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+/**
+ * helper function to return a node containing the
+ * search summary for a given text. keywords is a list
+ * of stemmed words, hlwords is the list of normal, unstemmed
+ * words. the first one is used to find the occurance, the
+ * latter for highlighting it.
+ */
+jQuery.makeSearchSummary = function(text, keywords, hlwords) {
+ var textLower = text.toLowerCase();
+ var start = 0;
+ $.each(keywords, function() {
+ var i = textLower.indexOf(this.toLowerCase());
+ if (i > -1) {
+ start = i;
+ }
+ });
+ start = Math.max(start - 120, 0);
+ var excerpt = ((start > 0) ? '...' : '') +
+ $.trim(text.substr(start, 240)) +
+ ((start + 240 - text.length) ? '...' : '');
+ var rv = $('<div class="context"></div>').text(excerpt);
+ $.each(hlwords, function() {
+ rv = rv.highlightText(this, 'highlight');
+ });
+ return rv;
+}
+
+/**
+ * Porter Stemmer
+ */
+var PorterStemmer = function() {
+
+ var step2list = {
+ ational: 'ate',
+ tional: 'tion',
+ enci: 'ence',
+ anci: 'ance',
+ izer: 'ize',
+ bli: 'ble',
+ alli: 'al',
+ entli: 'ent',
+ eli: 'e',
+ ousli: 'ous',
+ ization: 'ize',
+ ation: 'ate',
+ ator: 'ate',
+ alism: 'al',
+ iveness: 'ive',
+ fulness: 'ful',
+ ousness: 'ous',
+ aliti: 'al',
+ iviti: 'ive',
+ biliti: 'ble',
+ logi: 'log'
+ };
+
+ var step3list = {
+ icate: 'ic',
+ ative: '',
+ alize: 'al',
+ iciti: 'ic',
+ ical: 'ic',
+ ful: '',
+ ness: ''
+ };
+
+ var c = "[^aeiou]"; // consonant
+ var v = "[aeiouy]"; // vowel
+ var C = c + "[^aeiouy]*"; // consonant sequence
+ var V = v + "[aeiou]*"; // vowel sequence
+
+ var mgr0 = "^(" + C + ")?" + V + C; // [C]VC... is m>0
+ var meq1 = "^(" + C + ")?" + V + C + "(" + V + ")?$"; // [C]VC[V] is m=1
+ var mgr1 = "^(" + C + ")?" + V + C + V + C; // [C]VCVC... is m>1
+ var s_v = "^(" + C + ")?" + v; // vowel in stem
+
+ this.stemWord = function (w) {
+ var stem;
+ var suffix;
+ var firstch;
+ var origword = w;
+
+ if (w.length < 3) {
+ return w;
+ }
+
+ var re;
+ var re2;
+ var re3;
+ var re4;
+
+ firstch = w.substr(0,1);
+ if (firstch == "y") {
+ w = firstch.toUpperCase() + w.substr(1);
+ }
+
+ // Step 1a
+ re = /^(.+?)(ss|i)es$/;
+ re2 = /^(.+?)([^s])s$/;
+
+ if (re.test(w)) {
+ w = w.replace(re,"$1$2");
+ }
+ else if (re2.test(w)) {
+ w = w.replace(re2,"$1$2");
+ }
+
+ // Step 1b
+ re = /^(.+?)eed$/;
+ re2 = /^(.+?)(ed|ing)$/;
+ if (re.test(w)) {
+ var fp = re.exec(w);
+ re = new RegExp(mgr0);
+ if (re.test(fp[1])) {
+ re = /.$/;
+ w = w.replace(re,"");
+ }
+ }
+ else if (re2.test(w)) {
+ var fp = re2.exec(w);
+ stem = fp[1];
+ re2 = new RegExp(s_v);
+ if (re2.test(stem)) {
+ w = stem;
+ re2 = /(at|bl|iz)$/;
+ re3 = new RegExp("([^aeiouylsz])\\1$");
+ re4 = new RegExp("^" + C + v + "[^aeiouwxy]$");
+ if (re2.test(w)) {
+ w = w + "e";
+ }
+ else if (re3.test(w)) {
+ re = /.$/; w = w.replace(re,"");
+ }
+ else if (re4.test(w)) {
+ w = w + "e";
+ }
+ }
+ }
+
+ // Step 1c
+ re = /^(.+?)y$/;
+ if (re.test(w)) {
+ var fp = re.exec(w);
+ stem = fp[1];
+ re = new RegExp(s_v);
