StringManip.h

#pragma once
 
#include <algorithm>
#include <cstdlib>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
 
namespace StringManip
{
 
template<std::ctype_base::mask mask>
class IsNot
{
    std::locale myLocale; // To ensure lifetime of facet...
    const std::ctype<char>* myCType;
 
public:
    explicit IsNot(const std::locale& l = std::locale()):
        myLocale(l),
        myCType(&std::use_facet<std::ctype<char>>(l))
    {
    }
 
    bool operator()(char ch) const
    {
        return !myCType->is(mask, ch);
    }
};
 
using IsNotSpace = IsNot<std::ctype_base::space>;
 
inline std::string trim(std::string_view original)
{
    auto right = std::find_if(original.rbegin(), original.rend(), IsNotSpace()).base();
    auto left = std::find_if(original.begin(), right, IsNotSpace());
    return std::string(left, right);
}
 
inline std::vector<std::string> split(std::string_view original, char delimiter = ' ')
{
    // TODO C++20 https://en.cppreference.com/w/cpp/ranges/split_view
    std::vector<std::string> strings;
    auto left = original.begin();
    for (auto it = left; it != original.end(); ++it)
    {
        if (*it == delimiter)
        {
            strings.emplace_back(&*left, it - left);
            left = it + 1;
        }
    }
    if (left != original.end())
    {
        strings.emplace_back(&*left, original.end() - left);
    }
    return strings;
}
 
inline std::vector<std::string> split(std::string_view original, std::string_view delimiter)
{
    size_t pos = 0;
    auto copy_original = trim(original);
    std::vector<std::string> result;
    while ((pos = copy_original.find(delimiter)) != std::string::npos)
    {
        result.push_back(copy_original.substr(0, pos));
        copy_original.erase(0, pos + delimiter.length());
    }
    if (!copy_original.empty())
    {
        result.push_back(copy_original);
    }
    return result;
}
 
class StringUtils
{
public:
    static std::string ToLowercase(std::string_view s)
    {
        std::string result;
        std::transform(s.cbegin(),
                       s.cend(),
                       std::back_inserter(result),
                       [](const char& c) { return std::tolower(c); });
        return result;
    }
 
    static bool contains(const std::string& v1, const std::string& v2)
    {
        return v1.find(v2) != std::string::npos;
    }
};
} // namespace StringManip