/* -*- mode: C++; indent-tabs-mode: nil; -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library.

  *

  * Copyright (C) 2003-2010

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided "AS IS" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 #ifndef LEMON_ARG_PARSER_H

 #define LEMON_ARG_PARSER_H

 #include <vector>

 #include <map>

 #include <list>

 #include <string>

 #include <iostream>

 #include <sstream>

 #include <algorithm>

 #include <lemon/assert.h>

 ///\ingroup misc

 ///\file

 ///\brief A tool to parse command line arguments.

 namespace lemon {

   ///Exception used by ArgParser

   class ArgParserException : public Exception {

   public:

     enum Reason {

       HELP,         /// <tt>--help</tt> option was given

       UNKNOWN_OPT,  /// Unknown option was given

       INVALID_OPT   /// Invalid combination of options

     };

   private:

     Reason _reason;

   public:

     ///Constructor

     ArgParserException(Reason r) throw() : _reason(r) {}

     ///Virtual destructor

     virtual ~ArgParserException() throw() {}

     ///A short description of the exception

     virtual const char* what() const throw() {

       switch(_reason)

         {

         case HELP:

           return "lemon::ArgParseException: ask for help";

           break;

         case UNKNOWN_OPT:

           return "lemon::ArgParseException: unknown option";

           break;

         case INVALID_OPT:

           return "lemon::ArgParseException: invalid combination of options";

           break;

         }

       return "";

     }

     ///Return the reason for the failure

     Reason reason() const {return _reason; }

   };

   ///Command line arguments parser

   ///\ingroup misc

   ///Command line arguments parser.

   ///

   ///For a complete example see the \ref arg_parser_demo.cc demo file.

   class ArgParser {

     static void _showHelp(void *p);

   protected:

     int _argc;

     const char * const *_argv;

     enum OptType { UNKNOWN=0, BOOL=1, STRING=2, DOUBLE=3, INTEGER=4, FUNC=5 };

     class ParData {

     public:

       union {

         bool *bool_p;

         int *int_p;

         double *double_p;

         std::string *string_p;

         struct {

           void (*p)(void *);

           void *data;

         } func_p;

       };

       std::string help;

       bool mandatory;

       OptType type;

       bool set;

       bool ingroup;

       bool has_syn;

       bool syn;

       bool self_delete;

       ParData() : mandatory(false), type(UNKNOWN), set(false), ingroup(false),

                   has_syn(false), syn(false), self_delete(false) {}

     };

     typedef std::map<std::string,ParData> Opts;

     Opts _opts;

     class GroupData

     {

     public:

       typedef std::list<std::string> Opts;

       Opts opts;

       bool only_one;

       bool mandatory;

       GroupData() :only_one(false), mandatory(false) {}

     };

     typedef std::map<std::string,GroupData> Groups;

     Groups _groups;

     struct OtherArg

     {

       std::string name;

       std::string help;

       OtherArg(std::string n, std::string h) :name(n), help(h) {}

     };

     std::vector<OtherArg> _others_help;

     std::vector<std::string> _file_args;

     std::string _command_name;

   private:

     //Bind a function to an option.

     //\param name The name of the option. The leading '-' must be omitted.

     //\param help A help string.

     //\retval func The function to be called when the option is given. It

     //  must be of type "void f(void *)"

     //\param data Data to be passed to \c func

     ArgParser &funcOption(const std::string &name,

                     const std::string &help,

                     void (*func)(void *),void *data);

     bool _exit_on_problems;

     void _terminate(ArgParserException::Reason reason) const;

   public:

     ///Constructor

     ArgParser(int argc, const char * const *argv);

     ~ArgParser();

     ///\name Options

     ///

     ///@{

     ///Add a new integer type option

     ///Add a new integer type option.

     ///\param name The name of the option. The leading '-' must be omitted.

     ///\param help A help string.

     ///\param value A default value for the option.

     ///\param obl Indicate if the option is mandatory.

