/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3.0 only,
* as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* version 3.0 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3.0 along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#import "OFObject.h"
#import "OFString.h"
@class OFMapTable;
OF_ASSUME_NONNULL_BEGIN
/**
* @struct OFOptionsParserOption OFOptionsParser.h ObjFW/OFOptionsParser.h
*
* @brief An option which can be parsed by an @ref OFOptionsParser.
*/
typedef struct {
/** The short version (e.g. `-v`) of the option or `\0` for none. */
OFUnichar shortOption;
/**
* The long version (e.g. `--verbose`) of the option or `nil` for none.
*/
OFString *__unsafe_unretained _Nullable longOption;
/**
* Whether the option takes an argument.
*
* 0 means it takes no argument.@n
* 1 means it takes a required argument.@n
* -1 means it takes an optional argument.@n
*
* All other values are invalid and will throw an
* @ref OFInvalidArgumentException.
*/
signed char hasArgument;
/**
* An optional pointer to a bool that is set to whether the option has
* been specified.
*/
bool *_Nullable isSpecifiedPtr;
/**
* An optional pointer to an `OFString *` that is set to the
* argument specified for the option or `nil` for no argument.
*/
OFString *__autoreleasing _Nullable *_Nullable argumentPtr;
} OFOptionsParserOption;
/**
* @class OFOptionsParser OFOptionsParser.h ObjFW/OFOptionsParser.h
*
* @brief A class for parsing the program options specified on the command line.
*/
OF_SUBCLASSING_RESTRICTED
@interface OFOptionsParser: OFObject
{
OFOptionsParserOption *_options;
OFMapTable *_longOptions;
OFArray OF_GENERIC(OFString *) *_arguments;
size_t _index, _subIndex;
OFUnichar _lastOption;
OFString *_Nullable _lastLongOption, *_Nullable _argument;
bool _done;
}
/**
* @brief The last parsed option.
*
* If @ref nextOption returned `?` or `:`, this returns the option which was
* unknown or for which the argument was missing.@n
* If this returns `-`, the last option is only available as a long option (see
* lastLongOption).
*/
@property (readonly, nonatomic) OFUnichar lastOption;
/**
* @brief The long option for the last parsed option, or `nil` if the last
* parsed option was not passed as a long option by the user.
*
* In case @ref nextOption returned `?`, this contains the unknown long
* option.@n
* In case it returned `:`, this contains the long option which is missing an
* argument.@n
* In case it returned `=`, this contains the long option for which an
* argument was specified even though the option takes no argument.
*
* @warning Unlike @ref lastOption, which returns the short option even if the
* user specified a long option, this only returns the long option if
* it was actually specified as a long option by the user.
*/
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFString *lastLongOption;
/**
* @brief The argument for the last parsed option, or `nil` if the last parsed
* option takes no argument.
*/
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFString *argument;
/**
* @brief The arguments following the last option.
*/
@property (readonly, nonatomic)
OFArray OF_GENERIC(OFString *) *remainingArguments;
/**
* @brief Creates a new OFOptionsParser which accepts the specified options.
*
* @param options An array of @ref OFOptionsParserOption specifying all
* accepted options, terminated with an option whose short
* option is `\0` and long option is `nil`.
*
* @return A new, autoreleased OFOptionsParser
*/
+ (instancetype)parserWithOptions: (const OFOptionsParserOption *)options;
- (instancetype)init OF_UNAVAILABLE;
/**
* @brief Initializes an already allocated OFOptionsParser so that it accepts
* the specified options.
*
* @param options An array of @ref OFOptionsParserOption specifying all
* accepted options, terminated with an option whose short
* option is `\0` and long option is `nil`.
*
* @return An initialized OFOptionsParser
*/
- (instancetype)initWithOptions: (const OFOptionsParserOption *)options
OF_DESIGNATED_INITIALIZER;
/**
* @brief Returns the next option.
*
* If the option is only available as a long option, `-` is returned.
* Otherwise, the short option is returned, even if it was specified as a long
* option.@n
* If an unknown option is specified, `?` is returned.@n
* If the argument for the option is missing, `:` is returned.@n
* If there is an argument for the option even though it takes none, `=` is
* returned.@n
* If all options have been parsed, `\0` is returned.
*
* @note You need to call @ref nextOption repeatedly until it returns `\0` to
* make sure all options have been parsed, even if you only rely on the
* optional pointers specified and don't do any parsing yourself.
*
* @return The next option
*/
- (OFUnichar)nextOption;
@end
OF_ASSUME_NONNULL_END