NSCharacterSet+SSYMoreCS.m

#import "NSCharacterSet+SSYMoreCS.h"

/* TODO: Test and see if the following performance optimization has any effect.
 If so, consider doing it for the other class methods in here. */
static NSCharacterSet* static_zeroWidthAndIllegalCharacterSet = nil;

@implementation NSCharacterSet (SSYMoreCS)

+ (NSCharacterSet*)printingAsciiCharacterSet {
	return [NSCharacterSet characterSetWithRange:NSMakeRange(0x21, 0x5f)] ;
}

+ (NSCharacterSet*)filenameLegalUnixCharacterSet {
	NSMutableCharacterSet* set = [[self printingAsciiCharacterSet] mutableCopy] ;
	// Remove the forward slash character
	[set removeCharactersInRange:NSMakeRange(0x2f, 1)] ;
	NSCharacterSet* answer = [set copy] ;
#if !__has_feature(objc_arc)
    [set release];
    [answer autorelease];
#endif
	return answer;
}

+ (NSCharacterSet*)filenameLegalMacUnixCharacterSet {
	NSMutableCharacterSet* set = [[self filenameLegalUnixCharacterSet] mutableCopy] ;
	// Remove the forward slash character
	[set removeCharactersInRange:NSMakeRange(0x3a, 1)] ;
	[set addCharactersInString:@" "] ;
	NSCharacterSet* answer = [set copy] ;
#if !__has_feature(objc_arc)
    [set release];
    [answer autorelease];
#endif
	return answer;
}

- (NSString*)stringOfAllCharacters {
	NSInteger i ;
	NSMutableString* string = [[NSMutableString alloc] init] ;
	for (i=0; i<0x10000; i++) {
		if ([[NSCharacterSet filenameLegalMacUnixCharacterSet] characterIsMember:(unichar)i]) {
			[string appendFormat:@"%c", (unichar)i] ;
		}
	}

    NSString* answer = [string copy];
#if !__has_feature(objc_arc)
    [answer autorelease];
#endif
	return answer;
}

+ (NSCharacterSet*)characterSetNotAllowedInUrlHost {
	return [[NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyz0123456789.-_"] invertedSet] ;
}

+ (NSCharacterSet*)ssyUsaKeyboardCharacterSet {
	return [NSCharacterSet characterSetWithCharactersInString:@"\r\t\n !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"] ;
}


+ (NSCharacterSet*)ssyHexDigitsCharacterSet {
	return [NSCharacterSet characterSetWithCharactersInString:@"abcdefABCDEF0123456789"] ;
}

+ (NSCharacterSet*)zeroWidthAndIllegalCharacterSet {
    if (!static_zeroWidthAndIllegalCharacterSet) {
        NSMutableCharacterSet* zeroWidthAndIllegalCharacterSet = [[NSCharacterSet controlCharacterSet] mutableCopy];
        [zeroWidthAndIllegalCharacterSet formIntersectionWithCharacterSet:[[NSCharacterSet whitespaceAndNewlineCharacterSet] invertedSet]];
        [zeroWidthAndIllegalCharacterSet formUnionWithCharacterSet:[NSCharacterSet illegalCharacterSet]];
        static_zeroWidthAndIllegalCharacterSet = [zeroWidthAndIllegalCharacterSet copy];
#if !__has_feature(objc_arc)
        [zeroWidthAndIllegalCharacterSet release];
#endif
    }

    return static_zeroWidthAndIllegalCharacterSet;
}
    
@end