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1 | <?php |
2 | ||
3 | /* | |
4 | * This file is part of Twig. | |
5 | * | |
6 | * (c) 2010 Fabien Potencier | |
7 | * | |
8 | * For the full copyright and license information, please view the LICENSE | |
9 | * file that was distributed with this source code. | |
10 | */ | |
11 | class Twig_Extensions_Grammar_Optional extends Twig_Extensions_Grammar | |
12 | { | |
13 | protected $grammar; | |
14 | ||
15 | public function __construct() | |
16 | { | |
17 | $this->grammar = array(); | |
18 | foreach (func_get_args() as $grammar) { | |
19 | $this->addGrammar($grammar); | |
20 | } | |
21 | } | |
22 | ||
23 | public function __toString() | |
24 | { | |
25 | $repr = array(); | |
26 | foreach ($this->grammar as $grammar) { | |
27 | $repr[] = (string) $grammar; | |
28 | } | |
29 | ||
30 | return sprintf('[%s]', implode(' ', $repr)); | |
31 | } | |
32 | ||
33 | public function addGrammar(Twig_Extensions_GrammarInterface $grammar) | |
34 | { | |
35 | $this->grammar[] = $grammar; | |
36 | } | |
37 | ||
38 | public function parse(Twig_Token $token) | |
39 | { | |
40 | // test if we have the optional element before consuming it | |
41 | if ($this->grammar[0] instanceof Twig_Extensions_Grammar_Constant) { | |
42 | if (!$this->parser->getStream()->test($this->grammar[0]->getType(), $this->grammar[0]->getName())) { | |
43 | return array(); | |
44 | } | |
45 | } elseif ($this->grammar[0] instanceof Twig_Extensions_Grammar_Name) { | |
46 | if (!$this->parser->getStream()->test(Twig_Token::NAME_TYPE)) { | |
47 | return array(); | |
48 | } | |
49 | } elseif ($this->parser->getStream()->test(Twig_Token::BLOCK_END_TYPE)) { | |
50 | // if this is not a Constant or a Name, it must be the last element of the tag | |
51 | ||
52 | return array(); | |
53 | } | |
54 | ||
55 | $elements = array(); | |
56 | foreach ($this->grammar as $grammar) { | |
57 | $grammar->setParser($this->parser); | |
58 | ||
59 | $element = $grammar->parse($token); | |
60 | if (is_array($element)) { | |
61 | $elements = array_merge($elements, $element); | |
62 | } else { | |
63 | $elements[$grammar->getName()] = $element; | |
64 | } | |
65 | } | |
66 | ||
67 | return $elements; | |
68 | } | |
69 | } |