70 lines
2.0 KiB
PHP
70 lines
2.0 KiB
PHP
|
<?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;
|
||
|
|
}
|
||
|
|
}
|