mirror of
https://github.com/boostorg/mqtt5.git
synced 2025-11-04 09:51:37 +01:00
61f17f6e0f
Summary: related to T11798 Reviewers: ivica Reviewed By: ivica Subscribers: miljen, iljazovic Differential Revision: https://repo.mireo.local/D27532
464 lines
11 KiB
C++
464 lines
11 KiB
C++
#ifndef ASYNC_MQTT5_BASE_DECODERS_HPP
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#define ASYNC_MQTT5_BASE_DECODERS_HPP
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#include <boost/spirit/home/x3.hpp>
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#include <boost/spirit/home/x3/binary/binary.hpp>
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#include <boost/fusion/adapted/std_tuple.hpp>
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#include <async_mqtt5/property_types.hpp>
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#include <async_mqtt5/impl/codecs/traits.hpp>
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namespace async_mqtt5::decoders {
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namespace x3 = boost::spirit::x3;
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template <typename T>
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struct convert { using type = T; };
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template <typename ...Args>
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struct convert<boost::fusion::deque<Args...>> {
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using type = std::tuple<typename convert<Args>::type...>;
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};
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template <typename T>
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struct convert<boost::optional<T>> {
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using type = std::optional<T>;
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};
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template <typename T>
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struct convert<std::vector<T>> {
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using type = std::vector<typename convert<T>::type>;
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};
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template <typename T, typename Parser>
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constexpr auto as(Parser&& p) {
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return x3::rule<struct _, T>{} = std::forward<Parser>(p);
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}
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template <typename It, typename Parser>
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auto type_parse(It& first, const It last, const Parser& p) {
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using ctx_type = decltype(x3::make_context<struct _>(std::declval<Parser&>()));
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using attr_type = typename x3::traits::attribute_of<Parser, ctx_type>::type;
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using rv_type = typename convert<attr_type>::type;
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std::optional<rv_type> rv;
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rv_type value {};
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if (x3::phrase_parse(first, last, as<rv_type>(p), x3::eps(false), value))
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rv = std::move(value);
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return rv;
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}
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template <typename AttributeType, typename It, typename Parser>
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auto type_parse(It& first, const It last, const Parser& p) {
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std::optional<AttributeType> rv;
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AttributeType value {};
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if (x3::phrase_parse(first, last, as<AttributeType>(p), x3::eps(false), value))
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rv = std::move(value);
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return rv;
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}
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namespace basic {
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template <typename T>
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constexpr auto to(T& arg) {
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return [&](auto& ctx) {
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using ctx_type = decltype(ctx);
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using attr_type = decltype(x3::_attr(std::declval<const ctx_type&>()));
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if constexpr (is_boost_iterator<attr_type>)
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arg = T { x3::_attr(ctx).begin(), x3::_attr(ctx).end() };
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else
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arg = x3::_attr(ctx);
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};
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}
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template <typename LenParser, typename Subject, typename Enable = void>
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class scope_limit {};
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template <typename LenParser, typename Subject>
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class scope_limit<
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LenParser, Subject,
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std::enable_if_t<x3::traits::is_parser<LenParser>::value>
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> :
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public x3::unary_parser<Subject, scope_limit<LenParser, Subject>>
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{
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using base_type = x3::unary_parser<Subject, scope_limit<LenParser, Subject>>;
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LenParser _lp;
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public:
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using ctx_type =
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decltype(x3::make_context<struct _>(std::declval<Subject&>()));
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using attribute_type =
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typename x3::traits::attribute_of<Subject, ctx_type>::type;
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static bool const has_attribute = true;
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scope_limit(const LenParser& lp, const Subject& subject) :
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base_type(subject), _lp(lp)
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{}
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template <typename It, typename Ctx, typename RCtx, typename Attr>
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bool parse(
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It& first, const It last,
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const Ctx& ctx, RCtx& rctx, Attr& attr
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) const {
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It iter = first;
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typename x3::traits::attribute_of<LenParser, Ctx>::type len;
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if (!_lp.parse(iter, last, ctx, rctx, len))
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return false;
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if (iter + len > last)
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return false;
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if (!base_type::subject.parse(iter, iter + len, ctx, rctx, attr))
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return false;
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first = iter;
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return true;
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}
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};
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template <typename Size, typename Subject>
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class scope_limit<
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Size, Subject,
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std::enable_if_t<std::is_arithmetic_v<Size>>
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> :
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public x3::unary_parser<Subject, scope_limit<Size, Subject>>
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{
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using base_type = x3::unary_parser<Subject, scope_limit<Size, Subject>>;
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size_t _limit;
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public:
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using ctx_type =
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decltype(x3::make_context<struct _>(std::declval<Subject&>()));
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using attribute_type =
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typename x3::traits::attribute_of<Subject, ctx_type>::type;
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static bool const has_attribute = true;
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scope_limit(Size limit, const Subject& subject) :
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base_type(subject), _limit(limit)
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{}
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template <typename It, typename Ctx, typename RCtx, typename Attr>
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bool parse(
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It& first, const It last,
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const Ctx& ctx, RCtx& rctx, Attr& attr
