| /* |
| * 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.internal.runtime; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.util.Iterator; |
| import java.util.concurrent.Callable; |
| import jdk.nashorn.internal.ir.LiteralNode; |
| import jdk.nashorn.internal.ir.Node; |
| import jdk.nashorn.internal.ir.ObjectNode; |
| import jdk.nashorn.internal.ir.PropertyNode; |
| import jdk.nashorn.internal.ir.UnaryNode; |
| import jdk.nashorn.internal.objects.Global; |
| import jdk.nashorn.internal.parser.JSONParser; |
| import jdk.nashorn.internal.parser.TokenType; |
| import jdk.nashorn.internal.runtime.arrays.ArrayIndex; |
| import jdk.nashorn.internal.runtime.linker.Bootstrap; |
| |
| /** |
| * Utilities used by "JSON" object implementation. |
| */ |
| public final class JSONFunctions { |
| private JSONFunctions() {} |
| |
| private static final Object REVIVER_INVOKER = new Object(); |
| |
| private static MethodHandle getREVIVER_INVOKER() { |
| return Context.getGlobal().getDynamicInvoker(REVIVER_INVOKER, |
| new Callable<MethodHandle>() { |
| @Override |
| public MethodHandle call() { |
| return Bootstrap.createDynamicInvoker("dyn:call", Object.class, |
| ScriptFunction.class, ScriptObject.class, String.class, Object.class); |
| } |
| }); |
| } |
| |
| /** |
| * Returns JSON-compatible quoted version of the given string. |
| * |
| * @param str String to be quoted |
| * @return JSON-compatible quoted string |
| */ |
| public static String quote(final String str) { |
| return JSONParser.quote(str); |
| } |
| |
| /** |
| * Parses the given JSON text string and returns object representation. |
| * |
| * @param text JSON text to be parsed |
| * @param reviver optional value: function that takes two parameters (key, value) |
| * @return Object representation of JSON text given |
| */ |
| public static Object parse(final Object text, final Object reviver) { |
| final String str = JSType.toString(text); |
| final JSONParser parser = new JSONParser( |
| new Source("<json>", str), |
| new Context.ThrowErrorManager()); |
| |
| Node node; |
| |
| try { |
| node = parser.parse(); |
| } catch (final ParserException e) { |
| throw ECMAErrors.syntaxError(e, "invalid.json", e.getMessage()); |
| } |
| |
| final Global global = Context.getGlobal(); |
| Object unfiltered = convertNode(global, node); |
| return applyReviver(global, unfiltered, reviver); |
| } |
| |
| // -- Internals only below this point |
| |
| // parse helpers |
| |
| // apply 'reviver' function if available |
| private static Object applyReviver(final Global global, final Object unfiltered, final Object reviver) { |
| if (reviver instanceof ScriptFunction) { |
| final ScriptObject root = global.newObject(); |
| root.addOwnProperty("", Property.WRITABLE_ENUMERABLE_CONFIGURABLE, unfiltered); |
| return walk(root, "", (ScriptFunction)reviver); |
| } |
| return unfiltered; |
| } |
| |
| // This is the abstract "Walk" operation from the spec. |
| private static Object walk(final ScriptObject holder, final Object name, final ScriptFunction reviver) { |
| final Object val = holder.get(name); |
| if (val instanceof ScriptObject) { |
| final ScriptObject valueObj = (ScriptObject)val; |
| final Iterator<String> iter = valueObj.propertyIterator(); |
| |
| while (iter.hasNext()) { |
| final String key = iter.next(); |
| final Object newElement = walk(valueObj, key, reviver); |
| |
| if (newElement == ScriptRuntime.UNDEFINED) { |
| valueObj.delete(key, false); |
| } else { |
| setPropertyValue(valueObj, key, newElement, false); |
| } |
| } |
| } |
| |
| try { |
| // Object.class, ScriptFunction.class, ScriptObject.class, String.class, Object.class); |
| return getREVIVER_INVOKER().invokeExact(reviver, holder, JSType.toString(name), val); |
| } catch(Error|RuntimeException t) { |
| throw t; |
| } catch(final Throwable t) { |
| throw new RuntimeException(t); |
| } |
| } |
| |
| // Converts IR node to runtime value |
| private static Object convertNode(final Global global, final Node node) { |
| assert global instanceof Global; |
| |
| if (node instanceof LiteralNode) { |
| // check for array literal |
| if (node.tokenType() == TokenType.ARRAY) { |
| assert node instanceof LiteralNode.ArrayLiteralNode; |
| final Node[] elements = ((LiteralNode.ArrayLiteralNode)node).getValue(); |
| |
| // NOTE: We cannot use LiteralNode.isNumericArray() here as that |
| // method uses symbols of element nodes. Since we don't do lower |
| // pass, there won't be any symbols! |
| if (isNumericArray(elements)) { |
| final double[] values = new double[elements.length]; |
| int index = 0; |
| |
| for (final Node elem : elements) { |
| values[index++] = JSType.toNumber(convertNode(global, elem)); |
| } |
| return global.wrapAsObject(values); |
| } |
| |
| final Object[] values = new Object[elements.length]; |
| int index = 0; |
| |
| for (final Node elem : elements) { |
| values[index++] = convertNode(global, elem); |
| } |
| |
| return global.wrapAsObject(values); |
| } |
| |
| return ((LiteralNode<?>)node).getValue(); |
| |
| } else if (node instanceof ObjectNode) { |
| final ObjectNode objNode = (ObjectNode) node; |
| final ScriptObject object = global.newObject(); |
| |
| for (final PropertyNode pNode: objNode.getElements()) { |
| final Node valueNode = pNode.getValue(); |
| |
| final String name = pNode.getKeyName(); |
| final Object value = convertNode(global, valueNode); |
| setPropertyValue(object, name, value, false); |
| } |
| |
| return object; |
| } else if (node instanceof UnaryNode) { |
| // UnaryNode used only to represent negative number JSON value |
| final UnaryNode unaryNode = (UnaryNode)node; |
| return -((LiteralNode<?>)unaryNode.rhs()).getNumber(); |
| } else { |
| return null; |
| } |
| } |
| |
| // add a new property if does not exist already, or else set old property |
| private static void setPropertyValue(final ScriptObject sobj, final String name, final Object value, final boolean strict) { |
| final int index = ArrayIndex.getArrayIndex(name); |
| if (ArrayIndex.isValidArrayIndex(index)) { |
| // array index key |
| sobj.defineOwnProperty(index, value); |
| } else if (sobj.getMap().findProperty(name) != null) { |
| // pre-existing non-inherited property, call set |
| sobj.set(name, value, strict); |
| } else { |
| // add new property |
| sobj.addOwnProperty(name, Property.WRITABLE_ENUMERABLE_CONFIGURABLE, value); |
| } |
| } |
| |
| // does the given IR node represent a numeric array? |
| private static boolean isNumericArray(final Node[] values) { |
| for (final Node node : values) { |
| if (node instanceof LiteralNode && ((LiteralNode<?>)node).getValue() instanceof Number) { |
| continue; |
| } |
| return false; |
| } |
| return true; |
| } |
| } |