diff options
Diffstat (limited to 'youtube_dl/jsinterp.py')
| -rw-r--r-- | youtube_dl/jsinterp.py | 278 |
1 files changed, 185 insertions, 93 deletions
diff --git a/youtube_dl/jsinterp.py b/youtube_dl/jsinterp.py index f0c4fa928..7630e2099 100644 --- a/youtube_dl/jsinterp.py +++ b/youtube_dl/jsinterp.py @@ -240,7 +240,7 @@ def _js_ternary(cndn, if_true=True, if_false=False): def _js_unary_op(op): @wraps_op(op) - def wrapped(_, a): + def wrapped(a, _): return op(a) return wrapped @@ -283,17 +283,6 @@ _OPERATORS = ( ('**', _js_exp), ) -_COMP_OPERATORS = ( - ('===', _js_id_op(operator.is_)), - ('!==', _js_id_op(operator.is_not)), - ('==', _js_eq), - ('!=', _js_neq), - ('<=', _js_comp_op(operator.le)), - ('>=', _js_comp_op(operator.ge)), - ('<', _js_comp_op(operator.lt)), - ('>', _js_comp_op(operator.gt)), -) - _LOG_OPERATORS = ( ('|', _js_bit_op(operator.or_)), ('^', _js_bit_op(operator.xor)), @@ -310,13 +299,27 @@ _SC_OPERATORS = ( _UNARY_OPERATORS_X = ( ('void', _js_unary_op(lambda _: JS_Undefined)), ('typeof', _js_unary_op(_js_typeof)), + # avoid functools.partial here since Py2 update_wrapper(partial) -> no __module__ + ('!', _js_unary_op(lambda x: _js_ternary(x, if_true=False, if_false=True))), ) -_OPERATOR_RE = '|'.join(map(lambda x: re.escape(x[0]), _OPERATORS + _LOG_OPERATORS)) +_COMP_OPERATORS = ( + ('===', _js_id_op(operator.is_)), + ('!==', _js_id_op(operator.is_not)), + ('==', _js_eq), + ('!=', _js_neq), + ('<=', _js_comp_op(operator.le)), + ('>=', _js_comp_op(operator.ge)), + ('<', _js_comp_op(operator.lt)), + ('>', _js_comp_op(operator.gt)), +) + +_OPERATOR_RE = '|'.join(map(lambda x: re.escape(x[0]), _OPERATORS + _LOG_OPERATORS + _SC_OPERATORS)) _NAME_RE = r'[a-zA-Z_$][\w$]*' _MATCHING_PARENS = dict(zip(*zip('()', '{}', '[]'))) _QUOTES = '\'"/' +_NESTED_BRACKETS = r'[^[\]]+(?:\[[^[\]]+(?:\[[^\]]+\])?\])?' class JS_Break(ExtractorError): @@ -353,7 +356,7 @@ class LocalNameSpace(ChainMap): raise NotImplementedError('Deleting is not supported') def __repr__(self): - return 'LocalNameSpace%s' % (self.maps, ) + return 'LocalNameSpace({0!r})'.format(self.maps) class Debugger(object): @@ -374,6 +377,9 @@ class Debugger(object): @classmethod def wrap_interpreter(cls, f): + if not cls.ENABLED: + return f + @wraps(f) def interpret_statement(self, stmt, local_vars, allow_recursion, *args, **kwargs): if cls.ENABLED and stmt.strip(): @@ -414,7 +420,17 @@ class JSInterpreter(object): msg = '{0} in: {1!r:.100}'.format(msg.rstrip(), expr) super(JSInterpreter.Exception, self).__init__(msg, *args, **kwargs) - class JS_RegExp(object): + class JS_Object(object): + def __getitem__(self, key): + if hasattr(self, key): + return getattr(self, key) + raise KeyError(key) + + def dump(self): + """Serialise the instance""" + raise NotImplementedError + + class JS_RegExp(JS_Object): RE_FLAGS = { # special knowledge: Python's re flags are bitmask values, current max 128 # invent new bitmask values well above that for literal parsing @@ -435,16 +451,24 @@ class JSInterpreter(object): def __init__(self, pattern_txt, flags=0): if isinstance(flags, compat_str): flags, _ = self.regex_flags(flags) - # First, avoid https://github.com/python/cpython/issues/74534 self.__self = None pattern_txt = str_or_none(pattern_txt) or '(?:)' - self.