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 static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED; 29 30 import java.lang.invoke.MethodHandle; 31 import jdk.internal.dynalink.beans.StaticClass; 32 import jdk.internal.dynalink.linker.LinkerServices; 33 import jdk.nashorn.internal.runtime.Context; 34 import jdk.nashorn.internal.runtime.ScriptFunction; 35 import jdk.nashorn.internal.runtime.ScriptObject; 36 import jdk.nashorn.internal.runtime.ScriptRuntime; 37 import jdk.nashorn.internal.runtime.linker.Bootstrap; 38 39 /** 40 * Utilities that are to be called from script code. 41 */ 42 public final class ScriptUtils { 43 private ScriptUtils() {} 44 45 /** 46 * Returns AST as JSON compatible string. This is used to 47 * implement "parse" function in resources/parse.js script. 48 * 49 * @param code code to be parsed 50 * @param name name of the code source (used for location) 51 * @param includeLoc tells whether to include location information for nodes or not 52 * @return JSON string representation of AST of the supplied code 53 */ 54 public static String parse(final String code, final String name, final boolean includeLoc) { 55 return ScriptRuntime.parse(code, name, includeLoc); 56 } 57 58 /** 59 * Method which converts javascript types to java types for the 60 * String.format method (jrunscript function sprintf). 61 * 62 * @param format a format string 63 * @param args arguments referenced by the format specifiers in format 64 * @return a formatted string 65 */ 66 public static String format(final String format, final Object[] args) { 67 return Formatter.format(format, args); 68 } 69 70 /** 71 * Create a wrapper function that calls {@code func} synchronized on {@code sync} or, if that is undefined, 72 * {@code self}. Used to implement "sync" function in resources/mozilla_compat.js. 73 * 74 * @param func the function to wrap 75 * @param sync the object to synchronize on 76 * @return a synchronizing wrapper function 77 */ 78 public static Object makeSynchronizedFunction(final Object func, final Object sync) { 79 return func instanceof ScriptFunction? 80 ((ScriptFunction)func).makeSynchronizedFunction(sync) : UNDEFINED; 81 } 82 83 /** 84 * Make a script object mirror on given object if needed. 85 * 86 * @param obj object to be wrapped 87 * @return wrapped object 88 */ 89 public static Object wrap(final Object obj) { 90 if (obj instanceof ScriptObject) { 91 return ScriptObjectMirror.wrap(obj, Context.getGlobal()); 92 } 93 94 return obj; 95 } 96 97 /** 98 * Unwrap a script object mirror if needed. 99 * 100 * @param obj object to be unwrapped 101 * @return unwrapped object 102 */ 103 public static Object unwrap(final Object obj) { 104 if (obj instanceof ScriptObjectMirror) { 105 return ScriptObjectMirror.unwrap(obj, Context.getGlobal()); 106 } 107 108 return obj; 109 } 110 111 /** 112 * Wrap an array of object to script object mirrors if needed. 113 * 114 * @param args array to be unwrapped 115 * @return wrapped array 116 */ 117 public static Object[] wrapArray(final Object[] args) { 118 if (args == null || args.length == 0) { 119 return args; 120 } 121 122 return ScriptObjectMirror.wrapArray(args, Context.getGlobal()); 123 } 124 125 /** 126 * Unwrap an array of script object mirrors if needed. 127 * 128 * @param args array to be unwrapped 129 * @return unwrapped array 130 */ 131 public static Object[] unwrapArray(final Object[] args) { 132 if (args == null || args.length == 0) { 133 return args; 134 } 135 136 return ScriptObjectMirror.unwrapArray(args, Context.getGlobal()); 137 } 138 139 /** 140 * Convert the given object to the given type. 141 * 142 * @param obj object to be converted 143 * @param type destination type to convert to 144 * @return converted object 145 */ 146 public static Object convert(final Object obj, final Object type) { 147 if (obj == null) { 148 return null; 149 } 150 151 final Class<?> clazz; 152 if (type instanceof Class) { 153 clazz = (Class<?>)type; 154 } else if (type instanceof StaticClass) { 155 clazz = ((StaticClass)type).getRepresentedClass(); 156 } else { 157 throw new IllegalArgumentException("type expected"); 158 } 159 160 final LinkerServices linker = Bootstrap.getLinkerServices(); 161 final MethodHandle converter = linker.getTypeConverter(obj.getClass(), clazz); 162 if (converter == null) { 163 // no supported conversion! 164 throw new UnsupportedOperationException("conversion not supported"); 165 } 166 167 try { 168 return converter.invoke(obj); 169 } catch (final RuntimeException | Error e) { 170 throw e; 171 } catch (final Throwable t) { 172 throw new RuntimeException(t); 173 } 174 } 175 }