[Webkit-unassigned] [Bug 247326] Add helper function to match identifiers and return a corresponding enum mapped enum value for CSS property parser

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247326

--- Comment #1 from Sam Weinig <sam at webkit.org> ---
One idea is to just use SortedArrayMap + a helper. For example, the helper "consumeIdentUsingMapping" and and example use:

```
template<typename Map>
static std::optional<typename Map::ValueType> consumeIdentUsingMapping(CSSParserTokenRange& range, Map& map)
{
    if (auto value = map.tryGet(range.peek().id())) {
        range.consumeIncludingWhitespace();
        return std::make_optional(*value);
    }
    return std::nullopt;
}

static std::optional<HueInterpolationMethod> consumeHueInterpolationMethod(CSSParserTokenRange& range)
{
    static constexpr std::pair<CSSValueID, HueInterpolationMethod> hueInterpolationMethodMappings[] {
        { CSSValueShorter, HueInterpolationMethod::Shorter },
        { CSSValueLonger, HueInterpolationMethod::Longer },
        { CSSValueIncreasing, HueInterpolationMethod::Increasing },
        { CSSValueDecreasing, HueInterpolationMethod::Decreasing },
        { CSSValueSpecified, HueInterpolationMethod::Specified },
    };
    static constexpr SortedArrayMap hueInterpolationMethodMap { hueInterpolationMethodMappings };

    return consumeIdentUsingMapping(range, hueInterpolationMethodMap);
}
```

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