[Adnan9-63]

What this PR does / why we need it:

Adds support for Gentoo ebuild versions containing package slot syntax (:3, :6, :0/2.4, :3=) and wildcard suffixes (1.3*, 7.3*, 7.4*).

Previously, versions such as 1.3* and 3.24.48:3 raised an InvalidVersion exception in downstream tools (such as VulnerableCode's GentooImporter when parsing GLSA advisories):

InvalidVersion constraints version: 1.3* error:'1.3*' is not a valid <class 'univers.versions.GentooVersion'>

Changes:

1. Slot & Wildcard Parsing (src/univers/gentoo.py):
   • Added regex and parse_parts() helper to extract package slot qualifiers and wildcard suffixes.
   • Updated parse_version_and_revision() to strip slot and wildcard tokens so Portage PMS Section 3.3 vercmp evaluates without crashes.
   • Updated is_valid() to accept valid slotted and wildcard ebuild versions while rejecting invalid tokens (*, 1.3**, :3, 3.24.48:invalid!slot).
2. Properties on GentooVersion (src/univers/versions.py):
   • Added .slot property returning the slot string (or None).
   • Added .is_wildcard boolean property indicating if the version contains a trailing wildcard.
     (Note: Kept comparison operators strictly focused on </>/== to avoid overlap with open PR Implement __le__ and __ge__ for GentooVersion #211).
3. Comprehensive Tests (tests/test_gentoo.py):
   • Verified parsing and validity for reported issue versions (1.3*, 3.24.48:3, 6.9.3:6, 7.3*, 7.4*).
   • Added round-trip serialization tests with VersionConstraint and EbuildVersionRange (vers:ebuild/1.3*|>3.24.47:3).

Fixes #182

Checklist:

• Unit tests added/updated (pytest tests/test_gentoo.py tests/test_gentoo_pkgcore.py)
• Code style checked with black -l 100
• Commit is signed off (git commit -s)

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🟡 Changes recommended

A moderate active issue remains in src/univers/gentoo.py because the parser accepts a bare trailing colon as an empty slot, violating the requirement that slot qualifiers be non-empty.

1 open issue

• Reject empty slot qualifiers while preserving wildcard slots · New

_{Review effort: Lite}

[Copilot]

🟡 Changes recommended

The change still has a critical active issue because stripping the Gentoo wildcard causes valid matching patch versions such as 1.3.1 to be rejected.

1 open issue

• Wildcard constraints reject matching patch versions · New

1 resolved since last review

• Reject empty slot qualifiers while preserving wildcard slots

_{Review effort: Lite}