     ArgParser &intOption(const std::string &name,

                     const std::string &help,

                     int value=0, bool obl=false);

     ///Add a new floating point type option

     ///Add a new floating point type option.

     ///\param name The name of the option. The leading '-' must be omitted.

     ///\param help A help string.

     ///\param value A default value for the option.

     ///\param obl Indicate if the option is mandatory.

     ArgParser &doubleOption(const std::string &name,

                       const std::string &help,

                       double value=0, bool obl=false);

     ///Add a new bool type option

     ///Add a new bool type option.

     ///\param name The name of the option. The leading '-' must be omitted.

     ///\param help A help string.

     ///\param value A default value for the option.

     ///\param obl Indicate if the option is mandatory.

     ///\note A mandatory bool obtion is of very little use.

     ArgParser &boolOption(const std::string &name,

                       const std::string &help,

                       bool value=false, bool obl=false);

     ///Add a new string type option

     ///Add a new string type option.

     ///\param name The name of the option. The leading '-' must be omitted.

     ///\param help A help string.

     ///\param value A default value for the option.

     ///\param obl Indicate if the option is mandatory.

     ArgParser &stringOption(const std::string &name,

                       const std::string &help,

                       std::string value="", bool obl=false);

     ///Give help string for non-parsed arguments.

     ///With this function you can give help string for non-parsed arguments.

     ///The parameter \c name will be printed in the short usage line, while

     ///\c help gives a more detailed description.

     ArgParser &other(const std::string &name,

                      const std::string &help="");

     ///@}

     ///\name Options with External Storage

     ///Using this functions, the value of the option will be directly written

     ///into a variable once the option appears in the command line.

     ///@{

     ///Add a new integer type option with a storage reference

     ///Add a new integer type option with a storage reference.

     ///\param name The name of the option. The leading '-' must be omitted.

     ///\param help A help string.

     ///\param obl Indicate if the option is mandatory.

     ///\retval ref The value of the argument will be written to this variable.

     ArgParser &refOption(const std::string &name,

                     const std::string &help,

                     int &ref, bool obl=false);

     ///Add a new floating type option with a storage reference

     ///Add a new floating type option with a storage reference.

     ///\param name The name of the option. The leading '-' must be omitted.

     ///\param help A help string.

     ///\param obl Indicate if the option is mandatory.

     ///\retval ref The value of the argument will be written to this variable.

     ArgParser &refOption(const std::string &name,

                       const std::string &help,

                       double &ref, bool obl=false);

     ///Add a new bool type option with a storage reference

     ///Add a new bool type option with a storage reference.

     ///\param name The name of the option. The leading '-' must be omitted.

     ///\param help A help string.

     ///\param obl Indicate if the option is mandatory.

     ///\retval ref The value of the argument will be written to this variable.

     ///\note A mandatory bool obtion is of very little use.

     ArgParser &refOption(const std::string &name,

                       const std::string &help,

                       bool &ref, bool obl=false);

     ///Add a new string type option with a storage reference

     ///Add a new string type option with a storage reference.

     ///\param name The name of the option. The leading '-' must be omitted.

     ///\param help A help string.

     ///\param obl Indicate if the option is mandatory.

     ///\retval ref The value of the argument will be written to this variable.

     ArgParser &refOption(const std::string &name,

                       const std::string &help,

                       std::string &ref, bool obl=false);

     ///@}

     ///\name Option Groups and Synonyms

     ///

     ///@{

     ///Bundle some options into a group

     /// You can group some option by calling this function repeatedly for each

     /// option to be grouped with the same groupname.

     ///\param group The group name.

     ///\param opt The option name.

     ArgParser &optionGroup(const std::string &group,

                            const std::string &opt);

     ///Make the members of a group exclusive

     ///If you call this function for a group, than at most one of them can be

     ///given at the same time.

     ArgParser &onlyOneGroup(const std::string &group);

     ///Make a group mandatory

     ///Using this function, at least one of the members of \c group

     ///must be given.

