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// Copyright (c) 2019 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "math-server" project.
// For details, see https://github.com/egor-tensin/math-server.
// Distributed under the MIT License.
#pragma once
#include "token_type.hpp"
#include <cstddef>
#include <string_view>
#include <utility>
#include <variant>
namespace math::server::lexer {
class Token {
public:
using Type = token::Type;
explicit Token(token::Type type);
explicit Token(double value);
bool operator==(const Token& other) const;
bool operator!=(const Token& other) const { return !(*this == other); }
Type get_type() const { return m_type; }
double as_number() const;
private:
token::Type m_type;
std::variant<double> m_value;
friend std::ostream& operator<<(std::ostream&, const Token&);
};
class ParsedToken : public Token {
public:
ParsedToken(Token&& token, std::size_t pos, const std::string_view& view)
: Token{std::move(token)}, m_pos{pos}, m_view{view} {}
std::size_t get_pos() const { return m_pos; }
std::size_t get_length() const { return m_view.length(); }
private:
std::size_t m_pos;
std::string_view m_view;
};
} // namespace math::server::lexer
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