lainchan/inc/contrib/Twig/Template.php

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2011-10-05 00:22:53 -04:00
<?php
/*
* This file is part of Twig.
*
* (c) 2009 Fabien Potencier
* (c) 2009 Armin Ronacher
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* Default base class for compiled templates.
*
* @package twig
* @author Fabien Potencier <fabien@symfony.com>
*/
abstract class Twig_Template implements Twig_TemplateInterface
{
static protected $cache = array();
protected $parents;
protected $env;
protected $blocks;
/**
* Constructor.
*
* @param Twig_Environment $env A Twig_Environment instance
*/
public function __construct(Twig_Environment $env)
{
$this->env = $env;
$this->blocks = array();
}
/**
* Returns the template name.
*
* @return string The template name
*/
abstract public function getTemplateName();
/**
* Returns the Twig environment.
*
* @return Twig_Environment The Twig environment
*/
public function getEnvironment()
{
return $this->env;
}
/**
* Returns the parent template.
*
* @return Twig_TemplateInterface|false The parent template or false if there is no parent
*/
public function getParent(array $context)
{
$parent = $this->doGetParent($context);
if (false === $parent) {
return false;
} elseif ($parent instanceof Twig_Template) {
$name = $parent->getTemplateName();
$this->parents[$name] = $parent;
$parent = $name;
} elseif (!isset($this->parents[$parent])) {
$this->parents[$parent] = $this->env->loadTemplate($parent);
}
return $this->parents[$parent];
}
abstract protected function doGetParent(array $context);
/**
* Displays a parent block.
*
* @param string $name The block name to display from the parent
* @param array $context The context
* @param array $blocks The current set of blocks
*/
public function displayParentBlock($name, array $context, array $blocks = array())
{
if (false !== $parent = $this->getParent($context)) {
$parent->displayBlock($name, $context, $blocks);
} else {
throw new Twig_Error_Runtime('This template has no parent', -1, $this->getTemplateName());
}
}
/**
* Displays a block.
*
* @param string $name The block name to display
* @param array $context The context
* @param array $blocks The current set of blocks
*/
public function displayBlock($name, array $context, array $blocks = array())
{
if (isset($blocks[$name])) {
$b = $blocks;
unset($b[$name]);
call_user_func($blocks[$name], $context, $b);
} elseif (isset($this->blocks[$name])) {
call_user_func($this->blocks[$name], $context, $blocks);
} elseif (false !== $parent = $this->getParent($context)) {
$parent->displayBlock($name, $context, array_merge($this->blocks, $blocks));
}
}
/**
* Renders a parent block.
*
* @param string $name The block name to render from the parent
* @param array $context The context
* @param array $blocks The current set of blocks
*
* @return string The rendered block
*/
public function renderParentBlock($name, array $context, array $blocks = array())
{
ob_start();
$this->displayParentBlock($name, $context, $blocks);
return ob_get_clean();
}
/**
* Renders a block.
*
* @param string $name The block name to render
* @param array $context The context
* @param array $blocks The current set of blocks
*
* @return string The rendered block
*/
public function renderBlock($name, array $context, array $blocks = array())
{
ob_start();
$this->displayBlock($name, $context, $blocks);
return ob_get_clean();
}
/**
* Returns whether a block exists or not.
*
* @param string $name The block name
*
* @return Boolean true if the block exists, false otherwise
*/
public function hasBlock($name)
{
return isset($this->blocks[$name]);
}
/**
* Returns all block names.
*
* @return array An array of block names
*/
public function getBlockNames()
{
return array_keys($this->blocks);
}
/**
* Returns all blocks.
*
* @return array An array of blocks
*/
public function getBlocks()
{
return $this->blocks;
}
/**
* Displays the template with the given context.
*
* @param array $context An array of parameters to pass to the template
* @param array $blocks An array of blocks to pass to the template
*/
public function display(array $context, array $blocks = array())
{
try {
$this->doDisplay($context, $blocks);
} catch (Twig_Error $e) {
throw $e;
} catch (Exception $e) {
throw new Twig_Error_Runtime(sprintf('An exception has been thrown during the rendering of a template ("%s").', $e->getMessage()), -1, null, $e);
}
}
/**
* Renders the template with the given context and returns it as string.
*
* @param array $context An array of parameters to pass to the template
*
* @return string The rendered template
*/
public function render(array $context)
{
$level = ob_get_level();
ob_start();
try {
$this->display($context);
} catch (Exception $e) {
while (ob_get_level() > $level) {
ob_end_clean();
}
throw $e;
}
return ob_get_clean();
}
/**
* Auto-generated method to display the template with the given context.
