27 |
|
|
28 |
// Constants |
// Constants |
29 |
var conversion = new String |
var conversion = new String |
30 |
("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXY"); |
("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXY"); |
31 |
|
|
32 |
// State variables |
// State variables |
33 |
var query_left = ""; |
var query_left = ""; |
35 |
var results = null; |
var results = null; |
36 |
var index_path = ""; |
var index_path = ""; |
37 |
|
|
38 |
|
// wildcard data about found keys URLs and position |
39 |
|
var wildcard_url_pos = new Array(); |
40 |
|
|
41 |
var watchdog_id = 0; |
var watchdog_id = 0; |
42 |
var watchdog_callback = null; |
var watchdog_callback = null; |
43 |
|
|
44 |
// Object to hold search results |
// Object to hold search results |
45 |
function Result(title, link, freq) |
function Result(title, link, freq) { |
46 |
{ |
this.title=title; |
47 |
this.title=title; |
this.link=link; |
48 |
this.link=link; |
this.frequency=Number(freq); |
|
this.frequency=Number(freq); |
|
49 |
} |
} |
50 |
|
|
51 |
// Function to merge (intersect) two result sets |
// Function to merge (intersect) two result sets |
52 |
function intersect_results(data) |
function intersect_results(data) { |
53 |
{ |
// If there are no stored results, then these are the results |
54 |
// If there are no stored results, then these are the results |
if (! results) { |
55 |
if(!results) |
results = data; |
56 |
{ |
return; |
57 |
results = data; |
} |
58 |
return; |
|
59 |
} |
var output=new Array(); |
60 |
|
|
61 |
var output=new Array(); |
// There are existing results, to do an intersect... |
62 |
|
for (var i=0; i<results.length; i++) { |
63 |
// There are existing results, to do an intersect... |
for (var j=0; j<data.length; j++) { |
64 |
for(var i=0; i<results.length; i++) |
if (data[j].title == results[i].title) { |
65 |
{ |
results[i].frequency += data[j].frequency; |
66 |
for(var j=0; j<data.length; j++) |
output.push(results[i]); |
67 |
{ |
break; |
68 |
if(data[j].title == results[i].title) |
} |
69 |
{ |
} |
70 |
results[i].frequency += data[j].frequency; |
} |
71 |
output.push(results[i]); |
|
72 |
break; |
results = output; |
|
} |
|
|
} |
|
|
} |
|
|
|
|
|
results = output; |
|
|
} |
|
|
|
|
|
/* |
|
|
From David Flanagan's, _Javascript:_The Definitive_Guide_, pg. 294-5, |
|
|
published by O'Reilly, 4th edition, 2002 |
|
|
*/ |
|
|
function debug(msg) |
|
|
{ |
|
|
return; // Disable debugging |
|
|
|
|
|
if(!debug.box) |
|
|
{ |
|
|
debug.box = document.createElement("div"); |
|
|
debug.box.setAttribute("style", |
|
|
"background-color:white" + |
|
|
"font-family: monospace; " + |
|
|
"border: solid black 3px; "+ |
|
|
"padding: 10px;"); |
|
|
|
|
|
document.body.appendChild(debug.box); |
|
|
debug.box.innerHTML = "<h1 style='test-align:cent'>Debugging Output</h1>"; |
|
|
} |
|
|
|
|
|
var p = document.createElement("p"); |
|
|
p.appendChild(document.createTextNode(msg)); |
|
|
debug.box.appendChild(p); |
|
73 |
} |
} |
74 |
|
|
75 |
// |
var debug_div = null; |
76 |
|
|
77 |
|
function debug(msg) { |
78 |
|
|
79 |
|
// return; // Disable debugging |
80 |
|
|
81 |
|
if (! debug_div) debug_div = document.getElementById('debug'); |
82 |
|
|
83 |
|
// this will create debug div if it doesn't exist. |
84 |
|
if (! debug_div) { |
85 |
|
debug_div = document.createElement('div'); |
86 |
|
if (document.body) document.body.appendChild(debug_div); |
87 |
|
else debug_div = null; |
88 |
|
} |
89 |
|
if (debug_div) { |
90 |
|
debug_div.appendChild(document.createTextNode(msg)); |
91 |
|
debug_div.appendChild(document.createElement("br")); |
92 |
|
} |
93 |
|
} |
94 |
|
|
95 |
// Convert a number into a base 62 alphanumeric number string |
