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Commit | Line | Data |
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825abb81 | 1 | import json |
9e3f1991 | 2 | import operator |
2b25cb5d | 3 | import re |
f8271158 | 4 | from collections.abc import MutableMapping |
2b25cb5d | 5 | |
f8271158 | 6 | from .utils import ExtractorError, remove_quotes |
2b25cb5d | 7 | |
9e3f1991 PH |
8 | _OPERATORS = [ |
9 | ('|', operator.or_), | |
10 | ('^', operator.xor), | |
11 | ('&', operator.and_), | |
12 | ('>>', operator.rshift), | |
13 | ('<<', operator.lshift), | |
14 | ('-', operator.sub), | |
15 | ('+', operator.add), | |
16 | ('%', operator.mod), | |
8cfb6efe | 17 | ('/', operator.truediv), |
9e3f1991 PH |
18 | ('*', operator.mul), |
19 | ] | |
20 | _ASSIGN_OPERATORS = [(op + '=', opfunc) for op, opfunc in _OPERATORS] | |
404f611f | 21 | _ASSIGN_OPERATORS.append(('=', (lambda cur, right: right))) |
9e3f1991 PH |
22 | |
23 | _NAME_RE = r'[a-zA-Z_$][a-zA-Z_$0-9]*' | |
24 | ||
06dfe0a0 | 25 | _MATCHING_PARENS = dict(zip('({[', ')}]')) |
26 | ||
2b25cb5d | 27 | |
404f611f | 28 | class JS_Break(ExtractorError): |
29 | def __init__(self): | |
30 | ExtractorError.__init__(self, 'Invalid break') | |
31 | ||
32 | ||
33 | class JS_Continue(ExtractorError): | |
34 | def __init__(self): | |
35 | ExtractorError.__init__(self, 'Invalid continue') | |
36 | ||
37 | ||
38 | class LocalNameSpace(MutableMapping): | |
39 | def __init__(self, *stack): | |
40 | self.stack = tuple(stack) | |
41 | ||
42 | def __getitem__(self, key): | |
43 | for scope in self.stack: | |
44 | if key in scope: | |
45 | return scope[key] | |
46 | raise KeyError(key) | |
47 | ||
48 | def __setitem__(self, key, value): | |
49 | for scope in self.stack: | |
50 | if key in scope: | |
51 | scope[key] = value | |
52 | break | |
53 | else: | |
54 | self.stack[0][key] = value | |
55 | return value | |
56 | ||
57 | def __delitem__(self, key): | |
58 | raise NotImplementedError('Deleting is not supported') | |
59 | ||
60 | def __iter__(self): | |
61 | for scope in self.stack: | |
62 | yield from scope | |
63 | ||
64 | def __len__(self, key): | |
65 | return len(iter(self)) | |
66 | ||
67 | def __repr__(self): | |
68 | return f'LocalNameSpace{self.stack}' | |
69 | ||
70 | ||
86e5f3ed | 71 | class JSInterpreter: |
9e3f1991 PH |
72 | def __init__(self, code, objects=None): |
73 | if objects is None: | |
74 | objects = {} | |
3eff81fb | 75 | self.code = code |
2b25cb5d | 76 | self._functions = {} |
9e3f1991 | 77 | self._objects = objects |
404f611f | 78 | self.__named_object_counter = 0 |
79 | ||
80 | def _named_object(self, namespace, obj): | |
81 | self.__named_object_counter += 1 | |
82 | name = f'__yt_dlp_jsinterp_obj{self.__named_object_counter}' | |
83 | namespace[name] = obj | |
84 | return name | |
85 | ||
86 | @staticmethod | |
e75bb0d6 | 87 | def _separate(expr, delim=',', max_split=None): |
404f611f | 88 | if not expr: |
89 | return | |
06dfe0a0 | 90 | counters = {k: 0 for k in _MATCHING_PARENS.values()} |
91 | start, splits, pos, delim_len = 0, 0, 0, len(delim) - 1 | |
404f611f | 92 | for idx, char in enumerate(expr): |
06dfe0a0 | 93 | if char in _MATCHING_PARENS: |
