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 wxWindows team
   9 // Licence:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_TEXTBUFFER_H
  13 #define _WX_TEXTBUFFER_H
  14
  15 #ifdef __GNUG__
  16     #pragma interface "textbuf.h"
  17 #endif
  18
  19 #include "wx/defs.h"
  20
  21 // ----------------------------------------------------------------------------
  22 // constants
  23 // ----------------------------------------------------------------------------
  24
  25 // the line termination type (kept wxTextFileType name for compability)
  26 enum wxTextFileType
  27 {
  28     wxTextFileType_None,  // incomplete (the last line of the file only)
  29     wxTextFileType_Unix,  // line is terminated with 'LF' = 0xA = 10 = '\n'
  30     wxTextFileType_Dos,   //                         'CR' 'LF'
  31     wxTextFileType_Mac,   //                         'CR' = 0xD = 13 = '\r'
  32     wxTextFileType_Os2    //                         'CR' 'LF'
  33 };
  34
  35 #include "wx/string.h"
  36
  37 #if wxUSE_TEXTBUFFER
  38
  39 #include "wx/dynarray.h"
  40
  41 // ----------------------------------------------------------------------------
  42 // wxTextBuffer
  43 // ----------------------------------------------------------------------------
  44
  45 WX_DEFINE_EXPORTED_ARRAY(wxTextFileType, ArrayFileType);
  46
  47 #endif // wxUSE_TEXTBUFFER
  48
  49 class WXDLLEXPORT 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(wxMBConv& conv = wxConvLibc);
  85
  86     // same as Open() but with (another) buffer name
  87     bool Open(const wxString& strBufferName, wxMBConv& conv = wxConvLibc);
  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.Count(); }
 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 m_aLines[n]; }
 103     wxString& operator[](size_t n) const { return 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_aLines.Count() == 0 || m_nCurLine == m_aLines.Count() - 1); }
 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 */ { return m_aLines[m_nCurLine = 0]; }
 119     wxString& GetNextLine()  /* const */ { return m_aLines[++m_nCurLine];   }
 120     wxString& GetPrevLine()  /* const */
 121         { wxASSERT(m_nCurLine > 0); return m_aLines[--m_nCurLine];   }
 122     wxString& GetLastLine() /* const */
 123         { return m_aLines[m_nCurLine = m_aLines.Count() - 1]; }
 124
 125     // get the type of the line (see also GetEOL)
 126     wxTextFileType GetLineType(size_t n) const { return m_aTypes[n]; }
 127
 128     // guess the type of buffer
 129     wxTextFileType GuessType() const;
 130
 131     // get the name of the buffer
 132     const wxChar *GetName() const { return m_strBufferName.c_str(); }
 133
 134     // add/remove lines
 135     // ----------------
 136
 137     // add a line to the end
 138     void AddLine(const wxString& str, wxTextFileType type = typeDefault)
 139         { m_aLines.Add(str); m_aTypes.Add(type); }
 140     // insert a line before the line number n
 141     void InsertLine(const wxString& str,
 142                   size_t n,
 143                   wxTextFileType type = typeDefault)
 144         { m_aLines.Insert(str, n); m_aTypes.Insert(type, n); }
 145     // delete one line
 146     void RemoveLine(size_t n) { m_aLines.RemoveAt(n); m_aTypes.RemoveAt(n); }
 147
 148     // change the buffer (default argument means "don't change type")
 149     // possibly in another format
 150     bool Write(wxTextFileType typeNew = wxTextFileType_None,
 151                wxMBConv& conv = wxConvLibc);
 152
 153     // dtor
 154     virtual ~wxTextBuffer();
 155
 156 protected:
 157     // ctors
 158     // -----
 159
 160     // default ctor, use Open(string)
 161     wxTextBuffer() { }
 162
 163     // ctor from filename
 164     wxTextBuffer(const wxString& strBufferName);
 165
 166     enum wxTextBufferOpenMode { ReadAccess, WriteAccess };
 167
 168     // Must implement these in derived classes.
 169     virtual bool OnExists() const = 0;
 170     virtual bool OnOpen(const wxString &strBufferName,
 171                         wxTextBufferOpenMode openmode) = 0;
 172     virtual bool OnClose() = 0;
 173     virtual bool OnRead(wxMBConv& conv) = 0;
 174     virtual bool OnWrite(wxTextFileType typeNew,
 175                         wxMBConv& conv = wxConvLibc) = 0;
 176
 177     wxString m_strBufferName;  // name of the buffer
 178
 179 private:
 180     ArrayFileType m_aTypes;   // type of each line
 181     wxArrayString m_aLines;   // lines of file
 182
 183     size_t        m_nCurLine; // number of current line in the buffer
 184
 185     bool          m_isOpened; // was the buffer successfully opened the last time?
 186 #endif // wxUSE_TEXTBUFFER
 187
 188     // copy ctor/assignment operator not implemented
 189     wxTextBuffer(const wxTextBuffer&);
 190     wxTextBuffer& operator=(const wxTextBuffer&);
 191 };
 192
 193 #endif // _WX_TEXTBUFFER_H
 194