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<?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.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
abstract class Twig_Template
{
const ANY_CALL = 'any';
const ARRAY_CALL = 'array';
const METHOD_CALL = 'method';
protected static $cache = array();
protected $parent;
protected $parents = array();
protected $env;
protected $blocks = array();
protected $traits = array();
/**
* Constructor.
*
* @param Twig_Environment $env A Twig_Environment instance
*/
public function __construct(Twig_Environment $env)
{
$this->env = $env;
}
/**
* Returns the template name.
*
* @return string The template name
*/
abstract public function getTemplateName();
/**
* Returns debug information about the template.
*
* @return array Debug information
*
* @internal
*/
abstract public function getDebugInfo();
/**
* Returns information about the original template source code.
*
* @return Twig_Source
*/
public function getSourceContext()
{
return new Twig_Source('', $this->getTemplateName());
}
/**
* Returns the parent template.
*
* This method is for internal use only and should never be called
* directly.
*
* @param array $context
*
* @return Twig_Template|false The parent template or false if there is no parent
*
* @internal
*/
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) {
return $this->parents[$parent->getTemplateName()] = $parent;
}
if (!isset($this->parents[$parent])) {
$this->parents[$parent] = $this->loadTemplate($parent);
}
} catch (Twig_Error_Loader $e) {
$e->setTemplateName(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 $blocks The current set of blocks
*
* @internal
*/
public function displayParentBlock($name, array $context, array $blocks = array())
{
if (isset($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 Twig_Error_Runtime(sprintf('The template has no parent and no traits defining the "%s" block.', $name), -1, $this->getTemplateName());
}
}
/**
* 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 $useBlocks Whether to use the current set of blocks
*
* @internal
*/
public function displayBlock($name, array $context, array $blocks = array(), $useBlocks = true)
{
if ($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;
}
if (null !== $template) {
// avoid RCEs when sandbox is enabled
if (!$template instanceof self) {
throw new LogicException('A block must be a method on a Twig_Template instance.');
}
try {
$template->$block($context, $blocks);
} catch (Twig_Error $e) {
if (!$e->getTemplateName()) {
$e->setTemplateName($template->getTemplateName());
}
// this is mostly useful for Twig_Error_Loader exceptions
// see Twig_Error_Loader
if (false === $e->getTemplateLine()) {
$e->setTemplateLine(-1);
$e->guess();
}
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, $template->getTemplateName(), $e);
}
} elseif (false !== $parent = $this->getParent($context)) {
$parent->displayBlock($name, $context, array_merge($this->blocks, $blocks), false);
}
}
/**
* 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 $blocks The current set of blocks
*
* @return string The rendered block
*
* @internal
*/
public function renderParentBlock($name, array $context, array $blocks = array())
{
ob_start();
$this->displayParentBlock($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 $useBlocks Whether to use the current set of blocks
*
* @return string The rendered block
*
* @internal
*/
public function renderBlock($name, array $context, array $blocks = array(), $useBlocks = true)
{
ob_start();
$this->displayBlock($name, $context, $blocks, $useBlocks);
return ob_get_clean();
}
/**
* Returns whether a block exists or not.
*
* This method is for internal use only and should never be called
* directly.
*
* This method does only return blocks defined in the current template
* or defined in "used" traits.
*
* It does not return blocks from parent templates as the parent
* template name can be dynamic, which is only known based on the
* current context.
*
* @param string $name The block name
*
* @return bool true if the block exists, false otherwise
*
* @internal
*/
public function hasBlock($name)
{
return isset($this->blocks[$name]);
}
/**
* Returns all block names.
*
* This method is for internal use only and should never be called
* directly.
*
* @return array An array of block names
*
* @see hasBlock
*
* @internal
*/
public function getBlockNames()
{
return array_keys($this->blocks);
}
protected function loadTemplate($template, $templateName = null, $line = null, $index = null)
{
try {
if (is_array($template)) {
return $this->env->resolveTemplate($template);
}
if ($template instanceof self) {
return $template;
}
return $this->env->loadTemplate($template, $index);
} catch (Twig_Error $e) {
if (!$e->getTemplateName()) {
$e->setTemplateName($templateName ? $templateName : $this->getTemplateName());
}
if ($e->getTemplateLine()) {
throw $e;
}
if (!$line) {
$e->guess();
} else {
$e->setTemplateLine($line);
}
throw $e;
}
}
/**
* Returns all blocks.
*
* This method is for internal use only and should never be called
* directly.
*
* @return array An array of blocks
*
* @see hasBlock
*
* @internal
*/
public function getBlocks()
{
return $this->blocks;
}
/**
* {@inheritdoc}
*/
public function display(array $context, array $blocks = array())
{
$this->displayWithErrorHandling($this->env->mergeGlobals($context), array_merge($this->blocks, $blocks));
}
/**
* {@inheritdoc}
*/
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;
} catch (Throwable $e) {
while (ob_get_level() > $level) {
ob_end_clean();
}
throw $e;
}
return ob_get_clean();
}
protected function displayWithErrorHandling(array $context, array $blocks = array())
{
try {
$this->doDisplay($context, $blocks);
} catch (Twig_Error $e) {
if (!$e->getTemplateName()) {
$e->setTemplateName($this->getTemplateName());
}
// this is mostly useful for Twig_Error_Loader exceptions
// see Twig_Error_Loader
if (false === $e->getTemplateLine()) {
$e->setTemplateLine(-1);
$e->guess();
}
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, $this->getTemplateName(), $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 $blocks = array());
/**
* Throws an exception for an unknown variable.
*
* This method is for internal use only and should never be called
* directly.
*
* This is an implementation detail due to a PHP limitation before version 7.0.
