File "Template.php"
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<?php
/*
* This file is part of Twig.
*
* (c) Fabien Potencier
* (c) Armin Ronacher
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Twig;
use Twig\Error\Error;
use Twig\Error\LoaderError;
use Twig\Error\RuntimeError;
/**
* Default base class for compiled templates.
*
* This class is an implementation detail of how template compilation currently
* works, which might change. It should never be used directly. Use $twig->load()
* instead, which returns an instance of \Twig\TemplateWrapper.
*
* @author Fabien Potencier <fabien@symfony.com>
*
* @internal
*/
abstract class Template
{
public const ANY_CALL = 'any';
public const ARRAY_CALL = 'array';
public const METHOD_CALL = 'method';
protected $parent;
protected $parents = [];
protected $env;
protected $blocks = [];
protected $traits = [];
protected $extensions = [];
protected $sandbox;
public function __construct(Environment $env)
{
$this->env = $env;
$this->extensions = $env->getExtensions();
}
/**
* Returns the template name.
*
* @return string The template name
*/
abstract public function getTemplateName();
/**
* Returns debug information about the template.
*
* @return array Debug information
*/
abstract public function getDebugInfo();
/**
* Returns information about the original template source code.
*
* @return Source
*/
abstract public function getSourceContext();
/**
* Returns the parent template.
*
* This method is for internal use only and should never be called
* directly.
*
* @return Template|TemplateWrapper|false The parent template or false if there is no parent
*/
public function getParent(array $context)
{
if (null !== $this->parent) {
return $this->parent;
}
try {
$parent = $this->doGetParent($context);
if (false === $parent) {
return false;
}
if ($parent instanceof self || $parent instanceof TemplateWrapper) {
return $this->parents[$parent->getSourceContext()->getName()] = $parent;
}
if (!isset($this->parents[$parent])) {
$this->parents[$parent] = $this->loadTemplate($parent);
}
} catch (LoaderError $e) {
$e->setSourceContext(null);
$e->guess();
throw $e;
}
return $this->parents[$parent];
}
protected function doGetParent(array $context)
{
return false;
}
public function isTraitable()
{
return true;
}
/**
* Displays a parent block.
*
* This method is for internal use only and should never be called
* directly.
*
* @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 $blocks = [])
{
if (isset($this->traits[$name])) {
$this->traits[$name][0]->displayBlock($name, $context, $blocks, false);
} elseif (false !== $parent = $this->getParent($context)) {
$parent->displayBlock($name, $context, $blocks, false);
} else {
throw new RuntimeError(sprintf('The template has no parent and no traits defining the "%s" block.', $name), -1, $this->getSourceContext());
}
}
/**
* Displays a block.
*
* This method is for internal use only and should never be called
* directly.
*
* @param string $name The block name to display
* @param array $context The context
* @param array $blocks The current set of blocks
* @param bool $useBlocks Whether to use the current set of blocks
*/
public function displayBlock($name, array $context, array $blocks = [], $useBlocks = true, self $templateContext = null)
{
if ($useBlocks && isset($blocks[$name])) {
$template = $blocks[$name][0];
$block = $blocks[$name][1];
} elseif (isset($this->blocks[$name])) {
$template = $this->blocks[$name][0];
$block = $this->blocks[$name][1];
} else {
$template = null;
$block = null;
}
// avoid RCEs when sandbox is enabled
if (null !== $template && !$template instanceof self) {
throw new \LogicException('A block must be a method on a \Twig\Template instance.');
}
if (null !== $template) {
try {
$template->$block($context, $blocks);
} catch (Error $e) {
if (!$e->getSourceContext()) {
$e->setSourceContext($template->getSourceContext());
}
// this is mostly useful for \Twig\Error\LoaderError exceptions
// see \Twig\Error\LoaderError
if (-1 === $e->getTemplateLine()) {
$e->guess();
}
throw $e;
} catch (\Exception $e) {
$e = new RuntimeError(sprintf('An exception has been thrown during the rendering of a template ("%s").', $e->getMessage()), -1, $template->getSourceContext(), $e);
$e->guess();
throw $e;
}
} elseif (false !== $parent = $this->getParent($context)) {
$parent->displayBlock($name, $context, array_merge($this->blocks, $blocks), false, $templateContext ?? $this);
} elseif (isset($blocks[$name])) {
throw new RuntimeError(sprintf('Block "%s" should not call parent() in "%s" as the block does not exist in the parent template "%s".', $name, $blocks[$name][0]->getTemplateName(), $this->getTemplateName()), -1, $blocks[$name][0]->getSourceContext());
} else {
throw new RuntimeError(sprintf('Block "%s" on template "%s" does not exist.', $name, $this->getTemplateName()), -1, ($templateContext ?? $this)->getSourceContext());
}
}
/**
* Renders a parent block.
