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libconfig.h++

/* ----------------------------------------------------------------------------
   libconfig - A library for processing structured configuration files
   Copyright (C) 2005-2008  Mark A Lindner
 
   This file is part of libconfig.
    
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License
   as published by the Free Software Foundation; either version 2.1 of
   the License, or (at your option) any later version.
    
   This library is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
    
   You should have received a copy of the GNU Library General Public
   License along with this library; if not, see
   <http://www.gnu.org/licenses/>.
   ----------------------------------------------------------------------------
*/

#ifndef __libconfig_hpp
#define __libconfig_hpp

#include <stdio.h>
#include <string>
#include <map>

namespace libconfig
{

#include <libconfig.h>

  class LIBCONFIG_API ConfigException : public std::exception { };

  class Setting; // fwd decl

  class LIBCONFIG_API SettingException : public ConfigException
  {
    friend class Config;

    public:

    SettingException(const SettingException &other);
    SettingException& operator=(const SettingException &other);
    
    virtual ~SettingException() throw();

    const char *getPath() const;

    virtual const char *what() const throw();
    
    protected:

    SettingException(const Setting &setting);
    SettingException(const Setting &setting, int idx);
    SettingException(const Setting &setting, const char *name);
    SettingException(const char *path);

    private:

    char *_path;
  };
  
  class LIBCONFIG_API SettingTypeException : public SettingException
  {
    friend class Config;
    friend class Setting;

    const char *what() const throw();
    
    private:

    SettingTypeException(const Setting &setting);
    SettingTypeException(const Setting &setting, int idx);
    SettingTypeException(const Setting &setting, const char *name);
  };

  class LIBCONFIG_API SettingNotFoundException : public SettingException
  {
    friend class Config;
    friend class Setting;

    const char *what() const throw();
    
    private:

    SettingNotFoundException(const Setting &setting, int idx);
    SettingNotFoundException(const Setting &setting, const char *name);
    SettingNotFoundException(const char *path);
  };

  class LIBCONFIG_API SettingNameException : public SettingException
  {
    friend class Config;
    friend class Setting;

    const char *what() const throw();
    
    private:

    SettingNameException(const Setting &setting, const char *name);
  };

  class LIBCONFIG_API FileIOException : public ConfigException
  {
    const char *what() const throw();
  };

  class LIBCONFIG_API ParseException : public ConfigException
  {
    friend class Config;
    
    public:

    virtual ~ParseException() throw();

    inline int getLine() throw()
    { return(_line); }

    inline const char *getError() throw()
    { return(_error); }

    const char *what() const throw();
    
    private:

    ParseException(int line, const char *error);

    int _line;
    const char *_error;
  };

  class LIBCONFIG_API Setting
  {
    friend class Config;

    public:
    
    enum Type
    {
      TypeNone = 0,
      // scalar types
      TypeInt,
      TypeInt64,
      TypeFloat,
      TypeString,
      TypeBoolean,
      // aggregate types
      TypeGroup,
      TypeArray,
      TypeList
    };

    enum Format
    {
      FormatDefault = 0,
      FormatHex = 1
    };
    
    private:

    config_setting_t *_setting;
    Type _type;
    Format _format;

    Setting(config_setting_t *setting);

    void assertType(Type type) const
      throw(SettingTypeException);
    static Setting & wrapSetting(config_setting_t *setting);

    Setting(const Setting& other); // not supported
    Setting& operator=(const Setting& other); // not supported
    
    public:

    virtual ~Setting() throw();
  
    inline Type getType() const throw() { return(_type); }

    inline Format getFormat() const throw() { return(_format); }
    void setFormat(Format format) throw();

    operator bool() const throw(SettingTypeException);
    operator long() const throw(SettingTypeException);
    operator unsigned long() const throw(SettingTypeException);
    operator int() const throw(SettingTypeException);
    operator unsigned int() const throw(SettingTypeException);
    operator long long() const throw(SettingTypeException);
    operator unsigned long long() const throw(SettingTypeException);
    operator double() const throw(SettingTypeException);
    operator float() const throw(SettingTypeException);
    operator const char *() const throw(SettingTypeException);
    operator std::string() const throw(SettingTypeException);

