ResourceLoaderWikiModule.php

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<?php
abstract class ResourceLoaderWikiModule extends ResourceLoaderModule {

        /* Protected Members */

        # Origin is user-supplied code
        protected $origin = self::ORIGIN_USER_SITEWIDE;

        // In-object cache for title mtimes
        protected $titleMtimes = array();

        /* Abstract Protected Methods */

        abstract protected function getPages( ResourceLoaderContext $context );

        /* Protected Methods */

        protected function getDB() {
                return wfGetDB( DB_SLAVE );
        }

        protected function getContent( $title ) {
                if ( !$title->isCssJsSubpage() && !$title->isCssOrJsPage() ) {
                        return null;
                }
                $revision = Revision::newFromTitle( $title, false, Revision::READ_NORMAL );
                if ( !$revision ) {
                        return null;
                }

                $content = $revision->getContent( Revision::RAW );

                if ( !$content ) {
                        wfDebug( __METHOD__ . "failed to load content of JS/CSS page!\n" );
                        return null;
                }

                $model = $content->getModel();

                if ( $model !== CONTENT_MODEL_CSS && $model !== CONTENT_MODEL_JAVASCRIPT ) {
                        wfDebug( __METHOD__ . "bad content model $model for JS/CSS page!\n" );
                        return null;
                }

                return $content->getNativeData(); //NOTE: this is safe, we know it's JS or CSS
        }

        /* Methods */

        public function getScript( ResourceLoaderContext $context ) {
                $scripts = '';
                foreach ( $this->getPages( $context ) as $titleText => $options ) {
                        if ( $options['type'] !== 'script' ) {
                                continue;
                        }
                        $title = Title::newFromText( $titleText );
                        if ( !$title || $title->isRedirect() ) {
                                continue;
                        }
                        $script = $this->getContent( $title );
                        if ( strval( $script ) !== '' ) {
                                $script = $this->validateScriptFile( $titleText, $script );
                                if ( strpos( $titleText, '*/' ) === false ) {
                                        $scripts .=  "/* $titleText */\n";
                                }
                                $scripts .= $script . "\n";
                        }
                }
                return $scripts;
        }

        public function getStyles( ResourceLoaderContext $context ) {
                global $wgScriptPath;

                $styles = array();
                foreach ( $this->getPages( $context ) as $titleText => $options ) {
                        if ( $options['type'] !== 'style' ) {
                                continue;
                        }
                        $title = Title::newFromText( $titleText );
                        if ( !$title || $title->isRedirect()  ) {
                                continue;
                        }
                        $media = isset( $options['media'] ) ? $options['media'] : 'all';
                        $style = $this->getContent( $title );
                        if ( strval( $style ) === '' ) {
                                continue;
                        }
                        if ( $this->getFlip( $context ) ) {
                                $style = CSSJanus::transform( $style, true, false );
                        }
                        $style = CSSMin::remap( $style, false, $wgScriptPath, true );
                        if ( !isset( $styles[$media] ) ) {
                                $styles[$media] = array();
                        }
                        if ( strpos( $titleText, '*/' ) === false ) {
                                $style =  "/* $titleText */\n" . $style;
                        }
                        $styles[$media][] = $style;
                }
                return $styles;
        }

        public function getModifiedTime( ResourceLoaderContext $context ) {
                $modifiedTime = 1; // wfTimestamp() interprets 0 as "now"
                $mtimes = $this->getTitleMtimes( $context );
                if ( count( $mtimes ) ) {
                        $modifiedTime = max( $modifiedTime, max( $mtimes ) );
                }
                $modifiedTime = max( $modifiedTime, $this->getMsgBlobMtime( $context->getLanguage() ) );
                return $modifiedTime;
        }

        public function isKnownEmpty( ResourceLoaderContext $context ) {
                return count( $this->getTitleMtimes( $context ) ) == 0;
        }

        protected function getTitleMtimes( ResourceLoaderContext $context ) {
                $dbr = $this->getDB();
                if ( !$dbr ) {
                        // We're dealing with a subclass that doesn't have a DB
                        return array();
                }

                $hash = $context->getHash();
                if ( isset( $this->titleMtimes[$hash] ) ) {
                        return $this->titleMtimes[$hash];
                }

                $this->titleMtimes[$hash] = array();
                $batch = new LinkBatch;
                foreach ( $this->getPages( $context ) as $titleText => $options ) {
                        $batch->addObj( Title::newFromText( $titleText ) );
                }

                if ( !$batch->isEmpty() ) {
                        $res = $dbr->select( 'page',
                                array( 'page_namespace', 'page_title', 'page_touched' ),
                                $batch->constructSet( 'page', $dbr ),
                                __METHOD__
                        );
                        foreach ( $res as $row ) {
                                $title = Title::makeTitle( $row->page_namespace, $row->page_title );
                                $this->titleMtimes[$hash][$title->getPrefixedDBkey()] =
                                        wfTimestamp( TS_UNIX, $row->page_touched );
                        }
                }
                return $this->titleMtimes[$hash];
        }
}