Licenses.php

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

        protected $licenses = array();

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

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

                $this->makeLicenses();
        }

        protected function makeLicenses() {
                $levels = array();
                $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 array( $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(
                                        $this->msg( $key ), '',
                                        array(
                                                'disabled' => 'disabled',
                                                'style' => 'color: GrayText', // for MSIE
                                        ),
                                        $depth
                                );
                                $this->makeHtml( $val, $depth + 1 );
                        } else {
                                $this->html .= $this->outputOption(
                                        $this->msg( $val->text ), $val->template,
                                        array( 'title' => '{{' . $val->template . '}}' ),
                                        $depth
                                );
                        }
        }

        protected function outputOption( $text, $value, $attribs = null, $depth = 0 ) {
                $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";
        }

        protected function msg( $str ) {
                $msg = wfMessage( $str );
                return $msg->exists() ? $msg->text() : $str;
        }

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

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

                $this->html = $this->outputOption( wfMsg( 'nolicense' ), '',
                        (bool)$this->selected ? null : array( 'selected' => 'selected' ) );
                $this->makeHtml( $this->getLicenses() );

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

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

class License {
        var $template;

        var $text;

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

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