/*************************************************************************
> File Name: CharFilter.h
> Author: wangzhicheng
> Created Time: 2017-01-13
> Statement: input a string such as 12###12,34,,,@@12@
if you give a blank char to substitute for # , and @
output 12 12 34 12
************************************************************************/
#ifndef CHAT_FILTER_H
#define CHAT_FILTER_H
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <vector>
#include <string>
#include <bitset>
#include <algorithm>
namespace charfilter
{
using namespace std;
static const int ASCIILEN = 256;
class CharFilter
{
private:
char m_ReplacedChar;
// vector<int>m_vecHashHit; // 0 -- this position does not contain the filter character
bitset<ASCIILEN>m_vecHashHit; // 0 -- this position does not contain the filter character
public:
/*
* @brief construct m_vecHashHit
* */
CharFilter(const vector<char>&, char ch);
/*
* @brief filter the string
* */
void Filter(string &);
};
}
#endif
/*************************************************************************
> File Name: CharFilter.cpp
> Author: wangzhicheng
> Created Time: 2017-01-13
> Statement: input a string such as 12###12,34,,,@@12@
if you give a blank char to substitute for # , and @
output 12 12 34 12
************************************************************************/
#include "CharFilter.h"
namespace charfilter
{
/*
* @brief construct m_vecHashHit
* @filterchars include the characters which should be filtered
* @ch the substitued char such as blank character
* */
CharFilter::CharFilter(const vector<char>&filterchars, char ch)
{
int i;
int size = filterchars.size();
// m_vecHashHit.resize(ASCIILEN);
// init the m_vecHashHit
for(i = 0;i < size;i++)
{
int index = filterchars[i];
if(index >= 0 && index < ASCIILEN) m_vecHashHit[index] = 1;
}
m_ReplacedChar = ch;
}
/*
* @brief filter the string
* */
void CharFilter::Filter(string &str)
{
// for_each the string
for_each(str.begin(), str.end(), [this](char &ch)
{
if(ch >= 0 && ch < ASCIILEN && this->m_vecHashHit[ch])
{
ch = this->m_ReplacedChar;
}
});
// cope with the repeated replaced character
string::iterator it = unique(str.begin(), str.end(), [this](char ch0, char ch1)
{
return (this->m_ReplacedChar == ch0) && (this->m_ReplacedChar == ch1);
});
str.erase(it, str.end());
}
}
/*************************************************************************
> File Name: main.cpp
> Author: wangzhicheng >
> Created Time: Thu 12 Jan 2017 10:17:12 PM AWST
************************************************************************/
#include <iostream>
#include "CharFilter.h"
using namespace charfilter;
int main()
{
vector<char>chs;
chs.push_back('#');
chs.push_back('@');
chs.push_back(',');
CharFilter cf(chs, ' ');
string str;
getline(cin, str);
cout << "before filter str = " << str << endl;
cf.Filter(str);
cout << "after filter str = " << str << endl;
return 0;
}
CC=g++
all:
$(CC) -std=c++11 -g -o TestFilterChar CharFilter.h CharFilter.cpp main.cpp
