error_constructor = self.globals.get(error_type)
2238-        if error_constructor and hasattr(error_constructor, '_call_fn'):
2239-            # Create the error object using the constructor
2240-            # Strip the "TypeError: " prefix from the message if present
2241-            if message.startswith(f"{error_type}: "):
2242-                message = message[len(error_type) + 2:]
2243-            error_obj = error_constructor._call_fn(message)
2244:            self._throw(error_obj)
2245-        else:
2246-            # Fall back to a plain object with message property
2247-            error_obj = JSObject()
2248-            error_obj.set("name", error_type)
2249-            error_obj.set("message", message)
2250:            self._throw(error_obj)

95-
96-    def _emit(self, opcode: OpCode, arg: Optional[int] = None) -> int:
97:        """Emit an opcode, return its position."""
98-        pos = len(self.bytecode)
99-        self.bytecode.append(opcode)
100-        if arg is not None:
101-            if opcode in self._JUMP_OPCODES:
102-                # 16-bit little-endian for jump targets
--
108-
109-    def _emit_jump(self, opcode: OpCode) -> int:
110:        """Emit a jump instruction, return position for patching.
111-
112-        Uses 16-bit (2 byte) little-endian offset.
113-        """
114-        pos = len(self.bytecode)
115-        self.bytecode.append(opcode)
--
119-
120-    def _patch_jump(self, pos: int, target: Optional[int] = None) -> None:
121:        """Patch a jump instruction to jump to target (or current position).
122-
123-        Uses 16-bit (2 byte) little-endian offset.
124-        """
125-        if target is None:
126-            target = len(self.bytecode)
--
632-        elif isinstance(node, TryStatement):
633-            # Push TryContext if there's a finally block so break/continue/return
634:            # can inline the finally code
635-            if node.finalizer:
636-                self.try_stack.append(TryContext(finalizer=node.finalizer))
637-
638-            # Try block
639-            try_start = self._emit_jump(OpCode.TRY_START)
--
694-
695-            # Case bodies
696:            case_positions = []
697-            loop_ctx = LoopContext(is_loop=False)  # For break statements only
698-            self.loop_stack.append(loop_ctx)
699-
700-            for i, case in enumerate(node.cases):
701:                case_positions.append(len(self.bytecode))
702-                for stmt in case.consequent:
703-                    self._compile_statement(stmt)
704-
705-            self._patch_jump(jump_end)
706-            self._emit(OpCode.POP)  # Pop discriminant
--
708-            # Patch jumps to case bodies
709-            for pos, idx in jump_to_body:
710:                self._patch_jump(pos, case_positions[idx])
711-            if default_jump:
712-                pos, idx = default_jump
713:                self._patch_jump(pos, case_positions[idx])
714-
715-            # Patch break jumps
716-            for pos in loop_ctx.break_jumps:
717-                self._patch_jump(pos)
718-

total 927
drwxr-xr-x 4 root root   4096 Dec 23 22:39 .
drwxrwxrwt 1 root root  36864 Dec 24 15:38 ..
drwxr-xr-x 8 root root   4096 Dec 23 22:39 .git
-rw-r--r-- 1 root root     33 Dec 23 22:39 Changelog
-rw-r--r-- 1 root root   1137 Dec 23 22:39 LICENSE
-rw-r--r-- 1 root root   3219 Dec 23 22:39 Makefile
-rw-r--r-- 1 root root  11675 Dec 23 22:39 README.md
-rw-r--r-- 1 root root   4738 Dec 23 22:39 cutils.c
-rw-r--r-- 1 root root   7964 Dec 23 22:39 cutils.h
-rw-r--r-- 1 root root  44880 Dec 23 22:39 dtoa.c
-rw-r--r-- 1 root root   3311 Dec 23 22:39 dtoa.h
-rw-r--r-- 1 root root   8400 Dec 23 22:39 example.c
-rw-r--r-- 1 root root   1160 Dec 23 22:39 example_stdlib.c
-rw-r--r-- 1 root root  65804 Dec 23 22:39 libm.c
-rw-r--r-- 1 root root   1802 Dec 23 22:39 libm.h
-rw-r--r-- 1 root root   3091 Dec 23 22:39 list.h
-rw-r--r-- 1 root root  22083 Dec 23 22:39 mqjs.c
-rw-r--r-- 1 root root  17114 Dec 23 22:39 mqjs_stdlib.c
-rw-r--r-- 1 root root 562943 Dec 23 22:39 mquickjs.c
-rw-r--r-- 1 root root  14469 Dec 23 22:39 mquickjs.h
-rw-r--r-- 1 root root  27638 Dec 23 22:39 mquickjs_build.c
-rw-r--r-- 1 root root   4265 Dec 23 22:39 mquickjs_build.h
-rw-r--r-- 1 root root  10183 Dec 23 22:39 mquickjs_opcode.h
-rw-r--r-- 1 root root  12200 Dec 23 22:39 mquickjs_priv.h
-rw-r--r-- 1 root root  21598 Dec 23 22:39 readline.c
-rw-r--r-- 1 root root   3724 Dec 23 22:39 readline.h
-rw-r--r-- 1 root root   6275 Dec 23 22:39 readline_tty.c
-rw-r--r-- 1 root root   1346 Dec 23 22:39 readline_tty.h
-rw-r--r-- 1 root root  25100 Dec 23 22:39 softfp_template.h
-rw-r--r-- 1 root root   5785 Dec 23 22:39 softfp_template_icvt.h
drwxr-xr-x 2 root root   4096 Dec 23 22:39 tests

46:    - fix stack_bottom logic
60:#define JS_STACK_SLACK  16   /* additional free space on the stack */
61:/* min free size in bytes between heap_free and the bottom of the stack */
212:    uint8_t *stack_top;
213:    JSValue *stack_bottom; /* sp must always be higher than stack_bottom */
214:    JSValue *sp; /* current stack pointer */
215:    JSValue *fp; /* current frame pointer, stack_top if none */
217:                               bottom of the stack */
224:    struct JSParseState *parse_state; /* != NULL during JS_Eval() */
227:    JSGCRef *top_gc_ref; /* used to reference temporary GC roots (stack top) */
296:    JSValue stack; /* string or JS_NULL */
350:    /* during parse: variable index + 1 of hoisted function, 0 otherwise */
355:    JSValue byte_code; /* JS_NULL if the function is not parsed yet */
359:    uint16_t stack_size; /* maximum stack size */
405:    /* the opcodes remove n_pop items from the top of the stack, then
498:static int check_free_mem(JSContext *ctx, JSValue *stack_bottom, uint32_t size)
501:    assert(ctx->sp >= stack_bottom);
507:    if (((uint8_t *)stack_bottom - ctx->heap_free) < size + ctx->min_free_size) {
509:        if (((uint8_t *)stack_bottom - ctx->heap_free) < size + ctx->min_free_size) {
517:/* check that 'len' values can be pushed on the stack. Return 0 if OK,
521:    JSValue *new_stack_bottom;
524:    new_stack_bottom = ctx->sp - len;
525:    if (check_free_mem(ctx, new_stack_bottom, len * sizeof(JSValue)))
527:    ctx->stack_bottom = new_stack_bottom;
539:    if (check_free_mem(ctx, ctx->stack_bottom, size))
925:    p->u.error.stack = JS_NULL;
2144:        if (p->u.error.stack != JS_NULL) {
2145:            str = JS_ToCString(ctx, p->u.error.stack, &str_buf);
2509:   true. The function is put on the stack
2628:                    /* It is assumed 'this_obj' is on the stack and
2629:                       that the stack has some slack to add one element. */
3099:   true. The function is put on the stack
3301:                    /* It is assumed "this_obj" already is on the stack
3302:                       and that the stack has some slack to add one
3553:    ctx->stack_top = mem_start + mem_size;
3554:    ctx->sp = (JSValue *)ctx->stack_top;
3555:    ctx->stack_bottom = ctx->sp;
3726:/* stack layout:
3737:   temp stack          (pointed by sp)
3971:    JSValue *fp, stack_str;
3987:    while (fp != (JSValue *)ctx->stack_top && level < 10) {
4024:    stack_str = JS_NewString(ctx, buf);
4027:    p1->u.error.stack = stack_str;
5068:    assert((ctx->sp - 1) >= ctx->stack_bottom);
5094:        return JS_ThrowInternalError(ctx, "C stack overflow");
5452:                            /* move the new arguments at the correct stack position */
5489:                                           b->stack_size);
5528:                JSValue *stack_top, val2;
5552:                stack_top = fp + FRAME_OFFSET_VAR0 + 1;
5555:                    stack_top -= (vars->size - b->arg_count);
5558:                    sp = stack_top;
5560:                    while (sp < stack_top) {
5614:                /* XXX: restore stack_bottom to reduce memory usage */
6655:    JSDTOATempMem tmp_mem; /* XXX: potentially large stack size */
7025:    js_printf(ctx, "heap size=%u/%u stack_size=%u\n",
7027:           (unsigned int)(ctx->stack_top - ctx->heap_base),
7028:           (unsigned int)(ctx->stack_top - (uint8_t *)ctx->sp));
7076:/* JS parser */
7083:    /* warning: order matters (see js_parse_assign_expr) */
7162:/* this structure is pushed on the JS stack, so all members must be JSValue */
7164:    JSValue prev; /* JS_NULL or stack index */
7169:    JSValue drop_count; /* (int) number of stack elements to drop */
7246:static int js_parse_json_value(JSParseState *s, int state, int dummy_param);
7247:static JSValue js_parse_regexp(JSParseState *s, int eval_flags);
7248:static size_t js_parse_regexp_flags(int *pre_flags, const uint8_t *buf);
7249:static int re_parse_alternative(JSParseState *s, int state, int dummy_param);
7250:static int re_parse_disjunction(JSParseState *s, int state, int dummy_param);
7320:    js_printf(ctx, "  stack_size: %d\n", b->stack_size);
7537:static void __attribute__((format(printf, 2, 3), noreturn)) js_parse_error(JSParseState *s, const char *fmt, ...)
7546:static void js_parse_error_mem(JSParseState *s)
7548:    return js_parse_error(s, "not enough memory");
7551:static void js_parse_error_stack_overflow(JSParseState *s)
7553:    return js_parse_error(s, "stack overflow");
7556:static void js_parse_expect1(JSParseState *s, int ch)
7559:        js_parse_error(s, "expecting '%c'", ch);
7562:static void js_parse_expect(JSParseState *s, int ch)
7564:    js_parse_expect1(s, ch);
7568:static void js_parse_expect_semi(JSParseState *s)
7575:        js_parse_error(s, "expecting '%c'", ';');
7606:                js_parse_error(s, "too many nested blocks");
7615:                js_parse_error(s, "expecting '%c'", c);
7618:            js_parse_error(s, "expecting '%c'", state[level - 1]);
7646:            js_parse_error(s, "expecting '%c'", ')');
7693:static void js_parse_get_pos(JSParseState *s, JSParsePos *sp)
7700:static void js_parse_seek_token(JSParseState *s, const JSParsePos *sp)
7711:static int js_parse_skip_parens_token(JSParseState *s)
7716:    js_parse_get_pos(s, &pos);
7718:    js_parse_seek_token(s, &pos);
7723:static int js_parse_escape(const uint8_t *buf, size_t *plen)
7806:static JSValue js_parse_string(JSParseState *s, uint32_t *ppos, int sep)
7816:        js_parse_error_mem(s);
7833:            c = js_parse_escape(buf + pos, &escape_len);
7835:                js_parse_error(s, "invalid escape sequence");
7847:                js_parse_error(s, "invalid UTF-8 sequence");
7851:            js_parse_error_mem(s);
7857:    js_parse_error(s, "unexpected end of string");
7860:static void js_parse_ident(JSParseState *s, JSToken *token,
7871:        js_parse_error_mem(s);
7881:            js_parse_error_mem(s);
7891:        js_parse_error_mem(s);

/home/user/mquickjs-python/src/mquickjs_python/parser.py
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py

     1→"""JavaScript parser - produces an AST from tokens."""
     2→
     3→from typing import List, Optional, Callable
     4→from .lexer import Lexer
     5→from .tokens import Token, TokenType
     6→from .errors import JSSyntaxError
     7→from .ast_nodes import (
     8→    Node, Program, NumericLiteral, StringLiteral, BooleanLiteral, NullLiteral,
     9→    RegexLiteral, Identifier, ThisExpression, ArrayExpression, ObjectExpression, Property,
    10→    UnaryExpression, UpdateExpression, BinaryExpression, LogicalExpression,
    11→    ConditionalExpression, AssignmentExpression, SequenceExpression,
    12→    MemberExpression, CallExpression, NewExpression,
    13→    ExpressionStatement, BlockStatement, EmptyStatement,
    14→    VariableDeclaration, VariableDeclarator,
    15→    IfStatement, WhileStatement, DoWhileStatement, ForStatement,
    16→    ForInStatement, ForOfStatement, BreakStatement, ContinueStatement,
    17→    ReturnStatement, ThrowStatement, TryStatement, CatchClause,
    18→    SwitchStatement, SwitchCase, LabeledStatement,
    19→    FunctionDeclaration, FunctionExpression, ArrowFunctionExpression,
    20→)
    21→
    22→
    23→# Operator precedence (higher = binds tighter)
    24→PRECEDENCE = {
    25→    "||": 1,
    26→    "&&": 2,
    27→    "|": 3,
    28→    "^": 4,
    29→    "&": 5,
    30→    "==": 6, "!=": 6, "===": 6, "!==": 6,
    31→    "<": 7, ">": 7, "<=": 7, ">=": 7, "in": 7, "instanceof": 7,
    32→    "<<": 8, ">>": 8, ">>>": 8,
    33→    "+": 9, "-": 9,
    34→    "*": 10, "/": 10, "%": 10,
    35→    "**": 11,
    36→}
    37→
    38→
    39→class Parser:
    40→    """Recursive descent parser for JavaScript."""
    41→
    42→    def __init__(self, source: str):
    43→        self.lexer = Lexer(source)
    44→        self.current: Token = self.lexer.next_token()
    45→        self.previous: Optional[Token] = None
    46→
    47→    def _error(self, message: str) -> JSSyntaxError:
    48→        """Create a syntax error at current position."""
    49→        return JSSyntaxError(message, self.current.line, self.current.column)
    50→
    51→    def _advance(self) -> Token:
    52→        """Advance to next token and return previous."""
    53→        self.previous = self.current
    54→        self.current = self.lexer.next_token()
    55→        return self.previous
    56→
    57→    def _check(self, *types: TokenType) -> bool:
    58→        """Check if current token is one of the given types."""
    59→        return self.current.type in types
    60→
    61→    def _match(self, *types: TokenType) -> bool:
    62→        """If current token matches, advance and return True."""
    63→        if self._check(*types):
    64→            self._advance()
    65→            return True
    66→        return False
    67→
    68→    def _expect(self, token_type: TokenType, message: str) -> Token:
    69→        """Expect a specific token type or raise error."""
    70→        if self.current.type != token_type:
    71→            raise self._error(message)
    72→        return self._advance()
    73→
    74→    def _is_at_end(self) -> bool:
    75→        """Check if we've reached the end of input."""
    76→        return self.current.type == TokenType.EOF
    77→
    78→    def _is_keyword(self) -> bool:
    79→        """Check if current token is a keyword (reserved word)."""
    80→        # Keywords that can be used as property names in object literals
    81→        keyword_types = {
    82→            TokenType.IF, TokenType.ELSE, TokenType.FOR, TokenType.WHILE,
    83→            TokenType.DO, TokenType.SWITCH, TokenType.CASE, TokenType.DEFAULT,
    84→            TokenType.BREAK, TokenType.CONTINUE, TokenType.RETURN, TokenType.THROW,
    85→            TokenType.TRY, TokenType.CATCH, TokenType.FINALLY, TokenType.FUNCTION,
    86→            TokenType.VAR, TokenType.NEW, TokenType.DELETE, TokenType.TYPEOF,
    87→            TokenType.IN, TokenType.OF, TokenType.INSTANCEOF, TokenType.THIS,
    88→            TokenType.TRUE, TokenType.FALSE, TokenType.NULL, TokenType.VOID,
    89→        }
    90→        return self.current.type in keyword_types
    91→
    92→    def _peek_next(self) -> Token:
    93→        """Peek at the next token without consuming it."""
    94→        # Save current state
    95→        saved_pos = self.lexer.pos
    96→        saved_line = self.lexer.line
    97→        saved_column = self.lexer.column
    98→        saved_current = self.current
    99→
   100→        # Get next token

