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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 aviod
84 // unnecessary relocations
85 result.Alloc(text.Len());
86
87 wxChar chLast = 0;
88 for ( const wxChar *pc = text.c_str(); *pc; pc++ )
89 {
90 wxChar ch = *pc;
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 // ----------------------------------------------------------------------------
136 // ctors & dtor
137 // ----------------------------------------------------------------------------
138
139 wxTextBuffer::wxTextBuffer(const wxString& strBufferName)
140 : m_strBufferName(strBufferName)
141 {
142 m_nCurLine = 0;
143 m_isOpened = false;
144 }
145
146 wxTextBuffer::~wxTextBuffer()
147 {
148 // required here for Darwin
149 }
150
151 // ----------------------------------------------------------------------------
152 // buffer operations
153 // ----------------------------------------------------------------------------
154
155 bool wxTextBuffer::Exists() const
156 {
157 return OnExists();
158 }
159
160 bool wxTextBuffer::Create(const wxString& strBufferName)
161 {
162 m_strBufferName = strBufferName;
163
164 return Create();
165 }
166
167 bool wxTextBuffer::Create()
168 {
169 // buffer name must be either given in ctor or in Create(const wxString&)
170 wxASSERT( !m_strBufferName.empty() );
171
172 // if the buffer already exists do nothing
173 if ( Exists() ) return false;
174
175 if ( !OnOpen(m_strBufferName, WriteAccess) )
176 return false;
177
178 OnClose();
179 return true;
180 }
181
182 bool wxTextBuffer::Open(const wxString& strBufferName, wxMBConv& conv)
183 {
184 m_strBufferName = strBufferName;
185
186 return Open(conv);
187 }
188
189 bool wxTextBuffer::Open(wxMBConv& conv)
190 {
191 // buffer name must be either given in ctor or in Open(const wxString&)
192 wxASSERT( !m_strBufferName.empty() );
193
194 // open buffer in read-only mode
195 if ( !OnOpen(m_strBufferName, ReadAccess) )
196 return false;
197
198 // read buffer into memory
199 m_isOpened = OnRead(conv);
200
201 OnClose();
202
203 return m_isOpened;
204 }
205
206 // analyse some lines of the buffer trying to guess it's type.
207 // if it fails, it assumes the native type for our platform.
208 wxTextFileType wxTextBuffer::GuessType() const
209 {
210 wxASSERT( IsOpened() );
211
212 // scan the buffer lines
213 size_t nUnix = 0, // number of '\n's alone
214 nDos = 0, // number of '\r\n'
215 nMac = 0; // number of '\r's
216
217 // we take MAX_LINES_SCAN in the beginning, middle and the end of buffer
218 #define MAX_LINES_SCAN (10)
219 size_t nCount = m_aLines.Count() / 3,
220 nScan = nCount > 3*MAX_LINES_SCAN ? MAX_LINES_SCAN : nCount / 3;
221
222 #define AnalyseLine(n) \
223 switch ( m_aTypes[n] ) { \
224 case wxTextFileType_Unix: nUnix++; break; \
225 case wxTextFileType_Dos: nDos++; break; \
226 case wxTextFileType_Mac: nMac++; break; \
227 default: wxFAIL_MSG(_("unknown line terminator")); \
228 }
229
230 size_t n;
231 for ( n = 0; n < nScan; n++ ) // the beginning
232 AnalyseLine(n);
233 for ( n = (nCount - nScan)/2; n < (nCount + nScan)/2; n++ )
234 AnalyseLine(n);
235 for ( n = nCount - nScan; n < nCount; n++ )
236 AnalyseLine(n);
237
238 #undef AnalyseLine
239
240 // interpret the results (FIXME far from being even 50% fool proof)
241 if ( nScan > 0 && nDos + nUnix + nMac == 0 ) {
242 // no newlines at all
243 wxLogWarning(_("'%s' is probably a binary buffer."), m_strBufferName.c_str());
244 }
245 else {
246 #define GREATER_OF(t1, t2) n##t1 == n##t2 ? typeDefault \
247 : n##t1 > n##t2 \
248 ? wxTextFileType_##t1 \
249 : wxTextFileType_##t2
250
251 #if !defined(__WATCOMC__) || wxCHECK_WATCOM_VERSION(1,4)
252 if ( nDos > nUnix )
253 return GREATER_OF(Dos, Mac);
254 else if ( nDos < nUnix )
255 return GREATER_OF(Unix, Mac);
256 else {
257 // nDos == nUnix
258 return nMac > nDos ? wxTextFileType_Mac : typeDefault;
259 }
260 #endif // __WATCOMC__
261
262 #undef GREATER_OF
263 }
264
265 return typeDefault;
266 }
267
268
269 bool wxTextBuffer::Close()
270 {
271 m_aTypes.Clear();
272 m_aLines.Clear();
273 m_nCurLine = 0;
274 m_isOpened = false;
275
276 return true;
277 }
278
279 bool wxTextBuffer::Write(wxTextFileType typeNew, wxMBConv& conv)
280 {
281 return OnWrite(typeNew, conv);
282 }
283
284 #endif // wxUSE_TEXTBUFFER