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