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Commit | Line | Data |
---|---|---|
19a03940 | 1 | import collections |
2 | import contextlib | |
8f53dc44 | 3 | import itertools |
825abb81 | 4 | import json |
8f53dc44 | 5 | import math |
9e3f1991 | 6 | import operator |
2b25cb5d PH |
7 | import re |
8 | ||
8f53dc44 | 9 | from .utils import ( |
10 | NO_DEFAULT, | |
11 | ExtractorError, | |
12 | js_to_json, | |
13 | remove_quotes, | |
14 | truncate_string, | |
15 | unified_timestamp, | |
16 | write_string, | |
17 | ) | |
2b25cb5d | 18 | |
be13a6e5 | 19 | |
20 | def _js_bit_op(op): | |
21 | def wrapped(a, b): | |
22 | def zeroise(x): | |
23 | return 0 if x in (None, JS_Undefined) else x | |
24 | return op(zeroise(a), zeroise(b)) | |
25 | ||
26 | return wrapped | |
27 | ||
28 | ||
29 | def _js_arith_op(op): | |
30 | ||
31 | def wrapped(a, b): | |
32 | if JS_Undefined in (a, b): | |
33 | return float('nan') | |
34 | return op(a or 0, b or 0) | |
35 | ||
36 | return wrapped | |
37 | ||
38 | ||
39 | def _js_div(a, b): | |
40 | if JS_Undefined in (a, b) or not (a and b): | |
41 | return float('nan') | |
42 | return (a or 0) / b if b else float('inf') | |
43 | ||
44 | ||
45 | def _js_mod(a, b): | |
46 | if JS_Undefined in (a, b) or not b: | |
47 | return float('nan') | |
48 | return (a or 0) % b | |
49 | ||
50 | ||
51 | def _js_exp(a, b): | |
52 | if not b: | |
53 | return 1 # even 0 ** 0 !! | |
54 | elif JS_Undefined in (a, b): | |
55 | return float('nan') | |
56 | return (a or 0) ** b | |
57 | ||
58 | ||
59 | def _js_eq_op(op): | |
60 | ||
61 | def wrapped(a, b): | |
62 | if {a, b} <= {None, JS_Undefined}: | |
63 | return op(a, a) | |
64 | return op(a, b) | |
65 | ||
66 | return wrapped | |
67 | ||
68 | ||
69 | def _js_comp_op(op): | |
70 | ||
71 | def wrapped(a, b): | |
72 | if JS_Undefined in (a, b): | |
73 | return False | |
74 | return op(a or 0, b or 0) | |
75 | ||
76 | return wrapped | |
77 | ||
78 | ||
79 | def _js_ternary(cndn, if_true=True, if_false=False): | |
80 | """Simulate JS's ternary operator (cndn?if_true:if_false)""" | |
81 | if cndn in (False, None, 0, '', JS_Undefined): | |
82 | return if_false | |
83 | with contextlib.suppress(TypeError): | |
84 | if math.isnan(cndn): # NB: NaN cannot be checked by membership | |
85 | return if_false | |
86 | return if_true | |
87 | ||
49b4ceae | 88 | |
89 | # Ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence | |
8f53dc44 | 90 | _OPERATORS = { # None => Defined in JSInterpreter._operator |
91 | '?': None, | |
be13a6e5 | 92 | '??': None, |
8f53dc44 | 93 | '||': None, |
94 | '&&': None, | |
be13a6e5 | 95 | |
96 | '|': _js_bit_op(operator.or_), | |
97 | '^': _js_bit_op(operator.xor), | |
98 | '&': _js_bit_op(operator.and_), | |
8f53dc44 | 99 | |
49b4ceae | 100 | '===': operator.is_, |
101 | '!==': operator.is_not, | |
164b03c4 | 102 | '==': _js_eq_op(operator.eq), |
be13a6e5 | 103 | '!=': _js_eq_op(operator.ne), |
8f53dc44 | 104 | |
be13a6e5 | 105 | '<=': _js_comp_op(operator.le), |
106 | '>=': _js_comp_op(operator.ge), | |
107 | '<': _js_comp_op(operator.lt), | |
108 | '>': _js_comp_op(operator.gt), | |
8f53dc44 | 109 | |
be13a6e5 | 110 | '>>': _js_bit_op(operator.rshift), |
111 | '<<': _js_bit_op(operator.lshift), | |
49b4ceae | 112 | |
be13a6e5 | 113 | '+': _js_arith_op(operator.add), |
114 | '-': _js_arith_op(operator.sub), | |
8f53dc44 | 115 | |
be13a6e5 | 116 | '*': _js_arith_op(operator.mul), |
117 | '/': _js_div, | |
118 | '%': _js_mod, | |
119 | '**': _js_exp, | |
230d5c82 | 120 | } |
9e3f1991 | 121 | |
49b4ceae | 122 | _COMP_OPERATORS = {'===', '!==', '==', '!=', '<=', '>=', '<', '>'} |
123 | ||
be13a6e5 | 124 | _NAME_RE = r'[a-zA-Z_$][\w$]*' |
125 | _MATCHING_PARENS = dict(zip(*zip('()', '{}', '[]'))) | |
f6ca640b | 126 | _QUOTES = '\'"/' |
06dfe0a0 | 127 | |
2b25cb5d | 128 | |
be13a6e5 | 129 | class JS_Undefined: |
130 | pass | |
8f53dc44 | 131 | |
132 | ||
404f611f | 133 | class JS_Break(ExtractorError): |
134 | def __init__(self): | |
135 | ExtractorError.__init__(self, 'Invalid break') | |
136 | ||
137 | ||
138 | class JS_Continue(ExtractorError): | |
139 | def __init__(self): | |
140 | ExtractorError.__init__(self, 'Invalid continue') | |
141 | ||
142 | ||
f6ca640b | 143 | class JS_Throw(ExtractorError): |
144 | def __init__(self, e): | |
145 | self.error = e | |
