//
//  NSString+Extensions.m
//  ShorthandMaster
//
//  Created by 明津李 on 2020/9/30.
//  Copyright © 2020 明津李. All rights reserved.
//

#import "NSString+Extensions.h"

@implementation NSString (Extensions)

- (BOOL)isContainEmoji {
    __block BOOL containsEmoji = NO;
    [self enumerateSubstringsInRange:NSMakeRange(0,[self length])
                             options:NSStringEnumerationByComposedCharacterSequences
                          usingBlock:^(NSString *substring,
                                       NSRange substringRange,
                                       NSRange enclosingRange,
                                       BOOL *stop) {
         const unichar hs = [substring characterAtIndex:0];
         // surrogate pair
         if (0xd800 <= hs && hs <= 0xdbff) {
             if (substring.length > 1) {
                 const unichar ls = [substring characterAtIndex:1];
                 const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
                 if (0x1d000 <= uc && uc <= 0x1fa95) {
                     containsEmoji = YES;
                 }
             }
         }else if (substring.length > 1) {
             const unichar ls = [substring characterAtIndex:1];
             if (ls == 0x20e3 ||
                 ls == 0xfe0f ||
                 ls == 0xd83c) {
                 containsEmoji = YES;
             }
         } else {
             // non surrogate
             if (0x2100 <= hs && hs <= 0x27ff) {
//                 containsEmoji = YES;
             }else if (0x2B05 <= hs && hs <= 0x2b07) {
                 containsEmoji = YES;
             } else if (0x2934 <= hs && hs <= 0x2935) {
                 containsEmoji = YES;
             }else if (0x3297 <= hs && hs <= 0x3299) {
                 containsEmoji = YES;
             }else if (hs == 0xa9 ||
                      hs == 0xae ||
                      hs == 0x303d ||
                      hs == 0x3030 ||
                      hs == 0x2b55 ||
                      hs == 0x2b1c ||
                      hs == 0x2b1b ||
                      hs == 0x2b50) {
                 containsEmoji = YES;
             }
         }
         if (containsEmoji) {
             *stop = YES;
         }
     }];
    return containsEmoji;
}


@end