94 | counters[_MATCHING_PARENS[char]] += 1 | |
95 | elif char in counters: | |
96 | counters[char] -= 1 | |
97 | if char != delim[pos] or any(counters.values()): | |
404f611f | 98 | pos = 0 |
06dfe0a0 | 99 | continue |
100 | elif pos != delim_len: | |
101 | pos += 1 | |
102 | continue | |
103 | yield expr[start: idx - delim_len] | |
104 | start, pos = idx + 1, 0 | |
105 | splits += 1 | |
106 | if max_split and splits >= max_split: | |
107 | break | |
404f611f | 108 | yield expr[start:] |
109 | ||
110 | @staticmethod | |
e75bb0d6 U |
111 | def _separate_at_paren(expr, delim): |
112 | separated = list(JSInterpreter._separate(expr, delim, 1)) | |
113 | if len(separated) < 2: | |
404f611f | 114 | raise ExtractorError(f'No terminating paren {delim} in {expr}') |
e75bb0d6 | 115 | return separated[0][1:].strip(), separated[1].strip() |
9e3f1991 | 116 | |
9e3f1991 | 117 | def interpret_statement(self, stmt, local_vars, allow_recursion=100): |
2b25cb5d PH |
118 | if allow_recursion < 0: |
119 | raise ExtractorError('Recursion limit reached') | |
120 | ||
e75bb0d6 | 121 | sub_statements = list(self._separate(stmt, ';')) |
404f611f | 122 | stmt = (sub_statements or ['']).pop() |
123 | for sub_stmt in sub_statements: | |
124 | ret, should_abort = self.interpret_statement(sub_stmt, local_vars, allow_recursion - 1) | |
125 | if should_abort: | |
126 | return ret | |
127 | ||
9e3f1991 PH |
128 | should_abort = False |
129 | stmt = stmt.lstrip() | |
130 | stmt_m = re.match(r'var\s', stmt) | |
131 | if stmt_m: | |
132 | expr = stmt[len(stmt_m.group(0)):] | |
2b25cb5d | 133 | else: |
9e3f1991 PH |
134 | return_m = re.match(r'return(?:\s+|$)', stmt) |
135 | if return_m: | |
136 | expr = stmt[len(return_m.group(0)):] | |
137 | should_abort = True | |
138 | else: | |
139 | # Try interpreting it as an expression | |
140 | expr = stmt | |
2b25cb5d PH |
141 | |
142 | v = self.interpret_expression(expr, local_vars, allow_recursion) | |
9e3f1991 | 143 | return v, should_abort |
2b25cb5d PH |
144 | |
145 | def interpret_expression(self, expr, local_vars, allow_recursion): | |
9e3f1991 | 146 | expr = expr.strip() |
9e3f1991 PH |
147 | if expr == '': # Empty expression |
148 | return None | |
149 | ||
404f611f | 150 | if expr.startswith('{'): |
e75bb0d6 | 151 | inner, outer = self._separate_at_paren(expr, '}') |
404f611f | 152 | inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion - 1) |
153 | if not outer or should_abort: | |
154 | return inner | |
155 | else: | |
156 | expr = json.dumps(inner) + outer | |
157 | ||
9e3f1991 | 158 | if expr.startswith('('): |
e75bb0d6 | 159 | inner, outer = self._separate_at_paren(expr, ')') |
404f611f | 160 | inner = self.interpret_expression(inner, local_vars, allow_recursion) |
161 | if not outer: | |
162 | return inner | |
163 | else: | |
164 | expr = json.dumps(inner) + outer | |
165 | ||
166 | if expr.startswith('['): | |
e75bb0d6 | 167 | inner, outer = self._separate_at_paren(expr, ']') |
404f611f | 168 | name = self._named_object(local_vars, [ |
169 | self.interpret_expression(item, local_vars, allow_recursion) | |
e75bb0d6 | 170 | for item in self._separate(inner)]) |