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>

     1→"""AST node types for JavaScript parser."""
     2→
     3→from dataclasses import dataclass, field
     4→from typing import Any, List, Optional, Union
     5→
     6→
     7→@dataclass
     8→class Node:
     9→    """Base class for all AST nodes."""
    10→
    11→    def to_dict(self) -> dict:
    12→        """Convert node to dictionary for testing/serialization."""
    13→        result = {"type": self.__class__.__name__}
    14→        for key, value in self.__dict__.items():
    15→            if isinstance(value, Node):
    16→                result[key] = value.to_dict()
    17→            elif isinstance(value, list):
    18→                result[key] = [
    19→                    v.to_dict() if isinstance(v, Node) else v
    20→                    for v in value
    21→                ]
    22→            else:
    23→                result[key] = value
    24→        return result
    25→
    26→
    27→# Literals
    28→@dataclass
    29→class NumericLiteral(Node):
    30→    """Numeric literal: 42, 3.14, etc."""
    31→    value: Union[int, float]
    32→
    33→
    34→@dataclass
    35→class StringLiteral(Node):
    36→    """String literal: "hello", 'world'"""
    37→    value: str
    38→
    39→
    40→@dataclass
    41→class BooleanLiteral(Node):
    42→    """Boolean literal: true, false"""
    43→    value: bool
    44→
    45→
    46→@dataclass
    47→class NullLiteral(Node):
    48→    """Null literal: null"""
    49→    pass
    50→
    51→
    52→@dataclass
    53→class RegexLiteral(Node):
    54→    """Regex literal: /pattern/flags"""
    55→    pattern: str
    56→    flags: str
    57→
    58→
    59→@dataclass
    60→class Identifier(Node):
    61→    """Identifier: variable names, property names"""
    62→    name: str
    63→
    64→
    65→@dataclass
    66→class ThisExpression(Node):
    67→    """The 'this' keyword."""
    68→    pass
    69→
    70→
    71→# Expressions
    72→@dataclass
    73→class ArrayExpression(Node):
    74→    """Array literal: [1, 2, 3]"""
    75→    elements: List[Node]
    76→
    77→
    78→@dataclass
    79→class ObjectExpression(Node):
    80→    """Object literal: {a: 1, b: 2}"""

<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>

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

   416→    def _create_error_constructor(self, error_name: str) -> JSCallableObject:
   417→        """Create an Error constructor (Error, TypeError, SyntaxError, etc.)."""
   418→        # Add prototype first so it can be captured in closure
   419→        error_prototype = JSObject()
   420→        error_prototype.set("name", error_name)
   421→        error_prototype.set("message", "")
   422→
   423→        def error_constructor(*args):
   424→            message = args[0] if args else UNDEFINED
   425→            err = JSObject(error_prototype)  # Set prototype
   426→            err.set("message", to_string(message) if message is not UNDEFINED else "")
   427→            err.set("name", error_name)
   428→            err.set("stack", "")  # Stack trace placeholder
   429→            return err
   430→
   431→        constructor = JSCallableObject(error_constructor)
   432→        constructor._name = error_name
   433→
   434→        error_prototype.set("constructor", constructor)
   435→        constructor.set("prototype", error_prototype)
   436→
   437→        return constructor
   438→
   439→    def _create_math_object(self) -> JSObject:
   440→        """Create the Math global object."""
   441→        math_obj = JSObject()
   442→
   443→        # Constants
   444→        math_obj.set("PI", math.pi)
   445→        math_obj.set("E", math.e)
   446→        math_obj.set("LN2", math.log(2))
   447→        math_obj.set("LN10", math.log(10))
   448→        math_obj.set("LOG2E", 1 / math.log(2))
   449→        math_obj.set("LOG10E", 1 / math.log(10))
   450→        math_obj.set("SQRT2", math.sqrt(2))
   451→        math_obj.set("SQRT1_2", math.sqrt(0.5))
   452→
   453→        # Basic functions
   454→        def abs_fn(*args):
   455→            x = to_number(args[0]) if args else float('nan')
   456→            return abs(x)
   457→
   458→        def floor_fn(*args):
   459→            x = to_number(args[0]) if args else float('nan')
   460→            return math.floor(x)
   461→
   462→        def ceil_fn(*args):
   463→            x = to_number(args[0]) if args else float('nan')
   464→            return math.ceil(x)
   465→

<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:
   419→        error_prototype = JSObject()
   420→        error_prototype.set("name", error_name)
   421→        error_prototype.set("message", "")
   422→
   423→        def error_constructor(*args):
   424→            message = args[0] if args else UNDEFINED
   425→            err = JSObject(error_prototype)  # Set prototype
   426→            err.set("message", to_string(message) if message is not UNDEFINED else "")
   427→            err.set("name", error_name)
   428→            err.set("stack", "")  # Stack trace placeholder
   429→            err.set("lineNumber", None)  # Will be set when error is thrown
   430→            err.set("columnNumber", None)  # Will be set when error is thrown
   431→            return err
   432→
   433→        constructor = JSCallableObject(error_constructor)
   434→        constructor._name = error_name
   435→

     1→"""Bytecode compiler - compiles AST to bytecode."""
     2→
     3→from typing import List, Dict, Any, Optional, Tuple
     4→from dataclasses import dataclass, field
     5→from .ast_nodes import (
     6→    Node, Program, NumericLiteral, StringLiteral, BooleanLiteral, NullLiteral,
     7→    RegexLiteral, Identifier, ThisExpression, ArrayExpression, ObjectExpression, Property,
     8→    UnaryExpression, UpdateExpression, BinaryExpression, LogicalExpression,
     9→    ConditionalExpression, AssignmentExpression, SequenceExpression,
    10→    MemberExpression, CallExpression, NewExpression,
    11→    ExpressionStatement, BlockStatement, EmptyStatement,
    12→    VariableDeclaration, VariableDeclarator,
    13→    IfStatement, WhileStatement, DoWhileStatement, ForStatement,
    14→    ForInStatement, ForOfStatement, BreakStatement, ContinueStatement,
    15→    ReturnStatement, ThrowStatement, TryStatement, CatchClause,
    16→    SwitchStatement, SwitchCase, LabeledStatement,
    17→    FunctionDeclaration, FunctionExpression, ArrowFunctionExpression,
    18→)
    19→from .opcodes import OpCode
    20→from .values import UNDEFINED
    21→
    22→
    23→@dataclass
    24→class CompiledFunction:
    25→    """A compiled function."""
    26→    name: str
    27→    params: List[str]
    28→    bytecode: bytes
    29→    constants: List[Any]
    30→    locals: List[str]
    31→    num_locals: int
    32→    free_vars: List[str] = field(default_factory=list)  # Variables captured from outer scope
    33→    cell_vars: List[str] = field(default_factory=list)  # Local variables that are captured by inner functions
    34→
    35→
    36→@dataclass
    37→class LoopContext:
    38→    """Context for loops (for break/continue)."""
    39→    break_jumps: List[int] = field(default_factory=list)
    40→    continue_jumps: List[int] = field(default_factory=list)
    41→    label: Optional[str] = None
    42→    is_loop: bool = True  # False for switch statements (break only, no continue)
    43→
    44→
    45→@dataclass
    46→class TryContext:
    47→    """Context for try-finally blocks (for break/continue/return)."""
    48→    finalizer: Any = None  # The finally block AST node
    49→
    50→
    51→class Compiler:
    52→    """Compiles AST to bytecode."""
    53→
    54→    def __init__(self):
    55→        self.bytecode: List[int] = []
    56→        self.constants: List[Any] = []
    57→        self.names: List[str] = []
    58→        self.locals: List[str] = []
    59→        self.loop_stack: List[LoopContext] = []
    60→        self.try_stack: List[TryContext] = []  # Track try-finally for break/continue/return
    61→        self.functions: List[CompiledFunction] = []
    62→        self._in_function: bool = False  # Track if we're compiling inside a function
    63→        self._outer_locals: List[List[str]] = []  # Stack of outer scope locals
    64→        self._free_vars: List[str] = []  # Free variables captured from outer scopes
    65→        self._cell_vars: List[str] = []  # Local variables captured by inner functions
    66→
    67→    def compile(self, node: Program) -> CompiledFunction:
    68→        """Compile a program to bytecode."""
    69→        body = node.body
    70→
    71→        # Compile all statements except the last one
    72→        for stmt in body[:-1] if body else []:
    73→            self._compile_statement(stmt)
    74→
    75→        # For the last statement, compile with completion value semantics
    76→        if body:
    77→            self._compile_statement_for_value(body[-1])
    78→            self._emit(OpCode.RETURN)
    79→        else:
    80→            # Empty program returns undefined
    81→            self._emit(OpCode.LOAD_UNDEFINED)
    82→            self._emit(OpCode.RETURN)
    83→
    84→        return CompiledFunction(
    85→            name="<program>",
    86→            params=[],
    87→            bytecode=bytes(self.bytecode),
    88→            constants=self.constants,
    89→            locals=self.locals,
    90→            num_locals=len(self.locals),
    91→        )
    92→
    93→    # Opcodes that use 16-bit arguments (jumps and jump-like)
    94→    _JUMP_OPCODES = frozenset([OpCode.JUMP, OpCode.JUMP_IF_FALSE, OpCode.JUMP_IF_TRUE, OpCode.TRY_START])
    95→
    96→    def _emit(self, opcode: OpCode, arg: Optional[int] = None) -> int:
    97→        """Emit an opcode, return its position."""
    98→        pos = len(self.bytecode)
    99→        self.bytecode.append(opcode)
   100→        if arg is not None:
   101→            if opcode in self._JUMP_OPCODES:
   102→                # 16-bit little-endian for jump targets
   103→                self.bytecode.append(arg & 0xFF)
   104→                self.bytecode.append((arg >> 8) & 0xFF)
   105→            else:
   106→                self.bytecode.append(arg)
   107→        return pos
   108→
   109→    def _emit_jump(self, opcode: OpCode) -> int:
   110→        """Emit a jump instruction, return position for patching.
   111→
   112→        Uses 16-bit (2 byte) little-endian offset.
   113→        """
   114→        pos = len(self.bytecode)
   115→        self.bytecode.append(opcode)
   116→        self.bytecode.append(0)  # Low byte placeholder
   117→        self.bytecode.append(0)  # High byte placeholder
   118→        return pos
   119→
   120→    def _patch_jump(self, pos: int, target: Optional[int] = None) -> None:
   121→        """Patch a jump instruction to jump to target (or current position).
   122→
   123→        Uses 16-bit (2 byte) little-endian offset.
   124→        """
   125→        if target is None:
   126→            target = len(self.bytecode)
   127→        self.bytecode[pos + 1] = target & 0xFF  # Low byte
   128→        self.bytecode[pos + 2] = (target >> 8) & 0xFF  # High byte
   129→
   130→    def _emit_pending_finally_blocks(self) -> None:
   131→        """Emit all pending finally blocks (for break/continue/return)."""
   132→        # Emit finally blocks in reverse order (innermost first)
   133→        for try_ctx in reversed(self.try_stack):
   134→            if try_ctx.finalizer:
   135→                self._compile_statement(try_ctx.finalizer)
   136→
   137→    def _add_constant(self, value: Any) -> int:
   138→        """Add a constant and return its index."""
   139→        if value in self.constants:
   140→            return self.constants.index(value)
   141→        self.constants.append(value)
   142→        return len(self.constants) - 1
   143→
   144→    def _add_name(self, name: str) -> int:
   145→        """Add a name and return its index (stored in constants)."""
   146→        # Store names in constants so VM can look them up
   147→        return self._add_constant(name)
   148→
   149→    def _add_local(self, name: str) -> int:
   150→        """Add a local variable and return its slot."""

