assume sizeof(wchar_t) == 2 by default, not 4

[wxWidgets.git] / include / wx / arrstr.h

///////////////////////////////////////////////////////////////////////////////
// Name:        include/wx/arrstr.h
// Purpose:     wxArrayString class
// Author:      Mattia Barbon and Vadim Zeitlin
// Modified by:
// Created:     07/07/03
// RCS-ID:      $Id$
// Copyright:   (c) 2003 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

#ifndef _WX_ARRSTR_H
#define _WX_ARRSTR_H

#include "wx/defs.h"
#include "wx/string.h"

WXDLLIMPEXP_BASE int wxStringSortAscending(wxString*, wxString*);
WXDLLIMPEXP_BASE int wxStringSortDescending(wxString*, wxString*);

#if wxUSE_STL

#include "wx/dynarray.h"

typedef int (*CMPFUNCwxString)(wxString*, wxString*);
typedef wxString _wxArraywxBaseArrayStringBase;
_WX_DECLARE_BASEARRAY_2(_wxArraywxBaseArrayStringBase, wxBaseArrayStringBase,
                        wxArray_SortFunction<wxString>,
                        class WXDLLIMPEXP_BASE);
WX_DEFINE_USER_EXPORTED_TYPEARRAY(wxString, wxArrayStringBase, 
                                  wxBaseArrayStringBase, WXDLLIMPEXP_BASE);
_WX_DEFINE_SORTED_TYPEARRAY_2(wxString, wxSortedArrayStringBase, 
                              wxBaseArrayStringBase, = wxStringSortAscending,
                              class WXDLLIMPEXP_BASE, CMPFUNCwxString);

class WXDLLIMPEXP_BASE wxArrayString : public wxArrayStringBase
{
public:
    wxArrayString() { }
    wxArrayString(const wxArrayString& a) : wxArrayStringBase(a) { }

    int Index(const wxChar* sz, bool bCase = true, bool bFromEnd = false) const;
};

class WXDLLIMPEXP_BASE wxSortedArrayString : public wxSortedArrayStringBase
{
public:
    wxSortedArrayString() : wxSortedArrayStringBase(wxStringSortAscending)
        { }
    wxSortedArrayString(const wxSortedArrayString& array)
        : wxSortedArrayStringBase(array)
        { }
    wxSortedArrayString(const wxArrayString& src)
        : wxSortedArrayStringBase(wxStringSortAscending)
    {
        reserve(src.size());

        for ( size_t n = 0; n < src.size(); n++ )
            Add(src[n]);
    }

    int Index(const wxChar* sz, bool bCase = true, bool bFromEnd = false) const;
};

#else // if !wxUSE_STL

// ----------------------------------------------------------------------------
// The string array uses it's knowledge of internal structure of the wxString
// class to optimize string storage. Normally, we would store pointers to
// string, but as wxString is, in fact, itself a pointer (sizeof(wxString) is
// sizeof(char *)) we store these pointers instead. The cast to "wxString *" is
// really all we need to turn such pointer into a string!
//
// Of course, it can be called a dirty hack, but we use twice less memory and
// this approach is also more speed efficient, so it's probably worth it.
//
// Usage notes: when a string is added/inserted, a new copy of it is created,
// so the original string may be safely deleted. When a string is retrieved
// from the array (operator[] or Item() method), a reference is returned.
// ----------------------------------------------------------------------------

class WXDLLIMPEXP_BASE wxArrayString
{
public:
  // type of function used by wxArrayString::Sort()
  typedef int (*CompareFunction)(const wxString& first,
                                 const wxString& second);
  // type of function used by wxArrayString::Sort(), for compatibility with
  // wxArray
  typedef int (*CompareFunction2)(wxString* first,
                                  wxString* second);

  // constructors and destructor
    // default ctor
  wxArrayString()
      : m_nSize(0), m_nCount(0), m_pItems(NULL), m_autoSort(FALSE)
      { Init(FALSE); }
    // if autoSort is TRUE, the array is always sorted (in alphabetical order)
    //
    // NB: the reason for using int and not bool is that like this we can avoid
    //     using this ctor for implicit conversions from "const char *" (which
    //     we'd like to be implicitly converted to wxString instead!)
    //
    //     of course, using explicit would be even better - if all compilers
    //     supported it...
  wxArrayString(int autoSort)
      : m_nSize(0), m_nCount(0), m_pItems(NULL), m_autoSort(FALSE)
      { Init(autoSort != 0); }
    // copy ctor
  wxArrayString(const wxArrayString& array);
    // assignment operator
  wxArrayString& operator=(const wxArrayString& src);
    // not virtual, this class should not be derived from
 ~wxArrayString();