404f611f | 171 | expr = name + outer |
172 | ||
173 | m = re.match(r'try\s*', expr) | |
174 | if m: | |
175 | if expr[m.end()] == '{': | |
e75bb0d6 | 176 | try_expr, expr = self._separate_at_paren(expr[m.end():], '}') |
404f611f | 177 | else: |
178 | try_expr, expr = expr[m.end() - 1:], '' | |
179 | ret, should_abort = self.interpret_statement(try_expr, local_vars, allow_recursion - 1) | |
180 | if should_abort: | |
181 | return ret | |
182 | return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0] | |
183 | ||
184 | m = re.match(r'catch\s*\(', expr) | |
185 | if m: | |
186 | # We ignore the catch block | |
e75bb0d6 | 187 | _, expr = self._separate_at_paren(expr, '}') |
404f611f | 188 | return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0] |
189 | ||
190 | m = re.match(r'for\s*\(', expr) | |
191 | if m: | |
e75bb0d6 | 192 | constructor, remaining = self._separate_at_paren(expr[m.end() - 1:], ')') |
404f611f | 193 | if remaining.startswith('{'): |
e75bb0d6 | 194 | body, expr = self._separate_at_paren(remaining, '}') |
404f611f | 195 | else: |
196 | m = re.match(r'switch\s*\(', remaining) # FIXME | |
197 | if m: | |
e75bb0d6 U |
198 | switch_val, remaining = self._separate_at_paren(remaining[m.end() - 1:], ')') |
199 | body, expr = self._separate_at_paren(remaining, '}') | |
404f611f | 200 | body = 'switch(%s){%s}' % (switch_val, body) |
9e3f1991 | 201 | else: |
404f611f | 202 | body, expr = remaining, '' |
e75bb0d6 | 203 | start, cndn, increment = self._separate(constructor, ';') |
404f611f | 204 | if self.interpret_statement(start, local_vars, allow_recursion - 1)[1]: |
205 | raise ExtractorError( | |
206 | f'Premature return in the initialization of a for loop in {constructor!r}') | |
207 | while True: | |
208 | if not self.interpret_expression(cndn, local_vars, allow_recursion): | |
209 | break | |
210 | try: | |
211 | ret, should_abort = self.interpret_statement(body, local_vars, allow_recursion - 1) | |
212 | if should_abort: | |
213 | return ret | |
214 | except JS_Break: | |
215 | break | |
216 | except JS_Continue: | |
217 | pass | |
218 | if self.interpret_statement(increment, local_vars, allow_recursion - 1)[1]: | |
219 | raise ExtractorError( | |
220 | f'Premature return in the initialization of a for loop in {constructor!r}') | |
221 | return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0] | |
222 | ||
223 | m = re.match(r'switch\s*\(', expr) | |
224 | if m: | |
e75bb0d6 | 225 | switch_val, remaining = self._separate_at_paren(expr[m.end() - 1:], ')') |
404f611f | 226 | switch_val = self.interpret_expression(switch_val, local_vars, allow_recursion) |
e75bb0d6 | 227 | body, expr = self._separate_at_paren(remaining, '}') |
a1fc7ca0 | 228 | items = body.replace('default:', 'case default:').split('case ')[1:] |
229 | for default in (False, True): | |
230 | matched = False | |
231 | for item in items: | |
86e5f3ed | 232 | case, stmt = (i.strip() for i in self._separate(item, ':', 1)) |
a1fc7ca0 | 233 | if default: |
234 | matched = matched or case == 'default' | |
235 | elif not matched: | |
236 | matched = case != 'default' and switch_val == self.interpret_expression(case, local_vars, allow_recursion) | |
