Matthias Andreas Benkard | 12a5735 | 2021-12-28 18:02:04 +0100 | [diff] [blame^] | 1 | <?php |
| 2 | |
| 3 | /* |
| 4 | * This file is part of Twig. |
| 5 | * |
| 6 | * (c) Fabien Potencier |
| 7 | * (c) Armin Ronacher |
| 8 | * |
| 9 | * For the full copyright and license information, please view the LICENSE |
| 10 | * file that was distributed with this source code. |
| 11 | */ |
| 12 | |
| 13 | namespace Twig\TokenParser; |
| 14 | |
| 15 | use Twig\Error\SyntaxError; |
| 16 | use Twig\Node\IfNode; |
| 17 | use Twig\Node\Node; |
| 18 | use Twig\Token; |
| 19 | |
| 20 | /** |
| 21 | * Tests a condition. |
| 22 | * |
| 23 | * {% if users %} |
| 24 | * <ul> |
| 25 | * {% for user in users %} |
| 26 | * <li>{{ user.username|e }}</li> |
| 27 | * {% endfor %} |
| 28 | * </ul> |
| 29 | * {% endif %} |
| 30 | * |
| 31 | * @internal |
| 32 | */ |
| 33 | final class IfTokenParser extends AbstractTokenParser |
| 34 | { |
| 35 | public function parse(Token $token): Node |
| 36 | { |
| 37 | $lineno = $token->getLine(); |
| 38 | $expr = $this->parser->getExpressionParser()->parseExpression(); |
| 39 | $stream = $this->parser->getStream(); |
| 40 | $stream->expect(/* Token::BLOCK_END_TYPE */ 3); |
| 41 | $body = $this->parser->subparse([$this, 'decideIfFork']); |
| 42 | $tests = [$expr, $body]; |
| 43 | $else = null; |
| 44 | |
| 45 | $end = false; |
| 46 | while (!$end) { |
| 47 | switch ($stream->next()->getValue()) { |
| 48 | case 'else': |
| 49 | $stream->expect(/* Token::BLOCK_END_TYPE */ 3); |
| 50 | $else = $this->parser->subparse([$this, 'decideIfEnd']); |
| 51 | break; |
| 52 | |
| 53 | case 'elseif': |
| 54 | $expr = $this->parser->getExpressionParser()->parseExpression(); |
| 55 | $stream->expect(/* Token::BLOCK_END_TYPE */ 3); |
| 56 | $body = $this->parser->subparse([$this, 'decideIfFork']); |
| 57 | $tests[] = $expr; |
| 58 | $tests[] = $body; |
| 59 | break; |
| 60 | |
| 61 | case 'endif': |
| 62 | $end = true; |
| 63 | break; |
| 64 | |
| 65 | default: |
| 66 | throw new SyntaxError(sprintf('Unexpected end of template. Twig was looking for the following tags "else", "elseif", or "endif" to close the "if" block started at line %d).', $lineno), $stream->getCurrent()->getLine(), $stream->getSourceContext()); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | $stream->expect(/* Token::BLOCK_END_TYPE */ 3); |
| 71 | |
| 72 | return new IfNode(new Node($tests), $else, $lineno, $this->getTag()); |
| 73 | } |
| 74 | |
| 75 | public function decideIfFork(Token $token): bool |
| 76 | { |
| 77 | return $token->test(['elseif', 'else', 'endif']); |
| 78 | } |
| 79 | |
| 80 | public function decideIfEnd(Token $token): bool |
| 81 | { |
| 82 | return $token->test(['endif']); |
| 83 | } |
| 84 | |
| 85 | public function getTag(): string |
| 86 | { |
| 87 | return 'if'; |
| 88 | } |
| 89 | } |