  // memory management
    // empties the list, but doesn't release memory
  void Empty();
    // empties the list and releases memory
  void Clear();
    // preallocates memory for given number of items
  void Alloc(size_t nCount);
    // minimzes the memory usage (by freeing all extra memory)
  void Shrink();

  // simple accessors
    // number of elements in the array
  size_t GetCount() const { return m_nCount; }
    // is it empty?
  bool IsEmpty() const { return m_nCount == 0; }
    // number of elements in the array (GetCount is preferred API)
  size_t Count() const { return m_nCount; }

  // items access (range checking is done in debug version)
    // get item at position uiIndex
  wxString& Item(size_t nIndex) const
    {
        wxASSERT_MSG( nIndex < m_nCount,
                      _T("wxArrayString: index out of bounds") );

        return *(wxString *)&(m_pItems[nIndex]);
    }

    // same as Item()
  wxString& operator[](size_t nIndex) const { return Item(nIndex); }
    // get last item
  wxString& Last() const
  {
      wxASSERT_MSG( !IsEmpty(),
                    _T("wxArrayString: index out of bounds") );
      return Item(Count() - 1);
  }

#if WXWIN_COMPATIBILITY_2_4
    // return a wxString[], useful for the controls which
    // take one in their ctor.  You must delete[] it yourself
    // once you are done with it.  Will return NULL if the
    // ArrayString was empty.
  wxString* GetStringArray() const;
#endif

  // item management
    // Search the element in the array, starting from the beginning if
    // bFromEnd is FALSE or from end otherwise. If bCase, comparison is case
    // sensitive (default). Returns index of the first item matched or
    // wxNOT_FOUND
  int  Index (const wxChar *sz, bool bCase = TRUE, bool bFromEnd = FALSE) const;
    // add new element at the end (if the array is not sorted), return its
    // index
  size_t Add(const wxString& str, size_t nInsert = 1);
    // add new element at given position
  void Insert(const wxString& str, size_t uiIndex, size_t nInsert = 1);
    // expand the array to have count elements
  void SetCount(size_t count);
    // remove first item matching this value
  void Remove(const wxChar *sz);
    // remove item by index
#if WXWIN_COMPATIBILITY_2_4
  void Remove(size_t nIndex, size_t nRemove = 1) { RemoveAt(nIndex, nRemove); }
#endif
  void RemoveAt(size_t nIndex, size_t nRemove = 1);

  // sorting
    // sort array elements in alphabetical order (or reversed alphabetical
    // order if reverseOrder parameter is TRUE)
  void Sort(bool reverseOrder = FALSE);
    // sort array elements using specified comparaison function
  void Sort(CompareFunction compareFunction);
  void Sort(CompareFunction2 compareFunction);

  // comparison
    // compare two arrays case sensitively
  bool operator==(const wxArrayString& a) const;
    // compare two arrays case sensitively
  bool operator!=(const wxArrayString& a) const { return !(*this == a); }

  // STL-like interface
  typedef wxString value_type;
  typedef value_type* pointer;
  typedef const value_type* const_pointer;
  typedef value_type* iterator;
  typedef const value_type* const_iterator;
  typedef value_type& reference;
  typedef const value_type& const_reference;
  typedef int difference_type;
  typedef size_t size_type;

  // FIXME: same in dynarray.h
  class reverse_iterator
  {
    typedef wxString value_type;
    typedef value_type* pointer;
    typedef value_type& reference;
    typedef reverse_iterator itor;
    friend itor operator+(int o, const itor& it);
    friend itor operator+(const itor& it, int o);
    friend itor operator-(const itor& it, int o);
    friend difference_type operator -(const itor& i1, const itor& i2);
  public:
    pointer m_ptr;
    reverse_iterator() : m_ptr(NULL) { }
    reverse_iterator(pointer ptr) : m_ptr(ptr) { }
    reverse_iterator(const itor& it) : m_ptr(it.m_ptr) { }
    reference operator*() const { return *m_ptr; }
    pointer operator->() const { return m_ptr; }
    itor operator++() { --m_ptr; return *this; }
    itor operator++(int)
      { reverse_iterator tmp = *this; --m_ptr; return tmp; }
    itor operator--() { ++m_ptr; return *this; }
    itor operator--(int) { itor tmp = *this; ++m_ptr; return tmp; }
    bool operator ==(const itor& it) { return m_ptr == it.m_ptr; }
    bool operator !=(const itor& it) { return m_ptr != it.m_ptr; }
  };