     ArgParser &mandatoryGroup(const std::string &group);

     ///Create synonym to an option

     ///With this function you can create a synonym \c syn of the

     ///option \c opt.

     ArgParser &synonym(const std::string &syn,

                            const std::string &opt);

     ///@}

   private:

     void show(std::ostream &os,Opts::const_iterator i) const;

     void show(std::ostream &os,Groups::const_iterator i) const;

     void showHelp(Opts::const_iterator i) const;

     void showHelp(std::vector<OtherArg>::const_iterator i) const;

     void unknownOpt(std::string arg) const;

     void requiresValue(std::string arg, OptType t) const;

     void checkMandatories() const;

     void shortHelp() const;

     void showHelp() const;

   public:

     ///Start the parsing process

     ArgParser &parse();

     /// Synonym for parse()

     ArgParser &run()

     {

       return parse();

     }

     ///Give back the command name (the 0th argument)

     const std::string &commandName() const { return _command_name; }

     ///Check if an opion has been given to the command.

     bool given(std::string op) const

     {

       Opts::const_iterator i = _opts.find(op);

       return i!=_opts.end()?i->second.set:false;

     }

     ///Magic type for operator[]

     ///This is the type of the return value of ArgParser::operator[]().

     ///It automatically converts to \c int, \c double, \c bool or

     ///\c std::string if the type of the option matches, which is checked

     ///with an \ref LEMON_ASSERT "assertion" (i.e. it performs runtime

     ///type checking).

     class RefType

     {

       const ArgParser &_parser;

       std::string _name;

     public:

       ///\e

       RefType(const ArgParser &p,const std::string &n) :_parser(p),_name(n) {}

       ///\e

       operator bool()

       {

         Opts::const_iterator i = _parser._opts.find(_name);

         LEMON_ASSERT(i!=_parser._opts.end(),

                      std::string()+"Unkown option: '"+_name+"'");

         LEMON_ASSERT(i->second.type==ArgParser::BOOL,

                      std::string()+"'"+_name+"' is a bool option");

         return *(i->second.bool_p);

       }

       ///\e

       operator std::string()

       {

         Opts::const_iterator i = _parser._opts.find(_name);

         LEMON_ASSERT(i!=_parser._opts.end(),

                      std::string()+"Unkown option: '"+_name+"'");

         LEMON_ASSERT(i->second.type==ArgParser::STRING,

                      std::string()+"'"+_name+"' is a string option");

         return *(i->second.string_p);

       }

       ///\e

       operator double()

       {

         Opts::const_iterator i = _parser._opts.find(_name);

         LEMON_ASSERT(i!=_parser._opts.end(),

                      std::string()+"Unkown option: '"+_name+"'");

         LEMON_ASSERT(i->second.type==ArgParser::DOUBLE ||

                      i->second.type==ArgParser::INTEGER,

                      std::string()+"'"+_name+"' is a floating point option");

         return i->second.type==ArgParser::DOUBLE ?

           *(i->second.double_p) : *(i->second.int_p);

       }

       ///\e

       operator int()

       {

         Opts::const_iterator i = _parser._opts.find(_name);

         LEMON_ASSERT(i!=_parser._opts.end(),

                      std::string()+"Unkown option: '"+_name+"'");

         LEMON_ASSERT(i->second.type==ArgParser::INTEGER,

                      std::string()+"'"+_name+"' is an integer option");

         return *(i->second.int_p);

       }

     };

     ///Give back the value of an option

     ///Give back the value of an option.

     ///\sa RefType

     RefType operator[](const std::string &n) const

     {

       return RefType(*this, n);

     }

     ///Give back the non-option type arguments.

     ///Give back a reference to a vector consisting of the program arguments

     ///not starting with a '-' character.

     const std::vector<std::string> &files() const { return _file_args; }

     ///Throw instead of exit in case of problems

     void throwOnProblems()

     {

       _exit_on_problems=false;

     }

   };

 }

 #endif // LEMON_ARG_PARSER_H