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[parsing] remove the FailedCut exception and the associated logic #376

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Merged
apalala merged 1 commit into from
Dec 27, 2025
Merged

[parsing] remove the FailedCut exception and the associated logic #376

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15 changes: 3 additions & 12 deletions tatsu/contexts.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,6 @@
from .ast import AST
from .collections import OrderedSet as oset
from .exceptions import (
FailedCut,
FailedExpectingEndOfText,
FailedKeywordSemantics,
FailedLeftRecursion,
Expand Down Expand Up @@ -240,9 +239,6 @@ def parse(self, text, /, config: ParserConfig | None = None, **settings):
try:
rule = self._find_rule(start)
return rule()
except FailedCut as e:
self._set_furthest_exception(e.nested)
raise self._furthest_exception from e
except FailedParse as e:
self._set_furthest_exception(e)
raise self._furthest_exception from e
Expand Down Expand Up @@ -778,11 +774,9 @@ def _option(self):
with self._try():
yield
raise OptionSucceeded()
except FailedCut:
raise
except FailedParse as e:
except FailedParse:
if self._is_cut_set():
raise FailedCut(e) from e
raise
# else: ignore, so next option is tried
finally:
self._cut_stack.pop()
Expand All @@ -791,10 +785,7 @@ def _option(self):
def _choice(self):
self.last_node = None
with suppress(OptionSucceeded):
try:
yield
except FailedCut as e:
raise e.nested from e
yield

@contextmanager
def _optional(self):
Expand Down
14 changes: 0 additions & 14 deletions tatsu/exceptions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -112,20 +112,6 @@ def message(self):
return f"could not resolve reference to rule '{self.name}'"


class FailedCut(FailedParse):
def __init__(self, nested):
super().__init__(nested.tokenizer, nested.stack, nested.item)
self.pos = nested.pos
self.nested = nested

@property
def message(self):
return self.nested.message

def __reduce__(self):
return type(self), (self.nested,)


class FailedChoice(FailedParse):
@property
def message(self):
Expand Down