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/** |
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search.js searchs an XML index to HTML files. |
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|
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A part of the jsfind project (http://projects.elucidsoft.net/jsfind) |
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Copyright (C) 2003 Shawn Garbett |
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|
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This program is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 2 |
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of the License, or (at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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|
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Contact Info: |
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Shawn Garbett <Shawn@eLucidSoft.net> |
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http://www.elucidsoft.net |
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4037 General Bate Drive |
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Nashville, TN 37204 |
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*/ |
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|
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// Constants |
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var conversion = new String |
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("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXY"); |
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|
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// State variables |
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var query_left = ""; |
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var search_err = ""; |
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var results = null; |
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|
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var watchdog_id = 0; |
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var watchdog_callback = null; |
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|
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// Object to hold search results |
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function Result(title, link, freq) |
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{ |
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this.title=title; |
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this.link=link; |
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this.frequency=Number(freq); |
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} |
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|
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// Function to merge (intersect) two result sets |
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function intersect_results(data) |
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{ |
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// If there are no stored results, then these are the results |
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if(!results) |
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{ |
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results = data; |
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return; |
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} |
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|
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var output=new Array(); |
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|
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// There are existing results, to do an intersect... |
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for(var i=0; i<results.length; i++) |
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{ |
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for(var j=0; j<data.length; j++) |
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{ |
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if(data[j].title == results[i].title) |
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{ |
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results[i].frequency += data[j].frequency; |
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output.push(results[i]); |
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break; |
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} |
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} |
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} |
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|
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results = output; |
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} |
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|
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/* |
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From David Flanagan's, _Javascript:_The Definitive_Guide_, pg. 294-5, |
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published by O'Reilly, 4th edition, 2002 |
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*/ |
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function debug(msg) |
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{ |
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// return; // Disable debugging |
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|
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if(!debug.box) |
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{ |
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debug.box = document.createElement("div"); |
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debug.box.setAttribute("style", |
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"background-color:white" + |
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"font-family: monospace; " + |
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"border: solid black 3px; "+ |
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"padding: 10px;"); |
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|
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document.body.appendChild(debug.box); |
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debug.box.innerHTML = "<h1 style='test-align:cent'>Debugging Output</h1>"; |
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} |
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|
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var p = document.createElement("p"); |
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p.appendChild(document.createTextNode(msg)); |
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debug.box.appendChild(p); |
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} |
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|
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// |
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|
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// Convert a number into a base 62 alphanumeric number string |
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function convert(num) |
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{ |
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var base = conversion.length; |
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var pow = 1; |
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var pos = 0; |
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var out = ""; |
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|
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if(num == 0) |
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{ |
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return "0"; |
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} |
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|
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while (num > 0) |
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{ |
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pos = num % base; |
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out = conversion.charAt(pos) + out; |
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num = Math.floor(num/base); |
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pow *= base; |
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} |
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|
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return out; |
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} |
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|
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function watchdog() |
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{ |
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debug ("TIMEOUT!"); |
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watchdog_callback(new Array()); |
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} |
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|
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// This function loads the XML document from the specified URL, and when |
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// it is fully loaded, passes that document and the url to the specified |
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// handler function. This function works with any XML document |
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function loadXML(url, handler, data, result_handler) |
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{ |
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debug("loadXML("+url+","+data+")"); |
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|
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// Timeout operation in 10 seconds |
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watchdog_callback = result_handler; |
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watchdog_id=setTimeout("watchdog()", 20000); |
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|
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debug("setTimeout = "+watchdog_id); |
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|
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try |
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{ |
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// Use the standard DOM Level 2 technique, if it is supported |
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if (document.implementation && document.implementation.createDocument) |
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{ |
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// Create a new Document object |
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var xmldoc = document.implementation.createDocument("", "", null); |
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|
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// Specify what should happen when it finishes loading |
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xmldoc.onload = function() { handler(xmldoc, url, data, result_handler); } |
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|
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//xmldoc.onerror = docError; |
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//xmldoc.addEventListener("load",docError,false); |
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|
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// And tell it what URL to load |
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xmldoc.load(url); |
