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| Viewing file: Select action/file-type: // qs_score - Quicksilver Score
//
// A port of the Quicksilver string ranking algorithm
//
// "hello world".score("axl") //=> 0.0
// "hello world".score("ow") //=> 0.6
// "hello world".score("hello world") //=> 1.0
//
// Tested in Firefox 2 and Safari 3
//
// The Quicksilver code is available here
// http://code.google.com/p/blacktree-alchemy/
// http://blacktree-alchemy.googlecode.com/svn/trunk/Crucible/Code/NSString+BLTRRanking.m
//
// The MIT License
//
// Copyright (c) 2008 Lachie Cox
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
String.prototype.score = function(abbreviation,offset) {
offset = offset || 0 // TODO: I think this is unused... remove
if(abbreviation.length == 0) return 0.9
if(abbreviation.length > this.length) return 0.0
for (var i = abbreviation.length; i > 0; i--) {
var sub_abbreviation = abbreviation.substring(0,i)
var index = this.indexOf(sub_abbreviation)
if(index < 0) continue;
if(index + abbreviation.length > this.length + offset) continue;
var next_string = this.substring(index+sub_abbreviation.length)
var next_abbreviation = null
if(i >= abbreviation.length)
next_abbreviation = ''
else
next_abbreviation = abbreviation.substring(i)
var remaining_score = next_string.score(next_abbreviation,offset+index)
if (remaining_score > 0) {
var score = this.length-next_string.length;
if(index != 0) {
var j = 0;
var c = this.charCodeAt(index-1)
if(c==32 || c == 9) {
for(var j=(index-2); j >= 0; j--) {
c = this.charCodeAt(j)
score -= ((c == 32 || c == 9) ? 1 : 0.15)
}
// XXX maybe not port this heuristic
//
// } else if ([[NSCharacterSet uppercaseLetterCharacterSet] characterIsMember:[self characterAtIndex:matchedRange.location]]) {
// for (j = matchedRange.location-1; j >= (int) searchRange.location; j--) {
// if ([[NSCharacterSet uppercaseLetterCharacterSet] characterIsMember:[self characterAtIndex:j]])
// score--;
// else
// score -= 0.15;
// }
} else {
score -= index
}
}
score += remaining_score * next_string.length
score /= this.length;
return score
}
}
return 0.0
} |
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