237 | if not matched: | |
238 | continue | |
404f611f | 239 | try: |
240 | ret, should_abort = self.interpret_statement(stmt, local_vars, allow_recursion - 1) | |
241 | if should_abort: | |
242 | return ret | |
243 | except JS_Break: | |
9e3f1991 | 244 | break |
a1fc7ca0 | 245 | if matched: |
246 | break | |
404f611f | 247 | return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0] |
248 | ||
e75bb0d6 U |
249 | # Comma separated statements |
250 | sub_expressions = list(self._separate(expr)) | |
404f611f | 251 | expr = sub_expressions.pop().strip() if sub_expressions else '' |
252 | for sub_expr in sub_expressions: | |
253 | self.interpret_expression(sub_expr, local_vars, allow_recursion) | |
254 | ||
255 | for m in re.finditer(rf'''(?x) | |
256 | (?P<pre_sign>\+\+|--)(?P<var1>{_NAME_RE})| | |
257 | (?P<var2>{_NAME_RE})(?P<post_sign>\+\+|--)''', expr): | |
258 | var = m.group('var1') or m.group('var2') | |
259 | start, end = m.span() | |
260 | sign = m.group('pre_sign') or m.group('post_sign') | |
261 | ret = local_vars[var] | |
262 | local_vars[var] += 1 if sign[0] == '+' else -1 | |
263 | if m.group('pre_sign'): | |
264 | ret = local_vars[var] | |
265 | expr = expr[:start] + json.dumps(ret) + expr[end:] | |
9e3f1991 PH |
266 | |
267 | for op, opfunc in _ASSIGN_OPERATORS: | |
86e5f3ed | 268 | m = re.match(rf'''(?x) |
269 | (?P<out>{_NAME_RE})(?:\[(?P<index>[^\]]+?)\])? | |
270 | \s*{re.escape(op)} | |
271 | (?P<expr>.*)$''', expr) | |
9e3f1991 PH |
272 | if not m: |
273 | continue | |
404f611f | 274 | right_val = self.interpret_expression(m.group('expr'), local_vars, allow_recursion) |
9e3f1991 PH |
275 | |
276 | if m.groupdict().get('index'): | |
277 | lvar = local_vars[m.group('out')] | |
404f611f | 278 | idx = self.interpret_expression(m.group('index'), local_vars, allow_recursion) |
279 | if not isinstance(idx, int): | |
280 | raise ExtractorError(f'List indices must be integers: {idx}') | |
9e3f1991 PH |
281 | cur = lvar[idx] |
282 | val = opfunc(cur, right_val) | |
283 | lvar[idx] = val | |
284 | return val | |
285 | else: | |
286 | cur = local_vars.get(m.group('out')) | |
287 | val = opfunc(cur, right_val) | |
288 | local_vars[m.group('out')] = val | |
289 | return val | |
290 | ||
2b25cb5d PH |
291 | if expr.isdigit(): |
292 | return int(expr) | |
293 | ||
404f611f | 294 | if expr == 'break': |
295 | raise JS_Break() | |
296 | elif expr == 'continue': | |
297 | raise JS_Continue() | |
298 | ||
9e3f1991 | 299 | var_m = re.match( |
404f611f | 300 | r'(?!if|return|true|false|null)(?P<name>%s)$' % _NAME_RE, |
9e3f1991 PH |
301 | expr) |
302 | if var_m: | |
303 | return local_vars[var_m.group('name')] | |
2b25cb5d | 304 | |
825abb81 PH |
305 | try: |
306 | return json.loads(expr) | |
307 | except ValueError: | |
308 | pass | |
309 | ||
310 | m = re.match( | |
7769f837 S |
311 | r'(?P<in>%s)\[(?P<idx>.+)\]$' % _NAME_RE, expr) |
312 | if m: | |
313 | val = local_vars[m.group('in')] | |
404f611f | 314 | idx = self.interpret_expression(m.group('idx'), local_vars, allow_recursion) |
7769f837 S |
315 | return val[idx] |
316 | ||
404f611f | 317 | for op, opfunc in _OPERATORS: |
e75bb0d6 U |
