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/* Arg_parser - A POSIX/GNU command line argument parser.
Copyright (C) 2006, 2007, 2008 Antonio Diaz Diaz.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Arg_parser reads the arguments in `argv' and creates a number of
option codes, option arguments and non-option arguments.
In case of error, `error' returns a non-empty error message.
`options' is an array of `struct Option' terminated by an element
containing a code which is zero. A null name means a short-only
option. A code value outside the unsigned char range means a
long-only option.
Arg_parser normally makes it appear as if all the option arguments
were specified before all the non-option arguments for the purposes
of parsing, even if the user of your program intermixed option and
non-option arguments. If you want the arguments in the exact order
the user typed them, call `Arg_parser' with `in_order' = true.
The argument `--' terminates all options; any following arguments are
treated as non-option arguments, even if they begin with a hyphen.
The syntax for optional option arguments is `-<short_option><argument>'
(without whitespace), or `--<long_option>=<argument>'.
*/
class Arg_parser
{
public:
enum Has_arg { no, yes, maybe };
struct Option
{
int code; // Short option letter or code ( code != 0 )
const char * name; // Long option name (maybe null)
Has_arg has_arg;
};
private:
struct Record
{
int code;
std::string argument;
Record ( const int c = 0 ) : code ( c ) {}
};
std::string _error;
std::vector< Record > data;
bool parse_long_option ( const char * const opt, const char * const arg,
const Option options[], int & argind ) throw();
bool parse_short_option ( const char * const opt, const char * const arg,
const Option options[], int & argind ) throw();
public:
Arg_parser ( const int argc, const char * const argv[],
const Option options[], const bool in_order = false ) throw();
// Restricted constructor. Parses a single token and argument (if any)
Arg_parser ( const char * const opt, const char * const arg,
const Option options[] ) throw();
const std::string & error() const throw() { return _error; }
// The number of arguments parsed (may be different from argc)
int arguments() const throw() { return data.size(); }
// If code( i ) is 0, argument( i ) is a non-option.
// Else argument( i ) is the option's argument (or empty).
int code ( const int i ) const throw()
{
if ( i >= 0 && i < arguments() ) return data[i].code;
else return 0;
}
const std::string & argument ( const int i ) const throw()
{
if ( i >= 0 && i < arguments() ) return data[i].argument;
else return _error;
}
};
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