include/wx/fileconf.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/fileconf.h
   3 // Purpose:     wxFileConfig derivation of wxConfigBase
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     07.04.98 (adapted from appconf.cpp)
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1997 Karsten Ballüder   &  Vadim Zeitlin
   9 //                       Ballueder@usa.net     <zeitlin@dptmaths.ens-cachan.fr>
  10 // Licence:     wxWindows licence
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 #ifndef   _FILECONF_H
  14 #define   _FILECONF_H
  15
  16 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  17 #pragma interface "fileconf.h"
  18 #endif
  19
  20 #include "wx/defs.h"
  21
  22 #if wxUSE_CONFIG
  23
  24 #include "wx/textfile.h"
  25 #include "wx/string.h"
  26 #include "wx/confbase.h"
  27
  28 // ----------------------------------------------------------------------------
  29 // wxFileConfig
  30 // ----------------------------------------------------------------------------
  31
  32 /*
  33   wxFileConfig derives from base Config and implements file based config class,
  34   i.e. it uses ASCII disk files to store the information. These files are
  35   alternatively called INI, .conf or .rc in the documentation. They are
  36   organized in groups or sections, which can nest (i.e. a group contains
  37   subgroups, which contain their own subgroups &c). Each group has some
  38   number of entries, which are "key = value" pairs. More precisely, the format
  39   is:
  40
  41   # comments are allowed after either ';' or '#' (Win/UNIX standard)
  42
  43   # blank lines (as above) are ignored
  44
  45   # global entries are members of special (no name) top group
  46   written_for = Windows
  47   platform    = Linux
  48
  49   # the start of the group 'Foo'
  50   [Foo]                           # may put comments like this also
  51   # following 3 lines are entries
  52   key = value
  53   another_key = "  strings with spaces in the beginning should be quoted, \
  54                    otherwise the spaces are lost"
  55   last_key = but you don't have to put " normally (nor quote them, like here)
  56
  57   # subgroup of the group 'Foo'
  58   # (order is not important, only the name is: separator is '/', as in paths)
  59   [Foo/Bar]
  60   # entries prefixed with "!" are immutable, i.e. can't be changed if they are
  61   # set in the system-wide config file
  62   !special_key = value
  63   bar_entry = whatever
  64
  65   [Foo/Bar/Fubar]   # depth is (theoretically :-) unlimited
  66   # may have the same name as key in another section
  67   bar_entry = whatever not
  68
  69   You have {read/write/delete}Entry functions (guess what they do) and also
  70   setCurrentPath to select current group. enum{Subgroups/Entries} allow you
  71   to get all entries in the config file (in the current group). Finally,
  72   flush() writes immediately all changed entries to disk (otherwise it would
  73   be done automatically in dtor)
  74
  75   wxFileConfig manages not less than 2 config files for each program: global
  76   and local (or system and user if you prefer). Entries are read from both of
  77   them and the local entries override the global ones unless the latter is
  78   immutable (prefixed with '!') in which case a warning message is generated
  79   and local value is ignored. Of course, the changes are always written to local
  80   file only.
  81
  82   The names of these files can be specified in a number of ways. First of all,
  83   you can use the standard convention: using the ctor which takes 'strAppName'
  84   parameter will probably be sufficient for 90% of cases. If, for whatever
  85   reason you wish to use the files with some other names, you can always use the
  86   second ctor.
  87
  88   wxFileConfig also may automatically expand the values of environment variables
  89   in the entries it reads: for example, if you have an entry
  90     score_file = $HOME/.score
  91   a call to Read(&str, "score_file") will return a complete path to .score file
  92   unless the expansion was previously disabled with SetExpandEnvVars(false) call
  93   (it's on by default, the current status can be retrieved with
  94    IsExpandingEnvVars function).
  95 */
  96 class WXDLLIMPEXP_BASE wxFileConfigGroup;
  97 class WXDLLIMPEXP_BASE wxFileConfigEntry;
  98 class WXDLLIMPEXP_BASE wxFileConfigLineList;
  99
 100 #if wxUSE_STREAMS
 101 class WXDLLIMPEXP_BASE wxInputStream;
 102 class WXDLLIMPEXP_BASE wxOutputStream;
 103 #endif // wxUSE_STREAMS
 104
 105 class WXDLLIMPEXP_BASE wxFileConfig : public wxConfigBase
 106 {
 107 public:
 108   // construct the "standard" full name for global (system-wide) and
 109   // local (user-specific) config files from the base file name.
 110   //
 111   // the following are the filenames returned by this functions:
 112   //            global                local
 113   // Unix   /etc/file.ext           ~/.file
 114   // Win    %windir%\file.ext   %USERPROFILE%\file.ext
 115   //
 116   // where file is the basename of szFile, ext is its extension
 117   // or .conf (Unix) or .ini (Win) if it has none
 118   static wxString GetGlobalFileName(const wxChar *szFile);
 119   static wxString GetLocalFileName(const wxChar *szFile);
 120
 121   // ctor & dtor
 122     // New constructor: one size fits all. Specify wxCONFIG_USE_LOCAL_FILE or
 123     // wxCONFIG_USE_GLOBAL_FILE to say which files should be used.