// Convert a number into a base 62 alphanumeric number string |
96 |
function convert(num) |
function convert(num) { |
97 |
{ |
var base = conversion.length; |
98 |
var base = conversion.length; |
var pow = 1; |
99 |
var pow = 1; |
var pos = 0; |
100 |
var pos = 0; |
var out = ""; |
101 |
var out = ""; |
|
102 |
|
if (num == 0) return "0"; |
103 |
if(num == 0) |
|
104 |
{ |
while (num > 0) { |
105 |
return "0"; |
pos = num % base; |
106 |
} |
out = conversion.charAt(pos) + out; |
107 |
|
num = Math.floor(num/base); |
108 |
while (num > 0) |
pow *= base; |
109 |
{ |
} |
110 |
pos = num % base; |
|
111 |
out = conversion.charAt(pos) + out; |
return out; |
112 |
num = Math.floor(num/base); |
} |
113 |
pow *= base; |
|
114 |
} |
function watchdog() { |
115 |
|
debug ("TIMEOUT!"); |
116 |
return out; |
watchdog_callback(new Array()); |
|
} |
|
|
|
|
|
function watchdog() |
|
|
{ |
|
|
debug ("TIMEOUT!"); |
|
|
watchdog_callback(new Array()); |
|
117 |
} |
} |
118 |
|
|
119 |
|
var xmldoc; |
120 |
|
|
121 |
// This function loads the XML document from the specified URL, and when |
// This function loads the XML document from the specified URL, and when |
122 |
// it is fully loaded, passes that document and the url to the specified |
// it is fully loaded, passes that document and the url to the specified |
123 |
// handler function. This function works with any XML document |
// handler function. This function works with any XML document |
124 |
function loadXML(url, handler, data, result_handler) |
|
125 |
{ |
function loadXML(url, handler, data, result_handler) { |
126 |
debug("loadXML("+url+","+data+")"); |
debug("loadXML("+url+","+data+")"); |
127 |
|
|
128 |
// Timeout operation in 10 seconds |
// Timeout operation in 10 seconds |
129 |
watchdog_callback = result_handler; |
watchdog_callback = result_handler; |
130 |
watchdog_id=setTimeout("watchdog()", 20000); |
watchdog_id=setTimeout("watchdog()", 20000); |
131 |
|
|
132 |
debug("setTimeout = "+watchdog_id); |
//debug("setTimeout = "+watchdog_id); |
133 |
|
|
134 |
try |
try { |
135 |
{ |
// Use the standard DOM Level 2 technique, if it is supported |
136 |
// Use the standard DOM Level 2 technique, if it is supported |
if (document.implementation && document.implementation.createDocument) { |
137 |
if (document.implementation && document.implementation.createDocument) |
// Create a new Document object |
138 |
{ |
xmldoc = document.implementation.createDocument("", "", null); |
139 |
// Create a new Document object |
|
140 |
var xmldoc = document.implementation.createDocument("", "", null); |
// Specify what should happen when it finishes loading |
141 |
|
xmldoc.onload = function() { handler(xmldoc, url, data, result_handler); } |
142 |
// Specify what should happen when it finishes loading |
|
143 |
xmldoc.onload = function() { handler(xmldoc, url, data, result_handler); } |
//xmldoc.onerror = docError; |
144 |
|
//xmldoc.addEventListener("load",docError,false); |
145 |
//xmldoc.onerror = docError; |
|
146 |
//xmldoc.addEventListener("load",docError,false); |
// And tell it what URL to load |
147 |
|
xmldoc.load(url); |
148 |
// And tell it what URL to load |
return true; |
149 |
xmldoc.load(url); |
} |
150 |
} |
// Otherwise use Microsoft's proprietary API for Internet Explorer |
151 |
// Otherwise use Microsoft's proprietary API for Internet Explorer |
// Something about not following standards once again |
152 |
// Something about not following standards once again |
else if (window.ActiveXObject) { |
153 |
else if (window.ActiveXObject) |
xmldoc = new ActiveXObject("Microsoft.XMLDOM"); // Create doc. |
154 |
{ |
if (! xmldoc) xmldoc = new ActiveXObject("MSXML2.DOMDocument"); // Create doc. |
