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<?php
/*
 * Spring Signage Ltd - http://www.springsignage.com
 * Copyright (C) 2015 Spring Signage Ltd
 * (TransTokenParser.php)
 */

namespace Xibo\Twig;

class TransTokenParser extends \Twig_TokenParser
{
    /**
     * Parses a token and returns a node.
     *
     * @param \Twig_Token $token A Twig_Token instance
     *
     * @return TransNode A Twig_Node instance
     */
    public function parse(\Twig_Token $token)
    {
        $lineno = $token->getLine();
        $stream = $this->parser->getStream();
        $count = null;
        $plural = null;
        $notes = null;

if (!$stream->test(\Twig_Token::BLOCK_END_TYPE)) {
            $body = $this->parser->getExpressionParser()->parseExpression();
        } else {
            $stream->expect(\Twig_Token::BLOCK_END_TYPE);
            $body = $this->parser->subparse(array($this, 'decideForFork'));
            $next = $stream->next()->getValue();

if ('plural' === $next) {
                $count = $this->parser->getExpressionParser()->parseExpression();
                $stream->expect(\Twig_Token::BLOCK_END_TYPE);
                $plural = $this->parser->subparse(array($this, 'decideForFork'));

if ('notes' === $stream->next()->getValue()) {
                    $stream->expect(\Twig_Token::BLOCK_END_TYPE);
                    $notes = $this->parser->subparse(array($this, 'decideForEnd'), true);
                }
            } elseif ('notes' === $next) {
                $stream->expect(\Twig_Token::BLOCK_END_TYPE);
                $notes = $this->parser->subparse(array($this, 'decideForEnd'), true);
            }
        }

$stream->expect(\Twig_Token::BLOCK_END_TYPE);

$this->checkTransString($body, $lineno);

return new TransNode($body, $plural, $count, $notes, $lineno, $this->getTag());
    }

public function decideForFork(\Twig_Token $token)
    {
        return $token->test(array('plural', 'notes', 'endtrans'));
    }

public function decideForEnd(\Twig_Token $token)
    {
        return $token->test('endtrans');
    }

/**
     * Gets the tag name associated with this token parser.
     *
     * @param string The tag name
     *
     * @return string
     */
    public function getTag()
    {
        return 'trans';
    }

protected function checkTransString(\Twig_Node $body, $lineno)
    {
        foreach ($body as $i => $node) {
            if (
                $node instanceof \Twig_Node_Text
                ||
                ($node instanceof \Twig_Node_Print && $node->getNode('expr') instanceof \Twig_Node_Expression_Name)
            ) {
                continue;
            }

throw new \Twig_Error_Syntax(sprintf('The text to be translated with "trans" can only contain references to simple variables'), $lineno);
        }
    }
}