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/*
 * Copyright (c) 2008-2022 Jonathan Schleifer <js@nil.im>
 * Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

#include <stdlib.h>

#import "OFSet.h"
#import "OFArray.h"
#import "OFMapTableSet.h"
#import "OFNull.h"
#import "OFString.h"
#import "OFXMLElement.h"
#import "OFConcreteSet.h"
#import "OFCountedSet.h"
#import "OFNull.h"
#import "OFString.h"

static struct {
	Class isa;
} placeholder;

@interface OFSetPlaceholder: OFSet
@interface OFPlaceholderSet: OFSet
@end

@implementation OFSetPlaceholder
@implementation OFPlaceholderSet
#ifdef __clang__
/* We intentionally don't call into super, so silence the warning. */
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wunknown-pragmas"
# pragma clang diagnostic ignored "-Wobjc-designated-initializers"
#endif
- (instancetype)init
{
	return (id)[[OFMapTableSet alloc] init];
	return (id)[[OFConcreteSet alloc] init];
}

- (instancetype)initWithSet: (OFSet *)set
{
	return (id)[[OFMapTableSet alloc] initWithSet: set];
	return (id)[[OFConcreteSet alloc] initWithSet: set];
}

- (instancetype)initWithArray: (OFArray *)array
{
	return (id)[[OFMapTableSet alloc] initWithArray: array];
	return (id)[[OFConcreteSet alloc] initWithArray: array];
}

- (instancetype)initWithObjects: (id)firstObject, ...
{
	id ret;
	va_list arguments;

	va_start(arguments, firstObject);
	ret = [[OFMapTableSet alloc] initWithObject: firstObject
	ret = [[OFConcreteSet alloc] initWithObject: firstObject
					  arguments: arguments];
	va_end(arguments);

	return ret;
}

- (instancetype)initWithObjects: (id const *)objects count: (size_t)count
{
	return (id)[[OFMapTableSet alloc] initWithObjects: objects
	return (id)[[OFConcreteSet alloc] initWithObjects: objects
						    count: count];
}

- (instancetype)initWithObject: (id)firstObject arguments: (va_list)arguments
{
	return (id)[[OFMapTableSet alloc] initWithObject: firstObject
	return (id)[[OFConcreteSet alloc] initWithObject: firstObject
					       arguments: arguments];
}

#ifdef __clang__
- (instancetype)initWithSerialization: (OFXMLElement *)element
{
	return (id)[[OFMapTableSet alloc] initWithSerialization: element];
}

# pragma clang diagnostic pop
- (instancetype)retain
{
	return self;
}

#endif
- (instancetype)autorelease
{

	return self;
}

OF_SINGLETON_METHODS
- (void)release
{
}

- (void)dealloc
{
	OF_DEALLOC_UNSUPPORTED
}
@end

@implementation OFSet
+ (void)initialize
{
	if (self == [OFSet class])
		placeholder.isa = [OFSetPlaceholder class];
		object_setClass((id)&placeholder, [OFPlaceholderSet class]);
}

+ (instancetype)alloc
{
	if (self == [OFSet class])
		return (id)&placeholder;

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{
	return [[[self alloc] initWithObjects: objects
					count: count] autorelease];
}

- (instancetype)init
{
	if ([self isMemberOfClass: [OFSet class]]) {
	if ([self isMemberOfClass: [OFSet class]] ||
	    [self isMemberOfClass: [OFMutableSet class]] ||
	    [self isMemberOfClass: [OFCountedSet class]]) {
		@try {
			[self doesNotRecognizeSelector: _cmd];
		} @catch (id e) {
			[self release];
			@throw e;
		}

		abort();
	}

	return [super init];
}

- (instancetype)initWithSet: (OFSet *)set
{
	id *objects = NULL;
	size_t count;
	OF_INVALID_INIT_METHOD
}

	@try {
		void *pool = objc_autoreleasePoolPush();
		size_t i = 0;

		count = set.count;
		objects = OFAllocMemory(count, sizeof(id));

		for (id object in set) {
			OFEnsure(i < count);
			objects[i++] = object;
		}

		objc_autoreleasePoolPop(pool);
	} @catch (id e) {
		OFFreeMemory(objects);

