1126 lines
45 KiB
Python
1126 lines
45 KiB
Python
from __future__ import unicode_literals
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import itertools
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import json
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import operator
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import re
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from functools import update_wrapper
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from .utils import (
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error_to_compat_str,
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ExtractorError,
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js_to_json,
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remove_quotes,
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unified_timestamp,
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variadic,
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write_string,
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)
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from .compat import (
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compat_basestring,
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compat_chr,
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compat_collections_chain_map as ChainMap,
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compat_filter as filter,
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compat_itertools_zip_longest as zip_longest,
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compat_map as map,
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compat_str,
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)
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# name JS functions
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class function_with_repr(object):
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# from yt_dlp/utils.py, but in this module
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# repr_ is always set
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def __init__(self, func, repr_):
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update_wrapper(self, func)
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self.func, self.__repr = func, repr_
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def __call__(self, *args, **kwargs):
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return self.func(*args, **kwargs)
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def __repr__(self):
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return self.__repr
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# name JS operators
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def wraps_op(op):
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def update_and_rename_wrapper(w):
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f = update_wrapper(w, op)
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# fn names are str in both Py 2/3
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f.__name__ = str('JS_') + f.__name__
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return f
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return update_and_rename_wrapper
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# NB In principle NaN cannot be checked by membership.
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# Here all NaN values are actually this one, so _NaN is _NaN,
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# although _NaN != _NaN. Ditto Infinity.
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_NaN = float('nan')
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_Infinity = float('inf')
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def _js_bit_op(op):
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def zeroise(x):
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return 0 if x in (None, JS_Undefined, _NaN, _Infinity) else x
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@wraps_op(op)
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def wrapped(a, b):
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return op(zeroise(a), zeroise(b)) & 0xffffffff
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return wrapped
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def _js_arith_op(op):
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@wraps_op(op)
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def wrapped(a, b):
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if JS_Undefined in (a, b):
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return _NaN
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return op(a or 0, b or 0)
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return wrapped
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def _js_div(a, b):
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if JS_Undefined in (a, b) or not (a or b):
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return _NaN
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return operator.truediv(a or 0, b) if b else _Infinity
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def _js_mod(a, b):
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if JS_Undefined in (a, b) or not b:
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return _NaN
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return (a or 0) % b
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def _js_exp(a, b):
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if not b:
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return 1 # even 0 ** 0 !!
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elif JS_Undefined in (a, b):
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return _NaN
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return (a or 0) ** b
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def _js_eq_op(op):
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@wraps_op(op)
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def wrapped(a, b):
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if set((a, b)) <= set((None, JS_Undefined)):
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return op(a, a)
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return op(a, b)
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return wrapped
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def _js_comp_op(op):
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@wraps_op(op)
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def wrapped(a, b):
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if JS_Undefined in (a, b):
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return False
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if isinstance(a, compat_basestring):
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b = compat_str(b or 0)
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elif isinstance(b, compat_basestring):
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a = compat_str(a or 0)
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return op(a or 0, b or 0)
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return wrapped
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def _js_ternary(cndn, if_true=True, if_false=False):
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"""Simulate JS's ternary operator (cndn?if_true:if_false)"""
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if cndn in (False, None, 0, '', JS_Undefined, _NaN):
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return if_false
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return if_true
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# (op, definition) in order of binding priority, tightest first
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# avoid dict to maintain order
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# definition None => Defined in JSInterpreter._operator
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_OPERATORS = (
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('>>', _js_bit_op(operator.rshift)),
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('<<', _js_bit_op(operator.lshift)),
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('+', _js_arith_op(operator.add)),
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('-', _js_arith_op(operator.sub)),
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('*', _js_arith_op(operator.mul)),
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('%', _js_mod),
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('/', _js_div),
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('**', _js_exp),
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)
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_COMP_OPERATORS = (
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('===', operator.is_),
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('!==', operator.is_not),
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('==', _js_eq_op(operator.eq)),
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('!=', _js_eq_op(operator.ne)),
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('<=', _js_comp_op(operator.le)),
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('>=', _js_comp_op(operator.ge)),
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('<', _js_comp_op(operator.lt)),
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('>', _js_comp_op(operator.gt)),
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)
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_LOG_OPERATORS = (
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('|', _js_bit_op(operator.or_)),
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('^', _js_bit_op(operator.xor)),
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('&', _js_bit_op(operator.and_)),
