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# value.h

    00001 // -*- c-basic-offset: 2 -*-
    00002 /*
    00003  *  This file is part of the KDE libraries
    00004  *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
    00005  *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
    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 License
    00018  *  along with this library; see the file COPYING.LIB.  If not, write to
    00019  *  the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00020  *  Boston, MA 02111-1307, USA.
    00021  *
    00022  */
    00023
    00024 #ifndef _KJS_VALUE_H_
    00025 #define _KJS_VALUE_H_
    00026
    00027 #include <stdlib.h> // Needed for size_t
    00028
    00029 #include "ustring.h"
    00030 #include <kjs/global.h>
    00031
    00032 // Primitive data types
    00033
    00034 namespace KJS {
    00035
    00036   class Value;
    00037   class ValueImp;
    00038   class ValueImpPrivate;
    00039   class Undefined;
    00040   class UndefinedImp;
    00041   class Null;
    00042   class NullImp;
    00043   class Boolean;
    00044   class BooleanImp;
    00045   class String;
    00046   class StringImp;
    00047   class Number;
    00048   class NumberImp;
    00049   class Object;
    00050   class ObjectImp;
    00051   class Reference;
    00052   class ReferenceImp;
    00053   class List;
    00054   class ListImp;
    00055   class Completion;
    00056   class CompletionImp;
    00057   class ExecState;
    00058
    00062   enum Type {
    00063     UnspecifiedType = 0,
    00064     UndefinedType   = 1,
    00065     NullType        = 2,
    00066     BooleanType     = 3,
    00067     StringType      = 4,
    00068     NumberType      = 5,
    00069     ObjectType      = 6,
    00070     ReferenceType   = 7,
    00071     ListType        = 8,
    00072     CompletionType  = 9
    00073   };
    00074
    00083   class ValueImp {
    00084     friend class Collector;
    00085   public:
    00086     ValueImp();
    00087     virtual ~ValueImp();
    00088
    00089     inline ValueImp* ref() { refcount++; return this; }
    00090     inline bool deref() { return (!--refcount); }
    00091     unsigned int refcount;
    00092
    00093     virtual void mark();
    00094     bool marked() const;
    00095     void* operator new(size_t);
    00096     void operator delete(void*);
    00097
    00103     void setGcAllowed(); // TODO: inline, remove function below
    00104     void inlinedSetGcAllowed() { _flags |= VI_GCALLOWED; }
    00105
    00106     virtual Type type() const = 0;
    00107
    00108     // The conversion operations
    00109
    00110     virtual Value toPrimitive(ExecState *exec,
    00111                               Type preferredType = UnspecifiedType) const = 0;
    00112     virtual bool toBoolean(ExecState *exec) const = 0;
    00113     virtual double toNumber(ExecState *exec) const = 0;
    00114     // TODO: no need for the following 4 int conversions to be virtual
    00115     virtual int toInteger(ExecState *exec) const;
    00116     virtual int toInt32(ExecState *exec) const;
    00117     virtual unsigned int toUInt32(ExecState *exec) const;
    00118     virtual unsigned short toUInt16(ExecState *exec) const;
    00119     virtual UString toString(ExecState *exec) const = 0;
    00120     virtual Object toObject(ExecState *exec) const = 0;
    00121
    00122     // Reference operations
    00123
    00124     virtual Value getBase(ExecState *exec) const;
    00125     virtual UString getPropertyName(ExecState *exec) const;
    00126     virtual Value getValue(ExecState *exec) const;
    00127     virtual void putValue(ExecState *exec, const Value w);
    00128
    00129   private:
    00130     enum {
    00131       VI_MARKED = 1,
    00132       VI_GCALLOWED = 2,
    00133       VI_CREATED = 4,
    00134       VI_DESTRUCTED = 8
    00135     }; // VI means VALUEIMPL
    00136
    00137     ValueImpPrivate *_vd;
    00138     unsigned int _flags;
    00139   };
    00140
    00156   class Value {
    00157   public:
    00158     Value();
    00159     explicit Value(ValueImp *v);
    00160     Value(const Value &v) { if ((rep = v.rep)) rep->ref(); }
    00161     ~Value() { if (rep) rep->deref(); }
    00162
