CWE-ou-minkata/Sources/Plasma/CoreLib/hsBiExpander.h

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*==LICENSE==*/

#ifndef hsBiExpander_inc
#define hsBiExpander_inc

#include "hsMemory.h"
#include "hsTemplates.h"

///////////////////////////////////////////////////////////////////////////////
////////////// Expander ///////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
template <class T> class hsExpander {
private:
    int32_t       fNumPost;
    int32_t       fNumPostAlloc;
    T*            fArray; 

    int32_t       fGrowBy; // default = 0, to double
    int32_t       fMinSize; // default = 1, min == 1

    int32_t       fCurrent;

    hsExpander(const hsExpander& x);                    // make it passed as ref or pointer

    void        IExpand(int newSize);
public:
    enum { kMissingIndex = -1 };

                hsExpander(int32_t minSize = 1, int32_t growBy = 0);
    virtual     ~hsExpander();

    hsExpander<T>& operator=(const hsExpander<T>&orig) { return Copy(orig); }
    hsExpander<T>& Copy(const hsExpander<T>& orig);

    void      SetCount(int cnt) { if( cnt >= fNumPostAlloc )IExpand(cnt); fNumPost = cnt; }
    int32_t   GetCount() const { return fNumPost; }
    bool      Empty() const { return GetCount() == 0; }
    const T&  Get(int32_t index) const;
    int32_t   Get(int32_t index, int32_t count, T data[]) const;
    int32_t   Find(const T&) const;   // returns kMissingIndex if not found

    void        SetArray(T* a, int32_t cnt);
    T*          GetArray() { return fArray; }
    T&          operator[]( int32_t index );
    int32_t     Append(const T&); // returns t's index
    T*          Append();
    int32_t     Push(const T& t) { return Append(t); }
    T*          Push() { return Append(); }
    T*          Top() { return fNumPost ? fArray + fNumPost-1 : nil; }
    int32_t     Pop(T* t); // returns count of remaining
    int32_t     Pop();
    void        Reset();    // clears out everything

    T&          Head() { return fArray[0]; }
    T&          Tail() { return fArray[fNumPost-1]; }
    T&          Current() { return fArray[fCurrent]; }
    void        First();
    void        Last();
    void        Plus() { ++fCurrent; }
    bool        More() { return (fCurrent < fNumPost); }
};

template <class T>
hsExpander<T>& hsExpander<T>::Copy(const hsExpander<T>& orig)
{
    SetCount(orig.GetCount());
    int i;
    for( i = 0; i < GetCount(); i++ )
        fArray[i] = orig.fArray[i];
    return *this;
}

template <class T>
void hsExpander<T>::SetArray(T* a, int32_t cnt)
{
    delete [] fArray;
    if( a )
        fArray = a;
    fNumPost = fNumPostAlloc = cnt;
}

template <class T>
void hsExpander<T>::IExpand(int newSize)
{
    int32_t newPostAlloc = fNumPostAlloc;
    if( !newPostAlloc )
        newPostAlloc++;
    while( newPostAlloc <= newSize )
        newPostAlloc = fGrowBy ? newPostAlloc + fGrowBy : newPostAlloc << 1;
    T* newArray = new T[newPostAlloc];
    int i;
    for( i = 0; i < fNumPost; i++ )
        newArray[i] = fArray[i];
    delete [] (fArray);
    fArray = newArray;
    fNumPostAlloc = newPostAlloc;
}

template <class T>
hsExpander<T>::hsExpander(int32_t minSize, int32_t growBy)
{
    hsThrowIfBadParam(minSize < 0);
    hsThrowIfBadParam(growBy < 0);

    fMinSize = minSize+1;
    fGrowBy = growBy;
    
    fArray  = new T[fMinSize];
    fNumPostAlloc = fMinSize;
    
    fNumPost = 0;
}

template <class T>
hsExpander<T>::~hsExpander()
{
    delete [] fArray;
}

template <class T> 
void hsExpander<T>::First()
{ 
    fCurrent = 0; 
}

template <class T> 
void hsExpander<T>::Last()
{ 
    fCurrent = fNumPost-1; 
}

template <class T> 
T& hsExpander<T>::operator[]( int32_t index )
{
    hsDebugCode(hsThrowIfBadParam((index < 0)||(index >= fNumPost));)

    return fArray[index];
}

template <class T> 
const T& hsExpander<T>::Get( int32_t index ) const
{
    hsDebugCode(hsThrowIfBadParam((index < 0)||(index >= fNumPost));)

    return fArray[index];
}

template <class T>
int32_t hsExpander<T>::Get(int32_t index, int32_t count, T data[]) const
{
    if( count > 0 )
    {   hsThrowIfNilParam(data);
        hsThrowIfBadParam((index < 0)||(index >= fNumPost));