318 | separated = list(self._separate(expr, op)) |
319 | if len(separated) < 2: | |
404f611f | 320 | continue |
e75bb0d6 U |
321 | right_val = separated.pop() |
322 | left_val = op.join(separated) | |
404f611f | 323 | left_val, should_abort = self.interpret_statement( |
324 | left_val, local_vars, allow_recursion - 1) | |
325 | if should_abort: | |
326 | raise ExtractorError(f'Premature left-side return of {op} in {expr!r}') | |
327 | right_val, should_abort = self.interpret_statement( | |
328 | right_val, local_vars, allow_recursion - 1) | |
329 | if should_abort: | |
330 | raise ExtractorError(f'Premature right-side return of {op} in {expr!r}') | |
331 | return opfunc(left_val or 0, right_val) | |
332 | ||
7769f837 | 333 | m = re.match( |
404f611f | 334 | r'(?P<var>%s)(?:\.(?P<member>[^(]+)|\[(?P<member2>[^]]+)\])\s*' % _NAME_RE, |
825abb81 | 335 | expr) |
2b25cb5d | 336 | if m: |
825abb81 | 337 | variable = m.group('var') |
7769f837 | 338 | member = remove_quotes(m.group('member') or m.group('member2')) |
404f611f | 339 | arg_str = expr[m.end():] |
340 | if arg_str.startswith('('): | |
e75bb0d6 | 341 | arg_str, remaining = self._separate_at_paren(arg_str, ')') |
825abb81 | 342 | else: |
404f611f | 343 | arg_str, remaining = None, arg_str |
344 | ||
345 | def assertion(cndn, msg): | |
346 | """ assert, but without risk of getting optimized out """ | |
347 | if not cndn: | |
348 | raise ExtractorError(f'{member} {msg}: {expr}') | |
349 | ||
350 | def eval_method(): | |
351 | nonlocal member | |
352 | if variable == 'String': | |
353 | obj = str | |
354 | elif variable in local_vars: | |
355 | obj = local_vars[variable] | |
356 | else: | |
357 | if variable not in self._objects: | |
358 | self._objects[variable] = self.extract_object(variable) | |
359 | obj = self._objects[variable] | |
360 | ||
361 | if arg_str is None: | |
362 | # Member access | |
363 | if member == 'length': | |
364 | return len(obj) | |
365 | return obj[member] | |
366 | ||
367 | # Function call | |
368 | argvals = [ | |
825abb81 | 369 | self.interpret_expression(v, local_vars, allow_recursion) |
e75bb0d6 | 370 | for v in self._separate(arg_str)] |
404f611f | 371 | |
372 | if obj == str: | |
373 | if member == 'fromCharCode': | |
374 | assertion(argvals, 'takes one or more arguments') | |
375 | return ''.join(map(chr, argvals)) | |
376 | raise ExtractorError(f'Unsupported string method {member}') | |
377 | ||
378 | if member == 'split': | |
379 | assertion(argvals, 'takes one or more arguments') | |
380 | assertion(argvals == [''], 'with arguments is not implemented') | |
381 | return list(obj) | |
382 | elif member == 'join': | |
383 | assertion(isinstance(obj, list), 'must be applied on a list') | |
384 | assertion(len(argvals) == 1, 'takes exactly one argument') | |
385 | return argvals[0].join(obj) | |
386 | elif member == 'reverse': | |
387 | assertion(not argvals, 'does not take any arguments') | |
388 | obj.reverse() | |
389 | return obj | |
390 | elif member == 'slice': | |
391 | assertion(isinstance(obj, list), 'must be applied on a list') | |
392 | assertion(len(argvals) == 1, 'takes exactly one argument') | |
