270 lines
10 KiB
C
270 lines
10 KiB
C
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/*****************************************************************************\
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* Project: CppLib: C++ library for Windows/UNIX platfroms *
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* File: fileconf.h - file based implementation of Config *
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*---------------------------------------------------------------------------*
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* Language: C++ *
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* Platfrom: Any *
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*---------------------------------------------------------------------------*
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* Classes: *
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*---------------------------------------------------------------------------*
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* Author: Vadim Zeitlin zeitlin@dptmaths.ens-cachan.fr> *
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* adapted from earlier class by VZ & Karsten Ball<EFBFBD>der *
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* History: *
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* 27.04.98 created *
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\*****************************************************************************/
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#ifndef _FILECONF_H
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#define _FILECONF_H
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// ----------------------------------------------------------------------------
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// wxFileConfig
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// ----------------------------------------------------------------------------
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/*
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wxFileConfig derives from base Config and implements file based config class,
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i.e. it uses ASCII disk files to store the information. These files are
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alternatively called INI, .conf or .rc in the documentation. They are
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organized in groups or sections, which can nest (i.e. a group contains
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subgroups, which contain their own subgroups &c). Each group has some
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number of entries, which are "key = value" pairs. More precisely, the format
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is:
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# comments are allowed after either ';' or '#' (Win/UNIX standard)
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# blank lines (as above) are ignored
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# global entries are members of special (no name) top group
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written_for = Windows
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platform = Linux
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# the start of the group 'Foo'
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[Foo] # may put comments like this also
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# following 3 lines are entries
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key = value
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another_key = " strings with spaces in the beginning should be quoted, \
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otherwise the spaces are lost"
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last_key = but you don't have to put " normally (nor quote them, like here)
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# subgroup of the group 'Foo'
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# (order is not important, only the name is: separator is '/', as in paths)
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[Foo/Bar]
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# entries prefixed with "!" are immutable, i.e. can't be changed if they are
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# set in the system-wide config file
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!special_key = value
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bar_entry = whatever
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[Foo/Bar/Fubar] # depth is (theoretically :-) unlimited
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# may have the same name as key in another section
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bar_entry = whatever not
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You have {read/write/delete}Entry functions (guess what they do) and also
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setCurrentPath to select current group. enum{Subgroups/Entries} allow you
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to get all entries in the config file (in the current group). Finally,
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flush() writes immediately all changed entries to disk (otherwise it would
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be done automatically in dtor)
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wxFileConfig manages not less than 2 config files for each program: global
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and local (or system and user if you prefer). Entries are read from both of
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them and the local entries override the global ones unless the latter is
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immutable (prefixed with '!') in which case a warning message is generated
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and local value is ignored. Of course, the changes are always written to local
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file only.
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@@@@ describe environment variable expansion
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*/
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class wxFileConfig : public wxConfig
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{
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public:
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// construct the "standard" full name for global (system-wide) and
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// local (user-specific) config files from the base file name.
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//
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// the following are the filenames returned by this functions:
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// global local
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// Unix /etc/file.ext ~/.file
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// Win %windir%\file.ext %USERPROFILE%\file.ext
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//
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// where file is the basename of szFile, ext is it's extension
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// or .conf (Unix) or .ini (Win) if it has none
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static wxString GetGlobalFileName(const char *szFile);
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static wxString GetLocalFileName(const char *szFile);
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// ctor & dtor
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// if strGlobal is empty, only local config file is used
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wxFileConfig(const wxString& strLocal,
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const wxString& strGlobal = "");
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// dtor will save unsaved data
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virtual ~wxFileConfig();
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// implement inherited pure virtual functions
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virtual void SetPath(const wxString& strPath);
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virtual const wxString& GetPath() const { return m_strPath; }
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virtual bool GetFirstGroup(wxString& str, long& lIndex);
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virtual bool GetNextGroup (wxString& str, long& lIndex);
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virtual bool GetFirstEntry(wxString& str, long& lIndex);
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virtual bool GetNextEntry (wxString& str, long& lIndex);
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virtual bool Read(wxString *pstr, const char *szKey,
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const char *szDefault = 0) const;
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virtual const char *Read(const char *szKey,
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const char *szDefault = 0) const;
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virtual bool Read(long *pl, const char *szKey, long lDefault) const;
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virtual bool Write(const char *szKey, const char *szValue);
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virtual bool Write(const char *szKey, long lValue);
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virtual bool Flush(bool bCurrentOnly = FALSE);
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virtual bool DeleteEntry(const char *szKey, bool bGroupIfEmptyAlso);
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virtual bool DeleteGroup(const char *szKey);
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virtual bool DeleteAll();
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public:
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// fwd decl
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class ConfigGroup;
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class ConfigEntry;
