WebInstallerInstall.php

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<?php
class WebInstallerInstall extends WebInstallerPage {

    public function isSlow() {
        return true;
    }

    public function execute() {
        if ( $this->getVar( '_UpgradeDone' ) ) {
            return 'skip';
        } elseif ( $this->getVar( '_InstallDone' ) ) {
            return 'continue';
        } elseif ( $this->parent->request->wasPosted() ) {
            $this->startForm();
            $this->addHTML( "<ul>" );
            $results = $this->parent->performInstallation(
                [ $this, 'startStage' ],
                [ $this, 'endStage' ]
            );
            $this->addHTML( "</ul>" );
            // PerformInstallation bails on a fatal, so make sure the last item
            // completed before giving 'next.' Likewise, only provide back on failure
            $lastStep = end( $results );
            $continue = $lastStep->isOK() ? 'continue' : false;
            $back = $lastStep->isOK() ? false : 'back';
            $this->endForm( $continue, $back );
        } else {
            $this->startForm();
            $this->addHTML( $this->parent->getInfoBox( wfMessage( 'config-install-begin' )->plain() ) );
            $this->endForm();
        }

        return true;
    }

    public function startStage( $step ) {
        // Messages: config-install-database, config-install-tables, config-install-interwiki,
        // config-install-stats, config-install-keys, config-install-sysop, config-install-mainpage
        $this->addHTML( "<li>" . wfMessage( "config-install-$step" )->escaped() .
            wfMessage( 'ellipsis' )->escaped() );

        if ( $step == 'extension-tables' ) {
            $this->startLiveBox();
        }
    }

    public function endStage( $step, $status ) {
        if ( $step == 'extension-tables' ) {
            $this->endLiveBox();
        }
        $msg = $status->isOK() ? 'config-install-step-done' : 'config-install-step-failed';
        $html = wfMessage( 'word-separator' )->escaped() . wfMessage( $msg )->escaped();
        if ( !$status->isOK() ) {
            $html = "<span class=\"error\">$html</span>";
        }
        $this->addHTML( $html . "</li>\n" );
        if ( !$status->isGood() ) {
            $this->parent->showStatusBox( $status );
        }
    }

}