mirror of
https://github.com/italicsjenga/gba.git
synced 2024-12-24 03:11:29 +11:00
478 lines
18 KiB
JavaScript
478 lines
18 KiB
JavaScript
"use strict";
|
|
window.search = window.search || {};
|
|
(function search(search) {
|
|
// Search functionality
|
|
//
|
|
// You can use !hasFocus() to prevent keyhandling in your key
|
|
// event handlers while the user is typing their search.
|
|
|
|
if (!Mark || !elasticlunr) {
|
|
return;
|
|
}
|
|
|
|
//IE 11 Compatibility from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith
|
|
if (!String.prototype.startsWith) {
|
|
String.prototype.startsWith = function(search, pos) {
|
|
return this.substr(!pos || pos < 0 ? 0 : +pos, search.length) === search;
|
|
};
|
|
}
|
|
|
|
var search_wrap = document.getElementById('search-wrapper'),
|
|
searchbar = document.getElementById('searchbar'),
|
|
searchbar_outer = document.getElementById('searchbar-outer'),
|
|
searchresults = document.getElementById('searchresults'),
|
|
searchresults_outer = document.getElementById('searchresults-outer'),
|
|
searchresults_header = document.getElementById('searchresults-header'),
|
|
searchicon = document.getElementById('search-toggle'),
|
|
content = document.getElementById('content'),
|
|
|
|
searchindex = null,
|
|
doc_urls = [],
|
|
results_options = {
|
|
teaser_word_count: 30,
|
|
limit_results: 30,
|
|
},
|
|
search_options = {
|
|
bool: "AND",
|
|
expand: true,
|
|
fields: {
|
|
title: {boost: 1},
|
|
body: {boost: 1},
|
|
breadcrumbs: {boost: 0}
|
|
}
|
|
},
|
|
mark_exclude = [],
|
|
marker = new Mark(content),
|
|
current_searchterm = "",
|
|
URL_SEARCH_PARAM = 'search',
|
|
URL_MARK_PARAM = 'highlight',
|
|
teaser_count = 0,
|
|
|
|
SEARCH_HOTKEY_KEYCODE = 83,
|
|
ESCAPE_KEYCODE = 27,
|
|
DOWN_KEYCODE = 40,
|
|
UP_KEYCODE = 38,
|
|
SELECT_KEYCODE = 13;
|
|
|
|
function hasFocus() {
|
|
return searchbar === document.activeElement;
|
|
}
|
|
|
|
function removeChildren(elem) {
|
|
while (elem.firstChild) {
|
|
elem.removeChild(elem.firstChild);
|
|
}
|
|
}
|
|
|
|
// Helper to parse a url into its building blocks.
|
|
function parseURL(url) {
|
|
var a = document.createElement('a');
|
|
a.href = url;
|
|
return {
|
|
source: url,
|
|
protocol: a.protocol.replace(':',''),
|
|
host: a.hostname,
|
|
port: a.port,
|
|
params: (function(){
|
|
var ret = {};
|
|
var seg = a.search.replace(/^\?/,'').split('&');
|
|
var len = seg.length, i = 0, s;
|
|
for (;i<len;i++) {
|
|
if (!seg[i]) { continue; }
|
|
s = seg[i].split('=');
|
|
ret[s[0]] = s[1];
|
|
}
|
|
return ret;
|
|
})(),
|
|
file: (a.pathname.match(/\/([^/?#]+)$/i) || [,''])[1],
|
|
hash: a.hash.replace('#',''),
|
|
path: a.pathname.replace(/^([^/])/,'/$1')
|
|
};
|
|
}
|
|
|
|
// Helper to recreate a url string from its building blocks.