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)
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_SC_OPERATORS = (
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('?', None),
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('??', None),
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('||', None),
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('&&', None),
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)
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_OPERATOR_RE = '|'.join(map(lambda x: re.escape(x[0]), _OPERATORS + _LOG_OPERATORS))
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_NAME_RE = r'[a-zA-Z_$][\w$]*'
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_MATCHING_PARENS = dict(zip(*zip('()', '{}', '[]')))
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_QUOTES = '\'"/'
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class JS_Undefined(object):
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pass
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class JS_Break(ExtractorError):
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def __init__(self):
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ExtractorError.__init__(self, 'Invalid break')
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class JS_Continue(ExtractorError):
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def __init__(self):
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ExtractorError.__init__(self, 'Invalid continue')
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class JS_Throw(ExtractorError):
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def __init__(self, e):
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self.error = e
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ExtractorError.__init__(self, 'Uncaught exception ' + error_to_compat_str(e))
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class LocalNameSpace(ChainMap):
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def __getitem__(self, key):
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try:
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return super(LocalNameSpace, self).__getitem__(key)
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except KeyError:
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return JS_Undefined
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def __setitem__(self, key, value):
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for scope in self.maps:
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if key in scope:
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scope[key] = value
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return
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self.maps[0][key] = value
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def __delitem__(self, key):
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raise NotImplementedError('Deleting is not supported')
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def __repr__(self):
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return 'LocalNameSpace%s' % (self.maps, )
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class Debugger(object):
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ENABLED = False
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@staticmethod
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def write(*args, **kwargs):
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level = kwargs.get('level', 100)
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def truncate_string(s, left, right=0):
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if s is None or len(s) <= left + right:
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return s
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return '...'.join((s[:left - 3], s[-right:] if right else ''))
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write_string('[debug] JS: {0}{1}\n'.format(
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' ' * (100 - level),
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' '.join(truncate_string(compat_str(x), 50, 50) for x in args)))
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@classmethod
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def wrap_interpreter(cls, f):
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def interpret_statement(self, stmt, local_vars, allow_recursion, *args, **kwargs):
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if cls.ENABLED and stmt.strip():
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cls.write(stmt, level=allow_recursion)
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try:
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ret, should_ret = f(self, stmt, local_vars, allow_recursion, *args, **kwargs)
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except Exception as e:
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if cls.ENABLED:
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if isinstance(e, ExtractorError):
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e = e.orig_msg
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cls.write('=> Raises:', e, '<-|', stmt, level=allow_recursion)
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raise
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if cls.ENABLED and stmt.strip():
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if should_ret or repr(ret) != stmt:
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cls.write(['->', '=>'][should_ret], repr(ret), '<-|', stmt, level=allow_recursion)
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return ret, should_ret
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return interpret_statement
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class JSInterpreter(object):
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__named_object_counter = 0
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_OBJ_NAME = '__youtube_dl_jsinterp_obj'
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OP_CHARS = None
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def __init__(self, code, objects=None):
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self.code, self._functions = code, {}
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self._objects = {} if objects is None else objects
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if type(self).OP_CHARS is None:
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type(self).OP_CHARS = self.OP_CHARS = self.__op_chars()
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class Exception(ExtractorError):
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def __init__(self, msg, *args, **kwargs):
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expr = kwargs.pop('expr', None)
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if expr is not None:
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msg = '{0} in: {1!r:.100}'.format(msg.rstrip(), expr)
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super(JSInterpreter.Exception, self).__init__(msg, *args, **kwargs)
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class JS_RegExp(object):
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RE_FLAGS = {
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# special knowledge: Python's re flags are bitmask values, current max 128
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# invent new bitmask values well above that for literal parsing
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# TODO: execute matches with these flags (remaining: d, y)
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'd': 1024, # Generate indices for substring matches
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'g': 2048, # Global search
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'i': re.I, # Case-insensitive search
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'm': re.M, # Multi-line search
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's': re.S, # Allows . to match newline characters
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'u': re.U, # Treat a pattern as a sequence of unicode code points
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'y': 4096, # Perform a "sticky" search that matches starting at the current position in the target string
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}
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def __init__(self, pattern_txt, flags=0):
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if isinstance(flags, compat_str):
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flags, _ = self.regex_flags(flags)
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# First, avoid https://github.com/python/cpython/issues/74534
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self.__self = None
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self.__pattern_txt = pattern_txt.replace('[[', r'[\[')
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self.__flags = flags
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def __instantiate(self):
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if self.__self:
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return
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self.__self = re.compile(self.__pattern_txt, self.__flags)
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# Thx: https://stackoverflow.com/questions/44773522/setattr-on-python2-sre-sre-pattern
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for name in dir(self.__self):
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# Only these? Obviously __class__, __init__.
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# PyPy creates a __weakref__ attribute with value None
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# that can't be setattr'd but also can't need to be copied.
