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[jsinterp] Cache undefined variable names (#13639)

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Authored by: bashonly
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bashonly 2025-07-05 16:59:33 -05:00 committed by bashonly
parent b6328ca050
commit b342d27f3f
1 changed files with 3 additions and 0 deletions
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yt_dlp/jsinterp.py
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@ -279,6 +279,7 @@ class JSInterpreter:
def __init__(self, code, objects=None): def __init__(self, code, objects=None):
self.code, self._functions = code, {} self.code, self._functions = code, {}
self._objects = {} if objects is None else objects self._objects = {} if objects is None else objects
self._undefined_varnames = set()
class Exception(ExtractorError): # noqa: A001 class Exception(ExtractorError): # noqa: A001
def __init__(self, msg, expr=None, *args, **kwargs): def __init__(self, msg, expr=None, *args, **kwargs):
@ -677,6 +678,8 @@ def dict_item(key, val):
local_vars.set_local(var, ret) local_vars.set_local(var, ret)
else: else:
ret = local_vars.get(var, JS_Undefined) ret = local_vars.get(var, JS_Undefined)
if ret is JS_Undefined:
self._undefined_varnames.add(var)
return ret, should_return return ret, should_return
with contextlib.suppress(ValueError): with contextlib.suppress(ValueError):