column.hpp

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//
// Struct column
//
// Copyright (c) 2015, Christof Metzger-Kraus, Helmholtz-Zentrum Berlin
// All rights reserved
//
// This file is part of OPAL.
//
// OPAL is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// You should have received a copy of the GNU General Public License
// along with OPAL. If not, see <https://www.gnu.org/licenses/>.
//
#ifndef COLUMN_HPP_
#define COLUMN_HPP_
 
#include "Util/SDDSParser/ast.hpp"
#include "Util/SDDSParser/value_parser.hpp"
 
#include <array>
#include <cstddef>
#include <iostream>
#include <optional>
#include <ostream>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
 
namespace SDDS {
    struct column {
        enum class attributes {
            NAME,
            SYMBOL,
            UNITS,
            DESCRIPTION,
            FORMAT_STRING,
            TYPE,
            FIELD_LENGTH
        };
 
        unsigned int order_m { 0 };
        std::optional<std::string> name_m;
        std::optional<std::string> units_m;
        std::optional<std::string> description_m;
        std::optional<ast::dataType> type_m;
        ast::columnData_t values_m;
        static unsigned int count_m;
 
        bool checkMandatories() const {
            return name_m && type_m;
        }
 
        template <attributes A>
        struct complainUnsupported {
            static bool apply() {
                constexpr std::array<std::pair<attributes, std::string_view>, 3> unsupportedAttributeNames = {{
                    { attributes::SYMBOL, "symbol" },
                    { attributes::FORMAT_STRING, "format_string" },
                    { attributes::FIELD_LENGTH, "field_length" }
                }};
 
                for (const auto& item : unsupportedAttributeNames) {
                    if (item.first == A) {
                        std::cerr << item.second << " not supported yet" << std::endl;
                        return false;
                    }
                }
 
                return true;
            }
        };
 
        bool parse(std::string_view input, size_t& pos) {
            if (!type_m) {
                return false;
            }
            // GCC false positive: variant construction inside vector growth is
            // misdiagnosed as reading an uninitialized local.
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
            parser::ValueParser parser(input, pos);
            switch(*this->type_m) {
                case ast::dataType::FLOAT: {
                    float f = 0.0f;
                    if (parser.parseFloat(f)) {
                        this->values_m.push_back(f);
                        pos = parser.getPosition();
                        return true;
                    }
                    break;
                }
                case ast::dataType::DOUBLE: {
                    double d = 0.0;
                    if (parser.parseDouble(d)) {
                        this->values_m.push_back(d);
                        pos = parser.getPosition();
                        return true;
                    }
                    break;
                }
                case ast::dataType::SHORT: {
                    short s = 0;
                    if (parser.parseShort(s)) {
                        this->values_m.push_back(s);
                        pos = parser.getPosition();
                        return true;
                    }
                    break;
                }
                case ast::dataType::LONG: {
                    long l = 0;
                    if (parser.parseLong(l)) {
                        this->values_m.push_back(l);
                        pos = parser.getPosition();
                        return true;
                    }
                    break;
                }
                case ast::dataType::CHARACTER: {
                    char c = '\0';
                    if (parser.parseChar(c)) {
                        this->values_m.push_back(c);
                        pos = parser.getPosition();
                        return true;
                    }
                    break;
                }
                case ast::dataType::STRING: {
                    std::string s("");
                    if (parser.parseString(s)) {
                        this->values_m.push_back(s);
                        pos = parser.getPosition();
                        return true;
                    }
                    break;
                }
            }
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic pop
#endif
            return false;
        }
    };
 
    struct columnList : std::vector<column> {};
 
    template <typename Iterator>
    struct columnOrder {
        template <typename, typename>
        struct result {
            typedef void type;
        };
 
        void operator()(column& col, Iterator) const {
            col.order_m = column::count_m ++;
        }
    };
 
    inline std::ostream& operator<<(std::ostream& out, const column& col) {
        if (col.name_m) out << "name = " << *col.name_m << ", ";
        if (col.units_m) out << "units = " << *col.units_m << ", ";
        if (col.description_m) out << "description = " << *col.description_m << ", ";
        out << "order = " << col.order_m;
 
        return out;
    }
}
 
#endif /* COLUMN_HPP_ */