<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→"""AST node types for JavaScript parser."""
     2→
     3→from dataclasses import dataclass, field
     4→from typing import Any, List, Optional, Union
     5→
     6→
     7→@dataclass
     8→class Node:
     9→    """Base class for all AST nodes."""
    10→
    11→    def to_dict(self) -> dict:
    12→        """Convert node to dictionary for testing/serialization."""
    13→        result = {"type": self.__class__.__name__}
    14→        for key, value in self.__dict__.items():
    15→            if isinstance(value, Node):
    16→                result[key] = value.to_dict()
    17→            elif isinstance(value, list):
    18→                result[key] = [
    19→                    v.to_dict() if isinstance(v, Node) else v
    20→                    for v in value
    21→                ]
    22→            else:
    23→                result[key] = value
    24→        return result
    25→
    26→
    27→# Literals
    28→@dataclass
    29→class NumericLiteral(Node):
    30→    """Numeric literal: 42, 3.14, etc."""
    31→    value: Union[int, float]
    32→
    33→
    34→@dataclass
    35→class StringLiteral(Node):
    36→    """String literal: "hello", 'world'"""
    37→    value: str
    38→
    39→
    40→@dataclass
    41→class BooleanLiteral(Node):
    42→    """Boolean literal: true, false"""
    43→    value: bool
    44→
    45→
    46→@dataclass
    47→class NullLiteral(Node):
    48→    """Null literal: null"""
    49→    pass
    50→
    51→
    52→@dataclass
    53→class RegexLiteral(Node):
    54→    """Regex literal: /pattern/flags"""
    55→    pattern: str
    56→    flags: str
    57→
    58→
    59→@dataclass
    60→class Identifier(Node):
    61→    """Identifier: variable names, property names"""
    62→    name: str
    63→
    64→
    65→@dataclass
    66→class ThisExpression(Node):
    67→    """The 'this' keyword."""
    68→    pass
    69→
    70→
    71→# Expressions
    72→@dataclass
    73→class ArrayExpression(Node):
    74→    """Array literal: [1, 2, 3]"""
    75→    elements: List[Node]
    76→
    77→
    78→@dataclass
    79→class ObjectExpression(Node):
    80→    """Object literal: {a: 1, b: 2}"""
    81→    properties: List["Property"]
    82→
    83→
    84→@dataclass
    85→class Property(Node):
    86→    """Object property: key: value"""
    87→    key: Node  # Identifier or Literal
    88→    value: Node
    89→    kind: str = "init"  # "init", "get", or "set"
    90→    computed: bool = False
    91→    shorthand: bool = False
    92→
    93→
    94→@dataclass
    95→class UnaryExpression(Node):
    96→    """Unary expression: -x, !x, typeof x, etc."""
    97→    operator: str
    98→    argument: Node
    99→    prefix: bool = True
   100→
   101→
   102→@dataclass
   103→class UpdateExpression(Node):
   104→    """Update expression: ++x, x++, --x, x--"""
   105→    operator: str  # "++" or "--"
   106→    argument: Node
   107→    prefix: bool
   108→
   109→
   110→@dataclass
   111→class BinaryExpression(Node):
   112→    """Binary expression: a + b, a * b, etc."""
   113→    operator: str
   114→    left: Node
   115→    right: Node
   116→
   117→
   118→@dataclass
   119→class LogicalExpression(Node):
   120→    """Logical expression: a && b, a || b"""
   121→    operator: str  # "&&" or "||"
   122→    left: Node
   123→    right: Node
   124→
   125→
   126→@dataclass
   127→class ConditionalExpression(Node):
   128→    """Conditional (ternary) expression: a ? b : c"""
   129→    test: Node
   130→    consequent: Node
   131→    alternate: Node
   132→
   133→
   134→@dataclass
   135→class AssignmentExpression(Node):
   136→    """Assignment expression: a = b, a += b, etc."""
   137→    operator: str
   138→    left: Node
   139→    right: Node
   140→
   141→
   142→@dataclass
   143→class SequenceExpression(Node):
   144→    """Sequence expression: a, b, c"""
   145→    expressions: List[Node]
   146→
   147→
   148→@dataclass
   149→class MemberExpression(Node):
   150→    """Member expression: a.b, a[b]"""
   151→    object: Node
   152→    property: Node
   153→    computed: bool  # True for a[b], False for a.b
   154→
   155→
   156→@dataclass
   157→class CallExpression(Node):
   158→    """Call expression: f(a, b)"""
   159→    callee: Node
   160→    arguments: List[Node]
   161→
   162→
   163→@dataclass
   164→class NewExpression(Node):
   165→    """New expression: new Foo(a, b)"""
   166→    callee: Node
   167→    arguments: List[Node]
   168→
   169→
   170→# Statements
   171→@dataclass
   172→class Program(Node):
   173→    """Program node - root of AST."""
   174→    body: List[Node]
   175→
   176→
   177→@dataclass
   178→class ExpressionStatement(Node):
   179→    """Expression statement: expression;"""
   180→    expression: Node
   181→
   182→
   183→@dataclass
   184→class BlockStatement(Node):
   185→    """Block statement: { ... }"""
   186→    body: List[Node]
   187→
   188→
   189→@dataclass
   190→class EmptyStatement(Node):
   191→    """Empty statement: ;"""
   192→    pass
   193→
   194→
   195→@dataclass
   196→class VariableDeclaration(Node):
   197→    """Variable declaration: var a = 1, b = 2;"""
   198→    declarations: List["VariableDeclarator"]
   199→    kind: str = "var"
   200→
   201→
   202→@dataclass
   203→class VariableDeclarator(Node):
   204→    """Variable declarator: a = 1"""
   205→    id: Identifier
   206→    init: Optional[Node]
   207→
   208→
   209→@dataclass
   210→class IfStatement(Node):
   211→    """If statement: if (test) consequent else alternate"""
   212→    test: Node
   213→    consequent: Node
   214→    alternate: Optional[Node]
   215→
   216→
   217→@dataclass
   218→class WhileStatement(Node):
   219→    """While statement: while (test) body"""
   220→    test: Node
   221→    body: Node
   222→
   223→
   224→@dataclass
   225→class DoWhileStatement(Node):
   226→    """Do-while statement: do body while (test)"""
   227→    body: Node
   228→    test: Node
   229→
   230→
   231→@dataclass
   232→class ForStatement(Node):
   233→    """For statement: for (init; test; update) body"""
   234→    init: Optional[Node]  # VariableDeclaration or Expression
   235→    test: Optional[Node]
   236→    update: Optional[Node]
   237→    body: Node
   238→
   239→
   240→@dataclass
   241→class ForInStatement(Node):
   242→    """For-in statement: for (left in right) body"""
   243→    left: Node  # VariableDeclaration or Pattern
   244→    right: Node
   245→    body: Node
   246→
   247→
   248→@dataclass
   249→class ForOfStatement(Node):
   250→    """For-of statement: for (left of right) body"""
   251→    left: Node
   252→    right: Node
   253→    body: Node
   254→
   255→
   256→@dataclass
   257→class BreakStatement(Node):
   258→    """Break statement: break; or break label;"""
   259→    label: Optional[Identifier]
   260→
   261→
   262→@dataclass
   263→class ContinueStatement(Node):
   264→    """Continue statement: continue; or continue label;"""
   265→    label: Optional[Identifier]
   266→
   267→
   268→@dataclass
   269→class ReturnStatement(Node):
   270→    """Return statement: return; or return expr;"""
   271→    argument: Optional[Node]
   272→
   273→
   274→@dataclass
   275→class ThrowStatement(Node):
   276→    """Throw statement: throw expr;"""
   277→    argument: Node
   278→
   279→
   280→@dataclass
   281→class TryStatement(Node):
   282→    """Try statement: try { } catch (e) { } finally { }"""
   283→    block: BlockStatement
   284→    handler: Optional["CatchClause"]
   285→    finalizer: Optional[BlockStatement]
   286→
   287→
   288→@dataclass
   289→class CatchClause(Node):
   290→    """Catch clause: catch (param) { body }"""
   291→    param: Identifier
   292→    body: BlockStatement
   293→
   294→
   295→@dataclass
   296→class SwitchStatement(Node):
   297→    """Switch statement: switch (discriminant) { cases }"""
   298→    discriminant: Node
   299→    cases: List["SwitchCase"]
   300→
   301→
   302→@dataclass
   303→class SwitchCase(Node):
   304→    """Switch case: case test: consequent or default: consequent"""
   305→    test: Optional[Node]  # None for default
   306→    consequent: List[Node]
   307→
   308→
   309→@dataclass
   310→class LabeledStatement(Node):
   311→    """Labeled statement: label: statement"""
   312→    label: Identifier
   313→    body: Node
   314→
   315→
   316→@dataclass
   317→class FunctionDeclaration(Node):
   318→    """Function declaration: function name(params) { body }"""
   319→    id: Identifier
   320→    params: List[Identifier]
   321→    body: BlockStatement
   322→
   323→
   324→@dataclass
   325→class FunctionExpression(Node):
   326→    """Function expression: function name(params) { body }"""
   327→    id: Optional[Identifier]
   328→    params: List[Identifier]
   329→    body: BlockStatement
   330→
   331→
   332→@dataclass
   333→class ArrowFunctionExpression(Node):
   334→    """Arrow function: (params) => body or param => body"""
   335→    params: List[Identifier]
   336→    body: Node  # Can be BlockStatement or expression
   337→    expression: bool  # True if body is an expression, False if block
   338→

<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/ast_nodes.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     1→"""AST node types for JavaScript parser."""
     2→
     3→from dataclasses import dataclass, field
     4→from typing import Any, List, Optional, Union
     5→
     6→
     7→@dataclass
     8→class SourceLocation:
     9→    """Source location information for AST nodes."""
    10→    line: int = 0
    11→    column: int = 0
    12→
    13→
    14→@dataclass
    15→class Node:
    16→    """Base class for all AST nodes."""
    17→    # Source location - set by parser
    18→    loc: Optional[SourceLocation] = field(default=None, repr=False, compare=False)
    19→
    20→    def to_dict(self) -> dict:
    21→        """Convert node to dictionary for testing/serialization."""
    22→        result = {"type": self.__class__.__name__}
    23→        for key, value in self.__dict__.items():
    24→            if key == "loc":
    25→                continue  # Skip location in dict representation
    26→            if isinstance(value, Node):
    27→                result[key] = value.to_dict()
    28→            elif isinstance(value, list):
    29→                result[key] = [
    30→                    v.to_dict() if isinstance(v, Node) else v
    31→                    for v in value
    32→                ]
    33→            else:
    34→                result[key] = value
    35→        return result
    36→
    37→
    38→# Literals
    39→@dataclass

src/mquickjs_python/parser.py:7: in <module>
    from .ast_nodes import (
src/mquickjs_python/ast_nodes.py:39: in <module>
    @dataclass
     ^^^^^^^^^
/usr/lib/python3.11/dataclasses.py:1232: in dataclass
    return wrap(cls)
           ^^^^^^^^^
/usr/lib/python3.11/dataclasses.py:1222: in wrap
    return _process_class(cls, init, repr, eq, order, unsafe_hash,
/usr/lib/python3.11/dataclasses.py:1027: in _process_class
    _init_fn(all_init_fields,
/usr/lib/python3.11/dataclasses.py:545: in _init_fn
    raise TypeError(f'non-default argument {f.name!r} '
E   TypeError: non-default argument 'value' follows default argument
=========================== short test summary info ============================
ERROR tests/test_parser.py - TypeError: non-default argument 'value' follows ...
!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!
1 error in 0.31s

The file /home/user/mquickjs-python/src/mquickjs_python/ast_nodes.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     1→"""AST node types for JavaScript parser."""
     2→
     3→from dataclasses import dataclass, field
     4→from typing import Any, List, Optional, Union
     5→
     6→
     7→@dataclass
     8→class SourceLocation:
     9→    """Source location information for AST nodes."""
    10→    line: int = 0
    11→    column: int = 0
    12→
    13→
    14→@dataclass
    15→class Node:
    16→    """Base class for all AST nodes."""
    17→
    18→    def __post_init__(self):
    19→        # Source location - can be set by parser after creation
    20→        # Using __post_init__ avoids dataclass field ordering issues
    21→        if not hasattr(self, '_loc'):
    22→            self._loc: Optional[SourceLocation] = None
    23→
    24→    @property
    25→    def loc(self) -> Optional[SourceLocation]:
    26→        return getattr(self, '_loc', None)
    27→
    28→    @loc.setter
    29→    def loc(self, value: Optional[SourceLocation]):
    30→        self._loc = value
    31→
    32→    def to_dict(self) -> dict:
    33→        """Convert node to dictionary for testing/serialization."""
    34→        result = {"type": self.__class__.__name__}
    35→        for key, value in self.__dict__.items():
    36→            if key.startswith('_'):
    37→                continue  # Skip private attributes like _loc
    38→            if isinstance(value, Node):
    39→                result[key] = value.to_dict()
    40→            elif isinstance(value, list):
    41→                result[key] = [
    42→                    v.to_dict() if isinstance(v, Node) else v
    43→                    for v in value
    44→                ]
    45→            else:
    46→                result[key] = value
    47→        return result
    48→
    49→
    50→# Literals
    51→@dataclass

...........................................................              [100%]
59 passed in 0.17s

     1→"""JavaScript parser - produces an AST from tokens."""
     2→
     3→from typing import List, Optional, Callable
     4→from .lexer import Lexer
     5→from .tokens import Token, TokenType
     6→from .errors import JSSyntaxError
     7→from .ast_nodes import (
     8→    Node, Program, NumericLiteral, StringLiteral, BooleanLiteral, NullLiteral,
     9→    RegexLiteral, Identifier, ThisExpression, ArrayExpression, ObjectExpression, Property,
    10→    UnaryExpression, UpdateExpression, BinaryExpression, LogicalExpression,
    11→    ConditionalExpression, AssignmentExpression, SequenceExpression,
    12→    MemberExpression, CallExpression, NewExpression,
    13→    ExpressionStatement, BlockStatement, EmptyStatement,
    14→    VariableDeclaration, VariableDeclarator,
    15→    IfStatement, WhileStatement, DoWhileStatement, ForStatement,
    16→    ForInStatement, ForOfStatement, BreakStatement, ContinueStatement,
    17→    ReturnStatement, ThrowStatement, TryStatement, CatchClause,
    18→    SwitchStatement, SwitchCase, LabeledStatement,
    19→    FunctionDeclaration, FunctionExpression, ArrowFunctionExpression,
    20→)
    21→
    22→
    23→# Operator precedence (higher = binds tighter)
    24→PRECEDENCE = {
    25→    "||": 1,

<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/parser.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
     1→"""JavaScript parser - produces an AST from tokens."""
     2→
     3→from typing import List, Optional, Callable
     4→from .lexer import Lexer
     5→from .tokens import Token, TokenType
     6→from .errors import JSSyntaxError
     7→from .ast_nodes import (
     8→    Node, Program, NumericLiteral, StringLiteral, BooleanLiteral, NullLiteral,
     9→    RegexLiteral, Identifier, ThisExpression, ArrayExpression, ObjectExpression, Property,
    10→    UnaryExpression, UpdateExpression, BinaryExpression, LogicalExpression,
    11→    ConditionalExpression, AssignmentExpression, SequenceExpression,
    12→    MemberExpression, CallExpression, NewExpression,
    13→    ExpressionStatement, BlockStatement, EmptyStatement,
    14→    VariableDeclaration, VariableDeclarator,
    15→    IfStatement, WhileStatement, DoWhileStatement, ForStatement,
    16→    ForInStatement, ForOfStatement, BreakStatement, ContinueStatement,
    17→    ReturnStatement, ThrowStatement, TryStatement, CatchClause,
    18→    SwitchStatement, SwitchCase, LabeledStatement,
    19→    FunctionDeclaration, FunctionExpression, ArrowFunctionExpression,
    20→    SourceLocation,
    21→)
    22→
    23→
    24→# Operator precedence (higher = binds tighter)
    25→PRECEDENCE = {

    39→
    40→class Parser:
    41→    """Recursive descent parser for JavaScript."""
    42→
    43→    def __init__(self, source: str):
    44→        self.lexer = Lexer(source)
    45→        self.current: Token = self.lexer.next_token()
    46→        self.previous: Optional[Token] = None
    47→
    48→    def _error(self, message: str) -> JSSyntaxError:
    49→        """Create a syntax error at current position."""
    50→        return JSSyntaxError(message, self.current.line, self.current.column)
    51→
    52→    def _advance(self) -> Token:
    53→        """Advance to next token and return previous."""
    54→        self.previous = self.current
    55→        self.current = self.lexer.next_token()
    56→        return self.previous
    57→
    58→    def _check(self, *types: TokenType) -> bool:
    59→        """Check if current token is one of the given types."""
    60→        return self.current.type in types
    61→
    62→    def _match(self, *types: TokenType) -> bool:
    63→        """If current token matches, advance and return True."""
    64→        if self._check(*types):
    65→            self._advance()
    66→            return True
    67→        return False
    68→
    69→    def _expect(self, token_type: TokenType, message: str) -> Token:
    70→        """Expect a specific token type or raise error."""
    71→        if self.current.type != token_type:
    72→            raise self._error(message)
    73→        return self._advance()
    74→
    75→    def _is_at_end(self) -> bool:
    76→        """Check if we've reached the end of input."""
    77→        return self.current.type == TokenType.EOF
    78→

<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/parser.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    44→        self.lexer = Lexer(source)
    45→        self.current: Token = self.lexer.next_token()
    46→        self.previous: Optional[Token] = None
    47→
    48→    def _error(self, message: str) -> JSSyntaxError:
    49→        """Create a syntax error at current position."""
    50→        return JSSyntaxError(message, self.current.line, self.current.column)
    51→
    52→    def _loc(self, node: Node, token: Optional[Token] = None) -> Node:
    53→        """Set source location on a node and return it."""
    54→        t = token or self.previous or self.current
    55→        node.loc = SourceLocation(t.line, t.column)
    56→        return node
    57→
    58→    def _advance(self) -> Token:
    59→        """Advance to next token and return previous."""
    60→        self.previous = self.current
    61→        self.current = self.lexer.next_token()
    62→        return self.previous

