judocss/src/judo.find.js

The functional CSS toolkit designed for minimal effort and maximum efficiency.

(function() {

    let findKeyCache = {}

    function _findKey(regMap, className) {

        className = className.replace(/--(small|medium|large|small-only|medium-only)\*?$/, "")

        let parts = className.split("-")

        if (parts.length <= 1) {
            return className
        }

        let i = parts.length
        let key
        while (i--) {
            parts.pop()
            key = parts.join("-") + "-"
            if (regMap[key]) {
                return key
            }
        }
    }

    function findKey(regMap, className) {
        findKeyCache[className] = findKeyCache[className] || _findKey(regMap, className)
        return findKeyCache[className]
    }

    const lookup = (className, classMap) => {

        let key = findKey(classMap, className)
        let entries = classMap[key]

        if (entries) {
            let i = entries.length
            while (i--) {
                let entry = entries[i]
                if (entry.regex.test(className)) {
                    return entry
                }
            }
        }
    }

    module.exports = lookup;

})()