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<?php
/*
* This file is part of Twig.
*
* (c) 2010 Fabien Potencier
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
class Twig_Extensions_Grammar_Optional extends Twig_Extensions_Grammar
{
protected $grammar;
public function __construct()
{
$this->grammar = array();
foreach (func_get_args() as $grammar) {
$this->addGrammar($grammar);
}
}
public function __toString()
{
$repr = array();
foreach ($this->grammar as $grammar) {
$repr[] = (string) $grammar;
}
return sprintf('[%s]', implode(' ', $repr));
}
public function addGrammar(Twig_Extensions_GrammarInterface $grammar)
{
$this->grammar[] = $grammar;
}
public function parse(Twig_Token $token)
{
// test if we have the optional element before consuming it
if ($this->grammar[0] instanceof Twig_Extensions_Grammar_Constant) {
if (!$this->parser->getStream()->test($this->grammar[0]->getType(), $this->grammar[0]->getName())) {
return array();
}
} elseif ($this->grammar[0] instanceof Twig_Extensions_Grammar_Name) {
if (!$this->parser->getStream()->test(Twig_Token::NAME_TYPE)) {
return array();
}
} elseif ($this->parser->getStream()->test(Twig_Token::BLOCK_END_TYPE)) {
// if this is not a Constant or a Name, it must be the last element of the tag
return array();
}
$elements = array();
foreach ($this->grammar as $grammar) {
$grammar->setParser($this->parser);
$element = $grammar->parse($token);
if (is_array($element)) {
$elements = array_merge($elements, $element);
} else {
$elements[$grammar->getName()] = $element;
}
}
return $elements;
}
}
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