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 using std::string;
  38
  39 class Configuration
  40 {
  41    public:
  42
  43    struct Item
  44    {
  45       string Value;
  46       string Tag;
  47       Item *Parent;
  48       Item *Child;
  49       Item *Next;
  50
  51       string FullTag(const Item *Stop = 0) const;
  52
  53       Item() : Parent(0), Child(0), Next(0) {};
  54    };
  55
  56    private:
  57
  58    Item *Root;
  59    bool ToFree;
  60
  61    Item *Lookup(Item *Head,const char *S,unsigned long const &Len,bool const &Create);
  62    Item *Lookup(const char *Name,const bool &Create);
  63    inline const Item *Lookup(const char *Name) const
  64    {
  65       return ((Configuration *)this)->Lookup(Name,false);
  66    }
  67
  68    public:
  69
  70    string Find(const char *Name,const char *Default = 0) const;
  71    string Find(string const &Name,const char *Default = 0) const {return Find(Name.c_str(),Default);};
  72    string Find(string const &Name, string const &Default) const {return Find(Name.c_str(),Default.c_str());};
  73    string FindFile(const char *Name,const char *Default = 0) const;
  74    string FindDir(const char *Name,const char *Default = 0) const;
  75    std::vector<string> FindVector(string const &Name) const;
  76    std::vector<string> FindVector(const char *Name) const;
  77    int FindI(const char *Name,int const &Default = 0) const;
  78    int FindI(string const &Name,int const &Default = 0) const {return FindI(Name.c_str(),Default);};
  79    bool FindB(const char *Name,bool const &Default = false) const;
  80    bool FindB(string const &Name,bool const &Default = false) const {return FindB(Name.c_str(),Default);};
  81    string FindAny(const char *Name,const char *Default = 0) const;
  82
  83    inline void Set(const string &Name,const string &Value) {Set(Name.c_str(),Value);};
  84    void CndSet(const char *Name,const string &Value);
  85    void Set(const char *Name,const string &Value);
  86    void Set(const char *Name,const int &Value);
  87
  88    inline bool Exists(const string &Name) const {return Exists(Name.c_str());};
  89    bool Exists(const char *Name) const;
  90    bool ExistsAny(const char *Name) const;
  91
  92    // clear a whole tree
  93    void Clear(const string &Name);
  94
  95    // remove a certain value from a list (e.g. the list of "APT::Keep-Fds")
  96    void Clear(string const &List, string const &Value);
  97    void Clear(string const &List, int const &Value);
  98
  99    inline const Item *Tree(const char *Name) const {return Lookup(Name);};
 100
 101    inline void Dump() { Dump(std::clog); };
 102    void Dump(std::ostream& str);
 103
 104    Configuration(const Item *Root);
 105    Configuration();
 106    ~Configuration();
 107
 108    /** \brief match a string against a configurable list of patterns */
 109    class MatchAgainstConfig
 110    {
 111      std::vector<regex_t *> patterns;
 112      void clearPatterns();
 113
 114    public:
 115      MatchAgainstConfig(char const * Config);
 116      virtual ~MatchAgainstConfig();
 117
 118      /** \brief Returns \b true for a string matching one of the patterns */
 119      bool Match(char const * str) const;
 120      bool Match(std::string const &str) const { return Match(str.c_str()); };
 121
 122      /** \brief returns if the matcher setup was successful */
 123      bool wasConstructedSuccessfully() const { return patterns.empty() == false; }
 124    };
 125 };
 126
 127 extern Configuration *_config;
 128
 129 bool ReadConfigFile(Configuration &Conf,const string &FName,
 130                     bool const &AsSectional = false,
 131                     unsigned const &Depth = 0);
 132
 133 bool ReadConfigDir(Configuration &Conf,const string &Dir,
 134                    bool const &AsSectional = false,
 135                    unsigned const &Depth = 0);
 136
 137 #endif