393 | return obj[argvals[0]:] | |
394 | elif member == 'splice': | |
395 | assertion(isinstance(obj, list), 'must be applied on a list') | |
396 | assertion(argvals, 'takes one or more arguments') | |
57dbe807 | 397 | index, howMany = map(int, (argvals + [len(obj)])[:2]) |
404f611f | 398 | if index < 0: |
399 | index += len(obj) | |
400 | add_items = argvals[2:] | |
401 | res = [] | |
402 | for i in range(index, min(index + howMany, len(obj))): | |
403 | res.append(obj.pop(index)) | |
404 | for i, item in enumerate(add_items): | |
405 | obj.insert(index + i, item) | |
406 | return res | |
407 | elif member == 'unshift': | |
408 | assertion(isinstance(obj, list), 'must be applied on a list') | |
409 | assertion(argvals, 'takes one or more arguments') | |
410 | for item in reversed(argvals): | |
411 | obj.insert(0, item) | |
412 | return obj | |
413 | elif member == 'pop': | |
414 | assertion(isinstance(obj, list), 'must be applied on a list') | |
415 | assertion(not argvals, 'does not take any arguments') | |
416 | if not obj: | |
417 | return | |
418 | return obj.pop() | |
419 | elif member == 'push': | |
420 | assertion(argvals, 'takes one or more arguments') | |
421 | obj.extend(argvals) | |
422 | return obj | |
423 | elif member == 'forEach': | |
424 | assertion(argvals, 'takes one or more arguments') | |
425 | assertion(len(argvals) <= 2, 'takes at-most 2 arguments') | |
426 | f, this = (argvals + [''])[:2] | |
427 | return [f((item, idx, obj), this=this) for idx, item in enumerate(obj)] | |
428 | elif member == 'indexOf': | |
429 | assertion(argvals, 'takes one or more arguments') | |
430 | assertion(len(argvals) <= 2, 'takes at-most 2 arguments') | |
431 | idx, start = (argvals + [0])[:2] | |
432 | try: | |
433 | return obj.index(idx, start) | |
434 | except ValueError: | |
435 | return -1 | |
436 | ||
437 | if isinstance(obj, list): | |
438 | member = int(member) | |
439 | return obj[member](argvals) | |
440 | ||
441 | if remaining: | |
442 | return self.interpret_expression( | |
443 | self._named_object(local_vars, eval_method()) + remaining, | |
444 | local_vars, allow_recursion) | |
445 | else: | |
446 | return eval_method() | |
2b25cb5d | 447 | |
404f611f | 448 | m = re.match(r'^(?P<func>%s)\((?P<args>[a-zA-Z0-9_$,]*)\)$' % _NAME_RE, expr) |
2b25cb5d PH |
449 | if m: |
450 | fname = m.group('func') | |
86e5f3ed | 451 | argvals = tuple( |
825abb81 | 452 | int(v) if v.isdigit() else local_vars[v] |
86e5f3ed | 453 | for v in self._separate(m.group('args'))) |
404f611f | 454 | if fname in local_vars: |
455 | return local_vars[fname](argvals) | |
456 | elif fname not in self._functions: | |
1f749b66 | 457 | self._functions[fname] = self.extract_function(fname) |
2b25cb5d | 458 | return self._functions[fname](argvals) |
9e3f1991 | 459 | |
404f611f | 460 | if expr: |
461 | raise ExtractorError('Unsupported JS expression %r' % expr) | |
2b25cb5d | 462 | |
ad25aee2 | 463 | def extract_object(self, objname): |
7769f837 | 464 | _FUNC_NAME_RE = r'''(?:[a-zA-Z$0-9]+|"[a-zA-Z$0-9]+"|'[a-zA-Z$0-9]+')''' |
ad25aee2 JMF |
465 | obj = {} |
466 | obj_m = re.search( | |
0e2d626d S |
467 | r'''(?x) |
468 | (?<!this\.)%s\s*=\s*{\s* | |