        if (index + count > fNumPost)
            count = fNumPost - index;
        for (int i = 0; i < count; i++)
            data[i] = fArray[i + index];
    }
    return count;
}

template <class T>
int32_t hsExpander<T>::Find(const T& obj) const
{
    for (int i = 0; i < fNumPost; i++)
        if (fArray[i] == obj)
            return i;
    return kMissingIndex;
}

template <class T>
int32_t hsExpander<T>::Append(const T& obj)
{
    hsAssert(!(fNumPost >= fNumPostAlloc), "Must be less");
    if( fNumPost == fNumPostAlloc-1 )
        IExpand(fNumPostAlloc);
    fArray[fNumPost] = obj;
    return fNumPost++;
}

template <class T>
T* hsExpander<T>::Append()
{
    hsAssert(!(fNumPost >= fNumPostAlloc), "Must be less");
    if( fNumPost == fNumPostAlloc-1 )
        IExpand(fNumPostAlloc);
    return fArray + fNumPost++;
}

template <class T>
int32_t hsExpander<T>::Pop(T*t)
{
    hsThrowIfBadParam(Empty());
    --fNumPost;
    if( t )
        *t = fArray[fNumPost];
    return GetCount();
}

template <class T>
int32_t hsExpander<T>::Pop()
{
    hsThrowIfBadParam(Empty());
    --fNumPost;
    return GetCount();
}

template <class T>
void hsExpander<T>::Reset()
{
    fNumPost = 0;
}

///////////////////////////////////////////////////////////////////////////////
////////////// BiExpander /////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
template <class T> class hsBiExpander {
private:
    int32_t       fNumPre;
    int32_t       fNumPost;
    int32_t       fNumPreAlloc;
    int32_t       fNumPostAlloc;
    T*            fArray; 

    int32_t       fGrowBy; // default = 0, to double
    int32_t       fMinSize; // default = 1, min == 1

    int32_t       fCurrent;

    hsBiExpander<T>& operator=(const hsBiExpander<T>&);     // don't allow assignment
    hsBiExpander(const hsBiExpander<T>&);                   // make it passed as ref or pointer

    void        IExpand(int newSize, bool towardEnd = true);
public:
    enum { kMissingIndex = -1 };

                hsBiExpander(int32_t minSize = 1, int32_t growBy = 0);
    virtual     ~hsBiExpander();

    int32_t       GetFirst() const { return -fNumPre; }
    int32_t       GetCount() const { return fNumPre + fNumPost; }
    bool          Empty() const { return GetCount() == 0; }
    const T&      Get(int32_t index) const;
    int32_t       Get(int32_t index, int32_t count, T data[]) const;
    int32_t       Find(const T&) const;   // returns kMissingIndex if not found

    void          SetArray(T* a, int32_t cnt, int32_t numPre=0);
    T**           GetArray() { return fArray - fNumPre; }
    T&            operator[]( int32_t index );
    T*            Append(); // returns t's index
    T*            Push(); // returns t's index
    int32_t       Append(const T&); // returns t's index
    int32_t       Push(const T&); // returns t's index
    int32_t       Pop(T*t = nil) { return PopHead(t); } // returns count of remaining
    int32_t       PopHead(T*t = nil); // returns count of remaining
    int32_t       PopTail(T*t = nil); // returns count of remaining
    void          Reset();    // clears out everything

    T&          Head() { return fArray[-fNumPre]; }
    T&          Tail() { return fArray[fNumPost-1]; }
    T&          Current() { return fArray[fCurrent]; }
    void        First();
    void        Last();
    void        Plus() { ++fCurrent; }
    void        Minus() { --fCurrent; }
    bool        More() { return (fCurrent < fNumPost)&&(fCurrent >= -fNumPre); }
};

template <class T>
void hsBiExpander<T>::SetArray(T* a, int32_t cnt, int32_t numPre)
{
    if( !numPre )
        Reset();
    else
    {
        fNumPreAlloc = fNumPre = numPre;
        fNumPostAlloc = fNumPost = cnt - numPre;
        fArray = a + numPre;
    }
}

