456 lines
14 KiB
PHP
456 lines
14 KiB
PHP
<?php
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/*
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* This file is part of Twig.
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*
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* (c) 2009 Fabien Potencier
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* (c) 2009 Armin Ronacher
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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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* Default base class for compiled templates.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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abstract class Twig_Template implements Twig_TemplateInterface
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{
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protected static $cache = array();
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protected $parent;
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protected $parents;
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protected $env;
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protected $blocks;
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protected $traits;
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/**
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* Constructor.
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*
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* @param Twig_Environment $env A Twig_Environment instance
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*/
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public function __construct(Twig_Environment $env)
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{
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$this->env = $env;
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$this->blocks = array();
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$this->traits = array();
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}
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/**
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* Returns the template name.
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*
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* @return string The template name
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*/
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abstract public function getTemplateName();
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/**
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* {@inheritdoc}
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*/
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public function getEnvironment()
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{
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return $this->env;
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}
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/**
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* Returns the parent template.
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*
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* This method is for internal use only and should never be called
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* directly.
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*
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* @return Twig_TemplateInterface|false The parent template or false if there is no parent
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*/
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public function getParent(array $context)
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{
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if (null !== $this->parent) {
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return $this->parent;
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}
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$parent = $this->doGetParent($context);
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if (false === $parent) {
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return false;
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} elseif ($parent instanceof Twig_Template) {
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$name = $parent->getTemplateName();
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$this->parents[$name] = $parent;
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$parent = $name;
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} elseif (!isset($this->parents[$parent])) {
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$this->parents[$parent] = $this->env->loadTemplate($parent);
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}
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return $this->parents[$parent];
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}
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protected function doGetParent(array $context)
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{
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return false;
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}
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public function isTraitable()
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{
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return true;
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}
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/**
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* Displays a parent block.
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*
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* This method is for internal use only and should never be called
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* directly.
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*
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* @param string $name The block name to display from the parent
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* @param array $context The context
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* @param array $blocks The current set of blocks
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*/
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public function displayParentBlock($name, array $context, array $blocks = array())
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{
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$name = (string) $name;
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if (isset($this->traits[$name])) {
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$this->traits[$name][0]->displayBlock($name, $context, $blocks);
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} elseif (false !== $parent = $this->getParent($context)) {
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$parent->displayBlock($name, $context, $blocks);
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} else {
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throw new Twig_Error_Runtime(sprintf('The template has no parent and no traits defining the "%s" block', $name), -1, $this->getTemplateName());
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}
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}
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/**
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* Displays a block.
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*
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* This method is for internal use only and should never be called
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* directly.
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*
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* @param string $name The block name to display
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* @param array $context The context
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* @param array $blocks The current set of blocks
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*/
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public function displayBlock($name, array $context, array $blocks = array())
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{
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$name = (string) $name;
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if (isset($blocks[$name])) {
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$b = $blocks;
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unset($b[$name]);
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call_user_func($blocks[$name], $context, $b);
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} elseif (isset($this->blocks[$name])) {
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call_user_func($this->blocks[$name], $context, $blocks);
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} elseif (false !== $parent = $this->getParent($context)) {
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$parent->displayBlock($name, $context, array_merge($this->blocks, $blocks));
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}
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}
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/**
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* Renders a parent block.
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*
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* This method is for internal use only and should never be called
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* directly.
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*
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* @param string $name The block name to render from the parent
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* @param array $context The context
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* @param array $blocks The current set of blocks
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*
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* @return string The rendered block
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*/
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public function renderParentBlock($name, array $context, array $blocks = array())
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{
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ob_start();
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$this->displayParentBlock($name, $context, $blocks);
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return ob_get_clean();
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}
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/**
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* Renders a block.
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*
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* This method is for internal use only and should never be called
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* directly.
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*
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* @param string $name The block name to render
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* @param array $context The context
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* @param array $blocks The current set of blocks
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*
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* @return string The rendered block
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*/
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public function renderBlock($name, array $context, array $blocks = array())
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{
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ob_start();
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$this->displayBlock($name, $context, $blocks);
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return ob_get_clean();
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}
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/**
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* Returns whether a block exists or not.
