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Commit | Line | Data |
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19a03940 | 1 | import collections |
2 | import contextlib | |
825abb81 | 3 | import json |
9e3f1991 | 4 | import operator |
2b25cb5d PH |
5 | import re |
6 | ||
f8271158 | 7 | from .utils import ExtractorError, remove_quotes |
2b25cb5d | 8 | |
9e3f1991 PH |
9 | _OPERATORS = [ |
10 | ('|', operator.or_), | |
11 | ('^', operator.xor), | |
12 | ('&', operator.and_), | |
13 | ('>>', operator.rshift), | |
14 | ('<<', operator.lshift), | |
15 | ('-', operator.sub), | |
16 | ('+', operator.add), | |
17 | ('%', operator.mod), | |
8cfb6efe | 18 | ('/', operator.truediv), |
9e3f1991 PH |
19 | ('*', operator.mul), |
20 | ] | |
21 | _ASSIGN_OPERATORS = [(op + '=', opfunc) for op, opfunc in _OPERATORS] | |
404f611f | 22 | _ASSIGN_OPERATORS.append(('=', (lambda cur, right: right))) |
9e3f1991 PH |
23 | |
24 | _NAME_RE = r'[a-zA-Z_$][a-zA-Z_$0-9]*' | |
25 | ||
06dfe0a0 | 26 | _MATCHING_PARENS = dict(zip('({[', ')}]')) |
64fa820c | 27 | _QUOTES = '\'"' |
06dfe0a0 | 28 | |
2b25cb5d | 29 | |
404f611f | 30 | class JS_Break(ExtractorError): |
31 | def __init__(self): | |
32 | ExtractorError.__init__(self, 'Invalid break') | |
33 | ||
34 | ||
35 | class JS_Continue(ExtractorError): | |
36 | def __init__(self): | |
37 | ExtractorError.__init__(self, 'Invalid continue') | |
38 | ||
39 | ||
19a03940 | 40 | class LocalNameSpace(collections.ChainMap): |
404f611f | 41 | def __setitem__(self, key, value): |
19a03940 | 42 | for scope in self.maps: |
404f611f | 43 | if key in scope: |
44 | scope[key] = value | |
19a03940 | 45 | return |
46 | self.maps[0][key] = value | |
404f611f | 47 | |
48 | def __delitem__(self, key): | |
49 | raise NotImplementedError('Deleting is not supported') | |
50 | ||
404f611f | 51 | |
86e5f3ed | 52 | class JSInterpreter: |
9e3f1991 PH |
53 | def __init__(self, code, objects=None): |
54 | if objects is None: | |
55 | objects = {} | |
3eff81fb | 56 | self.code = code |
2b25cb5d | 57 | self._functions = {} |
9e3f1991 | 58 | self._objects = objects |
404f611f | 59 | self.__named_object_counter = 0 |
60 | ||
61 | def _named_object(self, namespace, obj): | |
62 | self.__named_object_counter += 1 | |
63 | name = f'__yt_dlp_jsinterp_obj{self.__named_object_counter}' | |
64 | namespace[name] = obj | |
65 | return name | |
66 | ||
67 | @staticmethod | |
e75bb0d6 | 68 | def _separate(expr, delim=',', max_split=None): |
404f611f | 69 | if not expr: |
70 | return | |
06dfe0a0 | 71 | counters = {k: 0 for k in _MATCHING_PARENS.values()} |
72 | start, splits, pos, delim_len = 0, 0, 0, len(delim) - 1 | |
64fa820c | 73 | in_quote, escaping = None, False |
404f611f | 74 | for idx, char in enumerate(expr): |
06dfe0a0 | 75 | if char in _MATCHING_PARENS: |
76 | counters[_MATCHING_PARENS[char]] += 1 | |
77 | elif char in counters: | |
78 | counters[char] -= 1 | |
64fa820c | 79 | elif not escaping and char in _QUOTES and in_quote in (char, None): |
80 | in_quote = None if in_quote else char | |
81 | escaping = not escaping and in_quote and char == '\\' | |
82 | ||
