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<?php
/*
* This file is part of Mustache.php.
*
* (c) 2012 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* A collection of helpers for a Mustache instance.
*/
class Mustache_HelperCollection
{
private $helpers = array();
/**
* Helper Collection constructor.
*
* Optionally accepts an array (or Traversable) of `$name => $helper` pairs.
*
* @throws InvalidArgumentException if the $helpers argument isn't an array or Traversable
*
* @param array|Traversable $helpers (default: null)
*/
public function __construct($helpers = null)
{
if ($helpers !== null) {
if (!is_array($helpers) && !$helpers instanceof Traversable) {
throw new InvalidArgumentException('HelperCollection constructor expects an array of helpers');
}
foreach ($helpers as $name => $helper) {
$this->add($name, $helper);
}
}
}
/**
* Magic mutator.
*
* @see Mustache_HelperCollection::add
*
* @param string $name
* @param mixed $helper
*/
public function __set($name, $helper)
{
$this->add($name, $helper);
}
/**
* Add a helper to this collection.
*
* @param string $name
* @param mixed $helper
*/
public function add($name, $helper)
{
$this->helpers[$name] = $helper;
}
/**
* Magic accessor.
*
* @see Mustache_HelperCollection::get
*
* @param string $name
*
* @return mixed Helper
*/
public function __get($name)
{
return $this->get($name);
}
/**
* Get a helper by name.
*
* @param string $name
*
* @return mixed Helper
*/
public function get($name)
{
if (!$this->has($name)) {
throw new InvalidArgumentException('Unknown helper: '.$name);
}
return $this->helpers[$name];
}
/**
* Magic isset().
*
* @see Mustache_HelperCollection::has
*
* @param string $name
*
* @return boolean True if helper is present
*/
public function __isset($name)
{
return $this->has($name);
}
/**
* Check whether a given helper is present in the collection.
*
* @param string $name
*
* @return boolean True if helper is present
*/
public function has($name)
{
return array_key_exists($name, $this->helpers);
}
/**
* Magic unset().
*
* @see Mustache_HelperCollection::remove
*
* @param string $name
*/
public function __unset($name)
{
$this->remove($name);
}
/**
* Check whether a given helper is present in the collection.
*
* @throws InvalidArgumentException if the requested helper is not present.
*
* @param string $name
*/
public function remove($name)
{
if (!$this->has($name)) {
throw new InvalidArgumentException('Unknown helper: '.$name);
}
unset($this->helpers[$name]);
}
/**
* Clear the helper collection.
*
* Removes all helpers from this collection
*/
public function clear()
{
$this->helpers = array();
}
/**
* Check whether the helper collection is empty.
*
* @return boolean True if the collection is empty
*/
public function isEmpty()
{
return empty($this->helpers);
}
}
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