/**
* argparser – command line argument parser library
*
* Copyright © 2013, 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef ARGPARSER_H
#define ARGPARSER_H
#include <stddef.h>
#include <stdio.h>
#ifndef ARGS_CONST
# define ARGS_CONST __attribute__((const))
#endif
#ifndef ARGS_PURE
# define ARGS_PURE __attribute__((pure))
#endif
/**
* Option types
*/
typedef enum args_option_type
{
/**
* The option never takes any arguments
*/
ARGUMENTLESS,
/**
* The option takes the next argument
*/
ARGUMENTED,
/**
* The option may have an argument, either sticky
* or otherwise accepted by `stickless`
*/
OPTARGUMENTED,
/**
* The option takes all following options
*/
VARIADIC
} args_option_type_t;
/**
* Tristate type
*/
typedef enum args_tristate
{
/**
* False
*/
FALSE,
/**
* True
*/
TRUE,
/**
* Automatic
*/
AUTO
} args_tristate_t;
typedef struct args_option
{
/**
* The type of the option
*/
args_option_type_t type;
/**
* Alterative option names
*/
const char** alternatives;
/**
* Number of elements in `alternatives`
*/
size_t alternatives_count;
/**
* Standard option name
*/
const char* standard;
/**
* Argument name, not for argumentless options
*/
const char* argument;
/**
* Help text, multi-line
*/
const char* help;
/**
* User-data used by methods associated with the option
*/
void* user_data;
/**
* Invoked when the option is used
*
* @param user_data User-data
* @param standard The used option alternative
* @param used The standard option alternative
*/
void (*trigger)(void* user_data, const char* standard, const char* used);
/**
* Invoked when the option is used
*
* @param user_data User-data
* @param standard The used option alternative
* @param used The standard option alternative
* @param value The used value
*/
void (*trigger_v)(void* user_data, const char* standard, const char* used, char* value);
/**
* Should return true if the next argument can used for the argument without being sticky
*
* @param user_data User-data
* @param argument The next argument
* @return Whether the argument can be used without being sticky
*/
int (*stickless)(void* user_data, const char* argument);
/**
* Should return true if the next argument can used for the argument
*
* @param user_data User-data
* @param value The next argument
* @return Whether the argument can be used
*/
int (*variadic_end)(void* user_data, char* value);
} args_option_t;
/**
* Settings for argument parser
*/
typedef struct args_settings
{
/**
* Whether the Linux VT is being used
*/
int linuxvt;
/**
* Whether to use single dash/plus long options
*/
int alternative;
/**
* Whether to all arguments after the first file
* should also be parsed as files
*/
int stop_at_first_file;
/**
* Whether to use colours
*/
args_tristate_t use_colours;
/**
* The name of the executed command, will be freed by the parser
*/
char* program;
/**
* Short, single-line, description of the program
*/
const char* description;
/**
* Formated, multi-line, usage text, `NULL` if none
*/
const char* usage;
/**
* Long, multi-line, description of the program, `NULL` if none
*/
const char* longdescription;
/**
* The error output stream
*/
FILE* error_out;
/**
* The warning output stream
*/
FILE* warning_out;
/**
* The help output stream
*/
FILE* help_out;
/**
* Abbreviated option expander, `NULL` for disabled
*
* @param argument The option that not recognised
* @param options All recognised options, order by order of appearance in the help, i.e. by inclusion
* @param standards The corresponding standard option for options in `options`, as a consequence of
* the order in `options` all identical values (will have identical address) in
* `standards` will directly follow eachother
* @param count The number of elements in `options` and `standards`
* @return The only possible expansion, otherwise `NULL`
*/
const char* (*abbreviations)(const char* stub, const char** options, const char** standards, size_t count);
} args_settings_t;
/**
* The state of the parser
*/
typedef struct args_state
{
/**
* The passed arguments
*/
char** arguments;
/**
* The number of passed arguments
*/
size_t arguments_count;
/**
* The number of unrecognised arguments
*/
size_t unrecognised_count;
/**
* The concatenation of `files` with blankspaces as delimiters, `NULL` if no files
*/
char* message;
/**
* The arguments passed that is not tied to an option
*/
char** files;
/**
* The number of elements in `files`
*/
size_t files_count;
/**
* Options, in order
*/
args_option* options;
/**
* Number of elements in `options`
*/
size_t options_count;
/**
* All recognised options
*/
const char** all_options;
/**
* The standard argument for all recognised options,
* if `all_options_standard[i] == all_options_standard[j]`,
* then `all_options[i]` and `all_options[j]` are synonyms
*/
const char** all_options_standard;
/**
* Number of elements in `all_options` and `all_options_standard`
*/
size_t all_options_count;
/**
* Queue of objects that needs to be freed on dispose
*/
void** freequeue;
/**
* The number of elements in `freequeue`
*/
ssize_t freeptr;
} args_state_t;
/**
* Argument parser class
*/
typedef struct args_parser
{
/**
* Settings for argument parser
*/
args_settings_t settings;
/**
* The state of the parser
*/
args_state_t state;
} args_parser_t;
/**
* Initialise an argument parser
*
* @param parser The memory address of the parser to initialise
* @return Zero on success, -1 on error, `errno` will be set accordingly
*/
int args_initialise(args_parser_t* parser);
/**
* Disposes of all resources, run this when you are done
*
* @param parser The parser
*/
void args_dispose(parser_t* parser);
/**
* Checks the correctness of the number of used non-option arguments
*
* @param parser The parser
* @param min The minimum number of files
* @return Whether the usage was correct
*/
int args_test_files_min(args_parser_t* parser, size_t min);
/**
* Checks the correctness of the number of used non-option arguments
*
* @param parser The parser
* @param max The maximum number of files
* @return Whether the usage was correct
*/
int args_test_files_max(args_parser_t* parser, size_t max);
/**
* Checks the correctness of the number of used non-option arguments
*
* @param parser The parser
* @param min The minimum number of files
* @param max The maximum number of files
* @return Whether the usage was correct
*/
int args_test_files(args_parser_t* parser, size_t min, size_t max);
/**
* Dummy trigger
*
* @param user_data User-data
* @param used The used option alternative
* @param standard The standard option alternative
*/
void args_noop_trigger(void* user_data, const char* used, const char* standard) ARGS_CONST;
/**
* Dummy trigger
*
* @param user_data User-data
* @param used The used option alternative
* @param standard The standard option alternative
* @param value The used value
*/
void args_noop_trigger_v(void* user_data, const char* used, const char* standard, char* value) ARGS_CONST;
/**
* Stickless evaluator to always evaluates to false
*
* @param user_data User-data
* @param argument The next argument
* @return Whether the argument can be used without being sticky
*/
int args_no_stickless(void* user_data, const char* value) ARGS_CONST;
/**
* Default stickless evaluator
*
* @param user_data User-data
* @param argument The next argument
* @return Whether the argument can be used without being sticky
*/
int args_default_stickless(void* user_data, const char* argument) ARGS_CONST;
/**
* Evalutator for end argument of variadic options that always evalutes to false
*
* @param user_data User-data
* @param value The next argument
* @return Whether the argument can be used without being sticky
*/
int args_no_variadic_end(void* user_data, char* value) ARGS_CONST;
/**
* The standard abbrevation expander
*
* @param argument The option that not recognised
* @param standards The corresponding standard option for options in `options`
* @param count The number of elements in `options` and `standards`
* @return The only possible expansion, otherwise `NULL`
*/
const char* args_standard_abbreviations(const char* argument, const char** options, const char** standards, size_t count);
#endif
