//
//  NSString+SelectString.m
//  FireBoltt
//
//  Created by ecell on 2022/11/1.
//  Copyright © 2022 Sheldon. All rights reserved.
//

#import "NSString+SelectString.h"

@implementation NSString (SelectString)

- (NSString *)selcteStringWithSelectSatrt:(NSString *)startStr selecteEnd:(NSString *)endStr
{
    NSString *startRegStr = [startStr stringByReplacingOccurrencesOfString:@"[" withString:@"\\["];//转义[
    NSString *endRegStr = [endStr stringByReplacingOccurrencesOfString:@"[" withString:@"\\["];//转义[
    NSString *regStr = [NSString stringWithFormat:@"%@.*?%@",startRegStr,endRegStr];//拼接正则字符
    
    if (endStr.length == 0 )
    {
        regStr = [NSString stringWithFormat:@"%@.*",startRegStr];
    }
    
    if (startStr.length == 0)
    {
        regStr = [NSString stringWithFormat:@".*?%@",endStr];
    }
   
    //正则方法截取字符串
    NSRange codeRange = [self rangeOfString:regStr options:NSRegularExpressionSearch];
    NSString *return_code;
    if (codeRange.location != NSNotFound)
    {
        return_code = [self substringWithRange:codeRange];
        if (startStr.length)
        {
            return_code = [return_code stringByReplacingOccurrencesOfString:startStr withString:@""];
        }
        if (endStr.length)
        {
            return_code = [return_code stringByReplacingOccurrencesOfString:endStr withString:@""];
        }
    }
    else
    {
        return_code = @"字符串截取失败";
    }
    return return_code;
}

+ (NSString *)replaceUnicode:(NSString *)unicodeStr
{
    NSString *tempStr1 = [unicodeStr stringByReplacingOccurrencesOfString:@"\\u"withString:@"\\U"];
    NSString *tempStr2 = [tempStr1 stringByReplacingOccurrencesOfString:@"\""withString:@"\\\""];
    NSString *tempStr3 = [[@"\""stringByAppendingString:tempStr2] stringByAppendingString:@"\""];
    NSData *tempData = [tempStr3 dataUsingEncoding:NSUTF8StringEncoding];
    NSString* returnStr = [NSPropertyListSerialization propertyListFromData:tempData
                                                           mutabilityOption:NSPropertyListImmutable
                                                                     format:NULL
                                                           errorDescription:NULL];
    return [returnStr stringByReplacingOccurrencesOfString:@"\\r\\n"withString:@"\n"];
}

+(NSString *)utf8ToUnicode:(NSString *)string
{
    NSUInteger length = [string length];
    NSMutableString *str = [NSMutableString stringWithCapacity:0];
    for (int i = 0;i < length; i++){
        NSMutableString *s = [NSMutableString stringWithCapacity:0];
        unichar _char = [string characterAtIndex:i];
        // 判断是否为英文和数字
        if (_char <= '9' && _char >='0'){
            [s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i,1)]];
        }else if(_char >='a' && _char <= 'z'){
            [s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i,1)]];
        }else if(_char >='A' && _char <= 'Z')
        {
            [s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i,1)]];
        }else
        {
            // 中文和字符
            [s appendFormat:@"\\u%x",[string characterAtIndex:i]];
            // 不足位数补0 否则解码不成功
            if(s.length == 4)
            {
                [s insertString:@"00" atIndex:2];
            }
            else if (s.length == 5)
            {
                [s insertString:@"0" atIndex:2];
            }
        }
        [str appendFormat:@"%@", s];
    }
    return str;
}

@end