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Code Issues 7 Projects Releases Wiki Activity

[jsinterp] Handle default in switch better

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pukkandan 2021-11-03 16:25:48 +05:30
parent c588b602d3
commit a1fc7ca074
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3 changed files with 33 additions and 10 deletions
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15
test/test_jsinterp.py
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@ -132,6 +132,21 @@ class TestJSInterpreter(unittest.TestCase):
self.assertEqual(jsi.call_function('x', 3), 6)
self.assertEqual(jsi.call_function('x', 5), 0)
def test_switch_default(self):
jsi = JSInterpreter('''
function x(f) { switch(f){
case 2: f+=2;
default: f-=1;
case 5:
case 6: f+=6;
case 0: break;
case 1: f+=1;
} return f }
''')
self.assertEqual(jsi.call_function('x', 1), 2)
self.assertEqual(jsi.call_function('x', 5), 11)
self.assertEqual(jsi.call_function('x', 9), 14)
def test_try(self):
jsi = JSInterpreter('''
function x() { try{return 10} catch(e){return 5} }

6
test/test_youtube_signature.py
View File

@ -69,7 +69,11 @@ _NSIG_TESTS = [
(
'https://www.youtube.com/s/player/9216d1f7/player_ias.vflset/en_US/base.js',
'SLp9F5bwjAdhE9F-', 'gWnb9IK2DJ8Q1w',
), # TODO: Add more tests
),
(
'https://www.youtube.com/s/player/f8cb7a3b/player_ias.vflset/en_US/base.js',
'oBo2h5euWy6osrUt', 'ivXHpm7qJjJN',
),
]

22
yt_dlp/jsinterp.py
View File

@ -228,21 +228,25 @@ class JSInterpreter(object):
switch_val, remaining = self._seperate_at_paren(expr[m.end() - 1:], ')')
switch_val = self.interpret_expression(switch_val, local_vars, allow_recursion)
body, expr = self._seperate_at_paren(remaining, '}')
body, default = body.split('default:') if 'default:' in body else (body, None)
items = body.split('case ')[1:]
if default:
items.append(f'default:{default}')
matched = False
for item in items:
case, stmt = [i.strip() for i in self._seperate(item, ':', 1)]
matched = matched or case == 'default' or switch_val == self.interpret_expression(case, local_vars, allow_recursion)
if matched:
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._seperate(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 - 1)
if should_abort:
return ret
except JS_Break:
break
if matched:
break
return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0]
# Comma seperated statements