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<p>Searcher = function(data) {</p>
<pre>this.data = data; this.handlers = [];</pre>
<p>}</p>
<p>Searcher.prototype = new function() {</p>
<pre>// search is performed in chunks of 1000 for non-blocking user input var CHUNK_SIZE = 1000; // do not try to find more than 100 results var MAX_RESULTS = 100; var huid = 1; var suid = 1; var runs = 0;
this.find = function(query) {
var queries = splitQuery(query); var regexps = buildRegexps(queries); var highlighters = buildHilighters(queries); var state = { from: 0, pass: 0, limit: MAX_RESULTS, n: suid++}; var _this = this; this.currentSuid = state.n; if (!query) return; var run = function() { // stop current search thread if new search started if (state.n != _this.currentSuid) return; var results = performSearch(_this.data, regexps, queries, highlighters, state); var hasMore = (state.limit > 0 && state.pass < 4); triggerResults.call(_this, results, !hasMore); if (hasMore) { setTimeout(run, 2); } runs++; }; runs = 0; // start search thread run();
}
----- Events ------
this.ready = function(fn) {
fn.huid = huid; this.handlers.push(fn);
}
----- Utilities ------
function splitQuery(query) {
return jQuery.grep(query.split(/(\s+|::?|\(\)?)/), function(string) { return string.match(/\S/) });
}
function buildRegexps(queries) {
return jQuery.map(queries, function(query) { return new RegExp(query.replace(/(.)/g, '([$1])([^$1]*?)'), 'i') });
}
function buildHilighters(queries) {
return jQuery.map(queries, function(query) { return jQuery.map(query.split(''), function(l, i) { return '\u0001$' + (i*2+1) + '\u0002$' + (i*2+2); }).join(''); });
}
// function longMatchRegexp(index, longIndex, regexps) { // for (var i = regexps.length - 1; i >= 0; i–){ // if (!index.match(regexps) && !longIndex.match(regexps)) return false; // }; // return true; // }
----- Mathchers ------ This record matches if the index starts with queries[0] and the record matches all of the regexps /
function matchPassBeginning(index, longIndex, queries, regexps) {
if (index.indexOf(queries[0]) != 0) return false; for (var i=1, l = regexps.length; i < l; i++) { if (!index.match(regexps[i]) && !longIndex.match(regexps[i])) return false; }; return true;
}
/*
This record matches if the longIndex starts with queries[0] and the longIndex matches all of the regexps /
function matchPassLongIndex(index, longIndex, queries, regexps) {
if (longIndex.indexOf(queries[0]) != 0) return false; for (var i=1, l = regexps.length; i < l; i++) { if (!longIndex.match(regexps[i])) return false; }; return true;
}
/*
This record matches if the index contains queries[0] and the record matches all of the regexps /
function matchPassContains(index, longIndex, queries, regexps) {
if (index.indexOf(queries[0]) == -1) return false; for (var i=1, l = regexps.length; i < l; i++) { if (!index.match(regexps[i]) && !longIndex.match(regexps[i])) return false; }; return true;
}
/*
This record matches if regexps[0] matches the index and the record matches all of the regexps /
function matchPassRegexp(index, longIndex, queries, regexps) {
if (!index.match(regexps[0])) return false; for (var i=1, l = regexps.length; i < l; i++) { if (!index.match(regexps[i]) && !longIndex.match(regexps[i])) return false; }; return true;
}
/* —– Highlighters ——
function highlightRegexp(info, queries, regexps, highlighters) {
var result = createResult(info); for (var i=0, l = regexps.length; i < l; i++) { result.title = result.title.replace(regexps[i], highlighters[i]); result.namespace = result.namespace.replace(regexps[i], highlighters[i]); }; return result;
}
function hltSubstring(string, pos, length) {
return string.substring(0, pos) + '\u0001' + string.substring(pos, pos + length) + '\u0002' + string.substring(pos + length);
}
function highlightQuery(info, queries, regexps, highlighters) {
var result = createResult(info); var pos = 0; var lcTitle = result.title.toLowerCase(); pos = lcTitle.indexOf(queries[0]); if (pos != -1) { result.title = hltSubstring(result.title, pos, queries[0].length); } result.namespace = result.namespace.replace(regexps[0], highlighters[0]); for (var i=1, l = regexps.length; i < l; i++) { result.title = result.title.replace(regexps[i], highlighters[i]); result.namespace = result.namespace.replace(regexps[i], highlighters[i]); }; return result;
}
function createResult(info) {
var result = {}; result.title = info[0]; result.namespace = info[1]; result.path = info[2]; result.params = info[3]; result.snippet = info[4]; return result;
}
/* —– Searching —— */ function performSearch(data, regexps, queries, highlighters, state) {
var searchIndex = data.searchIndex; var longSearchIndex = data.longSearchIndex; var info = data.info; var result = []; var i = state.from; var l = searchIndex.length; var togo = CHUNK_SIZE; var matchFunc, hltFunc; while (state.pass < 4 && state.limit > 0 && togo > 0) { if (state.pass == 0) { matchFunc = matchPassBeginning; hltFunc = highlightQuery; } else if (state.pass == 1) { matchFunc = matchPassLongIndex; hltFunc = highlightQuery; } else if (state.pass == 2) { matchFunc = matchPassContains; hltFunc = highlightQuery; } else if (state.pass == 3) { matchFunc = matchPassRegexp; hltFunc = highlightRegexp; } for (; togo > 0 && i < l && state.limit > 0; i++, togo--) { if (info[i].n == state.n) continue; if (matchFunc(searchIndex[i], longSearchIndex[i], queries, regexps)) { info[i].n = state.n; result.push(hltFunc(info[i], queries, regexps, highlighters)); state.limit--; } }; if (searchIndex.length <= i) { state.pass++; i = state.from = 0; } else { state.from = i; } } return result;
}
function triggerResults(results, isLast) {
jQuery.each(this.handlers, function(i, fn) { fn.call(this, results, isLast) })
}</pre>
<p>}</p> </main>
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