83 | if char != delim[pos] or any(counters.values()) or in_quote: | |
404f611f | 84 | pos = 0 |
06dfe0a0 | 85 | continue |
86 | elif pos != delim_len: | |
87 | pos += 1 | |
88 | continue | |
89 | yield expr[start: idx - delim_len] | |
90 | start, pos = idx + 1, 0 | |
91 | splits += 1 | |
92 | if max_split and splits >= max_split: | |
93 | break | |
404f611f | 94 | yield expr[start:] |
95 | ||
96 | @staticmethod | |
e75bb0d6 U |
97 | def _separate_at_paren(expr, delim): |
98 | separated = list(JSInterpreter._separate(expr, delim, 1)) | |
99 | if len(separated) < 2: | |
404f611f | 100 | raise ExtractorError(f'No terminating paren {delim} in {expr}') |
e75bb0d6 | 101 | return separated[0][1:].strip(), separated[1].strip() |
9e3f1991 | 102 | |
9e3f1991 | 103 | def interpret_statement(self, stmt, local_vars, allow_recursion=100): |
2b25cb5d PH |
104 | if allow_recursion < 0: |
105 | raise ExtractorError('Recursion limit reached') | |
106 | ||
e75bb0d6 | 107 | sub_statements = list(self._separate(stmt, ';')) |
404f611f | 108 | stmt = (sub_statements or ['']).pop() |
109 | for sub_stmt in sub_statements: | |
110 | ret, should_abort = self.interpret_statement(sub_stmt, local_vars, allow_recursion - 1) | |
111 | if should_abort: | |
112 | return ret | |
113 | ||
9e3f1991 PH |
114 | should_abort = False |
115 | stmt = stmt.lstrip() | |
116 | stmt_m = re.match(r'var\s', stmt) | |
117 | if stmt_m: | |
118 | expr = stmt[len(stmt_m.group(0)):] | |
2b25cb5d | 119 | else: |
9e3f1991 PH |
120 | return_m = re.match(r'return(?:\s+|$)', stmt) |
121 | if return_m: | |
122 | expr = stmt[len(return_m.group(0)):] | |
123 | should_abort = True | |
124 | else: | |
125 | # Try interpreting it as an expression | |
126 | expr = stmt | |
2b25cb5d PH |
127 | |
128 | v = self.interpret_expression(expr, local_vars, allow_recursion) | |
9e3f1991 | 129 | return v, should_abort |
2b25cb5d PH |
130 | |
131 | def interpret_expression(self, expr, local_vars, allow_recursion): | |
9e3f1991 | 132 | expr = expr.strip() |
9e3f1991 PH |
133 | if expr == '': # Empty expression |
134 | return None | |
135 | ||
404f611f | 136 | if expr.startswith('{'): |
e75bb0d6 | 137 | inner, outer = self._separate_at_paren(expr, '}') |
404f611f | 138 | inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion - 1) |
139 | if not outer or should_abort: | |
140 | return inner | |
141 | else: | |
142 | expr = json.dumps(inner) + outer | |
143 | ||
9e3f1991 | 144 | if expr.startswith('('): |
e75bb0d6 | 145 | inner, outer = self._separate_at_paren(expr, ')') |
404f611f | 146 | inner = self.interpret_expression(inner, local_vars, allow_recursion) |
147 | if not outer: | |
148 | return inner | |
149 | else: | |
150 | expr = json.dumps(inner) + outer | |
151 | ||
152 | if expr.startswith('['): | |
e75bb0d6 | 153 | inner, outer = self._separate_at_paren(expr, ']') |
404f611f | 154 | name = self._named_object(local_vars, [ |
155 | self.interpret_expression(item, local_vars, allow_recursion) | |
e75bb0d6 | 156 | for item in self._separate(inner)]) |
404f611f | 157 | expr = name + outer |
158 | ||
159 | m = re.match(r'try\s*', expr) | |
160 | if m: | |
161 | if expr[m.end()] == '{': | |