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*
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* This method is for internal use only and should never be called
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* directly.
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*
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* This method does only return blocks defined in the current template
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* or defined in "used" traits.
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*
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* It does not return blocks from parent templates as the parent
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* template name can be dynamic, which is only known based on the
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* current context.
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*
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* @param string $name The block name
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*
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* @return Boolean true if the block exists, false otherwise
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*/
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public function hasBlock($name)
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{
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return isset($this->blocks[(string) $name]);
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}
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/**
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* Returns all block names.
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*
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* This method is for internal use only and should never be called
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* directly.
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*
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* @return array An array of block names
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*
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* @see hasBlock
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*/
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public function getBlockNames()
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{
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return array_keys($this->blocks);
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}
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/**
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* Returns all blocks.
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*
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* This method is for internal use only and should never be called
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* directly.
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*
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* @return array An array of blocks
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*
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* @see hasBlock
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*/
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public function getBlocks()
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{
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return $this->blocks;
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}
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/**
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* {@inheritdoc}
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*/
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public function display(array $context, array $blocks = array())
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{
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$this->displayWithErrorHandling($this->env->mergeGlobals($context), $blocks);
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}
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/**
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* {@inheritdoc}
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*/
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public function render(array $context)
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{
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$level = ob_get_level();
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ob_start();
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try {
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$this->display($context);
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} catch (Exception $e) {
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while (ob_get_level() > $level) {
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ob_end_clean();
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}
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throw $e;
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}
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return ob_get_clean();
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}
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protected function displayWithErrorHandling(array $context, array $blocks = array())
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{
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try {
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$this->doDisplay($context, $blocks);
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} catch (Twig_Error $e) {
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if (!$e->getTemplateFile()) {
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$e->setTemplateFile($this->getTemplateName());
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}
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// this is mostly useful for Twig_Error_Loader exceptions
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// see Twig_Error_Loader
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if (false === $e->getTemplateLine()) {
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$e->setTemplateLine(-1);
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$e->guess();
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}
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throw $e;
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} catch (Exception $e) {
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throw new Twig_Error_Runtime(sprintf('An exception has been thrown during the rendering of a template ("%s").', $e->getMessage()), -1, null, $e);
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}
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}
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/**
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* Auto-generated method to display the template with the given context.
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*
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* @param array $context An array of parameters to pass to the template
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* @param array $blocks An array of blocks to pass to the template
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*/
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abstract protected function doDisplay(array $context, array $blocks = array());
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/**
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* Returns a variable from the context.
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*
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* This method is for internal use only and should never be called
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* directly.
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*
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* This method should not be overridden in a sub-class as this is an
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* implementation detail that has been introduced to optimize variable
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* access for versions of PHP before 5.4. This is not a way to override
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* the way to get a variable value.
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*
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* @param array $context The context
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* @param string $item The variable to return from the context
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* @param Boolean $ignoreStrictCheck Whether to ignore the strict variable check or not
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*
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* @return The content of the context variable
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*
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* @throws Twig_Error_Runtime if the variable does not exist and Twig is running in strict mode
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*/
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final protected function getContext($context, $item, $ignoreStrictCheck = false)
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{
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if (!array_key_exists($item, $context)) {
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if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
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return null;
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}
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throw new Twig_Error_Runtime(sprintf('Variable "%s" does not exist', $item), -1, $this->getTemplateName());
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}
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return $context[$item];
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}
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/**
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* Returns the attribute value for a given array/object.
