src/common/textbuf.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/textbuf.cpp
   3 // Purpose:     implementation of wxTextBuffer class
   4 // Created:     14.11.01
   5 // Author:      Morten Hanssen, Vadim Zeitlin
   6 // Copyright:   (c) 1998-2001 wxWidgets team
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 // ============================================================================
  11 // headers
  12 // ============================================================================
  13
  14 #include  "wx/wxprec.h"
  15
  16 #ifdef __BORLANDC__
  17     #pragma hdrstop
  18 #endif  //__BORLANDC__
  19
  20 #ifndef WX_PRECOMP
  21     #include  "wx/string.h"
  22     #include  "wx/intl.h"
  23     #include  "wx/log.h"
  24 #endif
  25
  26 #include "wx/textbuf.h"
  27
  28 // ============================================================================
  29 // wxTextBuffer class implementation
  30 // ============================================================================
  31
  32 // ----------------------------------------------------------------------------
  33 // static methods (always compiled in)
  34 // ----------------------------------------------------------------------------
  35
  36 // default type is the native one
  37 // the native type under Mac OS X is:
  38 //   - Unix when compiling with the Apple Developer Tools (__UNIX__)
  39 //   - Mac when compiling with CodeWarrior (__WXMAC__)
  40
  41 const wxTextFileType wxTextBuffer::typeDefault =
  42 #if defined(__WINDOWS__) || defined(__DOS__) || defined(__PALMOS__)
  43   wxTextFileType_Dos;
  44 #elif defined(__UNIX__)
  45   wxTextFileType_Unix;
  46 #elif defined(__WXMAC__)
  47   wxTextFileType_Mac;
  48 #elif defined(__WXPM__)
  49   wxTextFileType_Os2;
  50 #else
  51   wxTextFileType_None;
  52   #error  "wxTextBuffer: unsupported platform."
  53 #endif
  54
  55 const wxChar *wxTextBuffer::GetEOL(wxTextFileType type)
  56 {
  57     switch ( type ) {
  58         default:
  59             wxFAIL_MSG(wxT("bad buffer type in wxTextBuffer::GetEOL."));
  60             // fall through nevertheless - we must return something...
  61
  62         case wxTextFileType_None: return wxEmptyString;
  63         case wxTextFileType_Unix: return wxT("\n");
  64         case wxTextFileType_Dos:  return wxT("\r\n");
  65         case wxTextFileType_Mac:  return wxT("\r");
  66     }
  67 }
  68
  69 wxString wxTextBuffer::Translate(const wxString& text, wxTextFileType type)
  70 {
  71     // don't do anything if there is nothing to do
  72     if ( type == wxTextFileType_None )
  73         return text;
  74
  75     // nor if it is empty
  76     if ( text.empty() )
  77         return text;
  78
  79     wxString eol = GetEOL(type), result;
  80
  81     // optimization: we know that the length of the new string will be about
  82     // the same as the length of the old one, so prealloc memory to aviod
  83     // unnecessary relocations
  84     result.Alloc(text.Len());
  85
  86     wxChar chLast = 0;
  87     for ( const wxChar *pc = text.c_str(); *pc; pc++ )
  88     {
  89         wxChar ch = *pc;
  90         switch ( ch ) {
  91             case _T('\n'):
  92                 // Dos/Unix line termination
  93                 result += eol;
  94                 chLast = 0;
  95                 break;
  96
  97             case _T('\r'):
  98                 if ( chLast == _T('\r') ) {
  99                     // Mac empty line
 100                     result += eol;
 101                 }
 102                 else {
 103                     // just remember it: we don't know whether it is just "\r"
 104                     // or "\r\n" yet
 105                     chLast = _T('\r');
 106                 }
 107                 break;
 108
 109             default:
 110                 if ( chLast == _T('\r') ) {
 111                     // Mac line termination
 112                     result += eol;
 113
 114                     // reset chLast to avoid inserting another eol before the
 115                     // next character
 116                     chLast = 0;
 117                 }
 118
 119                 // add to the current line
 120                 result += ch;
 121         }
 122     }
 123
 124     if ( chLast ) {
 125         // trailing '\r'
 126         result += eol;
 127     }
 128
 129     return result;
 130 }
 131
 132 #if wxUSE_TEXTBUFFER
 133
 134 // ----------------------------------------------------------------------------
 135 // ctors & dtor
 136 // ----------------------------------------------------------------------------
 137
 138 wxTextBuffer::wxTextBuffer(const wxString& strBufferName)
