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Completed
Pull Request — master (#1087)
by Henrique
11:00 queued 08:15
created

Luhn::isLuhn()   A

↳ Parent: Luhn

Complexity

Conditions 4
Paths 4

Size

Total Lines 17
Code Lines 11

Duplication

Lines 0
Ratio 0 %

Code Coverage

Tests 12
CRAP Score 4

Importance

Changes 0
Metric Value
cc 4
eloc 11
nc 4
nop 1
dl 0
loc 17
ccs 12
cts 12
cp 1
crap 4
rs 9.9
c 0
b 0
f 0
1 
<?php
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/*

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * This file is part of Respect/Validation.

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 *

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * (c) Alexandre Gomes Gaigalas <[email protected]>

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 *

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * For the full copyright and license information, please view the "LICENSE.md"

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * file that was distributed with this source code.

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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declare(strict_types=1);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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namespace Respect\Validation\Rules;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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/**

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * @see https://en.wikipedia.org/wiki/Luhn_algorithm

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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class Luhn extends AbstractRule

            


            
                                                                                                            
                            
            
                                    
            
            

                
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{

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    /**

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * {@inheritdoc}

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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                             10                         
                
                
                
    public function isValid($input): bool

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        if (!(new Digit())->isValid($input)) {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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            return false;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        return $this->isLuhn($input);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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    private function isLuhn($input): bool

            


            
                                                                        
                            
            
                                    
            
            

                
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    {

            


            
                                                                        
                            
            
                                    
            
            

                
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        $sum = 0;

            


            
                                                                        
                            
            
                                    
            
            

                
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        $numDigits = mb_strlen($input);

            


            
                                                                        
                            
            
                                    
            
            

                
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        $parity = $numDigits % 2;

            


            
                                                                        
                            
            
                                    
            
            

                
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        for ($i = 0; $i < $numDigits; ++$i) {

            


            
                                                                        
                            
            
                                    
            
            

                
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            $digit = mb_substr($input, $i, 1);

            


            
                                                                        
                            
            
                                    
            
            

                
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            if ($parity == ($i % 2)) {

            


            
                                                                        
                            
            
                                    
            
            

                
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                $digit <<= 1;

            


            
                                                                        
                            
            
                                    
            
            

                
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                if (9 < $digit) {

            


            
                                                                        
                            
            
                                    
            
            

                
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                    $digit = $digit - 9;

            


            
                                                                        
                            
            
                                    
            
            

                
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                }

            


            
                                                                        
                            
            
                                    
            
            

                
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            }

            


            
                                                                        
                            
            
                                    
            
            

                
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            $sum += $digit;

            


            
                                                                        
                            
            
                                    
            
            

                
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        }

            


            
                                                                        
                            
            
                                    
            
            

                
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        return 0 == ($sum % 10);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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}

            


            
                                                        
            
                                    
            
            

                
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