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