From: dirkf Date: Thu, 20 Jun 2024 01:57:52 +0000 (+0100) Subject: [jsinterp] Various tweaks X-Git-Url: http://git.oshgnacknak.de/?a=commitdiff_plain;h=e0094e63c3bce919841b6e3634c877fcef8772a1;p=youtube-dl [jsinterp] Various tweaks * treat Infinity like NaN * cache operator list --- diff --git a/youtube_dl/jsinterp.py b/youtube_dl/jsinterp.py index 12b71ed6a..02adf6678 100644 --- a/youtube_dl/jsinterp.py +++ b/youtube_dl/jsinterp.py @@ -54,15 +54,16 @@ def wraps_op(op): # NB In principle NaN cannot be checked by membership. # Here all NaN values are actually this one, so _NaN is _NaN, -# although _NaN != _NaN. +# although _NaN != _NaN. Ditto Infinity. _NaN = float('nan') +_Infinity = float('inf') def _js_bit_op(op): def zeroise(x): - return 0 if x in (None, JS_Undefined, _NaN) else x + return 0 if x in (None, JS_Undefined, _NaN, _Infinity) else x @wraps_op(op) def wrapped(a, b): @@ -85,7 +86,7 @@ def _js_arith_op(op): def _js_div(a, b): if JS_Undefined in (a, b) or not (a or b): return _NaN - return operator.truediv(a or 0, b) if b else float('inf') + return operator.truediv(a or 0, b) if b else _Infinity def _js_mod(a, b): @@ -344,8 +345,7 @@ class JSInterpreter(object): def __op_chars(cls): op_chars = set(';,[') for op in cls._all_operators(): - for c in op[0]: - op_chars.add(c) + op_chars.update(op[0]) return op_chars def _named_object(self, namespace, obj): @@ -363,9 +363,8 @@ class JSInterpreter(object): # collections.Counter() is ~10% slower in both 2.7 and 3.9 counters = dict((k, 0) for k in _MATCHING_PARENS.values()) start, splits, pos, delim_len = 0, 0, 0, len(delim) - 1 - in_quote, escaping, skipping = None, False, 0 - after_op, in_regex_char_group = True, False - + in_quote, escaping, after_op, in_regex_char_group = None, False, True, False + skipping = 0 for idx, char in enumerate(expr): paren_delta = 0 if not in_quote: @@ -419,10 +418,12 @@ class JSInterpreter(object): return separated[0][1:].strip(), separated[1].strip() @staticmethod - def _all_operators(): - return itertools.chain( - # Ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence - _SC_OPERATORS, _LOG_OPERATORS, _COMP_OPERATORS, _OPERATORS) + def _all_operators(_cached=[]): + if not _cached: + _cached.extend(itertools.chain( + # Ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence + _SC_OPERATORS, _LOG_OPERATORS, _COMP_OPERATORS, _OPERATORS)) + return _cached def _operator(self, op, left_val, right_expr, expr, local_vars, allow_recursion): if op in ('||', '&&'): @@ -549,7 +550,6 @@ class JSInterpreter(object): expr = self._dump(inner, local_vars) + outer if expr.startswith('('): - m = re.match(r'\((?P[a-z])%(?P[a-z])\.length\+(?P=e)\.length\)%(?P=e)\.length', expr) if m: # short-cut eval of frequently used `(d%e.length+e.length)%e.length`, worth ~6% on `pytest -k test_nsig` @@ -731,7 +731,7 @@ class JSInterpreter(object): (?P{_OPERATOR_RE})? =(?!=)(?P.*)$ )|(?P - (?!if|return|true|false|null|undefined)(?P{_NAME_RE})$ + (?!if|return|true|false|null|undefined|NaN|Infinity)(?P{_NAME_RE})$ )|(?P (?P{_NAME_RE})\[(?P.+)\]$ )|(?P @@ -765,11 +765,12 @@ class JSInterpreter(object): raise JS_Break() elif expr == 'continue': raise JS_Continue() - elif expr == 'undefined': return JS_Undefined, should_return elif expr == 'NaN': return _NaN, should_return + elif expr == 'Infinity': + return _Infinity, should_return elif md.get('return'): return local_vars[m.group('name')], should_return