1 |
dpavlin |
391 |
/** |
2 |
|
|
search.js searchs an XML index to HTML files. |
3 |
|
|
|
4 |
|
|
A part of the jsfind project (http://projects.elucidsoft.net/jsfind) |
5 |
|
|
Copyright (C) 2003 Shawn Garbett |
6 |
|
|
|
7 |
|
|
This program is free software; you can redistribute it and/or |
8 |
|
|
modify it under the terms of the GNU General Public License |
9 |
|
|
as published by the Free Software Foundation; either version 2 |
10 |
|
|
of the License, or (at your option) any later version. |
11 |
|
|
|
12 |
|
|
This program is distributed in the hope that it will be useful, |
13 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 |
|
|
GNU General Public License for more details. |
16 |
|
|
|
17 |
|
|
You should have received a copy of the GNU General Public License |
18 |
|
|
along with this program; if not, write to the Free Software |
19 |
|
|
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
20 |
|
|
|
21 |
|
|
Contact Info: |
22 |
|
|
Shawn Garbett <Shawn@eLucidSoft.net> |
23 |
|
|
http://www.elucidsoft.net |
24 |
|
|
4037 General Bate Drive |
25 |
|
|
Nashville, TN 37204 |
26 |
|
|
*/ |
27 |
|
|
|
28 |
|
|
// Constants |
29 |
|
|
var conversion = new String |
30 |
dpavlin |
534 |
("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXY"); |
31 |
dpavlin |
391 |
|
32 |
|
|
// State variables |
33 |
|
|
var query_left = ""; |
34 |
|
|
var search_err = ""; |
35 |
|
|
var results = null; |
36 |
|
|
var index_path = ""; |
37 |
|
|
|
38 |
|
|
var watchdog_id = 0; |
39 |
|
|
var watchdog_callback = null; |
40 |
|
|
|
41 |
|
|
// Object to hold search results |
42 |
dpavlin |
534 |
function Result(title, link, freq) { |
43 |
|
|
this.title=title; |
44 |
|
|
this.link=link; |
45 |
|
|
this.frequency=Number(freq); |
46 |
dpavlin |
391 |
} |
47 |
|
|
|
48 |
|
|
// Function to merge (intersect) two result sets |
49 |
dpavlin |
534 |
function intersect_results(data) { |
50 |
|
|
// If there are no stored results, then these are the results |
51 |
|
|
if (! results) { |
52 |
|
|
results = data; |
53 |
|
|
return; |
54 |
|
|
} |
55 |
dpavlin |
391 |
|
56 |
dpavlin |
534 |
var output=new Array(); |
57 |
dpavlin |
391 |
|
58 |
dpavlin |
534 |
// There are existing results, to do an intersect... |
59 |
|
|
for (var i=0; i<results.length; i++) { |
60 |
|
|
for (var j=0; j<data.length; j++) { |
61 |
|
|
if (data[j].title == results[i].title) { |
62 |
|
|
results[i].frequency += data[j].frequency; |
63 |
|
|
output.push(results[i]); |
64 |
|
|
break; |
65 |
|
|
} |
66 |
|
|
} |
67 |
|
|
} |
68 |
dpavlin |
391 |
|
69 |
dpavlin |
534 |
results = output; |
70 |
dpavlin |
391 |
} |
71 |
|
|
|
72 |
|
|
/* |
73 |
|
|
From David Flanagan's, _Javascript:_The Definitive_Guide_, pg. 294-5, |
74 |
dpavlin |
534 |
published by O'Reilly, 4th edition, 2002 |
75 |
dpavlin |
391 |
*/ |
76 |
dpavlin |
496 |
|
77 |
|
|
var debug_div = null; |
78 |
|
|
|
79 |
dpavlin |
534 |
function debug(msg) { |
80 |
dpavlin |
391 |
|
81 |
dpavlin |
534 |
// return; // Disable debugging |
82 |
dpavlin |
391 |
|
83 |
dpavlin |
534 |
if (! debug_div) debug_div = document.getElementById('debug'); |
