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/*
* 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 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.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 MethodHandle REVIVER_INVOKER = 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 ScriptObject global = Context.getGlobalTrusted();
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 ScriptObject global, final Object unfiltered, final Object reviver) {
if (reviver instanceof ScriptFunction) {
assert global instanceof GlobalObject;
final ScriptObject root = ((GlobalObject)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 REVIVER_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 ScriptObject global, final Node node) {
assert global instanceof GlobalObject;
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 ((GlobalObject)global).wrapAsObject(values);
}
final Object[] values = new Object[elements.length];
int index = 0;
for (final Node elem : elements) {
values[index++] = convertNode(global, elem);
}
return ((GlobalObject)global).wrapAsObject(values);
}
return ((LiteralNode<?>)node).getValue();
} else if (node instanceof ObjectNode) {
final ObjectNode objNode = (ObjectNode) node;
final ScriptObject object = ((GlobalObject)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;
}
}
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