ut_vector.h

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/* -*- mode: C++; tab-width: 4; c-basic-offset: 4; -*- */

/* AbiSource Program Utilities
 * Copyright (C) 1998-2000 AbiSource, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#ifndef UTVECTOR_H
#define UTVECTOR_H

/* pre-emptive dismissal; ut_types.h is needed by just about everything,
 * so even if it's commented out in-file that's still a lot of work for
 * the preprocessor to do...
 */
#ifndef UT_TYPES_H
#include "ut_types.h"
#endif
#include "ut_assert.h"
#include "ut_debugmsg.h"
// ----------------------------------------------------------------

#define UT_VECTOR_CLEANUP(d, v, r) \
    do  {   int utv_max = v.getItemCount();             \
            for (int utv=utv_max-1; utv>=0; utv--)      \
            {                                           \
                d utv_p = (d) v.getNthItem(utv);        \
                UT_ASSERT_HARMLESS(utv_p);              \
                if (utv_p)                              \
                    r (utv_p);                      \
            }                                           \
    } while (0)

#define UT_VECTOR_SPARSECLEANUP(d, v, r) \
    do  {   int utv_max = v.getItemCount();             \
            for (int utv=utv_max-1; utv>=0; utv--)      \
            {                                           \
                d utv_p = (d) v.getNthItem(utv);        \
                if (utv_p)                              \
                    r (utv_p);                      \
            }                                           \
    } while (0)

#define UT_VECTOR_PURGEALL(d, v) UT_VECTOR_CLEANUP(d, v, delete)
#define UT_VECTOR_FREEALL(d, v) UT_VECTOR_CLEANUP(d, v, g_free)
#define UT_VECTOR_SPARSEPURGEALL(d, v) UT_VECTOR_SPARSECLEANUP(d, v, delete)
#define UT_VECTOR_SPARSEFREEALL(d, v) UT_VECTOR_SPARSECLEANUP(d, v, g_free)

/* don't call this macro unless you are in Obj-C++ */
/* release any non nil objective-C object of the array */
#define UT_VECTOR_RELEASE(v) \
    {                       \
        int utv_max = v.getItemCount();             \
            for (int utv=utv_max-1; utv>=0; utv--)      \
            {                                           \
                id utv_p = (id) v.getNthItem(utv);      \
                [utv_p release];                                \
            }                                       \
    }


template <class T> class UT_GenericVector
{
public:
    typedef int (*compar_fn_t) (const void *, const void *);

    // Real-life tests shown that vast majority of our vectors contain less than 4 items
    // and virtually all contains less than 32 elements; I have adjusted the initial
    // values accordingly. Where vectors are known to be larger, bigger values should be
    // passed to the constructor, and, if approprite, pre-allocation forced
    UT_GenericVector(UT_sint32 sizehint = 32, UT_sint32 baseincr = 4, bool bPrealloc = false);
    UT_GenericVector(const UT_GenericVector<T>&);
    UT_GenericVector<T>& operator=(const UT_GenericVector<T>&);
    virtual ~UT_GenericVector();

    UT_sint32   addItem(const T);
    inline UT_sint32    push_back(const T item) { return addItem(item); }
    bool                pop_back();
    inline const T  back() const            { return getLastItem(); }

    UT_sint32   addItem(const T p, UT_sint32 * pIndex);

    /* FIXME -- this function assumes that it is possible to do
     *          static_cast<T>(0)
     */
    inline T getNthItem(UT_sint32 n) const
    {
        UT_ASSERT_HARMLESS(m_pEntries);
        UT_ASSERT_HARMLESS(m_iCount > 0);
        UT_ASSERT_HARMLESS(n<m_iCount);

        if(n >= m_iCount || !m_pEntries) {
            return 0;
        }
        return m_pEntries[n];
    }

    const T     operator[](UT_sint32 i) const;
    UT_sint32   setNthItem(UT_sint32 ndx, T pNew, T * ppOld);
    const T     getFirstItem() const;
    const T     getLastItem() const;
    inline UT_sint32 getItemCount() const { return m_iCount; }
    UT_sint32   findItem(T) const;

    UT_sint32   insertItemAt(T, UT_sint32 ndx);
    UT_sint32   addItemSorted(const T p, int (*compar)(const void *, const void *));
    void        deleteNthItem(UT_sint32 n);
    void        clear();
    void        qsort(int (*compar)(const void *, const void *));
    UT_sint32   binarysearch(const void* key, int (*compar)(const void *, const void *)) const;

    bool        copy(const UT_GenericVector<T> *pVec);
    inline UT_sint32 size() const { return getItemCount(); }

private:
    UT_sint32       grow(UT_sint32);
    UT_sint32       binarysearchForSlot(const void* key, compar_fn_t compar) const;

