AlphabeticPager.php

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<?php
abstract class AlphabeticPager extends IndexPager {

    function getNavigationBar() {
        if ( !$this->isNavigationBarShown() ) {
            return '';
        }

        if ( isset( $this->mNavigationBar ) ) {
            return $this->mNavigationBar;
        }

        $linkTexts = [
            'prev' => $this->msg( 'prevn' )->numParams( $this->mLimit )->escaped(),
            'next' => $this->msg( 'nextn' )->numParams( $this->mLimit )->escaped(),
            'first' => $this->msg( 'page_first' )->escaped(),
            'last' => $this->msg( 'page_last' )->escaped()
        ];

        $lang = $this->getLanguage();

        $pagingLinks = $this->getPagingLinks( $linkTexts );
        $limitLinks = $this->getLimitLinks();
        $limits = $lang->pipeList( $limitLinks );

        $this->mNavigationBar = $this->msg( 'parentheses' )->rawParams(
            $lang->pipeList( [ $pagingLinks['first'],
            $pagingLinks['last'] ] ) )->escaped() . " " .
            $this->msg( 'viewprevnext' )->rawParams( $pagingLinks['prev'],
                $pagingLinks['next'], $limits )->escaped();

        if ( !is_array( $this->getIndexField() ) ) {
            # Early return to avoid undue nesting
            return $this->mNavigationBar;
        }

        $extra = '';
        $first = true;
        $msgs = $this->getOrderTypeMessages();
        foreach ( array_keys( $msgs ) as $order ) {
            if ( $first ) {
                $first = false;
            } else {
                $extra .= $this->msg( 'pipe-separator' )->escaped();
            }

            if ( $order == $this->mOrderType ) {
                $extra .= $this->msg( $msgs[$order] )->escaped();
            } else {
                $extra .= $this->makeLink(
                    $this->msg( $msgs[$order] )->escaped(),
                    [ 'order' => $order ]
                );
            }
        }

        if ( $extra !== '' ) {
            $extra = ' ' . $this->msg( 'parentheses' )->rawParams( $extra )->escaped();
            $this->mNavigationBar .= $extra;
        }

        return $this->mNavigationBar;
    }

    protected function getOrderTypeMessages() {
        return null;
    }
}