155 |
//var xmldoc = new ActiveXObject("MSXML2.DOMDocument"); // Create doc. |
// Specify onload |
156 |
var xmldoc = new ActiveXObject("Microsoft.XMLDOM"); // Create doc. |
xmldoc.onreadystatechange = function() { |
157 |
// Specify onload |
if (xmldoc.readyState == 4) handler(xmldoc, url, data, result_handler); |
158 |
xmldoc.onreadystatechange = function() |
} |
159 |
{ |
xmldoc.load(url); // Start loading! |
160 |
if (xmldoc.readyState == 4) handler(xmldoc, url, data, result_handler); |
return true; |
161 |
} |
} |
162 |
xmldoc.load(url); // Start loading! |
// else fallback on usage of iframes to load xml (Opera 7.53 without Java and maybe old Mac browsers) |
163 |
} |
else { |
164 |
} |
debug("using iframe xml loader - experimental and slow"); |
165 |
catch(ex) |
if (! window.xml_iframe) { |
166 |
{ |
debug("creating iframe"); |
167 |
clearTimeout(watchdog_id); |
window.xml_iframe = document.createElement('div'); |
168 |
debug("clearTimeout = "+watchdog_id); |
window.xml_iframe.innerHTML = '<iframe src="'+url+'" name="xml_iframe" height="0" width="0" style="display: none;"></iframe>'; |
169 |
debug ("CAUGHT EXCEPTION!"); |
document.body.appendChild(window.xml_iframe); |
170 |
result_handler(new Array()); |
} else { |
171 |
return false; |
debug("loading xml in existing iframe"); |
172 |
} |
window.frames.xml_iframe.window.document.location.href = url; |
173 |
|
} |
174 |
return true; |
|
175 |
} |
// set timeout to re-check if iframe is loaded |
176 |
|
window.iframe_timeout = window.setInterval('iframe_xml_loaded();',100); |
177 |
function loadData(xmldoc, url, pos, result_handler) |
|
178 |
{ |
// save some data for iframe_xml_loaded() |
179 |
clearTimeout(watchdog_id); |
window.xml_handler = handler; |
180 |
debug("clearTimeout = "+watchdog_id); |
window.xml_url = url; |
181 |
|
window.xml_data = data; |
182 |
debug ("loadData("+url+","+pos+")"); |
window.xml_result_handler = result_handler; |
183 |
|
return true; |
184 |
var data = new Array(); |
} |
185 |
|
|
186 |
// Get all entries |
clearTimeout(watchdog_id); |
187 |
var entries = xmldoc.getElementsByTagName("e"); |
debug("Browser incompatilibity: can't request XML document by one of supported methods"); |
188 |
|
return false; |
189 |
if(entries.length > pos) |
} |
190 |
{ |
|
191 |
// Get the links associated with this query |
catch(ex) { |
192 |
var links = entries[pos].getElementsByTagName("l"); |
clearTimeout(watchdog_id); |
193 |
|
//debug("clearTimeout = "+watchdog_id); |
194 |
// Dynamically append results to output |
debug ("CAUGHT EXCEPTION!"); |
195 |
for(var i=0; i<links.length; i++) |
result_handler(new Array()); |
196 |
{ |
return false; |
197 |
data.push(new Result(links[i].getAttribute("t"), |
} |
198 |
links[i].firstChild.data, |
|
199 |
links[i].getAttribute("f"))); |
return true; |
200 |
} |
} |
201 |
|
|
202 |
intersect_results(data); |
function iframe_xml_loaded() { |
203 |
|
debug("iframe_xmldoc_loaded"); |
204 |
if(query_left.length > 0) |
if (! window.frames['xml_iframe']) return; |
205 |
{ |
var xml = eval('window.frames.xml_iframe.window.document'); |
206 |
doSearch(index_path, query_left, result_handler); |
if (xml) { |
207 |
} |
clearTimeout(window.iframe_timeout); |
208 |
else |
debug("calling handler with ("+window.xml_url+","+window.xml_data+",...)"); |
209 |
{ |
window.xml_handler(window.frames.xml_iframe.window.document, window.xml_url, window.xml_data, window.xml_result_handler); |
210 |
results.sort(sortResults); |
} else { |
211 |
result_handler(results); |
debug("can't eval iframe with xml"); |
212 |
} |
} |
213 |
} |
} |
214 |
else |
|
215 |
{ |
var data = new Array(); |
216 |
debug("INTERNAL ERROR, Inconsistent index"); |
|
217 |
