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Matko Andjelinic, matko.andjelinic@gmail.com 2004-09-09 (contributed OO implementation) |
Matko Andjelinic, matko.andjelinic@gmail.com 2004-09-09 (contributed OO implementation) |
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*/ |
*/ |
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top.__bfilter_obj = new Array(); |
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function BFilter(arr) { |
function BFilter(arr) { |
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this.id_cache = Array(); |
this.id_cache = Array(); |
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// total number of hits |
// total number of hits |
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this.hits = 0; |
this.hits = 0; |
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// store reference to this object for later (YAK) |
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this.obj_count = top.__bfilter_obj.length; |
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top.__bfilter_obj[this.obj_count] = this; |
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// clear results html |
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this.results_html = ''; |
this.results_html = ''; |
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// show results after 0.2s |
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this.timeout = 200; |
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this.timeout_handle = null; |
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// this function is called for each result |
// this function is called for each result |
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this.result = function (arr) { |
this.result = function (arr) { |
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this.results_html += '<li><a href="'+arr[1]+'">'+ |
this.results_html += '<li><a href="'+arr[1]+'">'+ |
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if (this.id_cache[id]) { |
if (this.id_cache[id]) { |
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return this.id_cache[id]; |
return this.id_cache[id]; |
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} else { |
} else { |
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var el = document.getElementById(id); |
var el = self.document.getElementById(id); |
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if (el) { |
if (el) { |
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this.id_cache[id] = el; |
this.id_cache[id] = el; |
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return el; |
return el; |
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// modified binary search to find first element with substring |
// modified binary search to find first element with substring |
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BFilter.prototype.binarySearch = function (arr, find) { |
BFilter.prototype.binarySearch = function (arr, user_filter) { |
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if (!arr || typeof (find) == "undefined" || !arr.length) { |
if (!arr || typeof (user_filter) == "undefined" || !arr.length) { |
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return null; |
return null; |
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} |
} |
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var low = 0; |
var low = 0; |
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var mid = (low + high) / 2; |
var mid = (low + high) / 2; |
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var aTry = (mid < 1) ? 0 : parseInt(mid); |
var aTry = (mid < 1) ? 0 : parseInt(mid); |
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var curr = arr[aTry][0].substr(0,find.length).toLowerCase(); |
var curr = arr[aTry][0].substr(0,user_filter.length).toLowerCase(); |
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this.debug("low="+low+" high="+high+" lastTry="+lastTry+" "+aTry+": "+curr); |
this.debug("low="+low+" high="+high+" lastTry="+lastTry+" "+aTry+": "+curr); |
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if (curr < find) { |
if (curr < user_filter) { |
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low = aTry + 1; |
low = aTry + 1; |
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continue; |
continue; |
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} |
} |
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if (curr > find) { |
if (curr > user_filter) { |
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high = aTry - 1; |
high = aTry - 1; |
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continue; |
continue; |
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} |
} |
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if (curr == find) { |
if (curr == user_filter) { |
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high = aTry - 1; |
high = aTry - 1; |
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lastTry = aTry; |
lastTry = aTry; |
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continue; |
continue; |
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} |
} |
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} |
} |
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BFilter.prototype.filter = function (document, find) { |
BFilter.prototype.filter = function (user_filter) { |
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this.debug("set timeout for "+this.obj_count+" to "+this.timeout); |
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if (this.timeout_handle) { |
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clearTimeout(this.timeout_handle); |
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this.timeout_handle = null; |
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} |
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this.timeout_handle=setTimeout("top.__bfilter_obj["+this.obj_count+"].show_filter('"+user_filter.replace(/'/,"\\'")+"');", this.timeout); |
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return true; |
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} |
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BFilter.prototype.show_filter = function (user_filter) { |
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if (this.timeout_handle) { |
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clearTimeout(this.timeout_handle); |
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this.timeout_handle = null; |
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this.debug("timeout cleared"); |
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} |
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this.results('',1); |
this.results('',1); |
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this.hits = 0; |
this.hits = 0; |
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if (find.length < this.min_len) { |
if (user_filter.length < this.min_len) { |
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this.show_status(); |
this.show_status(); |
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return; |
return; |
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} |
} |
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this.debug("filter: '"+find+"'"); |
this.debug("filter: '"+user_filter+"'"); |
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var find_lc = find.toLowerCase(); |
var user_filter_lc = user_filter.toLowerCase(); |
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var part = find_lc.substr(0,this.min_len); |
var part = user_filter_lc.substr(0,this.min_len); |
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// no part found |
// no part found |
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if (! this.arr[part]) { |
if (! this.arr[part]) { |
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this.show_status(" for <em>"+find+"</em><br>"); |
this.show_status(" for <em>"+user_filter+"</em><br>"); |
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this.debug("no part "+part); |
this.debug("no part "+part); |
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return; |
return; |
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} |
} |
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var i; |
var i; |
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// full part? (optimization) |
// full part? (optimization) |
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if (find.length == this.min_len) { |
if (user_filter.length == this.min_len) { |
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for (i = 0; i < this.arr[part].length; i++) { |
for (i = 0; i < this.arr[part].length; i++) { |
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this.result(this.arr[part][i]); |
this.result(this.arr[part][i]); |
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this.hits++; |
this.hits++; |
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this.results(); |
this.results(); |
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} else { |
} else { |
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var from = this.binarySearch(this.arr[part], find_lc); |
var from = this.binarySearch(this.arr[part], user_filter_lc); |
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if (from != null) { |
if (from != null) { |
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this.debug("loop "+from+" ... "+this.arr[part].length); |
this.debug("loop "+from+" ... "+this.arr[part].length); |
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for(i = from ; i < this.arr[part].length ; i++) { |
for(i = from ; i < this.arr[part].length ; i++) { |
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if (this.arr[part][i][0].substring(0,find.length).toLowerCase() != find_lc) { |
if (this.arr[part][i][0].substring(0,user_filter.length).toLowerCase() != user_filter_lc) { |
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this.debug("loop exit at "+i); |
this.debug("loop exit at "+i); |
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break; |
break; |
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} |
} |
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} |
} |
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this.show_status(" for <em>"+find+"</em>"); |
this.show_status(" for <em>"+user_filter+"</em>"); |
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} |
} |
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