[jsinterp] Clean up and pull yt-dlp style
* add compat_re_Pattern * improve compat_collections_chain_map * use class JS_Undefined * remove unused code
This commit is contained in:
dirkf
parent
538ec65ba7
commit
46b8ae2f52
@ -11,8 +11,9 @@ sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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import math
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import re
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from youtube_dl.jsinterp import JSInterpreter
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undefined = JSInterpreter.undefined
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from youtube_dl.compat import compat_re_Pattern
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from youtube_dl.jsinterp import JS_Undefined, JSInterpreter
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class TestJSInterpreter(unittest.TestCase):
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@ -261,12 +262,12 @@ class TestJSInterpreter(unittest.TestCase):
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jsi = JSInterpreter('''
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function x() { return undefined; }
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''')
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self.assertIs(jsi.call_function('x'), undefined)
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self.assertIs(jsi.call_function('x'), JS_Undefined)
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jsi = JSInterpreter('''
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function x() { let v; return v; }
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''')
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self.assertIs(jsi.call_function('x'), undefined)
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self.assertIs(jsi.call_function('x'), JS_Undefined)
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jsi = JSInterpreter('''
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function x() { return [undefined === undefined, undefined == undefined, undefined < undefined, undefined > undefined]; }
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@ -307,7 +308,7 @@ class TestJSInterpreter(unittest.TestCase):
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jsi = JSInterpreter('''
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function x() { let v; return [v>42, v<=42, v&&42, 42&&v]; }
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''')
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self.assertEqual(jsi.call_function('x'), [False, False, undefined, undefined])
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self.assertEqual(jsi.call_function('x'), [False, False, JS_Undefined, JS_Undefined])
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jsi = JSInterpreter('function x(){return undefined ?? 42; }')
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self.assertEqual(jsi.call_function('x'), 42)
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@ -326,12 +327,12 @@ class TestJSInterpreter(unittest.TestCase):
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jsi = JSInterpreter('''
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function x() { let a; return a?.qq; }
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''')
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self.assertIs(jsi.call_function('x'), undefined)
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self.assertIs(jsi.call_function('x'), JS_Undefined)
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jsi = JSInterpreter('''
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function x() { let a = {m1: 42, m2: 0 }; return a?.qq; }
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''')
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self.assertIs(jsi.call_function('x'), undefined)
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self.assertIs(jsi.call_function('x'), JS_Undefined)
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def test_regex(self):
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jsi = JSInterpreter('''
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@ -342,13 +343,12 @@ class TestJSInterpreter(unittest.TestCase):
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jsi = JSInterpreter('''
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function x() { let a=/,,[/,913,/](,)}/; return a; }
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''')
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# Pythons disagree on the type of a pattern
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self.assertTrue(isinstance(jsi.call_function('x'), type(re.compile(''))))
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self.assertIsInstance(jsi.call_function('x'), compat_re_Pattern)
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jsi = JSInterpreter('''
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function x() { let a=/,,[/,913,/](,)}/i; return a; }
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''')
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self.assertEqual(jsi.call_function('x').flags & re.I, re.I)
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self.assertEqual(jsi.call_function('x').flags & ~re.U, re.I)
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if __name__ == '__main__':
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@ -12,10 +12,11 @@ import io
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import re
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import string
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from youtube_dl.compat import compat_str, compat_urlretrieve
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from test.helper import FakeYDL
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from youtube_dl.extractor import YoutubeIE
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from youtube_dl.jsinterp import JSInterpreter
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from youtube_dl.compat import compat_str, compat_urlretrieve
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_SIG_TESTS = [
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(
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@ -3023,18 +3023,34 @@ except ImportError:
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self.maps[0].__setitem__(k, v)
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return
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def __delitem__(self, k):
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def __contains__(self, k):
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return any((k in m) for m in self.maps)
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def __delitem(self, k):
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if k in self.maps[0]:
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del self.maps[0][k]
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return
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raise KeyError(k)
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def __delitem__(self, k):
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self.__delitem(k)
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def __iter__(self):
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return itertools.chain(*reversed(self.maps))
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def __len__(self):
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return len(iter(self))
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# to match Py3, don't del directly
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def pop(self, k, *args):
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if self.__contains__(k):
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off = self.__getitem__(k)
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self.__delitem(k)
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return off
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elif len(args) > 0:
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return args[0]
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raise KeyError(k)
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def new_child(self, m=None, **kwargs):
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m = m or {}
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m.update(kwargs)
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@ -3044,6 +3060,8 @@ except ImportError:
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def parents(self):
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return compat_collections_chain_map(*(self.maps[1:]))
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# Pythons disagree on the type of a pattern (RegexObject, _sre.SRE_Pattern, Pattern, ...?)
