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)          { return m_aLines[n]; }
 103     const wxString& GetLine(size_t n)    const { return m_aLines[n]; }
 104           wxString& operator[](size_t n)       { return m_aLines[n]; }
 105     const wxString& operator[](size_t n) const { return m_aLines[n]; }
 106
 107     // the current line has meaning only when you're using
 108     // GetFirstLine()/GetNextLine() functions, it doesn't get updated when
 109     // you're using "direct access" i.e. GetLine()
 110     size_t GetCurrentLine() const { return m_nCurLine; }
 111     void GoToLine(size_t n) { m_nCurLine = n; }
 112     bool Eof() const { return m_nCurLine == m_aLines.size(); }
 113
 114     // these methods allow more "iterator-like" traversal of the list of
 115     // lines, i.e. you may write something like:
 116     //  for ( str = GetFirstLine(); !Eof(); str = GetNextLine() ) { ... }
 117
 118     // NB: const is commented out because not all compilers understand
 119     //     'mutable' keyword yet (m_nCurLine should be mutable)
 120     wxString& GetFirstLine() /* const */
 121         { return m_aLines.empty() ? ms_eof : m_aLines[m_nCurLine = 0]; }
 122     wxString& GetNextLine()  /* const */
 123         { return ++m_nCurLine == m_aLines.size() ? ms_eof
 124                                                  : m_aLines[m_nCurLine]; }
 125     wxString& GetPrevLine()  /* const */
 126         { wxASSERT(m_nCurLine > 0); return m_aLines[--m_nCurLine]; }
 127     wxString& GetLastLine() /* const */
 128         { m_nCurLine = m_aLines.size() - 1; return m_aLines.Last(); }
 129
 130     // get the type of the line (see also GetEOL)
 131     wxTextFileType GetLineType(size_t n) const { return m_aTypes[n]; }
 132
 133     // guess the type of buffer
 134     wxTextFileType GuessType() const;
 135
 136     // get the name of the buffer
 137     const wxString& GetName() const { return m_strBufferName; }
 138
 139     // add/remove lines
 140     // ----------------
 141
 142     // add a line to the end
 143     void AddLine(const wxString& str, wxTextFileType type = typeDefault)
 144         { m_aLines.push_back(str); m_aTypes.push_back(type); }
 145     // insert a line before the line number n
 146     void InsertLine(const wxString& str,
 147                   size_t n,
 148                   wxTextFileType type = typeDefault)
 149     {
 150         m_aLines.insert(m_aLines.begin() + n, str);
 151         m_aTypes.insert(m_aTypes.begin()+n, type);
 152     }
 153
 154     // delete one line
 155     void RemoveLine(size_t n)
 156     {
 157         m_aLines.erase(m_aLines.begin() + n);
 158         m_aTypes.erase(m_aTypes.begin() + n);
 159     }
 160
 161     // remove all lines
 162     void Clear() { m_aLines.clear(); m_aTypes.clear(); m_nCurLine = 0; }
 163
 164     // change the buffer (default argument means "don't change type")
 165     // possibly in another format
 166     bool Write(wxTextFileType typeNew = wxTextFileType_None,
 167                const wxMBConv& conv = wxConvAuto());
 168
 169     // dtor
 170     virtual ~wxTextBuffer();
 171
 172 protected:
 173     // ctors
 174     // -----
 175
 176     // default ctor, use Open(string)
 177     wxTextBuffer() { m_nCurLine = 0; m_isOpened = false; }
 178
 179     // ctor from filename
 180     wxTextBuffer(const wxString& strBufferName);
 181
 182     enum wxTextBufferOpenMode { ReadAccess, WriteAccess };
 183
 184     // Must implement these in derived classes.
 185     virtual bool OnExists() const = 0;
 186     virtual bool OnOpen(const wxString &strBufferName,
 187                         wxTextBufferOpenMode openmode) = 0;
 188     virtual bool OnClose() = 0;
 189     virtual bool OnRead(const wxMBConv& conv) = 0;
 190     virtual bool OnWrite(wxTextFileType typeNew, const wxMBConv& conv) = 0;
 191
 192     static wxString ms_eof;     // dummy string returned at EOF
 193     wxString m_strBufferName;   // name of the buffer
 194
 195 private:
 196     wxArrayLinesType m_aTypes;   // type of each line
 197     wxArrayString    m_aLines;   // lines of file
 198
 199     size_t        m_nCurLine; // number of current line in the buffer
 200
 201     bool          m_isOpened; // was the buffer successfully opened the last time?
 202 #endif // wxUSE_TEXTBUFFER
 203
 204     // copy ctor/assignment operator not implemented
 205     wxTextBuffer(const wxTextBuffer&);
 206     wxTextBuffer& operator=(const wxTextBuffer&);
 207 };
 208
 209 #endif // _WX_TEXTBUFFER_H
 210