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from __future__ import annotations
from collections.abc import Generator
from collections.abc import Iterable
from typing import NamedTuple
from typing import Protocol
from yaml.nodes import MappingNode
from yaml.nodes import Node
from yaml.nodes import ScalarNode
from yaml.nodes import SequenceNode
class _Matcher(Protocol):
def match(self, n: Node) -> Generator[Node]: ...
class MappingKey(NamedTuple):
k: str
def match(self, n: Node) -> Generator[Node]:
if isinstance(n, MappingNode):
for k, _ in n.value:
if k.value == self.k:
yield k
class MappingValue(NamedTuple):
k: str
def match(self, n: Node) -> Generator[Node]:
if isinstance(n, MappingNode):
for k, v in n.value:
if k.value == self.k:
yield v
class SequenceItem(NamedTuple):
def match(self, n: Node) -> Generator[Node]:
if isinstance(n, SequenceNode):
yield from n.value
def _match(gen: Iterable[Node], m: _Matcher) -> Iterable[Node]:
return (n for src in gen for n in m.match(src))
def match(n: Node, matcher: tuple[_Matcher, ...]) -> Generator[ScalarNode]:
gen: Iterable[Node] = (n,)
for m in matcher:
gen = _match(gen, m)
return (n for n in gen if isinstance(n, ScalarNode))