<?php namespace System\Twig;

use Twig\Node\BlockNode;
use Twig\Node\Expression\BlockReferenceExpression;
use Twig\Node\Expression\ConstantExpression;
use Twig\Node\PrintNode;
use Twig\Token;
use Twig\TokenParser\AbstractTokenParser;

/**
 * Filters a section of a template by applying filters.
 *
 *   {% filter upper %}
 *      This text becomes uppercase
 *   {% endfilter %}
 *
 * @deprecated since Twig 2.9, to be removed in 3.0 (use the "apply" tag instead)
 */
final class FilterTokenParser extends AbstractTokenParser
{
    public function parse(Token $token)
    {
        @trigger_error('The "filter" tag is deprecated since Twig 2.9, use the "apply" tag instead.', E_USER_DEPRECATED);

        $name = $this->parser->getVarName();
        $ref = new BlockReferenceExpression(new ConstantExpression($name, $token->getLine()), null, $token->getLine(), $this->getTag());

        $filter = $this->parser->getExpressionParser()->parseFilterExpressionRaw($ref, $this->getTag());
        $this->parser->getStream()->expect(/* Token::BLOCK_END_TYPE */ 3);

        $body = $this->parser->subparse([$this, 'decideBlockEnd'], true);
        $this->parser->getStream()->expect(/* Token::BLOCK_END_TYPE */ 3);

        $block = new BlockNode($name, $body, $token->getLine());
        $this->parser->setBlock($name, $block);

        return new PrintNode($filter, $token->getLine(), $this->getTag());
    }

    public function decideBlockEnd(Token $token)
    {
        return $token->test('endfilter');
    }

    public function getTag()
    {
        return 'filter';
    }
}
