performance: cache parsed constraints and versions

Author: radoering

src/poetry/core/constraints/generic/parser.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import functools
 import re
 
 from typing import TYPE_CHECKING
@@ -17,6 +18,7 @@
 BASIC_CONSTRAINT = re.compile(r"^(!?==?)?\s*([^\s]+?)\s*$")
 
 
+@functools.lru_cache(maxsize=None)
 def parse_constraint(constraints: str) -> BaseConstraint:
     if constraints == "*":
         return AnyConstraint()

src/poetry/core/constraints/version/parser.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import functools
 import re
 
 from typing import TYPE_CHECKING
@@ -12,6 +13,7 @@
     from poetry.core.constraints.version.version_constraint import VersionConstraint
 
 
+@functools.lru_cache(maxsize=None)
 def parse_constraint(constraints: str) -> VersionConstraint:
     if constraints == "*":
         from poetry.core.constraints.version.version_range import VersionRange

src/poetry/core/version/pep440/parser.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import functools
 import re
 
 from typing import TYPE_CHECKING
@@ -63,6 +64,7 @@ def _get_local(cls, match: Match[str] | None) -> LocalSegmentType | None:
         )
 
     @classmethod
+    @functools.lru_cache(maxsize=None)
     def parse(cls, value: str, version_class: type[T]) -> T:
         match = cls._regex.search(value) if value else None
         if not match:
@@ -80,4 +82,4 @@ def parse(cls, value: str, version_class: type[T]) -> T:
 
 
 def parse_pep440(value: str, version_class: type[T]) -> T:
-    return PEP440Parser.parse(value, version_class)
+    return PEP440Parser.parse(value, version_class)  # type: ignore[arg-type]