*
* This method is for internal use only and should never be called
* directly.
*
* @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 $blocks = [])
{
if ($this->env->isDebug()) {
ob_start();
} else {
ob_start(function () { return ''; });
}
$this->displayParentBlock($name, $context, $blocks);
return ob_get_clean();
}
/**
* Renders a block.
*
* This method is for internal use only and should never be called
* directly.
*
* @param string $name The block name to render
* @param array $context The context
* @param array $blocks The current set of blocks
* @param bool $useBlocks Whether to use the current set of blocks
*
* @return string The rendered block
*/
public function renderBlock($name, array $context, array $blocks = [], $useBlocks = true)
{
if ($this->env->isDebug()) {
ob_start();
} else {
ob_start(function () { return ''; });
}
$this->displayBlock($name, $context, $blocks, $useBlocks);
return ob_get_clean();
}
/**
* Returns whether a block exists or not in the current context of the template.
*
* This method checks blocks defined in the current template
* or defined in "used" traits or defined in parent templates.
*
* @param string $name The block name
* @param array $context The context
* @param array $blocks The current set of blocks
*
* @return bool true if the block exists, false otherwise
*/
public function hasBlock($name, array $context, array $blocks = [])
{
if (isset($blocks[$name])) {
return $blocks[$name][0] instanceof self;
}
if (isset($this->blocks[$name])) {
return true;
}
if (false !== $parent = $this->getParent($context)) {
return $parent->hasBlock($name, $context);
}
return false;
}
/**
* Returns all block names in the current context of the template.
*
* This method checks blocks defined in the current template
* or defined in "used" traits or defined in parent templates.
*
* @param array $context The context
* @param array $blocks The current set of blocks
*
* @return array An array of block names
*/
public function getBlockNames(array $context, array $blocks = [])
{
$names = array_merge(array_keys($blocks), array_keys($this->blocks));
if (false !== $parent = $this->getParent($context)) {
$names = array_merge($names, $parent->getBlockNames($context));
}
return array_unique($names);
}
/**
* @return Template|TemplateWrapper
*/
protected function loadTemplate($template, $templateName = null, $line = null, $index = null)
{
try {
if (\is_array($template)) {
return $this->env->resolveTemplate($template);
}
if ($template instanceof self || $template instanceof TemplateWrapper) {
return $template;
}
if ($template === $this->getTemplateName()) {
$class = static::class;
if (false !== $pos = strrpos($class, '___', -1)) {
$class = substr($class, 0, $pos);
}
} else {
$class = $this->env->getTemplateClass($template);
}
return $this->env->loadTemplate($class, $template, $index);
} catch (Error $e) {
if (!$e->getSourceContext()) {
$e->setSourceContext($templateName ? new Source('', $templateName) : $this->getSourceContext());
}
if ($e->getTemplateLine() > 0) {
throw $e;
}
if (!$line) {
$e->guess();
} else {
$e->setTemplateLine($line);
}
throw $e;
}
}
/**
* @internal
*
* @return Template
*/
public function unwrap()
{
return $this;
}
/**
* Returns all blocks.
*
* This method is for internal use only and should never be called
* directly.
*
* @return array An array of blocks
*/
public function getBlocks()
{
return $this->blocks;
}
public function display(array $context, array $blocks = [])
{
$this->displayWithErrorHandling($this->env->mergeGlobals($context), array_merge($this->blocks, $blocks));
}
public function render(array $context)
{
$level = ob_get_level();
if ($this->env->isDebug()) {
ob_start();
} else {
ob_start(function () { return ''; });
}
try {
$this->display($context);
} catch (\Throwable $e) {
while (ob_get_level() > $level) {
ob_end_clean();
}
throw $e;
}
return ob_get_clean();
}
protected function displayWithErrorHandling(array $context, array $blocks = [])
{
try {
$this->doDisplay($context, $blocks);
} catch (Error $e) {
if (!$e->getSourceContext()) {
$e->setSourceContext($this->getSourceContext());
}
// this is mostly useful for \Twig\Error\LoaderError exceptions
// see \Twig\Error\LoaderError
if (-1 === $e->getTemplateLine()) {
$e->guess();
}
throw $e;
} catch (\Exception $e) {
$e = new RuntimeError(sprintf('An exception has been thrown during the rendering of a template ("%s").', $e->getMessage()), -1, $this->getSourceContext(), $e);
$e->guess();
throw $e;
}
}
/**
* 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 = []);
}