|
|
function renderURL(urlobject) {
|
|
var url = urlobject.protocol + "://" + urlobject.host;
|
|
if (urlobject.port != "") {
|
|
url += ":" + urlobject.port;
|
|
}
|
|
url += urlobject.path;
|
|
var joiner = "?";
|
|
for(var prop in urlobject.params) {
|
|
if(urlobject.params.hasOwnProperty(prop)) {
|
|
url += joiner + prop + "=" + urlobject.params[prop];
|
|
joiner = "&";
|
|
}
|
|
}
|
|
if (urlobject.hash != "") {
|
|
url += "#" + urlobject.hash;
|
|
}
|
|
return url;
|
|
}
|
|
|
|
// Helper to escape html special chars for displaying the teasers
|
|
var escapeHTML = (function() {
|
|
var MAP = {
|
|
'&': '&',
|
|
'<': '<',
|
|
'>': '>',
|
|
'"': '"',
|
|
"'": '''
|
|
};
|
|
var repl = function(c) { return MAP[c]; };
|
|
return function(s) {
|
|
return s.replace(/[&<>'"]/g, repl);
|
|
};
|
|
})();
|
|
|
|
function formatSearchMetric(count, searchterm) {
|
|
if (count == 1) {
|
|
return count + " search result for '" + searchterm + "':";
|
|
} else if (count == 0) {
|
|
return "No search results for '" + searchterm + "'.";
|
|
} else {
|
|
return count + " search results for '" + searchterm + "':";
|
|
}
|
|
}
|
|
|
|
function formatSearchResult(result, searchterms) {
|
|
var teaser = makeTeaser(escapeHTML(result.doc.body), searchterms);
|
|
teaser_count++;
|
|
|
|
// The ?URL_MARK_PARAM= parameter belongs inbetween the page and the #heading-anchor
|
|
var url = doc_urls[result.ref].split("#");
|
|
if (url.length == 1) { // no anchor found
|
|
url.push("");
|
|
}
|
|
|
|
return '<a href="' + path_to_root + url[0] + '?' + URL_MARK_PARAM + '=' + searchterms + '#' + url[1]
|
|
+ '" aria-details="teaser_' + teaser_count + '">' + result.doc.breadcrumbs + '</a>'
|
|
+ '<span class="teaser" id="teaser_' + teaser_count + '" aria-label="Search Result Teaser">'
|
|
+ teaser + '</span>';
|
|
}
|
|
|
|
function makeTeaser(body, searchterms) {
|
|
// The strategy is as follows:
|
|
// First, assign a value to each word in the document:
|
|
// Words that correspond to search terms (stemmer aware): 40
|
|
// Normal words: 2
|
|
// First word in a sentence: 8
|
|
// Then use a sliding window with a constant number of words and count the
|
|
// sum of the values of the words within the window. Then use the window that got the
|
|
// maximum sum. If there are multiple maximas, then get the last one.
|
|
// Enclose the terms in <em>.
|
|
var stemmed_searchterms = searchterms.map(function(w) {
|
|
return elasticlunr.stemmer(w.toLowerCase());
|
|
});
|
|
var searchterm_weight = 40;
|
|
var weighted = []; // contains elements of ["word", weight, index_in_document]
|
|
// split in sentences, then words
|
|
var sentences = body.toLowerCase().split('. ');
|
|
var index = 0;
|
|
var value = 0;
|
|
var searchterm_found = false;
|
|
for (var sentenceindex in sentences) {
|
|
var words = sentences[sentenceindex].split(' ');
|
|
value = 8;
|
|
for (var wordindex in words) {
|
|
var word = words[wordindex];
|
|
if (word.length > 0) {
|
|
for (var searchtermindex in stemmed_searchterms) {
|
|
if (elasticlunr.stemmer(word).startsWith(stemmed_searchterms[searchtermindex])) {
|
|
value = searchterm_weight;
|
|
searchterm_found = true;
|
|
}
|
|
};
|
|
weighted.push([word, value, index]);
|
|
value = 2;
|
|
}
|
|
index += word.length;
|
|
index += 1; // ' ' or '.' if last word in sentence
|
|
};
|
|
index += 1; // because we split at a two-char boundary '. '
|
|
};
|
|
|
|
if (weighted.length == 0) {
|
|
return body;
|
|
}
|
|
|
|
