bool_object.cpp

00001 // -*- c-basic-offset: 2 -*-
00002 /*
00003  *  This file is part of the KDE libraries
00004  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
00005  *  Copyright (C) 2003 Apple Computer, Inc.
00006  *
00007  *  This library is free software; you can redistribute it and/or
00008  *  modify it under the terms of the GNU Lesser General Public
00009  *  License as published by the Free Software Foundation; either
00010  *  version 2 of the License, or (at your option) any later version.
00011  *
00012  *  This library is distributed in the hope that it will be useful,
00013  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  *  Lesser General Public License for more details.
00016  *
00017  *  You should have received a copy of the GNU Lesser General Public
00018  *  License along with this library; if not, write to the Free Software
00019  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
00020  *
00021  */
00022 
00023 #include "value.h"
00024 #include "object.h"
00025 #include "types.h"
00026 #include "interpreter.h"
00027 #include "operations.h"
00028 #include "bool_object.h"
00029 #include "error_object.h"
00030 #include "lookup.h"
00031 
00032 #include <assert.h>
00033 
00034 using namespace KJS;
00035 
00036 // ------------------------------ BooleanInstanceImp ---------------------------
00037 
00038 const ClassInfo BooleanInstanceImp::info = {"Boolean", 0, 0, 0};
00039 
00040 BooleanInstanceImp::BooleanInstanceImp(ObjectImp *proto)
00041   : ObjectImp(proto)
00042 {
00043 }
00044 
00045 // ------------------------------ BooleanPrototypeImp --------------------------
00046 
00047 // ECMA 15.6.4
00048 
00049 BooleanPrototypeImp::BooleanPrototypeImp(ExecState *exec,
00050                                          ObjectPrototypeImp *objectProto,
00051                                          FunctionPrototypeImp *funcProto)
00052   : BooleanInstanceImp(objectProto)
00053 {
00054   Value protect(this);
00055   // The constructor will be added later by InterpreterImp::InterpreterImp()
00056 
00057   putDirect(toStringPropertyName, new BooleanProtoFuncImp(exec,funcProto,BooleanProtoFuncImp::ToString,0,toStringPropertyName), DontEnum);
00058   putDirect(valueOfPropertyName, new BooleanProtoFuncImp(exec,funcProto,BooleanProtoFuncImp::ValueOf,0,valueOfPropertyName),  DontEnum);
00059   setInternalValue(Boolean(false));
00060 }
00061 
00062 
00063 // ------------------------------ BooleanProtoFuncImp --------------------------
00064 
00065 BooleanProtoFuncImp::BooleanProtoFuncImp(ExecState * /*exec*/,
00066                                          FunctionPrototypeImp *funcProto, int i, int len, const Identifier &_ident)
00067   : InternalFunctionImp(funcProto), id(i)
00068 {
00069   Value protect(this);
00070   putDirect(lengthPropertyName, len, DontDelete|ReadOnly|DontEnum);
00071   ident = _ident;
00072 }
00073 
00074 
00075 bool BooleanProtoFuncImp::implementsCall() const
00076 {
00077   return true;
00078 }
00079 
00080 
00081 // ECMA 15.6.4.2 + 15.6.4.3
00082 Value BooleanProtoFuncImp::call(ExecState *exec, Object &thisObj, const List &/*args*/)
00083 {
00084   // no generic function. "this" has to be a Boolean object
00085   KJS_CHECK_THIS( BooleanInstanceImp, thisObj );
00086 
00087   // execute "toString()" or "valueOf()", respectively
00088 
00089   Value v = thisObj.internalValue();
00090   assert(v.isValid());
00091 
00092   if (id == ToString)
00093     return String(v.toString(exec));
00094   return Boolean(v.toBoolean(exec)); /* TODO: optimize for bool case */
00095 }
00096 
00097 // ------------------------------ BooleanObjectImp -----------------------------
00098 
00099 
00100 BooleanObjectImp::BooleanObjectImp(ExecState * /*exec*/, FunctionPrototypeImp *funcProto,
00101                                    BooleanPrototypeImp *booleanProto)
00102   : InternalFunctionImp(funcProto)
00103 {
00104   Value protect(this);
00105   putDirect(prototypePropertyName, booleanProto, DontEnum|DontDelete|ReadOnly);
00106 
00107   // no. of arguments for constructor
00108   putDirect(lengthPropertyName, NumberImp::one(), ReadOnly|DontDelete|DontEnum);
00109 }
00110 
00111 
00112 bool BooleanObjectImp::implementsConstruct() const
00113 {
00114   return true;
00115 }
00116 
00117 // ECMA 15.6.2
00118 Object BooleanObjectImp::construct(ExecState *exec, const List &args)
00119 {
00120   Object obj(new BooleanInstanceImp(exec->lexicalInterpreter()->builtinBooleanPrototype().imp()));
00121 
00122   Boolean b;
00123   if (args.size() > 0)
00124     b = args.begin()->dispatchToBoolean(exec);
00125   else
00126     b = Boolean(false);
00127 
00128   obj.setInternalValue(b);
00129 
00130   return obj;
00131 }
00132 
00133 bool BooleanObjectImp::implementsCall() const
00134 {
00135   return true;
00136 }
00137 
00138 // ECMA 15.6.1
00139 Value BooleanObjectImp::call(ExecState *exec, Object &/*thisObj*/, const List &args)
00140 {
00141   if (args.isEmpty())
00142     return Boolean(false);
00143   else
00144     return Boolean(args[0].toBoolean(exec)); /* TODO: optimize for bool case */
00145 }
00146 
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