RepeatControllerGroups.php
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<?php
/**
* PHPTAL templating engine
*
* PHP Version 5
*
* @category HTML
* @package PHPTAL
* @author Laurent Bedubourg <lbedubourg@motion-twin.com>
* @author Kornel Lesiński <kornel@aardvarkmedia.co.uk>
* @author Iván Montes <drslump@pollinimini.net>
* @license http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License
* @version SVN: $Id: RepeatControllerGroups.php 657 2009-06-30 16:48:20Z kornel $
* @link http://phptal.org/
*/
/**
* Keeps track of variable contents when using grouping in a path (first/ and last/)
*
* @package PHPTAL
* @subpackage Php
*/
class PHPTAL_RepeatControllerGroups
{
protected $dict = array();
protected $cache = array();
protected $data = null;
protected $vars = array();
protected $branch;
public function __construct()
{
$this->dict = array();
$this->reset();
}
/**
* Resets the result caches. Use it to signal an iteration in the loop
*
*/
public function reset()
{
$this->cache = array();
}
/**
* Checks if the data passed is the first one in a group
*
* @param mixed $data The data to evaluate
* @return Mixed True if the first item in the group, false if not and
* this same object if the path is not finished
*/
public function first($data)
{
if ( !is_array($data) && !is_object($data) && !is_null($data) ) {
if ( !isset($this->cache['F']) ) {
$hash = md5($data);
if ( !isset($this->dict['F']) || $this->dict['F'] !== $hash ) {
$this->dict['F'] = $hash;
$res = true;
} else {
$res = false;
}
$this->cache['F'] = $res;
}
return $this->cache['F'];
}
$this->data = $data;
$this->branch = 'F';
$this->vars = array();
return $this;
}
/**
* Checks if the data passed is the last one in a group
*
* @param mixed $data The data to evaluate
* @return Mixed True if the last item in the group, false if not and
* this same object if the path is not finished
*/
public function last($data)
{
if ( !is_array($data) && !is_object($data) && !is_null($data) ) {
if ( !isset($this->cache['L']) ) {
$hash = md5($data);
if (empty($this->dict['L'])) {
$this->dict['L'] = $hash;
$res = false;
} elseif ($this->dict['L'] !== $hash) {
$this->dict['L'] = $hash;
$res = true;
} else {
$res = false;
}
$this->cache['L'] = $res;
}
return $this->cache['L'];
}
$this->data = $data;
$this->branch = 'L';
$this->vars = array();
return $this;
}
/**
* Handles variable accesses for the tal path resolver
*
* @param string $var The variable name to check
* @return Mixed An object/array if the path is not over or a boolean
*
* @todo replace the PHPTAL_Context::path() with custom code
*/
public function __get($var)
{
// When the iterator item is empty we just let the tal
// expression consume by continuously returning this
// same object which should evaluate to true for 'last'
if ( is_null($this->data) ) {
return $this;
}
// Find the requested variable
$value = PHPTAL_Context::path($this->data, $var, true);
// Check if it's an object or an array
if ( is_array($value) || is_object($value) ) {
// Move the context to the requested variable and return
$this->data = $value;
$this->addVarName($var);
return $this;
}
// get a hash of the variable contents
$hash = md5($value);
// compute a path for the variable to use as dictionary key
$path = $this->branch . $this->getVarPath() . $var;
// If we don't know about this var store in the dictionary
if ( !isset($this->cache[$path]) ) {
if ( !isset($this->dict[$path]) ) {
$this->dict[$path] = $hash;
$res = $this->branch === 'F';
} else {
// Check if the value has changed
if ($this->dict[$path] !== $hash) {
$this->dict[$path] = $hash;
$res = true;
} else {
$res = false;
}
}
$this->cache[$path] = $res;
}
return $this->cache[$path];
}
/**
* Adds a variable name to the current path of variables
*
* @param string $varname The variable name to store as a path part
* @access protected
*/
protected function addVarName($varname)
{
$this->vars[] = $varname;
}
/**
* Returns the current variable path separated by a slash
*
* @return String The current variable path
* @access protected
*/
protected function getVarPath()
{
return implode('/', $this->vars) . '/';
}
}
?>