Kurt Sassenrath
b2a6f25306
- proto::parser will likely contain helper functions for parsing messages from a buffer, for now it will explicitly define message parsers for each available message. It also leverages the new unpacker API, which has type safety in mind. These messages should not be unstructured, so it doesn't make sense to use the token API.
61 lines
2.3 KiB
C++
61 lines
2.3 KiB
C++
//-----------------------------------------------------------------------------
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// ___ __ _ _
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// / _ \__ _ _ __ ___ ___ / /(_)_ __ | | __
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// / /_)/ _` | '__/ __|/ _ \/ / | | '_ \| |/ /
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// / ___/ (_| | | \__ \ __/ /__| | | | | <
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// \/ \__,_|_| |___/\___\____/_|_| |_|_|\_\ .
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//
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//-----------------------------------------------------------------------------
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// Author: Kurt Sassenrath
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// Module: Proto
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//
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// Parser for extracting messages from msgpack.
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//
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// Note: Eventually, it would be nice to automatically generate the parser for
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// message structures. Definitions below are templated to allow for this.
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//
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// Copyright (c) 2023 Kurt Sassenrath.
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//
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// License TBD.
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//-----------------------------------------------------------------------------
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#ifndef parselink_proto_parser_ad351d41fe4c72dd
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#define parselink_proto_parser_ad351d41fe4c72dd
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#include "parselink/proto/error.h"
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#include "parselink/proto/message.h"
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#include <tl/expected.hpp>
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namespace parselink {
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namespace proto {
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////////////////////////////////////////////////////////////////////////////////
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// Default parse template instantiation -- unsupported message.
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////////////////////////////////////////////////////////////////////////////////
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template <message_type M>
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tl::expected<M, error> parse(std::span<std::byte const> data) noexcept {
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return tl::make_unexpected(error::unsupported);
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}
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////////////////////////////////////////////////////////////////////////////////
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// Currently-implemented message types.
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////////////////////////////////////////////////////////////////////////////////
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#define PARSELINK_PROTO_SUPPORTED_MESSAGE(msgtype) \
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tl::expected<msgtype, error> parse_##msgtype( \
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std::span<std::byte const> data) noexcept; \
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template <> \
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constexpr tl::expected<msgtype, error> parse( \
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std::span<std::byte const> data) noexcept { \
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return parse_##msgtype(data); \
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}
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PARSELINK_PROTO_SUPPORTED_MESSAGE(connect_message);
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#undef PARSELINK_PROTO_SUPPORTED_MESSAGE
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} // namespace proto
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} // namespace parselink
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#endif // parselink_proto_parser_ad351d41fe4c72dd
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