179:                return LabeledStatement(Identifier(label_token.value), body)
204:            declarations.append(VariableDeclarator(Identifier(name.value), init))
258:                    [VariableDeclarator(Identifier(name.value), None)]
267:                    [VariableDeclarator(Identifier(name.value), None)]
275:                declarations = [VariableDeclarator(Identifier(name.value), var_init)]
281:                    declarations.append(VariableDeclarator(Identifier(n.value), vi))
322:            label = Identifier(self._advance().value)
331:            label = Identifier(self._advance().value)
347:        return ThrowStatement(argument)
360:            handler = CatchClause(Identifier(param.value), catch_body)
405:        return FunctionDeclaration(Identifier(name.value), params, body)
414:                params.append(Identifier(param.value))
525:        param = Identifier(self._advance().value)  # Get the param name
543:            params.append(Identifier(self._expect(TokenType.IDENTIFIER, "Expected parameter name").value))
545:                params.append(Identifier(self._expect(TokenType.IDENTIFIER, "Expected parameter name").value))
686:                    expr = MemberExpression(expr, Identifier(prop.value), computed=False)
691:                    expr = MemberExpression(expr, Identifier(prop_name), computed=False)
735:    def _parse_primary_expression(self) -> Node:
739:            return NumericLiteral(self.previous.value)
742:            return StringLiteral(self.previous.value)
757:            return Identifier(self.previous.value)
820:                    key = Identifier("get")
827:                    key = Identifier("get")
839:                    key = Identifier("set")
845:                    key = Identifier("set")
859:            key = StringLiteral(self.previous.value)
861:            key = NumericLiteral(self.previous.value)
863:            key = Identifier(self.previous.value)
866:            key = Identifier(self.current.value if hasattr(self.current, 'value') else self.current.type.name.lower())
883:                    params.append(Identifier(param.value))
904:            name = Identifier(self._advance().value)

   340→        self._consume_semicolon()
   341→        return ReturnStatement(argument)
   342→
   343→    def _parse_throw_statement(self) -> ThrowStatement:
   344→        """Parse throw statement."""
   345→        argument = self._parse_expression()
   346→        self._consume_semicolon()
   347→        return ThrowStatement(argument)
   348→
   349→    def _parse_try_statement(self) -> TryStatement:
   350→        """Parse try statement."""
   351→        block = self._parse_block_statement()
   352→        handler = None
   353→        finalizer = None
   354→

<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/parser.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   339→            argument = self._parse_expression()
   340→        self._consume_semicolon()
   341→        return ReturnStatement(argument)
   342→
   343→    def _parse_throw_statement(self) -> ThrowStatement:
   344→        """Parse throw statement."""
   345→        throw_token = self.previous  # The 'throw' keyword
   346→        argument = self._parse_expression()
   347→        self._consume_semicolon()
   348→        return self._loc(ThrowStatement(argument), throw_token)
   349→
   350→    def _parse_try_statement(self) -> TryStatement:
   351→        """Parse try statement."""
   352→        block = self._parse_block_statement()

   735→
   736→    def _parse_primary_expression(self) -> Node:
   737→        """Parse primary expression (literals, identifiers, grouped)."""
   738→        # Literals
   739→        if self._match(TokenType.NUMBER):
   740→            return NumericLiteral(self.previous.value)
   741→
   742→        if self._match(TokenType.STRING):
   743→            return StringLiteral(self.previous.value)
   744→
   745→        if self._match(TokenType.TRUE):
   746→            return BooleanLiteral(True)
   747→
   748→        if self._match(TokenType.FALSE):
   749→            return BooleanLiteral(False)
   750→
   751→        if self._match(TokenType.NULL):
   752→            return NullLiteral()
   753→
   754→        if self._match(TokenType.THIS):
   755→            return ThisExpression()
   756→
   757→        if self._match(TokenType.IDENTIFIER):
   758→            return Identifier(self.previous.value)
   759→
   760→        # Parenthesized expression
   761→        if self._match(TokenType.LPAREN):
   762→            expr = self._parse_expression()
   763→            self._expect(TokenType.RPAREN, "Expected ')' after expression")
   764→            return expr
   765→
   766→        # Array literal
   767→        if self._match(TokenType.LBRACKET):
   768→            return self._parse_array_literal()
   769→
   770→        # Object literal (need to be careful with block statements)
   771→        if self._match(TokenType.LBRACE):
   772→            return self._parse_object_literal()
   773→
   774→        # Function expression

<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/parser.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   732→                if not self._match(TokenType.COMMA):
   733→                    break
   734→        return args
   735→
   736→    def _parse_primary_expression(self) -> Node:
   737→        """Parse primary expression (literals, identifiers, grouped)."""
   738→        # Literals
   739→        if self._match(TokenType.NUMBER):
   740→            return self._loc(NumericLiteral(self.previous.value))
   741→
   742→        if self._match(TokenType.STRING):
   743→            return self._loc(StringLiteral(self.previous.value))
   744→
   745→        if self._match(TokenType.TRUE):
   746→            return self._loc(BooleanLiteral(True))
   747→
   748→        if self._match(TokenType.FALSE):
   749→            return self._loc(BooleanLiteral(False))
   750→
   751→        if self._match(TokenType.NULL):
   752→            return self._loc(NullLiteral())
   753→
   754→        if self._match(TokenType.THIS):
   755→            return self._loc(ThisExpression())
   756→
   757→        if self._match(TokenType.IDENTIFIER):
   758→            return self._loc(Identifier(self.previous.value))
   759→
   760→        # Parenthesized expression
   761→        if self._match(TokenType.LPAREN):
   762→            expr = self._parse_expression()

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

The file /home/user/mquickjs-python/src/mquickjs_python/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    19→from .opcodes import OpCode
    20→from .values import UNDEFINED
    21→
    22→
    23→@dataclass
    24→class CompiledFunction:
    25→    """A compiled function."""
    26→    name: str
    27→    params: List[str]
    28→    bytecode: bytes
    29→    constants: List[Any]
    30→    locals: List[str]
    31→    num_locals: int
    32→    free_vars: List[str] = field(default_factory=list)  # Variables captured from outer scope
    33→    cell_vars: List[str] = field(default_factory=list)  # Local variables that are captured by inner functions
    34→    source_map: Dict[int, Tuple[int, int]] = field(default_factory=dict)  # bytecode_pos -> (line, column)
    35→
    36→
    37→@dataclass
    38→class LoopContext:

    51→
    52→class Compiler:
    53→    """Compiles AST to bytecode."""
    54→
    55→    def __init__(self):
    56→        self.bytecode: List[int] = []
    57→        self.constants: List[Any] = []
    58→        self.names: List[str] = []
    59→        self.locals: List[str] = []
    60→        self.loop_stack: List[LoopContext] = []
    61→        self.try_stack: List[TryContext] = []  # Track try-finally for break/continue/return
    62→        self.functions: List[CompiledFunction] = []
    63→        self._in_function: bool = False  # Track if we're compiling inside a function
    64→        self._outer_locals: List[List[str]] = []  # Stack of outer scope locals
    65→        self._free_vars: List[str] = []  # Free variables captured from outer scopes
    66→        self._cell_vars: List[str] = []  # Local variables captured by inner functions
    67→
    68→    def compile(self, node: Program) -> CompiledFunction:
    69→        """Compile a program to bytecode."""
    70→        body = node.body
    71→
    72→        # Compile all statements except the last one
    73→        for stmt in body[:-1] if body else []:
    74→            self._compile_statement(stmt)
    75→
    76→        # For the last statement, compile with completion value semantics
    77→        if body:
    78→            self._compile_statement_for_value(body[-1])
    79→            self._emit(OpCode.RETURN)
    80→        else:
    81→            # Empty program returns undefined
    82→            self._emit(OpCode.LOAD_UNDEFINED)
    83→            self._emit(OpCode.RETURN)
    84→
    85→        return CompiledFunction(
    86→            name="<program>",
    87→            params=[],
    88→            bytecode=bytes(self.bytecode),
    89→            constants=self.constants,
    90→            locals=self.locals,
    91→            num_locals=len(self.locals),
    92→        )
    93→
    94→    # Opcodes that use 16-bit arguments (jumps and jump-like)
    95→    _JUMP_OPCODES = frozenset([OpCode.JUMP, OpCode.JUMP_IF_FALSE, OpCode.JUMP_IF_TRUE, OpCode.TRY_START])
    96→
    97→    def _emit(self, opcode: OpCode, arg: Optional[int] = None) -> int:
    98→        """Emit an opcode, return its position."""
    99→        pos = len(self.bytecode)
   100→        self.bytecode.append(opcode)

<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/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    48→    """Context for try-finally blocks (for break/continue/return)."""
    49→    finalizer: Any = None  # The finally block AST node
    50→
    51→
    52→class Compiler:
    53→    """Compiles AST to bytecode."""
    54→
    55→    def __init__(self):
    56→        self.bytecode: List[int] = []
    57→        self.constants: List[Any] = []
    58→        self.names: List[str] = []
    59→        self.locals: List[str] = []
    60→        self.loop_stack: List[LoopContext] = []
    61→        self.try_stack: List[TryContext] = []  # Track try-finally for break/continue/return
    62→        self.functions: List[CompiledFunction] = []
    63→        self._in_function: bool = False  # Track if we're compiling inside a function
    64→        self._outer_locals: List[List[str]] = []  # Stack of outer scope locals
    65→        self._free_vars: List[str] = []  # Free variables captured from outer scopes
    66→        self._cell_vars: List[str] = []  # Local variables captured by inner functions
    67→        self.source_map: Dict[int, Tuple[int, int]] = {}  # bytecode_pos -> (line, column)
    68→        self._current_loc: Optional[Tuple[int, int]] = None  # Current source location
    69→
    70→    def compile(self, node: Program) -> CompiledFunction:
    71→        """Compile a program to bytecode."""
    72→        body = node.body

The file /home/user/mquickjs-python/src/mquickjs_python/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    83→            # Empty program returns undefined
    84→            self._emit(OpCode.LOAD_UNDEFINED)
    85→            self._emit(OpCode.RETURN)
    86→
    87→        return CompiledFunction(
    88→            name="<program>",
    89→            params=[],
    90→            bytecode=bytes(self.bytecode),
    91→            constants=self.constants,
    92→            locals=self.locals,
    93→            num_locals=len(self.locals),
    94→            source_map=self.source_map,
    95→        )
    96→
    97→    # Opcodes that use 16-bit arguments (jumps and jump-like)
    98→    _JUMP_OPCODES = frozenset([OpCode.JUMP, OpCode.JUMP_IF_FALSE, OpCode.JUMP_IF_TRUE, OpCode.TRY_START])
    99→

    97→    # Opcodes that use 16-bit arguments (jumps and jump-like)
    98→    _JUMP_OPCODES = frozenset([OpCode.JUMP, OpCode.JUMP_IF_FALSE, OpCode.JUMP_IF_TRUE, OpCode.TRY_START])
    99→
   100→    def _emit(self, opcode: OpCode, arg: Optional[int] = None) -> int:
   101→        """Emit an opcode, return its position."""
   102→        pos = len(self.bytecode)
   103→        self.bytecode.append(opcode)
   104→        if arg is not None:
   105→            if opcode in self._JUMP_OPCODES:
   106→                # 16-bit little-endian for jump targets
   107→                self.bytecode.append(arg & 0xFF)
   108→                self.bytecode.append((arg >> 8) & 0xFF)
   109→            else:
   110→                self.bytecode.append(arg)
   111→        return pos
   112→
   113→    def _emit_jump(self, opcode: OpCode) -> int:
   114→        """Emit a jump instruction, return position for patching.
   115→
   116→        Uses 16-bit (2 byte) little-endian offset.

<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/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
    96→
    97→    # Opcodes that use 16-bit arguments (jumps and jump-like)
    98→    _JUMP_OPCODES = frozenset([OpCode.JUMP, OpCode.JUMP_IF_FALSE, OpCode.JUMP_IF_TRUE, OpCode.TRY_START])
    99→
   100→    def _emit(self, opcode: OpCode, arg: Optional[int] = None) -> int:
   101→        """Emit an opcode, return its position."""
   102→        pos = len(self.bytecode)
   103→        # Record source location for this bytecode position
   104→        if self._current_loc is not None:
   105→            self.source_map[pos] = self._current_loc
   106→        self.bytecode.append(opcode)
   107→        if arg is not None:
   108→            if opcode in self._JUMP_OPCODES:
   109→                # 16-bit little-endian for jump targets
   110→                self.bytecode.append(arg & 0xFF)
   111→                self.bytecode.append((arg >> 8) & 0xFF)
   112→            else:
   113→                self.bytecode.append(arg)
   114→        return pos
   115→
   116→    def _set_loc(self, node: Node) -> None:
   117→        """Set current source location from an AST node."""
   118→        if node.loc is not None:
   119→            self._current_loc = (node.loc.line, node.loc.column)
   120→
   121→    def _emit_jump(self, opcode: OpCode) -> int:
   122→        """Emit a jump instruction, return position for patching.
   123→

15:    ReturnStatement, ThrowStatement, TryStatement, CatchClause,
322:            self._compile_expression(node.expression)
336:                    self._compile_expression(decl.init)
357:            self._compile_expression(node.test)
376:            self._compile_expression(node.test)
402:            self._compile_expression(node.test)
423:                    self._compile_expression(node.init)
431:                self._compile_expression(node.test)
440:                self._compile_expression(node.update)
461:            self._compile_expression(node.right)
494:                self._compile_expression(node.left.object)
496:                    self._compile_expression(node.left.property)
528:            self._compile_expression(node.right)
635:                self._compile_expression(node.argument)
640:        elif isinstance(node, ThrowStatement):
641:            self._compile_expression(node.argument)
688:            self._compile_expression(node.discriminant)
697:                    self._compile_expression(case.test)
786:            self._compile_expression(node.expression)
801:            self._compile_expression(node.test)
909:            self._compile_expression(node.body)
1041:    def _compile_expression(self, node: Node) -> None:
1089:                self._compile_expression(elem)
1099:                    self._compile_expression(prop.key)
1104:                self._compile_expression(prop.value)
1132:                    self._compile_expression(node.argument.object)
1134:                        self._compile_expression(node.argument.property)
1143:                self._compile_expression(node.argument)
1147:                self._compile_expression(node.argument)
1227:                self._compile_expression(node.argument.object)
1230:                    self._compile_expression(node.argument.property)
1264:            self._compile_expression(node.left)
1265:            self._compile_expression(node.right)
1296:            self._compile_expression(node.left)
1302:                self._compile_expression(node.right)
1309:                self._compile_expression(node.right)
1313:            self._compile_expression(node.test)
1315:            self._compile_expression(node.consequent)
1318:            self._compile_expression(node.alternate)
1325:                    self._compile_expression(node.right)
1342:                    self._compile_expression(node.right)
1373:                self._compile_expression(node.left.object)
1375:                    self._compile_expression(node.left.property)
1379:                self._compile_expression(node.right)
1384:                self._compile_expression(expr)
1389:            self._compile_expression(node.object)
1391:                self._compile_expression(node.property)
1400:                self._compile_expression(node.callee.object)
1403:                    self._compile_expression(node.callee.property)
1409:                    self._compile_expression(arg)
1413:                self._compile_expression(node.callee)
1415:                    self._compile_expression(arg)
1419:            self._compile_expression(node.callee)
1421:                self._compile_expression(arg)

   635→                self._compile_expression(node.argument)
   636→                self._emit(OpCode.RETURN)
   637→            else:
   638→                self._emit(OpCode.RETURN_UNDEFINED)
   639→
   640→        elif isinstance(node, ThrowStatement):
   641→            self._compile_expression(node.argument)
   642→            self._emit(OpCode.THROW)
   643→
   644→        elif isinstance(node, TryStatement):
   645→            # Push TryContext if there's a finally block so break/continue/return
   646→            # can inline the finally code
   647→            if node.finalizer:
   648→                self.try_stack.append(TryContext(finalizer=node.finalizer))
   649→

