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 Ballueder   &  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 #include "wx/defs.h"
  17
  18 #if wxUSE_CONFIG
  19
  20 #include "wx/textfile.h"
  21 #include "wx/string.h"
  22 #include "wx/confbase.h"
  23 #include "wx/filename.h"
  24
  25 // ----------------------------------------------------------------------------
  26 // wxFileConfig
  27 // ----------------------------------------------------------------------------
  28
  29 /*
  30   wxFileConfig derives from base Config and implements file based config class,
  31   i.e. it uses ASCII disk files to store the information. These files are
  32   alternatively called INI, .conf or .rc in the documentation. They are
  33   organized in groups or sections, which can nest (i.e. a group contains
  34   subgroups, which contain their own subgroups &c). Each group has some
  35   number of entries, which are "key = value" pairs. More precisely, the format
  36   is:
  37
  38   # comments are allowed after either ';' or '#' (Win/UNIX standard)
  39
  40   # blank lines (as above) are ignored
  41
  42   # global entries are members of special (no name) top group
  43   written_for = Windows
  44   platform    = Linux
  45
  46   # the start of the group 'Foo'
  47   [Foo]                           # may put comments like this also
  48   # following 3 lines are entries
  49   key = value
  50   another_key = "  strings with spaces in the beginning should be quoted, \
  51                    otherwise the spaces are lost"
  52   last_key = but you don't have to put " normally (nor quote them, like here)
  53
  54   # subgroup of the group 'Foo'
  55   # (order is not important, only the name is: separator is '/', as in paths)
  56   [Foo/Bar]
  57   # entries prefixed with "!" are immutable, i.e. can't be changed if they are
  58   # set in the system-wide config file
  59   !special_key = value
  60   bar_entry = whatever
  61
  62   [Foo/Bar/Fubar]   # depth is (theoretically :-) unlimited
  63   # may have the same name as key in another section
  64   bar_entry = whatever not
  65
  66   You have {read/write/delete}Entry functions (guess what they do) and also
  67   setCurrentPath to select current group. enum{Subgroups/Entries} allow you
  68   to get all entries in the config file (in the current group). Finally,
  69   flush() writes immediately all changed entries to disk (otherwise it would
  70   be done automatically in dtor)
  71
  72   wxFileConfig manages not less than 2 config files for each program: global
  73   and local (or system and user if you prefer). Entries are read from both of
  74   them and the local entries override the global ones unless the latter is
  75   immutable (prefixed with '!') in which case a warning message is generated
  76   and local value is ignored. Of course, the changes are always written to local
  77   file only.
  78
  79   The names of these files can be specified in a number of ways. First of all,
  80   you can use the standard convention: using the ctor which takes 'strAppName'
  81   parameter will probably be sufficient for 90% of cases. If, for whatever
  82   reason you wish to use the files with some other names, you can always use the
  83   second ctor.
  84
  85   wxFileConfig also may automatically expand the values of environment variables
  86   in the entries it reads: for example, if you have an entry
  87     score_file = $HOME/.score
  88   a call to Read(&str, "score_file") will return a complete path to .score file
  89   unless the expansion was previously disabled with SetExpandEnvVars(false) call
  90   (it's on by default, the current status can be retrieved with
  91    IsExpandingEnvVars function).
  92 */
  93 class WXDLLIMPEXP_FWD_BASE wxFileConfigGroup;
  94 class WXDLLIMPEXP_FWD_BASE wxFileConfigEntry;
  95 class WXDLLIMPEXP_FWD_BASE wxFileConfigLineList;
  96
  97 #if wxUSE_STREAMS
  98 class WXDLLIMPEXP_FWD_BASE wxInputStream;
  99 class WXDLLIMPEXP_FWD_BASE wxOutputStream;
 100 #endif // wxUSE_STREAMS
 101
 102 class WXDLLIMPEXP_BASE wxFileConfig : public wxConfigBase
 103 {
 104 public:
 105   // construct the "standard" full name for global (system-wide) and
 106   // local (user-specific) config files from the base file name.
 107   //
 108   // the following are the filenames returned by this functions:
 109   //            global                local
 110   // Unix   /etc/file.ext           ~/.file
 111   // Win    %windir%\file.ext   %USERPROFILE%\file.ext
 112   //
 113   // where file is the basename of szFile, ext is its extension
 114   // or .conf (Unix) or .ini (Win) if it has none
 115   static wxFileName GetGlobalFile(const wxString& szFile);
 116   static wxFileName GetLocalFile(const wxString& szFile, int style = 0);
 117
 118   static wxString GetGlobalFileName(const wxString& szFile)
 119   {
 120       return GetGlobalFile(szFile).GetFullPath();
 121   }
 122
 123   static wxString GetLocalFileName(const wxString& szFile, int style = 0)
 124   {
 125       return GetLocalFile(szFile, style).GetFullPath();
 126   }
 127
 128   // ctor & dtor
 129     // New constructor: one size fits all. Specify wxCONFIG_USE_LOCAL_FILE or
 130     // wxCONFIG_USE_GLOBAL_FILE to say which files should be used.
 131   wxFileConfig(const wxString& appName = wxEmptyString,
 132                const wxString& vendorName = wxEmptyString,
 133                const wxString& localFilename = wxEmptyString,
 134                const wxString& globalFilename = wxEmptyString,
 135                long style = wxCONFIG_USE_LOCAL_FILE | wxCONFIG_USE_GLOBAL_FILE,
 136                const wxMBConv& conv = wxConvAuto());
 137
 138 #if wxUSE_STREAMS
 139     // ctor that takes an input stream.
