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// Copyright (c) 2019 Egor Tensin <egor@tensin.name>
// 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(std::string_view input) : m_pos{0}, m_input{input} {}
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(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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