SpecialComparePages.php

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<?php
class SpecialComparePages extends SpecialPage {

        // Stored objects
        protected $opts, $skin;

        // Some internal settings
        protected $showNavigation = false;

        public function __construct() {
                parent::__construct( 'ComparePages' );
        }

        public function execute( $par ) {
                $this->setHeaders();
                $this->outputHeader();

                $form = new HTMLForm( array(
                        'Page1' => array(
                                'type' => 'text',
                                'name' => 'page1',
                                'label-message' => 'compare-page1',
                                'size' => '40',
                                'section' => 'page1',
                                'validation-callback' => array( $this, 'checkExistingTitle' ),
                        ),
                        'Revision1' => array(
                                'type' => 'int',
                                'name' => 'rev1',
                                'label-message' => 'compare-rev1',
                                'size' => '8',
                                'section' => 'page1',
                                'validation-callback' => array( $this, 'checkExistingRevision' ),
                        ),
                        'Page2' => array(
                                'type' => 'text',
                                'name' => 'page2',
                                'label-message' => 'compare-page2',
                                'size' => '40',
                                'section' => 'page2',
                                'validation-callback' => array( $this, 'checkExistingTitle' ),
                        ),
                        'Revision2' => array(
                                'type' => 'int',
                                'name' => 'rev2',
                                'label-message' => 'compare-rev2',
                                'size' => '8',
                                'section' => 'page2',
                                'validation-callback' => array( $this, 'checkExistingRevision' ),
                        ),
                        'Action' => array(
                                'type' => 'hidden',
                                'name' => 'action',
                        ),
                        'Diffonly' => array(
                                'type' => 'hidden',
                                'name' => 'diffonly',
                        ),
                        'Unhide' => array(
                                'type' => 'hidden',
                                'name' => 'unhide',
                        ),
                ), $this->getContext(), 'compare' );
                $form->setSubmitTextMsg( 'compare-submit' );
                $form->suppressReset();
                $form->setMethod( 'get' );
                $form->setSubmitCallback( array( __CLASS__, 'showDiff' ) );

                $form->loadData();
                $form->displayForm( '' );
                $form->trySubmit();
        }

        public static function showDiff( $data, HTMLForm $form ){
                $rev1 = self::revOrTitle( $data['Revision1'], $data['Page1'] );
                $rev2 = self::revOrTitle( $data['Revision2'], $data['Page2'] );

                if( $rev1 && $rev2 ) {
                        $de = new DifferenceEngine( $form->getContext(),
                                $rev1,
                                $rev2,
                                null, // rcid
                                ( $data['Action'] == 'purge' ),
                                ( $data['Unhide'] == '1' )
                        );
                        $de->showDiffPage( true );
                }
        }

        public static function revOrTitle( $revision, $title ) {
                if( $revision ){
                        return $revision;
                } elseif( $title ) {
                        $title = Title::newFromText( $title );
                        if( $title instanceof Title ){
                                return $title->getLatestRevID();
                        }
                }
                return null;
        }

        public function checkExistingTitle( $value, $alldata ) {
                if ( $value === '' || $value === null ) {
                        return true;
                }
                $title = Title::newFromText( $value );
                if ( !$title instanceof Title ) {
                        return $this->msg( 'compare-invalid-title' )->parseAsBlock();
                }
                if ( !$title->exists() ) {
                        return $this->msg( 'compare-title-not-exists' )->parseAsBlock();
                }
                return true;
        }

        public function checkExistingRevision( $value, $alldata ) {
                if ( $value === '' || $value === null ) {
                        return true;
                }
                $revision = Revision::newFromId( $value );
                if ( $revision === null ) {
                        return $this->msg( 'compare-revision-not-exists' )->parseAsBlock();
                }
                return true;
        }
}