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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\Poem; |
| 4 | |
| 5 | use MediaWiki\Hook\ParserFirstCallInitHook; |
| 6 | use MediaWiki\Html\Html; |
| 7 | use MediaWiki\Parser\Sanitizer; |
| 8 | use Parser; |
| 9 | use PPFrame; |
| 10 | |
| 11 | /** |
| 12 | * This class handles formatting poems in WikiText, specifically anything within |
| 13 | * <poem></poem> tags. |
| 14 | * |
| 15 | * @license CC0-1.0 |
| 16 | * @author Nikola Smolenski <smolensk@eunet.yu> |
| 17 | */ |
| 18 | class Poem implements ParserFirstCallInitHook { |
| 19 | /** |
| 20 | * Bind the renderPoem function to the <poem> tag |
| 21 | * @param Parser $parser |
| 22 | */ |
| 23 | public function onParserFirstCallInit( $parser ) { |
| 24 | $parser->setHook( 'poem', [ $this, 'renderPoem' ] ); |
| 25 | } |
| 26 | |
| 27 | /** |
| 28 | * Parse the text into proper poem format |
| 29 | * @param string|null $in The text inside the poem tag |
| 30 | * @param string[] $param |
| 31 | * @param Parser $parser |
| 32 | * @param PPFrame $frame |
| 33 | * @return string |
| 34 | */ |
| 35 | public function renderPoem( $in, array $param, Parser $parser, PPFrame $frame ) { |
| 36 | // using newlines in the text will cause the parser to add <p> tags, |
| 37 | // which may not be desired in some cases |
| 38 | $newline = isset( $param['compact'] ) ? '' : "\n"; |
| 39 | |
| 40 | $tag = $parser->insertStripItem( "<br />" ); |
| 41 | |
| 42 | // replace colons with indented spans |
| 43 | $text = preg_replace_callback( |
| 44 | '/^(:++)(.+)$/m', |
| 45 | static function ( array $matches ) { |
| 46 | $indentation = strlen( $matches[1] ) . 'em'; |
| 47 | return Html::rawElement( |
| 48 | 'span', |
| 49 | [ |
| 50 | 'class' => 'mw-poem-indented', |
| 51 | 'style' => 'display: inline-block; ' . |
| 52 | "margin-inline-start: $indentation;", |
| 53 | ], |
| 54 | $matches[2] |
| 55 | ); |
| 56 | }, |
| 57 | $in |
| 58 | ); |
| 59 | |
| 60 | // replace newlines with <br /> tags unless they are at the beginning or end |
| 61 | // of the poem, or would directly follow exactly 4 dashes. See Parser::internalParse() for |
| 62 | // the exact syntax for horizontal rules. |
| 63 | $text = preg_replace( |
| 64 | [ '/^\n/', '/\n$/D', '/(?<!^----)\n/m' ], |
| 65 | [ "", "", "$tag\n" ], |
| 66 | $text |
| 67 | ); |
| 68 | |
| 69 | // replace spaces at the beginning of a line with non-breaking spaces |
| 70 | $text = preg_replace_callback( |
| 71 | '/^ +/m', |
| 72 | static function ( array $matches ) { |
| 73 | return str_repeat( ' ', strlen( $matches[0] ) ); |
| 74 | }, |
| 75 | $text |
| 76 | ); |
| 77 | |
| 78 | $text = $parser->recursiveTagParse( $text, $frame ); |
| 79 | |
| 80 | // Because of limitations of the regular expression above, horizontal rules with more than 4 |
| 81 | // dashes still need special handling. |
| 82 | $text = str_replace( '<hr />' . $tag, '<hr />', $text ); |
| 83 | |
| 84 | $attribs = Sanitizer::validateTagAttributes( $param, 'div' ); |
| 85 | |
| 86 | // Wrap output in a <div> with "poem" class. |
| 87 | if ( isset( $attribs['class'] ) ) { |
| 88 | $attribs['class'] = 'poem ' . $attribs['class']; |
| 89 | } else { |
| 90 | $attribs['class'] = 'poem'; |
| 91 | } |
| 92 | |
| 93 | return Html::rawElement( 'div', $attribs, $newline . trim( $text ) . $newline ); |
| 94 | } |
| 95 | } |