 124   wxFileConfig(const wxString& appName = wxEmptyString,
 125                const wxString& vendorName = wxEmptyString,
 126                const wxString& localFilename = wxEmptyString,
 127                const wxString& globalFilename = wxEmptyString,
 128                long style = wxCONFIG_USE_LOCAL_FILE | wxCONFIG_USE_GLOBAL_FILE,
 129                wxMBConv& conv = wxConvUTF8);
 130
 131 #if wxUSE_STREAMS
 132     // ctor that takes an input stream.
 133   wxFileConfig(wxInputStream &inStream, wxMBConv& conv = wxConvUTF8);
 134 #endif // wxUSE_STREAMS
 135
 136     // dtor will save unsaved data
 137   virtual ~wxFileConfig();
 138
 139   // under Unix, set the umask to be used for the file creation, do nothing
 140   // under other systems
 141 #ifdef __UNIX__
 142   void SetUmask(int mode) { m_umask = mode; }
 143 #else // !__UNIX__
 144   void SetUmask(int WXUNUSED(mode)) { }
 145 #endif // __UNIX__/!__UNIX__
 146
 147   // implement inherited pure virtual functions
 148   virtual void SetPath(const wxString& strPath);
 149   virtual const wxString& GetPath() const { return m_strPath; }
 150
 151   virtual bool GetFirstGroup(wxString& str, long& lIndex) const;
 152   virtual bool GetNextGroup (wxString& str, long& lIndex) const;
 153   virtual bool GetFirstEntry(wxString& str, long& lIndex) const;
 154   virtual bool GetNextEntry (wxString& str, long& lIndex) const;
 155
 156   virtual size_t GetNumberOfEntries(bool bRecursive = false) const;
 157   virtual size_t GetNumberOfGroups(bool bRecursive = false) const;
 158
 159   virtual bool HasGroup(const wxString& strName) const;
 160   virtual bool HasEntry(const wxString& strName) const;
 161
 162   virtual bool Flush(bool bCurrentOnly = false);
 163
 164   virtual bool RenameEntry(const wxString& oldName, const wxString& newName);
 165   virtual bool RenameGroup(const wxString& oldName, const wxString& newName);
 166
 167   virtual bool DeleteEntry(const wxString& key, bool bGroupIfEmptyAlso = true);
 168   virtual bool DeleteGroup(const wxString& szKey);
 169   virtual bool DeleteAll();
 170
 171   // additional, wxFileConfig-specific, functionality
 172 #if wxUSE_STREAMS
 173   // save the entire config file text to the given stream, note that the text
 174   // won't be saved again in dtor when Flush() is called if you use this method
 175   // as it won't be "changed" any more
 176   virtual bool Save(wxOutputStream& os, wxMBConv& conv = wxConvUTF8);
 177 #endif // wxUSE_STREAMS
 178
 179 public:
 180   // functions to work with this list
 181   wxFileConfigLineList *LineListAppend(const wxString& str);
 182   wxFileConfigLineList *LineListInsert(const wxString& str,
 183                            wxFileConfigLineList *pLine);    // NULL => Prepend()
 184   void      LineListRemove(wxFileConfigLineList *pLine);
 185   bool      LineListIsEmpty();
 186
 187 protected:
 188   virtual bool DoReadString(const wxString& key, wxString *pStr) const;
 189   virtual bool DoReadLong(const wxString& key, long *pl) const;
 190
 191   virtual bool DoWriteString(const wxString& key, const wxString& szValue);
 192   virtual bool DoWriteLong(const wxString& key, long lValue);
 193
 194 private:
 195   // GetXXXFileName helpers: return ('/' terminated) directory names
 196   static wxString GetGlobalDir();
 197   static wxString GetLocalDir();
 198
 199   // common part of all ctors (assumes that m_str{Local|Global}File are already
 200   // initialized
 201   void Init();
 202
 203   // common part of from dtor and DeleteAll
 204   void CleanUp();
 205
 206   // parse the whole file
 207   void Parse(wxTextBuffer& buffer, bool bLocal);
 208
 209   // the same as SetPath("/")
 210   void SetRootPath();
 211
 212   // set/test the dirty flag
 213   void SetDirty() { m_isDirty = true; }
 214   void ResetDirty() { m_isDirty = false; }
 215   bool IsDirty() const { return m_isDirty; }
 216
 217
 218   // member variables
 219   // ----------------
 220   wxFileConfigLineList *m_linesHead,    // head of the linked list
 221                        *m_linesTail;    // tail
 222
 223   wxString    m_strLocalFile,           // local  file name passed to ctor
 224               m_strGlobalFile;          // global
 225   wxString    m_strPath;                // current path (not '/' terminated)
 226
 227   wxFileConfigGroup *m_pRootGroup,      // the top (unnamed) group
 228                     *m_pCurrentGroup;   // the current group
 229
 230   wxMBConv   &m_conv;
 231
 232 #ifdef __UNIX__
 233   int m_umask;                          // the umask to use for file creation
 234 #endif // __UNIX__
 235
 236   bool m_isDirty;                       // if true, we have unsaved changes
 237
 238   DECLARE_NO_COPY_CLASS(wxFileConfig)
 239 };
 240
 241 #endif
 242   // wxUSE_CONFIG
 243
 244 #endif
 245   //_FILECONF_H
 246