//
// Created by liushuai on 2020年3月9日.
//
#include "digitToInteger.h"
#include <limits>
#include <iostream>
#include <regex>
int digitToInteger(std::string& s){
 int result = 0;
 int maxInt = INT32_MAX;
 int minInt = INT32_MIN;
 char pos=' ';
 for(auto elem:s){
 if(elem=='-'){
 pos = elem;
 continue;
 }else{
 if(pos=='-'){
 if(result<minInt/10||(result==minInt/10&&result%10>minInt%10))
 result = minInt;
 else
 result = result*10+(elem-'0');

 }else{
 if(result>maxInt/10||(result==maxInt/10&&result%10>maxInt%10)){
 result = maxInt;
 break;
 }else{
 result = result*10+(elem-'0');
 }
 }

 }
 }
 return result;
}
std::string illegal(std::string str){
 std::string result = "";
 if(str.size()<=0)
 return result;
 else{
 for(auto c:str){
 if(c=='-'||c==' '||(c>='0'&&c<='9')){
 if(c!=' '){
 result+=c;
 }
 }else{
 break;
 }
 }
 }
 return result;
}
int myAtoi(std::string str) {
 int result = 0;
 if(str!=""){
 std::string current = illegal(str);
// std::cout<<"current:"<<current<<"\n";
 result = digitToInteger(current);
 }

// if(regex_search(str,base_match,digit,std::regex_constants::match_continuous)){
// std::string match_result = base_match[0].str();
//// std::cout<<match_result<<"\n";
// result = digitToInteger(match_result);
// }
 return result;
}