  class const_reverse_iterator
  {
    typedef wxString value_type;
    typedef const value_type* pointer;
    typedef const value_type& reference;
    typedef const_reverse_iterator itor;
    friend itor operator+(int o, const itor& it);
    friend itor operator+(const itor& it, int o);
    friend itor operator-(const itor& it, int o);
    friend difference_type operator -(const itor& i1, const itor& i2);
  public:
    pointer m_ptr;
    const_reverse_iterator() : m_ptr(NULL) { }
    const_reverse_iterator(pointer ptr) : m_ptr(ptr) { }
    const_reverse_iterator(const itor& it) : m_ptr(it.m_ptr) { }
    const_reverse_iterator(const reverse_iterator& it) : m_ptr(it.m_ptr) { }
    reference operator*() const { return *m_ptr; }
    pointer operator->() const { return m_ptr; }
    itor operator++() { --m_ptr; return *this; }
    itor operator++(int)
      { itor tmp = *this; --m_ptr; return tmp; }
    itor operator--() { ++m_ptr; return *this; }
    itor operator--(int) { itor tmp = *this; ++m_ptr; return tmp; }
    bool operator ==(const itor& it) { return m_ptr == it.m_ptr; }
    bool operator !=(const itor& it) { return m_ptr != it.m_ptr; }
  };

  void assign(const_iterator first, const_iterator last);
  void assign(size_type n, const_reference v)
    { clear(); Add(v, n); }
  reference back() { return *(end() - 1); }
  const_reference back() const { return *(end() - 1); }
  iterator begin() { return (wxString *)&(m_pItems[0]); }
  const_iterator begin() const { return (wxString *)&(m_pItems[0]); }
  size_type capacity() const { return m_nSize; }
  void clear() { Clear(); }
  bool empty() const { return IsEmpty(); }
  iterator end() { return begin() + GetCount(); }
  const_iterator end() const { return begin() + GetCount(); }
  iterator erase(iterator first, iterator last)
  {
      size_t idx = first - begin();
      RemoveAt(idx, last - first);
      return begin() + idx;
  }
  iterator erase(iterator it) { return erase(it, it + 1); }
  reference front() { return *begin(); }
  const_reference front() const { return *begin(); }
  void insert(iterator it, size_type n, const_reference v)
    { Insert(v, it - begin(), n); }
  iterator insert(iterator it, const_reference v = value_type())
    { size_t idx = it - begin(); Insert(v, idx); return begin() + idx; }
  void insert(iterator it, const_iterator first, const_iterator last);
  size_type max_size() const { return INT_MAX; }
  void pop_back() { RemoveAt(GetCount() - 1); }
  void push_back(const_reference v) { Add(v); }
  reverse_iterator rbegin() { return reverse_iterator(end() - 1); }
  const_reverse_iterator rbegin() const;
  reverse_iterator rend() { return reverse_iterator(begin() - 1); }
  const_reverse_iterator rend() const;
  void reserve(size_type n) /* base::reserve*/;
  void resize(size_type n, value_type v = value_type());
  size_type size() const { return GetCount(); }

protected:
  void Init(bool autoSort);             // common part of all ctors
  void Copy(const wxArrayString& src);  // copies the contents of another array

private:
  void Grow(size_t nIncrement = 0);     // makes array bigger if needed
  void Free();                          // free all the strings stored

  void DoSort();                        // common part of all Sort() variants

  size_t  m_nSize,    // current size of the array
          m_nCount;   // current number of elements

  wxChar  **m_pItems; // pointer to data

  bool    m_autoSort; // if TRUE, keep the array always sorted
};

class WXDLLIMPEXP_BASE wxSortedArrayString : public wxArrayString
{
public:
  wxSortedArrayString() : wxArrayString(TRUE)
    { }
  wxSortedArrayString(const wxArrayString& array) : wxArrayString(TRUE)
    { Copy(array); }
};

#endif // !wxUSE_STL

#endif