EZAMA\diceDistance

Complexity

Total Complexity

15

Size/Duplication

Total Lines	50
Duplicated Lines	0 %

Importance

Changes

0

4 Methods

Rating	Name	Duplication	Size	Complexity
A	dice()	0	15	3
A	getEndStrLen()	0	11	4
A	diceDistance()	0	5	2
A	handleVeryCommonDiceCases()	0	10	6

<?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 diceDistance extends 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);
            self::diceDistance($distance, $a, $b, $round);
            return $distance;
        }
        
        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 diceDistance(&$distance, &$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;
        }
    }
}