		[self release];
		@throw e;
	}

	@try {
		self = [self initWithObjects: objects count: count];
	} @finally {
		OFFreeMemory(objects);
	}

	return self;
}

- (instancetype)initWithArray: (OFArray *)array
{
	void *pool = objc_autoreleasePoolPush();
	size_t count;
	const id *objects;
	OF_INVALID_INIT_METHOD
}

	@try {
		count = array.count;
		objects = array.objects;
	} @catch (id e) {
		[self release];
		@throw e;
	}

	self = [self initWithObjects: objects count: count];

	objc_autoreleasePoolPop(pool);

	return self;
}

#ifdef __clang__
/* We intentionally don't call into super, so silence the warning. */
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wunknown-pragmas"
# pragma clang diagnostic ignored "-Wobjc-designated-initializers"
#endif
- (instancetype)initWithObjects: (id const *)objects count: (size_t)count
{
	OF_INVALID_INIT_METHOD
}
#ifdef __clang__
# pragma clang diagnostic pop
#endif

- (instancetype)initWithObjects: (id)firstObject, ...
{
	id ret;
	va_list arguments;

	va_start(arguments, firstObject);
	ret = [self initWithObject: firstObject arguments: arguments];
	va_end(arguments);

	return ret;
}

- (instancetype)initWithObject: (id)firstObject arguments: (va_list)arguments
{
	size_t count = 1;
	va_list argumentsCopy;
	id *objects;
	OF_INVALID_INIT_METHOD
}

	if (firstObject == nil)
		return [self init];

	va_copy(argumentsCopy, arguments);
	while (va_arg(argumentsCopy, id) != nil)
		count++;

	@try {
		objects = OFAllocMemory(count, sizeof(id));
	} @catch (id e) {
		[self release];
		@throw e;
	}
- (instancetype)initWithSerialization: (OFXMLElement *)element
{
	OF_INVALID_INIT_METHOD

	@try {
		objects[0] = firstObject;

		for (size_t i = 1; i < count; i++) {
			objects[i] = va_arg(arguments, id);
			OFEnsure(objects[i] != nil);
		}

		self = [self initWithObjects: objects count: count];
	} @finally {
		OFFreeMemory(objects);
	}

	return self;
}

- (size_t)count
{
	OF_UNRECOGNIZED_SELECTOR
}

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	OF_UNRECOGNIZED_SELECTOR
}

- (int)countByEnumeratingWithState: (OFFastEnumerationState *)state
			   objects: (id *)objects
			     count: (int)count
{
	static unsigned long dummyMutations;
	OFEnumerator *enumerator;
	int i;

	memcpy(&enumerator, state->extra, sizeof(enumerator));

	if (enumerator == nil) {
		enumerator = [self objectEnumerator];
		memcpy(state->extra, &enumerator, sizeof(enumerator));
	}

	state->itemsPtr = objects;
	state->mutationsPtr = (unsigned long *)self;
	state->mutationsPtr = &dummyMutations;

	for (i = 0; i < count; i++) {
		id object = [enumerator nextObject];

		if (object == nil)
			return i;

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	for (id object in self)
		if ([set containsObject: object])
			return true;

	return false;
}

- (OFXMLElement *)XMLElementBySerializing
{
	void *pool = objc_autoreleasePoolPush();
	OFXMLElement *element;

	if ([self isKindOfClass: [OFMutableSet class]])
		element = [OFXMLElement elementWithName: @"OFMutableSet"
					      namespace: OFSerializationNS];
	else
		element = [OFXMLElement elementWithName: @"OFSet"
					      namespace: OFSerializationNS];

	for (id <OFSerialization> object in self) {
		void *pool2 = objc_autoreleasePoolPush();
		[element addChild: object.XMLElementBySerializing];
		objc_autoreleasePoolPop(pool2);
	}

	[element retain];

	objc_autoreleasePoolPop(pool);

	return [element autorelease];
}

- (OFSet *)setByAddingObjectsFromSet: (OFSet *)set
{
	OFMutableSet *new = [[self mutableCopy] autorelease];
	[new unionSet: set];
	[new makeImmutable];
	return new;
}