<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/compiler.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   636→                self._emit(OpCode.RETURN)
   637→            else:
   638→                self._emit(OpCode.RETURN_UNDEFINED)
   639→
   640→        elif isinstance(node, ThrowStatement):
   641→            self._set_loc(node)  # Record location of throw statement
   642→            self._compile_expression(node.argument)
   643→            self._emit(OpCode.THROW)
   644→
   645→        elif isinstance(node, TryStatement):
   646→            # Push TryContext if there's a finally block so break/continue/return
   647→            # can inline the finally code

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

     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, JSArrayBuffer,
    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:
    31→            return math.floor(x * multiplier + 0.5) / multiplier
    32→        else:
    33→            return math.ceil(x * multiplier - 0.5) / multiplier
    34→
    35→
    36→@dataclass
    37→class ClosureCell:
    38→    """A cell for closure variable - allows sharing between scopes."""
    39→    value: JSValue
    40→
    41→
    42→@dataclass
    43→class CallFrame:
    44→    """Call frame on the call stack."""
    45→    func: CompiledFunction
    46→    ip: int  # Instruction pointer
    47→    bp: int  # Base pointer (stack base for this frame)
    48→    locals: List[JSValue]
    49→    this_value: JSValue
    50→    closure_cells: List[ClosureCell] = None  # Cells for captured variables (from outer function)
    51→    cell_storage: List[ClosureCell] = None  # Cells for variables captured by inner functions
    52→    is_constructor_call: bool = False  # True if this frame is from a "new" call
    53→    new_target: JSValue = None  # The new object for constructor calls
    54→
    55→
    56→class ForInIterator:
    57→    """Iterator for for-in loops."""
    58→    def __init__(self, keys: List[str]):
    59→        self.keys = keys
    60→        self.index = 0
    61→
    62→    def next(self) -> Tuple[Optional[str], bool]:
    63→        """Return (key, done)."""
    64→        if self.index >= len(self.keys):
    65→            return None, True
    66→        key = self.keys[self.index]
    67→        self.index += 1
    68→        return key, False
    69→
    70→
    71→class ForOfIterator:
    72→    """Iterator for for-of loops."""
    73→    def __init__(self, values: List):
    74→        self.values = values
    75→        self.index = 0
    76→
    77→    def next(self) -> Tuple[Any, bool]:
    78→        """Return (value, done)."""
    79→        if self.index >= len(self.values):
    80→            return None, 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>

  2205→            self.stack.append(result)
  2206→        else:
  2207→            raise JSTypeError(f"{constructor} is not a constructor")
  2208→
  2209→    def _throw(self, exc: JSValue) -> None:
  2210→        """Throw an exception."""
  2211→        if self.exception_handlers:
  2212→            frame_idx, catch_ip = self.exception_handlers.pop()
  2213→
  2214→            # Unwind call stack
  2215→            while len(self.call_stack) > frame_idx + 1:
  2216→                self.call_stack.pop()
  2217→
  2218→            # Jump to catch handler
  2219→            frame = self.call_stack[-1]
  2220→            frame.ip = catch_ip
  2221→
  2222→            # Push exception value
  2223→            self.stack.append(exc)
  2224→        else:
  2225→            # Uncaught exception
  2226→            if isinstance(exc, str):
  2227→                raise JSError(exc)
  2228→            elif isinstance(exc, JSObject):
  2229→                msg = exc.get("message")
  2230→                raise JSError(to_string(msg) if msg else "Error")
  2231→            else:
  2232→                raise JSError(to_string(exc))
  2233→
  2234→    def _handle_python_exception(self, error_type: str, message: str) -> None:
  2235→        """Convert a Python exception to a JavaScript exception and throw it."""
  2236→        # Get the error constructor from globals
  2237→        error_constructor = self.globals.get(error_type)
  2238→        if error_constructor and hasattr(error_constructor, '_call_fn'):
  2239→            # Create the error object using the constructor
  2240→            # Strip the "TypeError: " prefix from the message if present
  2241→            if message.startswith(f"{error_type}: "):
  2242→                message = message[len(error_type) + 2:]
  2243→            error_obj = error_constructor._call_fn(message)
  2244→            self._throw(error_obj)
  2245→        else:
  2246→            # Fall back to a plain object with message property
  2247→            error_obj = JSObject()
  2248→            error_obj.set("name", error_type)
  2249→            error_obj.set("message", message)
  2250→            self._throw(error_obj)
  2251→

<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:
  2205→            self.stack.append(result)
  2206→        else:
  2207→            raise JSTypeError(f"{constructor} is not a constructor")
  2208→
  2209→    def _get_source_location(self) -> Tuple[Optional[int], Optional[int]]:
  2210→        """Get the source location (line, column) for the current instruction."""
  2211→        if not self.call_stack:
  2212→            return None, None
  2213→        frame = self.call_stack[-1]
  2214→        source_map = getattr(frame.func, 'source_map', None)
  2215→        if source_map:
  2216→            # Find the closest source location at or before current IP
  2217→            # Walk backwards from current IP to find a mapped position
  2218→            for ip in range(frame.ip, -1, -1):
  2219→                if ip in source_map:
  2220→                    return source_map[ip]
  2221→        return None, None
  2222→
  2223→    def _throw(self, exc: JSValue) -> None:
  2224→        """Throw an exception."""
  2225→        # Try to add source location to error object
  2226→        if isinstance(exc, JSObject):
  2227→            line, column = self._get_source_location()
  2228→            if line is not None:
  2229→                exc.set("lineNumber", line)
  2230→            if column is not None:
  2231→                exc.set("columnNumber", column)
  2232→
  2233→        if self.exception_handlers:
  2234→            frame_idx, catch_ip = self.exception_handlers.pop()
  2235→
  2236→            # Unwind call stack
  2237→            while len(self.call_stack) > frame_idx + 1:
  2238→                self.call_stack.pop()
  2239→
  2240→            # Jump to catch handler
  2241→            frame = self.call_stack[-1]
  2242→            frame.ip = catch_ip
  2243→
  2244→            # Push exception value
  2245→            self.stack.append(exc)
  2246→        else:
  2247→            # Uncaught exception
  2248→            if isinstance(exc, str):
  2249→                raise JSError(exc)
  2250→            elif isinstance(exc, JSObject):
  2251→                msg = exc.get("message")
  2252→                raise JSError(to_string(msg) if msg else "Error")
  2253→            else:
  2254→                raise JSError(to_string(exc))
  2255→
  2256→    def _handle_python_exception(self, error_type: str, message: str) -> None:
  2257→        """Convert a Python exception to a JavaScript exception and throw it."""
  2258→        # Get the error constructor from globals

============================= 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 3 items

tests/test_known_issues.py::TestErrorLineColumn::test_error_has_line_number XFAIL [ 33%]
tests/test_known_issues.py::TestErrorLineColumn::test_error_has_column_number XFAIL [ 66%]
tests/test_known_issues.py::TestErrorLineColumn::test_syntax_error_position XFAIL [100%]

============================== 3 xfailed in 0.40s ==============================

Error object: [None, None]
Exception: Error: test error

2223:    def _throw(self, exc: JSValue) -> None:
2224-        """Throw an exception."""
2225-        # Try to add source location to error object
2226-        if isinstance(exc, JSObject):
2227-            line, column = self._get_source_location()
2228-            if line is not None:
2229-                exc.set("lineNumber", line)
2230-            if column is not None:
2231-                exc.set("columnNumber", column)
2232-
2233-        if self.exception_handlers:
2234-            frame_idx, catch_ip = self.exception_handlers.pop()
2235-
2236-            # Unwind call stack
2237-            while len(self.call_stack) > frame_idx + 1:
2238-                self.call_stack.pop()
2239-
2240-            # Jump to catch handler
2241-            frame = self.call_stack[-1]
2242-            frame.ip = catch_ip
2243-
2244-            # Push exception value
2245-            self.stack.append(exc)
2246-        else:
2247-            # Uncaught exception
2248-            if isinstance(exc, str):

2209:    def _get_source_location(self) -> Tuple[Optional[int], Optional[int]]:
2210-        """Get the source location (line, column) for the current instruction."""
2211-        if not self.call_stack:
2212-            return None, None
2213-        frame = self.call_stack[-1]
2214-        source_map = getattr(frame.func, 'source_map', None)
2215-        if source_map:
2216-            # Find the closest source location at or before current IP
2217-            # Walk backwards from current IP to find a mapped position
2218-            for ip in range(frame.ip, -1, -1):
2219-                if ip in source_map:
2220-                    return source_map[ip]
2221-        return None, None
2222-
2223-    def _throw(self, exc: JSValue) -> None:
2224-        """Throw an exception."""

32-    free_vars: List[str] = field(default_factory=list)  # Variables captured from outer scope
33-    cell_vars: List[str] = field(default_factory=list)  # Local variables that are captured by inner functions
34:    source_map: Dict[int, Tuple[int, int]] = field(default_factory=dict)  # bytecode_pos -> (line, column)
35-
36-
--
65-        self._free_vars: List[str] = []  # Free variables captured from outer scopes
66-        self._cell_vars: List[str] = []  # Local variables captured by inner functions
67:        self.source_map: Dict[int, Tuple[int, int]] = {}  # bytecode_pos -> (line, column)
68-        self._current_loc: Optional[Tuple[int, int]] = None  # Current source location
69-
--
92-            locals=self.locals,
93-            num_locals=len(self.locals),
94:            source_map=self.source_map,
95-        )
96-
--
103-        # Record source location for this bytecode position
104-        if self._current_loc is not None:
105:            self.source_map[pos] = self._current_loc
106-        self.bytecode.append(opcode)
107-        if arg is not None:

114-        return pos
115-
116:    def _set_loc(self, node: Node) -> None:
117-        """Set current source location from an AST node."""
118-        if node.loc is not None:
119-            self._current_loc = (node.loc.line, node.loc.column)
120-
121-    def _emit_jump(self, opcode: OpCode) -> int:
--
639-
640-        elif isinstance(node, ThrowStatement):
641:            self._set_loc(node)  # Record location of throw statement
642-            self._compile_expression(node.argument)
643-            self._emit(OpCode.THROW)
644-
645-        elif isinstance(node, TryStatement):
646-            # Push TryContext if there's a finally block so break/continue/return

159-
160-        if self._match(TokenType.THROW):
161:            return self._parse_throw_statement()
162-
163-        if self._match(TokenType.TRY):
164-            return self._parse_try_statement()
165-
166-        if self._match(TokenType.SWITCH):
167-            return self._parse_switch_statement()
168-
169-        if self._match(TokenType.FUNCTION):
170-            return self._parse_function_declaration()
171-
--
341-        return ReturnStatement(argument)
342-
343:    def _parse_throw_statement(self) -> ThrowStatement:
344-        """Parse throw statement."""
345-        throw_token = self.previous  # The 'throw' keyword
346-        argument = self._parse_expression()
347-        self._consume_semicolon()
348-        return self._loc(ThrowStatement(argument), throw_token)
349-
350-    def _parse_try_statement(self) -> TryStatement:
351-        """Parse try statement."""
352-        block = self._parse_block_statement()
353-        handler = None

50-        return JSSyntaxError(message, self.current.line, self.current.column)
51-
52:    def _loc(self, node: Node, token: Optional[Token] = None) -> Node:
53-        """Set source location on a node and return it."""
54-        t = token or self.previous or self.current
55-        node.loc = SourceLocation(t.line, t.column)
56-        return node
57-
58-    def _advance(self) -> Token:
59-        """Advance to next token and return previous."""
60-        self.previous = self.current

No matches found

     1→"""JavaScript parser - produces an AST from tokens."""
     2→
     3→from typing import List, Optional, Callable
     4→from .lexer import Lexer
     5→from .tokens import Token, TokenType
     6→from .errors import JSSyntaxError
     7→from .ast_nodes import (
     8→    Node, Program, NumericLiteral, StringLiteral, BooleanLiteral, NullLiteral,
     9→    RegexLiteral, Identifier, ThisExpression, ArrayExpression, ObjectExpression, Property,
    10→    UnaryExpression, UpdateExpression, BinaryExpression, LogicalExpression,
    11→    ConditionalExpression, AssignmentExpression, SequenceExpression,
    12→    MemberExpression, CallExpression, NewExpression,
    13→    ExpressionStatement, BlockStatement, EmptyStatement,
    14→    VariableDeclaration, VariableDeclarator,
    15→    IfStatement, WhileStatement, DoWhileStatement, ForStatement,
    16→    ForInStatement, ForOfStatement, BreakStatement, ContinueStatement,
    17→    ReturnStatement, ThrowStatement, TryStatement, CatchClause,
    18→    SwitchStatement, SwitchCase, LabeledStatement,
    19→    FunctionDeclaration, FunctionExpression, ArrowFunctionExpression,
    20→    SourceLocation,
    21→)
    22→
    23→
    24→# Operator precedence (higher = binds tighter)
    25→PRECEDENCE = {
    26→    "||": 1,
    27→    "&&": 2,
    28→    "|": 3,
    29→    "^": 4,
    30→    "&": 5,

<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>

8:class SourceLocation:
9-    """Source location information for AST nodes."""
10-    line: int = 0
11-    column: int = 0
12-
13-
14-@dataclass
15:class Node:
16-    """Base class for all AST nodes."""
17-
18-    def __post_init__(self):
19-        # Source location - can be set by parser after creation
20-        # Using __post_init__ avoids dataclass field ordering issues
21-        if not hasattr(self, '_loc'):
22-            self._loc: Optional[SourceLocation] = None
23-
24-    @property
25-    def loc(self) -> Optional[SourceLocation]:
26-        return getattr(self, '_loc', None)
27-
28-    @loc.setter
29-    def loc(self, value: Optional[SourceLocation]):
30-        self._loc = value

     1→"""AST node types for JavaScript parser."""
     2→
     3→from dataclasses import dataclass, field
     4→from typing import Any, List, Optional, Union
     5→
     6→
     7→@dataclass
     8→class SourceLocation:
     9→    """Source location information for AST nodes."""
    10→    line: int = 0
    11→    column: int = 0
    12→
    13→
    14→@dataclass
    15→class Node:
    16→    """Base class for all AST nodes."""
    17→
    18→    def __post_init__(self):
    19→        # Source location - can be set by parser after creation
    20→        # Using __post_init__ avoids dataclass field ordering issues
    21→        if not hasattr(self, '_loc'):
    22→            self._loc: Optional[SourceLocation] = None
    23→
    24→    @property
    25→    def loc(self) -> Optional[SourceLocation]:
    26→        return getattr(self, '_loc', None)
    27→
    28→    @loc.setter
    29→    def loc(self, value: Optional[SourceLocation]):
    30→        self._loc = value
    31→
    32→    def to_dict(self) -> dict:
    33→        """Convert node to dictionary for testing/serialization."""
    34→        result = {"type": self.__class__.__name__}
    35→        for key, value in self.__dict__.items():

<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>

=== AST ===
Statement type: ThrowStatement
  loc: SourceLocation(line=1, column=1)
    line=1, column=1

=== Compiled Function ===
source_map: {0: (1, 1), 2: (1, 1), 4: (1, 1), 6: (1, 1), 7: (1, 1), 8: (1, 1)}
bytecode length: 9

Result: [4, 5, 'Error', 'test error']