*
* @param array $context An array of parameters to pass to the template
* @param array $blocks An array of blocks to pass to the template
*/
abstract protected function doDisplay(array $context, array $blocks = array());
/**
* Returns a variable from the context.
*
* @param array $context The context
* @param string $item The variable to return from the context
*
* @return The content of the context variable
*
* @throws Twig_Error_Runtime if the variable does not exist and Twig is running in strict mode
*/
protected function getContext($context, $item)
{
if (!array_key_exists($item, $context)) {
if (!$this->env->isStrictVariables()) {
return null;
}
throw new Twig_Error_Runtime(sprintf('Variable "%s" does not exist', $item));
}
return $context[$item];
}
/**
* Returns the attribute value for a given array/object.
*
* @param mixed $object The object or array from where to get the item
* @param mixed $item The item to get from the array or object
* @param array $arguments An array of arguments to pass if the item is an object method
* @param string $type The type of attribute (@see Twig_TemplateInterface)
* @param Boolean $isDefinedTest Whether this is only a defined check
*/
protected function getAttribute($object, $item, array $arguments = array(), $type = Twig_TemplateInterface::ANY_CALL, $isDefinedTest = false)
{
// array
if (Twig_TemplateInterface::METHOD_CALL !== $type) {
if ((is_array($object) && array_key_exists($item, $object))
|| ($object instanceof ArrayAccess && isset($object[$item]))
) {
if ($isDefinedTest) {
return true;
}
return $object[$item];
}
if (Twig_TemplateInterface::ARRAY_CALL === $type) {
if ($isDefinedTest) {
return false;
}
if (!$this->env->isStrictVariables()) {
return null;
}
if (is_object($object)) {
throw new Twig_Error_Runtime(sprintf('Key "%s" in object (with ArrayAccess) of type "%s" does not exist', $item, get_class($object)));
// array
} else {
throw new Twig_Error_Runtime(sprintf('Key "%s" for array with keys "%s" does not exist', $item, implode(', ', array_keys($object))));
}
}
}
if (!is_object($object)) {
if ($isDefinedTest) {
return false;
}
if (!$this->env->isStrictVariables()) {
return null;
}
throw new Twig_Error_Runtime(sprintf('Item "%s" for "%s" does not exist', $item, $object));
}
// get some information about the object
$class = get_class($object);
if (!isset(self::$cache[$class])) {
$r = new ReflectionClass($class);
self::$cache[$class] = array('methods' => array(), 'properties' => array());
foreach ($r->getMethods(ReflectionMethod::IS_PUBLIC) as $method) {
self::$cache[$class]['methods'][strtolower($method->getName())] = true;
}
foreach ($r->getProperties(ReflectionProperty::IS_PUBLIC) as $property) {
self::$cache[$class]['properties'][$property->getName()] = true;
}
}
// object property
if (Twig_TemplateInterface::METHOD_CALL !== $type) {
if (isset(self::$cache[$class]['properties'][$item])
|| isset($object->$item) || array_key_exists($item, $object)
) {
if ($isDefinedTest) {
return true;
}
if ($this->env->hasExtension('sandbox')) {
$this->env->getExtension('sandbox')->checkPropertyAllowed($object, $item);
}
return $object->$item;
}
}
// object method
$lcItem = strtolower($item);
if (isset(self::$cache[$class]['methods'][$lcItem])) {
$method = $item;
} elseif (isset(self::$cache[$class]['methods']['get'.$lcItem])) {
$method = 'get'.$item;
} elseif (isset(self::$cache[$class]['methods']['is'.$lcItem])) {
$method = 'is'.$item;
} elseif (isset(self::$cache[$class]['methods']['__call'])) {
$method = $item;
} else {
if ($isDefinedTest) {
return false;
}
if (!$this->env->isStrictVariables()) {
return null;
}
throw new Twig_Error_Runtime(sprintf('Method "%s" for object "%s" does not exist', $item, get_class($object)));
}
if ($isDefinedTest) {
return true;
}
if ($this->env->hasExtension('sandbox')) {
$this->env->getExtension('sandbox')->checkMethodAllowed($object, $method);
}
$ret = call_user_func_array(array($object, $method), $arguments);
if ($object instanceof Twig_TemplateInterface) {
return new Twig_Markup($ret);
}
return $ret;
}
}