    Setting & operator=(bool value) throw(SettingTypeException);
    Setting & operator=(long value) throw(SettingTypeException);
    Setting & operator=(int value) throw(SettingTypeException);
    Setting & operator=(const long long &value) throw(SettingTypeException);
    Setting & operator=(const double &value) throw(SettingTypeException);
    Setting & operator=(float value) throw(SettingTypeException);
    Setting & operator=(const char *value) throw(SettingTypeException);
    Setting & operator=(const std::string &value) throw(SettingTypeException);

    Setting & operator[](const char * key) const
      throw(SettingTypeException, SettingNotFoundException);

    inline Setting & operator[](const std::string & key) const
      throw(SettingTypeException, SettingNotFoundException)
    { return(operator[](key.c_str())); }

    Setting & operator[](int index) const
      throw(SettingTypeException, SettingNotFoundException);

    bool lookupValue(const char *name, bool &value) const throw();
    bool lookupValue(const char *name, long &value) const throw();
    bool lookupValue(const char *name, unsigned long &value) const throw();
    bool lookupValue(const char *name, int &value) const throw();
    bool lookupValue(const char *name, unsigned int &value) const throw();
    bool lookupValue(const char *name, long long &value) const throw();
    bool lookupValue(const char *name, unsigned long long &value)
      const throw();
    bool lookupValue(const char *name, double &value) const throw();
    bool lookupValue(const char *name, float &value) const throw();
    bool lookupValue(const char *name, const char *&value) const throw();
    bool lookupValue(const char *name, std::string &value) const throw();

    inline bool lookupValue(const std::string &name, bool &value)
      const throw()
    { return(lookupValue(name.c_str(), value)); }
      
    inline bool lookupValue(const std::string &name, long &value)
      const throw()
    { return(lookupValue(name.c_str(), value)); }

    inline bool lookupValue(const std::string &name, unsigned long &value)
      const throw()
    { return(lookupValue(name.c_str(), value)); }

    inline bool lookupValue(const std::string &name, int &value) const throw()
    { return(lookupValue(name.c_str(), value)); }

    inline bool lookupValue(const std::string &name, unsigned int &value)
      const throw()
    { return(lookupValue(name.c_str(), value)); }

    inline bool lookupValue(const std::string &name, long long &value)
      const throw()
    { return(lookupValue(name.c_str(), value)); }
    
    inline bool lookupValue(const std::string &name,
                            unsigned long long &value) const throw()
    { return(lookupValue(name.c_str(), value)); }
    
    inline bool lookupValue(const std::string &name, double &value) const
      throw()
    { return(lookupValue(name.c_str(), value)); }

    inline bool lookupValue(const std::string &name, float &value) const
      throw()
    { return(lookupValue(name.c_str(), value)); }

    inline bool lookupValue(const std::string &name, const char *&value) const
      throw()
    { return(lookupValue(name.c_str(), value)); }

    inline bool lookupValue(const std::string &name, std::string &value) const
      throw()
    { return(lookupValue(name.c_str(), value)); }
    
    void remove(const char *name)
      throw(SettingTypeException, SettingNotFoundException);

    inline void remove(const std::string & name)
      throw(SettingTypeException, SettingNotFoundException)
    { remove(name.c_str()); }

    void remove(unsigned int idx)
      throw(SettingTypeException, SettingNotFoundException);
    
    inline Setting & add(const std::string & name, Type type)
      throw(SettingNameException, SettingTypeException)
    { return(add(name.c_str(), type)); }
  
    Setting & add(const char *name, Type type)
      throw(SettingNameException, SettingTypeException);
    
