smarty_internal_resource_extends.php
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	<?php
	/**
	* Smarty Internal Plugin Resource Extends
	*
	* @package Smarty
	* @subpackage TemplateResources
	* @author Uwe Tews
	* @author Rodney Rehm
	*/

	/**
	* Smarty Internal Plugin Resource Extends
	*
	* Implements the file system as resource for Smarty which {extend}s a chain of template files templates
	*
	* @package Smarty
	* @subpackage TemplateResources
	*/
	class Smarty_Internal_Resource_Extends extends Smarty_Resource
	{
	/**
	* mbstring.overload flag
	*
	* @var int
	*/
	public $mbstring_overload = 0;

	/**
	* populate Source Object with meta data from Resource
	*
	* @param Smarty_Template_Source $source source object
	* @param Smarty_Internal_Template $_template template object
	*/
	public function populate(Smarty_Template_Source $source, Smarty_Internal_Template $_template = null)
	{
	$uid = '';
	$sources = array();
	$components = explode('\|', $source->name);
	$exists = true;
	foreach ($components as $component) {
	$s = Smarty_Resource::source(null, $source->smarty, $component);
	if ($s->type == 'php') {
	throw new SmartyException("Resource type {$s->type} cannot be used with the extends resource type");
	}
	$sources[$s->uid] = $s;
	$uid .= $s->filepath;
	if ($_template && $_template->smarty->compile_check) {
	$exists = $exists && $s->exists;
	}
	}
	$source->components = $sources;
	$source->filepath = $s->filepath;
	$source->uid = sha1($uid);
	if ($_template && $_template->smarty->compile_check) {
	$source->timestamp = $s->timestamp;
	$source->exists = $exists;
	}
	// need the template at getContent()
	$source->template = $_template;
	}

	/**
	* populate Source Object with timestamp and exists from Resource
	*
	* @param Smarty_Template_Source $source source object
	*/
	public function populateTimestamp(Smarty_Template_Source $source)
	{
	$source->exists = true;
	foreach ($source->components as $s) {
	$source->exists = $source->exists && $s->exists;
	}
	$source->timestamp = $s->timestamp;
	}

	/**
	* Load template's source from files into current template object
	*
	* @param Smarty_Template_Source $source source object
	* @return string template source
	* @throws SmartyException if source cannot be loaded
	*/
	public function getContent(Smarty_Template_Source $source)
	{
	if (!$source->exists) {
	throw new SmartyException("Unable to read template {$source->type} '{$source->name}'");
	}

	$_components = array_reverse($source->components);

	$_content = '';
	foreach ($_components as $_component) {
	// read content
	$_content .= $_component->content;
	}
	return $_content;
	}

	/**
	* Determine basename for compiled filename
	*
	* @param Smarty_Template_Source $source source object
	* @return string resource's basename
	*/
	public function getBasename(Smarty_Template_Source $source)
	{
	return str_replace(':', '.', basename($source->filepath));
	}

	}

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