garray.h

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */


// 
// Warning:  This is a C++ file.  
//
//
// This implements cross platform Growable arrays of Pointers.
//
#ifndef _GARRAY_H_
#define _GARRAY_H_

//
//    On Unix (well at least Solaris) we are having troubles with
//    templates, so hey, we won't use them...djw.
//
//    On Mac we are having troubles as well, so add me to the list.
//    Now, why even have templates?...jar
//
#if ! ( defined(XP_WIN16) || defined(XP_UNIX) || defined(XP_MAC) )
#define TEMPLATE_SUPPORT    1
#endif

#include "prtypes.h"

class CXP_GrowableArray {
protected:
    void **m_pData;
    int m_iSize;
    int m_iAllocSize;

    int NewSize( int iMinSize){
        int iNewSize = MAX( m_iAllocSize,16) ;
        while( iNewSize < iMinSize ){
            iNewSize = iNewSize+iNewSize;
        }
        return iNewSize;
    }

    //
    // this is the routine that does the actual work.  Should be in 
    //  its own file.
    //
    void GuaranteeSize(int iSize){ 
        if(m_iAllocSize <= iSize){
            int iNewSize = NewSize( iSize );
            if( m_iAllocSize ){
                void ** pNewData = new void*[iNewSize];
                XP_BCOPY( m_pData, pNewData, m_iAllocSize * sizeof(void*) );
                delete [] m_pData;
                m_pData = pNewData;
            }
            else{
                m_pData = new void*[iNewSize];
            }
            m_iAllocSize = iNewSize;
        } 
    }

public:
    CXP_GrowableArray(int iStartSize=0): m_pData(0),m_iSize(0),m_iAllocSize(0){ 
        if( iStartSize ){
            GuaranteeSize( iStartSize );
        }
    };

    ~CXP_GrowableArray(){ delete [] m_pData; }

    int Size(){ return m_iSize; }

    void SetSize( int iSize ){ 
        GuaranteeSize( iSize );
        m_iSize = iSize;
    }

    void* operator[](int nIndex) const { return m_pData[nIndex]; }
    void*& operator[](int nIndex){ return m_pData[nIndex]; }

    int Add(void* newElement){ 
        GuaranteeSize(m_iSize+1);
        m_pData[m_iSize] = newElement;
        /* Return index to last item in list */
        return m_iSize++;
    }

    int Insert(void* newElement, int nIndex){
        intn iLowerLimit;
        GuaranteeSize(m_iSize+1);

        if( nIndex < 0 )
            nIndex = 0;

        if( nIndex < m_iSize )
        {
            iLowerLimit = PR_MAX(1, nIndex);
            /* Shuffle pointers at and above insert index up */
            for( int i = m_iSize; i >= iLowerLimit; i-- )
            {
                m_pData[i] = m_pData[i-1];
            }
            /* Overwrite pointer at designated location */
            m_pData[nIndex] = newElement;        
        } else {
            /* nIndex is too large - just add at end */
            m_pData[m_iSize] = newElement;
        }
        /* Return index to last item in list */
        return m_iSize++;
    }

    int Delete( int nIndex ){ 
        if( nIndex < m_iSize )
        {
            /* Shuffle remaining pointers down */
            for( int i = nIndex; i < m_iSize-1; i++ )
            {
               m_pData[i] = m_pData[i+1];
            }
            m_iSize--;
        }
        /* Return index to last item in list */
        return (m_iSize-1);
    }

    int Delete( void* element ){ 
        for( int i = 0; i < m_iSize; i++ )
        {
            if( m_pData[i] == element )
            {
                return Delete(i);
            }
        }
        return (m_iSize-1);
    }

    int Find( void* element ){ 
        for( int i = 0; i < m_iSize; i++ )
        {
            if( m_pData[i] == element )
            {
                return i;
            }
        }
        return -1;
    }

    void Empty(){
        m_iSize = 0;
    }
};

class CXP_PtrStack : public CXP_GrowableArray{
public:
    int m_iTop;
    CXP_PtrStack(): m_iTop(-1){}
    Bool IsEmpty(){ return m_iTop == -1; }
    void Push( void* t ){ 
        if( ++m_iTop >= Size() ) {
            Add( t );
        }
        else {
            (*this)[m_iTop] = t;
        }
    }
    void* Top(){ return (*this)[m_iTop]; }
    void* Pop(){ return (*this)[m_iTop--];}
    void Reset(){ m_iTop = -1; }
    int StackSize() { return m_iTop + 1; }
};

#ifdef TEMPLATE_SUPPORT

template<class PTRTYPE>
class TXP_GrowableArray: public CXP_GrowableArray {
public:
    PTRTYPE operator[](int nIndex) const { return (PTRTYPE)(int32)m_pData[nIndex]; }
    PTRTYPE& operator[](int nIndex){ return *(PTRTYPE*)&m_pData[nIndex]; }
    int Add(PTRTYPE newElement){ return CXP_GrowableArray::Add( (void*) newElement ); }
};

#define Declare_GrowableArray(NAME,PTRTYPE) \
    typedef TXP_GrowableArray<PTRTYPE> TXP_GrowableArray_##NAME;

#else

#define Declare_GrowableArray(NAME,PTRTYPE)                                 \
    class TXP_GrowableArray_##NAME: public CXP_GrowableArray {                          \
    public:                                                                             \
        PTRTYPE operator[](int nIndex) const { return (PTRTYPE)(int32)m_pData[nIndex]; }\
        PTRTYPE& operator[](int nIndex){ return *(PTRTYPE*)&m_pData[nIndex]; }          \
        int Add(PTRTYPE newElement){ return CXP_GrowableArray::Add( (void*) newElement ); } \
    };                                                                                 \


#endif

//
// PtrStack Imlementation
//
#ifdef TEMPLATE_SUPPORT
template<class PTRTYPE>
class TXP_PtrStack : public TXP_GrowableArray<PTRTYPE> {
public:
    int m_iTop;
    TXP_PtrStack(): m_iTop(-1){}
    Bool IsEmpty(){ return m_iTop == -1; }
    void Push( PTRTYPE t ){ 
        if( ++m_iTop >= Size() ) {
            Add( t );
        }
        else {
            (*this)[m_iTop] = t;
        }
    }
    PTRTYPE Top(){ return (*this)[m_iTop]; }
    PTRTYPE Pop(){ return (*this)[m_iTop--];}
    void Reset(){ m_iTop = -1; }
    int StackSize(){ return m_iTop + 1; }
};

#define Declare_PtrStack(NAME,PTRTYPE) \
    typedef TXP_PtrStack<PTRTYPE> TXP_PtrStack_##NAME;

#else // No template support

#define Declare_PtrStack(NAME, PTRTYPE) \
    class TXP_PtrStack_##NAME : public CXP_PtrStack {                   \
    public:                                                             \
        void Push( PTRTYPE t ){ CXP_PtrStack::Push((void*)(int32)t); }  \
        PTRTYPE Top(){ return (PTRTYPE)(int32)CXP_PtrStack::Top(); }    \
        PTRTYPE Pop(){ return (PTRTYPE)(int32)CXP_PtrStack::Pop(); }    \
        PTRTYPE operator[](int nIndex) const { return (PTRTYPE)(int32)m_pData[nIndex]; }\
        PTRTYPE& operator[](int nIndex){ return *(PTRTYPE*)&m_pData[nIndex]; }          \
        int Add(PTRTYPE newElement){ return CXP_GrowableArray::Add( (void*)(int32)newElement ); } \
    };                                                                  \


#endif

#endif