| 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 | // RCS-ID: $Id$ |
| 7 | // Copyright: (c) 1998-2001 wxWidgets team |
| 8 | // Licence: wxWindows licence |
| 9 | /////////////////////////////////////////////////////////////////////////////// |
| 10 | |
| 11 | // ============================================================================ |
| 12 | // headers |
| 13 | // ============================================================================ |
| 14 | |
| 15 | #include "wx/wxprec.h" |
| 16 | |
| 17 | #ifdef __BORLANDC__ |
| 18 | #pragma hdrstop |
| 19 | #endif //__BORLANDC__ |
| 20 | |
| 21 | #ifndef WX_PRECOMP |
| 22 | #include "wx/string.h" |
| 23 | #include "wx/intl.h" |
| 24 | #include "wx/log.h" |
| 25 | #endif |
| 26 | |
| 27 | #include "wx/textbuf.h" |
| 28 | |
| 29 | // ============================================================================ |
| 30 | // wxTextBuffer class implementation |
| 31 | // ============================================================================ |
| 32 | |
| 33 | // ---------------------------------------------------------------------------- |
| 34 | // static methods (always compiled in) |
| 35 | // ---------------------------------------------------------------------------- |
| 36 | |
| 37 | // default type is the native one |
| 38 | // the native type under Mac OS X is: |
| 39 | // - Unix when compiling with the Apple Developer Tools (__UNIX__) |
| 40 | // - Mac when compiling with CodeWarrior (__WXMAC__) |
| 41 | |
| 42 | const wxTextFileType wxTextBuffer::typeDefault = |
| 43 | #if defined(__WINDOWS__) || defined(__DOS__) || defined(__PALMOS__) |
| 44 | wxTextFileType_Dos; |
| 45 | #elif defined(__UNIX__) |
| 46 | wxTextFileType_Unix; |
| 47 | #elif defined(__WXMAC__) |
| 48 | wxTextFileType_Mac; |
| 49 | #elif defined(__OS2__) |
| 50 | wxTextFileType_Os2; |
| 51 | #else |
| 52 | wxTextFileType_None; |
| 53 | #error "wxTextBuffer: unsupported platform." |
| 54 | #endif |
| 55 | |
| 56 | const wxChar *wxTextBuffer::GetEOL(wxTextFileType type) |
| 57 | { |
| 58 | switch ( type ) { |
| 59 | default: |
| 60 | wxFAIL_MSG(wxT("bad buffer type in wxTextBuffer::GetEOL.")); |
| 61 | // fall through nevertheless - we must return something... |
| 62 | |
| 63 | case wxTextFileType_None: return wxEmptyString; |
| 64 | case wxTextFileType_Unix: return wxT("\n"); |
| 65 | case wxTextFileType_Dos: return wxT("\r\n"); |
| 66 | case wxTextFileType_Mac: return wxT("\r"); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | wxString wxTextBuffer::Translate(const wxString& text, wxTextFileType type) |
| 71 | { |
| 72 | // don't do anything if there is nothing to do |
| 73 | if ( type == wxTextFileType_None ) |
| 74 | return text; |
| 75 | |
| 76 | // nor if it is empty |
| 77 | if ( text.empty() ) |
| 78 | return text; |
| 79 | |
| 80 | wxString eol = GetEOL(type), result; |
| 81 | |
| 82 | // optimization: we know that the length of the new string will be about |
| 83 | // the same as the length of the old one, so prealloc memory to avoid |