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if name in ('__class__', '__init__', '__weakref__'):
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continue
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setattr(self, name, getattr(self.__self, name))
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def __getattr__(self, name):
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self.__instantiate()
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# make Py 2.6 conform to its lying documentation
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if name == 'flags':
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self.flags = self.__flags
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return self.flags
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elif name == 'pattern':
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self.pattern = self.__pattern_txt
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return self.pattern
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elif hasattr(self.__self, name):
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v = getattr(self.__self, name)
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setattr(self, name, v)
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return v
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elif name in ('groupindex', 'groups'):
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return 0 if name == 'groupindex' else {}
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raise AttributeError('{0} has no attribute named {1}'.format(self, name))
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@classmethod
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def regex_flags(cls, expr):
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flags = 0
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if not expr:
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return flags, expr
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for idx, ch in enumerate(expr):
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if ch not in cls.RE_FLAGS:
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break
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flags |= cls.RE_FLAGS[ch]
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return flags, expr[idx + 1:]
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@classmethod
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def __op_chars(cls):
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op_chars = set(';,[')
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for op in cls._all_operators():
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op_chars.update(op[0])
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return op_chars
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def _named_object(self, namespace, obj):
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self.__named_object_counter += 1
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name = '%s%d' % (self._OBJ_NAME, self.__named_object_counter)
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if callable(obj) and not isinstance(obj, function_with_repr):
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obj = function_with_repr(obj, 'F<%s>' % (self.__named_object_counter, ))
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namespace[name] = obj
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return name
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@classmethod
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def _separate(cls, expr, delim=',', max_split=None, skip_delims=None):
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if not expr:
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return
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# collections.Counter() is ~10% slower in both 2.7 and 3.9
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counters = dict((k, 0) for k in _MATCHING_PARENS.values())
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start, splits, pos, delim_len = 0, 0, 0, len(delim) - 1
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in_quote, escaping, after_op, in_regex_char_group = None, False, True, False
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skipping = 0
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if skip_delims:
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skip_delims = variadic(skip_delims)
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for idx, char in enumerate(expr):
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paren_delta = 0
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if not in_quote:
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if char in _MATCHING_PARENS:
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counters[_MATCHING_PARENS[char]] += 1
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paren_delta = 1
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elif char in counters:
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counters[char] -= 1
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paren_delta = -1
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if not escaping:
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if char in _QUOTES and in_quote in (char, None):
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if in_quote or after_op or char != '/':
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in_quote = None if in_quote and not in_regex_char_group else char
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elif in_quote == '/' and char in '[]':
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in_regex_char_group = char == '['
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escaping = not escaping and in_quote and char == '\\'
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after_op = not in_quote and (char in cls.OP_CHARS or paren_delta > 0 or (after_op and char.isspace()))
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if char != delim[pos] or any(counters.values()) or in_quote:
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pos = skipping = 0
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continue
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elif skipping > 0:
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skipping -= 1
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continue
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elif pos == 0 and skip_delims:
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here = expr[idx:]
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for s in skip_delims:
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if here.startswith(s) and s:
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skipping = len(s) - 1
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break
|
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if skipping > 0:
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continue
|
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if pos < delim_len:
|
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pos += 1
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continue
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yield expr[start: idx - delim_len]
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start, pos = idx + 1, 0
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splits += 1
|
