include/wx/textbuf.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/textbuf.h
   3 // Purpose:     class wxTextBuffer to work with text buffers of _small_ size
   4 //              (buffer is fully loaded in memory) and which understands CR/LF
   5 //              differences between platforms.
   6 // Created:     14.11.01
   7 // Author:      Morten Hanssen, Vadim Zeitlin
   8 // Copyright:   (c) 1998-2001 Morten Hanssen, Vadim Zeitlin
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_TEXTBUFFER_H
  13 #define _WX_TEXTBUFFER_H
  14
  15 #include "wx/defs.h"
  16 #include "wx/arrstr.h"
  17 #include "wx/convauto.h"
  18
  19 // ----------------------------------------------------------------------------
  20 // constants
  21 // ----------------------------------------------------------------------------
  22
  23 // the line termination type (kept wxTextFileType name for compability)
  24 enum wxTextFileType
  25 {
  26     wxTextFileType_None,  // incomplete (the last line of the file only)
  27     wxTextFileType_Unix,  // line is terminated with 'LF' = 0xA = 10 = '\n'
  28     wxTextFileType_Dos,   //                         'CR' 'LF'
  29     wxTextFileType_Mac,   //                         'CR' = 0xD = 13 = '\r'
  30     wxTextFileType_Os2    //                         'CR' 'LF'
  31 };
  32
  33 #include "wx/string.h"
  34
  35 #if wxUSE_TEXTBUFFER
  36
  37 #include "wx/dynarray.h"
  38
  39 // ----------------------------------------------------------------------------
  40 // wxTextBuffer
  41 // ----------------------------------------------------------------------------
  42
  43 WX_DEFINE_USER_EXPORTED_ARRAY_INT(wxTextFileType,
  44                                   wxArrayLinesType,
  45                                   class WXDLLIMPEXP_BASE);
  46
  47 #endif // wxUSE_TEXTBUFFER
  48
  49 class WXDLLIMPEXP_BASE wxTextBuffer
  50 {
  51 public:
  52     // constants and static functions
  53     // default type for current platform (determined at compile time)
  54     static const wxTextFileType typeDefault;
  55
  56     // this function returns a string which is identical to "text" passed in
  57     // except that the line terminator characters are changed to correspond the
  58     // given type. Called with the default argument, the function translates
  59     // the string to the native format (Unix for Unix, DOS for Windows, ...).
  60     static wxString Translate(const wxString& text,
  61                             wxTextFileType type = typeDefault);
  62
  63     // get the buffer termination string
  64     static const wxChar *GetEOL(wxTextFileType type = typeDefault);
  65
  66     // the static methods of this class are compiled in even when
  67     // !wxUSE_TEXTBUFFER because they are used by the library itself, but the
  68     // rest can be left out
  69 #if wxUSE_TEXTBUFFER
  70
  71     // buffer operations
  72     // -----------------
  73
  74     // buffer exists?
  75     bool Exists() const;
  76
  77     // create the buffer if it doesn't already exist
  78     bool Create();
  79
  80     // same as Create() but with (another) buffer name
  81     bool Create(const wxString& strBufferName);
  82
  83     // Open() also loads buffer in memory on success
  84     bool Open(const wxMBConv& conv = wxConvAuto());
  85
  86     // same as Open() but with (another) buffer name
  87     bool Open(const wxString& strBufferName, const wxMBConv& conv = wxConvAuto());
  88
  89     // closes the buffer and frees memory, losing all changes
  90     bool Close();
  91
  92     // is buffer currently opened?
  93     bool IsOpened() const { return m_isOpened; }
  94
  95     // accessors
  96     // ---------
  97
  98     // get the number of lines in the buffer
  99     size_t GetLineCount() const { return m_aLines.size(); }
 100
 101     // the returned line may be modified (but don't add CR/LF at the end!)
