Template.php

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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.
 */

abstract class Twig_Template implements Twig_TemplateInterface
{
    protected static $cache = array();

    protected $parent;
    protected $parents;
    protected $env;
    protected $blocks;
    protected $traits;

    public function __construct(Twig_Environment $env)
    {
        $this->env = $env;
        $this->blocks = array();
        $this->traits = array();
    }

    abstract public function getTemplateName();

    public function getEnvironment()
    {
        return $this->env;
    }

    public function getParent(array $context)
    {
        if (null !== $this->parent) {
            return $this->parent;
        }

        $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];
    }

    protected function doGetParent(array $context)
    {
        return false;
    }

    public function isTraitable()
    {
        return true;
    }

    public function displayParentBlock($name, array $context, array $blocks = array())
    {
        $name = (string) $name;

        if (isset($this->traits[$name])) {
            $this->traits[$name][0]->displayBlock($name, $context, $blocks);
        } elseif (false !== $parent = $this->getParent($context)) {
            $parent->displayBlock($name, $context, $blocks);
        } else {
            throw new Twig_Error_Runtime(sprintf('The template has no parent and no traits defining the "%s" block', $name), -1, $this->getTemplateName());
        }
    }

    public function displayBlock($name, array $context, array $blocks = array())
    {
        $name = (string) $name;

        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));
        }
    }

    public function renderParentBlock($name, array $context, array $blocks = array())
    {
        ob_start();
        $this->displayParentBlock($name, $context, $blocks);

        return ob_get_clean();
    }

    public function renderBlock($name, array $context, array $blocks = array())
    {
        ob_start();
        $this->displayBlock($name, $context, $blocks);

        return ob_get_clean();
    }

    public function hasBlock($name)
    {
        return isset($this->blocks[(string) $name]);
    }

    public function getBlockNames()
    {
        return array_keys($this->blocks);
    }

    public function getBlocks()
    {
        return $this->blocks;
    }

    public function display(array $context, array $blocks = array())
    {
        $this->displayWithErrorHandling($this->env->mergeGlobals($context), $blocks);
    }

    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();
    }

    protected function displayWithErrorHandling(array $context, array $blocks = array())
    {
        try {
            $this->doDisplay($context, $blocks);
        } catch (Twig_Error $e) {
            if (!$e->getTemplateFile()) {
                $e->setTemplateFile($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, null, $e);
        }
    }

    abstract protected function doDisplay(array $context, array $blocks = array());

    final protected function getContext($context, $item, $ignoreStrictCheck = false)
    {
        if (!array_key_exists($item, $context)) {
            if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
                return null;
            }

            throw new Twig_Error_Runtime(sprintf('Variable "%s" does not exist', $item), -1, $this->getTemplateName());
        }

        return $context[$item];
    }

    protected function getAttribute($object, $item, array $arguments = array(), $type = Twig_TemplateInterface::ANY_CALL, $isDefinedTest = false, $ignoreStrictCheck = false)
    {
        // array
        if (Twig_TemplateInterface::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 (Twig_TemplateInterface::ARRAY_CALL === $type || !is_object($object)) {
                if ($isDefinedTest) {
                    return false;
                }

                if ($ignoreStrictCheck || !$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', $arrayItem, get_class($object)), -1, $this->getTemplateName());
                } elseif (is_array($object)) {
                    throw new Twig_Error_Runtime(sprintf('Key "%s" for array with keys "%s" does not exist', $arrayItem, implode(', ', array_keys($object))), -1, $this->getTemplateName());
                } elseif (Twig_TemplateInterface::ARRAY_CALL === $type) {
                    throw new Twig_Error_Runtime(sprintf('Impossible to access a key ("%s") on a %s variable ("%s")', $item, gettype($object), $object), -1, $this->getTemplateName());
                } else {
                    throw new Twig_Error_Runtime(sprintf('Impossible to access an attribute ("%s") on a %s variable ("%s")', $item, gettype($object), $object), -1, $this->getTemplateName());
                }
            }
        }

        if (!is_object($object)) {
            if ($isDefinedTest) {
                return false;
            }

            if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
                return null;
            }

            throw new Twig_Error_Runtime(sprintf('Impossible to invoke a method ("%s") on a %s variable ("%s")', $item, gettype($object), $object), -1, $this->getTemplateName());
        }

        $class = get_class($object);

        // object property
        if (Twig_TemplateInterface::METHOD_CALL !== $type) {
            if (isset($object->$item) || array_key_exists((string) $item, $object)) {
                if ($isDefinedTest) {
                    return true;
                }

                if ($this->env->hasExtension('sandbox')) {
                    $this->env->getExtension('sandbox')->checkPropertyAllowed($object, $item);
                }

                return $object->$item;
            }
        }

        // object method
        if (!isset(self::$cache[$class]['methods'])) {
            self::$cache[$class]['methods'] = array_change_key_case(array_flip(get_class_methods($object)));
        }

        $lcItem = strtolower($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']['__call'])) {
            $method = (string) $item;
        } else {
            if ($isDefinedTest) {
                return false;
            }

            if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
                return null;
            }

            throw new Twig_Error_Runtime(sprintf('Method "%s" for object "%s" does not exist', $item, get_class($object)), -1, $this->getTemplateName());
        }

        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);

        // useful when calling a template method from a template
        // this is not supported but unfortunately heavily used in the Symfony profiler
        if ($object instanceof Twig_TemplateInterface) {
            return $ret === '' ? '' : new Twig_Markup($ret, $this->env->getCharset());
        }

        return $ret;
    }

    public static function clearCache()
    {
        self::$cache = array();
    }
}