var window_weight = [];
|
|
var window_size = Math.min(weighted.length, results_options.teaser_word_count);
|
|
|
|
var cur_sum = 0;
|
|
for (var wordindex = 0; wordindex < window_size; wordindex++) {
|
|
cur_sum += weighted[wordindex][1];
|
|
};
|
|
window_weight.push(cur_sum);
|
|
for (var wordindex = 0; wordindex < weighted.length - window_size; wordindex++) {
|
|
cur_sum -= weighted[wordindex][1];
|
|
cur_sum += weighted[wordindex + window_size][1];
|
|
window_weight.push(cur_sum);
|
|
};
|
|
|
|
if (searchterm_found) {
|
|
var max_sum = 0;
|
|
var max_sum_window_index = 0;
|
|
// backwards
|
|
for (var i = window_weight.length - 1; i >= 0; i--) {
|
|
if (window_weight[i] > max_sum) {
|
|
max_sum = window_weight[i];
|
|
max_sum_window_index = i;
|
|
}
|
|
};
|
|
} else {
|
|
max_sum_window_index = 0;
|
|
}
|
|
|
|
// add <em/> around searchterms
|
|
var teaser_split = [];
|
|
var index = weighted[max_sum_window_index][2];
|
|
for (var i = max_sum_window_index; i < max_sum_window_index+window_size; i++) {
|
|
var word = weighted[i];
|
|
if (index < word[2]) {
|
|
// missing text from index to start of `word`
|
|
teaser_split.push(body.substring(index, word[2]));
|
|
index = word[2];
|
|
}
|
|
if (word[1] == searchterm_weight) {
|
|
teaser_split.push("<em>")
|
|
}
|
|
index = word[2] + word[0].length;
|
|
teaser_split.push(body.substring(word[2], index));
|
|
if (word[1] == searchterm_weight) {
|
|
teaser_split.push("</em>")
|
|
}
|
|
};
|
|
|
|
return teaser_split.join('');
|
|
}
|
|
|
|
function init(config) {
|
|
results_options = config.results_options;
|
|
search_options = config.search_options;
|
|
searchbar_outer = config.searchbar_outer;
|
|
doc_urls = config.doc_urls;
|
|
searchindex = elasticlunr.Index.load(config.index);
|
|
|
|
// Set up events
|
|
searchicon.addEventListener('click', function(e) { searchIconClickHandler(); }, false);
|
|
searchbar.addEventListener('keyup', function(e) { searchbarKeyUpHandler(); }, false);
|
|
document.addEventListener('keydown', function(e) { globalKeyHandler(e); }, false);
|
|
// If the user uses the browser buttons, do the same as if a reload happened
|
|
window.onpopstate = function(e) { doSearchOrMarkFromUrl(); };
|
|
// Suppress "submit" events so the page doesn't reload when the user presses Enter
|
|
document.addEventListener('submit', function(e) { e.preventDefault(); }, false);
|
|
|
|
// If reloaded, do the search or mark again, depending on the current url parameters
|
|
doSearchOrMarkFromUrl();
|
|
}
|
|
|
|
function unfocusSearchbar() {
|
|
// hacky, but just focusing a div only works once
|
|
var tmp = document.createElement('input');
|
|
tmp.setAttribute('style', 'position: absolute; opacity: 0;');
|
|
searchicon.appendChild(tmp);
|
|
tmp.focus();
|
|
tmp.remove();
|
|
}
|
|
|
|
// On reload or browser history backwards/forwards events, parse the url and do search or mark
|
|
function doSearchOrMarkFromUrl() {
|
|
// Check current URL for search request
|
|
var url = parseURL(window.location.href);
|
|
if (url.params.hasOwnProperty(URL_SEARCH_PARAM)
|
|
&& url.params[URL_SEARCH_PARAM] != "") {
|
|
showSearch(true);
|
|
searchbar.value = decodeURIComponent(
|
|
(url.params[URL_SEARCH_PARAM]+'').replace(/\+/g, '%20'));
|
|
searchbarKeyUpHandler(); // -> doSearch()
|
|
} else {
|
|
showSearch(false);
|
|
}
|
|
|
|
if (url.params.hasOwnProperty(URL_MARK_PARAM)) {
|
|
var words = url.params[URL_MARK_PARAM].split(' ');
|
|
marker.mark(words, {
|
|
