[jsinterp] Bring on-par with youtube-dl
Code from: https://github.com/ytdl-org/youtube-dl/pull/31175, https://github.com/ytdl-org/youtube-dl/pull/31182 Authored by pukkandan, dirkf
This commit is contained in:
pukkandan
parent
8a3da4c68c
commit
be13a6e525
2 changed files with 295 additions and 61 deletions
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@ -7,8 +7,10 @@ import unittest
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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 yt_dlp.jsinterp import JSInterpreter
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from yt_dlp.jsinterp import JS_Undefined, JSInterpreter
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class TestJSInterpreter(unittest.TestCase):
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@ -66,6 +68,9 @@ class TestJSInterpreter(unittest.TestCase):
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jsi = JSInterpreter('function f(){return 0 && 1 || 2;}')
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self.assertEqual(jsi.call_function('f'), 2)
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jsi = JSInterpreter('function f(){return 0 ?? 42;}')
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self.assertEqual(jsi.call_function('f'), 0)
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def test_array_access(self):
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jsi = JSInterpreter('function f(){var x = [1,2,3]; x[0] = 4; x[0] = 5; x[2.0] = 7; return x;}')
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self.assertEqual(jsi.call_function('f'), [5, 2, 7])
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@ -229,6 +234,119 @@ class TestJSInterpreter(unittest.TestCase):
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''')
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self.assertEqual(jsi.call_function('x')([]), 1)
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def test_null(self):
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jsi = JSInterpreter('''
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function x() { return null; }
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''')
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self.assertEqual(jsi.call_function('x'), None)
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jsi = JSInterpreter('''
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function x() { return [null > 0, null < 0, null == 0, null === 0]; }
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''')
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self.assertEqual(jsi.call_function('x'), [False, False, False, False])
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jsi = JSInterpreter('''
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function x() { return [null >= 0, null <= 0]; }
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''')
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self.assertEqual(jsi.call_function('x'), [True, True])
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def test_undefined(self):
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jsi = JSInterpreter('''
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function x() { return undefined === undefined; }
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''')
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self.assertEqual(jsi.call_function('x'), True)
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jsi = JSInterpreter('''
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function x() { return undefined; }
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''')
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self.assertEqual(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.assertEqual(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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''')
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self.assertEqual(jsi.call_function('x'), [True, True, False, False])
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jsi = JSInterpreter('''
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function x() { return [undefined === 0, undefined == 0, undefined < 0, undefined > 0]; }
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''')
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self.assertEqual(jsi.call_function('x'), [False, False, False, False])
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jsi = JSInterpreter('''
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function x() { return [undefined >= 0, undefined <= 0]; }
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''')
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self.assertEqual(jsi.call_function('x'), [False, False])
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jsi = JSInterpreter('''
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function x() { return [undefined > null, undefined < null, undefined == null, undefined === null]; }
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''')
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self.assertEqual(jsi.call_function('x'), [False, False, True, False])
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jsi = JSInterpreter('''
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function x() { return [undefined === null, undefined == null, undefined < null, undefined > null]; }
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''')
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self.assertEqual(jsi.call_function('x'), [False, True, False, False])
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jsi = JSInterpreter('''
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function x() { let v; return [42+v, v+42, v**42, 42**v, 0**v]; }
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''')
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for y in jsi.call_function('x'):
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self.assertTrue(math.isnan(y))
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jsi = JSInterpreter('''
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function x() { let v; return v**0; }
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''')
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self.assertEqual(jsi.call_function('x'), 1)
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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, 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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def test_object(self):
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jsi = JSInterpreter('''
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function x() { return {}; }
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''')
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self.assertEqual(jsi.call_function('x'), {})
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jsi = JSInterpreter('''
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function x() { let a = {m1: 42, m2: 0 }; return [a["m1"], a.m2]; }
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''')
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self.assertEqual(jsi.call_function('x'), [42, 0])
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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.assertEqual(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.assertEqual(jsi.call_function('x'), JS_Undefined)
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def test_regex(self):
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jsi = JSInterpreter('''
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function x() { let a=/,,[/,913,/](,)}/; }
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''')
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self.assertEqual(jsi.call_function('x'), None)
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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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self.assertIsInstance(jsi.call_function('x'), 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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if __name__ == '__main__':
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unittest.main()
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@ -16,50 +16,69 @@ from .utils import (
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write_string,
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)
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_NAME_RE = r'[a-zA-Z_$][\w$]*'
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# Ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence
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_OPERATORS = { # None => Defined in JSInterpreter._operator
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'?': None,
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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, JS_Undefined) else x
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return op(zeroise(a), zeroise(b))
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'||': None,
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'&&': None,
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'&': lambda a, b: (a or 0) & (b or 0),
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'|': lambda a, b: (a or 0) | (b or 0),
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'^': lambda a, b: (a or 0) ^ (b or 0),
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'===': operator.is_,
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'!==': operator.is_not,
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'==': operator.eq,
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'!=': operator.ne,
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'<=': lambda a, b: (a or 0) <= (b or 0),
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'>=': lambda a, b: (a or 0) >= (b or 0),
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'<': lambda a, b: (a or 0) < (b or 0),
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'>': lambda a, b: (a or 0) > (b or 0),
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'>>': operator.rshift,
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'<<': operator.lshift,
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'+': lambda a, b: (a or 0) + (b or 0),
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'-': lambda a, b: (a or 0) - (b or 0),
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'*': lambda a, b: (a or 0) * (b or 0),
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'/': lambda a, b: (a or 0) / b if b else float('NaN'),
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'%': lambda a, b: (a or 0) % b if b else float('NaN'),
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'**': operator.pow,
