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| 1 | <?php |
| 2 | declare( strict_types = 1 ); |
| 3 | |
| 4 | namespace MediaWiki\Extension\Poem\Parsoid; |
| 5 | |
| 6 | use Wikimedia\Parsoid\DOM\DocumentFragment; |
| 7 | use Wikimedia\Parsoid\Ext\ExtensionTagHandler; |
| 8 | use Wikimedia\Parsoid\Ext\ParsoidExtensionAPI; |
| 9 | use Wikimedia\Parsoid\Ext\PHPUtils; |
| 10 | use Wikimedia\Parsoid\Utils\DOMCompat; |
| 11 | |
| 12 | class Poem extends ExtensionTagHandler { |
| 13 | /** @inheritDoc */ |
| 14 | public function sourceToDom( |
| 15 | ParsoidExtensionAPI $extApi, string $content, array $extArgs |
| 16 | ): DocumentFragment { |
| 17 | /* |
| 18 | * Transform wikitext found in <poem>...</poem> |
| 19 | * 1. Strip leading & trailing newlines |
| 20 | * 2. Suppress indent-pre by replacing leading space with |
| 21 | * 3. Replace colons with <span class='...' style='...'>...</span> |
| 22 | * 4. Add <br/> for newlines except (a) in nowikis (b) after ---- |
| 23 | */ |
| 24 | |
| 25 | if ( strlen( $content ) > 0 ) { |
| 26 | // 1. above |
| 27 | $content = PHPUtils::stripPrefix( $content, "\n" ); |
| 28 | $content = PHPUtils::stripSuffix( $content, "\n" ); |
| 29 | |
| 30 | // 2. above |
| 31 | $content = preg_replace( '/^ /m', ' ', $content ); |
| 32 | |
| 33 | // 3. above |
| 34 | $contentArray = explode( "\n", $content ); |
| 35 | $contentMap = array_map( static function ( $line ) use ( $extApi ) { |
| 36 | $i = 0; |
| 37 | $lineLength = strlen( $line ); |
| 38 | while ( $i < $lineLength && $line[$i] === ':' ) { |
| 39 | $i++; |
| 40 | } |
| 41 | if ( $i > 0 && $i < $lineLength ) { |
| 42 | $domFragment = $extApi->htmlToDom( '' ); |
| 43 | $doc = $domFragment->ownerDocument; |
| 44 | $span = $doc->createElement( 'span' ); |
| 45 | $span->setAttribute( 'class', 'mw-poem-indented' ); |
| 46 | $span->setAttribute( 'style', 'display: inline-block; margin-inline-start: ' . $i . 'em;' ); |
| 47 | // $line isn't an HTML text node, it's wikitext that will be passed to extTagToDOM |
| 48 | return substr( DOMCompat::getOuterHTML( $span ), 0, -7 ) . |
| 49 | ltrim( $line, ':' ) . '</span>'; |
| 50 | } else { |
| 51 | return $line; |
| 52 | } |
| 53 | }, $contentArray ); |
| 54 | // TODO: Use faster? preg_replace |
| 55 | $content = implode( "\n", $contentMap ); |
| 56 | |
| 57 | // 4. above |
| 58 | // Split on <nowiki>..</nowiki> fragments. |
| 59 | // Process newlines inside nowikis in a post-processing pass. |
| 60 | // If <br/>s are added here, Parsoid will escape them to plaintext. |
| 61 | $splitContent = preg_split( '/(<nowiki>[\s\S]*?<\/nowiki>)/', $content, |
| 62 | -1, PREG_SPLIT_DELIM_CAPTURE ); |
| 63 | $content = implode( '', |
| 64 | array_map( static function ( $p, $i ) { |
| 65 | if ( $i % 2 === 1 ) { |
| 66 | return $p; |
| 67 | } |
| 68 | |
| 69 | // This is a hack that exploits the fact that </poem> |
| 70 | // cannot show up in the extension's content. |
| 71 | return preg_replace( '/^(-+)<\/poem>/m', "\$1\n", |
| 72 | preg_replace( '/\n/m', "<br/>\n", |
| 73 | preg_replace( '/(^----+)\n/m', '$1</poem>', $p ) ) ); |
| 74 | }, |
| 75 | $splitContent, |
| 76 | range( 0, count( $splitContent ) - 1 ) ) |
| 77 | ); |
| 78 | |
| 79 | } |
| 80 | |
| 81 | // Add the 'poem' class to the 'class' attribute, or if not found, add it |
| 82 | $value = $extApi->findAndUpdateArg( $extArgs, 'class', static function ( string $value ) { |
| 83 | return strlen( $value ) ? "poem {$value}" : 'poem'; |
| 84 | } ); |
| 85 | |
| 86 | if ( !$value ) { |
| 87 | $extApi->addNewArg( $extArgs, 'class', 'poem' ); |
| 88 | } |
| 89 | |
| 90 | return $extApi->extTagToDOM( $extArgs, $content, [ |
| 91 | 'wrapperTag' => 'div', |
| 92 | 'parseOpts' => [ 'extTag' => 'poem' ], |
| 93 | // Create new frame, because $content doesn't literally appear in |
| 94 | // the parent frame's sourceText (our copy has been munged) |
| 95 | 'processInNewFrame' => true, |
| 96 | // We've shifted the content around quite a bit when we preprocessed |
| 97 | // it. In the future if we wanted to enable selser inside the <poem> |
| 98 | // body we should create a proper offset map and then apply it to the |
| 99 | // result after the parse, like we do in the Gallery extension. |
| 100 | // But for now, since we don't selser the contents, just strip the |
| 101 | // DSR info so it doesn't cause problems/confusion with unicode |
| 102 | // offset conversion (and so it's clear you can't selser what we're |
| 103 | // currently emitting). |
| 104 | 'clearDSROffsets' => true |
| 105 | ] |
| 106 | ); |
| 107 | } |
| 108 | } |