exclude: mark_exclude
|
|
});
|
|
|
|
var markers = document.querySelectorAll("mark");
|
|
function hide() {
|
|
for (var i = 0; i < markers.length; i++) {
|
|
markers[i].classList.add("fade-out");
|
|
window.setTimeout(function(e) { marker.unmark(); }, 300);
|
|
}
|
|
}
|
|
for (var i = 0; i < markers.length; i++) {
|
|
markers[i].addEventListener('click', hide);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Eventhandler for keyevents on `document`
|
|
function globalKeyHandler(e) {
|
|
if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey || e.target.type === 'textarea') { return; }
|
|
|
|
if (e.keyCode === ESCAPE_KEYCODE) {
|
|
e.preventDefault();
|
|
searchbar.classList.remove("active");
|
|
setSearchUrlParameters("",
|
|
(searchbar.value.trim() !== "") ? "push" : "replace");
|
|
if (hasFocus()) {
|
|
unfocusSearchbar();
|
|
}
|
|
showSearch(false);
|
|
marker.unmark();
|
|
} else if (!hasFocus() && e.keyCode === SEARCH_HOTKEY_KEYCODE) {
|
|
e.preventDefault();
|
|
showSearch(true);
|
|
window.scrollTo(0, 0);
|
|
searchbar.select();
|
|
} else if (hasFocus() && e.keyCode === DOWN_KEYCODE) {
|
|
e.preventDefault();
|
|
unfocusSearchbar();
|
|
searchresults.firstElementChild.classList.add("focus");
|
|
} else if (!hasFocus() && (e.keyCode === DOWN_KEYCODE
|
|
|| e.keyCode === UP_KEYCODE
|
|
|| e.keyCode === SELECT_KEYCODE)) {
|
|
// not `:focus` because browser does annoying scrolling
|
|
var focused = searchresults.querySelector("li.focus");
|
|
if (!focused) return;
|
|
e.preventDefault();
|
|
if (e.keyCode === DOWN_KEYCODE) {
|
|
var next = focused.nextElementSibling;
|
|
if (next) {
|
|
focused.classList.remove("focus");
|
|
next.classList.add("focus");
|
|
}
|
|
} else if (e.keyCode === UP_KEYCODE) {
|
|
focused.classList.remove("focus");
|
|
var prev = focused.previousElementSibling;
|
|
if (prev) {
|
|
prev.classList.add("focus");
|
|
} else {
|
|
searchbar.select();
|
|
}
|
|
} else { // SELECT_KEYCODE
|
|
window.location.assign(focused.querySelector('a'));
|
|
}
|
|
}
|
|
}
|
|
|
|
function showSearch(yes) {
|
|
if (yes) {
|
|
search_wrap.classList.remove('hidden');
|
|
searchicon.setAttribute('aria-expanded', 'true');
|
|
} else {
|
|
search_wrap.classList.add('hidden');
|
|
searchicon.setAttribute('aria-expanded', 'false');
|
|
var results = searchresults.children;
|
|
for (var i = 0; i < results.length; i++) {
|
|
results[i].classList.remove("focus");
|
|
}
|
|
}
|
|
}
|
|
|
|
function showResults(yes) {
|
|
if (yes) {
|
|
searchresults_outer.classList.remove('hidden');
|
|
} else {
|
|
searchresults_outer.classList.add('hidden');
|
|
}
|
|
}
|
|
|
|
// Eventhandler for search icon
|
|
function searchIconClickHandler() {
|
|
if (search_wrap.classList.contains('hidden')) {
|
|
showSearch(true);
|
|
window.scrollTo(0, 0);
|
|
searchbar.select();
|
|
} else {
|
|
showSearch(false);
|
|
}
|
|
}
|
|
|
|
// Eventhandler for keyevents while the searchbar is focused
|
|
function searchbarKeyUpHandler() {
|
|
var searchterm = searchbar.value.trim();
|
|
if (searchterm != "") {
|
|
searchbar.classList.add("active");
|
|
doSearch(searchterm);
|
|
} else {
|
|
searchbar.classList.remove("active");
|
|
showResults(false);
|
|
removeChildren(searchresults);
|
|
}
|
|
|
|
setSearchUrlParameters(searchterm, "push_if_new_search_else_replace");
|
|
|
|
// Remove marks
|
|
marker.unmark();
|
|
}
|
|
|
|
// Update current url with ?URL_SEARCH_PARAM= parameter, remove ?URL_MARK_PARAM and #heading-anchor .