146 | ExtractorError.__init__(self, f'Uncaught exception {e}') | |
147 | ||
148 | ||
19a03940 | 149 | class LocalNameSpace(collections.ChainMap): |
404f611f | 150 | def __setitem__(self, key, value): |
19a03940 | 151 | for scope in self.maps: |
404f611f | 152 | if key in scope: |
153 | scope[key] = value | |
19a03940 | 154 | return |
155 | self.maps[0][key] = value | |
404f611f | 156 | |
157 | def __delitem__(self, key): | |
158 | raise NotImplementedError('Deleting is not supported') | |
159 | ||
404f611f | 160 | |
8f53dc44 | 161 | class Debugger: |
162 | import sys | |
49b4ceae | 163 | ENABLED = False and 'pytest' in sys.modules |
8f53dc44 | 164 | |
165 | @staticmethod | |
166 | def write(*args, level=100): | |
167 | write_string(f'[debug] JS: {" " * (100 - level)}' | |
168 | f'{" ".join(truncate_string(str(x), 50, 50) for x in args)}\n') | |
169 | ||
170 | @classmethod | |
171 | def wrap_interpreter(cls, f): | |
172 | def interpret_statement(self, stmt, local_vars, allow_recursion, *args, **kwargs): | |
173 | if cls.ENABLED and stmt.strip(): | |
174 | cls.write(stmt, level=allow_recursion) | |
175 | ret, should_ret = f(self, stmt, local_vars, allow_recursion, *args, **kwargs) | |
176 | if cls.ENABLED and stmt.strip(): | |
177 | cls.write(['->', '=>'][should_ret], repr(ret), '<-|', stmt, level=allow_recursion) | |
178 | return ret, should_ret | |
179 | return interpret_statement | |
180 | ||
181 | ||
86e5f3ed | 182 | class JSInterpreter: |
230d5c82 | 183 | __named_object_counter = 0 |
184 | ||
be13a6e5 | 185 | _RE_FLAGS = { |
186 | # special knowledge: Python's re flags are bitmask values, current max 128 | |
187 | # invent new bitmask values well above that for literal parsing | |
188 | # TODO: new pattern class to execute matches with these flags | |
189 | 'd': 1024, # Generate indices for substring matches | |
190 | 'g': 2048, # Global search | |
191 | 'i': re.I, # Case-insensitive search | |
192 | 'm': re.M, # Multi-line search | |
193 | 's': re.S, # Allows . to match newline characters | |
194 | 'u': re.U, # Treat a pattern as a sequence of unicode code points | |
195 | 'y': 4096, # Perform a "sticky" search that matches starting at the current position in the target string | |
196 | } | |
197 | ||
198 | _EXC_NAME = '__yt_dlp_exception__' | |
199 | ||
9e3f1991 | 200 | def __init__(self, code, objects=None): |
230d5c82 | 201 | self.code, self._functions = code, {} |
202 | self._objects = {} if objects is None else objects | |
404f611f | 203 | |
a1c5bd82 | 204 | class Exception(ExtractorError): |
205 | def __init__(self, msg, expr=None, *args, **kwargs): | |
206 | if expr is not None: | |
8f53dc44 | 207 | msg = f'{msg.rstrip()} in: {truncate_string(expr, 50, 50)}' |
a1c5bd82 | 208 | super().__init__(msg, *args, **kwargs) |
209 | ||
404f611f | 210 | def _named_object(self, namespace, obj): |
211 | self.__named_object_counter += 1 | |
212 | name = f'__yt_dlp_jsinterp_obj{self.__named_object_counter}' | |
213 | namespace[name] = obj | |
214 | return name | |
215 | ||
be13a6e5 | 216 | @classmethod |
217 | def _regex_flags(cls, expr): | |
218 | flags = 0 | |
219 | if not expr: | |
220 | return flags, expr | |
221 | for idx, ch in enumerate(expr): | |
222 | if ch not in cls._RE_FLAGS: | |
223 | break | |
224 | flags |= cls._RE_FLAGS[ch] | |
225 | return flags, expr[idx + 1:] | |
226 | ||
404f611f | 227 | @staticmethod |
e75bb0d6 | 228 | def _separate(expr, delim=',', max_split=None): |
f6ca640b | 229 | OP_CHARS = '+-*/%&|^=<>!,;' |
404f611f | 230 | if not expr: |
231 | return | |
06dfe0a0 | 232 | counters = {k: 0 for k in _MATCHING_PARENS.values()} |
233 | start, splits, pos, delim_len = 0, 0, 0, len(delim) - 1 | |
f6ca640b | 234 | in_quote, escaping, after_op, in_regex_char_group = None, False, True, False |
404f611f | 235 | for idx, char in enumerate(expr): |
8f53dc44 | 236 | if not in_quote and char in _MATCHING_PARENS: |
06dfe0a0 | 237 | counters[_MATCHING_PARENS[char]] += 1 |
8f53dc44 | 238 | elif not in_quote and char in counters: |
06dfe0a0 | 239 | counters[char] -= 1 |
64fa820c | 240 | elif not escaping and char in _QUOTES and in_quote in (char, None): |
f6ca640b | 241 | if in_quote or after_op or char != '/': |
242 | in_quote = None if in_quote and not in_regex_char_group else char | |
243 | elif in_quote == '/' and char in '[]': | |
