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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 "error.hpp"
#include <cstddef>
#include <string_view>
namespace math::server::lexer {
class Input {
public:
explicit Input(const std::string_view& input) : m_pos{0}, m_input{input} {}
const std::string_view& get_input() const { return m_input; }
std::size_t get_pos() const { return m_pos; }
std::size_t get_length() const { return m_input.length(); }
bool empty() const { return m_input.empty(); }
void consume(std::size_t len) {
if (m_input.length() < len) {
throw LexerError{"internal: not enough input to consume"};
}
m_pos += len;
m_input.remove_prefix(len);
}
void consume(const std::string_view& sub) { consume(sub.length()); }
private:
std::size_t m_pos;
std::string_view m_input;
};
} // namespace math::server::lexer
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