1 ///////////////////////////////////////////////////////////////////////////////
2 // Name: src/common/textbuf.cpp
3 // Purpose: implementation of wxTextBuffer class
5 // Author: Morten Hanssen, Vadim Zeitlin
6 // Copyright: (c) 1998-2001 wxWindows team
7 // Licence: wxWindows license
8 ///////////////////////////////////////////////////////////////////////////////
10 // ============================================================================
12 // ============================================================================
15 #pragma implementation "textbuf.h"
18 #include "wx/wxprec.h"
25 #include "wx/string.h"
30 #include "wx/textbuf.h"
32 // ============================================================================
33 // wxTextBuffer class implementation
34 // ============================================================================
36 // ----------------------------------------------------------------------------
37 // static methods (always compiled in)
38 // ----------------------------------------------------------------------------
40 // default type is the native one
41 // the native type under Mac OS X is:
42 // - Unix when compiling with the Apple Developer Tools (__UNIX__)
43 // - Mac when compiling with CodeWarrior (__WXMAC__)
45 const wxTextFileType wxTextBuffer::typeDefault =
46 #if defined(__WINDOWS__) || defined(__DOS__)
48 #elif defined(__UNIX__)
50 #elif defined(__WXMAC__)
52 #elif defined(__WXPM__)
56 #error "wxTextBuffer: unsupported platform."
59 const wxChar *wxTextBuffer::GetEOL(wxTextFileType type)
63 wxFAIL_MSG(wxT("bad buffer type in wxTextBuffer::GetEOL."));
64 // fall through nevertheless - we must return something...
66 case wxTextFileType_None: return wxT("");
67 case wxTextFileType_Unix: return wxT("\n");
68 case wxTextFileType_Dos: return wxT("\r\n");
69 case wxTextFileType_Mac: return wxT("\r");
73 wxString wxTextBuffer::Translate(const wxString& text, wxTextFileType type)
75 // don't do anything if there is nothing to do
76 if ( type == wxTextFileType_None )
83 wxString eol = GetEOL(type), result;
85 // optimization: we know that the length of the new string will be about
86 // the same as the length of the old one, so prealloc memory to aviod
87 // unnecessary relocations
88 result.Alloc(text.Len());
91 for ( const wxChar *pc = text.c_str(); *pc; pc++ )
96 // Dos/Unix line termination
102 if ( chLast == _T('\r') ) {
107 // just remember it: we don't know whether it is just "\r"
114 if ( chLast == _T('\r') ) {
115 // Mac line termination
118 // reset chLast to avoid inserting another eol before the
123 // add to the current line
138 // ----------------------------------------------------------------------------
140 // ----------------------------------------------------------------------------
142 wxTextBuffer::wxTextBuffer(const wxString& strBufferName)
143 : m_strBufferName(strBufferName)
149 wxTextBuffer::~wxTextBuffer()
153 // ----------------------------------------------------------------------------
155 // ----------------------------------------------------------------------------
157 bool wxTextBuffer::Exists() const
162 bool wxTextBuffer::Create(const wxString& strBufferName)
164 m_strBufferName = strBufferName;
169 bool wxTextBuffer::Create()
171 // buffer name must be either given in ctor or in Create(const wxString&)
172 wxASSERT( !m_strBufferName.IsEmpty() );
174 // if the buffer already exists do nothing
175 if ( Exists() ) return FALSE;
177 if ( !OnOpen(m_strBufferName, WriteAccess) )
184 bool wxTextBuffer::Open(const wxString& strBufferName, wxMBConv& conv)
186 m_strBufferName = strBufferName;
191 bool wxTextBuffer::Open(wxMBConv& conv)
193 // buffer name must be either given in ctor or in Open(const wxString&)
194 wxASSERT( !m_strBufferName.IsEmpty() );
196 // open buffer in read-only mode
197 if ( !OnOpen(m_strBufferName, ReadAccess) )
200 // read buffer into memory
201 m_isOpened = OnRead(conv);
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
212 wxASSERT( IsOpened() );
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
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.Count() / 3,
222 nScan = nCount > 3*MAX_LINES_SCAN ? MAX_LINES_SCAN : nCount / 3;
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(_("unknown line terminator")); \
233 for ( n = 0; n < nScan; n++ ) // the beginning
235 for ( n = (nCount - nScan)/2; n < (nCount + nScan)/2; n++ )
237 for ( n = nCount - nScan; n < nCount; n++ )
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());
248 #define GREATER_OF(t1, t2) n##t1 == n##t2 ? typeDefault \
250 ? wxTextFileType_##t1 \
251 : wxTextFileType_##t2
253 // Watcom C++ doesn't seem to be able to handle the macro
254 // VS: Watcom 11 doesn't have a problem...
255 #if !(defined(__WATCOMC__) && (__WATCOMC__ < 1100))
257 return GREATER_OF(Dos, Mac);
258 else if ( nDos < nUnix )
259 return GREATER_OF(Unix, Mac);
262 return nMac > nDos ? wxTextFileType_Mac : typeDefault;
264 #endif // __WATCOMC__
273 bool wxTextBuffer::Close()
283 bool wxTextBuffer::Write(wxTextFileType typeNew, wxMBConv& conv)
285 return OnWrite(typeNew, conv);
288 #endif // wxUSE_TEXTBUFFER