search_err="INTERNAL ERROR, Inconsistent index"; |
function loadData_intersect(xmldoc, url, pos, result_handler) { |
218 |
} |
data = new Array(); |
219 |
} |
if (loadData(xmldoc, url, pos)) { |
220 |
|
intersect_results(data); |
221 |
function sortResults(a, b) |
search_query_left(result_handler); |
222 |
{ |
} else { |
223 |
return a.frequency - b.frequency; |
debug("INTERNAL ERROR, Inconsistent index"); |
224 |
} |
search_err="INTERNAL ERROR, Inconsistent index"; |
225 |
|
} |
226 |
function traverseTree(xmldoc, url, query, result_handler) |
} |
227 |
{ |
|
228 |
clearTimeout(watchdog_id); |
function loadData(xmldoc, url, pos) { |
229 |
debug("clearTimeout = "+watchdog_id); |
|
230 |
|
clearTimeout(watchdog_id); |
231 |
|
//debug("clearTimeout = "+watchdog_id); |
232 |
|
|
233 |
|
debug ("loadData("+url+","+pos+")"); |
234 |
|
|
235 |
|
// Get all entries |
236 |
|
var entries = xmldoc.getElementsByTagName("e"); |
237 |
|
|
238 |
|
if (entries.length > pos) { |
239 |
|
// Get the links associated with this query |
240 |
|
var links = entries[pos].getElementsByTagName("l"); |
241 |
|
|
242 |
|
debug("loaded "+links.length+" links"); |
243 |
|
|
244 |
|
// Dynamically append results to output |
245 |
|
var ret = false; |
246 |
|
for(i=0; i<links.length; i++) { |
247 |
|
data.push(new Result( |
248 |
|
links[i].getAttribute("t"), |
249 |
|
links[i].firstChild.data, |
250 |
|
links[i].getAttribute("f")) |
251 |
|
); |
252 |
|
ret = true; |
253 |
|
} |
254 |
|
return ret; |
255 |
|
} else { |
256 |
|
debug("ERROR: seek to "+pos+" with only "+entries.length+" elements"); |
257 |
|
} |
258 |
|
} |
259 |
|
|
260 |
|
|
261 |
|
function search_query_left(result_handler) { |
262 |
|
if (query_left.length > 0) { |
263 |
|
doSearch(index_path, query_left, result_handler); |
264 |
|
} else { |
265 |
|
results.sort(sortResults); |
266 |
|
result_handler(results); |
267 |
|
} |
268 |
|
} |
269 |
|
|
270 |
|
// you may override this function to sort by something else |
271 |
|
function sortResults(a, b) { |
272 |
|
return a.frequency - b.frequency; |
273 |
|
} |
274 |
|
|
275 |
|
function end_traverseTree(wildcard,query,result_handler) { |
276 |
|
if (! wildcard) { |
277 |
|
debug("Unable to locate key "+query); |
278 |
|
result_handler(new Array()); |
279 |
|
} else { |
280 |
|
debug("wildcard "+query+" produced "+(wildcard_url_pos.length / 2)+" results: "+wildcard_url_pos.join(" ")); |
281 |
|
} |
282 |
|
|
283 |
|
} |
284 |
|
|
285 |
|
function traverseTree(xmldoc, url, query, result_handler) { |
286 |
|
clearTimeout(watchdog_id); |
287 |
|
//debug("clearTimeout = "+watchdog_id); |
288 |
|
|
289 |
debug("traverseTree("+xmldoc+","+url+","+query+")"); |
debug("traverseTree("+xmldoc+","+url+","+query+")"); |
290 |
|
|
291 |
|
var keys = xmldoc.getElementsByTagName("k"); |
292 |
|
var i; |
293 |
|
|
294 |
|
// support for wildcard |
295 |
|
var qlen = query.length; |
296 |
|
var wildcard = false; |
297 |
|
var query_full = query; |
298 |
|
if (query.charAt(qlen-1) == '*') { |
299 |
|
wildcard = true; |
300 |
|
query = query.substr(0,--qlen); |
301 |
|
debug("using wildcard "+query+"*"); |
302 |
|
} |
303 |
|
|
304 |
|
for(i = 0; i < keys.length; i++) { |
305 |
|
var key = keys[i].firstChild.data; |
306 |
|
|
307 |
|
if (wildcard) key = key.substr(0,qlen); |
308 |
|
|
309 |
|
debug("? "+key+" -- "+query); |
310 |
|
|
311 |
|
if (key != '' && key != null) { |
312 |
|
// Case where current key is greater than query, descend |
313 |
|
if (key > query) { |
314 |
|
if (! loadXML(url.replace(".xml","/"+convert(i)+".xml"), traverseTree, query_full, result_handler)) { |
315 |
|
end_traverseTree(wildcard, query_full, result_handler); |
316 |
|
} |
317 |
|
