avoid creating and immediately destroying a wxGraphicsContext when creating a wxDC...

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

///////////////////////////////////////////////////////////////////////////////
// Name:        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"

// these functions are only used in STL build now but we define them in any
// case for compatibility with the existing code outside of the library which
// could be using them
inline int wxCMPFUNC_CONV wxStringSortAscending(wxString* s1, wxString* s2)
{
    return s1->Cmp(*s2);
}

inline int wxCMPFUNC_CONV wxStringSortDescending(wxString* s1, wxString* s2)
{
    return wxStringSortAscending(s2, s1);
}

#if wxUSE_STD_CONTAINERS

#include "wx/dynarray.h"

typedef int (wxCMPFUNC_CONV *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:
    // type of function used by wxArrayString::Sort()
    typedef int (wxCMPFUNC_CONV *CompareFunction)(const wxString& first,
                                                  const wxString& second);

    wxArrayString() { }
    wxArrayString(const wxArrayString& a) : wxArrayStringBase(a) { }
    wxArrayString(size_t sz, const char** a);
    wxArrayString(size_t sz, const wchar_t** a);
    wxArrayString(size_t sz, const wxString* a);

    int Index(const wxString& str, bool bCase = true, bool bFromEnd = false) const;

    void Sort(bool reverseOrder = false);
    void Sort(CompareFunction function);
    void Sort(CMPFUNCwxString function) { wxArrayStringBase::Sort(function); }

    size_t Add(const wxString& string, size_t copies = 1)
    {
        wxArrayStringBase::Add(string, copies);
        return size() - copies;
    }
};

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 wxString& str, bool bCase = true, bool bFromEnd = false) const;

private:
    void Insert()
    {
        wxFAIL_MSG( "wxSortedArrayString::Insert() is not to be used" );
    }

    void Sort()
    {
        wxFAIL_MSG( "wxSortedArrayString::Sort() is not to be used" );
    }
};

#else // if !wxUSE_STD_CONTAINERS

// this shouldn't be defined for compilers not supporting template methods or
// without std::distance()
//
// FIXME-VC6: currently it's only not defined for VC6 in DLL build as it
//            doesn't export template methods from DLL correctly so even though
//            it compiles them fine, we get link errors when using wxArrayString
#if !defined(__VISUALC6__) || !(defined(WXMAKINGDLL) || defined(WXUSINGDLL))
    #define wxHAS_VECTOR_TEMPLATE_ASSIGN
#endif

#ifdef wxHAS_VECTOR_TEMPLATE_ASSIGN
    #include "wx/beforestd.h"
    #include <iterator>
    #include "wx/afterstd.h"
#endif // wxHAS_VECTOR_TEMPLATE_ASSIGN

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

  // constructors and destructor
    // default ctor
  wxArrayString() { 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!). This
    //     wouldn't be needed if the 'explicit' keyword was supported by all
    //     compilers, or if this was protected ctor for wxSortedArrayString,
    //     but we're stuck with it now.
  wxEXPLICIT wxArrayString(int autoSort) { Init(autoSort != 0); }
    // C string array ctor
  wxArrayString(size_t sz, const char** a);
  wxArrayString(size_t sz, const wchar_t** a);
    // wxString string array ctor
  wxArrayString(size_t sz, const wxString* a);
    // 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)
    {
        wxASSERT_MSG( nIndex < m_nCount,
                      wxT("wxArrayString: index out of bounds") );

        return m_pItems[nIndex];
    }
  const wxString& Item(size_t nIndex) const { return const_cast<wxArrayString*>(this)->Item(nIndex); }

    // same as Item()
  wxString& operator[](size_t nIndex) { return Item(nIndex); }
  const wxString& operator[](size_t nIndex) const { return Item(nIndex); }
    // get last item
  wxString& Last()
  {
      wxASSERT_MSG( !IsEmpty(),
                    wxT("wxArrayString: index out of bounds") );
      return Item(GetCount() - 1);
  }
  const wxString& Last() const { return const_cast<wxArrayString*>(this)->Last(); }


  // 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 wxString& str, 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 wxString& sz);
    // remove item by index
  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 comparison 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;

  // TODO: this code duplicates the one 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) { }
    wxEXPLICIT 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; }
    const itor operator++(int)
      { reverse_iterator tmp = *this; --m_ptr; return tmp; }
    itor& operator--() { ++m_ptr; return *this; }
    const itor operator--(int) { itor tmp = *this; ++m_ptr; return tmp; }
    bool operator ==(const itor& it) const { return m_ptr == it.m_ptr; }
    bool operator !=(const itor& it) const { 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) { }
    wxEXPLICIT 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; }
    const itor operator++(int)
      { itor tmp = *this; --m_ptr; return tmp; }
    itor& operator--() { ++m_ptr; return *this; }
    const itor operator--(int) { itor tmp = *this; ++m_ptr; return tmp; }
    bool operator ==(const itor& it) const { return m_ptr == it.m_ptr; }
    bool operator !=(const itor& it) const { return m_ptr != it.m_ptr; }
  };

  wxArrayString(const_iterator first, const_iterator last)
    { Init(false); assign(first, last); }
  wxArrayString(size_type n, const_reference v) { Init(false); assign(n, v); }

