Function adjacent

esquery.js:475–493

* Determines if the given node has an adjacent sibling that matches * the given selector matcher. * @param {external:AST} node * @param {SelectorMatcher} matcher * @param {external:AST[]} ancestry * @param {Side} side * @param {ESQueryOptions|undefined} options * @returns {boolean}

(node, matcher, ancestry, side, options)

 * @returns {boolean}
 */
function adjacent(node, matcher, ancestry, side, options) {
    const [parent] = ancestry;
    if (!parent) { return false; }
    const keys = getVisitorKeys(parent, options);
    for (let i = 0; i < keys.length; ++i) {
        const listProp = parent[keys[i]];
        if (Array.isArray(listProp)) {
            const idx = listProp.indexOf(node);
            if (idx < 0) { continue; }
            if (side === LEFT_SIDE && idx > 0 && isNode(listProp[idx - 1], options) && matcher(listProp[idx - 1], ancestry, options)) {
                return true;
            }
            if (side === RIGHT_SIDE && idx < listProp.length - 1 && isNode(listProp[idx + 1], options) &&  matcher(listProp[idx + 1], ancestry, options)) {
                return true;
            }
        }
    }
    return false;
}

/**
 * Determines if the given node is the `nth` child.