distance::getJWDistance() - Code Metrics - Inspection of "implemented common distance algorithms with some c..." - manuwhat/similar-text - Measure and Improve Code Quality continuously with Scrutinizer

Passed
Pull Request — master (#10)

by Akpé Aurelle Emmanuel Moïse
created 2019-04-29 06:59 UTC
distance::getJWDistance() A

↳ Parent: distance
Complexity

Conditions	3
Paths	3
Size

Total Lines	16
Code Lines	11
Duplication

Lines	0
Ratio	0 %
Importance

Changes
Metric	Value
eloc	11
dl	0
loc	16
rs	9.9
c	0
b	0
f	0
cc	3
nc	3
nop	4
<?php

/**
*
* @Name : similar-text
* @Programmer : Akpé Aurelle Emmanuel Moïse Zinsou
* @Date : 2019-04-01
* @Released under : https://github.com/manuwhat/similar-text/blob/master/LICENSE
* @Repository : https://github.com/manuwhat/similar
*
**/


namespace EZAMA{
    class distance extends complexCommonTextSimilarities
    {
        public static function jaroWinkler($a, $b, $round=2)
        {
            if (!is_string($a)||!is_string($b)) {
                return false;
            }
            static $distance=array();
            static $previous=array();
            if (array($a,$b)===$previous) {
                return $distance;
            }
            $previous=array($a,$b);
            return self::getJWDistance($a, $b, $distance, $round);
        }
        
        
        
        private static function getJWDistance(&$a, &$b, &$distance, $round)
        {
            extract(self::prepareJaroWinkler($a, $b));
            for ($i=0,$min=min(count($a), count($b)),$t=0;$i<$min;$i++) {
                if ($a[$i]!==$b[$i]) {
                    $t++;
                }
            }
            $t/=2;
            $distance['jaro']=1/3*($corresponding/$ca+$corresponding/$cb+($corresponding-$t)/$corresponding);
            $distance['jaro-winkler']=$distance['jaro']+(min($longCommonSubstr, 4)*0.1*(1-$distance['jaro']));
            $distance=array_map(function ($v) use ($round) {
                return round($v, $round);
            }, $distance);
            
            return $distance;
        }
        
        private static function prepareJaroWinkler(&$a, &$b)
        {
            $a=self::split($a);
            $b=self::split($b);
            $transpositions=array('a'=>array(),'b'=>array(),'corresponding'=>0,'longCommonSubstr'=>0,'ca'=>count($a),'cb'=>count($b));
            $transpositions=array('a'=>array(),'b'=>array(),'corresponding'=>0,'longCommonSubstr'=>0,'ca'=>count(/** @scrutinizer ignore-type */ $a),'cb'=>count($b));
            $Δ=max($transpositions['ca'], $transpositions['cb'])/2-1;
            self::jwMatches($a, $b, $transpositions, $Δ);
            ksort($transpositions['a']);
            ksort($transpositions['b']);
            $transpositions['a']=array_values($transpositions['a']);
            $transpositions['b']=array_values($transpositions['b']);
            return $transpositions;
        }
        
        private static function jwMatches(&$a, &$b, &$transpositions, $Δ)
        {
            foreach ($a as $ind=>$chr) {
                foreach ($b as $index=>$char) {
                    self::_jwMatches($chr, $char, $index, $ind, $transpositions, $Δ);
                }
            }
        }
        
        private static function _jwMatches($chr, $char, $index, $ind, &$transpositions, $Δ)
        {
            if ($chr===$char&&(abs($index-$ind)<=$Δ)) {
                if ($ind!==$index) {
                    $transpositions['a'][$ind]=$chr;
                    $transpositions['b'][$index]=$char;
                } else {
                    if ($ind-1<=$transpositions['longCommonSubstr']) {
                        $transpositions['longCommonSubstr']++;
                    }
                }
                $transpositions['corresponding']++;
            }
        }
        
        
        public static function hamming($a, $b)
        {
            if (!is_string($a)||!is_string($b)||(strlen($a)!==strlen($b))) {
                return false;
            }
            static $distance=0;
            static $previous=array();
            if (array($a,$b)===$previous) {
                return $distance;
            }
            $previous=array($a,$b);
            $a=self::split($a);
            $b=self::split($b);
            $distance=count(array_diff_assoc($a, $b));
            $distance=count(array_diff_assoc($a, /** @scrutinizer ignore-type */ $b));
            return $distance;
        }
        
