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 #include <apt-pkg/macros.h>
  38
  39 #ifndef APT_8_CLEANER_HEADERS
  40 using std::string;
  41 #endif
  42
  43 class Configuration
  44 {
  45    public:
  46
  47    struct Item
  48    {
  49       std::string Value;
  50       std::string Tag;
  51       Item *Parent;
  52       Item *Child;
  53       Item *Next;
  54
  55       std::string FullTag(const Item *Stop = 0) const;
  56
  57       Item() : Parent(0), Child(0), Next(0) {};
  58    };
  59
  60    private:
  61
  62    Item *Root;
  63    bool ToFree;
  64
  65    Item *Lookup(Item *Head,const char *S,unsigned long const &Len,bool const &Create);
  66    Item *Lookup(const char *Name,const bool &Create);
  67    inline const Item *Lookup(const char *Name) const
  68    {
  69       return ((Configuration *)this)->Lookup(Name,false);
  70    }
  71
  72    public:
  73
  74    std::string Find(const char *Name,const char *Default = 0) const;
  75    std::string Find(std::string const &Name,const char *Default = 0) const {return Find(Name.c_str(),Default);};
  76    std::string Find(std::string const &Name, std::string const &Default) const {return Find(Name.c_str(),Default.c_str());};
  77    std::string FindFile(const char *Name,const char *Default = 0) const;
  78    std::string FindDir(const char *Name,const char *Default = 0) const;
  79    /** return a list of child options
  80     *
  81     * Options like Acquire::Languages are handled as lists which
  82     * can be overridden and have a default. For the later two a comma
  83     * separated list of values is supported.
  84     *
  85     * \param Name of the parent node
  86     * \param Default list of values separated by commas */
  87    std::vector<std::string> FindVector(const char *Name, std::string const &Default = "") const;
  88    std::vector<std::string> FindVector(std::string const &Name, std::string const &Default = "") const { return FindVector(Name.c_str(), Default); };
  89    int FindI(const char *Name,int const &Default = 0) const;
  90    int FindI(std::string const &Name,int const &Default = 0) const {return FindI(Name.c_str(),Default);};
  91    bool FindB(const char *Name,bool const &Default = false) const;
  92    bool FindB(std::string const &Name,bool const &Default = false) const {return FindB(Name.c_str(),Default);};
  93    std::string FindAny(const char *Name,const char *Default = 0) const;
  94
  95    inline void Set(const std::string &Name,const std::string &Value) {Set(Name.c_str(),Value);};
  96    void CndSet(const char *Name,const std::string &Value);
  97    void CndSet(const char *Name,const int Value);
  98    void Set(const char *Name,const std::string &Value);
  99    void Set(const char *Name,const int &Value);
 100
 101    inline bool Exists(const std::string &Name) const {return Exists(Name.c_str());};
 102    bool Exists(const char *Name) const;
 103    bool ExistsAny(const char *Name) const;
 104
 105    // clear a whole tree
 106    void Clear(const std::string &Name);
 107    void Clear();
 108
 109    // remove a certain value from a list (e.g. the list of "APT::Keep-Fds")
 110    void Clear(std::string const &List, std::string const &Value);
 111    void Clear(std::string const &List, int const &Value);
 112
 113    inline const Item *Tree(const char *Name) const {return Lookup(Name);};
 114
 115    inline void Dump() { Dump(std::clog); };
 116    void Dump(std::ostream& str);
 117    void Dump(std::ostream& str, char const * const root,
 118              char const * const format, bool const emptyValue);
 119
 120    Configuration(const Item *Root);
 121    Configuration();
 122    ~Configuration();
 123
 124    /** \brief match a string against a configurable list of patterns */
 125    class MatchAgainstConfig
 126    {
 127      std::vector<regex_t *> patterns;
 128      APT_HIDDEN void clearPatterns();
 129
 130    public:
 131      MatchAgainstConfig(char const * Config);
 132      virtual ~MatchAgainstConfig();
 133
 134      /** \brief Returns \b true for a string matching one of the patterns */
 135      bool Match(char const * str) const;
 136      bool Match(std::string const &str) const { return Match(str.c_str()); };
 137
 138      /** \brief returns if the matcher setup was successful */
 139      bool wasConstructedSuccessfully() const { return patterns.empty() == false; }
 140    };
 141 };
 142
 143 extern Configuration *_config;
 144
 145 bool ReadConfigFile(Configuration &Conf,const std::string &FName,
 146                     bool const &AsSectional = false,
 147                     unsigned const &Depth = 0);
 148
 149 bool ReadConfigDir(Configuration &Conf,const std::string &Dir,
 150                    bool const &AsSectional = false,
 151                    unsigned const &Depth = 0);
 152
 153 #endif