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} |
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// Otherwise use Microsoft's proprietary API for Internet Explorer |
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// Something about not following standards once again |
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else if (window.ActiveXObject) |
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{ |
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//var xmldoc = new ActiveXObject("MSXML2.DOMDocument"); // Create doc. |
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var xmldoc = new ActiveXObject("Microsoft.XMLDOM"); // Create doc. |
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// Specify onload |
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xmldoc.onreadystatechange = function() |
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{ |
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if (xmldoc.readyState == 4) handler(xmldoc, url, data, result_handler); |
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} |
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xmldoc.load(url); // Start loading! |
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} |
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} |
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catch(ex) |
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{ |
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clearTimeout(watchdog_id); |
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debug("clearTimeout = "+watchdog_id); |
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debug ("CAUGHT EXCEPTION!"); |
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result_handler(new Array()); |
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return false; |
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} |
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|
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return true; |
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} |
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|
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function loadData(xmldoc, url, pos, result_handler) |
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{ |
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clearTimeout(watchdog_id); |
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debug("clearTimeout = "+watchdog_id); |
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|
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debug ("loadData("+url+","+pos+")"); |
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|
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var data = new Array(); |
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|
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// Get all entries |
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var entries = xmldoc.getElementsByTagName("e"); |
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|
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if(entries.length > pos) |
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{ |
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// Get the links associated with this query |
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var links = entries[pos].getElementsByTagName("l"); |
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|
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// Dynamically append results to output |
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for(var i=0; i<links.length; i++) |
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{ |
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data.push(new Result(links[i].getAttribute("t"), |
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links[i].firstChild.data, |
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links[i].getAttribute("f"))); |
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} |
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|
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intersect_results(data); |
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|
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if(query_left.length > 0) |
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{ |
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doSearch(query_left, result_handler); |
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} |
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else |
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{ |
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results.sort(sortResults); |
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result_handler(results); |
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} |
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} |
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else |
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{ |
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debug("INTERNAL ERROR, Inconsistent index"); |
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search_err="INTERNAL ERROR, Inconsistent index"; |
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} |
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} |
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|
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function sortResults(a, b) |
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{ |
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return a.frequency - b.frequency; |
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} |
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|
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function traverseTree(xmldoc, url, query, result_handler) |
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{ |
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clearTimeout(watchdog_id); |
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debug("clearTimeout = "+watchdog_id); |
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|
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debug("traverseTree("+xmldoc+","+url+","+query+")"); |
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|
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var keys = xmldoc.getElementsByTagName("k"); |
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var i; |
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|
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for(i = 0; i < keys.length; i++) |
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{ |
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var key = keys[i].firstChild.data; |
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debug("traverseTree: key="+key+" query="+query); |
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if(key != '' && key != null) |
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{ |
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// Case where current key is greater than query, descend |
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if(key > query) |
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{ |
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if(key != '' && key != null) |
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{ |
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if(!loadXML(url.replace(".xml","/"+convert(i)+".xml"), |
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traverseTree,query,result_handler)) |
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{ |
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debug("Unable to locate key "+query); |
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} |
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// make sure of garbage collection |
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xmldoc=null; |
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return; |
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} |
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} |
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// Found it! |
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else if(key==query) |
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{ |
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if(!loadXML(url.replace(/(\w+\.xml)/, "_$1"), |
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loadData, i, result_handler)) |
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{ |
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debug("ERROR: Unable to locate data "+query); |
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} |
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// make sure of garbage collection |
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xmldoc=null; |
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return; |
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} |
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} |
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} |
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// Look past the end... |
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if(!loadXML(url.replace(".xml","/"+convert(i)+".xml"), |
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traverseTree,query,result_handler)) |
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{ |
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debug("Unable to locate key "+query); |
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} |
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// make sure of garbage collection |
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xmldoc=null; |
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return; |
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} |
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|
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function doSearch(query, result_func) |
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{ |
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//alert("doSearch("+query+")"); |
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var pos=query.search(/[\s\+]/); |
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|
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if(pos < 0) |
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{ |
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query_left = ""; |
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} |
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else |
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{ |
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query_left = query.slice(pos+1); |
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query = query.slice(0,pos); |
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} |
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|
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if(!loadXML("0.xml", traverseTree, query.toLowerCase(), result_func)) |
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{ |
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debug("ERROR: Couldn't find main index 0.xml"); |
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search_err = "INTERNAL ERROR: Unable to load main index 0.xml"; |
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} |
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} |
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