Files_CW02_v3.cpp

/*
Дан текстовый файл f.
Слова в файле разделены одним или группой пробелов.
Удалить из файла все однобуквенные слова и лишние пробелы.
Результат записать в файл g.
*/

#include <iostream>
#include <fstream>
#include <string>
#include <regex>

using namespace std;

void readFileText(ifstream &f, char fileName[20]);
void writeFileText(ofstream &f, char fileName[20]);
void reformatFileText(ifstream &iFile, ofstream &oFile, char sourceFileName[20], char resultFileName[20]);

int n;

int main()
{
    char sourceFileName[20], resultFileName[20], action;
    ifstream iFile;
    ofstream oFile;

    cout << "Please enter surce file name: ";
    cin >> sourceFileName;
    cout << "Please enter result file name: ";
    cin >> resultFileName;

restartMark:
    cout << "Read source (r). Write source (w). Reformat (c). Read result (d). Exit (e). ? ";
    cin >> action;

    switch (action) {
    case 'r':
    case 'R':
        readFileText(iFile, sourceFileName);
        break;
    case 'w':
    case 'W':
        writeFileText(oFile, sourceFileName);
        break;
    case 'c':
    case 'C':
        reformatFileText(iFile, oFile, sourceFileName, resultFileName);
        break;
    case 'd':
    case 'D':
        readFileText(iFile, resultFileName);
        break;
    default:
        return 0;
    }

    goto restartMark;

    return 0;
}

void readFileText(ifstream &f, char fileName[20])
{
    string line;

    cout << "Reading file \"" << fileName << "\":" << endl;

    f.open(fileName);

    if (f.is_open()) {
        while (getline(f, line)) {
            cout << line << endl;
        }

        f.close();
    }
    else {
        cout << "An error ocured while reading file." << endl;
    }
}

void writeFileText(ofstream &f, char fileName[20])
{
    string line;
    int compareLineFlag;

    cout << "Writing file \"" << fileName << "\" (type \"done\" to finish):" << endl;
    cin.ignore();

    f.open(fileName);

    if (f.is_open()) {
        do {
            getline(cin, line);
            compareLineFlag = line.compare("done");

            if (compareLineFlag) {
                f << line << endl;
            }
        } while (compareLineFlag);

        f.close();

        cout << "File \"" << fileName << "\" successfully writed." << endl;
    }
    else {
        cout << "An error ocured while writing file." << endl;
    }
}

void reformatFileText(ifstream &iFile, ofstream &oFile, char sourceFileName[20], char resultFileName[20])
{
    string line;
    regex a("[ ]{2,}"), b("\\b[^ ] ");

    cout << "Reading file \"" << sourceFileName << "\":" << endl;
    cin.ignore();

    iFile.open(sourceFileName, ios::binary | ios::in);
    oFile.open(resultFileName, ios::binary | ios::out);

    if (iFile.is_open() && oFile.is_open()) {
        while (getline(iFile, line)) {
            line = regex_replace(line, a, " ");
            line += ' ';
            line = regex_replace(line, b, "");
            line = line.substr(0, line.size() - 1);
            oFile << line << endl;
        }

        iFile.close();
        oFile.close();
        cout << "File \"" << resultFileName << "\" successfully writed." << endl;
    }
    else {
        cout << "An error ocured while opening file." << endl;
    }
}