178 lines
4.4 KiB
Rust
178 lines
4.4 KiB
Rust
#[cfg_attr(
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not(any(feature = "full", feature = "derive")),
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allow(unknown_lints, unused_macro_rules)
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)]
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macro_rules! ast_struct {
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(
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[$($attrs_pub:tt)*]
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struct $name:ident #full $($rest:tt)*
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) => {
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#[cfg(feature = "full")]
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$($attrs_pub)* struct $name $($rest)*
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#[cfg(not(feature = "full"))]
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$($attrs_pub)* struct $name {
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_noconstruct: ::std::marker::PhantomData<::proc_macro2::Span>,
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}
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#[cfg(all(not(feature = "full"), feature = "printing"))]
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impl ::quote::ToTokens for $name {
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fn to_tokens(&self, _: &mut ::proc_macro2::TokenStream) {
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unreachable!()
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}
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}
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};
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(
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[$($attrs_pub:tt)*]
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struct $name:ident $($rest:tt)*
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) => {
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$($attrs_pub)* struct $name $($rest)*
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};
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($($t:tt)*) => {
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strip_attrs_pub!(ast_struct!($($t)*));
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};
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}
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macro_rules! ast_enum {
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// Drop the `#no_visit` attribute, if present.
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(
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[$($attrs_pub:tt)*]
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enum $name:ident #no_visit $($rest:tt)*
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) => (
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ast_enum!([$($attrs_pub)*] enum $name $($rest)*);
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);
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(
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[$($attrs_pub:tt)*]
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enum $name:ident $($rest:tt)*
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) => (
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$($attrs_pub)* enum $name $($rest)*
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);
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($($t:tt)*) => {
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strip_attrs_pub!(ast_enum!($($t)*));
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};
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}
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macro_rules! ast_enum_of_structs {
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(
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$(#[$enum_attr:meta])*
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$pub:ident $enum:ident $name:ident $body:tt
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$($remaining:tt)*
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) => {
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ast_enum!($(#[$enum_attr])* $pub $enum $name $body);
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ast_enum_of_structs_impl!($pub $enum $name $body $($remaining)*);
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};
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}
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macro_rules! ast_enum_of_structs_impl {
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(
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$pub:ident $enum:ident $name:ident {
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$(
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$(#[cfg $cfg_attr:tt])*
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$(#[doc $($doc_attr:tt)*])*
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$variant:ident $( ($($member:ident)::+) )*,
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)*
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}
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$($remaining:tt)*
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) => {
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check_keyword_matches!(pub $pub);
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check_keyword_matches!(enum $enum);
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$($(
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ast_enum_from_struct!($name::$variant, $($member)::+);
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)*)*
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#[cfg(feature = "printing")]
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generate_to_tokens! {
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$($remaining)*
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()
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tokens
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$name {
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$(
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$(#[cfg $cfg_attr])*
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$(#[doc $($doc_attr)*])*
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$variant $($($member)::+)*,
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)*
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}
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}
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};
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}
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macro_rules! ast_enum_from_struct {
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// No From<TokenStream> for verbatim variants.
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($name:ident::Verbatim, $member:ident) => {};
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($name:ident::$variant:ident, $member:ident) => {
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impl From<$member> for $name {
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fn from(e: $member) -> $name {
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$name::$variant(e)
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}
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}
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};
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}
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#[cfg(feature = "printing")]
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#[cfg_attr(
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not(any(feature = "full", feature = "derive")),
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allow(unknown_lints, unused_macro_rules)
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)]
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macro_rules! generate_to_tokens {
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(do_not_generate_to_tokens $($foo:tt)*) => ();
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(
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($($arms:tt)*) $tokens:ident $name:ident {
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$(#[cfg $cfg_attr:tt])*
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$(#[doc $($doc_attr:tt)*])*
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$variant:ident,
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$($next:tt)*
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}
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) => {
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generate_to_tokens!(
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($($arms)* $(#[cfg $cfg_attr])* $name::$variant => {})
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$tokens $name { $($next)* }
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);
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};
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(
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($($arms:tt)*) $tokens:ident $name:ident {
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$(#[cfg $cfg_attr:tt])*
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$(#[doc $($doc_attr:tt)*])*
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$variant:ident $member:ident,
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$($next:tt)*
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}
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) => {
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generate_to_tokens!(
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($($arms)* $(#[cfg $cfg_attr])* $name::$variant(_e) => _e.to_tokens($tokens),)
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$tokens $name { $($next)* }
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);
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};
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(($($arms:tt)*) $tokens:ident $name:ident {}) => {
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#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
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impl ::quote::ToTokens for $name {
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fn to_tokens(&self, $tokens: &mut ::proc_macro2::TokenStream) {
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match self {
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$($arms)*
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}
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}
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}
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};
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}
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macro_rules! strip_attrs_pub {
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($mac:ident!($(#[$m:meta])* $pub:ident $($t:tt)*)) => {
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check_keyword_matches!(pub $pub);
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$mac!([$(#[$m])* $pub] $($t)*);
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};
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}
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macro_rules! check_keyword_matches {
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(enum enum) => {};
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(pub pub) => {};
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}
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