#include <fstream>
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#include <iostream>
#include <string>
#include "ichar_traits.h"
using namespace std;

istring getData(string filename) throw(std::ifstream::failure)
{
    std::ifstream streamReader(filename, std::ios::binary);
    if (!streamReader.is_open())
        throw std::ifstream::failure("file couldn't open");
    streamReader.seekg(0, std::ios::end);     // 游标移到文件结尾
    unsigned filesize = streamReader.tellg(); // 获取游标当前位置 - 文件开始位置，此处为文件大小
    char *_data = new char[filesize];         // 分配内存
    streamReader.seekg(0, std::ios::beg);     // 跳转回开始
    streamReader.read(_data, filesize);       // 读取文件
    streamReader.close();
    istring data(_data);
    delete[] _data;
    return std::move(data);
}

istring &replaceAll(istring &context,
                    const istring &from,
                    const istring &to)
{
    size_t lookHere = 0;
    size_t foundHere;
    while ((foundHere = context.find(from, lookHere)) != istring::npos) // find from lookHere
    {                                                                  // to avoid the string
        context.replace(foundHere, from.size(), to);                   //"to" is the substr
        lookHere = foundHere + to.size();                              // of "from"
#ifdef SHOWREPLACE
        cout << "stringNumber:" << foundHere << endl;
#endif
    }
    return context;
}

int main(int argc, char const *argv[])
{
    istring fileTxt = getData("Rparse.h");
    cout<<fileTxt<<endl;
    replaceAll(fileTxt,"Size","Hello");
    cout<<fileTxt<<endl;
    return 0;
}