|
|
// `action` can be one of "push", "replace", "push_if_new_search_else_replace"
|
|
// and replaces or pushes a new browser history item.
|
|
// "push_if_new_search_else_replace" pushes if there is no `?URL_SEARCH_PARAM=abc` yet.
|
|
function setSearchUrlParameters(searchterm, action) {
|
|
var url = parseURL(window.location.href);
|
|
var first_search = ! url.params.hasOwnProperty(URL_SEARCH_PARAM);
|
|
if (searchterm != "" || action == "push_if_new_search_else_replace") {
|
|
url.params[URL_SEARCH_PARAM] = searchterm;
|
|
delete url.params[URL_MARK_PARAM];
|
|
url.hash = "";
|
|
} else {
|
|
delete url.params[URL_SEARCH_PARAM];
|
|
}
|
|
// A new search will also add a new history item, so the user can go back
|
|
// to the page prior to searching. A updated search term will only replace
|
|
// the url.
|
|
if (action == "push" || (action == "push_if_new_search_else_replace" && first_search) ) {
|
|
history.pushState({}, document.title, renderURL(url));
|
|
} else if (action == "replace" || (action == "push_if_new_search_else_replace" && !first_search) ) {
|
|
history.replaceState({}, document.title, renderURL(url));
|
|
}
|
|
}
|
|
|
|
function doSearch(searchterm) {
|
|
|
|
// Don't search the same twice
|
|
if (current_searchterm == searchterm) { return; }
|
|
else { current_searchterm = searchterm; }
|
|
|
|
if (searchindex == null) { return; }
|
|
|
|
// Do the actual search
|
|
var results = searchindex.search(searchterm, search_options);
|
|
var resultcount = Math.min(results.length, results_options.limit_results);
|
|
|
|
// Display search metrics
|
|
searchresults_header.innerText = formatSearchMetric(resultcount, searchterm);
|
|
|
|
// Clear and insert results
|
|
var searchterms = searchterm.split(' ');
|
|
removeChildren(searchresults);
|
|
for(var i = 0; i < resultcount ; i++){
|
|
var resultElem = document.createElement('li');
|
|
resultElem.innerHTML = formatSearchResult(results[i], searchterms);
|
|
searchresults.appendChild(resultElem);
|
|
}
|
|
|
|
// Display results
|
|
showResults(true);
|
|
}
|
|
|
|
fetch(path_to_root + 'searchindex.json')
|
|
.then(response => response.json())
|
|
.then(json => init(json))
|
|
.catch(error => { // Try to load searchindex.js if fetch failed
|
|
var script = document.createElement('script');
|
|
script.src = path_to_root + 'searchindex.js';
|
|
script.onload = () => init(window.search);
|
|
document.head.appendChild(script);
|
|
});
|
|
|
|
// Exported functions
|
|
search.hasFocus = hasFocus;
|
|
})(window.search);
|