error_object.cpp   [plain text]

// -*- c-basic-offset: 2 -*-
/*
 *  This file is part of the KDE libraries
 *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
 *  Copyright (C) 2003 Apple Computer, Inc.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include "config.h"
#include "value.h"
#include "object.h"
#include "types.h"
#include "interpreter.h"
#include "operations.h"
#include "error_object.h"
//#include "debugger.h"

using namespace KJS;

// ------------------------------ ErrorInstance ----------------------------

const ClassInfo ErrorInstance::info = {"Error", 0, 0, 0};

ErrorInstance::ErrorInstance(JSObject *proto)
: JSObject(proto)
{
}

// ------------------------------ ErrorPrototype ----------------------------

// ECMA 15.9.4
ErrorPrototype::ErrorPrototype(ExecState *exec,
                                     ObjectPrototype *objectProto,
                                     FunctionPrototype *funcProto)
  : JSObject(objectProto)
{
  setInternalValue(jsUndefined());
  // The constructor will be added later in ErrorObjectImp's constructor

  put(exec, namePropertyName,     jsString("Error"), DontEnum);
  put(exec, messagePropertyName,  jsString("Unknown error"), DontEnum);
  putDirectFunction(new ErrorProtoFunc(exec, funcProto, toStringPropertyName), DontEnum);
}

// ------------------------------ ErrorProtoFunc ----------------------------

ErrorProtoFunc::ErrorProtoFunc(ExecState*, FunctionPrototype* funcProto, const Identifier& name)
  : InternalFunctionImp(funcProto, name)
{
  putDirect(lengthPropertyName, jsNumber(0), DontDelete|ReadOnly|DontEnum);
}

JSValue *ErrorProtoFunc::callAsFunction(ExecState *exec, JSObject *thisObj, const List &/*args*/)
{
  // toString()
  UString s = "Error";

  JSValue *v = thisObj->get(exec, namePropertyName);
  if (!v->isUndefined()) {
    s = v->toString(exec);
  }

  v = thisObj->get(exec, messagePropertyName);
  if (!v->isUndefined()) {
    s += ": " + v->toString(exec); // Mozilla compatible format
  }

  return jsString(s);
}

// ------------------------------ ErrorObjectImp -------------------------------

ErrorObjectImp::ErrorObjectImp(ExecState*, FunctionPrototype* funcProto, ErrorPrototype* errorProto)
  : InternalFunctionImp(funcProto)
{
  // ECMA 15.11.3.1 Error.prototype
  putDirect(prototypePropertyName, errorProto, DontEnum|DontDelete|ReadOnly);
  putDirect(lengthPropertyName, jsNumber(1), DontDelete|ReadOnly|DontEnum);
  //putDirect(namePropertyName, jsString(n));
}

bool ErrorObjectImp::implementsConstruct() const
{
  return true;
}

// ECMA 15.9.3
JSObject *ErrorObjectImp::construct(ExecState *exec, const List &args)
{
  JSObject *proto = static_cast<JSObject *>(exec->lexicalInterpreter()->builtinErrorPrototype());
  JSObject *imp = new ErrorInstance(proto);
  JSObject *obj(imp);

  if (!args[0]->isUndefined())
    imp->putDirect(messagePropertyName, jsString(args[0]->toString(exec)));

  return obj;
}

// ECMA 15.9.2
JSValue *ErrorObjectImp::callAsFunction(ExecState *exec, JSObject */*thisObj*/, const List &args)
{
  // "Error()" gives the sames result as "new Error()"
  return construct(exec,args);
}

// ------------------------------ NativeErrorPrototype ----------------------

NativeErrorPrototype::NativeErrorPrototype(ExecState*, ErrorPrototype* errorProto, ErrorType et, UString name, UString message)
  : JSObject(errorProto)
{
  errType = et;
  putDirect(namePropertyName, jsString(name), 0);
  putDirect(messagePropertyName, jsString(message), 0);
}

// ------------------------------ NativeErrorImp -------------------------------

const ClassInfo NativeErrorImp::info = {"Function", &InternalFunctionImp::info, 0, 0};

NativeErrorImp::NativeErrorImp(ExecState*, FunctionPrototype* funcProto, JSObject* prot)
  : InternalFunctionImp(funcProto)
  , proto(prot)
{
  putDirect(lengthPropertyName, jsNumber(1), DontDelete|ReadOnly|DontEnum); // ECMA 15.11.7.5
  putDirect(prototypePropertyName, proto, DontDelete|ReadOnly|DontEnum);
}

bool NativeErrorImp::implementsConstruct() const
{
  return true;
}

JSObject *NativeErrorImp::construct(ExecState *exec, const List &args)
{
  JSObject *imp = new ErrorInstance(proto);
  JSObject *obj(imp);
  if (!args[0]->isUndefined())
    imp->putDirect(messagePropertyName, jsString(args[0]->toString(exec)));
  return obj;
}

JSValue *NativeErrorImp::callAsFunction(ExecState *exec, JSObject */*thisObj*/, const List &args)
{
  return construct(exec,args);
}

void NativeErrorImp::mark()
{
  JSObject::mark();
  if (proto && !proto->marked())
    proto->mark();
}