   230→class TestErrorLineColumn:
   231→    """Tests for error line and column number tracking."""
   232→
   233→    @pytest.mark.xfail(reason="Error.lineNumber not implemented")
   234→    def test_error_has_line_number(self):
   235→        """Error objects should have lineNumber property.
   236→
   237→        Issue: Error objects should have a lineNumber property indicating
   238→        where the error occurred. Currently returns None.
   239→        """
   240→        ctx = JSContext(time_limit=5.0)
   241→        result = ctx.eval('var e = new Error("test"); e.lineNumber')
   242→        assert result is not None
   243→        assert isinstance(result, int)
   244→
   245→    @pytest.mark.xfail(reason="Error.columnNumber not implemented")
   246→    def test_error_has_column_number(self):
   247→        """Error objects should have columnNumber property.
   248→
   249→        Issue: Error objects should have a columnNumber property indicating
   250→        the column where the error occurred. Currently returns None.
   251→        """
   252→        ctx = JSContext(time_limit=5.0)
   253→        result = ctx.eval('var e = new Error("test"); e.columnNumber')
   254→        assert result is not None
   255→        assert isinstance(result, int)
   256→
   257→    @pytest.mark.xfail(reason="SyntaxError position tracking not implemented")
   258→    def test_syntax_error_position(self):
   259→        """SyntaxError should include line and column information.
   260→
   261→        Issue: When a SyntaxError occurs, the error message should include
   262→        the line and column where the error occurred.
   263→        """
   264→        ctx = JSContext(time_limit=5.0)
   265→        try:
   266→            ctx.eval('\n 123 a ')  # Invalid syntax at line 2
   267→        except Exception as e:
   268→            error_msg = str(e)
   269→            # Should contain line info
   270→            assert 'line 2' in error_msg.lower() or ':2:' in error_msg
   271→
   272→
   273→# =============================================================================
   274→# DEEP NESTING / RECURSION LIMIT ISSUES
   275→# =============================================================================
   276→
   277→class TestDeepNesting:
   278→    """Tests for handling deeply nested expressions."""
   279→

<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>

   225→
   226→# =============================================================================
   227→# ERROR LINE/COLUMN TRACKING ISSUES
   228→# =============================================================================
   229→
   230→class TestErrorLineColumn:
   231→    """Tests for error line and column number tracking."""
   232→
   233→    @pytest.mark.xfail(reason="Error.lineNumber not implemented")
   234→    def test_error_has_line_number(self):
   235→        """Error objects should have lineNumber property.
   236→
   237→        Issue: Error objects should have a lineNumber property indicating
   238→        where the error occurred. Currently returns None.
   239→        """
   240→        ctx = JSContext(time_limit=5.0)
   241→        result = ctx.eval('var e = new Error("test"); e.lineNumber')
   242→        assert result is not None
   243→        assert isinstance(result, int)
   244→
   245→    @pytest.mark.xfail(reason="Error.columnNumber not implemented")
   246→    def test_error_has_column_number(self):
   247→        """Error objects should have columnNumber property.
   248→
   249→        Issue: Error objects should have a columnNumber property indicating
   250→        the column where the error occurred. Currently returns None.
   251→        """
   252→        ctx = JSContext(time_limit=5.0)
   253→        result = ctx.eval('var e = new Error("test"); e.columnNumber')
   254→        assert result is not None
   255→        assert isinstance(result, int)
   256→
   257→    @pytest.mark.xfail(reason="SyntaxError position tracking not implemented")
   258→    def test_syntax_error_position(self):
   259→        """SyntaxError should include line and column information.
   260→
   261→        Issue: When a SyntaxError occurs, the error message should include
   262→        the line and column where the error occurred.
   263→        """
   264→        ctx = JSContext(time_limit=5.0)
   265→        try:
   266→            ctx.eval('\n 123 a ')  # Invalid syntax at line 2
   267→        except Exception as e:
   268→            error_msg = str(e)
   269→            # Should contain line info
   270→            assert 'line 2' in error_msg.lower() or ':2:' in error_msg
   271→
   272→
   273→# =============================================================================
   274→# DEEP NESTING / RECURSION LIMIT ISSUES

<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_known_issues.py has been updated. Here's the result of running `cat -n` on a snippet of the edited file:
   222→        result = ctx.eval('a.lastIndex')
   223→        assert result == 0
   224→
   225→
   226→# =============================================================================
   227→# ERROR LINE/COLUMN TRACKING ISSUES
   228→# =============================================================================
   229→
   230→class TestErrorLineColumn:
   231→    """Tests for error line and column number tracking."""
   232→
   233→    def test_thrown_error_has_line_number(self):
   234→        """Thrown errors should have lineNumber property set."""
   235→        ctx = JSContext(time_limit=5.0)
   236→        result = ctx.eval('''
   237→var e;
   238→try {
   239→    throw new Error("test");
   240→} catch(ex) {
   241→    e = ex;
   242→}
   243→e.lineNumber
   244→''')
   245→        assert result == 4  # Line where throw statement is
   246→
   247→    def test_thrown_error_has_column_number(self):
   248→        """Thrown errors should have columnNumber property set."""
   249→        ctx = JSContext(time_limit=5.0)
   250→        result = ctx.eval('''
   251→var e;
   252→try {
   253→    throw new Error("test");
   254→} catch(ex) {
   255→    e = ex;
   256→}
   257→e.columnNumber
   258→''')
   259→        assert result == 5  # Column where throw statement starts
   260→
   261→    def test_thrown_error_line_column_multiline(self):
   262→        """Thrown errors track correct location in multiline code."""
   263→        ctx = JSContext(time_limit=5.0)
   264→        result = ctx.eval('''
   265→var e;
   266→try {
   267→    var x = 1;
   268→    var y = 2;
   269→    throw new Error("test");
   270→} catch(ex) {
   271→    e = ex;
   272→}
   273→[e.lineNumber, e.columnNumber]
   274→''')
   275→        assert result == [6, 5]  # Line 6, column 5
   276→
   277→    @pytest.mark.xfail(reason="Error constructor location tracking not implemented")
   278→    def test_error_constructor_has_line_number(self):
   279→        """Error objects created with 'new' should have lineNumber at creation.
   280→
   281→        Issue: Error objects should have a lineNumber property indicating
   282→        where they were created (not just where thrown). This requires
   283→        tracking the call location during Error construction.
   284→        """
   285→        ctx = JSContext(time_limit=5.0)
   286→        result = ctx.eval('var e = new Error("test"); e.lineNumber')
   287→        assert result is not None
   288→        assert isinstance(result, int)
   289→
   290→    @pytest.mark.xfail(reason="Error constructor location tracking not implemented")
   291→    def test_error_constructor_has_column_number(self):
   292→        """Error objects created with 'new' should have columnNumber at creation.
   293→
   294→        Issue: Error objects should have a columnNumber property indicating
   295→        the column where they were created.
   296→        """
   297→        ctx = JSContext(time_limit=5.0)
   298→        result = ctx.eval('var e = new Error("test"); e.columnNumber')
   299→        assert result is not None
   300→        assert isinstance(result, int)
   301→
   302→    @pytest.mark.xfail(reason="SyntaxError position tracking not implemented")
   303→    def test_syntax_error_position(self):
   304→        """SyntaxError should include line and column information.
   305→
   306→        Issue: When a SyntaxError occurs, the error message should include
   307→        the line and column where the error occurred.
   308→        """
   309→        ctx = JSContext(time_limit=5.0)
   310→        try:
   311→            ctx.eval('\n 123 a ')  # Invalid syntax at line 2
   312→        except Exception as e:
   313→            error_msg = str(e)
   314→            # Should contain line info
   315→            assert 'line 2' in error_msg.lower() or ':2:' in error_msg
   316→
   317→
   318→# =============================================================================
   319→# DEEP NESTING / RECURSION LIMIT ISSUES

============================= 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 6 items

tests/test_known_issues.py::TestErrorLineColumn::test_thrown_error_has_line_number PASSED [ 16%]
tests/test_known_issues.py::TestErrorLineColumn::test_thrown_error_has_column_number PASSED [ 33%]
tests/test_known_issues.py::TestErrorLineColumn::test_thrown_error_line_column_multiline PASSED [ 50%]
tests/test_known_issues.py::TestErrorLineColumn::test_error_constructor_has_line_number XFAIL [ 66%]
tests/test_known_issues.py::TestErrorLineColumn::test_error_constructor_has_column_number XFAIL [ 83%]
tests/test_known_issues.py::TestErrorLineColumn::test_syntax_error_position XFAIL [100%]

========================= 3 passed, 3 xfailed in 0.39s =========================

.......................x..xxx........................................... [ 15%]
....................................xx.....................x.xxx.x.x.x.. [ 31%]
.xxx.x.x.xx............................................................. [ 47%]
........................................................................ [ 62%]
........................................................................ [ 78%]
........................................................................ [ 94%]
..........................                                               [100%]
438 passed, 20 xfailed in 21.91s

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 not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   src/mquickjs_python/ast_nodes.py
	modified:   src/mquickjs_python/compiler.py
	modified:   src/mquickjs_python/context.py
	modified:   src/mquickjs_python/parser.py
	modified:   src/mquickjs_python/vm.py
	modified:   tests/test_known_issues.py

no changes added to commit (use "git add" and/or "git commit -a")
 src/mquickjs_python/ast_nodes.py | 23 +++++++++++++++
 src/mquickjs_python/compiler.py  | 13 +++++++++
 src/mquickjs_python/context.py   |  2 ++
 src/mquickjs_python/parser.py    | 24 ++++++++++------
 src/mquickjs_python/vm.py        | 22 +++++++++++++++
 tests/test_known_issues.py       | 61 ++++++++++++++++++++++++++++++++++------
 6 files changed, 129 insertions(+), 16 deletions(-)

e6602d3 Add fine-grained xfail tests for known issues
0c3f291 Update xfail reasons for remaining test_builtin.js tests
9d23ad2 Fix regex lookahead captures and control character escapes
6229c9c Add complete TypedArray support with ArrayBuffer backing
4b5c19c Remove C QuickJS comparison from tests

6 files changed, 129 insertions(+), 16 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
   e6602d3..e2eff67  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

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 [  5%]
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      [ 23%]
tests/test_js_basic.py::test_mquickjs_js[test_builtin.js-path1] XFAIL    [ 24%]
tests/test_known_issues.py::TestIndirectEval::test_indirect_eval_writes_global XFAIL [ 28%]
tests/test_known_issues.py::TestRegexCaptureGroups::test_capture_group_reset_in_repetition XFAIL [ 29%]
tests/test_known_issues.py::TestRegexCaptureGroups::test_optional_lookahead_no_match XFAIL [ 29%]
tests/test_known_issues.py::TestRegexCaptureGroups::test_repeated_optional_lookahead XFAIL [ 29%]
tests/test_known_issues.py::TestRegexAlternation::test_empty_alternative_in_repetition XFAIL [ 30%]
tests/test_known_issues.py::TestRegexCharacterClass::test_backspace_string_literal XFAIL [ 30%]
tests/test_known_issues.py::TestRegexUnicode::test_lastindex_surrogate_pair XFAIL [ 31%]
tests/test_known_issues.py::TestErrorLineColumn::test_error_constructor_has_line_number XFAIL [ 31%]
tests/test_known_issues.py::TestErrorLineColumn::test_error_constructor_has_column_number XFAIL [ 32%]
tests/test_known_issues.py::TestErrorLineColumn::test_syntax_error_position XFAIL [ 32%]
tests/test_known_issues.py::TestDeepNesting::test_deep_nested_parens XFAIL [ 32%]
tests/test_known_issues.py::TestDeepNesting::test_deep_nested_braces XFAIL [ 33%]
tests/test_known_issues.py::TestDeepNesting::test_deep_nested_arrays XFAIL [ 33%]
tests/test_known_issues.py::TestDeepNesting::test_deep_nested_regex_groups XFAIL [ 33%]
======================= 438 passed, 20 xfailed in 21.23s =======================

73:class TestRegexCaptureGroups:
74-    """Tests for regex capture group behavior."""
75-
76-    @pytest.mark.xfail(reason="Capture groups in repetitions not reset to undefined")
77-    def test_capture_group_reset_in_repetition(self):
78-        """Capture groups in repetitions should reset to undefined.
79-
80-        Issue: When a capture group inside a repetition (* or +) doesn't
81-        participate in a particular iteration, it should be reset to undefined.
82-        Currently the previous iteration's capture is retained.
83-
84-        Pattern: /(z)((a+)?(b+)?(c))*/
85-        String:  'zaacbbbcac'
86-
87-        Iterations:
88-        1. 'aac' -> group 3='aa', group 4=undefined, group 5='c'
89-        2. 'bbbc' -> group 3=undefined, group 4='bbb', group 5='c'
90-        3. 'ac' -> group 3='a', group 4=undefined, group 5='c'
91-
92-        Final result should have group 4=undefined (from iteration 3),
93-        not 'bbb' (from iteration 2).
94-        """
95-        ctx = JSContext(time_limit=5.0)
96-        result = ctx.eval('/(z)((a+)?(b+)?(c))*/.exec("zaacbbbcac")')
97-        expected = ['zaacbbbcac', 'z', 'ac', 'a', None, 'c']
98-        assert result == expected
99-
100-    @pytest.mark.xfail(reason="Optional lookahead group retains capture")
101-    def test_optional_lookahead_no_match(self):
102-        """Optional lookahead that doesn't match should have undefined capture.
103-
104-        Issue: When an optional group containing a lookahead doesn't match,
105-        the capture from the lookahead should be undefined. Currently the
106-        capture from a previous successful lookahead attempt is retained.
107-
108-        Pattern: /(?:(?=(abc)))?a/
109-        String:  'abc'
110-
111-        The outer group (?:...)? is optional. The lookahead (?=(abc)) would
112-        match 'abc', but then 'a' must match. Since the lookahead consumed
113-        nothing, 'a' matches at position 0. But since the outer optional
114-        group could match (lookahead succeeded), it's unclear if the capture
115-        should be retained. Per spec, if the outer group is skipped, captures
116-        inside should be undefined.
117-        """
118-        ctx = JSContext(time_limit=5.0)
119-        result = ctx.eval('/(?:(?=(abc)))?a/.exec("abc")')
120-        # The lookahead succeeds but the optional group as a whole is not required
121-        # Per ES spec, group 1 should be undefined when the optional path is taken
122-        expected = ['a', None]
123-        assert result == expected
--
151:class TestRegexAlternation:
152-    """Tests for regex alternation behavior."""
153-
154-    @pytest.mark.xfail(reason="Alternation with empty alternative doesn't match correctly")
155-    def test_empty_alternative_in_repetition(self):
156-        """Empty alternative in repeated group should work correctly.
157-
158-        Issue: Pattern /(?:|[\\w])+([0-9])/ should match '123a23' fully,
159-        capturing '3' in group 1. The (?:|[\\w])+ means: match either
160-        empty string or a word character, one or more times.
161-
162-        Currently matches only '1' with capture '1'.
163-        """
164-        ctx = JSContext(time_limit=5.0)
165-        result = ctx.eval('/(?:|[\\w])+([0-9])/.exec("123a23")')
166-        expected = ['123a23', '3']
167-        assert result == expected
168-
169-
170-# =============================================================================
171-# REGEX CHARACTER CLASS ISSUES
172-# =============================================================================
173-
174:class TestRegexCharacterClass:
175-    """Tests for regex character class behavior."""
176-
177-    def test_backspace_in_character_class_with_hex(self):
178-        """Backspace in character class matches \\x08 (works correctly)."""
179-        ctx = JSContext(time_limit=5.0)
180-        # \\b in a character class is backspace (0x08)
181-        result = ctx.eval('/[\\b]/.test("\\x08")')
182-        assert result is True
183-
184-    @pytest.mark.xfail(reason="String literal \\b not parsed as backspace")
185-    def test_backspace_string_literal(self):
186-        """String literal \\b should be parsed as backspace character.
187-
188-        Issue: In JavaScript string literals, \\b is the backspace character
189-        (same as \\x08). Currently it seems to be handled differently.
190-        """
191-        ctx = JSContext(time_limit=5.0)
192-        # Both should be backspace
193-        result = ctx.eval('/[\\b]/.test("\\b")')
194-        assert result is True
195-
196-    def test_backspace_outside_class_is_boundary(self):
197-        """\\b outside character class is word boundary (works correctly)."""
198-        ctx = JSContext(time_limit=5.0)
199-        assert ctx.eval('/\\bword\\b/.test("a word here")') is True
200-        assert ctx.eval('/\\bword\\b/.test("awordhere")') is False
201-
202-
203-# =============================================================================
204-# REGEX UNICODE ISSUES
205-# =============================================================================
206-
207:class TestRegexUnicode:
208-    """Tests for regex Unicode handling."""
209-
210-    @pytest.mark.xfail(reason="lastIndex not reset correctly for surrogate pairs")
211-    def test_lastindex_surrogate_pair(self):
212-        """lastIndex pointing to second surrogate should reset to 0.
213-
214-        Issue: When lastIndex points to the second element of a surrogate
215-        pair in unicode mode, exec should fail and reset lastIndex to 0.
216-        Currently lastIndex becomes 2 instead of 0.
217-        """
218-        ctx = JSContext(time_limit=5.0)
219-        ctx.eval('var a = /(?:)/gu;')
220-        ctx.eval('a.lastIndex = 1;')  # Point to middle of surrogate pair
221-        ctx.eval('a.exec("🐱");')  # 🐱 is a surrogate pair
222-        result = ctx.eval('a.lastIndex')
223-        assert result == 0
224-
225-
226-# =============================================================================
227-# ERROR LINE/COLUMN TRACKING ISSUES
228-# =============================================================================
229-
230-class TestErrorLineColumn:
231-    """Tests for error line and column number tracking."""
232-
233-    def test_thrown_error_has_line_number(self):
234-        """Thrown errors should have lineNumber property set."""
235-        ctx = JSContext(time_limit=5.0)
236-        result = ctx.eval('''
237-var e;
238-try {
239-    throw new Error("test");
240-} catch(ex) {
241-    e = ex;
242-}
243-e.lineNumber
244-''')
245-        assert result == 4  # Line where throw statement is
246-
247-    def test_thrown_error_has_column_number(self):
248-        """Thrown errors should have columnNumber property set."""
249-        ctx = JSContext(time_limit=5.0)
250-        result = ctx.eval('''
251-var e;
252-try {
253-    throw new Error("test");
254-} catch(ex) {
255-    e = ex;
256-}
257-e.columnNumber

