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