// make sure of garbage collection |
318 |
|
xmldoc=null; |
319 |
|
return; |
320 |
|
} |
321 |
|
// Found it! |
322 |
|
else if (key==query) { |
323 |
|
if (wildcard) { |
324 |
|
wildcard_url_pos.push(url.replace(/(\w+\.xml)/, "_$1")); |
325 |
|
wildcard_url_pos.push(i); |
326 |
|
debug("+"+i+": "+keys[i].firstChild.data); |
327 |
|
} else { |
328 |
|
// exact match |
329 |
|
if (! loadXML(url.replace(/(\w+\.xml)/, "_$1"), loadData_intersect, i, result_handler)) { |
330 |
|
debug("ERROR: Unable to locate data "+query_full); |
331 |
|
result_handler(new Array()); |
332 |
|
} |
333 |
|
// make sure of garbage collection |
334 |
|
xmldoc=null; |
335 |
|
return; |
336 |
|
} |
337 |
|
} // key < query |
338 |
|
} // if key |
339 |
|
} // for |
340 |
|
|
341 |
|
// Look past the end... |
342 |
|
if (keys.length == 0 || !loadXML(url.replace(".xml","/"+convert(i)+".xml"), traverseTree, query_full, result_handler)) { |
343 |
|
end_traverseTree(wildcard, query_full, result_handler); |
344 |
|
} |
345 |
|
|
346 |
|
// make sure of garbage collection |
347 |
|
xmldoc=null; |
348 |
|
return; |
349 |
|
} |
350 |
|
|
351 |
var keys = xmldoc.getElementsByTagName("k"); |
function doSearch(index_name,query, result_func) { |
|
var i; |
|
352 |
|
|
353 |
for(i = 0; i < keys.length; i++) |
//alert("doSearch("+index_name+","+query+")"); |
354 |
{ |
var pos=query.search(/[\s\+]/); |
355 |
var key = keys[i].firstChild.data; |
if (index_name) index_path = index_name+'/'; |
356 |
debug("traverseTree: key="+key+" query="+query); |
|
357 |
if(key != '' && key != null) |
if (pos < 0) { |
358 |
{ |
query_left = ""; |
359 |
// Case where current key is greater than query, descend |
} else { |
360 |
if(key > query) |
query_left = query.slice(pos+1); |
361 |
{ |
query = query.slice(0,pos); |
362 |
if(key != '' && key != null) |
} |
363 |
{ |
|
364 |
if(!loadXML(url.replace(".xml","/"+convert(i)+".xml"), |
if (! loadXML(index_path+"0.xml", traverseTree, query.toLowerCase(), result_func)) { |
365 |
traverseTree,query,result_handler)) |
debug("ERROR: Couldn't find main index 0.xml"); |
366 |
{ |
search_err = "INTERNAL ERROR: Unable to load main index 0.xml"; |
367 |
debug("Unable to locate key "+query); |
} |
|
result_handler(new Array()); |
|
|
} |
|
|
// make sure of garbage collection |
|
|
xmldoc=null; |
|
|
return; |
|
|
} |
|
|
} |
|
|
// Found it! |
|
|
else if(key==query) |
|
|
{ |
|
|
if(!loadXML(url.replace(/(\w+\.xml)/, "_$1"), |
|
|
loadData, i, result_handler)) |
|
|
{ |
|
|
debug("ERROR: Unable to locate data "+query); |
|
|
result_handler(new Array()); |
|
|
} |
|
|
// make sure of garbage collection |
|
|
xmldoc=null; |
|
|
return; |
|
|
} |
|
|
} |
|
|
} |
|
|
// Look past the end... |
|
|
if(keys.length == 0 || !loadXML(url.replace(".xml","/"+convert(i)+".xml"), |
|
|
traverseTree,query,result_handler)) |
|
|
{ |
|
|
debug("Unable to locate key "+query); |
|
|
result_handler(new Array()); |
|
|
} |
|
|
// make sure of garbage collection |
|
|
xmldoc=null; |
|
|
return; |
|
|
} |
|
|
|
|
|
function doSearch(index_name,query, result_func) |
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{ |
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//alert("doSearch("+index_name+","+query+")"); |
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var pos=query.search(/[\s\+]/); |
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if (index_name) index_path = index_name+'/'; |
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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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if(!loadXML(index_path+"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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368 |
} |
} |