UpdatedDefinitionAid.php

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<?php
class UpdatedDefinitionAid extends TranslationAid {
    public function getData() {
        $db = wfGetDB( DB_MASTER );
        $conds = array(
            'rt_page' => $this->handle->getTitle()->getArticleID(),
            'rt_type' => RevTag::getType( 'tp:transver' ),
        );
        $options = array(
            'ORDER BY' => 'rt_revision DESC',
        );

        $translationRevision = $db->selectField( 'revtag', 'rt_value', $conds, __METHOD__, $options );
        if ( $translationRevision === false ) {
            throw new TranslationHelperException( "No definition revision recorded" );
        }

        $definitionTitle = Title::makeTitleSafe(
            $this->handle->getTitle()->getNamespace(),
            $this->handle->getKey() . '/' . $this->group->getSourceLanguage()
        );

        if ( !$definitionTitle || !$definitionTitle->exists() ) {
            throw new TranslationHelperException( "Definition page doesn't exist" );
        }

        // Using newFromId instead of newFromTitle, because the page might have been renamed
        $oldrev = Revision::newFromId( $translationRevision );
        if ( !$oldrev ) {
            throw new TranslationHelperException( "Old definition version doesn't exist anymore" );
        }

        $oldtext = $oldrev->getText();
        $newtext = $this->getDefinition();

        if ( $oldtext === $newtext ) {
            throw new TranslationHelperException( "No changes" );
        }

        $diff = new DifferenceEngine;
        if ( method_exists( 'DifferenceEngine', 'setTextLanguage' ) ) {
            $diff->setTextLanguage( $this->group->getSourceLanguage() );
        }
        $diff->setText( $oldtext, $newtext );
        $diff->setReducedLineNumbers();
        $diff->showDiffStyle();

        $html = $diff->getDiff(
            $this->context->msg( 'tpt-diff-old' )->escaped(),
            $this->context->msg( 'tpt-diff-new' )->escaped()
        );

        return array(
            'value_old' => $oldtext,
            'value_new' => $newtext,
            'revisionid_old' => $oldrev->getId(),
            'revisionid_new' => $definitionTitle->getLatestRevId(),
            'language' => $this->group->getSourceLanguage(),
            'html' => $html,
        );
    }
}