244 | in_regex_char_group = char == '[' | |
64fa820c | 245 | escaping = not escaping and in_quote and char == '\\' |
f6ca640b | 246 | after_op = not in_quote and char in OP_CHARS or (char == ' ' and after_op) |
64fa820c | 247 | |
248 | if char != delim[pos] or any(counters.values()) or in_quote: | |
404f611f | 249 | pos = 0 |
06dfe0a0 | 250 | continue |
251 | elif pos != delim_len: | |
252 | pos += 1 | |
253 | continue | |
254 | yield expr[start: idx - delim_len] | |
255 | start, pos = idx + 1, 0 | |
256 | splits += 1 | |
257 | if max_split and splits >= max_split: | |
258 | break | |
404f611f | 259 | yield expr[start:] |
260 | ||
230d5c82 | 261 | @classmethod |
262 | def _separate_at_paren(cls, expr, delim): | |
263 | separated = list(cls._separate(expr, delim, 1)) | |
e75bb0d6 | 264 | if len(separated) < 2: |
a1c5bd82 | 265 | raise cls.Exception(f'No terminating paren {delim}', expr) |
e75bb0d6 | 266 | return separated[0][1:].strip(), separated[1].strip() |
9e3f1991 | 267 | |
8f53dc44 | 268 | def _operator(self, op, left_val, right_expr, expr, local_vars, allow_recursion): |
269 | if op in ('||', '&&'): | |
be13a6e5 | 270 | if (op == '&&') ^ _js_ternary(left_val): |
8f53dc44 | 271 | return left_val # short circuiting |
be13a6e5 | 272 | elif op == '??': |
273 | if left_val not in (None, JS_Undefined): | |
274 | return left_val | |
8f53dc44 | 275 | elif op == '?': |
be13a6e5 | 276 | right_expr = _js_ternary(left_val, *self._separate(right_expr, ':', 1)) |
8f53dc44 | 277 | |
278 | right_val = self.interpret_expression(right_expr, local_vars, allow_recursion) | |
279 | if not _OPERATORS.get(op): | |
280 | return right_val | |
281 | ||
282 | try: | |
283 | return _OPERATORS[op](left_val, right_val) | |
284 | except Exception as e: | |
285 | raise self.Exception(f'Failed to evaluate {left_val!r} {op} {right_val!r}', expr, cause=e) | |
286 | ||
be13a6e5 | 287 | def _index(self, obj, idx, allow_undefined=False): |
8f53dc44 | 288 | if idx == 'length': |
289 | return len(obj) | |
290 | try: | |
291 | return obj[int(idx)] if isinstance(obj, list) else obj[idx] | |
292 | except Exception as e: | |
be13a6e5 | 293 | if allow_undefined: |
294 | return JS_Undefined | |
8f53dc44 | 295 | raise self.Exception(f'Cannot get index {idx}', repr(obj), cause=e) |
296 | ||
297 | def _dump(self, obj, namespace): | |
298 | try: | |
299 | return json.dumps(obj) | |
300 | except TypeError: | |
301 | return self._named_object(namespace, obj) | |
302 | ||
303 | @Debugger.wrap_interpreter | |
9e3f1991 | 304 | def interpret_statement(self, stmt, local_vars, allow_recursion=100): |
2b25cb5d | 305 | if allow_recursion < 0: |
a1c5bd82 | 306 | raise self.Exception('Recursion limit reached') |
8f53dc44 | 307 | allow_recursion -= 1 |
2b25cb5d | 308 | |
8f53dc44 | 309 | should_return = False |
230d5c82 | 310 | sub_statements = list(self._separate(stmt, ';')) or [''] |
8f53dc44 | 311 | expr = stmt = sub_statements.pop().strip() |
230d5c82 | 312 | |
404f611f | 313 | for sub_stmt in sub_statements: |
8f53dc44 | 314 | ret, should_return = self.interpret_statement(sub_stmt, local_vars, allow_recursion) |
315 | if should_return: | |
316 | return ret, should_return | |
404f611f | 317 | |
f6ca640b | 318 | m = re.match(r'(?P<var>(?:var|const|let)\s)|return(?:\s+|(?=["\'])|$)|(?P<throw>throw\s+)', stmt) |
8f53dc44 | 319 | if m: |
320 | expr = stmt[len(m.group(0)):].strip() | |
f6ca640b | 321 | if m.group('throw'): |
322 | raise JS_Throw(self.interpret_expression(expr, local_vars, allow_recursion)) | |
8f53dc44 | 323 | should_return = not m.group('var') |
230d5c82 | 324 | if not expr: |
8f53dc44 | 325 | return None, should_return |
326 | ||
327 | if expr[0] in _QUOTES: | |
328 | inner, outer = self._separate(expr, expr[0], 1) | |
f6ca640b | 329 | if expr[0] == '/': |
be13a6e5 | 330 | flags, outer = self._regex_flags(outer) |
331 | inner = re.compile(inner[1:], flags=flags) | |
f6ca640b | 332 | else: |
333 | inner = json.loads(js_to_json(f'{inner}{expr[0]}', strict=True)) | |
8f53dc44 | 334 | if not outer: |
335 | return inner, should_return | |
336 | expr = self._named_object(local_vars, inner) + outer | |
337 | ||
338 | if expr.startswith('new '): | |
339 | obj = expr[4:] | |
340 | if obj.startswith('Date('): | |
341 | left, right = self._separate_at_paren(obj[4:], ')') | |