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// we store all lines of the local config file as a linked list in memory
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class LineList
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{
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public:
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// ctor
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LineList(const wxString& str, LineList *pNext = NULL) : m_strLine(str)
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{ SetNext(pNext); }
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//
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LineList *Next() const { return m_pNext; }
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void SetNext(LineList *pNext) { m_pNext = pNext; }
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//
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void SetText(const wxString& str) { m_strLine = str; }
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const wxString& Text() const { return m_strLine; }
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private:
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wxString m_strLine; // line contents
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LineList *m_pNext; // next node
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};
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// functions to work with this list
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LineList *LineListAppend(const wxString& str);
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LineList *LineListInsert(const wxString& str,
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LineList *pLine); // NULL => Append()
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bool LineListIsEmpty();
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private:
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// put the object in the initial state
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void Init();
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// parse the whole file
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void Parse(wxTextFile& file, bool bLocal);
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// the same as SetPath("/")
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void SetRootPath();
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// member variables
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// ----------------
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LineList *m_linesHead, // head of the linked list
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*m_linesTail; // tail
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wxString m_strLocalFile, // local file name passed to ctor
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m_strGlobalFile; // global
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wxString m_strPath; // current path (not '/' terminated)
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ConfigGroup *m_pRootGroup, // the top (unnamed) group
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*m_pCurrentGroup; // the current group
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//protected: --- if wxFileConfig::ConfigEntry is not public, functions in
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// ConfigGroup such as Find/AddEntry can't return "ConfigEntry *"
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public:
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WX_DEFINE_ARRAY(ConfigEntry *, ArrayEntries);
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WX_DEFINE_ARRAY(ConfigGroup *, ArrayGroups);
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class ConfigEntry
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{
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private:
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ConfigGroup *m_pParent; // group that contains us
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wxString m_strName, // entry name
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m_strValue; // value
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bool m_bDirty, // changed since last read?
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m_bImmutable; // can be overriden locally?
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int m_nLine; // used if m_pLine == NULL only
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LineList *m_pLine; // pointer to our line in the linked list
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// or NULL if it was found in global file
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public:
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ConfigEntry(ConfigGroup *pParent, const wxString& strName, int nLine);
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// simple accessors
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const wxString& Name() const { return m_strName; }
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const wxString& Value() const { return m_strValue; }
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ConfigGroup *Group() const { return m_pParent; }
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bool IsDirty() const { return m_bDirty; }
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bool IsImmutable() const { return m_bImmutable; }
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bool IsLocal() const { return m_pLine != 0; }
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int Line() const { return m_nLine; }
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LineList *GetLine() const { return m_pLine; }
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// modify entry attributes
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void SetValue(const wxString& strValue, bool bUser = TRUE);
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void SetDirty();
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void SetLine(LineList *pLine);
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};
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protected:
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class ConfigGroup
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{
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private:
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wxFileConfig *m_pConfig; // config object we belong to
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ConfigGroup *m_pParent; // parent group (NULL for root group)
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ArrayEntries m_aEntries; // entries in this group
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ArrayGroups m_aSubgroups; // subgroups
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wxString m_strName; // group's name
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bool m_bDirty; // if FALSE => all subgroups are not dirty
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LineList *m_pLine; // pointer to our line in the linked list
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int m_nLastEntry, // last here means "last added"
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m_nLastGroup; //
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public:
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// ctor
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ConfigGroup(ConfigGroup *pParent, const wxString& strName, wxFileConfig *);
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// dtor deletes all entries and subgroups also
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~ConfigGroup();
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// simple accessors
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const wxString& Name() const { return m_strName; }
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ConfigGroup *Parent() const { return m_pParent; }
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wxFileConfig *Config() const { return m_pConfig; }
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bool IsDirty() const { return m_bDirty; }
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bool IsEmpty() const { return Entries().IsEmpty() && Groups().IsEmpty(); }
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const ArrayEntries& Entries() const { return m_aEntries; }
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const ArrayGroups& Groups() const { return m_aSubgroups; }
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// find entry/subgroup (NULL if not found)
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ConfigGroup *FindSubgroup(const char *szName) const;
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ConfigEntry *FindEntry (const char *szName) const;
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// delete entry/subgroup, return FALSE if doesn't exist
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bool DeleteSubgroup(const char *szName);
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bool DeleteEntry(const char *szName);
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// create new entry/subgroup returning pointer to newly created element
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ConfigGroup *AddSubgroup(const wxString& strName);
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ConfigEntry *AddEntry (const wxString& strName, int nLine = NOT_FOUND);
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// will also recursively set parent's dirty flag
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void SetDirty();
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void SetLine(LineList *pLine);
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wxString GetFullName() const;
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// get the last line belonging to an entry/subgroup of this group
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LineList *GetGroupLine();
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LineList *GetLastEntryLine();
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LineList *GetLastGroupLine();
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};
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};
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#endif //_FILECONF_H
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