fix(add): do not pass @latest to parser

We should not pass in front-end specific `@latest` descriptor to the
core requirement parser.

Relates-to: #10068

src/poetry/console/commands/init.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import re
+
 from collections.abc import Mapping
 from contextlib import suppress
 from pathlib import Path
@@ -470,7 +472,10 @@ def _parse_requirements(self, requirements: list[str]) -> list[dict[str, Any]]:
             env=self.env if isinstance(self, EnvCommand) else None,
             cwd=cwd,
         )
-        return [parser.parse(requirement) for requirement in requirements]
+        return [
+            parser.parse(re.sub(r"@\s*latest", "", requirement, flags=re.I))
+            for requirement in requirements
+        ]
 
     def _format_requirements(self, requirements: list[dict[str, str]]) -> Requirements:
         requires: Requirements = {}

tests/console/commands/test_add.py

@@ -15,6 +15,7 @@
 from poetry.console.commands.installer_command import InstallerCommand
 from poetry.puzzle.exceptions import SolverProblemError
 from poetry.repositories.legacy_repository import LegacyRepository
+from poetry.utils.dependency_specification import RequirementsParser
 from tests.helpers import TestLocker
 from tests.helpers import get_dependency
 from tests.helpers import get_package
@@ -1245,6 +1246,21 @@ def test_add_should_fail_circular_dependency(
     assert expected in tester.io.fetch_error()
 
 
+def test_add_latest_should_strip_out_invalid_pep508_path(
+    tester: CommandTester, repo: TestRepository, mocker: MockerFixture
+) -> None:
+    spy = mocker.spy(RequirementsParser, "parse")
+    repo.add_package(get_package("foo", "1.1.1"))
+    repo.add_package(get_package("foo", "1.1.2"))
+    tester.execute("foo@latest")
+
+    assert tester.status_code == 0
+    assert "Using version ^1.1.2 for foo" in tester.io.fetch_output()
+
+    assert spy.call_count == 1
+    assert spy.call_args_list[0].args[1] == "foo"
+
+
 @pytest.mark.parametrize("project_dependencies", [True, False])
 def test_add_latest_should_not_create_duplicate_keys(
     project_factory: ProjectFactory,