84 |
|
|
|
85 |
|
|
// this will create debug div if it doesn't exist. |
86 |
|
|
if (! debug_div) { |
87 |
|
|
debug_div = document.createElement('div'); |
88 |
|
|
if (document.body) document.body.appendChild(debug_div); |
89 |
|
|
else debug_div = null; |
90 |
|
|
} |
91 |
|
|
if (debug_div) { |
92 |
|
|
debug_div.appendChild(document.createTextNode(msg)); |
93 |
|
|
debug_div.appendChild(document.createElement("br")); |
94 |
|
|
} |
95 |
dpavlin |
391 |
} |
96 |
|
|
|
97 |
|
|
// Convert a number into a base 62 alphanumeric number string |
98 |
dpavlin |
534 |
function convert(num) { |
99 |
|
|
var base = conversion.length; |
100 |
|
|
var pow = 1; |
101 |
|
|
var pos = 0; |
102 |
|
|
var out = ""; |
103 |
dpavlin |
391 |
|
104 |
dpavlin |
534 |
if (num == 0) return "0"; |
105 |
dpavlin |
391 |
|
106 |
dpavlin |
534 |
while (num > 0) { |
107 |
|
|
pos = num % base; |
108 |
|
|
out = conversion.charAt(pos) + out; |
109 |
|
|
num = Math.floor(num/base); |
110 |
|
|
pow *= base; |
111 |
|
|
} |
112 |
dpavlin |
391 |
|
113 |
dpavlin |
534 |
return out; |
114 |
dpavlin |
391 |
} |
115 |
|
|
|
116 |
dpavlin |
534 |
function watchdog() { |
117 |
|
|
debug ("TIMEOUT!"); |
118 |
|
|
watchdog_callback(new Array()); |
119 |
dpavlin |
391 |
} |
120 |
|
|
|
121 |
dpavlin |
469 |
var xmldoc; |
122 |
|
|
|
123 |
dpavlin |
391 |
// This function loads the XML document from the specified URL, and when |
124 |
|
|
// it is fully loaded, passes that document and the url to the specified |
125 |
|
|
// handler function. This function works with any XML document |
126 |
|
|
|
127 |
dpavlin |
534 |
function loadXML(url, handler, data, result_handler) { |
128 |
|
|
debug("loadXML("+url+","+data+")"); |
129 |
dpavlin |
391 |
|
130 |
dpavlin |
534 |
// Timeout operation in 10 seconds |
131 |
|
|
watchdog_callback = result_handler; |
132 |
|
|
watchdog_id=setTimeout("watchdog()", 20000); |
133 |
dpavlin |
391 |
|
134 |
dpavlin |
534 |
debug("setTimeout = "+watchdog_id); |
135 |
dpavlin |
391 |
|
136 |
dpavlin |
534 |
try { |
137 |
|
|
// Use the standard DOM Level 2 technique, if it is supported |
138 |
|
|
if (document.implementation && document.implementation.createDocument) { |
139 |
|
|
// Create a new Document object |
140 |
|
|
xmldoc = document.implementation.createDocument("", "", null); |
141 |
dpavlin |
391 |
|
142 |
dpavlin |
534 |
// Specify what should happen when it finishes loading |
143 |
|
|
xmldoc.onload = function() { handler(xmldoc, url, data, result_handler); } |
144 |
dpavlin |
391 |
|
145 |
dpavlin |
534 |
//xmldoc.onerror = docError; |
146 |
|
|
//xmldoc.addEventListener("load",docError,false); |
147 |
dpavlin |
496 |
|
148 |
dpavlin |
534 |
// And tell it what URL to load |
149 |
|
|
xmldoc.load(url); |
150 |
|
|
return true; |
151 |
|
|
} |
152 |
|
|
// Otherwise use Microsoft's proprietary API for Internet Explorer |
153 |
|
|
// Something about not following standards once again |
154 |
|
|
else if (window.ActiveXObject) { |
155 |
|
|
xmldoc = new ActiveXObject("Microsoft.XMLDOM"); // Create doc. |
