/*
* 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.
*
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package jdk.nashorn.internal.runtime;
import java.lang.invoke.MethodHandle;
import java.util.concurrent.Callable;
import jdk.nashorn.internal.objects.Global;
import jdk.nashorn.internal.parser.JSONParser;
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.createDynamicCallInvoker(Object.class,
Object.class, Object.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 Global global = Context.getGlobal();
final boolean dualFields = ((ScriptObject) global).useDualFields();
final JSONParser parser = new JSONParser(str, global, dualFields);
final Object value;
try {
value = parser.parse();
} catch (final ParserException e) {
throw ECMAErrors.syntaxError(e, "invalid.json", e.getMessage());
}
return applyReviver(global, value, 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 (Bootstrap.isCallable(reviver)) {
final ScriptObject root = global.newObject();
root.addOwnProperty("", Property.WRITABLE_ENUMERABLE_CONFIGURABLE, unfiltered);
return walk(root, "", reviver);
}
return unfiltered;
}
// This is the abstract "Walk" operation from the spec.
private static Object walk(final ScriptObject holder, final Object name, final Object reviver) {
final Object val = holder.get(name);
if (val instanceof ScriptObject) {
final ScriptObject valueObj = (ScriptObject)val;
if (valueObj.isArray()) {
final int length = JSType.toInteger(valueObj.getLength());
for (int i = 0; i < length; i++) {
final String key = Integer.toString(i);
final Object newElement = walk(valueObj, key, reviver);
if (newElement == ScriptRuntime.UNDEFINED) {
valueObj.delete(i, false);
} else {
setPropertyValue(valueObj, key, newElement);
}
}
} else {
final String[] keys = valueObj.getOwnKeys(false);
for (final String key : keys) {
final Object newElement = walk(valueObj, key, reviver);
if (newElement == ScriptRuntime.UNDEFINED) {
valueObj.delete(key, false);
} else {
setPropertyValue(valueObj, key, newElement);
}
}
}
}
try {
// Object.class, ScriptFunction.class, ScriptObject.class, String.class, Object.class);
return getREVIVER_INVOKER().invokeExact(reviver, (Object)holder, JSType.toString(name), val);
} catch(Error|RuntimeException t) {
throw t;
} catch(final Throwable t) {
throw new RuntimeException(t);
}
}
// 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 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, 0);
} else {
// add new property
sobj.addOwnProperty(name, Property.WRITABLE_ENUMERABLE_CONFIGURABLE, value);
}
}
}