apt-pkg/contrib/configuration.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: configuration.h,v 1.8 1998/11/04 07:11:12 jgg Exp $
   4 /* ######################################################################
   5
   6    Configuration Class
   7
   8    This class provides a configuration file and command line parser
   9    for a tree-oriented configuration environment. All runtime configuration
  10    is stored in here.
  11
  12    Each configuration name is given as a fully scoped string such as
  13      Foo::Bar
  14    And has associated with it a text string. The Configuration class only
  15    provides storage and lookup for this tree, other classes provide
  16    configuration file formats (and parsers/emitters if needed).
  17
  18    Most things can get by quite happily with,
  19      cout << _config->Find("Foo::Bar") << endl;
  20
  21    ##################################################################### */
  22                                                                         /*}}}*/
  23 // Header section: pkglib
  24 #ifndef PKGLIB_CONFIGURATION_H
  25 #define PKGLIB_CONFIGURATION_H
  26
  27 #ifdef __GNUG__
  28 #pragma interface "apt-pkg/configuration.h"
  29 #endif
  30
  31 #include <string>
  32
  33 class Configuration
  34 {
  35    struct Item
  36    {
  37       string Value;
  38       string Tag;
  39       Item *Parent;
  40       Item *Child;
  41       Item *Next;
  42
  43       string FullTag() const;
  44
  45       Item() : Child(0), Next(0) {};
  46    };
  47    Item *Root;
  48
  49    Item *Lookup(Item *Head,const char *S,unsigned long Len,bool Create);
  50    Item *Lookup(const char *Name,bool Create);
  51
  52    public:
  53
  54    string Find(const char *Name,const char *Default = 0);
  55    string Find(string Name,const char *Default = 0) {return Find(Name.c_str(),Default);};
  56    string FindFile(const char *Name,const char *Default = 0);
  57    string FindDir(const char *Name,const char *Default = 0);
  58    int FindI(const char *Name,int Default = 0);
  59    bool FindB(const char *Name,bool Default = false);
  60
  61    inline void Set(string Name,string Value) {Set(Name.c_str(),Value);};
  62    void Set(const char *Name,string Value);
  63    void Set(const char *Name,int Value);
  64
  65    inline bool Exists(string Name) {return Exists(Name.c_str());};
  66    bool Exists(const char *Name);
  67
  68    inline const Item *Tree(const char *Name) {return Lookup(Name,false);};
  69
  70    void Dump();
  71
  72    Configuration();
  73 };
  74
  75 extern Configuration *_config;
  76
  77 bool ReadConfigFile(Configuration &Conf,string File);
  78
  79 #endif