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484 lines
18 KiB
JavaScript
484 lines
18 KiB
JavaScript
"use strict";
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window.search = window.search || {};
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(function search(search) {
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// Search functionality
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//
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// You can use !hasFocus() to prevent keyhandling in your key
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// event handlers while the user is typing their search.
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if (!Mark || !elasticlunr) {
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return;
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}
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//IE 11 Compatibility from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith
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if (!String.prototype.startsWith) {
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String.prototype.startsWith = function(search, pos) {
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return this.substr(!pos || pos < 0 ? 0 : +pos, search.length) === search;
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};
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}
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var search_wrap = document.getElementById('search-wrapper'),
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searchbar = document.getElementById('searchbar'),
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searchbar_outer = document.getElementById('searchbar-outer'),
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searchresults = document.getElementById('searchresults'),
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searchresults_outer = document.getElementById('searchresults-outer'),
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searchresults_header = document.getElementById('searchresults-header'),
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searchicon = document.getElementById('search-toggle'),
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content = document.getElementById('content'),
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searchindex = null,
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doc_urls = [],
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results_options = {
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teaser_word_count: 30,
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limit_results: 30,
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},
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search_options = {
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bool: "AND",
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expand: true,
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fields: {
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title: {boost: 1},
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body: {boost: 1},
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breadcrumbs: {boost: 0}
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}
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},
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mark_exclude = [],
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marker = new Mark(content),
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current_searchterm = "",
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URL_SEARCH_PARAM = 'search',
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URL_MARK_PARAM = 'highlight',
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teaser_count = 0,
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SEARCH_HOTKEY_KEYCODE = 83,
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ESCAPE_KEYCODE = 27,
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DOWN_KEYCODE = 40,
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UP_KEYCODE = 38,
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SELECT_KEYCODE = 13;
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function hasFocus() {
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return searchbar === document.activeElement;
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}
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function removeChildren(elem) {
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while (elem.firstChild) {
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elem.removeChild(elem.firstChild);
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}
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}
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// Helper to parse a url into its building blocks.
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function parseURL(url) {
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var a = document.createElement('a');
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a.href = url;
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return {
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source: url,
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protocol: a.protocol.replace(':',''),
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host: a.hostname,
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port: a.port,
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params: (function(){
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var ret = {};
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var seg = a.search.replace(/^\?/,'').split('&');
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var len = seg.length, i = 0, s;
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for (;i<len;i++) {
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if (!seg[i]) { continue; }
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s = seg[i].split('=');
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ret[s[0]] = s[1];
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}
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return ret;
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})(),
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file: (a.pathname.match(/\/([^/?#]+)$/i) || [,''])[1],
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hash: a.hash.replace('#',''),
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path: a.pathname.replace(/^([^/])/,'/$1')
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};
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}
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// Helper to recreate a url string from its building blocks.
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function renderURL(urlobject) {
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var url = urlobject.protocol + "://" + urlobject.host;
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if (urlobject.port != "") {
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url += ":" + urlobject.port;
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}
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url += urlobject.path;
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var joiner = "?";
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for(var prop in urlobject.params) {
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if(urlobject.params.hasOwnProperty(prop)) {
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url += joiner + prop + "=" + urlobject.params[prop];
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joiner = "&";
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}
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}
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if (urlobject.hash != "") {
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url += "#" + urlobject.hash;
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}
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return url;
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}
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// Helper to escape html special chars for displaying the teasers
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var escapeHTML = (function() {
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var MAP = {
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'&': '&',
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'<': '<',
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'>': '>',
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'"': '"',
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"'": '''
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};
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var repl = function(c) { return MAP[c]; };
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return function(s) {
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return s.replace(/[&<>'"]/g, repl);
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};
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})();
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function formatSearchMetric(count, searchterm) {
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if (count == 1) {
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return count + " search result for '" + searchterm + "':";
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} else if (count == 0) {
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return "No search results for '" + searchterm + "'.";
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} else {
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return count + " search results for '" + searchterm + "':";
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}
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}
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function formatSearchResult(result, searchterms) {
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var teaser = makeTeaser(escapeHTML(result.doc.body), searchterms);
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teaser_count++;
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// The ?URL_MARK_PARAM= parameter belongs inbetween the page and the #heading-anchor
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var url = doc_urls[result.ref].split("#");
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if (url.length == 1) { // no anchor found
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url.push("");
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}
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// encodeURIComponent escapes all chars that could allow an XSS except
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// for '. Due to that we also manually replace ' with its url-encoded
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// representation (%27).