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*
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* @param mixed $object The object or array from where to get the item
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* @param mixed $item The item to get from the array or object
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* @param array $arguments An array of arguments to pass if the item is an object method
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* @param string $type The type of attribute (@see Twig_TemplateInterface)
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* @param Boolean $isDefinedTest Whether this is only a defined check
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* @param Boolean $ignoreStrictCheck Whether to ignore the strict attribute check or not
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*
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* @return mixed The attribute value, or a Boolean when $isDefinedTest is true, or null when the attribute is not set and $ignoreStrictCheck is true
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*
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* @throws Twig_Error_Runtime if the attribute does not exist and Twig is running in strict mode and $isDefinedTest is false
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*/
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protected function getAttribute($object, $item, array $arguments = array(), $type = Twig_TemplateInterface::ANY_CALL, $isDefinedTest = false, $ignoreStrictCheck = false)
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{
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// array
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if (Twig_TemplateInterface::METHOD_CALL !== $type) {
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$arrayItem = is_bool($item) || is_float($item) ? (int) $item : $item;
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if ((is_array($object) && array_key_exists($arrayItem, $object))
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|| ($object instanceof ArrayAccess && isset($object[$arrayItem]))
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) {
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if ($isDefinedTest) {
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return true;
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}
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return $object[$arrayItem];
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}
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if (Twig_TemplateInterface::ARRAY_CALL === $type || !is_object($object)) {
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if ($isDefinedTest) {
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return false;
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}
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if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
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return null;
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}
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if (is_object($object)) {
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throw new Twig_Error_Runtime(sprintf('Key "%s" in object (with ArrayAccess) of type "%s" does not exist', $arrayItem, get_class($object)), -1, $this->getTemplateName());
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} elseif (is_array($object)) {
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throw new Twig_Error_Runtime(sprintf('Key "%s" for array with keys "%s" does not exist', $arrayItem, implode(', ', array_keys($object))), -1, $this->getTemplateName());
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} elseif (Twig_TemplateInterface::ARRAY_CALL === $type) {
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throw new Twig_Error_Runtime(sprintf('Impossible to access a key ("%s") on a %s variable ("%s")', $item, gettype($object), $object), -1, $this->getTemplateName());
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} else {
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throw new Twig_Error_Runtime(sprintf('Impossible to access an attribute ("%s") on a %s variable ("%s")', $item, gettype($object), $object), -1, $this->getTemplateName());
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}
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}
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}
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if (!is_object($object)) {
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if ($isDefinedTest) {
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return false;
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}
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if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
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return null;
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}
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throw new Twig_Error_Runtime(sprintf('Impossible to invoke a method ("%s") on a %s variable ("%s")', $item, gettype($object), $object), -1, $this->getTemplateName());
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}
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$class = get_class($object);
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// object property
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if (Twig_TemplateInterface::METHOD_CALL !== $type) {
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if (isset($object->$item) || array_key_exists((string) $item, $object)) {
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if ($isDefinedTest) {
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return true;
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}
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if ($this->env->hasExtension('sandbox')) {
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$this->env->getExtension('sandbox')->checkPropertyAllowed($object, $item);
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}
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return $object->$item;
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}
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}
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// object method
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if (!isset(self::$cache[$class]['methods'])) {
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self::$cache[$class]['methods'] = array_change_key_case(array_flip(get_class_methods($object)));
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}
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$lcItem = strtolower($item);
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if (isset(self::$cache[$class]['methods'][$lcItem])) {
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$method = (string) $item;
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} elseif (isset(self::$cache[$class]['methods']['get'.$lcItem])) {
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$method = 'get'.$item;
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} elseif (isset(self::$cache[$class]['methods']['is'.$lcItem])) {
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$method = 'is'.$item;
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} elseif (isset(self::$cache[$class]['methods']['__call'])) {
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$method = (string) $item;
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} else {
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if ($isDefinedTest) {
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return false;
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}
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if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
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return null;
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}
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throw new Twig_Error_Runtime(sprintf('Method "%s" for object "%s" does not exist', $item, get_class($object)), -1, $this->getTemplateName());
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}
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if ($isDefinedTest) {
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return true;
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}
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if ($this->env->hasExtension('sandbox')) {
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$this->env->getExtension('sandbox')->checkMethodAllowed($object, $method);
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}
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$ret = call_user_func_array(array($object, $method), $arguments);
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// useful when calling a template method from a template
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// this is not supported but unfortunately heavily used in the Symfony profiler
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if ($object instanceof Twig_TemplateInterface) {
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return $ret === '' ? '' : new Twig_Markup($ret, $this->env->getCharset());
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}
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return $ret;
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}
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/**
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* This method is only useful when testing Twig. Do not use it.
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*/
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public static function clearCache()
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{
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self::$cache = array();
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}
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}
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