__pattern_txt = pattern_txt.replace('[[', r'[\[') + # escape unintended embedded flags + pattern_txt = re.sub( + r'(\(\?)([aiLmsux]*)(-[imsx]+:|(?<!\?)\))', + lambda m: ''.join( + (re.escape(m.group(1)), m.group(2), re.escape(m.group(3))) + if m.group(3) == ')' + else ('(?:', m.group(2), m.group(3))), + pattern_txt) + # Avoid https://github.com/python/cpython/issues/74534 + self.source = pattern_txt.replace('[[', r'[\[') self.__flags = flags def __instantiate(self): if self.__self: return - self.__self = re.compile(self.__pattern_txt, self.__flags) + self.__self = re.compile(self.source, self.__flags) # Thx: https://stackoverflow.com/questions/44773522/setattr-on-python2-sre-sre-pattern for name in dir(self.__self): # Only these? Obviously __class__, __init__. @@ -452,16 +476,15 @@ class JSInterpreter(object): # that can't be setattr'd but also can't need to be copied. if name in ('__class__', '__init__', '__weakref__'): continue - setattr(self, name, getattr(self.__self, name)) + if name == 'flags': + setattr(self, name, getattr(self.__self, name, self.__flags)) + else: + setattr(self, name, getattr(self.__self, name)) def __getattr__(self, name): self.__instantiate() - # make Py 2.6 conform to its lying documentation - if name == 'flags': - self.flags = self.__flags - return self.flags - elif name == 'pattern': - self.pattern = self.__pattern_txt + if name == 'pattern': + self.pattern = self.source return self.pattern elif hasattr(self.__self, name): v = getattr(self.__self, name) @@ -469,6 +492,26 @@ class JSInterpreter(object): return v elif name in ('groupindex', 'groups'): return 0 if name == 'groupindex' else {} + else: + flag_attrs = ( # order by 2nd elt + ('hasIndices', 'd'), + ('global', 'g'), + ('ignoreCase', 'i'), + ('multiline', 'm'), + ('dotAll', 's'), + ('unicode', 'u'), + ('unicodeSets', 'v'), + ('sticky', 'y'), + ) + for k, c in flag_attrs: + if name == k: + return bool(self.RE_FLAGS[c] & self.__flags) + else: + if name == 'flags': + return ''.join( + (c if self.RE_FLAGS[c] & self.__flags else '') + for _, c in flag_attrs) + raise AttributeError('{0} has no attribute named {1}'.format(self, name)) @classmethod @@ -482,7 +525,16 @@ class JSInterpreter(object): flags |= cls.RE_FLAGS[ch] return flags, expr[idx + 1:] - class JS_Date(object): + def dump(self): + return '(/{0}/{1})'.format( + re.sub(r'(?<!\\)/', r'\/', self.source), + self.flags) + + @staticmethod + def escape(string_): + return re.escape(string_) + + class JS_Date(JS_Object): _t = None @staticmethod @@ -549,6 +601,9 @@ class JSInterpreter(object): def valueOf(self): return _NaN if self._t is None else self._t + def dump(self): + return '(new Date({0}))'.format(self.toString()) + @classmethod def __op_chars(cls): op_chars = set(';,[') @@ -652,6 +707,68 @@ class JSInterpreter(object): _SC_OPERATORS, _LOG_OPERATORS, _COMP_OPERATORS, _OPERATORS, _UNARY_OPERATORS_X)) return _cached + def _separate_at_op(self, expr, max_split=None): + + for op, _ in self._all_operators(): + # hackety: </> have higher priority than <</>>, but don't confuse them + skip_delim = (op + op) if op in '<>*?' else None + if op == '?': + skip_delim = (skip_delim, '?.') + separated = list(self._separate(expr, op, skip_delims=skip_delim)) + if len(separated) < 2: + continue + + right_expr = separated.pop() + # handle operators that are both unary and binary, minimal BODMAS + if op in ('+', '-'): + # simplify/adjust consecutive instances of these operators + undone = 0 + separated = [s.strip() for s in separated] + while len(separated) > 1 and not separated[-1]: + undone += 1 + separated.pop() + if op == '-' and undone % 2 != 0: + right_expr = op + right_expr + elif op == '+': + while len(separated) > 1 and set(separated[-1]) <= self.OP_CHARS: + right_expr = separated.pop() + right_expr + if separated[-1][-1:] in self.OP_CHARS: + right_expr = separated.pop() + right_expr + # hanging op at end of left => unary + (strip) or - (push right) + separated.append(right_expr) + dm_ops = ('*', '%', '/', '**') + dm_chars = set(''.join(dm_ops)) + + def yield_terms(s): + skip = False + for i, term in enumerate(s[:-1]): + if skip: + skip = False + continue + if not (dm_chars & set(term)): + yield term + continue + for dm_op in dm_ops: + bodmas = list(self._separate(term, dm_op, skip_delims=skip_delim)) + if len(bodmas) > 1 and not bodmas[-1].strip(): + bodmas[-1] = (op if op == '-' else '') + s[i + 1] + yield dm_op.join(bodmas) + skip = True + break + else: + if term: + yield term + + if not skip and s[-1]: + yield s[-1] + + separated = list(yield_terms(separated)) + right_expr = separated.pop() if len(separated) > 1 else None + expr = op.join(separated) + if right_expr is None: + continue + return op, separated, right_expr + def _operator(self, op, left_val, right_expr, expr, local_vars, allow_recursion): if op in ('||', '&&'): if (op == '&&') ^ _js_ternary(left_val): @@ -662,7 +779,7 @@ class JSInterpreter(object): elif op == '?': right_expr = _js_ternary(left_val, *self._separate(right_expr, ':', 1)) - right_val = self.interpret_expression(right_expr, local_vars, allow_recursion) + right_val = self.interpret_expression(right_expr, local_vars, allow_recursion) if right_expr else left_val opfunc = op and next((v for k, v in self._all_operators() if k == op), None) if not opfunc: return right_val @@ -686,6 +803,8 @@ class JSInterpreter(object): raise self.Exception('Cannot get index {idx!r:.100}'.format(**locals()), expr=repr(obj), cause=e) def _dump(self, obj, namespace): + if obj is JS_Undefined: + return 'undefined' try: return json.dumps(obj) except TypeError: @@ -705,51 +824,9 @@ class JSInterpreter(object): _FINALLY_RE = re.compile(r'finally\s*\{') _SWITCH_RE = re.compile(r'switch\s*\(') - def handle_operators(self, expr, local_vars, allow_recursion): - - for op, _ in self._all_operators(): - # hackety: </> have higher priority than <</>>, but don't confuse them - skip_delim = (op + op) if op in '<>*?' else None - if op == '?': - skip_delim = (skip_delim, '?.') - separated = list(self._separate(expr, op, skip_delims=skip_delim)) - if len(separated) < 2: - continue - - right_expr = separated.pop() - # handle operators that are both unary and binary, minimal BODMAS - if op in ('+', '-'): - # simplify/adjust consecutive instances of these operators - undone = 0 - separated = [s.strip() for s in separated] - while len(separated) > 1 and not separated[-1]: - undone += 1 - separated.pop() - if op == '-' and undone % 2 != 0: - right_expr = op + right_expr - elif op == '+': - while len(separated) > 1 and