include/wx/textfile.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        textfile.h
   3 // Purpose:     class wxTextFile to work with text files of _small_ size
   4 //              (file is fully loaded in memory) and which understands CR/LF
   5 //              differences between platforms.
   6 // Author:      Vadim Zeitlin
   7 // Modified by:
   8 // Created:     03.04.98
   9 // RCS-ID:      $Id$
  10 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
  11 // Licence:     wxWindows license
  12 ///////////////////////////////////////////////////////////////////////////////
  13
  14 #ifndef   _TEXTFILE_H
  15 #define   _TEXTFILE_H
  16
  17 #ifdef __GNUG__
  18 #pragma interface "textfile.h"
  19 #endif
  20
  21 #include "wx/defs.h"
  22 #include "wx/string.h"
  23 #include "wx/file.h"
  24 #include "wx/dynarray.h"
  25
  26 // ----------------------------------------------------------------------------
  27 // wxTextFile
  28 // ----------------------------------------------------------------------------
  29
  30 // the line termination type
  31 enum wxTextFileType
  32 {
  33     wxTextFileType_None,  // incomplete (the last line of the file only)
  34     wxTextFileType_Unix,  // line is terminated with 'LF' = 0xA = 10 = '\n'
  35     wxTextFileType_Dos,   //                         'CR' 'LF'
  36     wxTextFileType_Mac    //                         'CR' = 0xD = 13 = '\r'
  37 };
  38
  39 WX_DEFINE_ARRAY(wxTextFileType, ArrayFileType);
  40
  41 class wxTextFile
  42 {
  43 public:
  44   // default type for current platform (determined at compile time)
  45   static const wxTextFileType typeDefault;
  46
  47   // ctors
  48     // def ctor, use Open(string)
  49   wxTextFile() { }
  50     //
  51   wxTextFile(const wxString& strFile);
  52
  53   // file operations
  54     // file exists?
  55   bool Exists() const;
  56     // Open() also loads file in memory on success
  57   bool Open();
  58     // same as Open() but with (another) file name
  59   bool Open(const wxString& strFile);
  60     // closes the file and frees memory, losing all changes
  61   bool Close();
  62     // is file currently opened?
  63   bool IsOpened() const { return m_file.IsOpened(); }
  64
  65   // accessors
  66     // get the number of lines in the file
  67   size_t GetLineCount() const { return m_aLines.Count(); }
  68     // the returned line may be modified (but don't add CR/LF at the end!)
  69   wxString& GetLine(size_t n)    const { return m_aLines[n]; }
  70   wxString& operator[](size_t n) const { return m_aLines[n]; }
  71
  72     // the current line has meaning only when you're using
  73     // GetFirstLine()/GetNextLine() functions, it doesn't get updated when
  74     // you're using "direct access" i.e. GetLine()
  75   size_t GetCurrentLine() const { return m_nCurLine; }
  76   void GoToLine(size_t n) { m_nCurLine = n; }
  77   bool Eof() const { return m_nCurLine == m_aLines.Count() - 1; }
  78
  79     // these methods allow more "iterator-like" traversal of the list of
  80     // lines, i.e. you may write something like:
  81     //  for ( str = GetFirstLine(); !Eof(); str = GetNextLine() ) { ... }
  82
  83     // NB: const is commented out because not all compilers understand
  84     //     'mutable' keyword yet (m_nCurLine should be mutable)
  85   wxString& GetFirstLine() /* const */ { return m_aLines[m_nCurLine = 0]; }
  86   wxString& GetNextLine()  /* const */ { return m_aLines[++m_nCurLine];   }
  87   wxString& GetPrevLine()  /* const */
  88     { wxASSERT(m_nCurLine > 0); return m_aLines[--m_nCurLine];   }
  89   wxString& GetLastLine() /* const */
  90     { return m_aLines[m_nCurLine = m_aLines.Count() - 1]; }
  91
  92     // get the type of the line (see also GetEOL)
  93   wxTextFileType GetLineType(size_t n) const { return m_aTypes[n]; }
  94     // guess the type of file (m_file is supposed to be opened)
  95   wxTextFileType GuessType() const;
  96     // get the name of the file
  97   const wxChar *GetName() const { return m_strFile.c_str(); }
  98
  99   // add/remove lines
 100     // add a line to the end
 101   void AddLine(const wxString& str, wxTextFileType type = typeDefault)
 102     { m_aLines.Add(str); m_aTypes.Add(type); }
 103     // insert a line before the line number n
 104   void InsertLine(const wxString& str,
 105                   size_t n,
 106                   wxTextFileType type = typeDefault)
 107     { m_aLines.Insert(str, n); m_aTypes.Insert(type, n); }
 108     // delete one line
 109   void RemoveLine(size_t n) { m_aLines.Remove(n); m_aTypes.Remove(n); }
 110
 111   // change the file on disk (default argument means "don't change type")
 112   // possibly in another format
 113   bool Write(wxTextFileType typeNew = wxTextFileType_None);
 114
 115   // get the file termination string
 116   // Note: implementation moved to textfile to prevent warning due to switch.
 117   static const wxChar *GetEOL(wxTextFileType type = typeDefault);
 118
 119   // dtor
 120   ~wxTextFile();
 121
 122 private:
 123   // copy ctor/assignment operator not implemented
 124   wxTextFile(const wxTextFile&);
 125   wxTextFile& operator=(const wxTextFile&);
 126
 127   // read the file in memory (m_file is supposed to be just opened)
 128   bool Read();
 129
 130   wxFile        m_file;     // current file
 131
 132   ArrayFileType m_aTypes;   // type of each line
 133   wxArrayString m_aLines;   // lines of file
 134
 135   size_t        m_nCurLine; // number of current line in the file
 136
 137   wxString      m_strFile;  // name of the file
 138 };
 139
 140 #endif  //_TEXTFILE_H