//
//  NSString+FormEmoji.m
//  FMFormSubmitKit
//
//  Created by 周发明 on 2020/5/12.
//

#import "NSString+FormEmoji.h"

@implementation NSString (FormEmoji)

- (NSString *)noEmoji {
    //去除表情规则
    //  \u0020-\\u007E  标点符号，大小写字母，数字
    //  \u00A0-\\u00BE  特殊标点  (¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾)
    //  \u2E80-\\uA4CF  繁简中文,日文，韩文 彝族文字
    //  \uFE30-\\uFE4F  特殊标点(︴︵︶︷︸︹)
    //  \uFF00-\\uFFEF  日文  (ｵｶｷｸｹｺｻ)
    //  \u2000-\\u201f  特殊字符(‐‑‒–—―‖‗‘’‚‛“”„‟)
    // 注：对照表 http://blog.csdn.net/hherima/article/details/9045765

    NSRegularExpression* expression = [NSRegularExpression regularExpressionWithPattern:@"[^\\u0020-\\u007E\\u2E80-\\uA4CF\\uFF00-\\uFFEF\\r\n]" options:NSRegularExpressionCaseInsensitive error:nil];

    NSString* result = [expression stringByReplacingMatchesInString:self options:0 range:NSMakeRange(0, self.length) withTemplate:@""];

    return result;
}


- (NSString *)removeEmoji{
    if ([self containEmoji]) {
        return [self noEmoji];
    }
    return self;
}

- (BOOL)containEmoji
{
    NSUInteger len = [self lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
    if (len < 3) {  // 大于2个字符需要验证Emoji(有些Emoji仅三个字符)
        return NO;
    }
    
    // 仅考虑字节长度为3的字符,大于此范围的全部做Emoji处理
    NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding];
    
    Byte *bts = (Byte *)[data bytes];
    Byte bt;
    short v;
    for (NSUInteger i = 0; i < len; i++) {
        bt = bts[i];
        
        if ((bt | 0x7F) == 0x7F) {  // 0xxxxxxx  ASIIC编码
            continue;
        }
        if ((bt | 0x1F) == 0xDF) {  // 110xxxxx  两个字节的字符
            i += 1;
            continue;
        }
        if ((bt | 0x0F) == 0xEF) {  // 1110xxxx  三个字节的字符(重点过滤项目)
            // 计算Unicode下标
            v = bt & 0x0F;
            v = v << 6;
            v |= bts[i + 1] & 0x3F;
            v = v << 6;
            v |= bts[i + 2] & 0x3F;
            
            //            NSLog(@"%02X%02X", (Byte)(v >> 8), (Byte)(v & 0xFF));
            
            if ([self emojiInSoftBankUnicode:v] || [self emojiInUnicode:v]) {
                return YES;
            }
            
            i += 2;
            continue;
        }
        if ((bt | 0x3F) == 0xBF) {  // 10xxxxxx  10开头,为数据字节,直接过滤
            continue;
        }
        
        return YES;                 // 不是以上情况的字符全部超过三个字节,做Emoji处理
    }
    
    return NO;
}

- (BOOL)emojiInSoftBankUnicode:(short)code
{
    return ((code >> 8) >= 0xE0 && (code >> 8) <= 0xE5 && (Byte)(code & 0xFF) < 0x60);
}

- (BOOL)emojiInUnicode:(short)code
{
    if (code == 0x0023
        || code == 0x002A
        || (code >= 0x0030 && code <= 0x0039)
        || code == 0x00A9
        || code == 0x00AE
        || code == 0x203C
        || code == 0x2049
        || code == 0x2122
        || code == 0x2139
        || (code >= 0x2194 && code <= 0x2199)
        || code == 0x21A9 || code == 0x21AA
        || code == 0x231A || code == 0x231B
        || code == 0x2328
        || code == 0x23CF
        || (code >= 0x23E9 && code <= 0x23F3)
        || (code >= 0x23F8 && code <= 0x23FA)
        || code == 0x24C2
        || code == 0x25AA || code == 0x25AB
        || code == 0x25B6
        || code == 0x25C0
        || (code >= 0x25FB && code <= 0x25FE)
        || (code >= 0x2600 && code <= 0x2604)
        || code == 0x260E
        || code == 0x2611
        || code == 0x2614 || code == 0x2615
        || code == 0x2618
        || code == 0x261D
        || code == 0x2620
        || code == 0x2622 || code == 0x2623
        || code == 0x2626
        || code == 0x262A
        || code == 0x262E || code == 0x262F
        || (code >= 0x2638 && code <= 0x263A)
        || (code >= 0x2648 && code <= 0x2653)
        || code == 0x2660
        || code == 0x2663
        || code == 0x2665 || code == 0x2666
        || code == 0x2668
        || code == 0x267B
        || code == 0x267F
        || (code >= 0x2692 && code <= 0x2694)
        || code == 0x2696 || code == 0x2697
        || code == 0x2699
        || code == 0x269B || code == 0x269C
        || code == 0x26A0 || code == 0x26A1
        || code == 0x26AA || code == 0x26AB
        || code == 0x26B0 || code == 0x26B1
        || code == 0x26BD || code == 0x26BE
        || code == 0x26C4 || code == 0x26C5
        || code == 0x26C8
        || code == 0x26CE
        || code == 0x26CF
        || code == 0x26D1
        || code == 0x26D3 || code == 0x26D4
        || code == 0x26E9 || code == 0x26EA
        || (code >= 0x26F0 && code <= 0x26F5)
        || (code >= 0x26F7 && code <= 0x26FA)
        || code == 0x26FD
        || code == 0x2702
        || code == 0x2705
        || (code >= 0x2708 && code <= 0x270D)
        || code == 0x270F
        || code == 0x2712
        || code == 0x2714
        || code == 0x2716
        || code == 0x271D
        || code == 0x2721
        || code == 0x2728
        || code == 0x2733 || code == 0x2734
        || code == 0x2744
        || code == 0x2747
        || code == 0x274C
        || code == 0x274E
        || (code >= 0x2753 && code <= 0x2755)
        || code == 0x2757
        || code == 0x2763 || code == 0x2764
        || (code >= 0x2795 && code <= 0x2797)
        || code == 0x27A1
        || code == 0x27B0
        || code == 0x27BF
        || code == 0x2934 || code == 0x2935
        || (code >= 0x2B05 && code <= 0x2B07)
        || code == 0x2B1B || code == 0x2B1C
        || code == 0x2B50
        || code == 0x2B55
        || code == 0x3030
        || code == 0x303D
        || code == 0x3297
        || code == 0x3299
        // 第二段
        || code == 0x23F0) {
        return YES;
    }
    return NO;
}

@end
