Graze\CiffRenderer\BarcodeGenerator\BarcodeGeneratorEan13

Complexity

Total Complexity

6

Size/Duplication

Total Lines	94
Duplicated Lines	0 %

Test Coverage

Coverage

100%

Importance

Changes	1
Bugs	0	Features	0

2 Methods

Rating	Name	Duplication	Size	Complexity
A	generate()	0	20	4
A	convertToFontCode()	0	62	2

<?php

namespace Graze\CiffRenderer\BarcodeGenerator;

use Graze\CiffRenderer\BarcodeGenerator\BarcodeGeneratorInterface;
use Graze\CiffRenderer\BarcodeGenerator\BarcodeType;
use Graze\CiffRenderer\BarcodeGenerator\BarcodeGeneratorEan13;

class BarcodeGeneratorEan13 implements BarcodeGeneratorInterface
{
    /**
     * @param string $data
     * @return string
     */
    public function generate($data)
    {
        // add up each digit in the barcode - odd digits counting
        // from the right are tripled before being added
        $sum = 0;
        $triple = true;
        for ($i = strlen($data)-1; $i >= 0; $i--) {
            $sum += ($triple ? 3 : 1) * $data[$i];
            $triple = !$triple;

The condition $triple is always true.

        }

        //check digit is the inverse remainder after / by 10
        //e.g. 4 becomes 6, 8 becomes 2 etc...
        $remainder = $sum % 10;

        if ($remainder > 0) {
            $remainder = 10 - $remainder;
        }

        return $this->convertToFontCode($data . $remainder);
    }

    /**
    * @param string $barcode
    * @return string
    */
    private function convertToFontCode($barcode)
    {
        /**
        * The barcode is split into the following sections:
        *  First digit
        *  First group of 6 digits (2nd-7th)
        *  Last group of 6 digits (8th-13th)
        *      e.g.        1234567890128
        *      becomes     1   234567  890128
        *
        * The font converts the first digit to a char between q-z
        *
        * The first group of digits are converted to chars starting at either A or Q,
        * the first digit affects the format of the first group as follows:
        *  1st digit     First group format
        *      0           AAAAAA
        *      1           AAQAQQ
        *      2           AAQQAQ
        *      3           AAQQQA
        *      4           AQAAQQ
        *      5           AQQAAQ
        *      6           AQQQAA
        *      7           AQAQAQ
        *      8           AQAQQA
        *      9           AQQAQA
        *
        * The last group of digits remain unchanged
        *
        * The actual format used by the font is:
        *       firstDigit  {{{{{|  firstGroup  {|{  secondGroup  |
        */

        // convert first digit
        $firstDigit = (int)substr($barcode, 0, 1);
        $firstDigitChar = chr(113 + $firstDigit);

        // convert first group
        $firstGroup = '';
        $firstGroupFormats = [
            'AAAAAA',
            'AAQAQQ',
            'AAQQAQ',
            'AAQQQA',
            'AQAAQQ',
            'AQQAAQ',
            'AQQQAA',
            'AQAQAQ',
            'AQAQQA',
            'AQQAQA'
        ];
        $firstGroupFormat = $firstGroupFormats[$firstDigit];
        for ($i = 1; $i <= 6; $i++) {
            $digit = (int)substr($barcode, $i, 1);
            $startingChar = substr($firstGroupFormat, $i - 1, 1);
            $firstGroup .= chr(ord($startingChar) + $digit);
        }

        // extract second group
        $secondGroup = substr($barcode, 7);

        // combine the barcode with the special chars used by the font
        return $firstDigitChar.'{{{{{|'.$firstGroup.'{|{'.$secondGroup.'|';
    }
}