        public static function dice($a, $b, $round=2)
        {
            if ($distance=in_array(self::handleVeryCommonDiceCases($a, $b), array(false,0.0,1.0), true)) {
                return $distance;
            }
            static $distance=0;
            static $previous=array();
            if (array($a,$b)===$previous) {
                return $distance;
            }
            $previous=array($a,$b);
            $a=self::split($a, 2);
            $b=self::split($b, 2);
            return self::getDiceDistance($distance, $a, $b, $round);
class A
{
    function getObject()
    {
        return null;
    }

}

$a = new A();
if ($a->getObject()) {
        }
        
        private static function handleVeryCommonDiceCases(&$a, &$b)
        {
            if (!is_string($a)||!is_string($b)) {
                return false;
            }
            if (empty($a)||empty($b)) {
                return 0.0;
            }
            if ($a===$b) {
                return 1.0;
            }
        }
        
        private static function getDiceDistance(&$distance, &$a, &$b, $round)
        {
            $ca=($caGrams=count($a))*2-self::getEndStrLen($a);
            $cb=($cbGrams=count($b))*2-self::getEndStrLen($b);
            $distance=round(2*count($caGrams>$cbGrams?array_intersect($a, $b):array_intersect($b, $a))/($ca+$cb), $round);
        }
        
        private static function getEndStrLen($a)
        {
            if (function_exists('array_key_last')) {
                $end=array_key_last($a);
                $end=(isset($end[1]))?0:1;
            } else {
                $end=end($a);
                $end=(isset($end[1]))?0:1;
                reset($a);
            }
            return $end;
        }
        
        public static function levenshtein($a, $b)
        {
            if (!is_string($a)||!is_string($b)) {
                return false;
            }
            
            
            static $distance=0;
            static $previous=array();
            if (array($a,$b)===$previous) {
                return $distance;
            }
            $previous=array($a,$b);
            $a=self::split($a);
            $b=self::split($b);
            $ca = count($a);
            $ca = count(/** @scrutinizer ignore-type */ $a);
            $cb = count($b);
            $dis = range(0, $cb);
            self::BuildLevenshteinCostMatrix($a, $b, $ca, $cb, $dis);

            return $distance=$dis[$cb];
        }
        
        
        public static function levenshteinDamerau($a, $b)
        {
            if (!is_string($a)||!is_string($b)) {
                return false;
            }
              
            static $distance=0;
            static $previous=array();
            if (array($a,$b)===$previous) {
                return $distance;
            }
            $previous=array($a,$b);
            $a=self::split($a);
            $b=self::split($b);
            $ca = count($a);
            $ca = count(/** @scrutinizer ignore-type */ $a);
            $cb = count($b);
            $dis = range(0, $cb);
            self::BuildLevenshteinCostMatrix($a, $b, $ca, $cb, $dis, true);
        
            return $distance=$dis[$cb];
        }
        
        private static function BuildLevenshteinCostMatrix($a, $b, $ca, $cb, &$dis, $damerau=false)
        {
            $dis_new=array();
            for ($x=1;$x<=$ca;$x++) {
                $dis_new[0]=$x;
                for ($y=1;$y<=$cb;$y++) {
                    self::costMatrix($a, $b, $dis_new, $dis, $damerau, $x, $y);
                }
                $dis = $dis_new;
            }
        }
        
        private static function costMatrix(&$a, &$b, &$dis_new, &$dis, $damerau, $x, $y)
        {
            $c = ($a[$x-1] == $b[$y-1])?0:1;
            $dis_new[$y] = min($dis[$y]+1, $dis_new[$y-1]+1, $dis[$y-1]+$c);
            if ($damerau) {
                if ($x > 1 && $y > 1 && $a[$x-1] == $b[$y-2] && $a[$x-2] == $b[$y-1]) {
                    $dis_new[$y]= min($dis_new[$y-1], $dis[$y-3] + $c) ;
                }
            }
        }
    }
    
    
}

manuwhat / similar-text

Pull Request — master (#10)

distance::getJWDistance() A

Complexity

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Duplication

Importance

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