*
* @return mixed The content of the context variable
*
* @throws Twig_Error_Runtime if the variable does not exist and Twig is running in strict mode
*
* @internal
*/
final protected function notFound($name, $line)
{
throw new Twig_Error_Runtime(sprintf('Variable "%s" does not exist.', $name), $line, $this->getTemplateName());
}
/**
* 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_Template constants)
* @param bool $isDefinedTest Whether this is only a defined check
* @param bool $ignoreStrictCheck Whether to ignore the strict attribute check or not
*
* @return mixed The attribute value, or a Boolean when $isDefinedTest is true, or null when the attribute is not set and $ignoreStrictCheck is true
*
* @throws Twig_Error_Runtime if the attribute does not exist and Twig is running in strict mode and $isDefinedTest is false
*/
protected function getAttribute($object, $item, array $arguments = array(), $type = self::ANY_CALL, $isDefinedTest = false, $ignoreStrictCheck = false)
{
// array
if (self::METHOD_CALL !== $type) {
$arrayItem = is_bool($item) || is_float($item) ? (int) $item : $item;
if ((is_array($object) && array_key_exists($arrayItem, $object))
|| ($object instanceof ArrayAccess && isset($object[$arrayItem]))
) {
if ($isDefinedTest) {
return true;
}
return $object[$arrayItem];
}
if (self::ARRAY_CALL === $type || !is_object($object)) {
if ($isDefinedTest) {
return false;
}
if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
return;
}
if ($object instanceof ArrayAccess) {
$message = sprintf('Key "%s" in object with ArrayAccess of class "%s" does not exist.', $arrayItem, get_class($object));
} elseif (is_object($object)) {
$message = sprintf('Impossible to access a key "%s" on an object of class "%s" that does not implement ArrayAccess interface.', $item, get_class($object));
} elseif (is_array($object)) {
if (empty($object)) {
$message = sprintf('Key "%s" does not exist as the array is empty.', $arrayItem);
} else {
$message = sprintf('Key "%s" for array with keys "%s" does not exist.', $arrayItem, implode(', ', array_keys($object)));
}
} elseif (self::ARRAY_CALL === $type) {
if (null === $object) {
$message = sprintf('Impossible to access a key ("%s") on a null variable.', $item);
} else {
$message = sprintf('Impossible to access a key ("%s") on a %s variable ("%s").', $item, gettype($object), $object);
}
} elseif (null === $object) {
$message = sprintf('Impossible to access an attribute ("%s") on a null variable.', $item);
} else {
$message = sprintf('Impossible to access an attribute ("%s") on a %s variable ("%s").', $item, gettype($object), $object);
}
throw new Twig_Error_Runtime($message, -1, $this->getTemplateName());
}
}
if (!is_object($object)) {
if ($isDefinedTest) {
return false;
}
if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
return;
}
if (null === $object) {
$message = sprintf('Impossible to invoke a method ("%s") on a null variable.', $item);
} else {
$message = sprintf('Impossible to invoke a method ("%s") on a %s variable ("%s").', $item, gettype($object), $object);
}
throw new Twig_Error_Runtime($message, -1, $this->getTemplateName());
}
// object property
if (self::METHOD_CALL !== $type && !$object instanceof self) { // Twig_Template does not have public properties, and we don't want to allow access to internal ones
if (isset($object->$item) || array_key_exists((string) $item, $object)) {
if ($isDefinedTest) {
return true;
}
if ($this->env->hasExtension('Twig_Extension_Sandbox')) {
$this->env->getExtension('Twig_Extension_Sandbox')->checkPropertyAllowed($object, $item);
}
return $object->$item;
}
}
$class = get_class($object);
// object method
if (!isset(self::$cache[$class]['methods'])) {
// get_class_methods returns all methods accessible in the scope, but we only want public ones to be accessible in templates
if ($object instanceof self) {
$ref = new ReflectionClass($class);
$methods = array();
foreach ($ref->getMethods(ReflectionMethod::IS_PUBLIC) as $refMethod) {
$methods[strtolower($refMethod->name)] = true;
}
self::$cache[$class]['methods'] = $methods;
} else {
self::$cache[$class]['methods'] = array_change_key_case(array_flip(get_class_methods($object)));
}
}
$call = false;
$lcItem = strtolower($item);
if (isset(self::$cache[$class]['methods'][$lcItem])) {
$method = (string) $item;
} elseif (isset(self::$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']['has'.$lcItem])) {
$method = 'has'.$item;
} elseif (isset(self::$cache[$class]['methods']['__call'])) {
$method = (string) $item;
$call = true;
} else {
if ($isDefinedTest) {
return false;
}
if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
return;
}
throw new Twig_Error_Runtime(sprintf('Neither the property "%1$s" nor one of the methods "%1$s()", "get%1$s()"/"is%1$s()" or "__call()" exist and have public access in class "%2$s".', $item, get_class($object)), -1, $this->getTemplateName());
}
if ($isDefinedTest) {
return true;
}
if ($this->env->hasExtension('Twig_Extension_Sandbox')) {
$this->env->getExtension('Twig_Extension_Sandbox')->checkMethodAllowed($object, $method);
}
// Some objects throw exceptions when they have __call, and the method we try
// to call is not supported. If ignoreStrictCheck is true, we should return null.
try {
$ret = call_user_func_array(array($object, $method), $arguments);
} catch (BadMethodCallException $e) {
if ($call && ($ignoreStrictCheck || !$this->env->isStrictVariables())) {
return;
}
throw $e;
}
// useful when calling a template method from a template
// this is not supported but unfortunately heavily used in the Symfony profiler
if ($object instanceof self) {
return $ret === '' ? '' : new Twig_Markup($ret, $this->env->getCharset());
}
return $ret;
}
}