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compat_re_Pattern = type(re.compile(''))
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if sys.version_info < (3, 3):
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def compat_b64decode(s, *args, **kwargs):
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@ -3110,6 +3128,7 @@ __all__ = [
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'compat_os_name',
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'compat_parse_qs',
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'compat_print',
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'compat_re_Pattern',
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'compat_realpath',
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'compat_setenv',
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'compat_shlex_quote',
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@ -19,16 +19,12 @@ from .compat import (
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compat_str,
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)
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_NAME_RE = r'[a-zA-Z_$][\w$]*'
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_UNDEFINED = object()
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def _js_bit_op(op):
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def wrapped(a, b):
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def zeroise(x):
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return 0 if x in (None, _UNDEFINED) else x
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return 0 if x in (None, JS_Undefined) else x
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return op(zeroise(a), zeroise(b))
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return wrapped
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@ -37,7 +33,7 @@ def _js_bit_op(op):
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def _js_arith_op(op):
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def wrapped(a, b):
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if _UNDEFINED in (a, b):
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if JS_Undefined in (a, b):
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return float('nan')
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return op(a or 0, b or 0)
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@ -45,22 +41,21 @@ def _js_arith_op(op):
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def _js_div(a, b):
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if _UNDEFINED in (a, b) or not (a and b):
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if JS_Undefined in (a, b) or not (a and b):
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return float('nan')
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return float('inf') if not b else operator.truediv(a or 0, b)
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def _js_mod(a, b):
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if _UNDEFINED in (a, b) or not b:
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if JS_Undefined in (a, b) or not b:
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return float('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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# even 0 ** 0 !!
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return 1
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if _UNDEFINED in (a, 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 float('nan')
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return (a or 0) ** b
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@ -68,7 +63,7 @@ def _js_exp(a, b):
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def _js_eq_op(op):
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def wrapped(a, b):
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if set((a, b)) <= set((None, _UNDEFINED)):
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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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@ -78,21 +73,28 @@ def _js_eq_op(op):
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def _js_comp_op(op):
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def wrapped(a, b):
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if _UNDEFINED in (a, b):
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if JS_Undefined in (a, b):
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return False
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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):
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return if_false
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try:
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if math.isnan(cndn): # NB: NaN cannot be checked by membership
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return if_false
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except TypeError:
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pass
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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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_DOT_OPERATORS = (
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('.', None),
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# TODO: ('?.', None),
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)
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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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@ -130,20 +132,13 @@ _SC_OPERATORS = (
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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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def _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, '', _UNDEFINED):
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return if_false
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try:
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if math.isnan(cndn): # NB: NaN cannot be checked by membership
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return if_false
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except TypeError:
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pass
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return if_true
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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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@ -167,7 +162,7 @@ class LocalNameSpace(ChainMap):
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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 _UNDEFINED
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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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@ -179,24 +174,6 @@ class LocalNameSpace(ChainMap):
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def __delitem__(self, key):
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raise NotImplementedError('Deleting is not supported')
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# except
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def pop(self, key, *args):
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try:
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off = self.__getitem__(key)
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super(LocalNameSpace, self).__delitem__(key)
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return off
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except KeyError:
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if len(args) > 0:
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return args[0]
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raise
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def __contains__(self, key):
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try:
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super(LocalNameSpace, self).__getitem__(key)
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return True
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except KeyError:
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return False
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def __repr__(self):
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return 'LocalNameSpace%s' % (self.maps, )
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@ -204,9 +181,7 @@ class LocalNameSpace(ChainMap):
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class JSInterpreter(object):
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__named_object_counter = 0
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undefined = _UNDEFINED
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RE_FLAGS = {
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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: new pattern class to execute matches with these flags
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@ -257,10 +232,10 @@ class JSInterpreter(object):
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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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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:] if idx > 0 else expr
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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 _separate(cls, expr, delim=',', max_split=None, skip_delims=None):
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@ -283,14 +258,6 @@ class JSInterpreter(object):
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if not escaping and 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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if in_quote is None and char == '/' and delim != '/':