49b4ceae | 342 | expr = unified_timestamp( |
343 | self.interpret_expression(left, local_vars, allow_recursion), False) | |
8f53dc44 | 344 | if not expr: |
345 | raise self.Exception(f'Failed to parse date {left!r}', expr) | |
346 | expr = self._dump(int(expr * 1000), local_vars) + right | |
347 | else: | |
348 | raise self.Exception(f'Unsupported object {obj}', expr) | |
9e3f1991 | 349 | |
49b4ceae | 350 | if expr.startswith('void '): |
351 | left = self.interpret_expression(expr[5:], local_vars, allow_recursion) | |
352 | return None, should_return | |
353 | ||
404f611f | 354 | if expr.startswith('{'): |
e75bb0d6 | 355 | inner, outer = self._separate_at_paren(expr, '}') |
be13a6e5 | 356 | # Look for Map first |
357 | sub_expressions = [list(self._separate(sub_expr.strip(), ':', 1)) for sub_expr in self._separate(inner)] | |
358 | if all(len(sub_expr) == 2 for sub_expr in sub_expressions): | |
359 | def dict_item(key, val): | |
360 | val = self.interpret_expression(val, local_vars, allow_recursion) | |
361 | if re.match(_NAME_RE, key): | |
362 | return key, val | |
363 | return self.interpret_expression(key, local_vars, allow_recursion), val | |
364 | ||
365 | return dict(dict_item(k, v) for k, v in sub_expressions), should_return | |
366 | ||
8f53dc44 | 367 | inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion) |
404f611f | 368 | if not outer or should_abort: |
8f53dc44 | 369 | return inner, should_abort or should_return |
404f611f | 370 | else: |
8f53dc44 | 371 | expr = self._dump(inner, local_vars) + outer |
404f611f | 372 | |
9e3f1991 | 373 | if expr.startswith('('): |
e75bb0d6 | 374 | inner, outer = self._separate_at_paren(expr, ')') |
8f53dc44 | 375 | inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion) |
376 | if not outer or should_abort: | |
377 | return inner, should_abort or should_return | |
404f611f | 378 | else: |
8f53dc44 | 379 | expr = self._dump(inner, local_vars) + outer |
404f611f | 380 | |
381 | if expr.startswith('['): | |
e75bb0d6 | 382 | inner, outer = self._separate_at_paren(expr, ']') |
404f611f | 383 | name = self._named_object(local_vars, [ |
384 | self.interpret_expression(item, local_vars, allow_recursion) | |
e75bb0d6 | 385 | for item in self._separate(inner)]) |
404f611f | 386 | expr = name + outer |
387 | ||
f6ca640b | 388 | m = re.match(rf'''(?x) |
389 | (?P<try>try|finally)\s*| | |
390 | (?P<catch>catch\s*(?P<err>\(\s*{_NAME_RE}\s*\)))| | |
391 | (?P<switch>switch)\s*\(| | |
392 | (?P<for>for)\s*\(|''', expr) | |
230d5c82 | 393 | if m and m.group('try'): |
404f611f | 394 | if expr[m.end()] == '{': |
e75bb0d6 | 395 | try_expr, expr = self._separate_at_paren(expr[m.end():], '}') |
404f611f | 396 | else: |
397 | try_expr, expr = expr[m.end() - 1:], '' | |
f6ca640b | 398 | try: |
399 | ret, should_abort = self.interpret_statement(try_expr, local_vars, allow_recursion) | |
400 | if should_abort: | |
401 | return ret, True | |
402 | except JS_Throw as e: | |
be13a6e5 | 403 | local_vars[self._EXC_NAME] = e.error |
f6ca640b | 404 | except Exception as e: |
405 | # XXX: This works for now, but makes debugging future issues very hard | |
be13a6e5 | 406 | local_vars[self._EXC_NAME] = e |
8f53dc44 | 407 | ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion) |
408 | return ret, should_abort or should_return | |
404f611f | 409 | |
230d5c82 | 410 | elif m and m.group('catch'): |
f6ca640b | 411 | catch_expr, expr = self._separate_at_paren(expr[m.end():], '}') |
be13a6e5 | 412 | if self._EXC_NAME in local_vars: |
413 | catch_vars = local_vars.new_child({m.group('err'): local_vars.pop(self._EXC_NAME)}) | |
f6ca640b | 414 | ret, should_abort = self.interpret_statement(catch_expr, catch_vars, allow_recursion) |
415 | if should_abort: | |
416 | return ret, True | |
417 | ||
8f53dc44 | 418 | ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion) |
419 | return ret, should_abort or should_return | |
404f611f | 420 | |
230d5c82 | 421 | elif m and m.group('for'): |
e75bb0d6 | 422 | constructor, remaining = self._separate_at_paren(expr[m.end() - 1:], ')') |
404f611f | 423 | if remaining.startswith('{'): |
e75bb0d6 | 424 | body, expr = self._separate_at_paren(remaining, '}') |
404f611f | 425 | else: |
230d5c82 | 426 | switch_m = re.match(r'switch\s*\(', remaining) # FIXME |