e75bb0d6 | 162 | try_expr, expr = self._separate_at_paren(expr[m.end():], '}') |
404f611f | 163 | else: |
164 | try_expr, expr = expr[m.end() - 1:], '' | |
165 | ret, should_abort = self.interpret_statement(try_expr, local_vars, allow_recursion - 1) | |
166 | if should_abort: | |
167 | return ret | |
168 | return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0] | |
169 | ||
170 | m = re.match(r'catch\s*\(', expr) | |
171 | if m: | |
172 | # We ignore the catch block | |
e75bb0d6 | 173 | _, expr = self._separate_at_paren(expr, '}') |
404f611f | 174 | return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0] |
175 | ||
176 | m = re.match(r'for\s*\(', expr) | |
177 | if m: | |
e75bb0d6 | 178 | constructor, remaining = self._separate_at_paren(expr[m.end() - 1:], ')') |
404f611f | 179 | if remaining.startswith('{'): |
e75bb0d6 | 180 | body, expr = self._separate_at_paren(remaining, '}') |
404f611f | 181 | else: |
182 | m = re.match(r'switch\s*\(', remaining) # FIXME | |
183 | if m: | |
e75bb0d6 U |
184 | switch_val, remaining = self._separate_at_paren(remaining[m.end() - 1:], ')') |
185 | body, expr = self._separate_at_paren(remaining, '}') | |
404f611f | 186 | body = 'switch(%s){%s}' % (switch_val, body) |
9e3f1991 | 187 | else: |
404f611f | 188 | body, expr = remaining, '' |
e75bb0d6 | 189 | start, cndn, increment = self._separate(constructor, ';') |
404f611f | 190 | if self.interpret_statement(start, local_vars, allow_recursion - 1)[1]: |
191 | raise ExtractorError( | |
192 | f'Premature return in the initialization of a for loop in {constructor!r}') | |
193 | while True: | |
194 | if not self.interpret_expression(cndn, local_vars, allow_recursion): | |
195 | break | |
196 | try: | |
197 | ret, should_abort = self.interpret_statement(body, local_vars, allow_recursion - 1) | |
198 | if should_abort: | |
199 | return ret | |
200 | except JS_Break: | |
201 | break | |
202 | except JS_Continue: | |
203 | pass | |
204 | if self.interpret_statement(increment, local_vars, allow_recursion - 1)[1]: | |
205 | raise ExtractorError( | |
206 | f'Premature return in the initialization of a for loop in {constructor!r}') | |
207 | return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0] | |
208 | ||
209 | m = re.match(r'switch\s*\(', expr) | |
210 | if m: | |
e75bb0d6 | 211 | switch_val, remaining = self._separate_at_paren(expr[m.end() - 1:], ')') |
404f611f | 212 | switch_val = self.interpret_expression(switch_val, local_vars, allow_recursion) |
e75bb0d6 | 213 | body, expr = self._separate_at_paren(remaining, '}') |
a1fc7ca0 | 214 | items = body.replace('default:', 'case default:').split('case ')[1:] |
215 | for default in (False, True): | |
216 | matched = False | |
217 | for item in items: | |
86e5f3ed | 218 | case, stmt = (i.strip() for i in self._separate(item, ':', 1)) |
a1fc7ca0 | 219 | if default: |
220 | matched = matched or case == 'default' | |
221 | elif not matched: | |
222 | matched = case != 'default' and switch_val == self.interpret_expression(case, local_vars, allow_recursion) | |
223 | if not matched: | |
224 | continue | |
404f611f | 225 | try: |
