bool_object.cpp

来自「konqueror3 embedded版本, KDE环境下的当家浏览器的嵌入式版」· C++ 代码 · 共 147 行

// -*- c-basic-offset: 2 -*-
/*
 *  This file is part of the KDE libraries
 *  Copyright (C) 1999-2000 Harri Porten ([e-mail])
 *  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 "value.h"
#include "object.h"
#include "types.h"
#include "interpreter.h"
#include "operations.h"
#include "bool_object.h"
#include "error_object.h"
#include "lookup.h"

#include <assert.h>

using namespace KJS;

// ------------------------------ BooleanInstanceImp ---------------------------

const ClassInfo BooleanInstanceImp::info = {"Boolean", 0, 0, 0};

BooleanInstanceImp::BooleanInstanceImp(ObjectImp *proto)
  : ObjectImp(proto)
{
}

// ------------------------------ BooleanPrototypeImp --------------------------

// ECMA 15.6.4

BooleanPrototypeImp::BooleanPrototypeImp(ExecState *exec,
                                         ObjectPrototypeImp *objectProto,
                                         FunctionPrototypeImp *funcProto)
  : BooleanInstanceImp(objectProto)
{
  Value protect(this);
  // The constructor will be added later by InterpreterImp::InterpreterImp()

  putDirect(toStringPropertyName, new BooleanProtoFuncImp(exec,funcProto,BooleanProtoFuncImp::ToString,0,toStringPropertyName), DontEnum);
  putDirect(valueOfPropertyName, new BooleanProtoFuncImp(exec,funcProto,BooleanProtoFuncImp::ValueOf,0,valueOfPropertyName),  DontEnum);
  setInternalValue(Boolean(false));
}


// ------------------------------ BooleanProtoFuncImp --------------------------

BooleanProtoFuncImp::BooleanProtoFuncImp(ExecState * /*exec*/,
                                         FunctionPrototypeImp *funcProto, int i, int len, const Identifier &_ident)
  : InternalFunctionImp(funcProto), id(i)
{
  Value protect(this);
  putDirect(lengthPropertyName, len, DontDelete|ReadOnly|DontEnum);
  ident = _ident;
}


bool BooleanProtoFuncImp::implementsCall() const
{
  return true;
}


// ECMA 15.6.4.2 + 15.6.4.3
Value BooleanProtoFuncImp::call(ExecState *exec, Object &thisObj, const List &/*args*/)
{
  // no generic function. "this" has to be a Boolean object
  KJS_CHECK_THIS( BooleanInstanceImp, thisObj );

  // execute "toString()" or "valueOf()", respectively

  Value v = thisObj.internalValue();
  assert(v.isValid());

  if (id == ToString)
    return String(v.toString(exec));
  return Boolean(v.toBoolean(exec)); /* TODO: optimize for bool case */
}

// ------------------------------ BooleanObjectImp -----------------------------


BooleanObjectImp::BooleanObjectImp(ExecState * /*exec*/, FunctionPrototypeImp *funcProto,
                                   BooleanPrototypeImp *booleanProto)
  : InternalFunctionImp(funcProto)
{
  Value protect(this);
  putDirect(prototypePropertyName, booleanProto, DontEnum|DontDelete|ReadOnly);

  // no. of arguments for constructor
  putDirect(lengthPropertyName, NumberImp::one(), ReadOnly|DontDelete|DontEnum);
}


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

// ECMA 15.6.2
Object BooleanObjectImp::construct(ExecState *exec, const List &args)
{
  Object obj(new BooleanInstanceImp(exec->lexicalInterpreter()->builtinBooleanPrototype().imp()));

  Boolean b;
  if (args.size() > 0)
    b = args.begin()->dispatchToBoolean(exec);
  else
    b = Boolean(false);

  obj.setInternalValue(b);

  return obj;
}

bool BooleanObjectImp::implementsCall() const
{
  return true;
}

// ECMA 15.6.1
Value BooleanObjectImp::call(ExecState *exec, Object &/*thisObj*/, const List &args)
{
  if (args.isEmpty())
    return Boolean(false);
  else
    return Boolean(args[0].toBoolean(exec)); /* TODO: optimize for bool case */
}