139 lines
4.0 KiB
PHP
139 lines
4.0 KiB
PHP
<?php
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/**
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* @package Grav.Common.Twig
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*
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* @copyright Copyright (C) 2015 - 2018 Trilby Media, LLC. All rights reserved.
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* @license MIT License; see LICENSE file for details.
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* @origin https://gist.github.com/maxgalbu/9409182
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*/
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namespace Grav\Common\Twig\TokenParser;
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use Grav\Common\Twig\Node\TwigNodeSwitch;
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/**
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* Adds ability use elegant switch instead of ungainly if statements
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*
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* {% switch type %}
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* {% case 'foo' %}
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* {{ my_data.foo }}
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* {% case 'bar' %}
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* {{ my_data.bar }}
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* {% default %}
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* {{ my_data.default }}
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* {% endswitch %}
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*/
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class TwigTokenParserSwitch extends \Twig_TokenParser
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{
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/**
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* {@inheritdoc}
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*/
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public function parse(\Twig_Token $token)
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{
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$lineno = $token->getLine();
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$stream = $this->parser->getStream();
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$name = $this->parser->getExpressionParser()->parseExpression();
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$stream->expect(\Twig_Token::BLOCK_END_TYPE);
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// There can be some whitespace between the {% switch %} and first {% case %} tag.
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while ($stream->getCurrent()->getType() == \Twig_Token::TEXT_TYPE && trim($stream->getCurrent()->getValue()) == '')
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{
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$stream->next();
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}
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$stream->expect(\Twig_Token::BLOCK_START_TYPE);
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$expressionParser = $this->parser->getExpressionParser();
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$default = null;
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$cases = array();
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$end = false;
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while (!$end)
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{
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$next = $stream->next();
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switch ($next->getValue())
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{
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case 'case':
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{
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$values = array();
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while (true)
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{
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$values[] = $expressionParser->parsePrimaryExpression();
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// Multiple allowed values?
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if ($stream->test(\Twig_Token::OPERATOR_TYPE, 'or'))
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{
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$stream->next();
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}
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else
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{
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break;
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}
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}
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$stream->expect(\Twig_Token::BLOCK_END_TYPE);
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$body = $this->parser->subparse(array($this, 'decideIfFork'));
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$cases[] = new \Twig_Node(array(
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'values' => new \Twig_Node($values),
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'body' => $body
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));
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break;
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}
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case 'default':
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{
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$stream->expect(\Twig_Token::BLOCK_END_TYPE);
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$default = $this->parser->subparse(array($this, 'decideIfEnd'));
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break;
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}
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case 'endswitch':
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{
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$end = true;
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break;
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}
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default:
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{
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throw new \Twig_Error_Syntax(sprintf('Unexpected end of template. Twig was looking for the following tags "case", "default", or "endswitch" to close the "switch" block started at line %d)', $lineno), -1);
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}
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}
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}
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$stream->expect(\Twig_Token::BLOCK_END_TYPE);
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return new TwigNodeSwitch($name, new \Twig_Node($cases), $default, $lineno, $this->getTag());
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}
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/**
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* Decide if current token marks switch logic.
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*
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* @param \Twig_Token $token
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* @return bool
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*/
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public function decideIfFork(\Twig_Token $token)
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{
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return $token->test(array('case', 'default', 'endswitch'));
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}
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/**
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* Decide if current token marks end of swtich block.
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*
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* @param \Twig_Token $token
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* @return bool
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*/
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public function decideIfEnd(\Twig_Token $token)
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{
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return $token->test(array('endswitch'));
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}
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/**
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* {@inheritdoc}
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*/
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public function getTag()
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{
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return 'switch';
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}
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}
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