extension/lib.js


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export function getURLParts(urlString) {
    const {hostname, pathname} = new URL(urlString);

    return {
        hostnameParts: hostname.split('.'),
        pathnameParts: pathname.slice(1).split('/').filter(Boolean)
    };
}

export function getRuleScoreOnPage(rule, urlString) {
    const {hostnameMatch, pathnameMatch} = rule;
    const {hostnameParts, pathnameParts} = getURLParts(urlString);

    // If we succeed at all, no matter how badly, the score should be non-zero!
    let score = 1;

    for (let i = 0; i < hostnameMatch.length; i++) {
        if (hostnameParts[hostnameParts.length - 1 - i] !== hostnameMatch[i]) {
            return 0;
        }

        score++;
    }

    for (let i = 0; i < pathnameMatch.length; i++) {
        if (pathnameParts[i] !== pathnameMatch[i]) {
            return 0;
        }

        score++;
    }

    return score;
}