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var searchterms = encodeURIComponent(searchterms.join(" ")).replace(/\'/g, "%27");
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return '<a href="' + path_to_root + url[0] + '?' + URL_MARK_PARAM + '=' + searchterms + '#' + url[1]
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+ '" aria-details="teaser_' + teaser_count + '">' + result.doc.breadcrumbs + '</a>'
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+ '<span class="teaser" id="teaser_' + teaser_count + '" aria-label="Search Result Teaser">'
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+ teaser + '</span>';
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}
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function makeTeaser(body, searchterms) {
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// The strategy is as follows:
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// First, assign a value to each word in the document:
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// Words that correspond to search terms (stemmer aware): 40
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// Normal words: 2
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// First word in a sentence: 8
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// Then use a sliding window with a constant number of words and count the
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// sum of the values of the words within the window. Then use the window that got the
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// maximum sum. If there are multiple maximas, then get the last one.
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// Enclose the terms in <em>.
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var stemmed_searchterms = searchterms.map(function(w) {
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return elasticlunr.stemmer(w.toLowerCase());
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});
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var searchterm_weight = 40;
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var weighted = []; // contains elements of ["word", weight, index_in_document]
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// split in sentences, then words
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var sentences = body.toLowerCase().split('. ');
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var index = 0;
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var value = 0;
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var searchterm_found = false;
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for (var sentenceindex in sentences) {
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var words = sentences[sentenceindex].split(' ');
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value = 8;
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for (var wordindex in words) {
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var word = words[wordindex];
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if (word.length > 0) {
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for (var searchtermindex in stemmed_searchterms) {
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if (elasticlunr.stemmer(word).startsWith(stemmed_searchterms[searchtermindex])) {
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value = searchterm_weight;
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searchterm_found = true;
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}
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};
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weighted.push([word, value, index]);
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value = 2;
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}
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index += word.length;
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index += 1; // ' ' or '.' if last word in sentence
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};
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index += 1; // because we split at a two-char boundary '. '
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};
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if (weighted.length == 0) {
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return body;
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}
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var window_weight = [];
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var window_size = Math.min(weighted.length, results_options.teaser_word_count);
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var cur_sum = 0;
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for (var wordindex = 0; wordindex < window_size; wordindex++) {
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cur_sum += weighted[wordindex][1];
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};
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window_weight.push(cur_sum);
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for (var wordindex = 0; wordindex < weighted.length - window_size; wordindex++) {
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cur_sum -= weighted[wordindex][1];
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cur_sum += weighted[wordindex + window_size][1];
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window_weight.push(cur_sum);
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};
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if (searchterm_found) {
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var max_sum = 0;
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var max_sum_window_index = 0;
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// backwards
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for (var i = window_weight.length - 1; i >= 0; i--) {
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if (window_weight[i] > max_sum) {
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max_sum = window_weight[i];
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max_sum_window_index = i;
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}
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};
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} else {
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max_sum_window_index = 0;
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}
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// add <em/> around searchterms
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var teaser_split = [];
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var index = weighted[max_sum_window_index][2];
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for (var i = max_sum_window_index; i < max_sum_window_index+window_size; i++) {
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var word = weighted[i];
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if (index < word[2]) {
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// missing text from index to start of `word`
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teaser_split.push(body.substring(index, word[2]));
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index = word[2];
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}
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if (word[1] == searchterm_weight) {
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teaser_split.push("<em>")
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}
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index = word[2] + word[0].length;
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teaser_split.push(body.substring(word[2], index));
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if (word[1] == searchterm_weight) {
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teaser_split.push("</em>")
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}
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};
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return teaser_split.join('');
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}
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function init(config) {
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results_options = config.results_options;
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search_options = config.search_options;
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searchbar_outer = config.searchbar_outer;
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doc_urls = config.doc_urls;
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searchindex = elasticlunr.Index.load(config.index);
