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Quicksilver string ranking algorithm in PHP

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quicksilver_score.php
PHP
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<?
 
// Quicksilver Score
//
// A port of the Quicksilver string ranking algorithm
// (re-ported from Javascript to PHP by Kenzie Campbell)
// http://route19.com/logbook/view/quicksilver-score-in-php
//
// score("hello world","axl") //=> 0.0
// score("hello world","ow") //=> 0.6
// score("hello world","hello world") //=> 1.0
//
// The Javascript code is available here
// http://orderedlist.com/articles/live-search-with-quicksilver-style/
// http://orderedlist.com/demos/quicksilverjs/javascripts/quicksilver.js
//
// 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.
function score($string,$abbreviation,$offset=0)
{
$string = strtolower($string);
$abbreviation = strtolower($abbreviation);
if(strlen($abbreviation) == 0) return 0.9;
if(strlen($abbreviation) > strlen($string)) return 0.0;
for ($i = strlen($abbreviation); $i > 0; $i--)
{
$sub_abbreviation = substr($abbreviation,0,$i);
$index = strpos($string,$sub_abbreviation);
if($index<0 or $index===false) continue;
if($index + strlen($abbreviation) > strlen($string) + $offset) continue;
$next_string = substr($string,$index+strlen($sub_abbreviation));
$next_abbreviation = null;
if($i >= strlen($abbreviation)) $next_abbreviation = '';
else $next_abbreviation = substr($abbreviation,$i);
$remaining_score = score($next_string,$next_abbreviation,$offset+$index);
if ($remaining_score > 0)
{
$score = strlen($string)-strlen($next_string);
if($index != 0)
{
$j = 0;
$c = ord(substr($string,$index-1));
if($c==32 || $c == 9)
{
for($j=($index-2); $j >= 0; $j--)
{
$c = ord(substr($string,$j,1));
$score -= (($c == 32 || $c == 9) ? 1 : 0.15);
}
}
else $score -= $index;
}
$score += $remaining_score * strlen($next_string);
$score /= strlen($string);
return $score;
}
}
return 0.0;
}
 
?>

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