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if max_split and splits >= max_split:
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break
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yield expr[start:]
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|
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@classmethod
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|
def _separate_at_paren(cls, expr, delim=None):
|
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if delim is None:
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delim = expr and _MATCHING_PARENS[expr[0]]
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separated = list(cls._separate(expr, delim, 1))
|
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if len(separated) < 2:
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raise cls.Exception('No terminating paren {delim} in {expr!r:.5500}'.format(**locals()))
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return separated[0][1:].strip(), separated[1].strip()
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|
|
|
@staticmethod
|
|
def _all_operators(_cached=[]):
|
|
if not _cached:
|
|
_cached.extend(itertools.chain(
|
|
# Ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence
|
|
_SC_OPERATORS, _LOG_OPERATORS, _COMP_OPERATORS, _OPERATORS))
|
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return _cached
|
|
|
|
def _operator(self, op, left_val, right_expr, expr, local_vars, allow_recursion):
|
|
if op in ('||', '&&'):
|
|
if (op == '&&') ^ _js_ternary(left_val):
|
|
return left_val # short circuiting
|
|
elif op == '??':
|
|
if left_val not in (None, JS_Undefined):
|
|
return left_val
|
|
elif op == '?':
|
|
right_expr = _js_ternary(left_val, *self._separate(right_expr, ':', 1))
|
|
|
|
right_val = self.interpret_expression(right_expr, local_vars, allow_recursion)
|
|
opfunc = op and next((v for k, v in self._all_operators() if k == op), None)
|
|
if not opfunc:
|
|
return right_val
|
|
|
|
try:
|
|
# print('Eval:', opfunc.__name__, left_val, right_val)
|
|
return opfunc(left_val, right_val)
|
|
except Exception as e:
|
|
raise self.Exception('Failed to evaluate {left_val!r:.50} {op} {right_val!r:.50}'.format(**locals()), expr, cause=e)
|
|
|
|
def _index(self, obj, idx, allow_undefined=False):
|
|
if idx == 'length':
|
|
return len(obj)
|
|
try:
|
|
return obj[int(idx)] if isinstance(obj, list) else obj[idx]
|
|
except Exception as e:
|
|
if allow_undefined:
|
|
return JS_Undefined
|
|
raise self.Exception('Cannot get index {idx!r:.100}'.format(**locals()), expr=repr(obj), cause=e)
|
|
|
|
def _dump(self, obj, namespace):
|
|
try:
|
|
return json.dumps(obj)
|
|
except TypeError:
|
|
return self._named_object(namespace, obj)
|
|
|
|
# used below
|
|
_VAR_RET_THROW_RE = re.compile(r'''(?x)
|
|
(?P<var>(?:var|const|let)\s)|return(?:\s+|(?=["'])|$)|(?P<throw>throw\s+)
|
|
''')
|
|
_COMPOUND_RE = re.compile(r'''(?x)
|
|
(?P<try>try)\s*\{|
|
|
(?P<if>if)\s*\(|
|
|
(?P<switch>switch)\s*\(|
|
|
(?P<for>for)\s*\(|
|
|
(?P<while>while)\s*\(
|
|
''')
|
|
_FINALLY_RE = re.compile(r'finally\s*\{')
|
|
_SWITCH_RE = re.compile(r'switch\s*\(')
|
|
|
|
@Debugger.wrap_interpreter
|
|
def interpret_statement(self, stmt, local_vars, allow_recursion=100):
|
|
if allow_recursion < 0:
|
|
raise self.Exception('Recursion limit reached')
|
|
allow_recursion -= 1
|
|
|
|
# print('At: ' + stmt[:60])
|
|
should_return = False
|
|
# fails on (eg) if (...) stmt1; else stmt2;
|
|
sub_statements = list(self._separate(stmt, ';')) or ['']
|
|
expr = stmt = sub_statements.pop().strip()
|
|
|
|
for sub_stmt in sub_statements:
|
|
ret, should_return = self.interpret_statement(sub_stmt, local_vars, allow_recursion)
|
|
if should_return:
|
|
return ret, should_return
|
|
|
|
m = self._VAR_RET_THROW_RE.match(stmt)
|
|
if m:
|
|
expr = stmt[len(m.group(0)):].strip()
|
|
if m.group('throw'):
|
|
raise JS_Throw(self.interpret_expression(expr, local_vars, allow_recursion))
|
|
should_return = not m.group('var')
|
|
if not expr:
|
|
return None, should_return
|
|
|
|
if expr[0] in _QUOTES:
|
|
inner, outer = self._separate(expr, expr[0], 1)
|
|
if expr[0] == '/':
|
|
flags, outer = self.JS_RegExp.regex_flags(outer)
|
|
inner = self.JS_RegExp(inner[1:], flags=flags)
|
|
else:
|
|
inner = json.loads(js_to_json(inner + expr[0])) # , strict=True))
|
|
if not outer:
|
|
return inner, should_return
|
|
expr = self._named_object(local_vars, inner) + outer
|
|
|
|
new_kw, _, obj = expr.partition('new ')
|
|
if not new_kw:
|
|
for klass, konstr in (('Date', lambda x: int(unified_timestamp(x, False) * 1000)),
|
|
('RegExp', self.JS_RegExp),
|
|
('Error', self.Exception)):
|
|
if not obj.startswith(klass + '('):
|
|
continue
|
|
left, right = self._separate_at_paren(obj[len(klass):])
|
|
argvals = self.interpret_iter(left, local_vars, allow_recursion)
|
|
expr = konstr(*argvals)
|
|
if expr is None:
|
|
raise self.Exception('Failed to parse {klass} {left!r:.100}'.format(**locals()), expr=expr)
|
|
expr = self._dump(expr, local_vars) + right
|
|
break
|
|
else:
|
|
raise self.Exception('Unsupported object {obj:.100}'.format(**locals()), expr=expr)
|
|
|
|
if expr.startswith('void '):
|
|
left = self.interpret_expression(expr[5:], local_vars, allow_recursion)
|
|
return None, should_return
|
|
|
|
if expr.startswith('{'):
|
|
inner, outer = self._separate_at_paren(expr)
|
|
# try for object expression (Map)
|
|
sub_expressions = [list(self._separate(sub_expr.strip(), ':', 1)) for sub_expr in self._separate(inner)]
|
|
if all(len(sub_expr) == 2 for sub_expr in sub_expressions):
|
|
return dict(
|
|
(key_expr if re.match(_NAME_RE, key_expr) else key_expr,
|
|
self.interpret_expression(val_expr, local_vars, allow_recursion))
|
|
for key_expr, val_expr in sub_expressions), should_return
|
|
# or statement list
|
|
inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion)
|
|
if not outer or should_abort:
|
|
return inner, should_abort or should_return
|
|
else:
|
|
expr = self._dump(inner, local_vars) + outer
|
|
|
|
if expr.startswith('('):
|
|
m = re.match(r'\((?P<d>[a-z])%(?P<e>[a-z])\.length\+(?P=e)\.length\)%(?P=e)\.length', expr)
|
|
if m:
|
|
# short-cut eval of frequently used `(d%e.length+e.length)%e.length`, worth ~6% on `pytest -k test_nsig`
|
|
outer = None
|
|
inner, should_abort = self._offset_e_by_d(m.group('d'), m.group('e'), local_vars)
|
|
else:
|
|
inner, outer = self._separate_at_paren(expr)
|
|
inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion)
|
|
if not outer or should_abort:
|
|
return inner, should_abort or should_return
|
|
else:
|
|
expr = self._dump(inner, local_vars) + outer
|
|
|
|
if expr.startswith('['):
|
|
inner, outer = self._separate_at_paren(expr)
|
|
name = self._named_object(local_vars, [
|
|
self.interpret_expression(item, local_vars, allow_recursion)
|
|
for item in self._separate(inner)])
|
|
expr = name + outer
|
|
|
|
m = self._COMPOUND_RE.match(expr)
|
|
md = m.groupdict() if m else {}
|
|
if md.get('if'):
|
|
cndn, expr = self._separate_at_paren(expr[m.end() - 1:])
|
|
if expr.startswith('{'):
|
|
if_expr, expr = self._separate_at_paren(expr)
|
|
else:
|
|
# may lose ... else ... because of ll.368-374
|
|
if_expr, expr = self._separate_at_paren(expr, delim=';')
|
|
else_expr = None
|
|
m = re.match(r'else\s*(?P<block>\{)?', expr)
|
|
if m:
|
|
if m.group('block'):
|
|
else_expr, expr = self._separate_at_paren(expr[m.end() - 1:])
|
|
else:
|
|
# handle subset ... else if (...) {...} else ...
|
|
# TODO: make interpret_statement do this properly, if possible
|
|
exprs = list(self._separate(expr[m.end():], delim='}', max_split=2))
|
|
if len(exprs) > 1:
|
|
if re.match(r'\s*if\s*\(', exprs[0]) and re.match(r'\s*else\b', exprs[1]):
|
|
else_expr = exprs[0] + '}' + exprs[1]
|
|
expr = (exprs[2] + '}') if len(exprs) == 3 else None
|
|
else:
|
|
else_expr = exprs[0]
|
|
exprs.append('')
|
|
expr = '}'.join(exprs[1:])
|
|
else:
|
|
else_expr = exprs[0]
|
|
expr = None
|
|
else_expr = else_expr.lstrip() + '}'
|
|
cndn = _js_ternary(self.interpret_expression(cndn, local_vars, allow_recursion))
|
|
ret, should_abort = self.interpret_statement(
|
|
if_expr if cndn else else_expr, local_vars, allow_recursion)
|
|
if should_abort:
|
|
return ret, True
|
|
|
|
elif md.get('try'):
|
|
try_expr, expr = self._separate_at_paren(expr[m.end() - 1:])
|
|
err = None
|
|
try:
|
|
ret, should_abort = self.interpret_statement(try_expr, local_vars, allow_recursion)
|
|
if should_abort:
|
|
return ret, True
|
|
except Exception as e:
|
|
# XXX: This works for now, but makes debugging future issues very hard
|
|
err = e
|
|
|
|
pending = (None, False)
|
|
m = re.match(r'catch\s*(?P<err>\(\s*{_NAME_RE}\s*\))?\{{'.format(**globals()), expr)
|
|
if m:
|
|
sub_expr, expr = self._separate_at_paren(expr[m.end() - 1:])
|
|
if err:
|
|
catch_vars = {}
|
|
if m.group('err'):
|
|
catch_vars[m.group('err')] = err.error if isinstance(err, JS_Throw) else err
|
|
catch_vars = local_vars.new_child(m=catch_vars)
|
|
err, pending = None, self.interpret_statement(sub_expr, catch_vars, allow_recursion)
|
|
|
|
m = self._FINALLY_RE.match(expr)
|
|
if m:
|
|
sub_expr, expr = self._separate_at_paren(expr[m.end() - 1:])
|
|
ret, should_abort = self.interpret_statement(sub_expr, local_vars, allow_recursion)
|
|
if should_abort:
|
|
return ret, True
|
|
|
|
ret, should_abort = pending
|
|
if should_abort:
|
|
return ret, True
|
|
|
|
if err:
|
|
raise err
|
|
|
|
elif md.get('for') or md.get('while'):
|
|
init_or_cond, remaining = self._separate_at_paren(expr[m.end() - 1:])
|
|
if remaining.startswith('{'):
|
|
body, expr = self._separate_at_paren(remaining)
|
|
else:
|
|
switch_m = self._SWITCH_RE.match(remaining) # FIXME
|
|
if switch_m:
|
|
switch_val, remaining = self._separate_at_paren(remaining[switch_m.end() - 1:])
|
|
body, expr = self._separate_at_paren(remaining, '}')
|
|
body = 'switch(%s){%s}' % (switch_val, body)
|
|
else:
|
|
body, expr = remaining, ''
|
|
if md.get('for'):
|
|
start, cndn, increment = self._separate(init_or_cond, ';')
|
|
self.interpret_expression(start, local_vars, allow_recursion)
|
|
else:
|
|
cndn, increment = init_or_cond, None
|
|
while _js_ternary(self.interpret_expression(cndn, local_vars, allow_recursion)):
|
|
try:
|
|
ret, should_abort = self.interpret_statement(body, local_vars, allow_recursion)
|
|
if should_abort:
|
|
return ret, True
|
|
except JS_Break:
|
|
break
|
|
except JS_Continue:
|
|
pass
|
|
if increment:
|
|
self.interpret_expression(increment, local_vars, allow_recursion)
|
|
|
|
elif md.get('switch'):
|
|
switch_val, remaining = self._separate_at_paren(expr[m.end() - 1:])
|
|
switch_val = self.interpret_expression(switch_val, local_vars, allow_recursion)
|
|
body, expr = self._separate_at_paren(remaining, '}')
|
|
items = body.replace('default:', 'case default:').split('case ')[1:]
|
|
for default in (False, True):
|
|
matched = False
|
|
for item in items:
|
|
case, stmt = (i.strip() for i in self._separate(item, ':', 1))
|
|
if default:
|
|
matched = matched or case == 'default'
|
|
elif not matched:
|
|
matched = (case != 'default'
|
|
and switch_val == self.interpret_expression(case, local_vars, allow_recursion))
|
|
if not matched:
|
|
continue
|
|
try:
|
|
ret, should_abort = self.interpret_statement(stmt, local_vars, allow_recursion)
|
|
if should_abort:
|
|
return ret
|
|
except JS_Break:
|
|
break
|
|
if matched:
|
|
break
|
|
|
|
if md:
|
|
ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
|
|
return ret, should_abort or should_return
|
|
|
|
# Comma separated statements
|
|
sub_expressions = list(self._separate(expr))
|
|
if len(sub_expressions) > 1:
|
|
for sub_expr in sub_expressions:
|
|
ret, should_abort = self.interpret_statement(sub_expr, local_vars, allow_recursion)
|
|
if should_abort:
|
