eldritch horrorsandjade
b0d7a81613
clangd broke because it can't look through symlinks. compile_commands manipulation does not fix it, clangd configuration does not fix it, a vfs overlay does not fix it, and while a combination of those can fix it with a bind mount in place that's just too cursed to even consider clangd bug: https://github.com/llvm/llvm-project/issues/116877 Change-Id: I8e3e8489548eb3a7aa65ac9d12a5ec8abf814aec
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
#pragma once
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///@file
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#include <tao/pegtl.hpp>
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namespace nix::parser {
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// modified copy of change_state, as the manual suggest for more involved
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// state manipulation. we want to change only the first state parameter,
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// and we care about the *initial* position of a rule application (not the
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// past-the-end position as pegtl change_state provides)
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template<typename NewState>
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struct change_head : tao::pegtl::maybe_nothing
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{
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template<
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typename Rule,
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tao::pegtl::apply_mode A,
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tao::pegtl::rewind_mode M,
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template<typename...> class Action,
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template<typename...> class Control,
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typename ParseInput,
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typename State,
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typename... States
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>
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[[nodiscard]] static bool match(ParseInput & in, State && st, States &&... sts)
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{
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const auto begin = in.iterator();
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if constexpr (std::is_constructible_v<NewState, State, States...>) {
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NewState s(st, sts...);
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if (tao::pegtl::match<Rule, A, M, Action, Control>(in, s, sts...)) {
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if constexpr (A == tao::pegtl::apply_mode::action) {
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_success<Action<Rule>>(0, begin, in, s, st, sts...);
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}
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return true;
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}
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return false;
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} else if constexpr (std::is_default_constructible_v<NewState>) {
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NewState s;
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if (tao::pegtl::match<Rule, A, M, Action, Control>(in, s, sts...)) {
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if constexpr (A == tao::pegtl::apply_mode::action) {
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_success<Action<Rule>>(0, begin, in, s, st, sts...);
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}
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return true;
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}
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return false;
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} else {
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static_assert(decltype(sizeof(NewState))(), "unable to instantiate new state");
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}
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}
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template<typename Target, typename ParseInput, typename... S>
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static void _success(void *, auto & begin, ParseInput & in, S & ... sts)
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{
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const typename ParseInput::action_t at(begin, in);
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Target::success(at, sts...);
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}
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template<typename Target, typename... S>
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static void _success(decltype(Target::success0(std::declval<S &>()...), 0), auto &, auto &, S & ... sts)
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{
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Target::success0(sts...);
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}
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};
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}
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