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Add CSS color validation with selectable formats - #123
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Adds CSS color validation via
it.IsCSSColor,validate.CSSColor, andis.CSSColor. With no format arguments, all 12 Symfony 8.0 categories are accepted; callers can restrict input, for example withit.IsCSSColor(validate.CSSColorRGB, validate.CSSColorRGBA).Supports 3/4/6/8-digit hex, basic/extended names, system colors, transparent/currentColor, and legacy RGB/RGBA/HSL/HSLA functions. Patterns preserve Symfony's case, numeric-range, alpha, and whitespace rules. README explicitly documents unsupported modern CSS syntax and keywords. Unknown formats produce configuration errors, including in mixed selections (stricter than Symfony); nil/empty input is otherwise skipped.
Includes custom errors/messages, groups and conditional validation, generic This/Each support, English/Russian translations, examples, and an Unreleased changelog entry. No new dependencies.
Validation:
bash scripts/test-all.shpassed (formatting, vet, golangci-lint v2.13.2, unit and race tests, module tidy and verification). Tests cover each format, cross-format rejection, RGB/HSL boundaries, alpha syntax, ASCII case handling, whitespace, malformed input, format selection, caller slice isolation, messages, and translations.Closes #107.