#ifdef wxHAS_VECTOR_TEMPLATE_ASSIGN
  template <class Iterator>
  void assign(Iterator first, Iterator last)
  {
      clear();
      reserve(std::distance(first, last));
      for(; first != last; ++first)
          push_back(*first);
  }
#else // !wxHAS_VECTOR_TEMPLATE_ASSIGN
  void assign(const_iterator first, const_iterator last)
  {
      clear();
      reserve(last - first);
      for(; first != last; ++first)
          push_back(*first);
  }
#endif // wxHAS_VECTOR_TEMPLATE_ASSIGN/!wxHAS_VECTOR_TEMPLATE_ASSIGN

  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 m_pItems; }
  const_iterator begin() const { return m_pItems; }
  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
    { return const_reverse_iterator(end() - 1); }
  reverse_iterator rend() { return reverse_iterator(begin() - 1); }
  const_reverse_iterator rend() const
    { return const_reverse_iterator(begin() - 1); }
  void reserve(size_type n) /* base::reserve*/;
  void resize(size_type n, value_type v = value_type());
  size_type size() const { return GetCount(); }
  void swap(wxArrayString& other)
  {
      wxSwap(m_nSize, other.m_nSize);
      wxSwap(m_nCount, other.m_nCount);
      wxSwap(m_pItems, other.m_pItems);
      wxSwap(m_autoSort, other.m_autoSort);
  }

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

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

  wxString *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_STD_CONTAINERS

// this class provides a temporary wxString* from a
// wxArrayString
class WXDLLIMPEXP_BASE wxCArrayString
{
public:
    wxCArrayString( const wxArrayString& array )
        : m_array( array ), m_strings( NULL )
    { }
    ~wxCArrayString() { delete[] m_strings; }

    size_t GetCount() const { return m_array.GetCount(); }
    wxString* GetStrings()
    {
        if( m_strings ) return m_strings;
        size_t count = m_array.GetCount();
        m_strings = new wxString[count];
        for( size_t i = 0; i < count; ++i )
            m_strings[i] = m_array[i];
        return m_strings;
    }

    wxString* Release()
    {
        wxString *r = GetStrings();
        m_strings = NULL;
        return r;
    }

private:
    const wxArrayString& m_array;
    wxString* m_strings;
};


// ----------------------------------------------------------------------------
// helper functions for working with arrays
// ----------------------------------------------------------------------------

// by default, these functions use the escape character to escape the
// separators occuring inside the string to be joined, this can be disabled by
// passing '\0' as escape

WXDLLIMPEXP_BASE wxString wxJoin(const wxArrayString& arr,
                                 const wxChar sep,
                                 const wxChar escape = wxT('\\'));

WXDLLIMPEXP_BASE wxArrayString wxSplit(const wxString& str,
                                       const wxChar sep,
                                       const wxChar escape = wxT('\\'));


// ----------------------------------------------------------------------------
// This helper class allows to pass both C array of wxStrings or wxArrayString
// using the same interface.
//
// Use it when you have two methods taking wxArrayString or (int, wxString[]),
// that do the same thing. This class lets you iterate over input data in the
// same way whether it is a raw array of strings or wxArrayString.
//
// The object does not take ownership of the data -- internally it keeps
// pointers to the data, therefore the data must be disposed of by user
// and only after this object is destroyed. Usually it is not a problem as
// only temporary objects of this class are used.
// ----------------------------------------------------------------------------

class wxArrayStringsAdapter
{
public:
    // construct an adapter from a wxArrayString
    wxArrayStringsAdapter(const wxArrayString& strings)
        : m_type(wxSTRING_ARRAY), m_size(strings.size())
    {
        m_data.array = &strings;
    }

    // construct an adapter from a wxString[]
    wxArrayStringsAdapter(unsigned int n, const wxString *strings)
        : m_type(wxSTRING_POINTER), m_size(n)
    {
        m_data.ptr = strings;
    }

    // construct an adapter from a single wxString
    wxArrayStringsAdapter(const wxString& s)
        : m_type(wxSTRING_POINTER), m_size(1)
    {
        m_data.ptr = &s;
    }

    // default copy constructor is ok

    // iteration interface
    size_t GetCount() const { return m_size; }
    bool IsEmpty() const { return GetCount() == 0; }
    const wxString& operator[] (unsigned int i) const
    {
        wxASSERT_MSG( i < GetCount(), wxT("index out of bounds") );
        if(m_type == wxSTRING_POINTER)
            return m_data.ptr[i];
        return m_data.array->Item(i);
    }
    wxArrayString AsArrayString() const
    {
        if(m_type == wxSTRING_ARRAY)
            return *m_data.array;
        return wxArrayString(GetCount(), m_data.ptr);
    }

private:
    // type of the data being held
    enum wxStringContainerType
    {
        wxSTRING_ARRAY,  // wxArrayString
        wxSTRING_POINTER // wxString[]
    };

    wxStringContainerType m_type;
    size_t m_size;
    union
    {
        const wxString *      ptr;
        const wxArrayString * array;
    } m_data;

    wxDECLARE_NO_ASSIGN_CLASS(wxArrayStringsAdapter);
};

#endif // _WX_ARRSTR_H