226 | ret, should_abort = self.interpret_statement(stmt, local_vars, allow_recursion - 1) | |
227 | if should_abort: | |
228 | return ret | |
229 | except JS_Break: | |
9e3f1991 | 230 | break |
a1fc7ca0 | 231 | if matched: |
232 | break | |
404f611f | 233 | return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0] |
234 | ||
e75bb0d6 U |
235 | # Comma separated statements |
236 | sub_expressions = list(self._separate(expr)) | |
404f611f | 237 | expr = sub_expressions.pop().strip() if sub_expressions else '' |
238 | for sub_expr in sub_expressions: | |
239 | self.interpret_expression(sub_expr, local_vars, allow_recursion) | |
240 | ||
241 | for m in re.finditer(rf'''(?x) | |
242 | (?P<pre_sign>\+\+|--)(?P<var1>{_NAME_RE})| | |
243 | (?P<var2>{_NAME_RE})(?P<post_sign>\+\+|--)''', expr): | |
244 | var = m.group('var1') or m.group('var2') | |
245 | start, end = m.span() | |
246 | sign = m.group('pre_sign') or m.group('post_sign') | |
247 | ret = local_vars[var] | |
248 | local_vars[var] += 1 if sign[0] == '+' else -1 | |
249 | if m.group('pre_sign'): | |
250 | ret = local_vars[var] | |
251 | expr = expr[:start] + json.dumps(ret) + expr[end:] | |
9e3f1991 PH |
252 | |
253 | for op, opfunc in _ASSIGN_OPERATORS: | |
86e5f3ed | 254 | m = re.match(rf'''(?x) |
255 | (?P<out>{_NAME_RE})(?:\[(?P<index>[^\]]+?)\])? | |
256 | \s*{re.escape(op)} | |
257 | (?P<expr>.*)$''', expr) | |
9e3f1991 PH |
258 | if not m: |
259 | continue | |
404f611f | 260 | right_val = self.interpret_expression(m.group('expr'), local_vars, allow_recursion) |
9e3f1991 PH |
261 | |
262 | if m.groupdict().get('index'): | |
263 | lvar = local_vars[m.group('out')] | |
404f611f | 264 | idx = self.interpret_expression(m.group('index'), local_vars, allow_recursion) |
265 | if not isinstance(idx, int): | |
266 | raise ExtractorError(f'List indices must be integers: {idx}') | |
9e3f1991 PH |
267 | cur = lvar[idx] |
268 | val = opfunc(cur, right_val) | |
269 | lvar[idx] = val | |
270 | return val | |
271 | else: | |
272 | cur = local_vars.get(m.group('out')) | |
273 | val = opfunc(cur, right_val) | |
274 | local_vars[m.group('out')] = val | |
275 | return val | |
276 | ||
2b25cb5d PH |
277 | if expr.isdigit(): |
278 | return int(expr) | |
279 | ||
404f611f | 280 | if expr == 'break': |
281 | raise JS_Break() | |
282 | elif expr == 'continue': | |
283 | raise JS_Continue() | |
284 | ||
9e3f1991 | 285 | var_m = re.match( |
404f611f | 286 | r'(?!if|return|true|false|null)(?P<name>%s)$' % _NAME_RE, |
9e3f1991 PH |
287 | expr) |
288 | if var_m: | |
289 | return local_vars[var_m.group('name')] | |
2b25cb5d | 290 | |
19a03940 | 291 | with contextlib.suppress(ValueError): |
825abb81 | 292 | return json.loads(expr) |
825abb81 PH |
293 | |
294 | m = re.match( | |
7769f837 S |
295 | r'(?P<in>%s)\[(?P<idx>.+)\]$' % _NAME_RE, expr) |
296 | if m: | |
297 | val = local_vars[m.group('in')] | |
404f611f | 298 | idx = self.interpret_expression(m.group('idx'), local_vars, allow_recursion) |
7769f837 S |
299 | return val[idx] |
300 | ||
404f611f | 301 | for op, opfunc in _OPERATORS: |
e75bb0d6 U |
302 | separated = list(self._separate(expr, op)) |