    T*          m_pEntries;
    UT_sint32       m_iCount;
    UT_sint32       m_iSpace;
    UT_sint32       m_iCutoffDouble;
    UT_sint32       m_iPostCutoffIncrement;
};

// TODO Rob: try to export like this once plugin loading is fixed:
// template class ABI_EXPORT UT_GenericVector<void const *>;
class ABI_EXPORT UT_Vector : public UT_GenericVector<void const *> {
public:
    UT_Vector(UT_sint32 sizehint = 32, UT_sint32 baseincr = 4, bool bPrealloc = false)
    : UT_GenericVector<void const *>(sizehint, baseincr, bPrealloc)
    {}
};

// TODO Rob: try to export like this once plugin loading is fixed:
// template class ABI_EXPORT UT_GenericVector<UT_sint32>;
class ABI_EXPORT UT_NumberVector : public UT_GenericVector<UT_sint32> {
public:
    UT_NumberVector(UT_sint32 sizehint = 32, UT_sint32 baseincr = 4, bool bPrealloc = false)
    : UT_GenericVector<UT_sint32>(sizehint, baseincr, bPrealloc)
    {}
};

#include <stdlib.h>
#include <string.h>

template <class T>
UT_GenericVector<T>::UT_GenericVector(UT_sint32 sizehint, UT_sint32 baseincr, bool bPrealoc)
  : m_pEntries(NULL), m_iCount(0), m_iSpace(0),
    m_iCutoffDouble(sizehint), m_iPostCutoffIncrement(baseincr)
{
    if(bPrealoc)
        grow(sizehint);
}

template <class T>
UT_GenericVector<T>::UT_GenericVector(const UT_GenericVector<T>& utv)
  : m_pEntries(NULL), m_iCount(0), m_iSpace(0), 
  m_iCutoffDouble(utv.m_iCutoffDouble), 
  m_iPostCutoffIncrement(utv.m_iPostCutoffIncrement) 
{
    copy(&utv);
}

template <class T>
UT_GenericVector<T>& UT_GenericVector<T>::operator=(const UT_GenericVector<T>& utv)
{
    if(this != &utv)
    {
        m_iCutoffDouble = utv.m_iCutoffDouble;
        m_iPostCutoffIncrement = utv.m_iPostCutoffIncrement;
        copy(&utv);
    }
    return *this;
}

template <class T>
void UT_GenericVector<T>::clear()
{
    if(m_iCount > m_iCutoffDouble)
    {
        UT_DEBUGMSG(("Vector contained %d entries, allocated %d slots\n", m_iCount, m_iSpace));
    }
    
    m_iCount = 0;
    memset(m_pEntries, 0, m_iSpace * sizeof(T));
}


template <class T>
UT_GenericVector<T>::~UT_GenericVector()
{
    if(m_iCount >  m_iCutoffDouble)
    {
        UT_DEBUGMSG(("Vector contained %d entries, allocated %d slots\n", m_iCount, m_iSpace));
    }
    
    FREEP(m_pEntries);
}

/*
 This function is called everytime we want to insert a new element but don't have
 enough space.  In this case we grow the array to be _at least_ ndx size.
*/
template <class T>
UT_sint32 UT_GenericVector<T>::grow(UT_sint32 ndx)
{
    UT_sint32 new_iSpace;
    if(!m_iSpace) {
        new_iSpace = m_iPostCutoffIncrement;
    }
    else if (m_iSpace < m_iCutoffDouble) {
        xxx_UT_DEBUGMSG(("Vector growing (%d -> %d\n", m_iSpace, ndx));
        new_iSpace = m_iSpace * 2;
    }
    else {
        new_iSpace = m_iSpace + m_iPostCutoffIncrement;
    }

    if (new_iSpace < ndx)
    {
        new_iSpace = ndx;
    }

    T * new_pEntries = static_cast<T *>(g_try_realloc(m_pEntries, new_iSpace * sizeof(T)));
    if (!new_pEntries) {
        return -1;
    }
    //Is this required? We always check Count first anyways.
    // TMN: Unfortunately it is, since the class GR_CharWidths
    // uses UT_GenericVector<T> as a sparse array!
    memset(&new_pEntries[m_iSpace], 0, (new_iSpace - m_iSpace) * sizeof(T));
    m_iSpace = new_iSpace;
    m_pEntries = new_pEntries;

    return 0;
}

template <class T>
UT_sint32 UT_GenericVector<T>::insertItemAt(const T p, UT_sint32 ndx)
{
    if (ndx > m_iCount + 1)
        return -1;

    if ((m_iCount+1) > m_iSpace)
    {
        UT_sint32 err = grow(0);
        if (err)
        {
            return err;
        }
    }

