diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/jdk.scripting.nashorn/share/classes/jdk/nashorn/api/scripting/ScriptUtils.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/api/scripting/ScriptUtils.java Tue Sep 12 19:03:39 2017 +0200 @@ -0,0 +1,188 @@ +/* + * 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.dynalink.beans.StaticClass; +import jdk.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 + */ +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); + } + } +}