include/wx/encconv.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/encconv.h
   3 // Purpose:     wxEncodingConverter class for converting between different
   4 //              font encodings
   5 // Author:      Vaclav Slavik
   6 // Copyright:   (c) 1999 Vaclav Slavik
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #ifndef _WX_ENCCONV_H_
  11 #define _WX_ENCCONV_H_
  12
  13 #include "wx/defs.h"
  14
  15 #include "wx/object.h"
  16 #include "wx/fontenc.h"
  17 #include "wx/dynarray.h"
  18
  19 // ----------------------------------------------------------------------------
  20 // constants
  21 // ----------------------------------------------------------------------------
  22
  23 enum
  24 {
  25     wxCONVERT_STRICT,
  26     wxCONVERT_SUBSTITUTE
  27 };
  28
  29
  30 enum
  31 {
  32     wxPLATFORM_CURRENT = -1,
  33
  34     wxPLATFORM_UNIX = 0,
  35     wxPLATFORM_WINDOWS,
  36     wxPLATFORM_OS2,
  37     wxPLATFORM_MAC
  38 };
  39
  40 // ----------------------------------------------------------------------------
  41 // types
  42 // ----------------------------------------------------------------------------
  43
  44 WX_DEFINE_ARRAY_INT(wxFontEncoding, wxFontEncodingArray);
  45
  46 //--------------------------------------------------------------------------------
  47 // wxEncodingConverter
  48 //                  This class is capable of converting strings between any two
  49 //                  8bit encodings/charsets. It can also convert from/to Unicode
  50 //--------------------------------------------------------------------------------
  51
  52 class WXDLLIMPEXP_BASE wxEncodingConverter : public wxObject
  53 {
  54     public:
  55
  56             wxEncodingConverter();
  57             virtual ~wxEncodingConverter() { if (m_Table) delete[] m_Table; }
  58
  59             // Initialize conversion. Both output or input encoding may
  60             // be wxFONTENCODING_UNICODE.
  61             //
  62             // All subsequent calls to Convert() will interpret it's argument
  63             // as a string in input_enc encoding and will output string in
  64             // output_enc encoding.
  65             //
  66             // You must call this method before calling Convert. You may call
  67             // it more than once in order to switch to another conversion
  68             //
  69             // Method affects behaviour of Convert() in case input character
  70             // cannot be converted because it does not exist in output encoding:
  71             //     wxCONVERT_STRICT --
  72             //              follow behaviour of GNU Recode - just copy unconvertable
  73             //              characters to output and don't change them (it's integer
  74             //              value will stay the same)
  75             //     wxCONVERT_SUBSTITUTE --
  76             //              try some (lossy) substitutions - e.g. replace
  77             //              unconvertable latin capitals with acute by ordinary
  78             //              capitals, replace en-dash or em-dash by '-' etc.
  79             //     both modes guarantee that output string will have same length
  80             //     as input string
  81             //
  82             // Returns false if given conversion is impossible, true otherwise
  83             // (conversion may be impossible either if you try to convert
  84             // to Unicode with non-Unicode build of wxWidgets or if input
  85             // or output encoding is not supported.)
  86             bool Init(wxFontEncoding input_enc, wxFontEncoding output_enc, int method = wxCONVERT_STRICT);
  87
  88             // Convert input string according to settings passed to Init.
  89             // Note that you must call Init before using Convert!
  90             bool Convert(const char* input, char* output) const;
  91             bool Convert(char* str) const { return Convert(str, str); }
  92             wxString Convert(const wxString& input) const;
  93
  94             bool Convert(const char* input, wchar_t* output) const;
  95             bool Convert(const wchar_t* input, char* output) const;
  96             bool Convert(const wchar_t* input, wchar_t* output) const;
  97             bool Convert(wchar_t* str) const { return Convert(str, str); }
  98
  99             // Return equivalent(s) for given font that are used
 100             // under given platform. wxPLATFORM_CURRENT means the plaform
 101             // this binary was compiled for
 102             //
 103             // Examples:
 104             //     current platform          enc    returned value
 105             // -----------------------------------------------------
 106             //     unix                   CP1250         {ISO8859_2}
 107             //     unix                ISO8859_2                  {}
 108             //     windows             ISO8859_2            {CP1250}
 109             //
 110             // Equivalence is defined in terms of convertibility:
 111             // 2 encodings are equivalent if you can convert text between
 112             // then without losing information (it may - and will - happen
 113             // that you lose special chars like quotation marks or em-dashes
 114             // but you shouldn't lose any diacritics and language-specific
 115             // characters when converting between equivalent encodings).
 116             //
 117             // Convert() method is not limited to converting between
 118             // equivalent encodings, it can convert between arbitrary
 119             // two encodings!
 120             //
 121             // Remember that this function does _NOT_ check for presence of
 122             // fonts in system. It only tells you what are most suitable
 123             // encodings. (It usually returns only one encoding)
 124             //
 125             // Note that argument enc itself may be present in returned array!
 126             // (so that you can -- as a side effect -- detect whether the
 127             // encoding is native for this platform or not)
 128             static wxFontEncodingArray GetPlatformEquivalents(wxFontEncoding enc, int platform = wxPLATFORM_CURRENT);
 129
 130             // Similar to GetPlatformEquivalent, but this one will return ALL
 131             // equivalent encodings, regardless the platform, including itself.
 132             static wxFontEncodingArray GetAllEquivalents(wxFontEncoding enc);
 133
 134             // Return true if [any text in] one multibyte encoding can be
 135             // converted to another one losslessly.
 136             //
 137             // Do not call this with wxFONTENCODING_UNICODE, it doesn't make
 138             // sense (always works in one sense and always depends on the text
 139             // to convert in the other)
 140             static bool CanConvert(wxFontEncoding encIn, wxFontEncoding encOut)
 141             {
 142                 return GetAllEquivalents(encIn).Index(encOut) != wxNOT_FOUND;
 143             }
 144
 145     private:
 146             wchar_t *m_Table;
 147             bool m_UnicodeInput, m_UnicodeOutput;
 148             bool m_JustCopy;
 149
 150     wxDECLARE_NO_COPY_CLASS(wxEncodingConverter);
 151 };
 152
 153 #endif  // _WX_ENCCONV_H_