Text.cpp

/*
 * Reads text files
 *
 * Copyright (C) 2022 Marc S. Ressl
 */

#include <fstream>

#include "Text.h"

using namespace std;

/*
 * Converts a string into a Text (list of lines).
 *
 * Parameters:
 *  s -         String to convert
 *  text -      Destination text
 *
 * Returns: success.
 */
bool getText(const string &s, Text &text)
{
    text.clear();

    string::size_type pos = 0;
    string::size_type prev = 0;
    while ((pos = s.find('\n', prev)) != string::npos)
    {
        text.push_back(s.substr(prev, pos - prev));
        prev = pos + 1;
    }

    // To get the last substring (or only, if delimiter is not found)
    text.push_back(s.substr(prev));

    return true;
}

/*
 * Reads a text file into a Text (list of lines).
 *
 * Parameters:
 *  path -      Path of file to read
 *  text -      Destination text
 *
 * Returns: success.
 */
bool getTextFromFile(const string path, Text &text)
{
    ifstream file(path);

    if (file.is_open())
    {
        file.seekg(0, ios::end);
        int fileSize = file.tellg() > 1000000 ? 1000000 : (int)file.tellg();
        string fileData(fileSize, ' ');
        file.seekg(0);
        file.read(&fileData[0], fileSize);

        return !file.fail() && getText(fileData, text);
    }

    return false;
}