apt-pkg/contrib/configuration.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: configuration.h,v 1.16 2002/11/11 06:55:50 doogie 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    A special extension, support for ordered lists is provided by using the
  22    special syntax, "block::list::" the trailing :: designates the
  23    item as a list. To access the list you must use the tree function on
  24    "block::list".
  25
  26    ##################################################################### */
  27                                                                         /*}}}*/
  28 #ifndef PKGLIB_CONFIGURATION_H
  29 #define PKGLIB_CONFIGURATION_H
  30
  31 #include <regex.h>
  32
  33 #include <string>
  34 #include <vector>
  35 #include <iostream>
  36
  37 class Configuration
  38 {
  39    public:
  40
  41    struct Item
  42    {
  43       std::string Value;
  44       std::string Tag;
  45       Item *Parent;
  46       Item *Child;
  47       Item *Next;
  48
  49       std::string FullTag(const Item *Stop = 0) const;
  50
  51       Item() : Parent(0), Child(0), Next(0) {};
  52    };
  53
  54    private:
  55
  56    Item *Root;
  57    bool ToFree;
  58
  59    Item *Lookup(Item *Head,const char *S,unsigned long const &Len,bool const &Create);
  60    Item *Lookup(const char *Name,const bool &Create);
  61    inline const Item *Lookup(const char *Name) const
  62    {
  63       return ((Configuration *)this)->Lookup(Name,false);
  64    }
  65
  66    public:
  67
  68    std::string Find(const char *Name,const char *Default = 0) const;
  69    std::string Find(std::string const &Name,const char *Default = 0) const {return Find(Name.c_str(),Default);};
  70    std::string Find(std::string const &Name, std::string const &Default) const {return Find(Name.c_str(),Default.c_str());};
  71    std::string FindFile(const char *Name,const char *Default = 0) const;
  72    std::string FindDir(const char *Name,const char *Default = 0) const;
  73    std::vector<std::string> FindVector(const char *Name) const;
  74    std::vector<std::string> FindVector(std::string const &Name) const { return FindVector(Name.c_str()); };
  75    int FindI(const char *Name,int const &Default = 0) const;
  76    int FindI(std::string const &Name,int const &Default = 0) const {return FindI(Name.c_str(),Default);};
  77    bool FindB(const char *Name,bool const &Default = false) const;
  78    bool FindB(std::string const &Name,bool const &Default = false) const {return FindB(Name.c_str(),Default);};
  79    std::string FindAny(const char *Name,const char *Default = 0) const;
  80
  81    inline void Set(const std::string &Name,const std::string &Value) {Set(Name.c_str(),Value);};
  82    void CndSet(const char *Name,const std::string &Value);
  83    void CndSet(const char *Name,const int Value);
  84    void Set(const char *Name,const std::string &Value);
  85    void Set(const char *Name,const int &Value);
  86
  87    inline bool Exists(const std::string &Name) const {return Exists(Name.c_str());};
  88    bool Exists(const char *Name) const;
  89    bool ExistsAny(const char *Name) const;
  90
  91    // clear a whole tree
  92    void Clear(const std::string &Name);
  93
  94    // remove a certain value from a list (e.g. the list of "APT::Keep-Fds")
  95    void Clear(std::string const &List, std::string const &Value);
  96    void Clear(std::string const &List, int const &Value);
  97
  98    inline const Item *Tree(const char *Name) const {return Lookup(Name);};
  99
 100    inline void Dump() { Dump(std::clog); };
 101    void Dump(std::ostream& str);
 102
 103    Configuration(const Item *Root);
 104    Configuration();
 105    ~Configuration();
 106
 107    /** \brief match a string against a configurable list of patterns */
 108    class MatchAgainstConfig
 109    {
 110      std::vector<regex_t *> patterns;
 111      void clearPatterns();
 112
 113    public:
 114      MatchAgainstConfig(char const * Config);
 115      virtual ~MatchAgainstConfig();
 116
 117      /** \brief Returns \b true for a string matching one of the patterns */
 118      bool Match(char const * str) const;
 119      bool Match(std::string const &str) const { return Match(str.c_str()); };
 120
 121      /** \brief returns if the matcher setup was successful */
 122      bool wasConstructedSuccessfully() const { return patterns.empty() == false; }
 123    };
 124 };
 125
 126 extern Configuration *_config;
 127
 128 bool ReadConfigFile(Configuration &Conf,const std::string &FName,
 129                     bool const &AsSectional = false,
 130                     unsigned const &Depth = 0);
 131
 132 bool ReadConfigDir(Configuration &Conf,const std::string &Dir,
 133                    bool const &AsSectional = false,
 134                    unsigned const &Depth = 0);
 135
 136 #endif