303 | if len(separated) < 2: | |
404f611f | 304 | continue |
e75bb0d6 U |
305 | right_val = separated.pop() |
306 | left_val = op.join(separated) | |
404f611f | 307 | left_val, should_abort = self.interpret_statement( |
308 | left_val, local_vars, allow_recursion - 1) | |
309 | if should_abort: | |
310 | raise ExtractorError(f'Premature left-side return of {op} in {expr!r}') | |
311 | right_val, should_abort = self.interpret_statement( | |
312 | right_val, local_vars, allow_recursion - 1) | |
313 | if should_abort: | |
314 | raise ExtractorError(f'Premature right-side return of {op} in {expr!r}') | |
315 | return opfunc(left_val or 0, right_val) | |
316 | ||
7769f837 | 317 | m = re.match( |
404f611f | 318 | r'(?P<var>%s)(?:\.(?P<member>[^(]+)|\[(?P<member2>[^]]+)\])\s*' % _NAME_RE, |
825abb81 | 319 | expr) |
2b25cb5d | 320 | if m: |
825abb81 | 321 | variable = m.group('var') |
7769f837 | 322 | member = remove_quotes(m.group('member') or m.group('member2')) |
404f611f | 323 | arg_str = expr[m.end():] |
324 | if arg_str.startswith('('): | |
e75bb0d6 | 325 | arg_str, remaining = self._separate_at_paren(arg_str, ')') |
825abb81 | 326 | else: |
404f611f | 327 | arg_str, remaining = None, arg_str |
328 | ||
329 | def assertion(cndn, msg): | |
330 | """ assert, but without risk of getting optimized out """ | |
331 | if not cndn: | |
332 | raise ExtractorError(f'{member} {msg}: {expr}') | |
333 | ||
334 | def eval_method(): | |
335 | nonlocal member | |
336 | if variable == 'String': | |
337 | obj = str | |
338 | elif variable in local_vars: | |
339 | obj = local_vars[variable] | |
340 | else: | |
341 | if variable not in self._objects: | |
342 | self._objects[variable] = self.extract_object(variable) | |
343 | obj = self._objects[variable] | |
344 | ||
345 | if arg_str is None: | |
346 | # Member access | |
347 | if member == 'length': | |
348 | return len(obj) | |
349 | return obj[member] | |
350 | ||
351 | # Function call | |
352 | argvals = [ | |
825abb81 | 353 | self.interpret_expression(v, local_vars, allow_recursion) |
e75bb0d6 | 354 | for v in self._separate(arg_str)] |
404f611f | 355 | |
356 | if obj == str: | |
357 | if member == 'fromCharCode': | |
358 | assertion(argvals, 'takes one or more arguments') | |
359 | return ''.join(map(chr, argvals)) | |
360 | raise ExtractorError(f'Unsupported string method {member}') | |
361 | ||
362 | if member == 'split': | |
363 | assertion(argvals, 'takes one or more arguments') | |
364 | assertion(argvals == [''], 'with arguments is not implemented') | |
365 | return list(obj) | |
366 | elif member == 'join': | |
367 | assertion(isinstance(obj, list), 'must be applied on a list') | |
368 | assertion(len(argvals) == 1, 'takes exactly one argument') | |
369 | return argvals[0].join(obj) | |
370 | elif member == 'reverse': | |
371 | assertion(not argvals, 'does not take any arguments') | |
372 | obj.reverse() | |
373 | return obj | |
374 | elif member == 'slice': | |
375 | assertion(isinstance(obj, list), 'must be applied on a list') | |
376 | assertion(len(argvals) == 1, 'takes exactly one argument') | |
377 | return obj[argvals[0]:] | |
