Copy.php

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<?php

namespace cogpowered\FineDiff\Parser\Operations;

class Copy implements OperationInterface
{
    public function __construct($len)
    {
        $this->len = $len;
    }

    public function getFromLen()
    {
        return $this->len;
    }

    public function getToLen()
    {
        return $this->len;
    }

    public function getOpcode()
    {
        if ($this->len === 1) {
            return 'c';
        }

        return "c{$this->len}";
    }

    public function increase($size)
    {
        return $this->len += $size;
    }
}