Init.php

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<?php
class MWInit {
        static $compilerVersion;

        static function getCompilerVersion() {
                if ( self::$compilerVersion === null ) {
                        if ( self::functionExists( 'wfHipHopCompilerVersion' ) ) {
                                self::$compilerVersion = wfHipHopCompilerVersion();
                        } else {
                                self::$compilerVersion = false;
                        }
                }
                return self::$compilerVersion;
        }

        static function isHipHop() {
                return function_exists( 'hphp_thread_set_warmup_enabled' );
        }

        static function interpretedPath( $file ) {
                global $IP;
                return "$IP/$file";
        }

        static function compiledPath( $file ) {
                global $IP;

                if ( defined( 'MW_COMPILED' ) ) {
                        return "phase3/$file";
                } else {
                        return "$IP/$file";
                }
        }

        static function extInterpretedPath( $file ) {
                return self::getExtensionsDirectory() . '/' . $file;
        }

        static function extCompiledPath( $file ) {
                if ( defined( 'MW_COMPILED' ) ) {
                        return "extensions/$file";
                } else {
                        return self::getExtensionsDirectory() . '/' . $file;
                }
        }

        static function extSetupPath( $extRel ) {
                $baseRel = "extensions/$extRel";
                if ( defined( 'MW_COMPILED' ) ) {
                        return $baseRel;
                } else {
                        global $wgCompiledFiles;
                        $wgCompiledFiles[] = $baseRel;
                        return self::getExtensionsDirectory() . '/' . $extRel;
                }
        }

        static function getExtensionsDirectory() {
                global $wgExtensionsDirectory, $IP;
                if ( $wgExtensionsDirectory === false ) {
                        $wgExtensionsDirectory = "$IP/../extensions";
                }
                return $wgExtensionsDirectory;
        }

        static function classExists( $class ) {
                try {
                        $r = new ReflectionClass( $class );
                } catch( ReflectionException $r ) {
                        $r = false;
                }
                return $r !== false;
        }

        static function methodExists( $class, $method ) {
                try {
                        $r = new ReflectionMethod( $class, $method );
                } catch( ReflectionException $r ) {
                        $r = false;
                }
                return $r !== false;
        }

        static function functionExists( $function ) {
                try {
                        $r = new ReflectionFunction( $function );
                } catch( ReflectionException $r ) {
                        $r = false;
                }
                return $r !== false;
        }

        static function callStaticMethod( $className, $methodName, $args ) {
                $r = new ReflectionMethod( $className, $methodName );
                return $r->invokeArgs( null, $args );
        }
}