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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\Filter\Template\Tokenizer;
/**
* Template constructions tokenizer
*/
abstract class AbstractTokenizer
{
/**
* Current index in string
*
* @var int
*/
protected $_currentIndex;
/**
* String for tokenize
*
* @var string
*/
protected $_string;
/**
* Move current index to next char.
*
* If index out of bounds returns false
*
* @return boolean
*/
public function next()
{
$stringLength = $this->_string !== null ? strlen($this->_string) : 0;
if ($this->_currentIndex + 1 >= $stringLength) {
return false;
}
$this->_currentIndex++;
return true;
}
/**
* Move current index to previous char.
*
* If index out of bounds returns false
*
* @return boolean
*/
public function prev()
{
if ($this->_currentIndex - 1 < 0) {
return false;
}
$this->_currentIndex--;
return true;
}
/**
* Move current index backwards.
*
* If index out of bounds returns false
*
* @param int $distance number of characters to backtrack
* @return bool
*/
public function back($distance)
{
if ($this->_currentIndex - $distance < 0) {
return false;
}
$this->_currentIndex -= $distance;
return true;
}
/**
* Return current char
*
* @return string
*/
public function char()
{
return $this->_string[$this->_currentIndex];
}
/**
* Set string for tokenize
*
* @param string $value
* @return void
*/
public function setString($value)
{
$this->_string = rawurldecode($value);
$this->reset();
}
/**
* Move char index to begin of string
*
* @return void
*/
public function reset()
{
$this->_currentIndex = 0;
}
/**
* Return true if current char is white-space
*
* @return boolean
*/
public function isWhiteSpace()
{
return $this->_string === '' ?: trim((string)$this->char()) !== $this->char();
}
/**
* Tokenize string
*
* @return array
*/
abstract public function tokenize();
}