diff options
Diffstat (limited to 'arg_parser.h')
| -rw-r--r-- | arg_parser.h | 69 |
1 files changed, 35 insertions, 34 deletions
diff --git a/arg_parser.h b/arg_parser.h index ceb9933..d9a4af0 100644 --- a/arg_parser.h +++ b/arg_parser.h @@ -1,43 +1,43 @@ -/* Arg_parser - POSIX/GNU command line argument parser. (C++ version) - Copyright (C) 2006-2019 Antonio Diaz Diaz. +/* Arg_parser - POSIX/GNU command line argument parser. (C++ version) + Copyright (C) 2006-2020 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: + 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. + 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. + 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. + 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. +/* 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. + 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. + '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. + 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 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>'. + The syntax for optional option arguments is '-<short_option><argument>' + (without whitespace), or '--<long_option>=<argument>'. */ class Arg_parser @@ -61,6 +61,7 @@ private: explicit Record( const char * const arg ) : code( 0 ), argument( arg ) {} }; + const std::string empty_arg; std::string error_; std::vector< Record > data; @@ -73,17 +74,17 @@ 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) + // 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) + // 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). + /* 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; @@ -93,6 +94,6 @@ public: const std::string & argument( const int i ) const { if( i >= 0 && i < arguments() ) return data[i].argument; - else return error_; + else return empty_arg; } }; |