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+/* Arg_parser - A POSIX/GNU command line argument parser.
+ Copyright (C) 2006, 2007, 2008, 2009 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 );
+ bool parse_short_option( const char * const opt, const char * const arg,
+ const Option options[], int & argind );
+
+public:
+ Arg_parser( const int argc, const char * const argv[],
+ const Option options[], const bool in_order = false );
+
+ // Restricted constructor. Parses a single token and argument (if any)
+ Arg_parser( const char * const opt, const char * const arg,
+ const Option options[] );
+
+ 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_;
+ }
+ };