427 | if switch_m: | |
428 | switch_val, remaining = self._separate_at_paren(remaining[switch_m.end() - 1:], ')') | |
e75bb0d6 | 429 | body, expr = self._separate_at_paren(remaining, '}') |
404f611f | 430 | body = 'switch(%s){%s}' % (switch_val, body) |
9e3f1991 | 431 | else: |
404f611f | 432 | body, expr = remaining, '' |
e75bb0d6 | 433 | start, cndn, increment = self._separate(constructor, ';') |
8f53dc44 | 434 | self.interpret_expression(start, local_vars, allow_recursion) |
404f611f | 435 | while True: |
be13a6e5 | 436 | if not _js_ternary(self.interpret_expression(cndn, local_vars, allow_recursion)): |
404f611f | 437 | break |
438 | try: | |
8f53dc44 | 439 | ret, should_abort = self.interpret_statement(body, local_vars, allow_recursion) |
404f611f | 440 | if should_abort: |
8f53dc44 | 441 | return ret, True |
404f611f | 442 | except JS_Break: |
443 | break | |
444 | except JS_Continue: | |
445 | pass | |
8f53dc44 | 446 | self.interpret_expression(increment, local_vars, allow_recursion) |
447 | ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion) | |
448 | return ret, should_abort or should_return | |
404f611f | 449 | |
230d5c82 | 450 | elif m and m.group('switch'): |
e75bb0d6 | 451 | switch_val, remaining = self._separate_at_paren(expr[m.end() - 1:], ')') |
404f611f | 452 | switch_val = self.interpret_expression(switch_val, local_vars, allow_recursion) |
e75bb0d6 | 453 | body, expr = self._separate_at_paren(remaining, '}') |
a1fc7ca0 | 454 | items = body.replace('default:', 'case default:').split('case ')[1:] |
455 | for default in (False, True): | |
456 | matched = False | |
457 | for item in items: | |
86e5f3ed | 458 | case, stmt = (i.strip() for i in self._separate(item, ':', 1)) |
a1fc7ca0 | 459 | if default: |
460 | matched = matched or case == 'default' | |
461 | elif not matched: | |
49b4ceae | 462 | matched = (case != 'default' |
463 | and switch_val == self.interpret_expression(case, local_vars, allow_recursion)) | |
a1fc7ca0 | 464 | if not matched: |
465 | continue | |
404f611f | 466 | try: |
8f53dc44 | 467 | ret, should_abort = self.interpret_statement(stmt, local_vars, allow_recursion) |
404f611f | 468 | if should_abort: |
469 | return ret | |
470 | except JS_Break: | |
9e3f1991 | 471 | break |
a1fc7ca0 | 472 | if matched: |
473 | break | |
8f53dc44 | 474 | ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion) |
475 | return ret, should_abort or should_return | |
404f611f | 476 | |
e75bb0d6 U |
477 | # Comma separated statements |
478 | sub_expressions = list(self._separate(expr)) | |
6d3e7424 | 479 | if len(sub_expressions) > 1: |
480 | for sub_expr in sub_expressions: | |
481 | ret, should_abort = self.interpret_statement(sub_expr, local_vars, allow_recursion) | |
482 | if should_abort: | |
483 | return ret, True | |
484 | return ret, False | |
404f611f | 485 | |
486 | for m in re.finditer(rf'''(?x) | |
487 | (?P<pre_sign>\+\+|--)(?P<var1>{_NAME_RE})| | |
488 | (?P<var2>{_NAME_RE})(?P<post_sign>\+\+|--)''', expr): | |
489 | var = m.group('var1') or m.group('var2') | |
490 | start, end = m.span() | |
491 | sign = m.group('pre_sign') or m.group('post_sign') | |
492 | ret = local_vars[var] | |
493 | local_vars[var] += 1 if sign[0] == '+' else -1 | |
494 | if m.group('pre_sign'): | |
495 | ret = local_vars[var] | |
8f53dc44 | 496 | expr = expr[:start] + self._dump(ret, local_vars) + expr[end:] |
9e3f1991 | 497 | |
230d5c82 | 498 | if not expr: |
8f53dc44 | 499 | return None, should_return |
9e3f1991 | 500 | |
230d5c82 | 501 | m = re.match(fr'''(?x) |
502 | (?P<assign> | |
503 | (?P<out>{_NAME_RE})(?:\[(?P<index>[^\]]+?)\])?\s* | |
49b4ceae | 504 | (?P<op>{"|".join(map(re.escape, set(_OPERATORS) - _COMP_OPERATORS))})? |
be13a6e5 | 505 | =(?!=)(?P<expr>.*)$ |
230d5c82 | 506 | )|(?P<return> |
8f53dc44 | 507 | (?!if|return|true|false|null|undefined)(?P<name>{_NAME_RE})$ |
230d5c82 | 508 | )|(?P<indexing> |
509 | (?P<in>{_NAME_RE})\[(?P<idx>.+)\]$ | |
510 | )|(?P<attribute> | |
be13a6e5 | 511 | (?P<var>{_NAME_RE})(?:(?P<nullish>\?)?\.(?P<member>[^(]+)|\[(?P<member2>[^\]]+)\])\s* |
230d5c82 | 512 | )|(?P<function> |
8f53dc44 | 513 | (?P<fname>{_NAME_RE})\((?P<args>.*)\)$ |
230d5c82 | 514 | )''', expr) |
515 | if m and m.group('assign'): | |
230d5c82 | 516 | left_val = local_vars.get(m.group('out')) |
517 | ||