| 84 | // unnecessary relocations |
| 85 | result.Alloc(text.Len()); |
| 86 | |
| 87 | wxChar chLast = 0; |
| 88 | for ( wxString::const_iterator i = text.begin(); i != text.end(); ++i ) |
| 89 | { |
| 90 | wxChar ch = *i; |
| 91 | switch ( ch ) { |
| 92 | case _T('\n'): |
| 93 | // Dos/Unix line termination |
| 94 | result += eol; |
| 95 | chLast = 0; |
| 96 | break; |
| 97 | |
| 98 | case _T('\r'): |
| 99 | if ( chLast == _T('\r') ) { |
| 100 | // Mac empty line |
| 101 | result += eol; |
| 102 | } |
| 103 | else { |
| 104 | // just remember it: we don't know whether it is just "\r" |
| 105 | // or "\r\n" yet |
| 106 | chLast = _T('\r'); |
| 107 | } |
| 108 | break; |
| 109 | |
| 110 | default: |
| 111 | if ( chLast == _T('\r') ) { |
| 112 | // Mac line termination |
| 113 | result += eol; |
| 114 | |
| 115 | // reset chLast to avoid inserting another eol before the |
| 116 | // next character |
| 117 | chLast = 0; |
| 118 | } |
| 119 | |
| 120 | // add to the current line |
| 121 | result += ch; |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | if ( chLast ) { |
| 126 | // trailing '\r' |
| 127 | result += eol; |
| 128 | } |
| 129 | |
| 130 | return result; |
| 131 | } |
| 132 | |
| 133 | #if wxUSE_TEXTBUFFER |
| 134 | |
| 135 | wxString wxTextBuffer::ms_eof; |
| 136 | |
| 137 | // ---------------------------------------------------------------------------- |
| 138 | // ctors & dtor |
| 139 | // ---------------------------------------------------------------------------- |
| 140 | |
| 141 | wxTextBuffer::wxTextBuffer(const wxString& strBufferName) |
| 142 | : m_strBufferName(strBufferName) |
| 143 | { |
| 144 | m_nCurLine = 0; |
| 145 | m_isOpened = false; |
| 146 | } |
| 147 | |
| 148 | wxTextBuffer::~wxTextBuffer() |
| 149 | { |
| 150 | // required here for Darwin |
| 151 | } |
| 152 | |
| 153 | // ---------------------------------------------------------------------------- |
| 154 | // buffer operations |
| 155 | // ---------------------------------------------------------------------------- |
| 156 | |
| 157 | bool wxTextBuffer::Exists() const |
| 158 | { |
| 159 | return OnExists(); |
| 160 | } |
| 161 | |
| 162 | bool wxTextBuffer::Create(const wxString& strBufferName) |
| 163 | { |
| 164 | m_strBufferName = strBufferName; |
| 165 | |
| 166 | return Create(); |
| 167 | } |
| 168 | |
| 169 | bool wxTextBuffer::Create() |
| 170 | { |
| 171 | // buffer name must be either given in ctor or in Create(const wxString&) |
| 172 | wxASSERT( !m_strBufferName.empty() ); |
| 173 | |
| 174 | // if the buffer already exists do nothing |
| 175 | if ( Exists() ) return false; |
| 176 | |
| 177 | if ( !OnOpen(m_strBufferName, WriteAccess) ) |
| 178 | return false; |
| 179 | |
| 180 | OnClose(); |
| 181 | return true; |
| 182 | } |
| 183 | |
| 184 | bool wxTextBuffer::Open(const wxString& strBufferName, const wxMBConv& conv) |
| 185 | { |
| 186 | m_strBufferName = strBufferName; |
| 187 | |
| 188 | return Open(conv); |
| 189 | } |
| 190 | |
| 191 | bool wxTextBuffer::Open(const wxMBConv& conv) |
| 192 | { |