|
return ret, True
|
|
return ret, False
|
|
|
|
for m in re.finditer(r'''(?x)
|
|
(?P<pre_sign>\+\+|--)(?P<var1>{_NAME_RE})|
|
|
(?P<var2>{_NAME_RE})(?P<post_sign>\+\+|--)'''.format(**globals()), expr):
|
|
var = m.group('var1') or m.group('var2')
|
|
start, end = m.span()
|
|
sign = m.group('pre_sign') or m.group('post_sign')
|
|
ret = local_vars[var]
|
|
local_vars[var] += 1 if sign[0] == '+' else -1
|
|
if m.group('pre_sign'):
|
|
ret = local_vars[var]
|
|
expr = expr[:start] + self._dump(ret, local_vars) + expr[end:]
|
|
|
|
if not expr:
|
|
return None, should_return
|
|
|
|
m = re.match(r'''(?x)
|
|
(?P<assign>
|
|
(?P<out>{_NAME_RE})(?:\[(?P<index>[^\]]+?)\])?\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})\[(?P<idx>.+)\]$
|
|
)|(?P<attribute>
|
|
(?P<var>{_NAME_RE})(?:(?P<nullish>\?)?\.(?P<member>[^(]+)|\[(?P<member2>[^\]]+)\])\s*
|
|
)|(?P<function>
|
|
(?P<fname>{_NAME_RE})\((?P<args>.*)\)$
|
|
)'''.format(**globals()), expr)
|
|
md = m.groupdict() if m else {}
|
|
if md.get('assign'):
|
|
left_val = local_vars.get(m.group('out'))
|
|
|
|
if not m.group('index'):
|
|
local_vars[m.group('out')] = self._operator(
|
|
m.group('op'), left_val, m.group('expr'), expr, local_vars, allow_recursion)
|
|
return local_vars[m.group('out')], should_return
|
|
elif left_val in (None, JS_Undefined):
|
|
raise self.Exception('Cannot index undefined variable ' + m.group('out'), expr=expr)
|
|
|
|
idx = self.interpret_expression(m.group('index'), local_vars, allow_recursion)
|
|
if not isinstance(idx, (int, float)):
|
|
raise self.Exception('List index %s must be integer' % (idx, ), expr=expr)
|
|
idx = int(idx)
|
|
left_val[idx] = self._operator(
|
|
m.group('op'), self._index(left_val, idx), m.group('expr'), expr, local_vars, allow_recursion)
|
|
return left_val[idx], should_return
|
|
|
|
elif expr.isdigit():
|
|
return int(expr), should_return
|
|
|
|
elif expr == 'break':
|
|
raise JS_Break()
|
|
elif expr == 'continue':
|
|
raise JS_Continue()
|
|
elif expr == 'undefined':
|
|
return JS_Undefined, should_return
|
|
elif expr == 'NaN':
|
|
return _NaN, should_return
|
|
elif expr == 'Infinity':
|
|
return _Infinity, should_return
|
|
|
|
elif md.get('return'):
|
|
return local_vars[m.group('name')], should_return
|
|
|
|
try:
|
|
ret = json.loads(js_to_json(expr)) # strict=True)
|
|
if not md.get('attribute'):
|
|
return ret, should_return
|
|
except ValueError:
|
|
pass
|
|
|
|
if md.get('indexing'):
|
|
val = local_vars[m.group('in')]
|
|
idx = self.interpret_expression(m.group('idx'), local_vars, allow_recursion)
|
|
return self._index(val, idx), should_return
|
|
|
|
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), should_return
|
|
|
|
if md.get('attribute'):
|
|
variable, member, nullish = m.group('var', 'member', 'nullish')
|
|
if not member:
|
|
member = self.interpret_expression(m.group('member2'), local_vars, allow_recursion)
|
|
arg_str = expr[m.end():]
|
|
if arg_str.startswith('('):
|
|
arg_str, remaining = self._separate_at_paren(arg_str)
|
|
else:
|
|
arg_str, remaining = None, arg_str
|
|
|
|
def assertion(cndn, msg):
|
|
""" assert, but without risk of getting optimized out """
|
|
if not cndn:
|
|
memb = member
|
|
raise self.Exception('{memb} {msg}'.format(**locals()), expr=expr)
|
|
|
|
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))
|
|
return
|
|
types = {
|
|
'String': compat_str,
|
|
'Math': float,
|
|
'Array': list,
|
|
}
|
|
obj = local_vars.get(variable)
|
|
if obj in (JS_Undefined, None):
|
|
obj = types.get(variable, JS_Undefined)
|
|
if obj is JS_Undefined:
|
|
try:
|
|
if variable not in self._objects:
|
|
self._objects[variable] = self.extract_object(variable)
|
|
obj = self._objects[variable]
|
|
except self.Exception:
|
|
if not nullish:
|
|
raise
|
|
|
|
if nullish and obj is JS_Undefined:
|
|
return JS_Undefined
|
|
|
|
# Member access
|
|
if arg_str is None:
|
|
return self._index(obj, member, nullish)
|
|
|
|
# Function call
|
|
argvals = [
|
|
self.interpret_expression(v, local_vars, allow_recursion)
|
|
for v in self._separate(arg_str)]
|
|
|
|
# Fixup prototype call
|
|
if isinstance(obj, type):
|
|
new_member, rest = member.partition('.')[0::2]
|
|
if new_member == 'prototype':
|
|
new_member, func_prototype = rest.partition('.')[0::2]
|
|
assertion(argvals, 'takes one or more arguments')
|
|