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}
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_COMP_OPERATORS = {'===', '!==', '==', '!=', '<=', '>=', '<', '>'}
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_MATCHING_PARENS = dict(zip('({[', ')}]'))
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_QUOTES = '\'"/'
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return wrapped
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def _ternary(cndn, if_true=True, if_false=False):
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def _js_arith_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 float('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 and b):
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return float('nan')
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return (a or 0) / b if b else float('inf')
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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 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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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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def _js_eq_op(op):
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def wrapped(a, b):
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if {a, b} <= {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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def wrapped(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, ''):
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if cndn in (False, None, 0, '', JS_Undefined):
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return if_false
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with contextlib.suppress(TypeError):
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if math.isnan(cndn): # NB: NaN cannot be checked by membership
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@ -67,6 +86,50 @@ def _ternary(cndn, if_true=True, if_false=False):
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return if_true
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# Ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence
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_OPERATORS = { # None => Defined in JSInterpreter._operator
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'?': None,
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'??': None,
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'||': None,
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'&&': None,
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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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'===': operator.is_,
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'==': _js_eq_op(operator.eq),
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'!==': operator.is_not,
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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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'>>': _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_div,
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'%': _js_mod,
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'**': _js_exp,
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}
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_COMP_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:
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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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@ -119,6 +182,21 @@ class Debugger:
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class JSInterpreter:
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__named_object_counter = 0
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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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'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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_EXC_NAME = '__yt_dlp_exception__'
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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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@ -135,6 +213,17 @@ class JSInterpreter:
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namespace[name] = obj
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return 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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@staticmethod
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def _separate(expr, delim=',', max_split=None):
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OP_CHARS = '+-*/%&|^=<>!,;'
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@ -178,10 +267,13 @@ class JSInterpreter:
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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, 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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if not _OPERATORS.get(op):
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@ -192,12 +284,14 @@ class JSInterpreter:
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except Exception as e:
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raise self.Exception(f'Failed to evaluate {left_val!r} {op} {right_val!r}', expr, cause=e)
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def _index(self, obj, idx):
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def _index(self, obj, idx, allow_undefined=False):
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if idx == 'length':
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return len(obj)
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try:
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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 JS_Undefined
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raise self.Exception(f'Cannot get index {idx}', repr(obj), cause=e)
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def _dump(self, obj, namespace):
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@ -233,8 +327,8 @@ class JSInterpreter:
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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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inner = inner[1:].replace('"', R'\"')
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inner = re.compile(json.loads(js_to_json(f'"{inner}"', strict=True)))
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flags, outer = self._regex_flags(outer)
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inner = re.compile(inner[1:], flags=flags)
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else:
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inner = json.loads(js_to_json(f'{inner}{expr[0]}', strict=True))
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if not outer:
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@ -259,6 +353,17 @@ class JSInterpreter:
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if expr.startswith('{'):
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inner, outer = self._separate_at_paren(expr, '}')
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# Look for Map first
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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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def dict_item(key, val):
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val = self.interpret_expression(val, local_vars, allow_recursion)
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if re.match(_NAME_RE, key):
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return key, val
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return self.interpret_expression(key, local_vars, allow_recursion), val
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return dict(dict_item(k, v) for k, v in sub_expressions), should_return
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inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion)
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if not outer or should_abort:
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return inner, should_abort or should_return
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@ -295,17 +400,17 @@ class JSInterpreter:
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if should_abort:
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return ret, True
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except JS_Throw as e:
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local_vars['__ytdlp_exception__'] = e.error
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local_vars[self._EXC_NAME] = e.error
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except Exception as e:
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# XXX: This works for now, but makes debugging future issues very hard
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local_vars['__ytdlp_exception__'] = e
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local_vars[self._EXC_NAME] = e
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ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
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return ret, should_abort or should_return
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elif m and m.group('catch'):
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catch_expr, expr = self._separate_at_paren(expr[m.end():], '}')
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if '__ytdlp_exception__' in local_vars:
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catch_vars = local_vars.new_child({m.group('err'): local_vars.pop('__ytdlp_exception__')})
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if self._EXC_NAME in local_vars:
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catch_vars = local_vars.new_child({m.group('err'): local_vars.pop(self._EXC_NAME)})
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ret, should_abort = self.interpret_statement(catch_expr, catch_vars, allow_recursion)
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if should_abort:
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return ret, True
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@ -328,7 +433,7 @@ class JSInterpreter:
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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)):
|
||||
if not _js_ternary(self.interpret_expression(cndn, local_vars, allow_recursion)):
|
||||
break
|
||||
try:
|
||||
ret, should_abort = self.interpret_statement(body, local_vars, allow_recursion)
|
||||
|
|
@ -397,13 +502,13 @@ class JSInterpreter:
|
|||
(?P<assign>
|
||||
(?P<out>{_NAME_RE})(?:\[(?P<index>[^\]]+?)\])?\s*
|
||||
(?P<op>{"|".join(map(re.escape, set(_OPERATORS) - _COMP_OPERATORS))})?