 102     wxString& GetLine(size_t n)    const { return (wxString&)m_aLines[n]; }
 103     wxString& operator[](size_t n) const { return (wxString&)m_aLines[n]; }
 104
 105     // the current line has meaning only when you're using
 106     // GetFirstLine()/GetNextLine() functions, it doesn't get updated when
 107     // you're using "direct access" i.e. GetLine()
 108     size_t GetCurrentLine() const { return m_nCurLine; }
 109     void GoToLine(size_t n) { m_nCurLine = n; }
 110     bool Eof() const { return m_nCurLine == m_aLines.size(); }
 111
 112     // these methods allow more "iterator-like" traversal of the list of
 113     // lines, i.e. you may write something like:
 114     //  for ( str = GetFirstLine(); !Eof(); str = GetNextLine() ) { ... }
 115
 116     // NB: const is commented out because not all compilers understand
 117     //     'mutable' keyword yet (m_nCurLine should be mutable)
 118     wxString& GetFirstLine() /* const */
 119         { return m_aLines.empty() ? ms_eof : m_aLines[m_nCurLine = 0]; }
 120     wxString& GetNextLine()  /* const */
 121         { return ++m_nCurLine == m_aLines.size() ? ms_eof
 122                                                  : m_aLines[m_nCurLine]; }
 123     wxString& GetPrevLine()  /* const */
 124         { wxASSERT(m_nCurLine > 0); return m_aLines[--m_nCurLine]; }
 125     wxString& GetLastLine() /* const */
 126         { m_nCurLine = m_aLines.size() - 1; return m_aLines.Last(); }
 127
 128     // get the type of the line (see also GetEOL)
 129     wxTextFileType GetLineType(size_t n) const { return m_aTypes[n]; }
 130
 131     // guess the type of buffer
 132     wxTextFileType GuessType() const;
 133
 134     // get the name of the buffer
 135     const wxString& GetName() const { return m_strBufferName; }
 136
 137     // add/remove lines
 138     // ----------------
 139
 140     // add a line to the end
 141     void AddLine(const wxString& str, wxTextFileType type = typeDefault)
 142         { m_aLines.push_back(str); m_aTypes.push_back(type); }
 143     // insert a line before the line number n
 144     void InsertLine(const wxString& str,
 145                   size_t n,
 146                   wxTextFileType type = typeDefault)
 147     {
 148         m_aLines.insert(m_aLines.begin() + n, str);
 149         m_aTypes.insert(m_aTypes.begin()+n, type);
 150     }
 151
 152     // delete one line
 153     void RemoveLine(size_t n)
 154     {
 155         m_aLines.erase(m_aLines.begin() + n);
 156         m_aTypes.erase(m_aTypes.begin() + n);
 157     }
 158
 159     // remove all lines
 160     void Clear() { m_aLines.clear(); m_aTypes.clear(); m_nCurLine = 0; }
 161
 162     // change the buffer (default argument means "don't change type")
 163     // possibly in another format
 164     bool Write(wxTextFileType typeNew = wxTextFileType_None,
 165                const wxMBConv& conv = wxConvAuto());
 166
 167     // dtor
 168     virtual ~wxTextBuffer();
 169
 170 protected:
 171     // ctors
 172     // -----
 173
 174     // default ctor, use Open(string)
 175     wxTextBuffer() { m_isOpened = false; }
 176
 177     // ctor from filename
 178     wxTextBuffer(const wxString& strBufferName);
 179
 180     enum wxTextBufferOpenMode { ReadAccess, WriteAccess };
 181
 182     // Must implement these in derived classes.
 183     virtual bool OnExists() const = 0;
 184     virtual bool OnOpen(const wxString &strBufferName,
 185                         wxTextBufferOpenMode openmode) = 0;
 186     virtual bool OnClose() = 0;
 187     virtual bool OnRead(const wxMBConv& conv) = 0;
 188     virtual bool OnWrite(wxTextFileType typeNew, const wxMBConv& conv) = 0;
 189
 190     static wxString ms_eof;     // dummy string returned at EOF
 191     wxString m_strBufferName;   // name of the buffer
 192
 193 private:
 194     wxArrayLinesType m_aTypes;   // type of each line
 195     wxArrayString    m_aLines;   // lines of file
 196
 197     size_t        m_nCurLine; // number of current line in the buffer
 198
 199     bool          m_isOpened; // was the buffer successfully opened the last time?
 200 #endif // wxUSE_TEXTBUFFER
 201
 202     // copy ctor/assignment operator not implemented
 203     wxTextBuffer(const wxTextBuffer&);
 204     wxTextBuffer& operator=(const wxTextBuffer&);
 205 };
 206
 207 #endif // _WX_TEXTBUFFER_H
 208