469 | (?P<fields>(%s\s*:\s*function\s*\(.*?\)\s*{.*?}(?:,\s*)?)*) | |
470 | }\s*; | |
471 | ''' % (re.escape(objname), _FUNC_NAME_RE), | |
ad25aee2 JMF |
472 | self.code) |
473 | fields = obj_m.group('fields') | |
474 | # Currently, it only supports function definitions | |
475 | fields_m = re.finditer( | |
0e2d626d S |
476 | r'''(?x) |
477 | (?P<key>%s)\s*:\s*function\s*\((?P<args>[a-z,]+)\){(?P<code>[^}]+)} | |
478 | ''' % _FUNC_NAME_RE, | |
ad25aee2 JMF |
479 | fields) |
480 | for f in fields_m: | |
481 | argnames = f.group('args').split(',') | |
7769f837 | 482 | obj[remove_quotes(f.group('key'))] = self.build_function(argnames, f.group('code')) |
ad25aee2 JMF |
483 | |
484 | return obj | |
485 | ||
404f611f | 486 | def extract_function_code(self, funcname): |
487 | """ @returns argnames, code """ | |
2b25cb5d | 488 | func_m = re.search( |
9e3f1991 | 489 | r'''(?x) |
b46eabec | 490 | (?:function\s+%s|[{;,]\s*%s\s*=\s*function|var\s+%s\s*=\s*function)\s* |
9e3f1991 | 491 | \((?P<args>[^)]*)\)\s* |
404f611f | 492 | (?P<code>\{(?:(?!};)[^"]|"([^"]|\\")*")+\})''' % ( |
ff29bf81 | 493 | re.escape(funcname), re.escape(funcname), re.escape(funcname)), |
2b25cb5d | 494 | self.code) |
e75bb0d6 | 495 | code, _ = self._separate_at_paren(func_m.group('code'), '}') # refine the match |
77ffa957 PH |
496 | if func_m is None: |
497 | raise ExtractorError('Could not find JS function %r' % funcname) | |
404f611f | 498 | return func_m.group('args').split(','), code |
2b25cb5d | 499 | |
404f611f | 500 | def extract_function(self, funcname): |
501 | return self.extract_function_from_code(*self.extract_function_code(funcname)) | |
502 | ||
503 | def extract_function_from_code(self, argnames, code, *global_stack): | |
504 | local_vars = {} | |
505 | while True: | |
506 | mobj = re.search(r'function\((?P<args>[^)]*)\)\s*{', code) | |
507 | if mobj is None: | |
508 | break | |
509 | start, body_start = mobj.span() | |
e75bb0d6 | 510 | body, remaining = self._separate_at_paren(code[body_start - 1:], '}') |
404f611f | 511 | name = self._named_object( |
512 | local_vars, | |
513 | self.extract_function_from_code( | |
514 | [str.strip(x) for x in mobj.group('args').split(',')], | |
515 | body, local_vars, *global_stack)) | |
516 | code = code[:start] + name + remaining | |
517 | return self.build_function(argnames, code, local_vars, *global_stack) | |
ad25aee2 | 518 | |
9e3f1991 | 519 | def call_function(self, funcname, *args): |
404f611f | 520 | return self.extract_function(funcname)(args) |
521 | ||
522 | def build_function(self, argnames, code, *global_stack): | |
523 | global_stack = list(global_stack) or [{}] | |
524 | local_vars = global_stack.pop(0) | |
525 | ||
526 | def resf(args, **kwargs): | |
527 | local_vars.update({ | |
528 | **dict(zip(argnames, args)), | |
529 | **kwargs | |
530 | }) | |
531 | var_stack = LocalNameSpace(local_vars, *global_stack) | |
e75bb0d6 | 532 | for stmt in self._separate(code.replace('\n', ''), ';'): |
404f611f | 533 | ret, should_abort = self.interpret_statement(stmt, var_stack) |
534 | if should_abort: | |
9e3f1991 | 535 | break |
404f611f | 536 | return ret |
2b25cb5d | 537 | return resf |