156 |
|
|
if (! xmldoc) xmldoc = new ActiveXObject("MSXML2.DOMDocument"); // Create doc. |
157 |
|
|
// Specify onload |
158 |
|
|
xmldoc.onreadystatechange = function() { |
159 |
|
|
if (xmldoc.readyState == 4) handler(xmldoc, url, data, result_handler); |
160 |
|
|
} |
161 |
|
|
xmldoc.load(url); // Start loading! |
162 |
|
|
return true; |
163 |
|
|
} |
164 |
|
|
// else fallback on usage of iframes to load xml (Opera 7.53 without Java and maybe old Mac browsers) |
165 |
|
|
else { |
166 |
|
|
debug("using iframe xml loader - experimental and slow"); |
167 |
|
|
if (! window.xml_iframe) { |
168 |
|
|
debug("creating iframe"); |
169 |
|
|
window.xml_iframe = document.createElement('div'); |
170 |
|
|
window.xml_iframe.innerHTML = '<iframe src="'+url+'" name="xml_iframe" height="0" width="0" style="display: none;"></iframe>'; |
171 |
|
|
document.body.appendChild(window.xml_iframe); |
172 |
|
|
} else { |
173 |
|
|
debug("loading xml in existing iframe"); |
174 |
|
|
window.frames.xml_iframe.window.document.location.href = url; |
175 |
|
|
} |
176 |
dpavlin |
496 |
|
177 |
dpavlin |
534 |
// set timeout to re-check if iframe is loaded |
178 |
|
|
window.iframe_timeout = window.setInterval('iframe_xml_loaded();',100); |
179 |
dpavlin |
391 |
|
180 |
dpavlin |
534 |
// save some data for iframe_xml_loaded() |
181 |
|
|
window.xml_handler = handler; |
182 |
|
|
window.xml_url = url; |
183 |
|
|
window.xml_data = data; |
184 |
|
|
window.xml_result_handler = result_handler; |
185 |
|
|
return true; |
186 |
|
|
} |
187 |
|
|
|
188 |
|
|
clearTimeout(watchdog_id); |
189 |
|
|
debug("Browser incompatilibity: can't request XML document by one of supported methods"); |
190 |
|
|
return false; |
191 |
|
|
} |
192 |
|
|
|
193 |
|
|
catch(ex) { |
194 |
|
|
clearTimeout(watchdog_id); |
195 |
|
|
debug("clearTimeout = "+watchdog_id); |
196 |
|
|
debug ("CAUGHT EXCEPTION!"); |
197 |
|
|
result_handler(new Array()); |
198 |
|
|
return false; |
199 |
|
|
} |
200 |
|
|
|
201 |
|
|
return true; |
202 |
dpavlin |
391 |
} |
203 |
|
|
|
204 |
dpavlin |
496 |
function iframe_xml_loaded() { |
205 |
dpavlin |
534 |
debug("iframe_xmldoc_loaded"); |
206 |
|
|
if (! window.frames['xml_iframe']) return; |
207 |
|
|
var xml = eval('window.frames.xml_iframe.window.document'); |
208 |
|
|
if (xml) { |
209 |
dpavlin |
496 |
clearTimeout(window.iframe_timeout); |
210 |
dpavlin |
534 |
debug("calling handler with ("+window.xml_url+","+window.xml_data+",...)"); |
211 |
|
|
window.xml_handler(window.frames.xml_iframe.window.document, window.xml_url, window.xml_data, window.xml_result_handler); |
212 |
|
|
} else { |
213 |
|
|
debug("can't eval iframe with xml"); |
214 |
|
|
} |
215 |
dpavlin |
496 |
} |
216 |
|
|
|
217 |
dpavlin |
534 |
var data = new Array(); |
218 |
dpavlin |
391 |
|
219 |
dpavlin |
534 |
function loadData_intersect(xmldoc, url, pos, result_handler) { |
220 |
|
|
data = new Array(); |
221 |
|
|
if (loadData(xmldoc, url, pos, result_handler)) { |
222 |
|
|
intersect_results(data); |
223 |
|
|
search_query_left(result_handler); |
224 |
|
|
} else { |
225 |
