//

//  CollectionUtils.h

//  MYUtilities

//

//  Created by Jens Alfke on 1/5/08.

//  Copyright 2008 Jens Alfke. All rights reserved.

//

#import <Foundation/Foundation.h>

// Collection creation conveniences:

#define $array(OBJS...)     ({id objs[]={OBJS}; \

                              [NSArray arrayWithObjects: objs count: sizeof(objs)/sizeof(id)];})

#define $marray(OBJS...)    ({id objs[]={OBJS}; \

                              [NSMutableArray arrayWithObjects: objs count: sizeof(objs)/sizeof(id)];})

#define $dict(PAIRS...)     ({struct _dictpair pairs[]={PAIRS}; \

                              _dictof(pairs,sizeof(pairs)/sizeof(struct _dictpair));})

#define $mdict(PAIRS...)    ({struct _dictpair pairs[]={PAIRS}; \

                              _mdictof(pairs,sizeof(pairs)/sizeof(struct _dictpair));})

#define $object(VAL)        ({__typeof(VAL) v=(VAL); _box(&v,@encode(__typeof(v)));})

// Apply a selector to each array element, returning an array of the results:

NSArray* $apply( NSArray *src, SEL selector, id defaultValue );

NSArray* $applyKeyPath( NSArray *src, NSString *keyPath, id defaultValue );

// Object conveniences:

BOOL $equal(id obj1, id obj2);      // Like -isEqual: but works even if either/both are nil

NSString* $string( const char *utf8Str );

#define $sprintf(FORMAT, ARGS... )  [NSString stringWithFormat: (FORMAT), ARGS]

#define $cast(CLASSNAME,OBJ)        ((CLASSNAME*)(_cast([CLASSNAME class],(OBJ))))

#define $castNotNil(CLASSNAME,OBJ)  ((CLASSNAME*)(_castNotNil([CLASSNAME class],(OBJ))))

#define $castIf(CLASSNAME,OBJ)      ((CLASSNAME*)(_castIf([CLASSNAME class],(OBJ))))

#define $castArrayOf(ITEMCLASSNAME,OBJ) _castArrayOf([ITEMCLASSNAME class],(OBJ)))

void setObj( id *var, id value );

BOOL ifSetObj( id *var, id value );

void setString( NSString **var, NSString *value );

BOOL ifSetString( NSString **var, NSString *value );

#define $true   ((NSNumber*)kCFBooleanTrue)

#define $false  ((NSNumber*)kCFBooleanFalse)

@interface NSArray (MYUtils)

- (BOOL) my_containsObjectIdenticalTo: (id)object;

@end

@interface NSSet (MYUtils)

+ (NSSet*) my_unionOfSet: (NSSet*)set1 andSet: (NSSet*)set2;

+ (NSSet*) my_intersectionOfSet: (NSSet*)set1 andSet: (NSSet*)set2;

+ (NSSet*) my_differenceOfSet: (NSSet*)set1 andSet: (NSSet*)set2;

@end

#pragma mark -

#pragma mark FOREACH:

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5

#define foreach(VAR,ARR) for(VAR in ARR)

#else

struct foreachstate {NSArray *array; unsigned n, i;};

static inline struct foreachstate _initforeach( NSArray *arr ) {

    struct foreachstate s;

    s.array = arr;

    s.n = [arr count];

    s.i = 0;

    return s;

}

#define foreach(VAR,ARR) for( struct foreachstate _s = _initforeach((ARR)); \

                                   _s.i<_s.n && ((VAR)=[_s.array objectAtIndex: _s.i], YES); \

                                   _s.i++ )

#endif

// Internals (don't use directly)

struct _dictpair { id key; id value; };

NSDictionary* _dictof(const struct _dictpair*, size_t count);

NSMutableDictionary* _mdictof(const struct _dictpair*, size_t count);

NSValue* _box(const void *value, const char *encoding);

id _cast(Class,id);

id _castNotNil(Class,id);

id _castIf(Class,id);

NSArray* _castArrayOf(Class,NSArray*);