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Searcher = function(data) {
this.data = data;
this.handlers = [];
}
Searcher.prototype = new function() {
// 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[i]) && !longIndex.match(regexps[i])) 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)
})
}
}