AbstractTokenizer.php

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<?php
namespace Magento\Framework\Filter\Template\Tokenizer;

abstract class AbstractTokenizer
{
    protected $_currentIndex;

    protected $_string;

    public function next()
    {
        if ($this->_currentIndex + 1 >= strlen($this->_string)) {
            return false;
        }

        $this->_currentIndex++;
        return true;
    }

    public function prev()
    {
        if ($this->_currentIndex - 1 < 0) {
            return false;
        }

        $this->_currentIndex--;
        return true;
    }

    public function back($distance)
    {
        if ($this->_currentIndex - $distance < 0) {
            return false;
        }

        $this->_currentIndex -= $distance;
        return true;
    }

    public function char()
    {
        return $this->_string[$this->_currentIndex];
    }

    public function setString($value)
    {
        $this->_string = urldecode($value);
        $this->reset();
    }

    public function reset()
    {
        $this->_currentIndex = 0;
    }

    public function isWhiteSpace()
    {
        return trim($this->char()) != $this->char();
    }

    abstract public function tokenize();
}