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/*
* 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 java.lang.invoke.MethodHandle;
import jdk.internal.dynalink.beans.StaticClass;
import jdk.internal.dynalink.linker.LinkerServices;
import jdk.nashorn.internal.runtime.linker.Bootstrap;
import jdk.nashorn.internal.runtime.Context;
import jdk.nashorn.internal.runtime.ScriptFunction;
import jdk.nashorn.internal.runtime.ScriptObject;
import jdk.nashorn.internal.runtime.ScriptRuntime;
/**
* Utilities that are to be called from script code.
*/
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 invoke
* @param sync the object to synchronize on
* @return a synchronizing wrapper function
*/
public static Object makeSynchronizedFunction(final ScriptFunction func, final Object sync) {
return func.makeSynchronizedFunction(sync);
}
/**
* Make a script object mirror on given object if needed.
*
* @param obj object to be wrapped
* @return wrapped object
*/
public static Object wrap(final Object obj) {
if (obj instanceof ScriptObject) {
return ScriptObjectMirror.wrap(obj, Context.getGlobal());
}
return obj;
}
/**
* 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
* @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 MethodHandle converter = linker.getTypeConverter(obj.getClass(), clazz);
if (converter == null) {
// no supported conversion!
throw new UnsupportedOperationException("conversion not supported");
}
try {
return converter.invoke(obj);
} catch (final RuntimeException | Error e) {
throw e;
} catch (final Throwable t) {
throw new RuntimeException(t);
}
}
}
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