assertion(isinstance(argvals[0], obj), 'must bind to type {0}'.format(obj))
|
|
if func_prototype == 'call':
|
|
obj = argvals.pop(0)
|
|
elif func_prototype == 'apply':
|
|
assertion(len(argvals) == 2, 'takes two arguments')
|
|
obj, argvals = argvals
|
|
assertion(isinstance(argvals, list), 'second argument must be a list')
|
|
else:
|
|
raise self.Exception('Unsupported Function method ' + func_prototype, expr)
|
|
member = new_member
|
|
|
|
if obj is compat_str:
|
|
if member == 'fromCharCode':
|
|
assertion(argvals, 'takes one or more arguments')
|
|
return ''.join(map(compat_chr, argvals))
|
|
raise self.Exception('Unsupported string method ' + member, expr=expr)
|
|
elif obj is float:
|
|
if member == 'pow':
|
|
assertion(len(argvals) == 2, 'takes two arguments')
|
|
return argvals[0] ** argvals[1]
|
|
raise self.Exception('Unsupported Math method ' + member, expr=expr)
|
|
|
|
if member == 'split':
|
|
assertion(argvals, 'takes one or more arguments')
|
|
assertion(len(argvals) == 1, 'with limit argument is not implemented')
|
|
return obj.split(argvals[0]) if argvals[0] else list(obj)
|
|
elif member == 'join':
|
|
assertion(isinstance(obj, list), 'must be applied on a list')
|
|
assertion(len(argvals) == 1, 'takes exactly one argument')
|
|
return argvals[0].join(obj)
|
|
elif member == 'reverse':
|
|
assertion(not argvals, 'does not take any arguments')
|
|
obj.reverse()
|
|
return obj
|
|
elif member == 'slice':
|
|
assertion(isinstance(obj, list), 'must be applied on a list')
|
|
assertion(len(argvals) == 1, 'takes exactly one argument')
|
|
return obj[argvals[0]:]
|
|
elif member == 'splice':
|
|
assertion(isinstance(obj, list), 'must be applied on a list')
|
|
assertion(argvals, 'takes one or more arguments')
|
|
index, how_many = map(int, (argvals + [len(obj)])[:2])
|
|
if index < 0:
|
|
index += len(obj)
|
|
add_items = argvals[2:]
|
|
res = []
|
|
for _ in range(index, min(index + how_many, len(obj))):
|
|
res.append(obj.pop(index))
|
|
for i, item in enumerate(add_items):
|
|
obj.insert(index + i, item)
|
|
return res
|
|
elif member == 'unshift':
|
|
assertion(isinstance(obj, list), 'must be applied on a list')
|
|
assertion(argvals, 'takes one or more arguments')
|
|
for item in reversed(argvals):
|
|
obj.insert(0, item)
|
|
return obj
|
|
elif member == 'pop':
|
|
assertion(isinstance(obj, list), 'must be applied on a list')
|
|
assertion(not argvals, 'does not take any arguments')
|
|
if not obj:
|
|
return
|
|
return obj.pop()
|
|
elif member == 'push':
|
|
assertion(argvals, 'takes one or more arguments')
|
|
obj.extend(argvals)
|
|
return obj
|
|
elif member == 'forEach':
|
|
assertion(argvals, 'takes one or more arguments')
|
|
assertion(len(argvals) <= 2, 'takes at-most 2 arguments')
|
|
f, this = (argvals + [''])[:2]
|
|
return [f((item, idx, obj), {'this': this}, allow_recursion) for idx, item in enumerate(obj)]
|
|
elif member == 'indexOf':
|
|
assertion(argvals, 'takes one or more arguments')
|
|
assertion(len(argvals) <= 2, 'takes at-most 2 arguments')
|
|
idx, start = (argvals + [0])[:2]
|
|
try:
|
|
return obj.index(idx, start)
|
|
except ValueError:
|
|
return -1
|
|
elif member == 'charCodeAt':
|
|
assertion(isinstance(obj, compat_str), 'must be applied on a string')
|
|
# assertion(len(argvals) == 1, 'takes exactly one argument') # but not enforced
|
|
idx = argvals[0] if isinstance(argvals[0], int) else 0
|
|
if idx >= len(obj):
|
|
return None
|
|
return ord(obj[idx])
|
|
elif member in ('replace', 'replaceAll'):
|
|
assertion(isinstance(obj, compat_str), 'must be applied on a string')
|
|
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
|
|
assertion(member != 'replaceAll' or count == 0,
|
|
'replaceAll must be called with a global RegExp')
|
|
return argvals[0].sub(argvals[1], obj, count=count)
|
|
count = ('replaceAll', 'replace').index(member)
|
|
return re.sub(re.escape(argvals[0]), argvals[1], obj, count=count)
|
|
|
|
idx = int(member) if isinstance(obj, list) else member
|
|
return obj[idx](argvals, allow_recursion=allow_recursion)
|
|
|
|
if remaining:
|
|
ret, should_abort = self.interpret_statement(
|
|
self._named_object(local_vars, eval_method(variable, member)) + remaining,
|
|
local_vars, allow_recursion)
|
|
return ret, should_return or should_abort
|
|
else:
|
|
return eval_method(variable, member), should_return
|
|
|
|
elif md.get('function'):