378 | elif member == 'splice': | |
379 | assertion(isinstance(obj, list), 'must be applied on a list') | |
380 | assertion(argvals, 'takes one or more arguments') | |
57dbe807 | 381 | index, howMany = map(int, (argvals + [len(obj)])[:2]) |
404f611f | 382 | if index < 0: |
383 | index += len(obj) | |
384 | add_items = argvals[2:] | |
385 | res = [] | |
386 | for i in range(index, min(index + howMany, len(obj))): | |
387 | res.append(obj.pop(index)) | |
388 | for i, item in enumerate(add_items): | |
389 | obj.insert(index + i, item) | |
390 | return res | |
391 | elif member == 'unshift': | |
392 | assertion(isinstance(obj, list), 'must be applied on a list') | |
393 | assertion(argvals, 'takes one or more arguments') | |
394 | for item in reversed(argvals): | |
395 | obj.insert(0, item) | |
396 | return obj | |
397 | elif member == 'pop': | |
398 | assertion(isinstance(obj, list), 'must be applied on a list') | |
399 | assertion(not argvals, 'does not take any arguments') | |
400 | if not obj: | |
401 | return | |
402 | return obj.pop() | |
403 | elif member == 'push': | |
404 | assertion(argvals, 'takes one or more arguments') | |
405 | obj.extend(argvals) | |
406 | return obj | |
407 | elif member == 'forEach': | |
408 | assertion(argvals, 'takes one or more arguments') | |
409 | assertion(len(argvals) <= 2, 'takes at-most 2 arguments') | |
410 | f, this = (argvals + [''])[:2] | |
411 | return [f((item, idx, obj), this=this) for idx, item in enumerate(obj)] | |
412 | elif member == 'indexOf': | |
413 | assertion(argvals, 'takes one or more arguments') | |
414 | assertion(len(argvals) <= 2, 'takes at-most 2 arguments') | |
415 | idx, start = (argvals + [0])[:2] | |
416 | try: | |
417 | return obj.index(idx, start) | |
418 | except ValueError: | |
419 | return -1 | |
420 | ||
421 | if isinstance(obj, list): | |
422 | member = int(member) | |
423 | return obj[member](argvals) | |
424 | ||
425 | if remaining: | |
426 | return self.interpret_expression( | |
427 | self._named_object(local_vars, eval_method()) + remaining, | |
428 | local_vars, allow_recursion) | |
429 | else: | |
430 | return eval_method() | |
2b25cb5d | 431 | |
404f611f | 432 | m = re.match(r'^(?P<func>%s)\((?P<args>[a-zA-Z0-9_$,]*)\)$' % _NAME_RE, expr) |
2b25cb5d PH |
433 | if m: |
434 | fname = m.group('func') | |
86e5f3ed | 435 | argvals = tuple( |
825abb81 | 436 | int(v) if v.isdigit() else local_vars[v] |
86e5f3ed | 437 | for v in self._separate(m.group('args'))) |
404f611f | 438 | if fname in local_vars: |
439 | return local_vars[fname](argvals) | |
440 | elif fname not in self._functions: | |
1f749b66 | 441 | self._functions[fname] = self.extract_function(fname) |
2b25cb5d | 442 | return self._functions[fname](argvals) |
9e3f1991 | 443 | |
404f611f | 444 | if expr: |
445 | raise ExtractorError('Unsupported JS expression %r' % expr) | |
2b25cb5d | 446 | |
ad25aee2 | 447 | def extract_object(self, objname): |
7769f837 | 448 | _FUNC_NAME_RE = r'''(?:[a-zA-Z$0-9]+|"[a-zA-Z$0-9]+"|'[a-zA-Z$0-9]+')''' |
ad25aee2 JMF |
449 | obj = {} |
450 | obj_m = re.search( | |
0e2d626d S |
451 | r'''(?x) |
452 | (?<!this\.)%s\s*=\s*{\s* | |
