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Code Issues Releases Wiki Activity

Support if statements

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Fix for yt-dlp/yt_dlp#6131
Closes #31509
This commit is contained in:
pukkandan 2023-02-01 09:39:49 +05:30 committed by dirkf
parent 195f22f679
commit 14ef89a8da
3 changed files with 54 additions and 3 deletions
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32
test/test_jsinterp.py
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@ -158,6 +158,38 @@ class TestJSInterpreter(unittest.TestCase):
self.assertEqual(jsi.call_function('z'), 5)
self.assertEqual(jsi.call_function('y'), 2)
def test_if(self):
jsi = JSInterpreter('''
function x() {
let a = 9;
if (0==0) {a++}
return a
}''')
self.assertEqual(jsi.call_function('x'), 10)
jsi = JSInterpreter('''
function x() {
if (0==0) {return 10}
}''')
self.assertEqual(jsi.call_function('x'), 10)
jsi = JSInterpreter('''
function x() {
if (0!=0) {return 1}
else {return 10}
}''')
self.assertEqual(jsi.call_function('x'), 10)
""" # Unsupported
jsi = JSInterpreter('''
function x() {
if (0!=0) {return 1}
else if (1==0) {return 2}
else {return 10}
}''')
self.assertEqual(jsi.call_function('x'), 10)
"""
def test_for_loop(self):
# function x() { a=0; for (i=0; i-10; i++) {a++} a }
jsi = JSInterpreter('''

4
test/test_youtube_signature.py
View File

@ -135,6 +135,10 @@ _NSIG_TESTS = [
'https://www.youtube.com/s/player/5a3b6271/player_ias.vflset/en_US/base.js',
'B2j7f_UPT4rfje85Lu_e', 'm5DmNymaGQ5RdQ',
),
(
'https://www.youtube.com/s/player/dac945fd/player_ias.vflset/en_US/base.js',
'o8BkRxXhuYsBCWi6RplPdP', '3Lx32v_hmzTm6A',
),
]

21
youtube_dl/jsinterp.py
View File

@ -214,7 +214,7 @@ class JSInterpreter(object):
def __init__(self, msg, *args, **kwargs):
expr = kwargs.pop('expr', None)
if expr is not None:
msg = '{0} in: {1!r:.100}'.format(msg.rstrip(), expr)
msg = '{0} in: {1!r}'.format(msg.rstrip(), expr[:100])
super(JSInterpreter.Exception, self).__init__(msg, *args, **kwargs)
@classmethod
@ -268,7 +268,7 @@ class JSInterpreter(object):
elif in_quote == '/' and char in '[]':
in_regex_char_group = char == '['
escaping = not escaping and in_quote and char == '\\'
after_op = not in_quote and (char in cls.OP_CHARS or char == '[' or (char.isspace() and after_op))
after_op = not in_quote and (char in cls.OP_CHARS or (char.isspace() and after_op))
if char != delim[pos] or any(counters.values()) or in_quote:
pos = skipping = 0
@ -301,7 +301,7 @@ class JSInterpreter(object):
separated = list(cls._separate(expr, delim, 1))
if len(separated) < 2:
raise cls.Exception('No terminating paren {delim} in {expr:.100}'.format(**locals()))
raise cls.Exception('No terminating paren {delim} in {expr}'.format(**locals()))
return separated[0][1:].strip(), separated[1].strip()
@staticmethod
@ -428,10 +428,25 @@ class JSInterpreter(object):
m = re.match(r'''(?x)
(?P<try>try)\s*\{|
(?P<if>if)\s*\(|
(?P<switch>switch)\s*\(|
(?P<for>for)\s*\(
''', expr)
md = m.groupdict() if m else {}
if md.get('if'):
cndn, expr = self._separate_at_paren(expr[m.end() - 1:])
if_expr, expr = self._separate_at_paren(expr.lstrip())
# TODO: "else if" is not handled
else_expr = None
m = re.match(r'else\s*{', expr)
if m:
else_expr, expr = self._separate_at_paren(expr[m.end() - 1:])
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
if md.get('try'):
try_expr, expr = self._separate_at_paren(expr[m.end() - 1:])
err = None