Mercurial > jdk8-mips64-public > nashorn / file revision

 /*

  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 package jdk.nashorn.api.scripting;

 import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;

 import java.lang.invoke.MethodHandle;

 import jdk.internal.dynalink.beans.StaticClass;

 import jdk.internal.dynalink.linker.LinkerServices;

 import jdk.nashorn.internal.runtime.Context;

 import jdk.nashorn.internal.runtime.ScriptFunction;

 import jdk.nashorn.internal.runtime.ScriptObject;

 import jdk.nashorn.internal.runtime.ScriptRuntime;

 import jdk.nashorn.internal.runtime.linker.Bootstrap;

 /**

  * Utilities that are to be called from script code.

  *

  * @since 1.8u40

  */

 @jdk.Exported

 public final class ScriptUtils {

     private ScriptUtils() {}

     /**

      * Returns AST as JSON compatible string. This is used to

      * implement "parse" function in resources/parse.js script.

      *

      * @param code code to be parsed

      * @param name name of the code source (used for location)

      * @param includeLoc tells whether to include location information for nodes or not

      * @return JSON string representation of AST of the supplied code

      */

     public static String parse(final String code, final String name, final boolean includeLoc) {

         return ScriptRuntime.parse(code, name, includeLoc);

     }

     /**

      * Method which converts javascript types to java types for the

      * String.format method (jrunscript function sprintf).

      *

      * @param format a format string

      * @param args arguments referenced by the format specifiers in format

      * @return a formatted string

      */

     public static String format(final String format, final Object[] args) {

         return Formatter.format(format, args);

     }

     /**

      * Create a wrapper function that calls {@code func} synchronized on {@code sync} or, if that is undefined,

      * {@code self}. Used to implement "sync" function in resources/mozilla_compat.js.

      *

      * @param func the function to wrap

      * @param sync the object to synchronize on

      * @return a synchronizing wrapper function

      * @throws IllegalArgumentException if func does not represent a script function

      */

     public static Object makeSynchronizedFunction(final Object func, final Object sync) {

         final Object unwrapped = unwrap(func);

         if (unwrapped instanceof ScriptFunction) {

             return ((ScriptFunction)unwrapped).createSynchronized(unwrap(sync));

         }

         throw new IllegalArgumentException();

     }

     /**

      * Make a script object mirror on given object if needed.

      *

      * @param obj object to be wrapped

      * @return wrapped object

      * @throws IllegalArgumentException if obj cannot be wrapped

      */

     public static ScriptObjectMirror wrap(final Object obj) {

         if (obj instanceof ScriptObjectMirror) {

             return (ScriptObjectMirror)obj;

         }

         if (obj instanceof ScriptObject) {

             final ScriptObject sobj = (ScriptObject)obj;

             return (ScriptObjectMirror) ScriptObjectMirror.wrap(sobj, Context.getGlobal());

         }

         throw new IllegalArgumentException();

     }

     /**

      * Unwrap a script object mirror if needed.

      *

      * @param obj object to be unwrapped

      * @return unwrapped object

      */

     public static Object unwrap(final Object obj) {

         if (obj instanceof ScriptObjectMirror) {

             return ScriptObjectMirror.unwrap(obj, Context.getGlobal());

         }

         return obj;

     }

     /**

      * Wrap an array of object to script object mirrors if needed.

      *

      * @param args array to be unwrapped

      * @return wrapped array

      */

     public static Object[] wrapArray(final Object[] args) {

         if (args == null || args.length == 0) {

             return args;

         }

         return ScriptObjectMirror.wrapArray(args, Context.getGlobal());

     }

     /**

      * Unwrap an array of script object mirrors if needed.

      *

      * @param args array to be unwrapped

      * @return unwrapped array

      */

     public static Object[] unwrapArray(final Object[] args) {

         if (args == null || args.length == 0) {

             return args;

         }

         return ScriptObjectMirror.unwrapArray(args, Context.getGlobal());

     }

     /**

      * Convert the given object to the given type.

      *

      * @param obj object to be converted

      * @param type destination type to convert to. type is either a Class

      * or nashorn representation of a Java type returned by Java.type() call in script.

      * @return converted object

      */

     public static Object convert(final Object obj, final Object type) {

         if (obj == null) {

             return null;

         }

         final Class<?> clazz;

         if (type instanceof Class) {

             clazz = (Class<?>)type;

         } else if (type instanceof StaticClass) {

             clazz = ((StaticClass)type).getRepresentedClass();

         } else {

             throw new IllegalArgumentException("type expected");

         }

         final LinkerServices linker = Bootstrap.getLinkerServices();

         final Object objToConvert = unwrap(obj);

         final MethodHandle converter = linker.getTypeConverter(objToConvert.getClass(),  clazz);

         if (converter == null) {

             // no supported conversion!

             throw new UnsupportedOperationException("conversion not supported");

         }

         try {

             return converter.invoke(objToConvert);

         } catch (final RuntimeException | Error e) {

             throw e;

         } catch (final Throwable t) {

             throw new RuntimeException(t);

         }

     }

 }