518 | if not m.group('index'): | |
8f53dc44 | 519 | local_vars[m.group('out')] = self._operator( |
520 | m.group('op'), left_val, m.group('expr'), expr, local_vars, allow_recursion) | |
521 | return local_vars[m.group('out')], should_return | |
be13a6e5 | 522 | elif left_val in (None, JS_Undefined): |
a1c5bd82 | 523 | raise self.Exception(f'Cannot index undefined variable {m.group("out")}', expr) |
230d5c82 | 524 | |
525 | idx = self.interpret_expression(m.group('index'), local_vars, allow_recursion) | |
8f53dc44 | 526 | if not isinstance(idx, (int, float)): |
a1c5bd82 | 527 | raise self.Exception(f'List index {idx} must be integer', expr) |
8f53dc44 | 528 | idx = int(idx) |
529 | left_val[idx] = self._operator( | |
f6ca640b | 530 | m.group('op'), self._index(left_val, idx), m.group('expr'), expr, local_vars, allow_recursion) |
8f53dc44 | 531 | return left_val[idx], should_return |
9e3f1991 | 532 | |
230d5c82 | 533 | elif expr.isdigit(): |
8f53dc44 | 534 | return int(expr), should_return |
2b25cb5d | 535 | |
230d5c82 | 536 | elif expr == 'break': |
404f611f | 537 | raise JS_Break() |
538 | elif expr == 'continue': | |
539 | raise JS_Continue() | |
be13a6e5 | 540 | elif expr == 'undefined': |
541 | return JS_Undefined, should_return | |
404f611f | 542 | |
230d5c82 | 543 | elif m and m.group('return'): |
be13a6e5 | 544 | return local_vars.get(m.group('name'), JS_Undefined), should_return |
2b25cb5d | 545 | |
19a03940 | 546 | with contextlib.suppress(ValueError): |
8f53dc44 | 547 | return json.loads(js_to_json(expr, strict=True)), should_return |
825abb81 | 548 | |
230d5c82 | 549 | if m and m.group('indexing'): |
7769f837 | 550 | val = local_vars[m.group('in')] |
404f611f | 551 | idx = self.interpret_expression(m.group('idx'), local_vars, allow_recursion) |
8f53dc44 | 552 | return self._index(val, idx), should_return |
7769f837 | 553 | |
8f53dc44 | 554 | for op in _OPERATORS: |
e75bb0d6 | 555 | separated = list(self._separate(expr, op)) |
8f53dc44 | 556 | right_expr = separated.pop() |
be13a6e5 | 557 | while True: |
558 | if op in '?<>*-' and len(separated) > 1 and not separated[-1].strip(): | |
559 | separated.pop() | |
560 | elif not (separated and op == '?' and right_expr.startswith('.')): | |
561 | break | |
49b4ceae | 562 | right_expr = f'{op}{right_expr}' |
563 | if op != '-': | |
564 | right_expr = f'{separated.pop()}{op}{right_expr}' | |
565 | if not separated: | |
566 | continue | |
8f53dc44 | 567 | left_val = self.interpret_expression(op.join(separated), local_vars, allow_recursion) |
6d3e7424 | 568 | return self._operator(op, left_val, right_expr, expr, local_vars, allow_recursion), should_return |
404f611f | 569 | |
230d5c82 | 570 | if m and m.group('attribute'): |
be13a6e5 | 571 | variable, member, nullish = m.group('var', 'member', 'nullish') |
8f53dc44 | 572 | if not member: |
573 | member = self.interpret_expression(m.group('member2'), local_vars, allow_recursion) | |
404f611f | 574 | arg_str = expr[m.end():] |
575 | if arg_str.startswith('('): | |
e75bb0d6 | 576 | arg_str, remaining = self._separate_at_paren(arg_str, ')') |
825abb81 | 577 | else: |
404f611f | 578 | arg_str, remaining = None, arg_str |
579 | ||
580 | def assertion(cndn, msg): | |
581 | """ assert, but without risk of getting optimized out """ | |
582 | if not cndn: | |
a1c5bd82 | 583 | raise self.Exception(f'{member} {msg}', expr) |
404f611f | 584 | |
585 | def eval_method(): | |
8f53dc44 | 586 | if (variable, member) == ('console', 'debug'): |
587 | if Debugger.ENABLED: | |
588 | Debugger.write(self.interpret_expression(f'[{arg_str}]', local_vars, allow_recursion)) | |
589 | return | |
590 | ||
591 | types = { | |
592 | 'String': str, | |
593 | 'Math': float, | |
594 | } | |
595 | obj = local_vars.get(variable, types.get(variable, NO_DEFAULT)) | |
596 | if obj is NO_DEFAULT: | |
404f611f | 597 | if variable not in self._objects: |
be13a6e5 | 598 | try: |
599 | self._objects[variable] = self.extract_object(variable) | |
600 | except self.Exception: | |
601 | if not nullish: | |
602 | raise | |
603 | obj = self._objects.get(variable, JS_Undefined) | |
604 | ||
605 | if nullish and obj is JS_Undefined: | |
606 | return JS_Undefined | |
404f611f | 607 | |
230d5c82 | 608 | # Member access |
404f611f | 609 | if arg_str is None: |