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# regexp flags
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n_idx = idx + 1
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while n_idx < len(expr) and expr[n_idx] in cls.RE_FLAGS:
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n_idx += 1
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skip_re = n_idx - idx - 1
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if skip_re > 0:
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continue
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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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@ -336,13 +303,13 @@ class JSInterpreter(object):
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def _operator(self, op, left_val, right_expr, expr, local_vars, allow_recursion):
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if op in ('||', '&&'):
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if (op == '&&') ^ _ternary(left_val):
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if (op == '&&') ^ _js_ternary(left_val):
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return left_val # short circuiting
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elif op == '??':
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if left_val not in (None, self.undefined):
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if left_val not in (None, JS_Undefined):
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return left_val
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elif op == '?':
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right_expr = _ternary(left_val, *self._separate(right_expr, ':', 1))
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right_expr = _js_ternary(left_val, *self._separate(right_expr, ':', 1))
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right_val = self.interpret_expression(right_expr, local_vars, allow_recursion)
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opfunc = op and next((v for k, v in self._all_operators() if k == op), None)
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@ -361,7 +328,7 @@ class JSInterpreter(object):
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return obj[int(idx)] if isinstance(obj, list) else obj[idx]
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except Exception as e:
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if allow_undefined:
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return self.undefined
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return JS_Undefined
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raise self.Exception('Cannot get index {idx}'.format(**locals()), expr=repr(obj), cause=e)
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def _dump(self, obj, namespace):
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@ -395,9 +362,8 @@ class JSInterpreter(object):
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if expr[0] in _QUOTES:
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inner, outer = self._separate(expr, expr[0], 1)
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if expr[0] == '/':
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flags, _ = self._regex_flags(outer)
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inner, outer = inner.replace('"', r'\"'), ''
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inner = re.compile(js_to_json(inner + expr[0]), flags=flags) # , strict=True))
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flags, outer = self._regex_flags(outer)
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inner = re.compile(inner[1:], flags=flags) # , strict=True))
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else:
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inner = json.loads(js_to_json(inner + expr[0])) # , strict=True))
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if not outer:
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@ -422,7 +388,7 @@ class JSInterpreter(object):
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if expr.startswith('{'):
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inner, outer = self._separate_at_paren(expr, '}')
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# try for object expression
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# try for object expression (Map)
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sub_expressions = [list(self._separate(sub_expr.strip(), ':', 1)) for sub_expr in self._separate(inner)]
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if all(len(sub_expr) == 2 for sub_expr in sub_expressions):
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return dict(
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@ -455,7 +421,8 @@ class JSInterpreter(object):
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(?P<try>try|finally)\s*|
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(?P<catch>catch\s*(?P<err>\(\s*{_NAME_RE}\s*\)))|
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(?P<switch>switch)\s*\(|
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(?P<for>for)\s*\(|'''.format(**globals()), expr)
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(?P<for>for)\s*\(|
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'''.format(**globals()), expr)
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md = m.groupdict() if m else {}
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if md.get('try'):
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if expr[m.end()] == '{':
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@ -500,7 +467,7 @@ class JSInterpreter(object):
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start, cndn, increment = self._separate(constructor, ';')
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self.interpret_expression(start, local_vars, allow_recursion)
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while True:
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if not _ternary(self.interpret_expression(cndn, local_vars, allow_recursion)):
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if not _js_ternary(self.interpret_expression(cndn, local_vars, allow_recursion)):
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break
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try:
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ret, should_abort = self.interpret_statement(body, local_vars, allow_recursion)
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@ -587,7 +554,7 @@ class JSInterpreter(object):
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local_vars[m.group('out')] = self._operator(
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m.group('op'), left_val, m.group('expr'), expr, local_vars, allow_recursion)
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return local_vars[m.group('out')], should_return
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elif left_val in (None, self.undefined):
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elif left_val in (None, JS_Undefined):
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raise self.Exception('Cannot index undefined variable ' + m.group('out'), expr=expr)
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idx = self.interpret_expression(m.group('index'), local_vars, allow_recursion)
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@ -607,7 +574,7 @@ class JSInterpreter(object):
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raise JS_Continue()
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elif expr == 'undefined':
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return self.undefined, should_return
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return JS_Undefined, should_return
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elif md.get('return'):
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return local_vars[m.group('name')], should_return
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@ -663,9 +630,9 @@ class JSInterpreter(object):
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'Math': float,
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}
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obj = local_vars.get(variable)
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if obj in (self.undefined, None):
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obj = types.get(variable, self.undefined)
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if obj is self.undefined:
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if obj in (JS_Undefined, None):
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obj = types.get(variable, JS_Undefined)
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if obj is JS_Undefined:
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try:
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if variable not in self._objects:
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self._objects[variable] = self.extract_object(variable)
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@ -674,8 +641,8 @@ class JSInterpreter(object):
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if not nullish:
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raise
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if nullish and obj is self.undefined:
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return self.undefined
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if nullish and obj is JS_Undefined:
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return JS_Undefined
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# Member access
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if arg_str is None:
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