Utility.cpp

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// The Reactive C++ Toolbox.
// Copyright (C) 2013-2019 Swirly Cloud Limited
// Copyright (C) 2021 Reactive Markets Limited
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#include "Utility.hpp"
 
#include <boost/spirit/home/qi/numeric/real.hpp>
#include <boost/spirit/home/qi/parse.hpp>
 
namespace toolbox {
inline namespace util {
using namespace std;
 
bool stob(string_view sv, bool dfl) noexcept
{
    bool val{dfl};
    switch (sv.size()) {
    case 1:
        switch (sv[0]) {
        case '0':
        case 'F':
        case 'N':
        case 'f':
        case 'n':
            val = false;
            break;
        case '1':
        case 'T':
        case 'Y':
        case 't':
        case 'y':
            val = true;
            break;
        }
        break;
    case 2:
        if ((sv[0] == 'N' || sv[0] == 'n') //
            && (sv[1] == 'O' || sv[1] == 'o')) {
            val = false;
        } else if ((sv[0] == 'O' || sv[0] == 'o') //
                   && (sv[1] == 'N' || sv[1] == 'n')) {
            val = true;
        }
        break;
    case 3:
        if ((sv[0] == 'O' || sv[0] == 'o')    //
            && (sv[1] == 'F' || sv[1] == 'f') //
            && (sv[2] == 'F' || sv[2] == 'f')) {
            val = false;
        } else if ((sv[0] == 'Y' || sv[0] == 'y')    //
                   && (sv[1] == 'E' || sv[1] == 'e') //
                   && (sv[2] == 'S' || sv[2] == 's')) {
            val = true;
        }
        break;
    case 4:
        if ((sv[0] == 'T' || sv[0] == 't')    //
            && (sv[1] == 'R' || sv[1] == 'r') //
            && (sv[2] == 'U' || sv[2] == 'u') //
            && (sv[3] == 'E' || sv[3] == 'e')) {
            val = true;
        }
        break;
    case 5:
        if ((sv[0] == 'F' || sv[0] == 'f')    //
            && (sv[1] == 'A' || sv[1] == 'a') //
            && (sv[2] == 'L' || sv[2] == 'l') //
            && (sv[3] == 'S' || sv[3] == 's') //
            && (sv[4] == 'E' || sv[4] == 'e')) {
            val = false;
        }
        break;
    }
    return val;
}
 
double stod(std::string_view sv, double dfl) noexcept
{
    using namespace boost::spirit;
    double val{};
    if (!qi::parse(sv.begin(), sv.end(), qi::double_, val)) {
        return dfl;
    }
    return val;
}
 
} // namespace util
} // namespace toolbox