Verzeichnisstruktur phpBB-3.1.0
- Veröffentlicht
- 27.10.2014
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For.php
001 <?php
002
003 /*
004 * This file is part of Twig.
005 *
006 * (c) 2009 Fabien Potencier
007 * (c) 2009 Armin Ronacher
008 *
009 * For the full copyright and license information, please view the LICENSE
010 * file that was distributed with this source code.
011 */
012
013 /**
014 * Loops over each item of a sequence.
015 *
016 * <pre>
017 * <ul>
018 * {% for user in users %}
019 * <li>{{ user.username|e }}</li>
020 * {% endfor %}
021 * </ul>
022 * </pre>
023 */
024 class Twig_TokenParser_For extends Twig_TokenParser
025 {
026 /**
027 * Parses a token and returns a node.
028 *
029 * @param Twig_Token $token A Twig_Token instance
030 *
031 * @return Twig_NodeInterface A Twig_NodeInterface instance
032 */
033 public function parse(Twig_Token $token)
034 {
035 $lineno = $token->getLine();
036 $stream = $this->parser->getStream();
037 $targets = $this->parser->getExpressionParser()->parseAssignmentExpression();
038 $stream->expect(Twig_Token::OPERATOR_TYPE, 'in');
039 $seq = $this->parser->getExpressionParser()->parseExpression();
040
041 $ifexpr = null;
042 if ($stream->test(Twig_Token::NAME_TYPE, 'if')) {
043 $stream->next();
044 $ifexpr = $this->parser->getExpressionParser()->parseExpression();
045 }
046
047 $stream->expect(Twig_Token::BLOCK_END_TYPE);
048 $body = $this->parser->subparse(array($this, 'decideForFork'));
049 if ($stream->next()->getValue() == 'else') {
050 $stream->expect(Twig_Token::BLOCK_END_TYPE);
051 $else = $this->parser->subparse(array($this, 'decideForEnd'), true);
052 } else {
053 $else = null;
054 }
055 $stream->expect(Twig_Token::BLOCK_END_TYPE);
056
057 if (count($targets) > 1) {
058 $keyTarget = $targets->getNode(0);
059 $keyTarget = new Twig_Node_Expression_AssignName($keyTarget->getAttribute('name'), $keyTarget->getLine());
060 $valueTarget = $targets->getNode(1);
061 $valueTarget = new Twig_Node_Expression_AssignName($valueTarget->getAttribute('name'), $valueTarget->getLine());
062 } else {
063 $keyTarget = new Twig_Node_Expression_AssignName('_key', $lineno);
064 $valueTarget = $targets->getNode(0);
065 $valueTarget = new Twig_Node_Expression_AssignName($valueTarget->getAttribute('name'), $valueTarget->getLine());
066 }
067
068 if ($ifexpr) {
069 $this->checkLoopUsageCondition($stream, $ifexpr);
070 $this->checkLoopUsageBody($stream, $body);
071 }
072
073 return new Twig_Node_For($keyTarget, $valueTarget, $seq, $ifexpr, $body, $else, $lineno, $this->getTag());
074 }
075
076 public function decideForFork(Twig_Token $token)
077 {
078 return $token->test(array('else', 'endfor'));
079 }
080
081 public function decideForEnd(Twig_Token $token)
082 {
083 return $token->test('endfor');
084 }
085
086 // the loop variable cannot be used in the condition
087 protected function checkLoopUsageCondition(Twig_TokenStream $stream, Twig_NodeInterface $node)
088 {
089 if ($node instanceof Twig_Node_Expression_GetAttr && $node->getNode('node') instanceof Twig_Node_Expression_Name && 'loop' == $node->getNode('node')->getAttribute('name')) {
090 throw new Twig_Error_Syntax('The "loop" variable cannot be used in a looping condition', $node->getLine(), $stream->getFilename());
091 }
092
093 foreach ($node as $n) {
094 if (!$n) {
095 continue;
096 }
097
098 $this->checkLoopUsageCondition($stream, $n);
099 }
100 }
101
102 // check usage of non-defined loop-items
103 // it does not catch all problems (for instance when a for is included into another or when the variable is used in an include)
104 protected function checkLoopUsageBody(Twig_TokenStream $stream, Twig_NodeInterface $node)
105 {
106 if ($node instanceof Twig_Node_Expression_GetAttr && $node->getNode('node') instanceof Twig_Node_Expression_Name && 'loop' == $node->getNode('node')->getAttribute('name')) {
107 $attribute = $node->getNode('attribute');
108 if ($attribute instanceof Twig_Node_Expression_Constant && in_array($attribute->getAttribute('value'), array('length', 'revindex0', 'revindex', 'last'))) {
109 throw new Twig_Error_Syntax(sprintf('The "loop.%s" variable is not defined when looping with a condition', $attribute->getAttribute('value')), $node->getLine(), $stream->getFilename());
110 }
111 }
112
113 // should check for parent.loop.XXX usage
114 if ($node instanceof Twig_Node_For) {
115 return;
116 }
117
118 foreach ($node as $n) {
119 if (!$n) {
120 continue;
121 }
122
123 $this->checkLoopUsageBody($stream, $n);
124 }
125 }
126
127 /**
128 * Gets the tag name associated with this token parser.
129 *
130 * @return string The tag name
131 */
132 public function getTag()
133 {
134 return 'for';
135 }
136 }
137