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