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) const {
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It iter = first;
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if (iter + _limit > last)
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return false;
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if (!base_type::subject.parse(iter, iter + _limit, ctx, rctx, attr))
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return false;
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first = iter;
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return true;
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}
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};
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template <typename LenParser, typename Enable = void>
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struct scope_limit_gen {
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template <typename Subject>
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auto operator[](const Subject& p) const {
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return scope_limit<LenParser, Subject> { _lp, x3::as_parser(p) };
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}
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LenParser _lp;
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};
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template <typename Size>
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struct scope_limit_gen<
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Size,
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std::enable_if_t<std::is_arithmetic_v<Size>>
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> {
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template <typename Subject>
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auto operator[](const Subject& p) const {
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return scope_limit<Size, Subject> { limit, x3::as_parser(p) };
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}
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Size limit;
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};
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template <
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typename Parser,
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std::enable_if_t<x3::traits::is_parser<Parser>::value, bool> = true
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>
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scope_limit_gen<Parser> scope_limit_(const Parser& p) {
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return { p };
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}
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template <
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typename Size,
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std::enable_if_t<std::is_arithmetic_v<Size>, bool> = true
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>
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scope_limit_gen<Size> scope_limit_(Size limit) {
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return { limit };
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}
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struct verbatim_parser : x3::parser<verbatim_parser> {
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using attribute_type = std::string;
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static bool const has_attribute = true;
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template <typename It, typename Ctx, typename RCtx, typename Attr>
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bool parse(It& first, const It last, const Ctx&, RCtx&, Attr& attr) const {
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attr = std::string { first, last };
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first = last;
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return true;
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}
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};
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constexpr auto verbatim_ = verbatim_parser{};
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struct varint_parser : x3::parser<varint_parser> {
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using attribute_type = uint32_t;
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static bool const has_attribute = true;
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template <typename It, typename Ctx, typename RCtx, typename Attr>
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bool parse(
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It& first, const It last,
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const Ctx& ctx, RCtx&, Attr& attr
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) const {
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It iter = first;
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x3::skip_over(iter, last, ctx);
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if (iter == last)
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return false;
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uint32_t result = 0; unsigned bit_shift = 0;
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for (; iter != last && bit_shift < sizeof(int32_t) * 7; ++iter) {
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auto val = *iter;
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if (val & 0b1000'0000u) {
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result |= (val & 0b0111'1111u) << bit_shift;
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bit_shift += 7;
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}
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else {
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result |= (static_cast<int32_t>(val) << bit_shift);
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bit_shift = 0;
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break;
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}
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}
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if (bit_shift)
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return false;
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attr = result;
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first = ++iter;
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return true;
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}
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};
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constexpr varint_parser varint_{};
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struct len_prefix_parser : x3::parser<len_prefix_parser> {
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using attribute_type = std::string;
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static bool const has_attribute = true;
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template <typename It, typename Ctx, typename RCtx, typename Attr>
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bool parse(
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It& first, const It last,
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const Ctx& ctx, RCtx& rctx, Attr& attr
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) const {
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It iter = first;
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x3::skip_over(iter, last, ctx);
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typename x3::traits::attribute_of<decltype(x3::big_word), Ctx>::type len;
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if (x3::big_word.parse(iter, last, ctx, rctx, len)) {
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if (std::distance(iter, last) < len)
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return false;
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}
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else
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return false;
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attr = std::string(iter, iter + len);
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first = iter + len;
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return true;
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}
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};
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constexpr len_prefix_parser utf8_{};
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constexpr len_prefix_parser binary_{};
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/*
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Boost Spirit incorrectly deduces atribute type for a parser of the form
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(eps(a) | parser1) >> (eps(b) | parser)
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and we had to create if_ parser to remedy the issue
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*/
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template <typename Subject>
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class conditional_parser :
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public x3::unary_parser<Subject, conditional_parser<Subject>> {
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using base_type = x3::unary_parser<Subject, conditional_parser<Subject>>;
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bool _condition;
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public:
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using ctx_type =
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decltype(x3::make_context<struct _>(std::declval<Subject&>()));
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using subject_attr_type =
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typename x3::traits::attribute_of<Subject, ctx_type>::type;
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using attribute_type = boost::optional<subject_attr_type>;
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static bool const has_attribute = true;