set(separated[-1]) <= self.OP_CHARS: - right_expr = separated.pop() + right_expr - if separated[-1][-1:] in self.OP_CHARS: - right_expr = separated.pop() + right_expr - # hanging op at end of left => unary + (strip) or - (push right) - left_val = separated[-1] if separated else '' - for dm_op in ('*', '%', '/', '**'): - bodmas = tuple(self._separate(left_val, dm_op, skip_delims=skip_delim)) - if len(bodmas) > 1 and not bodmas[-1].strip(): - expr = op.join(separated) + op + right_expr - if len(separated) > 1: - separated.pop() - right_expr = op.join((left_val, right_expr)) - else: - separated = [op.join((left_val, right_expr))] - right_expr = None - break - if right_expr is None: - continue - - left_val = self.interpret_expression(op.join(separated), local_vars, allow_recursion) - return self._operator(op, left_val, right_expr, expr, local_vars, allow_recursion), True + def _eval_operator(self, op, left_expr, right_expr, expr, local_vars, allow_recursion): + left_val = self.interpret_expression(left_expr, local_vars, allow_recursion) + return self._operator(op, left_val, right_expr, expr, local_vars, allow_recursion) @Debugger.wrap_interpreter def interpret_statement(self, stmt, local_vars, allow_recursion=100): @@ -805,15 +882,19 @@ class JSInterpreter(object): else: raise self.Exception('Unsupported object {obj:.100}'.format(**locals()), expr=expr) + # apply unary operators (see new above) for op, _ in _UNARY_OPERATORS_X: if not expr.startswith(op): continue operand = expr[len(op):] - if not operand or operand[0] != ' ': + if not operand or (op.isalpha() and operand[0] != ' '): continue - op_result = self.handle_operators(expr, local_vars, allow_recursion) - if op_result: - return op_result[0], should_return + separated = self._separate_at_op(operand, max_split=1) + if separated: + next_op, separated, right_expr = separated + separated.append(right_expr) + operand = next_op.join(separated) + return self._eval_operator(op, operand, '', expr, local_vars, allow_recursion), should_return if expr.startswith('{'): inner, outer = self._separate_at_paren(expr) @@ -1008,15 +1089,18 @@ class JSInterpreter(object): m = re.match(r'''(?x) (?P<assign> - (?P<out>{_NAME_RE})(?:\[(?P<out_idx>(?:.+?\]\s*\[)*.+?)\])?\s* + (?P<out>{_NAME_RE})(?P<out_idx>(?:\[{_NESTED_BRACKETS}\])+)?\s* (?P<op>{_OPERATOR_RE})? =(?!=)(?P<expr>.*)$ )|(?P<return> (?!if|return|true|false|null|undefined|NaN|Infinity)(?P<name>{_NAME_RE})$ - )|(?P<indexing> - (?P<in>{_NAME_RE})\[(?P<in_idx>(?:.+?\]\s*\[)*.+?)\]$ )|(?P<attribute> - (?P<var>{_NAME_RE})(?:(?P<nullish>\?)?\.(?P<member>[^(]+)|\[(?P<member2>[^\]]+)\])\s* + (?P<var>{_NAME_RE})(?: + (?P<nullish>\?)?\.(?P<member>[^(]+)| + \[(?P<member2>{_NESTED_BRACKETS})\] + )\s* + )|(?P<indexing> + (?P<in>{_NAME_RE})(?P<in_idx>\[.+\])$ )|(?P<function> (?P<fname>{_NAME_RE})\((?P<args>.