|
|
debug("INTERNAL ERROR, Inconsistent index"); |
226 |
|
|
search_err="INTERNAL ERROR, Inconsistent index"; |
227 |
|
|
} |
228 |
|
|
} |
229 |
dpavlin |
391 |
|
230 |
dpavlin |
534 |
function loadData(xmldoc, url, pos, result_handler) { |
231 |
dpavlin |
391 |
|
232 |
dpavlin |
534 |
clearTimeout(watchdog_id); |
233 |
|
|
debug("clearTimeout = "+watchdog_id); |
234 |
dpavlin |
391 |
|
235 |
dpavlin |
534 |
debug ("loadData("+url+","+pos+")"); |
236 |
dpavlin |
391 |
|
237 |
dpavlin |
534 |
// Get all entries |
238 |
|
|
var entries = xmldoc.getElementsByTagName("e"); |
239 |
dpavlin |
391 |
|
240 |
dpavlin |
534 |
if (entries.length > pos) { |
241 |
|
|
// Get the links associated with this query |
242 |
|
|
var links = entries[pos].getElementsByTagName("l"); |
243 |
dpavlin |
391 |
|
244 |
dpavlin |
534 |
debug("loaded "+links.length+" links"); |
245 |
|
|
|
246 |
|
|
// Dynamically append results to output |
247 |
|
|
var ret = false; |
248 |
|
|
for(i=0; i<links.length; i++) { |
249 |
|
|
data.push(new Result( |
250 |
|
|
links[i].getAttribute("t"), |
251 |
|
|
links[i].firstChild.data, |
252 |
|
|
links[i].getAttribute("f")) |
253 |
|
|
); |
254 |
|
|
ret = true; |
255 |
|
|
} |
256 |
|
|
return ret; |
257 |
|
|
} else { |
258 |
|
|
debug("ERROR: seek to "+pos+" with only "+entries.length+" elements"); |
259 |
|
|
} |
260 |
dpavlin |
391 |
} |
261 |
|
|
|
262 |
dpavlin |
534 |
|
263 |
|
|
function search_query_left(result_handler) { |
264 |
|
|
if (query_left.length > 0) { |
265 |
|
|
doSearch(index_path, query_left, result_handler); |
266 |
|
|
} else { |
267 |
|
|
results.sort(sortResults); |
268 |
|
|
result_handler(results); |
269 |
|
|
} |
270 |
dpavlin |
391 |
} |
271 |
|
|
|
272 |
dpavlin |
534 |
// you may override this function to sort by something else |
273 |
|
|
function sortResults(a, b) { |
274 |
|
|
return a.frequency - b.frequency; |
275 |
|
|
} |
276 |
|
|
|
277 |
|
|
function traverseTree(xmldoc, url, query, result_handler) { |
278 |
|
|
clearTimeout(watchdog_id); |
279 |
|
|
debug("clearTimeout = "+watchdog_id); |
280 |
dpavlin |
391 |
|
281 |
dpavlin |
534 |
debug("traverseTree("+xmldoc+","+url+","+query+")"); |
282 |
dpavlin |
391 |
|
283 |
dpavlin |
534 |
var keys = xmldoc.getElementsByTagName("k"); |
284 |
|
|
var i; |
285 |
dpavlin |
391 |
|
286 |
dpavlin |
534 |
// support for wildcard |
287 |
|
|
var qlen = query.length; |
288 |
|
|
var wildcard = false; |
289 |
|
|
var query_full = query; |
290 |
|
|
if (query.charAt(qlen-1) == '*') { |
291 |
|
|
wildcard = true; |
292 |
|
|
query = query.substr(0,--qlen); |
293 |
|
|
debug("using wildcard "+query+"*"); |
294 |
|
|
} |
295 |
|
|
|
296 |
|
|
for(i = 0; i < keys.length; i++) { |
297 |
|
|
var key = keys[i].firstChild.data; |
298 |
|
|
|
299 |
|
|
if (wildcard) { |
300 |
|
|
key = key.substr(0,qlen); |
301 |
|
|
debug("wildcard key "+key+"*"); |
302 |
|
|
} |
303 |
|
|
|
304 |
|
|
debug("traverseTree: "+key+"=="+query); |
305 |
|
|
|
306 |
|
|
if (key != '' && key != null) { |
307 |
|
|
// Case where current key is greater than query, descend |
308 |
|
|
