Poem.class.php

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<?php
class Poem {
    public static function init( &$parser ) {
        $parser->setHook( 'poem', [ 'Poem', 'renderPoem' ] );
        return true;
    }
 
    public static function renderPoem( $in, $param = [], $parser = null, $frame = false ) {
        // using newlines in the text will cause the parser to add <p> tags,
        // which may not be desired in some cases
        $newline = isset( $param['compact'] ) ? '' : "\n";
 
        $tag = $parser->insertStripItem( "<br />", $parser->mStripState );
 
        // replace colons with indented spans
        $text = preg_replace_callback( '/^(:+)(.+)$/m', [ 'Poem', 'indentVerse' ], $in );
 
        // replace newlines with <br /> tags unless they are at the beginning or end
        // of the poem
        $text = preg_replace(
            [ "/^\n/", "/\n$/D", "/\n/" ],
            [ "", "", "$tag\n" ],
            $text );
 
        // replace spaces at the beginning of a line with non-breaking spaces
        $text = preg_replace_callback( '/^( +)/m', [ 'Poem', 'replaceSpaces' ], $text );
 
        $text = $parser->recursiveTagParse( $text, $frame );
 
        $attribs = Sanitizer::validateTagAttributes( $param, 'div' );
 
        // Wrap output in a <div> with "poem" class.
        if ( isset( $attribs['class'] ) ) {
            $attribs['class'] = 'poem ' . $attribs['class'];
        } else {
            $attribs['class'] = 'poem';
        }
 
        return Html::rawElement( 'div', $attribs, $newline . trim( $text ) . $newline );
    }
 
    protected static function replaceSpaces( $m ) {
        return str_replace( ' ', '&#160;', $m[1] );
    }
 
    protected static function indentVerse( $m ) {
        $attribs = [
            'class' => 'mw-poem-indented',
            'style' => 'display: inline-block; margin-left: ' . strlen( $m[1] ) . 'em;'
        ];
        // @todo Should this really be raw?
        return Html::rawElement( 'span', $attribs, $m[2] );
    }
}