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conditional_parser(const Subject& s, bool condition) :
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base_type(s), _condition(condition) {}
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template <typename It, typename Ctx, typename RCtx, typename Attr>
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bool parse(
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It& first, const It last,
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const Ctx& ctx, RCtx& rctx, Attr& attr
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) const {
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if (!_condition)
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return true;
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It iter = first;
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subject_attr_type sattr {};
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if (!base_type::subject.parse(iter, last, ctx, rctx, sattr))
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return false;
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attr.emplace(std::move(sattr));
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first = iter;
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return true;
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}
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};
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struct conditional_gen {
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bool _condition;
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template <typename Subject>
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auto operator[](const Subject& p) const {
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return conditional_parser<Subject> { p, _condition };
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}
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};
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inline conditional_gen if_(bool condition) {
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return { condition };
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}
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} // end namespace basic
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namespace prop {
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namespace basic = async_mqtt5::decoders::basic;
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namespace detail {
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template <typename It, typename Ctx, typename RCtx, typename Prop>
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bool parse_to_prop(
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It& iter, const It last,
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const Ctx& ctx, RCtx& rctx, Prop& prop
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) {
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using prop_type = decltype(prop);
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bool rv = false;
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if constexpr (is_optional<prop_type>) {
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using value_type =
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typename std::remove_reference_t<prop_type>::value_type;
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if constexpr (std::is_same_v<value_type, uint8_t>) {
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uint8_t attr;
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rv = x3::byte_.parse(iter, last, ctx, rctx, attr);
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prop = attr;
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}
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if constexpr (std::is_same_v<value_type, int16_t>) {
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int16_t attr;
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rv = x3::big_word.parse(iter, last, ctx, rctx, attr);
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prop = attr;
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}
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if constexpr (std::is_same_v<value_type, uint16_t>) {
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uint16_t attr;
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rv = x3::big_word.parse(iter, last, ctx, rctx, attr);
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prop = attr;
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}
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if constexpr (std::is_same_v<value_type, int32_t>) {
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int32_t attr;
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rv = x3::big_dword.parse(iter, last, ctx, rctx, attr);
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prop = attr;
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}
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if constexpr (std::is_same_v<value_type, uint32_t>) {
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uint32_t attr;
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rv = basic::varint_.parse(iter, last, ctx, rctx, attr);
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prop = attr;
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}
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if constexpr (std::is_same_v<value_type, std::string>) {
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std::string attr;
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rv = basic::utf8_.parse(iter, last, ctx, rctx, attr);
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prop.emplace(std::move(attr));
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}
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}
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if constexpr (async_mqtt5::is_vector<prop_type>) {
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std::string value;
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// key
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rv = basic::utf8_.parse(iter, last, ctx, rctx, value);
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if (rv) prop.push_back(std::move(value));
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// value
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rv = basic::utf8_.parse(iter, last, ctx, rctx, value);
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if (rv) prop.push_back(std::move(value));
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}
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return rv;
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}
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} // end namespace detail
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template <typename Props>
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class prop_parser : public x3::parser<prop_parser<Props>> {
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public:
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using attribute_type = Props;
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static bool const has_attribute = true;
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template <typename It, typename Ctx, typename RCtx, typename Attr>
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bool parse(
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It& first, const It last,
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const Ctx& ctx, RCtx& rctx, Attr& attr
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) const {
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It iter = first;
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x3::skip_over(iter, last, ctx);
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if (iter == last)
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return true;
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uint32_t props_length;
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if (!basic::varint_.parse(iter, last, ctx, rctx, props_length))
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return false;
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const It scoped_last = iter + props_length;
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// attr = Props{};
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while (iter < scoped_last) {
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uint8_t prop_id = *iter++;
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bool rv = true;
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It saved = iter;
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attr.apply_on(
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prop_id,
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[&rv, &iter, scoped_last, &ctx, &rctx](auto& prop) {
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rv = detail::parse_to_prop(
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iter, scoped_last, ctx, rctx, prop
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);
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}
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);
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// either rv = false or property with prop_id was not found
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if (!rv || iter == saved)
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return false;
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}
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first = iter;
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return true;
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}
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};
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template <typename Props>
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constexpr auto props_ = prop_parser<Props> {};
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} // end namespace prop
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} // end namespace async_mqtt5::decoders
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#endif // !ASYNC_MQTT5_BASE_DECODERS_HPP
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