if (key > query) { |
309 |
|
|
if (key != '' && key != null) { |
310 |
|
|
if (! loadXML(url.replace(".xml","/"+convert(i)+".xml"), traverseTree,query_full,result_handler)) { |
311 |
|
|
debug("Unable to locate key "+query); |
312 |
|
|
result_handler(new Array()); |
313 |
|
|
} |
314 |
|
|
// make sure of garbage collection |
315 |
|
|
xmldoc=null; |
316 |
|
|
return; |
317 |
|
|
} |
318 |
|
|
} |
319 |
|
|
// Found it! |
320 |
|
|
else if (key==query) { |
321 |
|
|
if (wildcard) { |
322 |
|
|
data = new Array(); |
323 |
|
|
while (xmldoc && keys[i].firstChild.data.substr(0,qlen) == query) { |
324 |
|
|
var url2 = url; |
325 |
|
|
if (loadXML(url2.replace(/(\w+\.xml)/, "_$1"), loadData, i, result_handler)) { |
326 |
|
|
// add loaded data to results |
327 |
|
|
if (! results) { |
328 |
|
|
results = data; |
329 |
|
|
debug("wildcard loop: "+i+" created "+data.length+" results"); |
330 |
|
|
} else { |
331 |
|
|
for (var j=0; j<data.length; j++) { |
332 |
|
|
results.push(data[j]); |
333 |
|
|
} |
334 |
|
|
debug("wildcard loop: "+i+" added "+j+" results"); |
335 |
|
|
} |
336 |
|
|
|
337 |
|
|
} else { |
338 |
|
|
// this will break out of loop |
339 |
|
|
xmldoc = null; |
340 |
|
|
debug("wildcard loop stop at "+i); |
341 |
|
|
} |
342 |
|
|
i++; |
343 |
|
|
} |
344 |
|
|
debug("wildcard results: "+results.length); |
345 |
|
|
search_query_left(result_handler); |
346 |
|
|
return; |
347 |
|
|
} else { |
348 |
|
|
// exact match |
349 |
|
|
if (! loadXML(url.replace(/(\w+\.xml)/, "_$1"), loadData_intersect, i, result_handler)) { |
350 |
|
|
debug("ERROR: Unable to locate data "+query); |
351 |
|
|
result_handler(new Array()); |
352 |
|
|
} |
353 |
|
|
// make sure of garbage collection |
354 |
|
|
xmldoc=null; |
355 |
|
|
return; |
356 |
|
|
} |
357 |
|
|
} // key < query |
358 |
|
|
} // if key |
359 |
|
|
} // for |
360 |
|
|
|
361 |
|
|
// Look past the end... |
362 |
|
|
if (wildcard) query += '*'; |
363 |
|
|
|
364 |
|
|
if (keys.length == 0 || !loadXML(url.replace(".xml","/"+convert(i)+".xml"), traverseTree,query,result_handler)) { |
365 |
|
|
debug("Unable to locate key "+query); |
366 |
|
|
result_handler(new Array()); |
367 |
|
|
} |
368 |
|
|
|
369 |
|
|
// make sure of garbage collection |
370 |
|
|
xmldoc=null; |
371 |
|
|
return; |
372 |
dpavlin |
391 |
} |
373 |
|
|
|
374 |
dpavlin |
534 |
function doSearch(index_name,query, result_func) { |
375 |
dpavlin |
391 |
|
376 |
dpavlin |
534 |
//alert("doSearch("+index_name+","+query+")"); |
377 |
|
|
var pos=query.search(/[\s\+]/); |
378 |
|
|
if (index_name) index_path = index_name+'/'; |
379 |
dpavlin |
391 |
|
380 |
dpavlin |
534 |
if (pos < 0) { |
381 |
|
|
query_left = ""; |
382 |
|
|
} else { |
383 |
|
|
query_left = query.slice(pos+1); |
384 |
|
|
query = query.slice(0,pos); |
385 |
|
|
} |
386 |
|
|
|
387 |
|
|
if (! loadXML(index_path+"0.xml", traverseTree, query.toLowerCase(), result_func)) { |
388 |
|
|
debug("ERROR: Couldn't find main index 0.xml"); |
389 |
|
|
search_err = "INTERNAL ERROR: Unable to load main index 0.xml"; |
390 |
|
|
} |
391 |
dpavlin |
391 |
} |