1 /* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.nashorn.api.scripting; 27 28 import java.lang.invoke.MethodHandle; 29 import jdk.internal.dynalink.beans.StaticClass; 30 import jdk.internal.dynalink.linker.LinkerServices; 31 import jdk.nashorn.internal.runtime.Context; 32 import jdk.nashorn.internal.runtime.ScriptFunction; 33 import jdk.nashorn.internal.runtime.ScriptObject; 34 import jdk.nashorn.internal.runtime.ScriptRuntime; 35 import jdk.nashorn.internal.runtime.linker.Bootstrap; 36 37 /** 38 * Utilities that are to be called from script code. 39 */ 40 public final class ScriptUtils { 41 private ScriptUtils() {} 42 43 /** 44 * Returns AST as JSON compatible string. This is used to 45 * implement "parse" function in resources/parse.js script. 46 * 47 * @param code code to be parsed 48 * @param name name of the code source (used for location) 49 * @param includeLoc tells whether to include location information for nodes or not 50 * @return JSON string representation of AST of the supplied code 51 */ 52 public static String parse(final String code, final String name, final boolean includeLoc) { 53 return ScriptRuntime.parse(code, name, includeLoc); 54 } 55 56 /** 57 * Method which converts javascript types to java types for the 58 * String.format method (jrunscript function sprintf). 59 * 60 * @param format a format string 61 * @param args arguments referenced by the format specifiers in format 62 * @return a formatted string 63 */ 64 public static String format(final String format, final Object[] args) { 65 return Formatter.format(format, args); 66 } 67 68 /** 69 * Create a wrapper function that calls {@code func} synchronized on {@code sync} or, if that is undefined, 70 * {@code self}. Used to implement "sync" function in resources/mozilla_compat.js. 71 * 72 * @param func the function to invoke 73 * @param sync the object to synchronize on 74 * @return a synchronizing wrapper function 75 */ 76 public static Object makeSynchronizedFunction(final ScriptFunction func, final Object sync) { 77 return func.makeSynchronizedFunction(sync); 78 } 79 80 /** 81 * Make a script object mirror on given object if needed. 82 * 83 * @param obj object to be wrapped 84 * @return wrapped object 85 */ 86 public static Object wrap(final Object obj) { 87 if (obj instanceof ScriptObject) { 88 return ScriptObjectMirror.wrap(obj, Context.getGlobal()); 89 } 90 91 return obj; 92 } 93 94 /** 95 * Unwrap a script object mirror if needed. 96 * 97 * @param obj object to be unwrapped 98 * @return unwrapped object 99 */ 100 public static Object unwrap(final Object obj) { 101 if (obj instanceof ScriptObjectMirror) { 102 return ScriptObjectMirror.unwrap(obj, Context.getGlobal()); 103 } 104 105 return obj; 106 } 107 108 /** 109 * Wrap an array of object to script object mirrors if needed. 110 * 111 * @param args array to be unwrapped 112 * @return wrapped array 113 */ 114 public static Object[] wrapArray(final Object[] args) { 115 if (args == null || args.length == 0) { 116 return args; 117 } 118 119 return ScriptObjectMirror.wrapArray(args, Context.getGlobal()); 120 } 121 122 /** 123 * Unwrap an array of script object mirrors if needed. 124 * 125 * @param args array to be unwrapped 126 * @return unwrapped array 127 */ 128 public static Object[] unwrapArray(final Object[] args) { 129 if (args == null || args.length == 0) { 130 return args; 131 } 132 133 return ScriptObjectMirror.unwrapArray(args, Context.getGlobal()); 134 } 135 136 /** 137 * Convert the given object to the given type. 138 * 139 * @param obj object to be converted 140 * @param type destination type to convert to 141 * @return converted object 142 */ 143 public static Object convert(final Object obj, final Object type) { 144 if (obj == null) { 145 return null; 146 } 147 148 final Class<?> clazz; 149 if (type instanceof Class) { 150 clazz = (Class<?>)type; 151 } else if (type instanceof StaticClass) { 152 clazz = ((StaticClass)type).getRepresentedClass(); 153 } else { 154 throw new IllegalArgumentException("type expected"); 155 } 156 157 final LinkerServices linker = Bootstrap.getLinkerServices(); 158 final MethodHandle converter = linker.getTypeConverter(obj.getClass(), clazz); 159 if (converter == null) { 160 // no supported conversion! 161 throw new UnsupportedOperationException("conversion not supported"); 162 } 163 164 try { 165 return converter.invoke(obj); 166 } catch (final RuntimeException | Error e) { 167 throw e; 168 } catch (final Throwable t) { 169 throw new RuntimeException(t); 170 } 171 } 172 } --- EOF ---