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https://github.com/ytdl-org/youtube-dl
synced 2024-12-16 06:27:00 +00:00
[jsinterp] Fix and improve loose and strict equality operations
* reimplement loose equality according to MDN (eg, 1 == "1") * improve strict equality (eg, "abc" === "abc" but 'abc' is not 'abc') * add tests for above
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dirkf
parent
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527c137e4e
@ -1,4 +1,5 @@
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#!/usr/bin/env python
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# coding: utf-8
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from __future__ import unicode_literals
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@ -11,7 +12,7 @@ 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.compat import compat_str
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from youtube_dl.compat import compat_str as str
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from youtube_dl.jsinterp import JS_Undefined, JSInterpreter
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NaN = object()
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@ -19,7 +20,7 @@ NaN = object()
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class TestJSInterpreter(unittest.TestCase):
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def _test(self, jsi_or_code, expected, func='f', args=()):
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if isinstance(jsi_or_code, compat_str):
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if isinstance(jsi_or_code, str):
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jsi_or_code = JSInterpreter(jsi_or_code)
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got = jsi_or_code.call_function(func, *args)
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if expected is NaN:
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@ -89,7 +90,35 @@ class TestJSInterpreter(unittest.TestCase):
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self._test('function f(){return 19 & 21;}', 17)
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self._test('function f(){return 11 >> 2;}', 2)
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self._test('function f(){return []? 2+3: 4;}', 5)
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# equality
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self._test('function f(){return 1 == 1}', True)
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self._test('function f(){return 1 == 1.0}', True)
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self._test('function f(){return 1 == "1"}', True)
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self._test('function f(){return 1 == 2}', False)
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self._test('function f(){return 1 != "1"}', False)
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self._test('function f(){return 1 != 2}', True)
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self._test('function f(){var x = {a: 1}; var y = x; return x == y}', True)
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self._test('function f(){var x = {a: 1}; return x == {a: 1}}', False)
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self._test('function f(){return NaN == NaN}', False)
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self._test('function f(){return null == undefined}', True)
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self._test('function f(){return "spam, eggs" == "spam, eggs"}', True)
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# strict equality
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self._test('function f(){return 1 === 1}', True)
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self._test('function f(){return 1 === 1.0}', True)
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self._test('function f(){return 1 === "1"}', False)
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self._test('function f(){return 1 === 2}', False)
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self._test('function f(){var x = {a: 1}; var y = x; return x === y}', True)
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self._test('function f(){var x = {a: 1}; return x === {a: 1}}', False)
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self._test('function f(){return NaN === NaN}', False)
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self._test('function f(){return null === undefined}', False)
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self._test('function f(){return null === null}', True)
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self._test('function f(){return undefined === undefined}', True)
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self._test('function f(){return "uninterned" === "uninterned"}', True)
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self._test('function f(){return 1 === 1}', True)
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self._test('function f(){return 1 === "1"}', False)
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self._test('function f(){return 1 !== 1}', False)
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self._test('function f(){return 1 !== "1"}', True)
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# expressions
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self._test('function f(){return 0 && 1 || 2;}', 2)
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self._test('function f(){return 0 ?? 42;}', 0)
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self._test('function f(){return "life, the universe and everything" < 42;}', False)
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@ -296,7 +325,7 @@ class TestJSInterpreter(unittest.TestCase):
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def test_undefined(self):
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self._test('function f() { return undefined === undefined; }', True)
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self._test('function f() { return undefined; }', JS_Undefined)
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self._test('function f() {return undefined ?? 42; }', 42)
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self._test('function f() { return undefined ?? 42; }', 42)
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self._test('function f() { let v; return v; }', JS_Undefined)
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self._test('function f() { let v; return v**0; }', 1)
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self._test('function f() { let v; return [v>42, v<=42, v&&42, 42&&v]; }',
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@ -1,3 +1,4 @@
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# coding: utf-8
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from __future__ import unicode_literals
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import itertools
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@ -64,6 +65,10 @@ _NaN = float('nan')
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_Infinity = float('inf')
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class JS_Undefined(object):
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pass
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def _js_bit_op(op):
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def zeroise(x):
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@ -107,12 +112,69 @@ def _js_exp(a, b):
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return (a or 0) ** b
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def _js_eq_op(op):
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def _js_to_primitive(v):
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return (
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','.join(map(_js_toString, v)) if isinstance(v, list)
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else '[object Object]' if isinstance(v, dict)
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else compat_str(v) if not isinstance(v, (
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compat_numeric_types, compat_basestring, bool))
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else v
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)
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def _js_toString(v):
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return (
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'undefined' if v is JS_Undefined
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else 'Infinity' if v == _Infinity
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else 'NaN' if v is _NaN
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else 'null' if v is None
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else compat_str(v) if isinstance(v, compat_numeric_types)
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else _js_to_primitive(v))
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_nullish = frozenset((None, JS_Undefined))
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def _js_eq(a, b):
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# NaN != any
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if _NaN in (a, b):
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return False
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# Object is Object
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if isinstance(a, type(b)) and isinstance(b, (dict, list)):
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return operator.is_(a, b)
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# general case
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if a == b:
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return True
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# null == undefined
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a_b = set((a, b))
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if a_b & _nullish:
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return a_b <= _nullish
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a, b = _js_to_primitive(a), _js_to_primitive(b)
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if not isinstance(a, compat_basestring):
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a, b = b, a
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# Number to String: convert the string to a number
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# Conversion failure results in ... false
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if isinstance(a, compat_basestring):
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return float_or_none(a) == b
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return a == b
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def _js_neq(a, b):
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return not _js_eq(a, b)
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def _js_id_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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if _NaN in (a, b):
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return op(_NaN, None)
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if not isinstance(a, (compat_basestring, compat_numeric_types)):
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a, b = b, a
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# strings are === if ==
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# why 'a' is not 'a': https://stackoverflow.com/a/1504848
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if isinstance(a, (compat_basestring, compat_numeric_types)):
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return a == b if op(0, 0) else a != b
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return op(a, b)
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return wrapped
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@ -187,10 +249,10 @@ _OPERATORS = (
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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_id_op(operator.is_)),
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('!==', _js_id_op(operator.is_not)),
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('==', _js_eq),
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('!=', _js_neq),
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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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@ -222,10 +284,6 @@ _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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