/home/user/mquickjs-python/.venv/lib/python3.11/site-packages/pygments/regexopt.py
/home/user/mquickjs-python/src/mquickjs_python/regex/regex.py

/home/user/mquickjs-python/src/mquickjs_python/regex/opcodes.py
/home/user/mquickjs-python/src/mquickjs_python/regex/compiler.py
/home/user/mquickjs-python/src/mquickjs_python/regex/regex.py
/home/user/mquickjs-python/src/mquickjs_python/regex/__init__.py
/home/user/mquickjs-python/src/mquickjs_python/regex/vm.py
/home/user/mquickjs-python/src/mquickjs_python/regex/parser.py

     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→
    51→class RegexVM:
    52→    """
    53→    Regex bytecode virtual machine.
    54→
    55→    Implements NFA-based matching with explicit backtracking stack.
    56→    """
    57→
    58→    # Default limits
    59→    DEFAULT_STACK_LIMIT = 10000
    60→    DEFAULT_POLL_INTERVAL = 100
    61→    DEFAULT_STEP_LIMIT = 100000  # Hard limit on execution steps
    62→
    63→    def __init__(
    64→        self,
    65→        bytecode: List[Tuple],
    66→        capture_count: int,
    67→        flags: str = "",
    68→        poll_callback: Optional[Callable[[], bool]] = None,
    69→        stack_limit: int = DEFAULT_STACK_LIMIT,
    70→        poll_interval: int = DEFAULT_POLL_INTERVAL,
    71→        step_limit: int = DEFAULT_STEP_LIMIT
    72→    ):
    73→        """
    74→        Initialize regex VM.
    75→
    76→        Args:
    77→            bytecode: Compiled bytecode
    78→            capture_count: Number of capture groups
    79→            flags: Regex flags
    80→            poll_callback: Called periodically; return True to abort
    81→            stack_limit: Maximum backtrack stack size
    82→            poll_interval: Steps between poll calls
    83→            step_limit: Maximum execution steps (ReDoS protection)
    84→        """
    85→        self.bytecode = bytecode
    86→        self.capture_count = capture_count
    87→        self.flags = flags
    88→        self.poll_callback = poll_callback
    89→        self.stack_limit = stack_limit
    90→        self.poll_interval = poll_interval
    91→        self.step_limit = step_limit
    92→
    93→        self.ignorecase = 'i' in flags
    94→        self.multiline = 'm' in flags
    95→        self.dotall = 's' in flags
    96→
    97→    def match(self, string: str, start_pos: int = 0) -> Optional[MatchResult]:
    98→        """
    99→        Try to match at a specific position.
   100→
   101→        Args:
   102→            string: Input string
   103→            start_pos: Position to start matching
   104→
   105→        Returns:
   106→            MatchResult if match found, None otherwise
   107→        """
   108→        return self._execute(string, start_pos, anchored=True)
   109→
   110→    def search(self, string: str, start_pos: int = 0) -> Optional[MatchResult]:
   111→        """
   112→        Search for match anywhere in string.
   113→
   114→        Args:
   115→            string: Input string
   116→            start_pos: Position to start searching
   117→
   118→        Returns:
   119→            MatchResult if match found, None otherwise
   120→        """
   121→        # Try matching at each position
   122→        for pos in range(start_pos, len(string) + 1):
   123→            result = self._execute(string, pos, anchored=False)
   124→            if result is not None:
   125→                return result
   126→        return None
   127→
   128→    def _execute(self, string: str, start_pos: int, anchored: bool) -> Optional[MatchResult]:
   129→        """
   130→        Execute bytecode against string.
   131→
   132→        This is the main execution loop.
   133→        """
   134→        # Execution state
   135→        pc = 0  # Program counter
   136→        sp = start_pos  # String position
   137→        step_count = 0
   138→
   139→        # Capture positions: list of (start, end) for each group
   140→        # -1 means unset
   141→        captures = [[-1, -1] for _ in range(self.capture_count)]
   142→
   143→        # Registers for position tracking (ReDoS protection)
   144→        registers: List[int] = []
   145→
   146→        # Backtrack stack: list of (pc, sp, captures_snapshot, registers_snapshot)
   147→        stack: List[Tuple] = []
   148→
   149→        while True:
   150→            # Check limits periodically
   151→            step_count += 1
   152→            if step_count % self.poll_interval == 0:
   153→                if self.poll_callback and self.poll_callback():
   154→                    raise RegexTimeoutError("Regex execution timed out")
   155→
   156→            # Hard step limit for ReDoS protection
   157→            if step_count > self.step_limit:
   158→                return None  # Fail gracefully on ReDoS
   159→
   160→            # Stack overflow protection
   161→            if len(stack) > self.stack_limit:
   162→                raise RegexStackOverflow("Regex stack overflow")
   163→
   164→            # Fetch instruction
   165→            if pc >= len(self.bytecode):
   166→                # Fell off end - no match
   167→                if not stack:
   168→                    return None
   169→                pc, sp, captures, registers = self._backtrack(stack)
   170→                continue
   171→
   172→            instr = self.bytecode[pc]
   173→            opcode = instr[0]
   174→
   175→            # Execute instruction
   176→            if opcode == Op.CHAR:
   177→                char_code = instr[1]
   178→                if sp >= len(string):
   179→                    if not stack:
   180→                        return None
   181→                    pc, sp, captures, registers = self._backtrack(stack)
   182→                    continue
   183→
   184→                ch = string[sp]
   185→                if self.ignorecase:
   186→                    match = ord(ch.lower()) == char_code or ord(ch.upper()) == char_code
   187→                else:
   188→                    match = ord(ch) == char_code
   189→
   190→                if match:
   191→                    sp += 1
   192→                    pc += 1
   193→                else:
   194→                    if not stack:
   195→                        return None
   196→                    pc, sp, captures, registers = self._backtrack(stack)
   197→
   198→            elif opcode == Op.DOT:
   199→                if sp >= len(string) or string[sp] == '\n':
   200→                    if not stack:
   201→                        return None
   202→                    pc, sp, captures, registers = self._backtrack(stack)
   203→                    continue
   204→                sp += 1
   205→                pc += 1
   206→
   207→            elif opcode == Op.ANY:
   208→                if sp >= len(string):
   209→                    if not stack:
   210→                        return None
   211→                    pc, sp, captures, registers = self._backtrack(stack)
   212→                    continue
   213→                sp += 1
   214→                pc += 1
   215→
   216→            elif opcode == Op.DIGIT:
   217→                if sp >= len(string) or not string[sp].isdigit():
   218→                    if not stack:
   219→                        return None
   220→                    pc, sp, captures, registers = self._backtrack(stack)
   221→                    continue
   222→                sp += 1
   223→                pc += 1
   224→
   225→            elif opcode == Op.NOT_DIGIT:
   226→                if sp >= len(string) or string[sp].isdigit():
   227→                    if not stack:
   228→                        return None
   229→                    pc, sp, captures, registers = self._backtrack(stack)
   230→                    continue
   231→                sp += 1
   232→                pc += 1
   233→
   234→            elif opcode == Op.WORD:
   235→                if sp >= len(string) or not (string[sp].isalnum() or string[sp] == '_'):
   236→                    if not stack:
   237→                        return None
   238→                    pc, sp, captures, registers = self._backtrack(stack)
   239→                    continue
   240→                sp += 1
   241→                pc += 1
   242→
   243→            elif opcode == Op.NOT_WORD:
   244→                if sp >= len(string) or (string[sp].isalnum() or string[sp] == '_'):
   245→                    if not stack:
   246→                        return None
   247→                    pc, sp, captures, registers = self._backtrack(stack)
   248→                    continue
   249→                sp += 1
   250→                pc += 1
   251→
   252→            elif opcode == Op.SPACE:
   253→                if sp >= len(string) or not string[sp].isspace():
   254→                    if not stack:
   255→                        return None
   256→                    pc, sp, captures, registers = self._backtrack(stack)
   257→                    continue
   258→                sp += 1
   259→                pc += 1
   260→
   261→            elif opcode == Op.NOT_SPACE:
   262→                if sp >= len(string) or string[sp].isspace():
   263→                    if not stack:
   264→                        return None
   265→                    pc, sp, captures, registers = self._backtrack(stack)
   266→                    continue
   267→                sp += 1
   268→                pc += 1
   269→
   270→            elif opcode == Op.RANGE:
   271→                ranges = instr[1]
   272→                if sp >= len(string):
   273→                    if not stack:
   274→                        return None
   275→                    pc, sp, captures, registers = self._backtrack(stack)
   276→                    continue
   277→
   278→                ch = string[sp]
   279→                ch_code = ord(ch.lower() if self.ignorecase else ch)
   280→
   281→                matched = False
   282→                for start, end in ranges:
   283→                    if self.ignorecase:
   284→                        # Check both cases
   285→                        if start <= ch_code <= end:
   286→                            matched = True
   287→                            break
   288→                        ch_upper = ord(ch.upper())
   289→                        if start <= ch_upper <= end:
   290→                            matched = True
   291→                            break
   292→                    else:
   293→                        if start <= ch_code <= end:
   294→                            matched = True
   295→                            break
   296→
   297→                if matched:
   298→                    sp += 1
   299→                    pc += 1
   300→                else:
   301→                    if not stack:
   302→                        return None
   303→                    pc, sp, captures, registers = self._backtrack(stack)
   304→
   305→            elif opcode == Op.RANGE_NEG:
   306→                ranges = instr[1]
   307→                if sp >= len(string):
   308→                    if not stack:
   309→                        return None
   310→                    pc, sp, captures, registers = self._backtrack(stack)
   311→                    continue
   312→
   313→                ch = string[sp]
   314→                ch_code = ord(ch.lower() if self.ignorecase else ch)
   315→
   316→                matched = False
   317→                for start, end in ranges:
   318→                    if start <= ch_code <= end:
   319→                        matched = True
   320→                        break
   321→
   322→                if not matched:
   323→                    sp += 1
   324→                    pc += 1
   325→                else:
   326→                    if not stack:
   327→                        return None
   328→                    pc, sp, captures, registers = self._backtrack(stack)
   329→
   330→            elif opcode == Op.LINE_START:
   331→                if sp != 0:
   332→                    if not stack:
   333→                        return None
   334→                    pc, sp, captures, registers = self._backtrack(stack)
   335→                    continue
   336→                pc += 1
   337→
   338→            elif opcode == Op.LINE_START_M:
   339→                if sp != 0 and (sp >= len(string) or string[sp - 1] != '\n'):
   340→                    if not stack:
   341→                        return None
   342→                    pc, sp, captures, registers = self._backtrack(stack)
   343→                    continue
   344→                pc += 1
   345→
   346→            elif opcode == Op.LINE_END:
   347→                if sp != len(string):
   348→                    if not stack:
   349→                        return None
   350→                    pc, sp, captures, registers = self._backtrack(stack)
   351→                    continue
   352→                pc += 1
   353→
   354→            elif opcode == Op.LINE_END_M:
   355→                if sp != len(string) and string[sp] != '\n':
   356→                    if not stack:
   357→                        return None
   358→                    pc, sp, captures, registers = self._backtrack(stack)
   359→                    continue
   360→                pc += 1
   361→
   362→            elif opcode == Op.WORD_BOUNDARY:
   363→                at_boundary = self._is_word_boundary(string, sp)
   364→                if not at_boundary:
   365→                    if not stack:
   366→                        return None
   367→                    pc, sp, captures, registers = self._backtrack(stack)
   368→                    continue
   369→                pc += 1
   370→
   371→            elif opcode == Op.NOT_WORD_BOUNDARY:
   372→                at_boundary = self._is_word_boundary(string, sp)
   373→                if at_boundary:
   374→                    if not stack:
   375→                        return None
   376→                    pc, sp, captures, registers = self._backtrack(stack)
   377→                    continue
   378→                pc += 1
   379→
   380→            elif opcode == Op.JUMP:
   381→                pc = instr[1]
   382→
   383→            elif opcode == Op.SPLIT_FIRST:
   384→                # Try current path first, backup alternative
   385→                alt_pc = instr[1]
   386→                # Save state for backtracking
   387→                stack.append((
   388→                    alt_pc,
   389→                    sp,
   390→                    [c.copy() for c in captures],
   391→                    registers.copy()
   392→                ))
   393→                pc += 1
   394→
   395→            elif opcode == Op.SPLIT_NEXT:
   396→                # Try alternative first, backup current
   397→                alt_pc = instr[1]
   398→                # Save state for backtracking to continue after this
   399→                stack.append((
   400→                    pc + 1,
   401→                    sp,
   402→                    [c.copy() for c in captures],
   403→                    registers.copy()
   404→                ))
   405→                pc = alt_pc
   406→
   407→            elif opcode == Op.SAVE_START:
   408→                group_idx = instr[1]
   409→                if group_idx < len(captures):
   410→                    captures[group_idx][0] = sp
   411→                pc += 1
   412→
   413→            elif opcode == Op.SAVE_END:
   414→                group_idx = instr[1]
   415→                if group_idx < len(captures):
   416→                    captures[group_idx][1] = sp
   417→                pc += 1
   418→
   419→            elif opcode == Op.SAVE_RESET:
   420→                start_idx = instr[1]
   421→                end_idx = instr[2]
   422→                for i in range(start_idx, end_idx + 1):
   423→                    if i < len(captures):
   424→                        captures[i] = [-1, -1]
   425→                pc += 1
   426→
   427→            elif opcode == Op.BACKREF:
   428→                group_idx = instr[1]
   429→                if group_idx >= len(captures):
   430→                    if not stack:
   431→                        return None
   432→                    pc, sp, captures, registers = self._backtrack(stack)
   433→                    continue
   434→
   435→                start, end = captures[group_idx]
   436→                if start == -1 or end == -1:
   437→                    # Unset capture - matches empty
   438→                    pc += 1
   439→                    continue
   440→
   441→                captured = string[start:end]
   442→                if sp + len(captured) > len(string):
   443→                    if not stack:
   444→                        return None
   445→                    pc, sp, captures, registers = self._backtrack(stack)
   446→                    continue
   447→
   448→                if string[sp:sp + len(captured)] == captured:
   449→                    sp += len(captured)
   450→                    pc += 1
   451→                else:
   452→                    if not stack:
   453→                        return None
   454→                    pc, sp, captures, registers = self._backtrack(stack)
   455→
   456→            elif opcode == Op.BACKREF_I:
   457→                group_idx = instr[1]
   458→                if group_idx >= len(captures):
   459→                    if not stack:
   460→                        return None
   461→                    pc, sp, captures, registers = self._backtrack(stack)
   462→                    continue
   463→
   464→                start, end = captures[group_idx]
   465→                if start == -1 or end == -1:
   466→                    pc += 1
   467→                    continue
   468→
   469→                captured = string[start:end]
   470→                if sp + len(captured) > len(string):
   471→                    if not stack:
   472→                        return None
   473→                    pc, sp, captures, registers = self._backtrack(stack)
   474→                    continue
   475→
   476→                if string[sp:sp + len(captured)].lower() == captured.lower():
   477→                    sp += len(captured)
   478→                    pc += 1
   479→                else:
   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
   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:
   560→                        return None
   561→                    pc, sp, captures, registers = self._backtrack(stack)
   562→
   563→            elif opcode == Op.LOOKBEHIND_END:
   564→                return MatchResult([], 0, "")  # Special marker
   565→
   566→            elif opcode == Op.SET_POS:
   567→                reg_idx = instr[1]
   568→                while len(registers) <= reg_idx:
   569→                    registers.append(-1)
   570→                registers[reg_idx] = sp
   571→                pc += 1
   572→
   573→            elif opcode == Op.CHECK_ADVANCE:
   574→                reg_idx = instr[1]
   575→                if reg_idx < len(registers) and registers[reg_idx] == sp:
   576→                    # Position didn't advance - fail to prevent infinite loop
   577→                    if not stack:
   578→                        return None
   579→                    pc, sp, captures, registers = self._backtrack(stack)
   580→                    continue
   581→                pc += 1
   582→
   583→            elif opcode == Op.MATCH:
   584→                # Successful match!
   585→                groups = []
   586→                for start, end in captures:
   587→                    if start == -1 or end == -1:
   588→                        groups.append(None)
   589→                    else:
   590→                        groups.append(string[start:end])
   591→                return MatchResult(groups, captures[0][0], string)
   592→
   593→            else:
   594→                raise RuntimeError(f"Unknown opcode: {opcode}")
   595→
   596→    def _backtrack(self, stack: List[Tuple]) -> Tuple:
   597→        """Pop and return state from backtrack stack."""
   598→        return stack.pop()
   599→
   600→    def _is_word_boundary(self, string: str, pos: int) -> bool:
   601→        """Check if position is at a word boundary."""
   602→        def is_word_char(ch: str) -> bool:
   603→            return ch.isalnum() or ch == '_'
   604→
   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→
   707→        Lookbehind matches if the pattern matches text ending at end_pos.
   708→        We try all possible start positions backwards from end_pos.
   709→        """
   710→        # Try all possible starting positions from 0 to end_pos
   711→        # We want the pattern to match and end exactly at end_pos
   712→        for start_pos in range(end_pos, -1, -1):
   713→            result = self._try_lookbehind_at(string, start_pos, end_pos, start_pc, end_pc)
   714→            if result:
   715→                return True
   716→        return False
   717→
   718→    def _try_lookbehind_at(self, string: str, start_pos: int, end_pos: int,
   719→                           start_pc: int, end_pc: int) -> bool:
   720→        """Try to match lookbehind pattern from start_pos, checking it ends at end_pos."""
   721→        pc = start_pc
   722→        sp = start_pos
   723→        captures = [[-1, -1] for _ in range(self.capture_count)]
   724→        registers: List[int] = []
   725→        stack: List[Tuple] = []
   726→        step_count = 0
   727→
   728→        while True:
   729→            step_count += 1
   730→            if step_count % self.poll_interval == 0:
   731→                if self.poll_callback and self.poll_callback():
   732→                    raise RegexTimeoutError("Regex execution timed out")
   733→
   734→            if len(stack) > self.stack_limit:
   735→                raise RegexStackOverflow("Regex stack overflow")
   736→
   737→            if pc >= end_pc:
   738→                return False
   739→
   740→            instr = self.bytecode[pc]
   741→            opcode = instr[0]
   742→
   743→            if opcode == Op.LOOKBEHIND_END:
   744→                # Check if we ended exactly at the target position
   745→                return sp == end_pos
   746→
   747→            if opcode == Op.CHAR:
   748→                char_code = instr[1]
   749→                if sp >= len(string):
   750→                    if not stack:
   751→                        return False
   752→                    pc, sp, captures, registers = stack.pop()
   753→                    continue
   754→                ch = string[sp]
   755→                if self.ignorecase:
   756→                    match = ord(ch.lower()) == char_code or ord(ch.upper()) == char_code
   757→                else:
   758→                    match = ord(ch) == char_code
   759→                if match:
   760→                    sp += 1
   761→                    pc += 1
   762→                else:
   763→                    if not stack:
   764→                        return False
   765→                    pc, sp, captures, registers = stack.pop()
   766→
   767→            elif opcode == Op.DOT:
   768→                if sp >= len(string) or string[sp] == '\n':
   769→                    if not stack:
   770→                        return False
   771→                    pc, sp, captures, registers = stack.pop()
   772→                    continue
   773→                sp += 1
   774→                pc += 1
   775→
   776→            elif opcode == Op.DIGIT:
   777→                if sp >= len(string) or not string[sp].isdigit():
   778→                    if not stack:
   779→                        return False
   780→                    pc, sp, captures, registers = stack.pop()
   781→                    continue
   782→                sp += 1
   783→                pc += 1
   784→
   785→            elif opcode == Op.WORD:
   786→                if sp >= len(string):
   787→                    if not stack:
   788→                        return False
   789→                    pc, sp, captures, registers = stack.pop()
   790→                    continue
   791→                ch = string[sp]
   792→                if ch.isalnum() or ch == '_':
   793→                    sp += 1
   794→                    pc += 1
   795→                else:
   796→                    if not stack:
   797→                        return False
   798→                    pc, sp, captures, registers = stack.pop()
   799→
   800→            elif opcode == Op.SPLIT_FIRST:
   801→                alt_pc = instr[1]
   802→                stack.append((alt_pc, sp, [c.copy() for c in captures], registers.copy()))
   803→                pc += 1
   804→
   805→            elif opcode == Op.SPLIT_NEXT:
   806→                alt_pc = instr[1]
   807→                stack.append((pc + 1, sp, [c.copy() for c in captures], registers.copy()))
   808→                pc = alt_pc
   809→
   810→            elif opcode == Op.JUMP:
   811→                pc = instr[1]
   812→
   813→            elif opcode == Op.MATCH:
   814→                # Check if we ended exactly at the target position
   815→                return sp == end_pos
   816→
   817→            else:
   818→                # Handle other opcodes - advance pc
   819→                pc += 1
   820→