| 193 | // buffer name must be either given in ctor or in Open(const wxString&) |
| 194 | wxASSERT( !m_strBufferName.empty() ); |
| 195 | |
| 196 | // open buffer in read-only mode |
| 197 | if ( !OnOpen(m_strBufferName, ReadAccess) ) |
| 198 | return false; |
| 199 | |
| 200 | // read buffer into memory |
| 201 | m_isOpened = OnRead(conv); |
| 202 | |
| 203 | OnClose(); |
| 204 | |
| 205 | return m_isOpened; |
| 206 | } |
| 207 | |
| 208 | // analyse some lines of the buffer trying to guess it's type. |
| 209 | // if it fails, it assumes the native type for our platform. |
| 210 | wxTextFileType wxTextBuffer::GuessType() const |
| 211 | { |
| 212 | wxASSERT( IsOpened() ); |
| 213 | |
| 214 | // scan the buffer lines |
| 215 | size_t nUnix = 0, // number of '\n's alone |
| 216 | nDos = 0, // number of '\r\n' |
| 217 | nMac = 0; // number of '\r's |
| 218 | |
| 219 | // we take MAX_LINES_SCAN in the beginning, middle and the end of buffer |
| 220 | #define MAX_LINES_SCAN (10) |
| 221 | size_t nCount = m_aLines.GetCount() / 3, |
| 222 | nScan = nCount > 3*MAX_LINES_SCAN ? MAX_LINES_SCAN : nCount / 3; |
| 223 | |
| 224 | #define AnalyseLine(n) \ |
| 225 | switch ( m_aTypes[n] ) { \ |
| 226 | case wxTextFileType_Unix: nUnix++; break; \ |
| 227 | case wxTextFileType_Dos: nDos++; break; \ |
| 228 | case wxTextFileType_Mac: nMac++; break; \ |
| 229 | default: wxFAIL_MSG(_T("unknown line terminator")); \ |
| 230 | } |
| 231 | |
| 232 | size_t n; |
| 233 | for ( n = 0; n < nScan; n++ ) // the beginning |
| 234 | AnalyseLine(n); |
| 235 | for ( n = (nCount - nScan)/2; n < (nCount + nScan)/2; n++ ) |
| 236 | AnalyseLine(n); |
| 237 | for ( n = nCount - nScan; n < nCount; n++ ) |
| 238 | AnalyseLine(n); |
| 239 | |
| 240 | #undef AnalyseLine |
| 241 | |
| 242 | // interpret the results (FIXME far from being even 50% fool proof) |
| 243 | if ( nScan > 0 && nDos + nUnix + nMac == 0 ) { |
| 244 | // no newlines at all |
| 245 | wxLogWarning(_("'%s' is probably a binary buffer."), m_strBufferName.c_str()); |
| 246 | } |
| 247 | else { |
| 248 | #define GREATER_OF(t1, t2) n##t1 == n##t2 ? typeDefault \ |
| 249 | : n##t1 > n##t2 \ |
| 250 | ? wxTextFileType_##t1 \ |
| 251 | : wxTextFileType_##t2 |
| 252 | |
| 253 | #if !defined(__WATCOMC__) || wxCHECK_WATCOM_VERSION(1,4) |
| 254 | if ( nDos > nUnix ) |
| 255 | return GREATER_OF(Dos, Mac); |
| 256 | else if ( nDos < nUnix ) |
| 257 | return GREATER_OF(Unix, Mac); |
| 258 | else { |
| 259 | // nDos == nUnix |
| 260 | return nMac > nDos ? wxTextFileType_Mac : typeDefault; |
| 261 | } |
| 262 | #endif // __WATCOMC__ |
| 263 | |
| 264 | #undef GREATER_OF |
| 265 | } |
| 266 | |
| 267 | return typeDefault; |
| 268 | } |
| 269 | |
| 270 | |
| 271 | bool wxTextBuffer::Close() |
| 272 | { |
| 273 | Clear(); |
| 274 | m_isOpened = false; |
| 275 | |
| 276 | return true; |
| 277 | } |
| 278 | |
| 279 | bool wxTextBuffer::Write(wxTextFileType typeNew, const wxMBConv& conv) |
| 280 | { |
| 281 | return OnWrite(typeNew, conv); |
| 282 | } |
| 283 | |
| 284 | #endif // wxUSE_TEXTBUFFER |