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<?php
class PlaceHoldersStorage
{
private $_storage;
private $_index;
private $_stack = array();
private $_openBracket;
private $_closeBracket;
public $parent;
/**
* @param null $placeholders
* @param string $openBracket
* @param string $closeBracket
*/
public function __construct($placeholders = null, $openBracket = '{', $closeBracket = '}')
{
$this->_openBracket = $openBracket;
$this->_closeBracket = $closeBracket;
if (!isset($placeholders)) {
$this->parent = null;
$this->_storage = array();
} else if (is_callable($placeholders) || (is_object($placeholders)
&& 'PlaceHoldersStorage' === get_class($placeholders)
&& method_exists($placeholders,'get'))) {
$this->parent = $placeholders;
$this->_storage = array();
} else {
$this->parent = null;
$this->_storage = $placeholders;
}
$this->_index = 1;
}
/**
* @param $method
* @param $args
* @return mixed
*/
public function __call($method, $args)
{
if ( $this->{$method} instanceof Closure ) {
return call_user_func_array($this->{$method},$args);
}
}
/**
* @param $value
* @return string
*/
public function create($value)
{
$key = 'var' . $this->_index;
$this->_index += 1;
$this->set($key, $value);
return $this->_openBracket . $key . $this->_closeBracket;
}
/**
* @param $key
* @param string $value
*/
public function set($key, $value = '')
{
if (is_array($key)) {
foreach ($key as $k => $v){
$this->set($k, $v);
}
return;
}
if ($this->_validate($key)) {
$this->_storage[$key] = $value;
} else {
trigger_error('The "' . $key . '" placeholder is not added to' +
' the collection because of unsupported name.', E_USER_ERROR);
}
}
/**
* @param $key
* @return string
*/
public function get($key)
{
if (array_key_exists($key, $this->_storage)) {
$value = $this->_storage[$key];
} else {
$value = (null === $this->parent) ? '' :
(is_callable($this->parent) ? $this->parent($key) : $this->parent->get($key));
}
return $value;
}
/**
* @param $key
*/
public function remove($key)
{
if (isset($this->_storage[$key])) {
unset($this->_storage[$key]);
}
}
/**
* @return null
*/
public function getStorage()
{
return $this->_storage;
}
/**
* @param $text
* @return mixed
*/
public function replace($text)
{
return $this->replacer($text);
}
/**
* @param $text
* @return mixed
*/
public function replacer($text)
{
$openBracket = preg_quote($this->_openBracket);
$closeBracket = preg_quote($this->_closeBracket);
return preg_replace_callback("/$openBracket([a-z0-9_]+)$closeBracket/i", array(&$this, '_processContent'), $text);
}
/**
* @param $matches
* @return mixed
* @throws Exception
*/
private function _processContent($matches)
{
$key = $matches[1];
if (in_array($key, $this->_stack)) {
throw new Exception('Circular reference in placeholder values.');
}
array_push($this->_stack, $key);
$result = $this->replacer($this->get($key));
array_pop($this->_stack);
return '' !== $result ? $result : $matches[0];
}
/**
* @param $name
* @return mixed
*/
private function _validate($name)
{
return preg_match('/^[\w\d_\-]+$/', $name);
}
}