Function compareDeclarations

lib/restructure/utils.js:27–73

(declarations1, declarations2)

}

export function compareDeclarations(declarations1, declarations2) {
    const result = {
        eq: [],
        ne1: [],
        ne2: [],
        ne2overrided: []
    };

    const fingerprints = Object.create(null);
    const declarations2hash = Object.create(null);

    for (let cursor = declarations2.head; cursor; cursor = cursor.next)  {
        declarations2hash[cursor.data.id] = true;
    }

    for (let cursor = declarations1.head; cursor; cursor = cursor.next)  {
        const data = cursor.data;

        if (data.fingerprint) {
            fingerprints[data.fingerprint] = data.important;
        }

        if (declarations2hash[data.id]) {
            declarations2hash[data.id] = false;
            result.eq.push(data);
        } else {
            result.ne1.push(data);
        }
    }

    for (let cursor = declarations2.head; cursor; cursor = cursor.next)  {
        const data = cursor.data;

        if (declarations2hash[data.id]) {
            // when declarations1 has an overriding declaration, this is not a difference
            // unless no !important is used on prev and !important is used on the following
            if (!hasOwnProperty.call(fingerprints, data.fingerprint) ||
                (!fingerprints[data.fingerprint] && data.important)) {
                result.ne2.push(data);
            }

            result.ne2overrided.push(data);
        }
    }

    return result;
}

export function addSelectors(dest, source) {
    source.forEach((sourceData) => {