perf: cache parsed requirements

src/poetry/core/packages/dependency.py

@@ -350,7 +350,7 @@ def create_from_pep_508(
         from poetry.core.packages.vcs_dependency import VCSDependency
         from poetry.core.utils.patterns import wheel_file_re
         from poetry.core.vcs.git import ParsedUrl
-        from poetry.core.version.requirements import Requirement
+        from poetry.core.version.requirements import parse_requirement
 
         # Removing comments
         parts = name.split(" #", 1)
@@ -360,7 +360,7 @@ def create_from_pep_508(
             if " ;" in rest:
                 name += " ;" + rest.split(" ;", 1)[1]
 
-        req = Requirement(name)
+        req = parse_requirement(name)
 
         name = req.name
         link = None
@@ -495,7 +495,7 @@ def _make_file_or_dir_dep(
     path: Path,
     base: Path | None = None,
     subdirectory: str | None = None,
-    extras: list[str] | None = None,
+    extras: Iterable[str] | None = None,
 ) -> FileDependency | DirectoryDependency | None:
     """
     Helper function to create a file or directoru dependency with the given arguments.

src/poetry/core/version/requirements.py

@@ -1,14 +1,21 @@
 from __future__ import annotations
 
+import functools
 import urllib.parse as urlparse
 
+from typing import TYPE_CHECKING
+
 from poetry.core.constraints.version import parse_constraint
 from poetry.core.constraints.version.exceptions import ParseConstraintError
 from poetry.core.version.grammars import GRAMMAR_PEP_508_CONSTRAINTS
 from poetry.core.version.markers import _compact_markers
 from poetry.core.version.parser import Parser
 
 
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+
+
 class InvalidRequirementError(ValueError):
     """
     An invalid requirement was found, users should refer to PEP 508.
@@ -61,7 +68,9 @@ def __init__(self, requirement_string: str) -> None:
         else:
             self.url = None
 
-        self.extras = [e.value for e in parsed.scan_values(lambda t: t.type == "EXTRA")]
+        self.extras: Sequence[str] = [
+            e.value for e in parsed.scan_values(lambda t: t.type == "EXTRA")
+        ]
         constraint = next(parsed.find_data("version_specification"), None)
         constraint = ",".join(constraint.children) if constraint else "*"
 
@@ -102,3 +111,8 @@ def __str__(self) -> str:
 
     def __repr__(self) -> str:
         return f"<Requirement({str(self)!r})>"
+
+
+@functools.cache
+def parse_requirement(requirement_string: str) -> Requirement:
+    return Requirement(requirement_string)