[3.14] gh-138281: Run ruff on Tools/peg_generator (GH-138282) (#138469)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>

Tools/peg_generator/pegen/grammar.py

@@ -1,15 +1,7 @@
 from __future__ import annotations
 
-from typing import (
-    AbstractSet,
-    Any,
-    Iterable,
-    Iterator,
-    List,
-    Optional,
-    Tuple,
-    Union,
-)
+from collections.abc import Iterable, Iterator, Set
+from typing import Any
 
 
 class GrammarError(Exception):
@@ -34,7 +26,7 @@ def generic_visit(self, node: Iterable[Any], *args: Any, **kwargs: Any) -> Any:
 
 
 class Grammar:
-    def __init__(self, rules: Iterable[Rule], metas: Iterable[Tuple[str, Optional[str]]]):
+    def __init__(self, rules: Iterable[Rule], metas: Iterable[tuple[str, str | None]]):
         # Check if there are repeated rules in "rules"
         all_rules = {}
         for rule in rules:
@@ -66,7 +58,7 @@ def __iter__(self) -> Iterator[Rule]:
 
 
 class Rule:
-    def __init__(self, name: str, type: Optional[str], rhs: Rhs, memo: Optional[object] = None):
+    def __init__(self, name: str, type: str | None, rhs: Rhs, memo: object | None = None):
         self.name = name
         self.type = type
         self.rhs = rhs
@@ -141,9 +133,9 @@ def __repr__(self) -> str:
 
 
 class Rhs:
-    def __init__(self, alts: List[Alt]):
+    def __init__(self, alts: list[Alt]):
         self.alts = alts
-        self.memo: Optional[Tuple[Optional[str], str]] = None
+        self.memo: tuple[str | None, str] | None = None
 
     def __str__(self) -> str:
         return " | ".join(str(alt) for alt in self.alts)
@@ -151,7 +143,7 @@ def __str__(self) -> str:
     def __repr__(self) -> str:
         return f"Rhs({self.alts!r})"
 
-    def __iter__(self) -> Iterator[List[Alt]]:
+    def __iter__(self) -> Iterator[list[Alt]]:
         yield self.alts
 
     @property
@@ -165,7 +157,7 @@ def can_be_inlined(self) -> bool:
 
 
 class Alt:
-    def __init__(self, items: List[NamedItem], *, icut: int = -1, action: Optional[str] = None):
+    def __init__(self, items: list[NamedItem], *, icut: int = -1, action: str | None = None):
         self.items = items
         self.icut = icut
         self.action = action
@@ -185,12 +177,12 @@ def __repr__(self) -> str:
             args.append(f"action={self.action!r}")
         return f"Alt({', '.join(args)})"
 
-    def __iter__(self) -> Iterator[List[NamedItem]]:
+    def __iter__(self) -> Iterator[list[NamedItem]]:
         yield self.items
 
 
 class NamedItem:
-    def __init__(self, name: Optional[str], item: Item, type: Optional[str] = None):
+    def __init__(self, name: str | None, item: Item, type: str | None = None):
         self.name = name
         self.item = item
         self.type = type
@@ -271,7 +263,7 @@ class Repeat:
 
     def __init__(self, node: Plain):
         self.node = node
-        self.memo: Optional[Tuple[Optional[str], str]] = None
+        self.memo: tuple[str | None, str] | None = None
 
     def __iter__(self) -> Iterator[Plain]:
         yield self.node
@@ -334,12 +326,12 @@ def __init__(self) -> None:
         pass
 
     def __repr__(self) -> str:
-        return f"Cut()"
+        return "Cut()"
 
     def __str__(self) -> str:
-        return f"~"
+        return "~"
 
-    def __iter__(self) -> Iterator[Tuple[str, str]]:
+    def __iter__(self) -> Iterator[tuple[str, str]]:
         yield from ()
 
     def __eq__(self, other: object) -> bool:
@@ -347,15 +339,15 @@ def __eq__(self, other: object) -> bool:
             return NotImplemented
         return True
 
-    def initial_names(self) -> AbstractSet[str]:
+    def initial_names(self) -> Set[str]:
         return set()
 
 
-Plain = Union[Leaf, Group]
-Item = Union[Plain, Opt, Repeat, Forced, Lookahead, Rhs, Cut]
-RuleName = Tuple[str, Optional[str]]
-MetaTuple = Tuple[str, Optional[str]]
-MetaList = List[MetaTuple]
-RuleList = List[Rule]
-NamedItemList = List[NamedItem]
-LookaheadOrCut = Union[Lookahead, Cut]
+Plain = Leaf | Group
+Item = Plain | Opt | Repeat | Forced | Lookahead | Rhs | Cut
+RuleName = tuple[str, str | None]
+MetaTuple = tuple[str, str | None]
+MetaList = list[MetaTuple]
+RuleList = list[Rule]
+NamedItemList = list[NamedItem]
+LookaheadOrCut = Lookahead | Cut