    00163     Value& operator=(const Value &v);
    00170     bool isValid() const;
    00175     bool isNull() const;
    00176     ValueImp *imp() const;
    00177
    00185     Type type() const;
    00186
    00193     bool isA(Type t) const;
    00194
    00199     Value toPrimitive(ExecState *exec,
    00200                       Type preferredType = UnspecifiedType) const;
    00201
    00205     bool toBoolean(ExecState *exec) const;
    00206
    00210     double toNumber(ExecState *exec) const;
    00211
    00215     int toInteger(ExecState *exec) const;
    00216
    00220     int toInt32(ExecState *exec) const;
    00221
    00225     unsigned int toUInt32(ExecState *exec) const;
    00226
    00230     unsigned short toUInt16(ExecState *exec) const;
    00231
    00235     UString toString(ExecState *exec) const;
    00236
    00240     Object toObject(ExecState *exec) const;
    00241
    00248     Value getBase(ExecState *exec) const;
    00249
    00254     UString getPropertyName(ExecState *exec) const;
    00255
    00260     Value getValue(ExecState *exec) const;
    00261
    00266     void putValue(ExecState *exec, const Value w);
    00267
    00268   protected:
    00269     ValueImp *rep;
    00270   };
    00271
    00272   bool operator==(const Value &v1, const Value &v2);
    00273   bool operator!=(const Value &v1, const Value &v2);
    00274
    00275   // Primitive types
    00276
    00282   class Undefined : public Value {
    00283   public:
    00284     Undefined();
    00285     Undefined(const Undefined &v);
    00286     virtual ~Undefined();
    00287
    00288     Undefined& operator=(const Undefined &v);
    00289
    00299     static Undefined dynamicCast(const Value &v);
    00300   private:
    00301     friend class UndefinedImp;
    00302     explicit Undefined(UndefinedImp *v);
    00303
    00304   };
    00305
    00311   class Null : public Value {
    00312   public:
    00313     Null();
    00314     Null(const Null &v);
    00315     virtual ~Null();
    00316
    00317     Null& operator=(const Null &v);
    00318
    00328     static Null dynamicCast(const Value &v);
    00329   private:
    00330     friend class NullImp;
    00331     explicit Null(NullImp *v);
    00332   };
    00333
    00337   class Boolean : public Value {
    00338   public:
    00339     Boolean(bool b = false);
    00340     Boolean(const Boolean &v);
    00341     virtual ~Boolean();
    00342
    00343     Boolean& operator=(const Boolean &v);
    00344
    00354     static Boolean dynamicCast(const Value &v);
    00355
    00356     bool value() const;
    00357   private:
    00358     friend class BooleanImp;
    00359     explicit Boolean(BooleanImp *v);
    00360   };
    00361
    00365   class String : public Value {
    00366   public:
    00367     String(const UString &s = "");
    00368     String(const String &v);
    00369     virtual ~String();
    00370
    00371     String& operator=(const String &v);
    00372
    00382     static String dynamicCast(const Value &v);
    00383
    00384     UString value() const;
    00385   private:
    00386     friend class StringImp;
    00387     explicit String(StringImp *v);
    00388   };
    00389
    00390   extern const double NaN;
    00391   extern const double Inf;
    00392
    00396   class Number : public Value {
    00397   public:
    00398     Number(int i);
    00399     Number(unsigned int u);
    00400     Number(double d = 0.0);
    00401     Number(long int l);
    00402     Number(long unsigned int l);
    00403     Number(const Number &v);
    00404     virtual ~Number();
    00405
    00406     Number& operator=(const Number &v);
    00407
    00408     double value() const;
    00409     int intValue() const;
    00410
    00411     bool isNaN() const;
    00412     bool isInf() const;
    00413
    00423     static Number dynamicCast(const Value &v);
    00424   private:
    00425     friend class NumberImp;
    00426     explicit Number(NumberImp *v);
    00427   };
    00428
    00429 } // namespace
    00430
    00431 #endif // _KJS_VALUE_H_

This file is part of the documentation for kdelibs Version 3.1.5.
Documentation copyright © 1996-2002 the KDE developers.
Generated on Wed Jan 28 13:08:38 2004 by doxygen 1.3.4 written by Dimitri van Heesch, © 1997-2001