 140   wxFileConfig(wxInputStream &inStream, const wxMBConv& conv = wxConvAuto());
 141 #endif // wxUSE_STREAMS
 142
 143     // dtor will save unsaved data
 144   virtual ~wxFileConfig();
 145
 146   // under Unix, set the umask to be used for the file creation, do nothing
 147   // under other systems
 148 #ifdef __UNIX__
 149   void SetUmask(int mode) { m_umask = mode; }
 150 #else // !__UNIX__
 151   void SetUmask(int WXUNUSED(mode)) { }
 152 #endif // __UNIX__/!__UNIX__
 153
 154   // implement inherited pure virtual functions
 155   virtual void SetPath(const wxString& strPath);
 156   virtual const wxString& GetPath() const { return m_strPath; }
 157
 158   virtual bool GetFirstGroup(wxString& str, long& lIndex) const;
 159   virtual bool GetNextGroup (wxString& str, long& lIndex) const;
 160   virtual bool GetFirstEntry(wxString& str, long& lIndex) const;
 161   virtual bool GetNextEntry (wxString& str, long& lIndex) const;
 162
 163   virtual size_t GetNumberOfEntries(bool bRecursive = false) const;
 164   virtual size_t GetNumberOfGroups(bool bRecursive = false) const;
 165
 166   virtual bool HasGroup(const wxString& strName) const;
 167   virtual bool HasEntry(const wxString& strName) const;
 168
 169   virtual bool Flush(bool bCurrentOnly = false);
 170
 171   virtual bool RenameEntry(const wxString& oldName, const wxString& newName);
 172   virtual bool RenameGroup(const wxString& oldName, const wxString& newName);
 173
 174   virtual bool DeleteEntry(const wxString& key, bool bGroupIfEmptyAlso = true);
 175   virtual bool DeleteGroup(const wxString& szKey);
 176   virtual bool DeleteAll();
 177
 178   // additional, wxFileConfig-specific, functionality
 179 #if wxUSE_STREAMS
 180   // save the entire config file text to the given stream, note that the text
 181   // won't be saved again in dtor when Flush() is called if you use this method
 182   // as it won't be "changed" any more
 183   virtual bool Save(wxOutputStream& os, const wxMBConv& conv = wxConvAuto());
 184 #endif // wxUSE_STREAMS
 185
 186 public:
 187   // functions to work with this list
 188   wxFileConfigLineList *LineListAppend(const wxString& str);
 189   wxFileConfigLineList *LineListInsert(const wxString& str,
 190                            wxFileConfigLineList *pLine);    // NULL => Prepend()
 191   void      LineListRemove(wxFileConfigLineList *pLine);
 192   bool      LineListIsEmpty();
 193
 194 protected:
 195   virtual bool DoReadString(const wxString& key, wxString *pStr) const;
 196   virtual bool DoReadLong(const wxString& key, long *pl) const;
 197 #if wxUSE_BASE64
 198   virtual bool DoReadBinary(const wxString& key, wxMemoryBuffer* buf) const;
 199 #endif // wxUSE_BASE64
 200
 201   virtual bool DoWriteString(const wxString& key, const wxString& szValue);
 202   virtual bool DoWriteLong(const wxString& key, long lValue);
 203 #if wxUSE_BASE64
 204   virtual bool DoWriteBinary(const wxString& key, const wxMemoryBuffer& buf);
 205 #endif // wxUSE_BASE64
 206
 207 private:
 208   // GetXXXFileName helpers: return ('/' terminated) directory names
 209   static wxString GetGlobalDir();
 210   static wxString GetLocalDir(int style = 0);
 211
 212   // common part of all ctors (assumes that m_str{Local|Global}File are already
 213   // initialized
 214   void Init();
 215
 216   // common part of from dtor and DeleteAll
 217   void CleanUp();
 218
 219   // parse the whole file
 220   void Parse(const wxTextBuffer& buffer, bool bLocal);
 221
 222   // the same as SetPath("/")
 223   void SetRootPath();
 224
 225   // real SetPath() implementation, returns true if path could be set or false
 226   // if path doesn't exist and createMissingComponents == false
 227   bool DoSetPath(const wxString& strPath, bool createMissingComponents);
 228
 229   // set/test the dirty flag
 230   void SetDirty() { m_isDirty = true; }
 231   void ResetDirty() { m_isDirty = false; }
 232   bool IsDirty() const { return m_isDirty; }
 233
 234
 235   // member variables
 236   // ----------------
 237   wxFileConfigLineList *m_linesHead,    // head of the linked list
 238                        *m_linesTail;    // tail
 239
 240   wxFileName  m_fnLocalFile,            // local  file name passed to ctor
 241               m_fnGlobalFile;           // global
 242   wxString    m_strPath;                // current path (not '/' terminated)
 243
 244   wxFileConfigGroup *m_pRootGroup,      // the top (unnamed) group
 245                     *m_pCurrentGroup;   // the current group
 246
 247   wxMBConv    *m_conv;
 248
 249 #ifdef __UNIX__
 250   int m_umask;                          // the umask to use for file creation
 251 #endif // __UNIX__
 252
 253   bool m_isDirty;                       // if true, we have unsaved changes
 254
 255   wxDECLARE_NO_COPY_CLASS(wxFileConfig);
 256   DECLARE_ABSTRACT_CLASS(wxFileConfig)
 257 };
 258
 259 #endif
 260   // wxUSE_CONFIG
 261
 262 #endif
 263   //_FILECONF_H
 264