 139             : m_strBufferName(strBufferName)
 140 {
 141     m_nCurLine = 0;
 142     m_isOpened = false;
 143 }
 144
 145 wxTextBuffer::~wxTextBuffer()
 146 {
 147     // required here for Darwin
 148 }
 149
 150 // ----------------------------------------------------------------------------
 151 // buffer operations
 152 // ----------------------------------------------------------------------------
 153
 154 bool wxTextBuffer::Exists() const
 155 {
 156     return OnExists();
 157 }
 158
 159 bool wxTextBuffer::Create(const wxString& strBufferName)
 160 {
 161     m_strBufferName = strBufferName;
 162
 163     return Create();
 164 }
 165
 166 bool wxTextBuffer::Create()
 167 {
 168     // buffer name must be either given in ctor or in Create(const wxString&)
 169     wxASSERT( !m_strBufferName.empty() );
 170
 171     // if the buffer already exists do nothing
 172     if ( Exists() ) return false;
 173
 174     if ( !OnOpen(m_strBufferName, WriteAccess) )
 175         return false;
 176
 177     OnClose();
 178     return true;
 179 }
 180
 181 bool wxTextBuffer::Open(const wxString& strBufferName, wxMBConv& conv)
 182 {
 183     m_strBufferName = strBufferName;
 184
 185     return Open(conv);
 186 }
 187
 188 bool wxTextBuffer::Open(wxMBConv& conv)
 189 {
 190     // buffer name must be either given in ctor or in Open(const wxString&)
 191     wxASSERT( !m_strBufferName.empty() );
 192
 193     // open buffer in read-only mode
 194     if ( !OnOpen(m_strBufferName, ReadAccess) )
 195         return false;
 196
 197     // read buffer into memory
 198     m_isOpened = OnRead(conv);
 199
 200     OnClose();
 201
 202     return m_isOpened;
 203 }
 204
 205 // analyse some lines of the buffer trying to guess it's type.
 206 // if it fails, it assumes the native type for our platform.
 207 wxTextFileType wxTextBuffer::GuessType() const
 208 {
 209     wxASSERT( IsOpened() );
 210
 211     // scan the buffer lines
 212     size_t nUnix = 0,     // number of '\n's alone
 213            nDos  = 0,     // number of '\r\n'
 214            nMac  = 0;     // number of '\r's
 215
 216     // we take MAX_LINES_SCAN in the beginning, middle and the end of buffer
 217     #define MAX_LINES_SCAN    (10)
 218     size_t nCount = m_aLines.Count() / 3,
 219         nScan =  nCount > 3*MAX_LINES_SCAN ? MAX_LINES_SCAN : nCount / 3;
 220
 221     #define   AnalyseLine(n)              \
 222         switch ( m_aTypes[n] ) {            \
 223             case wxTextFileType_Unix: nUnix++; break;   \
 224             case wxTextFileType_Dos:  nDos++;  break;   \
 225             case wxTextFileType_Mac:  nMac++;  break;   \
 226             default: wxFAIL_MSG(_("unknown line terminator")); \
 227         }
 228
 229     size_t n;
 230     for ( n = 0; n < nScan; n++ )     // the beginning
 231         AnalyseLine(n);
 232     for ( n = (nCount - nScan)/2; n < (nCount + nScan)/2; n++ )
 233         AnalyseLine(n);
 234     for ( n = nCount - nScan; n < nCount; n++ )
 235         AnalyseLine(n);
 236
 237     #undef   AnalyseLine
 238
 239     // interpret the results (FIXME far from being even 50% fool proof)
 240     if ( nScan > 0 && nDos + nUnix + nMac == 0 ) {
 241         // no newlines at all
 242         wxLogWarning(_("'%s' is probably a binary buffer."), m_strBufferName.c_str());
 243     }
 244     else {
 245         #define   GREATER_OF(t1, t2) n##t1 == n##t2 ? typeDefault               \
 246                                                 : n##t1 > n##t2             \
 247                                                     ? wxTextFileType_##t1   \
 248                                                     : wxTextFileType_##t2
 249
 250         // Watcom C++ doesn't seem to be able to handle the macro
 251         // VS: Watcom 11 doesn't have a problem...
 252 #if !(defined(__WATCOMC__) && (__WATCOMC__ < 1100))
 253         if ( nDos > nUnix )
 254             return GREATER_OF(Dos, Mac);
 255         else if ( nDos < nUnix )
 256             return GREATER_OF(Unix, Mac);
 257         else {
 258             // nDos == nUnix
 259             return nMac > nDos ? wxTextFileType_Mac : typeDefault;
 260         }
 261 #endif // __WATCOMC__
 262
 263         #undef    GREATER_OF
 264     }
 265
 266     return typeDefault;
 267 }
 268
 269
 270 bool wxTextBuffer::Close()
 271 {
 272     m_aTypes.Clear();
 273     m_aLines.Clear();
 274     m_nCurLine = 0;
 275     m_isOpened = false;
 276
 277     return true;
 278 }
 279
 280 bool wxTextBuffer::Write(wxTextFileType typeNew, wxMBConv& conv)
 281 {
 282     return OnWrite(typeNew, conv);
 283 }
 284
 285 #endif // wxUSE_TEXTBUFFER
 286