+ if (re.test(stem)) { w = stem + "i"; }
+ }
+
+ // Step 2
+ re = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/;
+ if (re.test(w)) {
+ var fp = re.exec(w);
+ stem = fp[1];
+ suffix = fp[2];
+ re = new RegExp(mgr0);
+ if (re.test(stem)) {
+ w = stem + step2list[suffix];
+ }
+ }
+
+ // Step 3
+ re = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/;
+ if (re.test(w)) {
+ var fp = re.exec(w);
+ stem = fp[1];
+ suffix = fp[2];
+ re = new RegExp(mgr0);
+ if (re.test(stem)) {
+ w = stem + step3list[suffix];
+ }
+ }
+
+ // Step 4
+ re = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/;
+ re2 = /^(.+?)(s|t)(ion)$/;
+ if (re.test(w)) {
+ var fp = re.exec(w);
+ stem = fp[1];
+ re = new RegExp(mgr1);
+ if (re.test(stem)) {
+ w = stem;
+ }
+ }
+ else if (re2.test(w)) {
+ var fp = re2.exec(w);
+ stem = fp[1] + fp[2];
+ re2 = new RegExp(mgr1);
+ if (re2.test(stem)) {
+ w = stem;
+ }
+ }
+
+ // Step 5
+ re = /^(.+?)e$/;
+ if (re.test(w)) {
+ var fp = re.exec(w);
+ stem = fp[1];
+ re = new RegExp(mgr1);
+ re2 = new RegExp(meq1);
+ re3 = new RegExp("^" + C + v + "[^aeiouwxy]$");
+ if (re.test(stem) || (re2.test(stem) && !(re3.test(stem)))) {
+ w = stem;
+ }
+ }
+ re = /ll$/;
+ re2 = new RegExp(mgr1);
+ if (re.test(w) && re2.test(w)) {
+ re = /.$/;
+ w = w.replace(re,"");
+ }
+
+ // and turn initial Y back to y
+ if (firstch == "y") {
+ w = firstch.toLowerCase() + w.substr(1);
+ }
+ return w;
+ }
+}
+
+
+
+/**
+ * Search Module
+ */
+var Search = {
+
+ init : function() {
+ var params = $.getQueryParameters();
+ if (params.q) {
+ var query = params.q[0];
+ $('input[@name="q"]')[0].value = query;
+ this.performSearch(query);
+ }
+ },
+
+ /**
+ * perform a search for something
+ */
+ performSearch : function(query) {
+ // create the required interface elements
+ var out = $('#search-results');
+ var title = $('<h2>Searching</h2>').appendTo(out);
+ var dots = $('<span></span>').appendTo(title);
+ var status = $('<p style="display: none"></p>').appendTo(out);
+ var output = $('<ul class="search"/>').appendTo(out);
+
+ // spawn a background runner for updating the dots
+ // until the search has finished
+ var pulseStatus = 0;
+ function pulse() {
+ pulseStatus = (pulseStatus + 1) % 4;
+ var dotString = '';
+ for (var i = 0; i < pulseStatus; i++) {
+ dotString += '.';
+ }
+ dots.text(dotString);
+ if (pulseStatus > -1) {
+ window.setTimeout(pulse, 500);
+ }
+ };
+ pulse();
+
+ // stem the searchwords and add them to the
+ // correct list
+ var stemmer = new PorterStemmer();
+ var searchwords = [];
+ var excluded = [];
+ var hlwords = [];
+ var tmp = query.split(/\s+/);
+ for (var i = 0; i < tmp.length; i++) {
+ // stem the word
+ var word = stemmer.stemWord(tmp[i]).toLowerCase();
+ // select the correct list
+ if (word[0] == '-') {
+ var toAppend = excluded;
+ word = word.substr(1);
+ }
+ else {
+ var toAppend = searchwords;
+ hlwords.push(tmp[i].toLowerCase());
+ }
+ // only add if not already in the list
+ if (!$.contains(toAppend, word)) {
+ toAppend.push(word);
+ }
+ };
