src/common/unichar.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/unichar.cpp
   3 // Purpose:     wxUniChar and wxUniCharRef classes
   4 // Author:      Vaclav Slavik
   5 // Created:     2007-03-19
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2007 REA Elektronik GmbH
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 // ===========================================================================
  12 // headers
  13 // ===========================================================================
  14
  15 // For compilers that support precompilation, includes "wx.h".
  16 #include "wx/wxprec.h"
  17
  18 #ifdef __BORLANDC__
  19     #pragma hdrstop
  20 #endif
  21
  22 #ifndef WX_PRECOMP
  23     #include "wx/strconv.h"  // wxConvLibc
  24 #endif
  25
  26 #include "wx/unichar.h"
  27
  28 // FIXME-UTF8: remove once UTF-8 functions moved outside
  29 #include "wx/string.h"
  30
  31 // ===========================================================================
  32 // implementation
  33 // ===========================================================================
  34
  35 // ---------------------------------------------------------------------------
  36 // wxUniChar
  37 // ---------------------------------------------------------------------------
  38
  39 /* static */
  40 wxUniChar::value_type wxUniChar::From8bit(char c)
  41 {
  42     // all supported charsets have the first 128 characters same as ASCII:
  43     if ( (unsigned char)c < 0x80 )
  44         return c;
  45
  46     wchar_t buf[2];
  47     if ( wxConvLibc.ToWChar(buf, 2, &c, 1) != 2 )
  48         return wxT('?'); // FIXME-UTF8: what to use as failure character?
  49     return buf[0];
  50 }
  51
  52 /* static */
  53 char wxUniChar::To8bit(wxUniChar::value_type c)
  54 {
  55     // all supported charsets have the first 128 characters same as ASCII:
  56     if ( c < 0x80 )
  57         return c;
  58
  59     wchar_t in = c;
  60     char buf[2];
  61     if ( wxConvLibc.FromWChar(buf, 2, &in, 1) != 2 )
  62         return '?'; // FIXME-UTF8: what to use as failure character?
  63     return buf[0];
  64 }
  65
  66
  67 // ---------------------------------------------------------------------------
  68 // wxUniCharRef
  69 // ---------------------------------------------------------------------------
  70
  71 #if wxUSE_UNICODE_UTF8
  72 wxUniCharRef& wxUniCharRef::operator=(const wxUniChar& c)
  73 {
  74     wxString::Utf8CharBuffer utf(wxString::EncodeChar(c));
  75     size_t lenOld = wxString::GetUtf8CharLength(*m_pos);
  76     size_t lenNew = wxString::GetUtf8CharLength(utf[0]);
  77
  78     if ( lenNew == lenOld )
  79     {
  80         iterator pos(m_pos);
  81         for ( size_t i = 0; i < lenNew; ++i, ++pos )
  82             *pos = utf[i];
  83     }
  84     else
  85     {
  86         size_t idx = m_pos - m_str.begin();
  87
  88         m_str.replace(m_pos, m_pos + lenOld, utf, lenNew);
  89
  90         // this is needed to keep m_pos valid:
  91         m_pos = m_str.begin() + idx;
  92     }
  93
  94     return *this;
  95 }
  96 #endif // wxUSE_UNICODE_UTF8