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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.
*/
/**
* Abstract Mustache Template class.
*
* @abstract
*/
abstract class Mustache_Template
{
/**
* @var Mustache_Engine
*/
protected $mustache;
/**
* Mustache Template constructor.
*
* @param Mustache_Engine $mustache
*/
public function __construct(Mustache_Engine $mustache)
{
$this->mustache = $mustache;
}
/**
* Mustache Template instances can be treated as a function and rendered by simply calling them:
*
* $m = new Mustache_Engine;
* $tpl = $m->loadTemplate('Hello, {{ name }}!');
* echo $tpl(array('name' => 'World')); // "Hello, World!"
*
* @see Mustache_Template::render
*
* @param mixed $context Array or object rendering context (default: array())
*
* @return string Rendered template
*/
public function __invoke($context = array())
{
return $this->render($context);
}
/**
* Render this template given the rendering context.
*
* @param mixed $context Array or object rendering context (default: array())
*
* @return string Rendered template
*/
public function render($context = array())
{
return $this->renderInternal($this->prepareContextStack($context));
}
/**
* Internal rendering method implemented by Mustache Template concrete subclasses.
*
* This is where the magic happens :)
*
* @param Mustache_Context $context
* @param string $indent (default: '')
* @param bool $escape (default: false)
*
* @return string Rendered template
*/
abstract public function renderInternal(Mustache_Context $context, $indent = '', $escape = false);
/**
* Tests whether a value should be iterated over (e.g. in a section context).
*
* In most languages there are two distinct array types: list and hash (or whatever you want to call them). Lists
* should be iterated, hashes should be treated as objects. Mustache follows this paradigm for Ruby, Javascript,
* Java, Python, etc.
*
* PHP, however, treats lists and hashes as one primitive type: array. So Mustache.php needs a way to distinguish
* between between a list of things (numeric, normalized array) and a set of variables to be used as section context
* (associative array). In other words, this will be iterated over:
*
* $items = array(
* array('name' => 'foo'),
* array('name' => 'bar'),
* array('name' => 'baz'),
* );
*
* ... but this will be used as a section context block:
*
* $items = array(
* 1 => array('name' => 'foo'),
* 'banana' => array('name' => 'bar'),
* 42 => array('name' => 'baz'),
* );
*
* @param mixed $value
*
* @return boolean True if the value is 'iterable'
*/
protected function isIterable($value)
{
if (is_object($value)) {
return $value instanceof Traversable;
} elseif (is_array($value)) {
$i = 0;
foreach ($value as $k => $v) {
if ($k !== $i++) {
return false;
}
}
return true;
} else {
return false;
}
}
/**
* Helper method to prepare the Context stack.
*
* Adds the Mustache HelperCollection to the stack's top context frame if helpers are present.
*
* @param mixed $context Optional first context frame (default: null)
*
* @return Mustache_Context
*/
protected function prepareContextStack($context = null)
{
$stack = new Mustache_Context;
$helpers = $this->mustache->getHelpers();
if (!$helpers->isEmpty()) {
$stack->push($helpers);
}
if (!empty($context)) {
$stack->push($context);
}
return $stack;
}
}
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