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// Set up events
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searchicon.addEventListener('click', function(e) { searchIconClickHandler(); }, false);
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searchbar.addEventListener('keyup', function(e) { searchbarKeyUpHandler(); }, false);
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document.addEventListener('keydown', function(e) { globalKeyHandler(e); }, false);
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// If the user uses the browser buttons, do the same as if a reload happened
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window.onpopstate = function(e) { doSearchOrMarkFromUrl(); };
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// Suppress "submit" events so the page doesn't reload when the user presses Enter
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document.addEventListener('submit', function(e) { e.preventDefault(); }, false);
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// If reloaded, do the search or mark again, depending on the current url parameters
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doSearchOrMarkFromUrl();
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}
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function unfocusSearchbar() {
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// hacky, but just focusing a div only works once
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var tmp = document.createElement('input');
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tmp.setAttribute('style', 'position: absolute; opacity: 0;');
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searchicon.appendChild(tmp);
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tmp.focus();
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tmp.remove();
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}
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// On reload or browser history backwards/forwards events, parse the url and do search or mark
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function doSearchOrMarkFromUrl() {
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// Check current URL for search request
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var url = parseURL(window.location.href);
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if (url.params.hasOwnProperty(URL_SEARCH_PARAM)
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&& url.params[URL_SEARCH_PARAM] != "") {
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showSearch(true);
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searchbar.value = decodeURIComponent(
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(url.params[URL_SEARCH_PARAM]+'').replace(/\+/g, '%20'));
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searchbarKeyUpHandler(); // -> doSearch()
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} else {
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showSearch(false);
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}
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if (url.params.hasOwnProperty(URL_MARK_PARAM)) {
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var words = decodeURIComponent(url.params[URL_MARK_PARAM]).split(' ');
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marker.mark(words, {
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exclude: mark_exclude
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});
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var markers = document.querySelectorAll("mark");
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function hide() {
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for (var i = 0; i < markers.length; i++) {
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markers[i].classList.add("fade-out");
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window.setTimeout(function(e) { marker.unmark(); }, 300);
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}
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}
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for (var i = 0; i < markers.length; i++) {
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markers[i].addEventListener('click', hide);
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}
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}
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}
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// Eventhandler for keyevents on `document`
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function globalKeyHandler(e) {
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if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey || e.target.type === 'textarea' || e.target.type === 'text') { return; }
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if (e.keyCode === ESCAPE_KEYCODE) {
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e.preventDefault();
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searchbar.classList.remove("active");
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setSearchUrlParameters("",
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(searchbar.value.trim() !== "") ? "push" : "replace");
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if (hasFocus()) {
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unfocusSearchbar();
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}
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showSearch(false);
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marker.unmark();
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} else if (!hasFocus() && e.keyCode === SEARCH_HOTKEY_KEYCODE) {
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e.preventDefault();
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showSearch(true);
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window.scrollTo(0, 0);
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searchbar.select();
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} else if (hasFocus() && e.keyCode === DOWN_KEYCODE) {
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e.preventDefault();
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unfocusSearchbar();
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searchresults.firstElementChild.classList.add("focus");
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} else if (!hasFocus() && (e.keyCode === DOWN_KEYCODE
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|| e.keyCode === UP_KEYCODE
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|| e.keyCode === SELECT_KEYCODE)) {
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// not `:focus` because browser does annoying scrolling
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var focused = searchresults.querySelector("li.focus");
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if (!focused) return;
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e.preventDefault();
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if (e.keyCode === DOWN_KEYCODE) {
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var next = focused.nextElementSibling;
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if (next) {
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focused.classList.remove("focus");
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next.classList.add("focus");
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}
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} else if (e.keyCode === UP_KEYCODE) {
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focused.classList.remove("focus");
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var prev = focused.previousElementSibling;
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if (prev) {
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prev.classList.add("focus");
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} else {
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searchbar.select();
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}
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} else { // SELECT_KEYCODE
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window.location.assign(focused.querySelector('a'));
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}
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}
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}
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function showSearch(yes) {
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if (yes) {
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search_wrap.classList.remove('hidden');