be13a6e5 | 610 | return self._index(obj, member, nullish) |
404f611f | 611 | |
612 | # Function call | |
613 | argvals = [ | |
825abb81 | 614 | self.interpret_expression(v, local_vars, allow_recursion) |
e75bb0d6 | 615 | for v in self._separate(arg_str)] |
404f611f | 616 | |
617 | if obj == str: | |
618 | if member == 'fromCharCode': | |
619 | assertion(argvals, 'takes one or more arguments') | |
620 | return ''.join(map(chr, argvals)) | |
8f53dc44 | 621 | raise self.Exception(f'Unsupported String method {member}', expr) |
622 | elif obj == float: | |
623 | if member == 'pow': | |
624 | assertion(len(argvals) == 2, 'takes two arguments') | |
625 | return argvals[0] ** argvals[1] | |
626 | raise self.Exception(f'Unsupported Math method {member}', expr) | |
404f611f | 627 | |
628 | if member == 'split': | |
629 | assertion(argvals, 'takes one or more arguments') | |
8f53dc44 | 630 | assertion(len(argvals) == 1, 'with limit argument is not implemented') |
631 | return obj.split(argvals[0]) if argvals[0] else list(obj) | |
404f611f | 632 | elif member == 'join': |
633 | assertion(isinstance(obj, list), 'must be applied on a list') | |
634 | assertion(len(argvals) == 1, 'takes exactly one argument') | |
635 | return argvals[0].join(obj) | |
636 | elif member == 'reverse': | |
637 | assertion(not argvals, 'does not take any arguments') | |
638 | obj.reverse() | |
639 | return obj | |
640 | elif member == 'slice': | |
641 | assertion(isinstance(obj, list), 'must be applied on a list') | |
642 | assertion(len(argvals) == 1, 'takes exactly one argument') | |
643 | return obj[argvals[0]:] | |
644 | elif member == 'splice': | |
645 | assertion(isinstance(obj, list), 'must be applied on a list') | |
646 | assertion(argvals, 'takes one or more arguments') | |
57dbe807 | 647 | index, howMany = map(int, (argvals + [len(obj)])[:2]) |
404f611f | 648 | if index < 0: |
649 | index += len(obj) | |
650 | add_items = argvals[2:] | |
651 | res = [] | |
652 | for i in range(index, min(index + howMany, len(obj))): | |
653 | res.append(obj.pop(index)) | |
654 | for i, item in enumerate(add_items): | |
655 | obj.insert(index + i, item) | |
656 | return res | |
657 | elif member == 'unshift': | |
658 | assertion(isinstance(obj, list), 'must be applied on a list') | |
659 | assertion(argvals, 'takes one or more arguments') | |
660 | for item in reversed(argvals): | |
661 | obj.insert(0, item) | |
662 | return obj | |
663 | elif member == 'pop': | |
664 | assertion(isinstance(obj, list), 'must be applied on a list') | |
665 | assertion(not argvals, 'does not take any arguments') | |
666 | if not obj: | |
667 | return | |
668 | return obj.pop() | |
669 | elif member == 'push': | |
670 | assertion(argvals, 'takes one or more arguments') | |
671 | obj.extend(argvals) | |
672 | return obj | |
673 | elif member == 'forEach': | |
674 | assertion(argvals, 'takes one or more arguments') | |
675 | assertion(len(argvals) <= 2, 'takes at-most 2 arguments') | |
676 | f, this = (argvals + [''])[:2] | |
8f53dc44 | 677 | return [f((item, idx, obj), {'this': this}, allow_recursion) for idx, item in enumerate(obj)] |
404f611f | 678 | elif member == 'indexOf': |
679 | assertion(argvals, 'takes one or more arguments') | |
680 | assertion(len(argvals) <= 2, 'takes at-most 2 arguments') | |
681 | idx, start = (argvals + [0])[:2] | |
682 | try: | |
683 | return obj.index(idx, start) | |
684 | except ValueError: | |
685 | return -1 | |
686 | ||
8f53dc44 | 687 | idx = int(member) if isinstance(obj, list) else member |
688 | return obj[idx](argvals, allow_recursion=allow_recursion) | |
404f611f | 689 | |
690 | if remaining: | |
8f53dc44 | 691 | ret, should_abort = self.interpret_statement( |
404f611f | 692 | self._named_object(local_vars, eval_method()) + remaining, |
693 | local_vars, allow_recursion) | |
8f53dc44 | 694 | return ret, should_return or should_abort |
404f611f | 695 | else: |
8f53dc44 | 696 | return eval_method(), should_return |
2b25cb5d | 697 | |
230d5c82 | 698 | elif m and m.group('function'): |
699 | fname = m.group('fname') | |
8f53dc44 | 700 | argvals = [self.interpret_expression(v, local_vars, allow_recursion) |
701 | for v in self._separate(m.group('args'))] | |
404f611f | 702 | if fname in local_vars: |
8f53dc44 | 703 | return local_vars[fname](argvals, allow_recursion=allow_recursion), should_return |
