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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  14 #pragma interface "encconv.h"
  15 #endif
  16
  17 #include "wx/defs.h"
  18
  19 #if wxUSE_FONTMAP
  20
  21 #include "wx/object.h"
  22 #include "wx/fontenc.h"
  23 #include "wx/dynarray.h"
  24
  25 // ----------------------------------------------------------------------------
  26 // constants
  27 // ----------------------------------------------------------------------------
  28
  29 enum
  30 {
  31     wxCONVERT_STRICT,
  32     wxCONVERT_SUBSTITUTE
  33 };
  34
  35
  36 enum
  37 {
  38     wxPLATFORM_CURRENT = -1,
  39
  40     wxPLATFORM_UNIX = 0,
  41     wxPLATFORM_WINDOWS,
  42     wxPLATFORM_OS2,
  43     wxPLATFORM_MAC
  44 };
  45
  46 // ----------------------------------------------------------------------------
  47 // types
  48 // ----------------------------------------------------------------------------
  49
  50 WX_DEFINE_ARRAY_INT(wxFontEncoding, wxFontEncodingArray);
  51
  52 //--------------------------------------------------------------------------------
  53 // wxEncodingConverter
  54 //                  This class is capable of converting strings between any two
  55 //                  8bit encodings/charsets. It can also convert from/to Unicode
  56 //--------------------------------------------------------------------------------
  57
  58 class WXDLLIMPEXP_BASE wxEncodingConverter : public wxObject
  59 {
  60     public:
  61
  62             wxEncodingConverter();
  63             ~wxEncodingConverter() { if (m_Table) delete[] m_Table; }
  64
  65             // Initialize conversion. Both output or input encoding may
  66             // be wxFONTENCODING_UNICODE, but only if wxUSE_WCHAR_T is set to 1.
  67             //
  68             // All subsequent calls to Convert() will interpret it's argument
  69             // as a string in input_enc encoding and will output string in
  70             // output_enc encoding.
  71             //
  72             // You must call this method before calling Convert. You may call
  73             // it more than once in order to switch to another conversion
  74             //
  75             // Method affects behaviour of Convert() in case input character
  76             // cannot be converted because it does not exist in output encoding:
  77             //     wxCONVERT_STRICT --
  78             //              follow behaviour of GNU Recode - just copy unconvertable
  79             //              characters to output and don't change them (it's integer
  80             //              value will stay the same)
  81             //     wxCONVERT_SUBSTITUTE --
  82             //              try some (lossy) substitutions - e.g. replace
  83             //              unconvertable latin capitals with acute by ordinary
  84             //              capitals, replace en-dash or em-dash by '-' etc.
  85             //     both modes gurantee that output string will have same length
  86             //     as input string
  87             //
  88             // Returns false if given conversion is impossible, true otherwise
  89             // (conversion may be impossible either if you try to convert
  90             // to Unicode with non-Unicode build of wxWidgets or if input
  91             // or output encoding is not supported.)
  92             bool Init(wxFontEncoding input_enc, wxFontEncoding output_enc, int method = wxCONVERT_STRICT);
  93
  94             // Convert input string according to settings passed to Init.
  95             // Note that you must call Init before using Convert!
  96             void Convert(const char* input, char* output) const;
  97             void Convert(char* str) const { Convert(str, str); }
  98             wxString Convert(const wxString& input) const;
  99
 100 #if wxUSE_WCHAR_T
 101             void Convert(const char* input, wchar_t* output) const;
 102             void Convert(const wchar_t* input, char* output) const;
 103             void Convert(const wchar_t* input, wchar_t* output) const;
 104             void Convert(wchar_t* str) const { Convert(str, str); }
 105 #endif
 106             // Return equivalent(s) for given font that are used
 107             // under given platform. wxPLATFORM_CURRENT means the plaform
 108             // this binary was compiled for
 109             //
 110             // Examples:
 111             //     current platform          enc    returned value
 112             // -----------------------------------------------------
 113             //     unix                   CP1250         {ISO8859_2}
 114             //     unix                ISO8859_2                  {}
 115             //     windows             ISO8859_2            {CP1250}
 116             //
 117             // Equivalence is defined in terms of convertibility:
 118             // 2 encodings are equivalent if you can convert text between
 119             // then without loosing information (it may - and will - happen
 120             // that you loose special chars like quotation marks or em-dashes
 121             // but you shouldn't loose any diacritics and language-specific
 122             // characters when converting between equivalent encodings).
 123             //
 124             // Convert() method is not limited to converting between
 125             // equivalent encodings, it can convert between arbitrary
 126             // two encodings!
 127             //
 128             // Remember that this function does _NOT_ check for presence of
 129             // fonts in system. It only tells you what are most suitable
 130             // encodings. (It usually returns only one encoding)
 131             //
 132             // Note that argument enc itself may be present in returned array!
 133             // (so that you can -- as a side effect -- detect whether the
 134             // encoding is native for this platform or not)
 135             static wxFontEncodingArray GetPlatformEquivalents(wxFontEncoding enc, int platform = wxPLATFORM_CURRENT);
 136
 137             // Similar to GetPlatformEquivalent, but this one will return ALL
 138             // equivalent encodings, regardless the platform, including itself.
 139             static wxFontEncodingArray GetAllEquivalents(wxFontEncoding enc);
 140
 141             // Return true if [any text in] one multibyte encoding can be
 142             // converted to another one losslessly.
 143             //
 144             // Do not call this with wxFONTENCODING_UNICODE, it doesn't make
 145             // sense (always works in one sense and always depends on the text
 146             // to convert in the other)
 147             static bool CanConvert(wxFontEncoding encIn, wxFontEncoding encOut)
 148             {
 149                 return GetAllEquivalents(encIn).Index(encOut) != wxNOT_FOUND;
 150             }
 151
 152     private:
 153
 154 #if wxUSE_WCHAR_T
 155             wchar_t *m_Table;
 156 #else
 157             char *m_Table;
 158 #endif
 159             bool m_UnicodeInput, m_UnicodeOutput;
 160             bool m_JustCopy;
 161
 162     DECLARE_NO_COPY_CLASS(wxEncodingConverter)
 163 };
 164
 165 #endif // wxUSE_FONTMAP
 166
 167 #endif  // _WX_ENCCONV_H_