template <class T>
void hsBiExpander<T>::IExpand(int newSize, bool towardEnd)
{
    int32_t newPreAlloc = fNumPreAlloc;
    int32_t newPostAlloc = fNumPostAlloc;
    if( towardEnd )
    {
        if( !newPostAlloc )
            newPostAlloc++;
        while( newPostAlloc <= newSize )
            newPostAlloc = fGrowBy ? newPostAlloc + fGrowBy : newPostAlloc << 1;
    }
    else
    {
        if( !newPreAlloc )
            newPreAlloc++;
        while( newPreAlloc <= newSize )
            newPreAlloc = fGrowBy ? newPreAlloc + fGrowBy : newPreAlloc << 1;
    }
    T* newArray = new T[newPreAlloc + newPostAlloc];
    newArray += newPreAlloc;
    int i;
    for( i = -fNumPre; i < fNumPost; i++ )
        newArray[i] = fArray[i];
//  HSMemory::BlockMove(fArray-fNumPre, newArray-fNumPre, 
//      (fNumPre+fNumPost)*sizeof(*fArray));
    delete [] (fArray-fNumPreAlloc);
    fArray = newArray;
    fNumPreAlloc = newPreAlloc;
    fNumPostAlloc = newPostAlloc;
}

template <class T>
hsBiExpander<T>::hsBiExpander(int32_t minSize, int32_t growBy)
{
    hsThrowIfBadParam(minSize < 0);
    hsThrowIfBadParam(growBy < 0);

    fMinSize = minSize+1;
    fGrowBy = growBy;
    
    fArray  = new T[fMinSize << 1];
    fNumPreAlloc = fNumPostAlloc = fMinSize;
    fArray += fNumPreAlloc;
    
    fNumPre = fNumPost = 0;
}

template <class T>
hsBiExpander<T>::~hsBiExpander()
{
    delete [] (fArray - fNumPreAlloc);
}

template <class T> 
void hsBiExpander<T>::First()
{ 
    fCurrent = -fNumPre; 
}

template <class T> 
void hsBiExpander<T>::Last()
{ 
    fCurrent = fNumPost-1; 
}

template <class T> 
T& hsBiExpander<T>::operator[]( int32_t index )
{
    hsDebugCode(hsThrowIfBadParam((index < -fNumPre)||(index >= fNumPost));)

    return fArray[index];
}

template <class T> 
const T& hsBiExpander<T>::Get( int32_t index ) const
{
    hsDebugCode(hsThrowIfBadParam((index < -fNumPre)||(index >= fNumPost));)

    return fArray[index];
}

template <class T>
int32_t hsBiExpander<T>::Get(int32_t index, int32_t count, T data[]) const
{
    if( count > 0 )
    {   hsThrowIfNilParam(data);
        hsThrowIfBadParam((index < -fNumPre)||(index >= fNumPost));

        if (index + count > fNumPost)
            count = fNumPost - index;
        for (int i = 0; i < count; i++)
            data[i] = fArray[i + index];
    }
    return count;
}

template <class T>
int32_t hsBiExpander<T>::Find(const T& obj) const
{
    for (int i = -fNumPre; i < fNumPost; i++)
        if (fArray[i] == obj)
            return i;
    return kMissingIndex;
}

template <class T>
T* hsBiExpander<T>::Append()
{
    hsAssert(!(fNumPost >= fNumPostAlloc), "Must be less");
    if( fNumPost == fNumPostAlloc-1 )
        IExpand(fNumPostAlloc, true);
    return fArray + fNumPost++;
}

template <class T>
T* hsBiExpander<T>::Push()
{
    hsAssert(!(fNumPre >= fNumPreAlloc), "Must be less");
    if( ++fNumPre == fNumPreAlloc )
        IExpand(fNumPreAlloc, false);
    return fArray - fNumPre;
}

template <class T>
int32_t hsBiExpander<T>::Append(const T& obj)
{
    hsAssert(!(fNumPost >= fNumPostAlloc), "Must be less");
    if( fNumPost == fNumPostAlloc-1 )
        IExpand(fNumPostAlloc, true);
    fArray[fNumPost] = obj;
    return fNumPost++;
}

template <class T>
int32_t hsBiExpander<T>::Push(const T& obj)
{
    hsAssert(!(fNumPre >= fNumPreAlloc), "Must be less");
    if( ++fNumPre == fNumPreAlloc )
        IExpand(fNumPreAlloc, false);
    fArray[-fNumPre] = obj;
    return -fNumPre;
}

template <class T>
int32_t hsBiExpander<T>::PopHead(T*t)
{
    hsThrowIfBadParam(Empty());
    if( t )
        *t = fArray[-fNumPre];
    --fNumPre;
    return GetCount();
}

template <class T>
int32_t hsBiExpander<T>::PopTail(T*t)
{
    hsThrowIfBadParam(Empty());
    --fNumPost;
    if( t )
        *t = fArray[fNumPost];
    return GetCount();
}

template <class T>
void hsBiExpander<T>::Reset()
{
    fNumPre = fNumPost = 0;
}

#endif // hsBiExpander_inc