|
|
fname = m.group('fname')
|
|
argvals = [self.interpret_expression(v, local_vars, allow_recursion)
|
|
for v in self._separate(m.group('args'))]
|
|
if fname in local_vars:
|
|
return local_vars[fname](argvals, allow_recursion=allow_recursion), should_return
|
|
elif fname not in self._functions:
|
|
self._functions[fname] = self.extract_function(fname)
|
|
return self._functions[fname](argvals, allow_recursion=allow_recursion), should_return
|
|
|
|
raise self.Exception(
|
|
'Unsupported JS expression ' + (expr[:40] if expr != stmt else ''), expr=stmt)
|
|
|
|
def interpret_expression(self, expr, local_vars, allow_recursion):
|
|
ret, should_return = self.interpret_statement(expr, local_vars, allow_recursion)
|
|
if should_return:
|
|
raise self.Exception('Cannot return from an expression', expr)
|
|
return ret
|
|
|
|
def interpret_iter(self, list_txt, local_vars, allow_recursion):
|
|
for v in self._separate(list_txt):
|
|
yield self.interpret_expression(v, local_vars, allow_recursion)
|
|
|
|
def extract_object(self, objname):
|
|
_FUNC_NAME_RE = r'''(?:[a-zA-Z$0-9]+|"[a-zA-Z$0-9]+"|'[a-zA-Z$0-9]+')'''
|
|
obj = {}
|
|
fields = next(filter(None, (
|
|
obj_m.group('fields') for obj_m in re.finditer(
|
|
r'''(?xs)
|
|
{0}\s*\.\s*{1}|{1}\s*=\s*\{{\s*
|
|
(?P<fields>({2}\s*:\s*function\s*\(.*?\)\s*\{{.*?}}(?:,\s*)?)*)
|
|
}}\s*;
|
|
'''.format(_NAME_RE, re.escape(objname), _FUNC_NAME_RE),
|
|
self.code))), None)
|
|
if not fields:
|
|
raise self.Exception('Could not find object ' + objname)
|
|
# Currently, it only supports function definitions
|
|
for f in re.finditer(
|
|
r'''(?x)
|
|
(?P<key>%s)\s*:\s*function\s*\((?P<args>(?:%s|,)*)\){(?P<code>[^}]+)}
|
|
''' % (_FUNC_NAME_RE, _NAME_RE),
|
|
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))
|
|
|
|
return obj
|
|
|
|
@staticmethod
|
|
def _offset_e_by_d(d, e, local_vars):
|
|
""" Short-cut eval: (d%e.length+e.length)%e.length """
|
|
try:
|
|
d = local_vars[d]
|
|
e = local_vars[e]
|
|
e = len(e)
|
|
return _js_mod(_js_mod(d, e) + e, e), False
|
|
except Exception:
|
|
return None, True
|
|
|
|
def extract_function_code(self, funcname):
|
|
""" @returns argnames, code """
|
|
func_m = re.search(
|
|
r'''(?xs)
|
|
(?:
|
|
function\s+%(name)s|
|
|
[{;,]\s*%(name)s\s*=\s*function|
|
|
(?:var|const|let)\s+%(name)s\s*=\s*function
|
|
)\s*
|
|
\((?P<args>[^)]*)\)\s*
|
|
(?P<code>{.+})''' % {'name': re.escape(funcname)},
|
|
self.code)
|
|
if func_m is None:
|
|
raise self.Exception('Could not find JS function "{funcname}"'.format(**locals()))
|
|
code, _ = self._separate_at_paren(func_m.group('code')) # refine the match
|
|
return self.build_arglist(func_m.group('args')), code
|
|
|
|
def extract_function(self, funcname):
|
|
return function_with_repr(
|
|
self.extract_function_from_code(*self.extract_function_code(funcname)),
|
|
'F<%s>' % (funcname,))
|
|
|
|
def extract_function_from_code(self, argnames, code, *global_stack):
|
|
local_vars = {}
|
|
while True:
|
|
mobj = re.search(r'function\((?P<args>[^)]*)\)\s*{', code)
|
|
if mobj is None:
|
|
break
|
|
start, body_start = mobj.span()
|
|
body, remaining = self._separate_at_paren(code[body_start - 1:])
|
|
name = self._named_object(local_vars, self.extract_function_from_code(
|
|
[x.strip() for x in mobj.group('args').split(',')],
|
|
body, local_vars, *global_stack))
|
|
code = code[:start] + name + remaining
|
|
return self.build_function(argnames, code, local_vars, *global_stack)
|
|
|
|
def call_function(self, funcname, *args):
|
|
return self.extract_function(funcname)(args)
|
|
|
|
@classmethod
|
|
def build_arglist(cls, arg_text):
|
|
if not arg_text:
|
|
return []
|
|
|
|
def valid_arg(y):
|
|
y = y.strip()
|
|
if not y:
|
|
raise cls.Exception('Missing arg in "%s"' % (arg_text, ))
|
|
return y
|
|
|
|
return [valid_arg(x) for x in cls._separate(arg_text)]
|
|
|
|
def build_function(self, argnames, code, *global_stack):
|
|
global_stack = list(global_stack) or [{}]
|
|
argnames = tuple(argnames)
|
|
|
|
def resf(args, kwargs={}, allow_recursion=100):
|
|
global_stack[0].update(zip_longest(argnames, args, fillvalue=None))
|
|
global_stack[0].update(kwargs)
|
|
var_stack = LocalNameSpace(*global_stack)
|
|
ret, should_abort = self.interpret_statement(code.replace('\n', ' '), var_stack, allow_recursion - 1)
|
|
if should_abort:
|
|
return ret
|
|
return resf
|