    // bump the elements -> thataway up to the ndxth position
    memmove(&m_pEntries[ndx+1], &m_pEntries[ndx], (m_iCount - ndx) * sizeof(T));

    m_pEntries[ndx] = (T)p;
    ++m_iCount;

    return 0;
}

template <class T>
UT_sint32 UT_GenericVector<T>::addItem(const T p, UT_sint32 * pIndex)
{
    UT_sint32 err = addItem(p);
    if (!err && pIndex)
        *pIndex = m_iCount-1;
    return err;
}

template <class T>
UT_sint32 UT_GenericVector<T>::addItem(const T p)
{
    if ((m_iCount+1) > m_iSpace)
    {
        UT_sint32 err = grow(0);
        if (err)
        {
            return err;
        }
    }

    m_pEntries[m_iCount++] = (T)p;  /*** bad, cast away const so we can build again ***/

    return 0;
}

template <class T>
UT_sint32 UT_GenericVector<T>::addItemSorted(const T p, int (*compar)(const void *, const void *))
{
    if (!m_iCount) {
        return addItem(p);
    }

    return insertItemAt( p, binarysearchForSlot((static_cast<void*>(const_cast<T*>(&p))), compar));
}

template <class T>
bool UT_GenericVector<T>::pop_back()
{
    if (m_iCount > 0)
    {
        --m_iCount;
        return true;
    }
    else
        return false;
}

template <class T>
UT_sint32 UT_GenericVector<T>::setNthItem(UT_sint32 ndx, T pNew, T* ppOld)
{
    const UT_sint32 old_iSpace = m_iSpace;

    if (ndx >= m_iSpace)
    {
        const UT_sint32 err = grow(ndx+1);
        if (err)
        {
            return err;
        }
    }

    if (ppOld)
    {
        *ppOld = (ndx < old_iSpace) ? m_pEntries[ndx] : 0;
    }

    m_pEntries[ndx] = pNew;
    if (ndx >= m_iCount)
    {
        m_iCount = ndx + 1;
    }

    return 0;
}

template <class T>
const T UT_GenericVector<T>::getLastItem() const
{
    UT_ASSERT_HARMLESS(m_iCount > 0);

    return m_pEntries[m_iCount-1];
}

template <class T>
const T UT_GenericVector<T>::getFirstItem() const
{
    UT_ASSERT_HARMLESS(m_iCount > 0);
    UT_ASSERT_HARMLESS(m_pEntries);

    return m_pEntries[0];
}

template <class T>
void UT_GenericVector<T>::deleteNthItem(UT_sint32 n)
{
    UT_ASSERT_HARMLESS(n < m_iCount);
    UT_ASSERT_HARMLESS(m_iCount > 0);

    memmove(&m_pEntries[n], &m_pEntries[n+1], (m_iCount - (n + 1)) * sizeof(T));

    m_pEntries[m_iCount-1] = 0;
    m_iCount--;

    return;
}

template <class T>
UT_sint32 UT_GenericVector<T>::findItem(T p) const
{
    for (UT_sint32 i=0; i<m_iCount; i++)
    {
        if (m_pEntries[i] == p)
        {
            return i;
        }
    }

    return -1;
}

template <class T>
void UT_GenericVector<T>::qsort(int (*compar)(const void *, const void *))
{
	::qsort(m_pEntries, m_iCount, sizeof(T), compar);
}

// this binary search finds the earliest element (lowest index)
// in the vector which matches the key
// based on code from Tim Bray's 'On the Goodness of Binary Search'
// http://tbray.org/ongoing/When/200x/2003/03/22/Binary

template <class T>
UT_sint32 UT_GenericVector<T>::binarysearch(const void* key, compar_fn_t compar) const
{
    UT_sint32 slot = binarysearchForSlot(key, compar);

    if ((slot == m_iCount) || (0 != (*compar)(key, &m_pEntries[slot])))
        return -1;
    else
        return slot;
}

template <class T>
UT_sint32 UT_GenericVector<T>::binarysearchForSlot(const void* key, compar_fn_t compar) const
{
    UT_sint32 high = m_iCount;
    UT_sint32 low = -1;
    UT_sint32 probe;

    while (high - low > 1)
    {
        int res;
        probe = (high + low) / 2;
        res = (*compar)(key, &m_pEntries[probe]);
        if (0 < res)
            low = probe;
        else
            high = probe;
    }

    return high;
}

template <class T>
bool UT_GenericVector<T>::copy(const UT_GenericVector<T> *pVec)
{
    clear();

    for (UT_sint32 i=0; i < pVec->m_iCount; i++)
    {
        UT_sint32 err;

        err = addItem(pVec->m_pEntries[i]);
        if(err == -1)
            return (err ? true : false);
    }

    return 0;
}

template <class T>
const T UT_GenericVector<T>::operator[](UT_sint32 i) const
{
    return this->getNthItem(i);
}


#endif /* UTVECTOR_H */

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