Utils.cpp

//
// Created by Raffaele Montella on 13/12/20.
//

#include "Utils.hpp"



std::string Utils::getEnvVar(std::string const &key) {
    char *val = getenv(key.c_str());
    return val == NULL ? std::string("") : std::string(val);
}

void Utils::tokenize(string &str, char delim, vector<string> &out)
{
    size_t start;
    size_t end = 0;

    while ((start = str.find_first_not_of(delim, end)) != string::npos)
    {
        end = str.find(delim, start);
        out.push_back(str.substr(start, end - start));
    }
}

std::string Utils::trim(const std::string& str,
                         const std::string& whitespace = " \t")
{
    const auto strBegin = str.find_first_not_of(whitespace);
    if (strBegin == std::string::npos)
        return ""; // no content

    const auto strEnd = str.find_last_not_of(whitespace);
    const auto strRange = strEnd - strBegin + 1;

    return str.substr(strBegin, strRange);
}

std::string Utils::reduce(const std::string& str,
                           const std::string& fill = " ",
                           const std::string& whitespace = " \t")
{
    // trim first
    auto result = trim(str, whitespace);

    // replace sub ranges
    auto beginSpace = result.find_first_of(whitespace);
    while (beginSpace != std::string::npos)
    {
        const auto endSpace = result.find_first_not_of(whitespace, beginSpace);
        const auto range = endSpace - beginSpace;

        result.replace(beginSpace, range, fill);

        const auto newStart = beginSpace + fill.length();
        beginSpace = result.find_first_of(whitespace, newStart);
    }

    return result;
}

Utils::~Utils() = default;

Utils::Utils()  = default;