453 | (?P<fields>(%s\s*:\s*function\s*\(.*?\)\s*{.*?}(?:,\s*)?)*) | |
454 | }\s*; | |
455 | ''' % (re.escape(objname), _FUNC_NAME_RE), | |
ad25aee2 JMF |
456 | self.code) |
457 | fields = obj_m.group('fields') | |
458 | # Currently, it only supports function definitions | |
459 | fields_m = re.finditer( | |
0e2d626d S |
460 | r'''(?x) |
461 | (?P<key>%s)\s*:\s*function\s*\((?P<args>[a-z,]+)\){(?P<code>[^}]+)} | |
462 | ''' % _FUNC_NAME_RE, | |
ad25aee2 JMF |
463 | fields) |
464 | for f in fields_m: | |
465 | argnames = f.group('args').split(',') | |
7769f837 | 466 | obj[remove_quotes(f.group('key'))] = self.build_function(argnames, f.group('code')) |
ad25aee2 JMF |
467 | |
468 | return obj | |
469 | ||
404f611f | 470 | def extract_function_code(self, funcname): |
471 | """ @returns argnames, code """ | |
2b25cb5d | 472 | func_m = re.search( |
9e3f1991 | 473 | r'''(?x) |
b46eabec | 474 | (?:function\s+%s|[{;,]\s*%s\s*=\s*function|var\s+%s\s*=\s*function)\s* |
9e3f1991 | 475 | \((?P<args>[^)]*)\)\s* |
404f611f | 476 | (?P<code>\{(?:(?!};)[^"]|"([^"]|\\")*")+\})''' % ( |
ff29bf81 | 477 | re.escape(funcname), re.escape(funcname), re.escape(funcname)), |
2b25cb5d | 478 | self.code) |
e75bb0d6 | 479 | code, _ = self._separate_at_paren(func_m.group('code'), '}') # refine the match |
77ffa957 PH |
480 | if func_m is None: |
481 | raise ExtractorError('Could not find JS function %r' % funcname) | |
404f611f | 482 | return func_m.group('args').split(','), code |
2b25cb5d | 483 | |
404f611f | 484 | def extract_function(self, funcname): |
485 | return self.extract_function_from_code(*self.extract_function_code(funcname)) | |
486 | ||
487 | def extract_function_from_code(self, argnames, code, *global_stack): | |
488 | local_vars = {} | |
489 | while True: | |
490 | mobj = re.search(r'function\((?P<args>[^)]*)\)\s*{', code) | |
491 | if mobj is None: | |
492 | break | |
493 | start, body_start = mobj.span() | |
e75bb0d6 | 494 | body, remaining = self._separate_at_paren(code[body_start - 1:], '}') |
404f611f | 495 | name = self._named_object( |
496 | local_vars, | |
497 | self.extract_function_from_code( | |
498 | [str.strip(x) for x in mobj.group('args').split(',')], | |
499 | body, local_vars, *global_stack)) | |
500 | code = code[:start] + name + remaining | |
501 | return self.build_function(argnames, code, local_vars, *global_stack) | |
ad25aee2 | 502 | |
9e3f1991 | 503 | def call_function(self, funcname, *args): |
404f611f | 504 | return self.extract_function(funcname)(args) |
505 | ||
506 | def build_function(self, argnames, code, *global_stack): | |
507 | global_stack = list(global_stack) or [{}] | |
404f611f | 508 | |
509 | def resf(args, **kwargs): | |
19a03940 | 510 | global_stack[0].update({ |
404f611f | 511 | **dict(zip(argnames, args)), |
512 | **kwargs | |
513 | }) | |
19a03940 | 514 | var_stack = LocalNameSpace(*global_stack) |
e75bb0d6 | 515 | for stmt in self._separate(code.replace('\n', ''), ';'): |
404f611f | 516 | ret, should_abort = self.interpret_statement(stmt, var_stack) |
517 | if should_abort: | |
9e3f1991 | 518 | break |
404f611f | 519 | return ret |
2b25cb5d | 520 | return resf |