Licenses.php

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<?php
class Licenses extends HTMLFormField {
    protected $msg;

    protected $licenses = [];

    protected $html;
    public function __construct( $params ) {
        parent::__construct( $params );

        $this->msg = empty( $params['licenses'] )
            ? wfMessage( 'licenses' )->inContentLanguage()->plain()
            : $params['licenses'];
        $this->selected = null;

        $this->makeLicenses();
    }

    protected function makeLicenses() {
        $levels = [];
        $lines = explode( "\n", $this->msg );

        foreach ( $lines as $line ) {
            if ( strpos( $line, '*' ) !== 0 ) {
                continue;
            } else {
                list( $level, $line ) = $this->trimStars( $line );

                if ( strpos( $line, '|' ) !== false ) {
                    $obj = new License( $line );
                    $this->stackItem( $this->licenses, $levels, $obj );
                } else {
                    if ( $level < count( $levels ) ) {
                        $levels = array_slice( $levels, 0, $level );
                    }
                    if ( $level == count( $levels ) ) {
                        $levels[$level - 1] = $line;
                    } elseif ( $level > count( $levels ) ) {
                        $levels[] = $line;
                    }
                }
            }
        }
    }

    protected function trimStars( $str ) {
        $numStars = strspn( $str, '*' );
        return [ $numStars, ltrim( substr( $str, $numStars ), ' ' ) ];
    }

    protected function stackItem( &$list, $path, $item ) {
        $position =& $list;
        if ( $path ) {
            foreach ( $path as $key ) {
                $position =& $position[$key];
            }
        }
        $position[] = $item;
    }

    protected function makeHtml( $tagset, $depth = 0 ) {
        foreach ( $tagset as $key => $val ) {
            if ( is_array( $val ) ) {
                $this->html .= $this->outputOption(
                    $key, '',
                    [
                        'disabled' => 'disabled',
                        'style' => 'color: GrayText', // for MSIE
                    ],
                    $depth
                );
                $this->makeHtml( $val, $depth + 1 );
            } else {
                $this->html .= $this->outputOption(
                    $val->text, $val->template,
                    [ 'title' => '{{' . $val->template . '}}' ],
                    $depth
                );
            }
        }
    }

    protected function outputOption( $message, $value, $attribs = null, $depth = 0 ) {
        $msgObj = $this->msg( $message );
        $text = $msgObj->exists() ? $msgObj->text() : $message;
        $attribs['value'] = $value;
        if ( $value === $this->selected ) {
            $attribs['selected'] = 'selected';
        }

        $val = str_repeat( /* &nbsp */ "\xc2\xa0", $depth * 2 ) . $text;
        return str_repeat( "\t", $depth ) . Xml::element( 'option', $attribs, $val ) . "\n";
    }

    public function getLicenses() {
        return $this->licenses;
    }

    public function getInputHTML( $value ) {
        $this->selected = $value;

        $this->html = $this->outputOption( wfMessage( 'nolicense' )->text(), '',
            (bool)$this->selected ? null : [ 'selected' => 'selected' ] );
        $this->makeHtml( $this->getLicenses() );

        $attribs = [
            'name' => $this->mName,
            'id' => $this->mID
        ];
        if ( !empty( $this->mParams['disabled'] ) ) {
            $attibs['disabled'] = 'disabled';
        }

        return Html::rawElement( 'select', $attribs, $this->html );
    }
}

class License {
    public $template;

    public $text;

    function __construct( $str ) {
        list( $text, $template ) = explode( '|', strrev( $str ), 2 );

        $this->template = strrev( $template );
        $this->text = strrev( $text );
    }
}