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Rhino is an open-source implementation of JavaScript written entirely in
Java. It is typically embedded into Java applications to provide
scripting to end users.
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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript;
/**
*
* The class of error objects
*
* ECMA 15.11
*/
final class NativeError extends IdScriptableObject
{
static final long serialVersionUID = -5338413581437645187L;
private static final Object ERROR_TAG = "Error";
private RhinoException stackProvider;
static void init(Scriptable scope, boolean sealed)
{
NativeError obj = new NativeError();
ScriptableObject.putProperty(obj, "name", "Error");
ScriptableObject.putProperty(obj, "message", "");
ScriptableObject.putProperty(obj, "fileName", "");
ScriptableObject.putProperty(obj, "lineNumber", Integer.valueOf(0));
obj.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
}
static NativeError make(Context cx, Scriptable scope,
IdFunctionObject ctorObj, Object[] args)
{
Scriptable proto = (Scriptable)(ctorObj.get("prototype", ctorObj));
NativeError obj = new NativeError();
obj.setPrototype(proto);
obj.setParentScope(scope);
int arglen = args.length;
if (arglen >= 1) {
ScriptableObject.putProperty(obj, "message",
ScriptRuntime.toString(args[0]));
if (arglen >= 2) {
ScriptableObject.putProperty(obj, "fileName", args[1]);
if (arglen >= 3) {
int line = ScriptRuntime.toInt32(args[2]);
ScriptableObject.putProperty(obj, "lineNumber",
Integer.valueOf(line));
}
}
}
return obj;
}
@Override
public String getClassName()
{
return "Error";
}
@Override
public String toString()
{
// According to spec, Error.prototype.toString() may return undefined.
Object toString = js_toString(this);
return toString instanceof String ? (String) toString : super.toString();
}
@Override
protected void initPrototypeId(int id)
{
String s;
int arity;
switch (id) {
case Id_constructor: arity=1; s="constructor"; break;
case Id_toString: arity=0; s="toString"; break;
case Id_toSource: arity=0; s="toSource"; break;
default: throw new IllegalArgumentException(String.valueOf(id));
}
initPrototypeMethod(ERROR_TAG, id, s, arity);
}
@Override
public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
Scriptable thisObj, Object[] args)
{
if (!f.hasTag(ERROR_TAG)) {
return super.execIdCall(f, cx, scope, thisObj, args);
}
int id = f.methodId();
switch (id) {
case Id_constructor:
return make(cx, scope, f, args);
case Id_toString:
return js_toString(thisObj);
case Id_toSource:
return js_toSource(cx, scope, thisObj);
}
throw new IllegalArgumentException(String.valueOf(id));
}
public void setStackProvider(RhinoException re) {
// We go some extra miles to make sure the stack property is only
// generated on demand, is cached after the first access, and is
// overwritable like an ordinary property. Hence this setup with
// the getter and setter below.
if (stackProvider == null) {
stackProvider = re;
try {
defineProperty("stack", null,
NativeError.class.getMethod("getStack"),
NativeError.class.getMethod("setStack", Object.class), 0);
} catch (NoSuchMethodException nsm) {
// should not happen
throw new RuntimeException(nsm);
}
}
}
public Object getStack() {
Object value = stackProvider == null ?
NOT_FOUND : stackProvider.getScriptStackTrace();
// We store the stack as local property both to cache it
// and to make the property writable
setStack(value);
return value;
}
public void setStack(Object value) {
if (stackProvider != null) {
stackProvider = null;
delete("stack");
}
put("stack", this, value);
}
private static Object js_toString(Scriptable thisObj) {
Object name = ScriptableObject.getProperty(thisObj, "name");
if (name == NOT_FOUND || name == Undefined.instance) {
name = "Error";
} else {
name = ScriptRuntime.toString(name);
}
Object msg = ScriptableObject.getProperty(thisObj, "message");
final Object result;
if (msg == NOT_FOUND || msg == Undefined.instance) {
result = Undefined.instance;
} else {
result = ((String) name) + ": " + ScriptRuntime.toString(msg);
}
return result;
}
private static String js_toSource(Context cx, Scriptable scope,
Scriptable thisObj)
{
// Emulation of SpiderMonkey behavior
Object name = ScriptableObject.getProperty(thisObj, "name");
Object message = ScriptableObject.getProperty(thisObj, "message");
Object fileName = ScriptableObject.getProperty(thisObj, "fileName");
Object lineNumber = ScriptableObject.getProperty(thisObj, "lineNumber");
StringBuffer sb = new StringBuffer();
sb.append("(new ");
if (name == NOT_FOUND) {
name = Undefined.instance;
}
sb.append(ScriptRuntime.toString(name));
sb.append("(");
if (message != NOT_FOUND
|| fileName != NOT_FOUND
|| lineNumber != NOT_FOUND)
{
if (message == NOT_FOUND) {
message = "";
}
sb.append(ScriptRuntime.uneval(cx, scope, message));
if (fileName != NOT_FOUND || lineNumber != NOT_FOUND) {
sb.append(", ");
if (fileName == NOT_FOUND) {
fileName = "";
}
sb.append(ScriptRuntime.uneval(cx, scope, fileName));
if (lineNumber != NOT_FOUND) {
int line = ScriptRuntime.toInt32(lineNumber);
if (line != 0) {
sb.append(", ");
sb.append(ScriptRuntime.toString(line));
}
}
}
}
sb.append("))");
return sb.toString();
}
private static String getString(Scriptable obj, String id)
{
Object value = ScriptableObject.getProperty(obj, id);
if (value == NOT_FOUND) return "";
return ScriptRuntime.toString(value);
}
@Override
protected int findPrototypeId(String s)
{
int id;
// #string_id_map#
// #generated# Last update: 2007-05-09 08:15:45 EDT
L0: { id = 0; String X = null; int c;
int s_length = s.length();
if (s_length==8) {
c=s.charAt(3);
if (c=='o') { X="toSource";id=Id_toSource; }
else if (c=='t') { X="toString";id=Id_toString; }
}
else if (s_length==11) { X="constructor";id=Id_constructor; }
if (X!=null && X!=s && !X.equals(s)) id = 0;
break L0;
}
// #/generated#
return id;
}
private static final int
Id_constructor = 1,
Id_toString = 2,
Id_toSource = 3,
MAX_PROTOTYPE_ID = 3;
// #/string_id_map#
}