    Setting & add(Type type)
      throw(SettingTypeException);

    inline bool exists(const std::string & name) const throw()
    { return(exists(name.c_str())); }

    bool exists(const char *name) const throw();
  
    int getLength() const throw();
    const char *getName() const throw();
    std::string getPath() const;
    int getIndex() const throw();

    const Setting & getParent() const throw(SettingNotFoundException);
    Setting & getParent() throw(SettingNotFoundException);

    bool isRoot() const throw();
    
    inline bool isGroup() const throw()
    { return(_type == TypeGroup); }

    inline bool isArray() const throw()
    { return(_type == TypeArray); }

    inline bool isList() const throw()
    { return(_type == TypeList); }

    inline bool isAggregate() const throw()
    { return(_type >= TypeGroup); }

    inline bool isScalar() const throw()
    { return((_type > TypeNone) && (_type < TypeGroup)); }

    inline bool isNumber() const throw()
    { return((_type == TypeInt) || (_type == TypeInt64)
             || (_type == TypeFloat)); }

    inline unsigned int getSourceLine() const throw()
    { return(config_setting_source_line(_setting)); }
  };

  class LIBCONFIG_API Config
  {
    private:
    
    config_t _config;
    
    static void ConfigDestructor(void *arg);
    Config(const Config& other); // not supported
    Config& operator=(const Config& other); // not supported

    public:

    Config();
    virtual ~Config();

    void setAutoConvert(bool flag);
    bool getAutoConvert() const;
    
    void read(FILE *stream) throw(ParseException);
    void write(FILE *stream) const;

    void readFile(const char *filename) throw(FileIOException, ParseException);
    void writeFile(const char *filename) throw(FileIOException);

    inline Setting & lookup(const std::string &path) const
      throw(SettingNotFoundException)
    { return(lookup(path.c_str())); }
    
    Setting & lookup(const char *path) const
      throw(SettingNotFoundException);

    inline bool exists(const std::string & path) const throw()
    { return(exists(path.c_str())); }

    bool exists(const char *path) const throw();
    
    bool lookupValue(const char *path, bool &value) const throw();
    bool lookupValue(const char *path, long &value) const throw();
    bool lookupValue(const char *path, unsigned long &value) const throw();
    bool lookupValue(const char *path, int &value) const throw();
    bool lookupValue(const char *path, unsigned int &value) const throw();
    bool lookupValue(const char *path, long long &value) const throw();
    bool lookupValue(const char *path, unsigned long long &value)
      const throw();
    bool lookupValue(const char *path, double &value) const throw();
    bool lookupValue(const char *path, float &value) const throw();
    bool lookupValue(const char *path, const char *&value) const throw();
    bool lookupValue(const char *path, std::string &value) const throw();

    inline bool lookupValue(const std::string &path, bool &value)
      const throw()
    { return(lookupValue(path.c_str(), value)); }
      
    inline bool lookupValue(const std::string &path, long &value)
      const throw()
    { return(lookupValue(path.c_str(), value)); }

    inline bool lookupValue(const std::string &path, unsigned long &value)
      const throw()
    { return(lookupValue(path.c_str(), value)); }

    inline bool lookupValue(const std::string &path, int &value) const throw()
    { return(lookupValue(path.c_str(), value)); }

    inline bool lookupValue(const std::string &path, unsigned int &value)
      const throw()
    { return(lookupValue(path.c_str(), value)); }

    inline bool lookupValue(const std::string &path, long long &value)
      const throw()
    { return(lookupValue(path.c_str(), value)); }

    inline bool lookupValue(const std::string &path,
                            unsigned long long &value) const throw()
    { return(lookupValue(path.c_str(), value)); }
    
    inline bool lookupValue(const std::string &path, double &value) const
      throw()
    { return(lookupValue(path.c_str(), value)); }

    inline bool lookupValue(const std::string &path, float &value) const
      throw()
    { return(lookupValue(path.c_str(), value)); }

    inline bool lookupValue(const std::string &path, const char *&value) const
      throw()
    { return(lookupValue(path.c_str(), value)); }

    inline bool lookupValue(const std::string &path, std::string &value) const
      throw()
    { return(lookupValue(path.c_str(), value)); }
    
    Setting & getRoot() const;    
  };

} // namespace libconfig

#endif // __libconfig_hpp

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