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    1 /*  Arg_parser - A POSIX/GNU command line argument parser.
    2     Copyright (C) 2006, 2007, 2008 Antonio Diaz Diaz.
    3 
    4     This program is free software: you can redistribute it and/or modify
    5     it under the terms of the GNU General Public License as published by
    6     the Free Software Foundation, either version 3 of the License, or
    7     (at your option) any later version.
    8 
    9     This program is distributed in the hope that it will be useful,
   10     but WITHOUT ANY WARRANTY; without even the implied warranty of
   11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   12     GNU General Public License for more details.
   13 
   14     You should have received a copy of the GNU General Public License
   15     along with this program.  If not, see <http://www.gnu.org/licenses/>.
   16 */
   17 
   18 /*  Arg_parser reads the arguments in `argv' and creates a number of
   19     option codes, option arguments and non-option arguments.
   20 
   21     In case of error, `error' returns a non-empty error message.
   22 
   23     `options' is an array of `struct Option' terminated by an element
   24     containing a code which is zero. A null name means a short-only
   25     option. A code value outside the unsigned char range means a
   26     long-only option.
   27 
   28     Arg_parser normally makes it appear as if all the option arguments
   29     were specified before all the non-option arguments for the purposes
   30     of parsing, even if the user of your program intermixed option and
   31     non-option arguments. If you want the arguments in the exact order
   32     the user typed them, call `Arg_parser' with `in_order' = true.
   33 
   34     The argument `--' terminates all options; any following arguments are
   35     treated as non-option arguments, even if they begin with a hyphen.
   36 
   37     The syntax for optional option arguments is `-<short_option><argument>'
   38     (without whitespace), or `--<long_option>=<argument>'.
   39 */
   40 
   41 class Arg_parser
   42 {
   43 public:
   44     enum Has_arg { no, yes, maybe };
   45 
   46     struct Option {
   47         int code;           // Short option letter or code ( code != 0 )
   48         const char * name;      // Long option name (maybe null)
   49         Has_arg has_arg;
   50     };
   51 
   52 private:
   53     struct Record {
   54         int code;
   55         std::string argument;
   56         Record ( const int c = 0 ) : code ( c ) {}
   57     };
   58 
   59     std::string _error;
   60     std::vector< Record > data;
   61 
   62     bool parse_long_option ( const char * const opt, const char * const arg,
   63                              const Option options[], int & argind ) throw();
   64     bool parse_short_option ( const char * const opt, const char * const arg,
   65                               const Option options[], int & argind ) throw();
   66 
   67 public:
   68     Arg_parser ( const int argc, const char * const argv[],
   69                  const Option options[], const bool in_order = false ) throw();
   70 
   71     // Restricted constructor. Parses a single token and argument (if any)
   72     Arg_parser ( const char * const opt, const char * const arg,
   73                  const Option options[] ) throw();
   74 
   75     const std::string & error() const throw()
   76     {
   77         return _error;
   78     }
   79 
   80     // The number of arguments parsed (may be different from argc)
   81     int arguments() const throw()
   82     {
   83         return data.size();
   84     }
   85 
   86     // If code( i ) is 0, argument( i ) is a non-option.
   87     // Else argument( i ) is the option's argument (or empty).
   88     int code ( const int i ) const throw()
   89     {
   90         if ( i >= 0 && i < arguments() ) return data[i].code;
   91         else return 0;
   92     }
   93 
   94     const std::string & argument ( const int i ) const throw()
   95     {
   96         if ( i >= 0 && i < arguments() ) return data[i].argument;
   97         else return _error;
   98     }
   99 };