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<?php
/**
* This class handles formatting poems in WikiText, specifically anything within
* <poem></poem> tags.
*/
class Poem {
/**
* Bind the renderPoem function to the <poem> tag
* @param Parser &$parser
* @return bool true
*/
public static function init( &$parser ) {
$parser->setHook( 'poem', [ 'Poem', 'renderPoem' ] );
return true;
}
/**
* Parse the text into proper poem format
* @param string $in The text inside the poem tag
* @param array $param
* @param Parser $parser
* @param bool $frame
* @return string
*/
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 );
}
/**
* Callback for preg_replace_callback() that replaces spaces with non-breaking spaces
* @param array $m Matches from the regular expression
* - $m[1] consists of 1 or more spaces
* @return mixed
*/
protected static function replaceSpaces( $m ) {
return str_replace( ' ', ' ', $m[1] );
}
/**
* Callback for preg_replace_callback() that wraps content in an indented span
* @param array $m Matches from the regular expression
* - $m[1] consists of 1 or more colons
* - $m[2] consists of the text after the colons
* @return string
*/
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] );
}
}
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