404f611f | 704 | elif fname not in self._functions: |
1f749b66 | 705 | self._functions[fname] = self.extract_function(fname) |
8f53dc44 | 706 | return self._functions[fname](argvals, allow_recursion=allow_recursion), should_return |
707 | ||
708 | raise self.Exception( | |
709 | f'Unsupported JS expression {truncate_string(expr, 20, 20) if expr != stmt else ""}', stmt) | |
9e3f1991 | 710 | |
8f53dc44 | 711 | def interpret_expression(self, expr, local_vars, allow_recursion): |
712 | ret, should_return = self.interpret_statement(expr, local_vars, allow_recursion) | |
713 | if should_return: | |
714 | raise self.Exception('Cannot return from an expression', expr) | |
715 | return ret | |
2b25cb5d | 716 | |
ad25aee2 | 717 | def extract_object(self, objname): |
7769f837 | 718 | _FUNC_NAME_RE = r'''(?:[a-zA-Z$0-9]+|"[a-zA-Z$0-9]+"|'[a-zA-Z$0-9]+')''' |
ad25aee2 JMF |
719 | obj = {} |
720 | obj_m = re.search( | |
0e2d626d S |
721 | r'''(?x) |
722 | (?<!this\.)%s\s*=\s*{\s* | |
723 | (?P<fields>(%s\s*:\s*function\s*\(.*?\)\s*{.*?}(?:,\s*)?)*) | |
724 | }\s*; | |
725 | ''' % (re.escape(objname), _FUNC_NAME_RE), | |
ad25aee2 | 726 | self.code) |
8f53dc44 | 727 | if not obj_m: |
728 | raise self.Exception(f'Could not find object {objname}') | |
ad25aee2 JMF |
729 | fields = obj_m.group('fields') |
730 | # Currently, it only supports function definitions | |
731 | fields_m = re.finditer( | |
0e2d626d | 732 | r'''(?x) |
49b4ceae | 733 | (?P<key>%s)\s*:\s*function\s*\((?P<args>(?:%s|,)*)\){(?P<code>[^}]+)} |
734 | ''' % (_FUNC_NAME_RE, _NAME_RE), | |
ad25aee2 JMF |
735 | fields) |
736 | for f in fields_m: | |
737 | argnames = f.group('args').split(',') | |
7769f837 | 738 | obj[remove_quotes(f.group('key'))] = self.build_function(argnames, f.group('code')) |
ad25aee2 JMF |
739 | |
740 | return obj | |
741 | ||
404f611f | 742 | def extract_function_code(self, funcname): |
743 | """ @returns argnames, code """ | |
2b25cb5d | 744 | func_m = re.search( |
8f53dc44 | 745 | r'''(?xs) |
230d5c82 | 746 | (?: |
747 | function\s+%(name)s| | |
748 | [{;,]\s*%(name)s\s*=\s*function| | |
49b4ceae | 749 | (?:var|const|let)\s+%(name)s\s*=\s*function |
230d5c82 | 750 | )\s* |
9e3f1991 | 751 | \((?P<args>[^)]*)\)\s* |
8f53dc44 | 752 | (?P<code>{.+})''' % {'name': re.escape(funcname)}, |
2b25cb5d | 753 | self.code) |
8f53dc44 | 754 | code, _ = self._separate_at_paren(func_m.group('code'), '}') |
77ffa957 | 755 | if func_m is None: |
a1c5bd82 | 756 | raise self.Exception(f'Could not find JS function "{funcname}"') |
8f53dc44 | 757 | return [x.strip() for x in func_m.group('args').split(',')], code |
2b25cb5d | 758 | |
404f611f | 759 | def extract_function(self, funcname): |
760 | return self.extract_function_from_code(*self.extract_function_code(funcname)) | |
761 | ||
762 | def extract_function_from_code(self, argnames, code, *global_stack): | |
763 | local_vars = {} | |
764 | while True: | |
765 | mobj = re.search(r'function\((?P<args>[^)]*)\)\s*{', code) | |
766 | if mobj is None: | |
767 | break | |
768 | start, body_start = mobj.span() | |
e75bb0d6 | 769 | body, remaining = self._separate_at_paren(code[body_start - 1:], '}') |
230d5c82 | 770 | name = self._named_object(local_vars, self.extract_function_from_code( |
771 | [x.strip() for x in mobj.group('args').split(',')], | |
772 | body, local_vars, *global_stack)) | |
404f611f | 773 | code = code[:start] + name + remaining |
774 | return self.build_function(argnames, code, local_vars, *global_stack) | |
ad25aee2 | 775 | |
9e3f1991 | 776 | def call_function(self, funcname, *args): |
404f611f | 777 | return self.extract_function(funcname)(args) |
778 | ||
779 | def build_function(self, argnames, code, *global_stack): | |
780 | global_stack = list(global_stack) or [{}] | |
8f53dc44 | 781 | argnames = tuple(argnames) |
404f611f | 782 | |
8f53dc44 | 783 | def resf(args, kwargs={}, allow_recursion=100): |
49b4ceae | 784 | global_stack[0].update(itertools.zip_longest(argnames, args, fillvalue=None)) |
785 | global_stack[0].update(kwargs) | |
19a03940 | 786 | var_stack = LocalNameSpace(*global_stack) |
8f53dc44 | 787 | ret, should_abort = self.interpret_statement(code.replace('\n', ''), var_stack, allow_recursion - 1) |
788 | if should_abort: | |
789 | return ret | |
2b25cb5d | 790 | return resf |