|
||||
=(?P<expr>.*)$
|
||||
=(?!=)(?P<expr>.*)$
|
||||
)|(?P<return>
|
||||
(?!if|return|true|false|null|undefined)(?P<name>{_NAME_RE})$
|
||||
)|(?P<indexing>
|
||||
(?P<in>{_NAME_RE})\[(?P<idx>.+)\]$
|
||||
)|(?P<attribute>
|
||||
(?P<var>{_NAME_RE})(?:\.(?P<member>[^(]+)|\[(?P<member2>[^\]]+)\])\s*
|
||||
(?P<var>{_NAME_RE})(?:(?P<nullish>\?)?\.(?P<member>[^(]+)|\[(?P<member2>[^\]]+)\])\s*
|
||||
)|(?P<function>
|
||||
(?P<fname>{_NAME_RE})\((?P<args>.*)\)$
|
||||
)''', expr)
|
||||
|
|
@ -414,7 +519,7 @@ class JSInterpreter:
|
|||
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 is None:
|
||||
elif left_val in (None, JS_Undefined):
|
||||
raise self.Exception(f'Cannot index undefined variable {m.group("out")}', expr)
|
||||
|
||||
idx = self.interpret_expression(m.group('index'), local_vars, allow_recursion)
|
||||
|
|
@ -432,9 +537,11 @@ class JSInterpreter:
|
|||
raise JS_Break()
|
||||
elif expr == 'continue':
|
||||
raise JS_Continue()
|
||||
elif expr == 'undefined':
|
||||
return JS_Undefined, should_return
|
||||
|
||||
elif m and m.group('return'):
|
||||
return local_vars[m.group('name')], should_return
|
||||
return local_vars.get(m.group('name'), JS_Undefined), should_return
|
||||
|
||||
with contextlib.suppress(ValueError):
|
||||
return json.loads(js_to_json(expr, strict=True)), should_return
|
||||
|
|
@ -447,8 +554,11 @@ class JSInterpreter:
|
|||
for op in _OPERATORS:
|
||||
separated = list(self._separate(expr, op))
|
||||
right_expr = separated.pop()
|
||||
while op in '<>*-' and len(separated) > 1 and not separated[-1].strip():
|
||||
while True:
|
||||
if op in '?<>*-' and len(separated) > 1 and not separated[-1].strip():
|
||||
separated.pop()
|
||||
elif not (separated and op == '?' and right_expr.startswith('.')):
|
||||
break
|
||||
right_expr = f'{op}{right_expr}'
|
||||
if op != '-':
|
||||
right_expr = f'{separated.pop()}{op}{right_expr}'
|
||||
|
|
@ -458,8 +568,7 @@ class JSInterpreter:
|
|||
return self._operator(op, left_val, right_expr, expr, local_vars, allow_recursion), should_return
|
||||
|
||||
if m and m.group('attribute'):
|
||||
variable = m.group('var')
|
||||
member = m.group('member')
|
||||
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():]
|
||||
|
|
@ -486,12 +595,19 @@ class JSInterpreter:
|
|||
obj = local_vars.get(variable, types.get(variable, NO_DEFAULT))
|
||||
if obj is NO_DEFAULT:
|
||||
if variable not in self._objects:
|
||||
try:
|
||||
self._objects[variable] = self.extract_object(variable)
|
||||
obj = self._objects[variable]
|
||||
except self.Exception:
|
||||
if not nullish:
|
||||
raise
|
||||
obj = self._objects.get(variable, JS_Undefined)
|
||||
|
||||
if nullish and obj is JS_Undefined:
|
||||
return JS_Undefined
|
||||
|
||||
# Member access
|
||||
if arg_str is None:
|
||||
return self._index(obj, member)
|
||||
return self._index(obj, member, nullish)
|
||||
|
||||
# Function call
|
||||
argvals = [
|
||||
|
|
|
|||
Loading…
Reference in a new issue