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[jsinterp] Fix and improve expression parsing

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* improve BODMAS (fixes https://github.com/ytdl-org/youtube-dl/issues/32815)
* support more weird expressions with multiple unary ops
This commit is contained in:
dirkf 2024-06-20 02:36:54 +01:00
parent ad01fa6cca
commit fd8242e3ef
1 changed files with 11 additions and 1 deletions
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12
youtube_dl/jsinterp.py
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@ -798,18 +798,28 @@ class JSInterpreter(object):
right_expr = separated.pop() right_expr = separated.pop()
# handle operators that are both unary and binary, minimal BODMAS # handle operators that are both unary and binary, minimal BODMAS
if op in ('+', '-'): if op in ('+', '-'):
# simplify/adjust consecutive instances of these operators
undone = 0 undone = 0
while len(separated) > 1 and not separated[-1].strip(): while len(separated) > 1 and not separated[-1].strip():
undone += 1 undone += 1
separated.pop() separated.pop()
if op == '-' and undone % 2 != 0: if op == '-' and undone % 2 != 0:
right_expr = op + right_expr right_expr = op + right_expr
elif op == '+':
while len(separated) > 1 and separated[-1].strip() in self.OP_CHARS:
right_expr = separated.pop() + right_expr
# hanging op at end of left => unary + (strip) or - (push right)
left_val = separated[-1] left_val = separated[-1]
for dm_op in ('*', '%', '/', '**'): for dm_op in ('*', '%', '/', '**'):
bodmas = tuple(self._separate(left_val, dm_op, skip_delims=skip_delim)) bodmas = tuple(self._separate(left_val, dm_op, skip_delims=skip_delim))
if len(bodmas) > 1 and not bodmas[-1].strip(): if len(bodmas) > 1 and not bodmas[-1].strip():
expr = op.join(separated) + op + right_expr expr = op.join(separated) + op + right_expr
right_expr = None if len(separated) > 1:
separated.pop()
right_expr = op.join((left_val, right_expr))
else:
separated = [op.join((left_val, right_expr))]
right_expr = None
break break
if right_expr is None: if right_expr is None:
continue continue