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some more on parser

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This commit is contained in:
Ruediger Ludwig 2022-12-07 20:52:42 +01:00
parent b711075a30
commit 82c7745b47
1 changed files with 10 additions and 15 deletions
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25
advent/parser/parser.py
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@ -63,18 +63,11 @@ class P(Generic[T]):
@staticmethod
def pure(value: T) -> P[T]:
def inner(parserPos: ParserInput) -> ParserResult[T]:
yield (parserPos, value)
return P(inner)
return P(lambda pp: iter([(pp, value)]))
@staticmethod
def fail() -> P[Any]:
def inner(_: ParserInput) -> ParserResult[Any]:
if False:
yield
pass
return P(inner)
return P(lambda _: iter([]))
@staticmethod
def _fix(p1: Callable[[P[Any]], P[T]]) -> P[T]:
@ -97,12 +90,14 @@ class P(Generic[T]):
return P(inner)
def safe_fmap(self, map_func: Callable[[T], TR]) -> P[TR]:
def inner(value: T) -> P[TR]:
try:
return P.pure(map_func(value))
except Exception:
return P.fail()
return self.bind(inner)
def inner(parserPos: ParserInput) -> ParserResult[TR]:
for pp, v in self.func(parserPos):
try:
yield pp, map_func(v)
except Exception:
pass
return P(inner)
def replace(self, value: TR) -> P[TR]:
return self.fmap(lambda _: value)