<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→Main regex module - public interface.
     3→
     4→Provides JavaScript-compatible RegExp with ReDoS protection.
     5→"""
     6→
     7→from typing import Optional, Callable, List
     8→from .parser import RegexParser, RegExpError
     9→from .compiler import RegexCompiler
    10→from .vm import RegexVM, MatchResult, RegexTimeoutError, RegexStackOverflow
    11→
    12→
    13→__all__ = ['RegExp', 'RegExpError', 'match', 'search', 'test',
    14→           'RegexTimeoutError', 'RegexStackOverflow', 'MatchResult']
    15→
    16→
    17→class RegExp:
    18→    """
    19→    JavaScript-compatible regular expression object.
    20→
    21→    Provides safe regex matching with ReDoS protection.
    22→    """
    23→
    24→    def __init__(
    25→        self,
    26→        pattern: str,
    27→        flags: str = "",
    28→        poll_callback: Optional[Callable[[], bool]] = None,
    29→        stack_limit: int = 10000,
    30→        poll_interval: int = 100
    31→    ):
    32→        """
    33→        Create a new RegExp.
    34→
    35→        Args:
    36→            pattern: The regex pattern string
    37→            flags: Optional flags (g, i, m, s, u, y)
    38→            poll_callback: Called periodically; return True to abort
    39→            stack_limit: Maximum backtrack stack size
    40→            poll_interval: Steps between poll calls
    41→        """
    42→        self.source = pattern
    43→        self.flags = flags
    44→        self._global = 'g' in flags
    45→        self._ignore_case = 'i' in flags
    46→        self._multiline = 'm' in flags
    47→        self._dotall = 's' in flags
    48→        self._unicode = 'u' in flags
    49→        self._sticky = 'y' in flags
    50→        self.lastIndex = 0
    51→
    52→        self._poll_callback = poll_callback
    53→        self._stack_limit = stack_limit
    54→        self._poll_interval = poll_interval
    55→
    56→        # Parse and compile
    57→        try:
    58→            parser = RegexParser(pattern, flags)
    59→            self._ast, self._capture_count = parser.parse()
    60→
    61→            compiler = RegexCompiler(flags)
    62→            self._bytecode = compiler.compile(self._ast, self._capture_count)
    63→            self._compiled = True
    64→        except Exception as e:
    65→            if isinstance(e, RegExpError):
    66→                raise
    67→            raise RegExpError(f"Failed to compile regex: {e}")
    68→
    69→    @property
    70→    def global_(self):
    71→        return self._global
    72→
    73→    @property
    74→    def ignoreCase(self):
    75→        return self._ignore_case
    76→
    77→    @property
    78→    def multiline(self):
    79→        return self._multiline
    80→
    81→    @property
    82→    def dotAll(self):
    83→        return self._dotall
    84→
    85→    @property
    86→    def unicode(self):
    87→        return self._unicode
    88→
    89→    @property
    90→    def sticky(self):
    91→        return self._sticky
    92→
    93→    def _create_vm(self) -> RegexVM:
    94→        """Create a new VM instance."""
    95→        return RegexVM(
    96→            self._bytecode,
    97→            self._capture_count,
    98→            self.flags,
    99→            self._poll_callback,
   100→            self._stack_limit,
   101→            self._poll_interval
   102→        )
   103→
   104→    def test(self, string: str) -> bool:
   105→        """
   106→        Test if the pattern matches the string.
   107→
   108→        Args:
   109→            string: The string to test
   110→
   111→        Returns:
   112→            True if there's a match, False otherwise
   113→        """
   114→        vm = self._create_vm()
   115→
   116→        if self._sticky:
   117→            result = vm.match(string, self.lastIndex)
   118→            if result:
   119→                if self._global:
   120→                    self.lastIndex = result.index + len(result[0]) if result[0] else result.index
   121→                return True
   122→            if self._global:
   123→                self.lastIndex = 0
   124→            return False
   125→
   126→        result = vm.search(string, self.lastIndex if self._global else 0)
   127→        if result:
   128→            if self._global:
   129→                self.lastIndex = result.index + len(result[0]) if result[0] else result.index + 1
   130→            return True
   131→
   132→        if self._global:
   133→            self.lastIndex = 0
   134→        return False
   135→
   136→    def exec(self, string: str) -> Optional[MatchResult]:
   137→        """
   138→        Execute a search for a match.
   139→
   140→        Args:
   141→            string: The string to search
   142→
   143→        Returns:
   144→            Match array or None if no match
   145→        """
   146→        vm = self._create_vm()
   147→
   148→        if self._sticky:
   149→            result = vm.match(string, self.lastIndex)
   150→            if result:
   151→                if self._global or self._sticky:
   152→                    self.lastIndex = result.index + len(result[0]) if result[0] else result.index
   153→                return result
   154→            if self._global or self._sticky:
   155→                self.lastIndex = 0
   156→            return None
   157→
   158→        start_pos = self.lastIndex if self._global else 0
   159→        result = vm.search(string, start_pos)
   160→
   161→        if result:
   162→            if self._global:
   163→                self.lastIndex = result.index + len(result[0]) if result[0] else result.index + 1
   164→            return result
   165→
   166→        if self._global:
   167→            self.lastIndex = 0
   168→        return None
   169→
   170→
   171→def match(pattern: str, string: str, flags: str = "") -> Optional[MatchResult]:
   172→    """
   173→    Convenience function to match pattern against string.
   174→
   175→    Args:
   176→        pattern: The regex pattern
   177→        string: The string to match
   178→        flags: Optional flags
   179→
   180→    Returns:
   181→        Match result or None
   182→    """
   183→    return RegExp(pattern, flags).exec(string)
   184→
   185→
   186→def search(pattern: str, string: str, flags: str = "") -> Optional[MatchResult]:
   187→    """
   188→    Search for pattern in string.
   189→
   190→    Args:
   191→        pattern: The regex pattern
   192→        string: The string to search
   193→        flags: Optional flags
   194→
   195→    Returns:
   196→        Match result or None
   197→    """
   198→    return RegExp(pattern, flags).exec(string)
   199→
   200→
   201→def test(pattern: str, string: str, flags: str = "") -> bool:
   202→    """
   203→    Test if pattern matches string.
   204→
   205→    Args:
   206→        pattern: The regex pattern
   207→        string: The string to test
   208→        flags: Optional flags
   209→
   210→    Returns:
   211→        True if matches, False otherwise
   212→    """
   213→    return RegExp(pattern, flags).test(string)
   214→

<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>

83-
84-            if ch == "\\":
85-                # Escape sequence
86:                escape = self._advance()
87:                if escape == "n":
88-                    result.append("\n")
89:                elif escape == "r":
90-                    result.append("\r")
91:                elif escape == "t":
92-                    result.append("\t")
93:                elif escape == "\\":
94-                    result.append("\\")
95:                elif escape == "'":
96-                    result.append("'")
97:                elif escape == '"':
98-                    result.append('"')
99:                elif escape == "0":
100-                    result.append("\0")
101:                elif escape == "x":
102:                    # Hex escape \xNN
103-                    hex_chars = self._advance() + self._advance()
104-                    try:
105-                        result.append(chr(int(hex_chars, 16)))
106-                    except ValueError:
107-                        raise JSSyntaxError(
108:                            f"Invalid hex escape: \\x{hex_chars}",
109-                            self.line,
110-                            self.column,
111-                        )
112:                elif escape == "u":
113:                    # Unicode escape \uNNNN or \u{N...}
114-                    if self._current() == "{":
115-                        self._advance()  # {
116-                        hex_chars = ""
117-                        while self._current() and self._current() != "}":
118-                            hex_chars += self._advance()
--
125-                        result.append(chr(int(hex_chars, 16)))
126-                    except ValueError:
127-                        raise JSSyntaxError(
128:                            f"Invalid unicode escape: \\u{hex_chars}",
129-                            self.line,
130-                            self.column,
131-                        )
132-                else:
133:                    # Unknown escape - just use the character
134:                    result.append(escape)
135-            elif ch == "\n":
136-                raise JSSyntaxError("Unterminated string literal", self.line, self.column)
137-            else:
138-                result.append(ch)
139-