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+/* Arg_parser - POSIX/GNU command-line argument parser. (C++ version)
+ Copyright (C) 2006-2024 Antonio Diaz Diaz.
+
+ This library is free software. Redistribution and use in source and
+ binary forms, with or without modification, are permitted provided
+ that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions, and the following disclaimer.
+
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions, and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ 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.
+*/
+
+/* 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 long_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 * long_name; // Long option name (maybe null)
+ Has_arg has_arg;
+ };
+
+private:
+ struct Record
+ {
+ int code;
+ std::string parsed_name;
+ std::string argument;
+ explicit Record( const unsigned char c )
+ : code( c ), parsed_name( "-" ) { parsed_name += c; }
+ Record( const int c, const char * const long_name )
+ : code( c ), parsed_name( "--" ) { parsed_name += long_name; }
+ explicit Record( const char * const arg ) : code( 0 ), argument( arg ) {}
+ };
+
+ const std::string empty_arg;
+ 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 { return error_; }
+
+ // The number of arguments parsed. May be different from argc.
+ int arguments() const { 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
+ {
+ if( i >= 0 && i < arguments() ) return data[i].code;
+ else return 0;
+ }
+
+ // Full name of the option parsed (short or long).
+ const std::string & parsed_name( const int i ) const
+ {
+ if( i >= 0 && i < arguments() ) return data[i].parsed_name;
+ else return empty_arg;
+ }
+
+ const std::string & argument( const int i ) const
+ {
+ if( i >= 0 && i < arguments() ) return data[i].argument;
+ else return empty_arg;
+ }
+ };