+ var highlightstring = '?highlight=' + $.urlencode(hlwords.join(" "));
+
+ console.debug('SEARCH: searching for:');
+ console.info('required: ', searchwords);
+ console.info('excluded: ', excluded);
+
+ // fetch searchindex and perform search
+ $.getJSON('searchindex.json', function(data) {
+
+ // prepare search
+ var filenames = data[0];
+ var titles = data[1]
+ var words = data[2];
+ var fileMap = {};
+ var files = null;
+
+ // perform the search on the required words
+ for (var i = 0; i < searchwords.length; i++) {
+ var word = searchwords[i];
+ // no match but word was a required one
+ if ((files = words[word]) == null) {
+ break;
+ }
+ // create the mapping
+ for (var j = 0; j < files.length; j++) {
+ var file = files[j];
+ if (file in fileMap) {
+ fileMap[file].push(word);
+ }
+ else {
+ fileMap[file] = [word];
+ }
+ }
+ }
+
+ // now check if the files are in the correct
+ // areas and if the don't contain excluded words
+ var results = [];
+ for (var file in fileMap) {
+ var valid = true;
+
+ // check if all requirements are matched
+ if (fileMap[file].length != searchwords.length) {
+ continue;
+ }
+ // ensure that none of the excluded words is in the
+ // search result.
+ for (var i = 0; i < excluded.length; i++) {
+ if ($.contains(words[excluded[i]] || [], file)) {
+ valid = false;
+ break;
+ }
+ }
+
+ // if we have still a valid result we can add it
+ // to the result list
+ if (valid) {
+ results.push([filenames[file], titles[file]]);
+ }
+ }
+
+ // delete unused variables in order to not waste
+ // memory until list is retrieved completely
+ delete filenames, titles, words, data;
+
+ // now sort the results by title
+ results.sort(function(a, b) {
+ var left = a[1].toLowerCase();
+ var right = b[1].toLowerCase();
+ return (left > right) ? -1 : ((left < right) ? 1 : 0);
+ });
+
+ // print the results
+ var resultCount = results.length;
+ function displayNextItem() {
+ // results left, load the summary and display it
+ if (results.length) {
+ var item = results.pop();
+ var listItem = $('<li style="display:none"></li>');
+ listItem.append($('<a/>').attr(
+ 'href',
+ item[0] + DOCUMENTATION_OPTIONS.FILE_SUFFIX +
+ highlightstring).html(item[1]));
+ $.get('_sources/' + item[0] + '.txt', function(data) {
+ listItem.append($.makeSearchSummary(data, searchwords, hlwords));
+ output.append(listItem);
+ listItem.slideDown(10, function() {
+ displayNextItem();
+ });
+ });
+ }
+ // search finished, update title and status message
+ else {
+ pulseStatus = -1;
+ title.text('Search Results');
+ if (!resultCount) {
+ status.text('Your search did not match any documents. ' +
+ 'Please make sure that all words are spelled ' +
+ 'correctly and that you\'ve selected enough ' +
+ 'categories.');
+ }
+ else {
+ status.text('Search finished, found ' + resultCount +
+ ' page' + (resultCount != 1 ? 's' : '') +
+ ' matching the search query.');
+ }
+ status.fadeIn(500);
+ }
+ }
+ displayNextItem();
+ });
+ }
+
+}
+
+$(document).ready(function() {
+ Search.init();
+ });
generated by cgit v1.1 at 2025-01-29 04:15:41 +0000