rust-search-extension/extension/search/attribute.js

function AttributeSearch(index) {
    this.attributesIndex = index;
    this.attributes = Object.keys(index);
    this.attributes.sort();
}

AttributeSearch.prototype.search = function(keyword) {
    keyword = keyword.replace(/[-_\s#]/ig, "");
    let result = [];

    for (let rawAttribute of this.attributes) {
        let attribute = rawAttribute.replace(/[-_\s#]/ig, "");
        if (attribute.length < keyword.length) continue;

        let index = attribute.indexOf(keyword);
        if (index > -1) {
            result.push({
                attribute: rawAttribute,
                matchIndex: index,
            });
        }
    }
    // Sort the result, the lower matchIndex, the shorter length, the higher rank.
    return result.sort((a, b) => {
        if (a.matchIndex === b.matchIndex) {
            return a.attribute.length - b.attribute.length;
        }
        return a.matchIndex - b.matchIndex;
    })
        .map(item => {
            let [description, href] = this.attributesIndex[item.attribute];
            return {
                name: item.attribute,
                description: description,
                href: href,
            }
        });
};