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searchicon.setAttribute('aria-expanded', 'true');
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} else {
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search_wrap.classList.add('hidden');
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searchicon.setAttribute('aria-expanded', 'false');
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var results = searchresults.children;
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for (var i = 0; i < results.length; i++) {
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results[i].classList.remove("focus");
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}
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}
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}
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function showResults(yes) {
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if (yes) {
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searchresults_outer.classList.remove('hidden');
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} else {
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searchresults_outer.classList.add('hidden');
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}
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}
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// Eventhandler for search icon
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function searchIconClickHandler() {
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if (search_wrap.classList.contains('hidden')) {
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showSearch(true);
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window.scrollTo(0, 0);
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searchbar.select();
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} else {
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showSearch(false);
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}
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}
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// Eventhandler for keyevents while the searchbar is focused
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function searchbarKeyUpHandler() {
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var searchterm = searchbar.value.trim();
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if (searchterm != "") {
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searchbar.classList.add("active");
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doSearch(searchterm);
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} else {
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searchbar.classList.remove("active");
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showResults(false);
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removeChildren(searchresults);
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}
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setSearchUrlParameters(searchterm, "push_if_new_search_else_replace");
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// Remove marks
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marker.unmark();
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}
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// Update current url with ?URL_SEARCH_PARAM= parameter, remove ?URL_MARK_PARAM and #heading-anchor .
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// `action` can be one of "push", "replace", "push_if_new_search_else_replace"
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// and replaces or pushes a new browser history item.
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// "push_if_new_search_else_replace" pushes if there is no `?URL_SEARCH_PARAM=abc` yet.
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function setSearchUrlParameters(searchterm, action) {
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var url = parseURL(window.location.href);
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var first_search = ! url.params.hasOwnProperty(URL_SEARCH_PARAM);
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if (searchterm != "" || action == "push_if_new_search_else_replace") {
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url.params[URL_SEARCH_PARAM] = searchterm;
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delete url.params[URL_MARK_PARAM];
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url.hash = "";
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} else {
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delete url.params[URL_MARK_PARAM];
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delete url.params[URL_SEARCH_PARAM];
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}
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// A new search will also add a new history item, so the user can go back
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// to the page prior to searching. A updated search term will only replace
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// the url.
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if (action == "push" || (action == "push_if_new_search_else_replace" && first_search) ) {
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history.pushState({}, document.title, renderURL(url));
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} else if (action == "replace" || (action == "push_if_new_search_else_replace" && !first_search) ) {
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history.replaceState({}, document.title, renderURL(url));
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}
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}
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function doSearch(searchterm) {
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// Don't search the same twice
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if (current_searchterm == searchterm) { return; }
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else { current_searchterm = searchterm; }
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if (searchindex == null) { return; }
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// Do the actual search
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var results = searchindex.search(searchterm, search_options);
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var resultcount = Math.min(results.length, results_options.limit_results);
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// Display search metrics
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searchresults_header.innerText = formatSearchMetric(resultcount, searchterm);
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// Clear and insert results
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var searchterms = searchterm.split(' ');
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removeChildren(searchresults);
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for(var i = 0; i < resultcount ; i++){
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var resultElem = document.createElement('li');
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resultElem.innerHTML = formatSearchResult(results[i], searchterms);
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searchresults.appendChild(resultElem);
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}
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// Display results
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showResults(true);
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}
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fetch(path_to_root + 'searchindex.json')
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.then(response => response.json())
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.then(json => init(json))
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.catch(error => { // Try to load searchindex.js if fetch failed
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var script = document.createElement('script');
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script.src = path_to_root + 'searchindex.js';
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script.onload = () => init(window.search);
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document.head.appendChild(script);
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});
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// Exported functions
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search.hasFocus = hasFocus;
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})(window.search);
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