Keyboard.mm

//==============================================================================
//
//  Emoji Filtering: unicode magic

#if FILTER_EMOJIS_IOS_KEYBOARD
static bool StringContainsEmoji(NSString *string)
{
	__block BOOL returnValue = NO;

	[string enumerateSubstringsInRange:NSMakeRange(0, string.length)
		options:NSStringEnumerationByComposedCharacterSequences
		usingBlock:^(NSString* substring, NSRange substringRange, NSRange enclosingRange, BOOL* stop)
		{
			const unichar hs = [substring characterAtIndex:0];
			const unichar ls = substring.length > 1 ? [substring characterAtIndex:1] : 0;

			#define IS_IN(val, min, max) (((val) >= (min)) && ((val) <= (max)))

			if(IS_IN(hs, 0xD800, 0xDBFF))
			{
				if(substring.length > 1)
				{
					const int uc = ((hs - 0xD800) * 0x400) + (ls - 0xDC00) + 0x10000;

					// Musical: [U+1D000, U+1D24F]
					// Enclosed Alphanumeric Supplement: [U+1F100, U+1F1FF]
					// Enclosed Ideographic Supplement: [U+1F200, U+1F2FF]
					// Miscellaneous Symbols and Pictographs: [U+1F300, U+1F5FF]
					// Supplemental Symbols and Pictographs: [U+1F900, U+1F9FF]
					// Emoticons: [U+1F600, U+1F64F]
					// Transport and Map Symbols: [U+1F680, U+1F6FF]
					if(IS_IN(uc, 0x1D000, 0x1F9FF))
						returnValue = YES;
				}
			}
			else if(substring.length > 1 && ls == 0x20E3)
			{
				// emojis for numbers: number + modifier ls = U+20E3
				returnValue = YES;
			}
			else
			{
				if(		// Latin-1 Supplement
						hs == 0x00A9 || hs == 0x00AE
						// General Punctuation
					||	hs == 0x203C || hs == 0x2049
						// Letterlike Symbols
					||	hs == 0x2122 || hs == 0x2139
						// Arrows
					||	IS_IN(hs, 0x2194, 0x2199) || IS_IN(hs, 0x21A9, 0x21AA)
						// Miscellaneous Technical
					||	IS_IN(hs, 0x231A, 0x231B) || IS_IN(hs, 0x23E9, 0x23F3) || IS_IN(hs, 0x23F8, 0x23FA) || hs == 0x2328 || hs == 0x23CF
						// Geometric Shapes
					||	IS_IN(hs, 0x25AA, 0x25AB) || IS_IN(hs, 0x25FB, 0x25FE) || hs == 0x25B6 || hs == 0x25C0
						// Miscellaneous Symbols
					||	IS_IN(hs, 0x2600, 0x2604) || IS_IN(hs, 0x2614, 0x2615) || IS_IN(hs, 0x2622, 0x2623) || IS_IN(hs, 0x262E, 0x262F)
					||	IS_IN(hs, 0x2638, 0x263A) || IS_IN(hs, 0x2648, 0x2653) || IS_IN(hs, 0x2665, 0x2666) || IS_IN(hs, 0x2692, 0x2694)
					||	IS_IN(hs, 0x2696, 0x2697) || IS_IN(hs, 0x269B, 0x269C) || IS_IN(hs, 0x26A0, 0x26A1) || IS_IN(hs, 0x26AA, 0x26AB)
					||	IS_IN(hs, 0x26B0, 0x26B1) || IS_IN(hs, 0x26BD, 0x26BE) || IS_IN(hs, 0x26C4, 0x26C5) || IS_IN(hs, 0x26CE, 0x26CF)
					||	IS_IN(hs, 0x26D3, 0x26D4) || IS_IN(hs, 0x26D3, 0x26D4) || IS_IN(hs, 0x26E9, 0x26EA) || IS_IN(hs, 0x26F0, 0x26F5)
					||	IS_IN(hs, 0x26F7, 0x26FA)
					||	hs == 0x260E || hs == 0x2611 || hs == 0x2618 || hs == 0x261D || hs == 0x2620 || hs == 0x2626 || hs == 0x262A
					||	hs == 0x2660 || hs == 0x2663 || hs == 0x2668 || hs == 0x267B || hs == 0x267F || hs == 0x2699 || hs == 0x26C8
					||	hs == 0x26D1 || hs == 0x26FD
						// Dingbats
					||	IS_IN(hs, 0x2708, 0x270D) || IS_IN(hs, 0x2733, 0x2734) || IS_IN(hs, 0x2753, 0x2755)
					||	IS_IN(hs, 0x2763, 0x2764) || IS_IN(hs, 0x2795, 0x2797)
					||	hs == 0x2702 || hs == 0x2705 || hs == 0x270F || hs == 0x2712 || hs == 0x2714 || hs == 0x2716 || hs == 0x271D
					||	hs == 0x2721 || hs == 0x2728 || hs == 0x2744 || hs == 0x2747 || hs == 0x274C || hs == 0x274E || hs == 0x2757
					||	hs == 0x27A1 || hs == 0x27B0 || hs == 0x27BF
						// CJK Symbols and Punctuation
					||	hs == 0x3030 || hs == 0x303D
						// Enclosed CJK Letters and Months
					||	hs == 0x3297 || hs == 0x3299
						// Supplemental Arrows-B
					||	IS_IN(hs, 0x2934, 0x2935)
						// Miscellaneous Symbols and Arrows
					||	IS_IN(hs, 0x2B05, 0x2B07) || IS_IN(hs, 0x2B1B, 0x2B1C) || hs == 0x2B50 || hs == 0x2B55
				)
				{
					returnValue = YES;
				}
			}

			#undef IS_IN
	}];

	return returnValue;
}