*)\)$ )'''.format(**globals()), expr) @@ -1031,10 +1115,11 @@ class JSInterpreter(object): elif left_val in (None, JS_Undefined): raise self.Exception('Cannot index undefined variable ' + m.group('out'), expr=expr) - indexes = re.split(r'\]\s*\[', m.group('out_idx')) - for i, idx in enumerate(indexes, 1): + indexes = md['out_idx'] + while indexes: + idx, indexes = self._separate_at_paren(indexes) idx = self.interpret_expression(idx, local_vars, allow_recursion) - if i < len(indexes): + if indexes: left_val = self._index(left_val, idx) if isinstance(idx, float): idx = int(idx) @@ -1079,14 +1164,17 @@ class JSInterpreter(object): if md.get('indexing'): val = local_vars[m.group('in')] - for idx in re.split(r'\]\s*\[', m.group('in_idx')): + indexes = m.group('in_idx') + while indexes: + idx, indexes = self._separate_at_paren(indexes) idx = self.interpret_expression(idx, local_vars, allow_recursion) val = self._index(val, idx) return val, should_return - op_result = self.handle_operators(expr, local_vars, allow_recursion) - if op_result: - return op_result[0], should_return + separated = self._separate_at_op(expr) + if separated: + op, separated, right_expr = separated + return self._eval_operator(op, op.join(separated), right_expr, expr, local_vars, allow_recursion), should_return if md.get('attribute'): variable, member, nullish = m.group('var', 'member', 'nullish') @@ -1107,13 +1195,15 @@ class JSInterpreter(object): def eval_method(variable, member): if (variable, member) == ('console', 'debug'): if Debugger.ENABLED: - Debugger.write(self.interpret_expression('[{}]'.format(arg_str), local_vars, allow_recursion)) + Debugger.write(self.interpret_expression('[{0}]'.format(arg_str), local_vars, allow_recursion)) return types = { 'String': compat_str, 'Math': float, 'Array': list, 'Date': self.JS_Date, + 'RegExp': self.JS_RegExp, + # 'Error': self.Exception, # has no std static methods } obj = local_vars.get(variable) if obj in (JS_Undefined, None): @@ -1121,7 +1211,7 @@ class JSInterpreter(object): if obj is JS_Undefined: try: if variable not in self._objects: - self._objects[variable] = self.extract_object(variable) + self._objects[variable] = self.extract_object(variable, local_vars) obj = self._objects[variable] except self.Exception: if not nullish: @@ -1132,7 +1222,7 @@ class JSInterpreter(object): # Member access if arg_str is None: - return self._index(obj, member) + return self._index(obj, member, nullish) # Function call argvals = [ @@ -1275,7 +1365,8 @@ class JSInterpreter(object): assertion(len(argvals) == 2, 'takes exactly two arguments') # TODO: argvals[1] callable, other Py vs JS edge cases if isinstance(argvals[0], self.JS_RegExp): - count = 0 if argvals[0].flags & self.JS_RegExp.RE_FLAGS['g'] else 1 + # access JS member with Py reserved name + count = 0 if self._index(argvals[0], 'global') else 1 assertion(member != 'replaceAll' or count == 0, 'replaceAll must be called with a global RegExp') return argvals[0].sub(argvals[1], obj, count=count) @@ -1316,7 +1407,7 @@ class JSInterpreter(object): for v in self._separate(list_txt): yield self.interpret_expression(v, local_vars, allow_recursion) - def extract_object(self, objname): + def extract_object(self, objname, *global_stack): _FUNC_NAME_RE = r'''(?:{n}|"{n}"|'{n}')'''.format(n=_NAME_RE) obj = {} fields = next(filter(None, ( @@ -1337,7 +1428,8 @@ class JSInterpreter(object): fields): argnames = self.build_arglist(f.group('args')) name = remove_quotes(f.group('key')) - obj[name] = function_with_repr(self.build_function(argnames, f.group('code')), 'F<{0}>'.format(name)) + obj[name] = function_with_repr( + self.build_function(argnames, f.group('code'), *global_stack), 'F<{0}>'.format(name)) return obj |