| 1 | |
| 2 |
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| 3 | #[cfg_attr(
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| 4 | not(any(feature = "full", feature = "derive")),
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| 5 | allow(unknown_lints, unused_macro_rules)
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| 6 | )]
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| 7 | macro_rules! ast_struct {
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| 8 | (
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| 9 | $(#[$attr:meta])*
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| 10 | $pub:ident $struct:ident $name:ident #full $body:tt
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| 11 | ) => {
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| 12 | check_keyword_matches!(pub $pub);
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| 13 | check_keyword_matches!(struct $struct);
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| 14 |
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| 15 | #[cfg(feature = "full")]
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| 16 | $(#[$attr])* $pub $struct $name $body
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| 17 |
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| 18 | #[cfg(not(feature = "full"))]
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| 19 | $(#[$attr])* $pub $struct $name {
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| 20 | _noconstruct: ::std::marker::PhantomData<::proc_macro2::Span>,
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| 21 | }
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| 22 |
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| 23 | #[cfg(all(not(feature = "full"), feature = "printing"))]
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| 24 | impl ::quote::ToTokens for $name {
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| 25 | fn to_tokens(&self, _: &mut ::proc_macro2::TokenStream) {
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| 26 | unreachable!()
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| 27 | }
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| 28 | }
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| 29 | };
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| 30 |
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| 31 | (
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| 32 | $(#[$attr:meta])*
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| 33 | $pub:ident $struct:ident $name:ident $body:tt
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| 34 | ) => {
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| 35 | check_keyword_matches!(pub $pub);
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| 36 | check_keyword_matches!(struct $struct);
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| 37 |
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| 38 | $(#[$attr])* $pub $struct $name $body
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| 39 | };
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| 40 | }
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| 41 |
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| 42 | #[cfg(any(feature = "full", feature = "derive"))]
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| 43 | macro_rules! ast_enum {
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| 44 | (
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| 45 | $(#[$enum_attr:meta])*
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| 46 | $pub:ident $enum:ident $name:ident $body:tt
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| 47 | ) => {
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| 48 | check_keyword_matches!(pub $pub);
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| 49 | check_keyword_matches!(enum $enum);
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| 50 |
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| 51 | $(#[$enum_attr])* $pub $enum $name $body
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| 52 | };
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| 53 | }
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| 54 |
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| 55 | macro_rules! ast_enum_of_structs {
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| 56 | (
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| 57 | $(#[$enum_attr:meta])*
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| 58 | $pub:ident $enum:ident $name:ident $body:tt
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| 59 | ) => {
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| 60 | check_keyword_matches!(pub $pub);
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| 61 | check_keyword_matches!(enum $enum);
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| 62 |
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| 63 | $(#[$enum_attr])* $pub $enum $name $body
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| 64 |
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| 65 | ast_enum_of_structs_impl!($name $body);
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| 66 |
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| 67 | #[cfg(feature = "printing")]
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| 68 | generate_to_tokens!(() tokens $name $body);
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| 69 | };
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| 70 | }
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| 71 |
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| 72 | macro_rules! ast_enum_of_structs_impl {
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| 73 | (
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| 74 | $name:ident {
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| 75 | $(
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| 76 | $(#[cfg $cfg_attr:tt])*
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| 77 | $(#[doc $($doc_attr:tt)*])*
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| 78 | $variant:ident $( ($member:ident) )*,
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| 79 | )*
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| 80 | }
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| 81 | ) => {
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| 82 | $($(
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| 83 | ast_enum_from_struct!($name::$variant, $member);
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| 84 | )*)*
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| 85 | };
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| 86 | }
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| 87 |
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| 88 | macro_rules! ast_enum_from_struct {
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| 89 | |
| 90 | ($name:ident::Verbatim, $member:ident) => {};
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| 91 |
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| 92 | ($name:ident::$variant:ident, $member:ident) => {
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| 93 | impl From<$member> for $name {
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| 94 | fn from(e: $member) -> $name {
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| 95 | $name::$variant(e)
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| 96 | }
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| 97 | }
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| 98 | };
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| 99 | }
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| 100 |
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| 101 | #[cfg(feature = "printing")]
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| 102 | macro_rules! generate_to_tokens {
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| 103 | (
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| 104 | ($($arms:tt)*) $tokens:ident $name:ident {
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| 105 | $(#[cfg $cfg_attr:tt])*
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| 106 | $(#[doc $($doc_attr:tt)*])*
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| 107 | $variant:ident,
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| 108 | $($next:tt)*
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| 109 | }
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| 110 | ) => {
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| 111 | generate_to_tokens!(
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| 112 | ($($arms)* $(#[cfg $cfg_attr])* $name::$variant => {})
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| 113 | $tokens $name { $($next)* }
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| 114 | );
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| 115 | };
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| 116 |
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| 117 | (
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| 118 | ($($arms:tt)*) $tokens:ident $name:ident {
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| 119 | $(#[cfg $cfg_attr:tt])*
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| 120 | $(#[doc $($doc_attr:tt)*])*
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| 121 | $variant:ident($member:ident),
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| 122 | $($next:tt)*
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| 123 | }
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| 124 | ) => {
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| 125 | generate_to_tokens!(
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| 126 | ($($arms)* $(#[cfg $cfg_attr])* $name::$variant(_e) => _e.to_tokens($tokens),)
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| 127 | $tokens $name { $($next)* }
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| 128 | );
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| 129 | };
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| 130 |
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| 131 | (($($arms:tt)*) $tokens:ident $name:ident {}) => {
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| 132 | #[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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| 133 | impl ::quote::ToTokens for $name {
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| 134 | fn to_tokens(&self, $tokens: &mut ::proc_macro2::TokenStream) {
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| 135 | match self {
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| 136 | $($arms)*
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| 137 | }
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| 138 | }
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| 139 | }
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| 140 | };
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| 141 | }
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| 142 |
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| 143 | |
| 144 | #[cfg(all(doc, feature = "parsing"))]
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| 145 | macro_rules! pub_if_not_doc {
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| 146 | ($(#[$m:meta])* $pub:ident $($item:tt)*) => {
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| 147 | check_keyword_matches!(pub $pub);
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| 148 |
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| 149 | $(#[$m])*
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| 150 | $pub(crate) $($item)*
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| 151 | };
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| 152 | }
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| 153 |
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| 154 | #[cfg(all(not(doc), feature = "parsing"))]
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| 155 | macro_rules! pub_if_not_doc {
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| 156 | ($(#[$m:meta])* $pub:ident $($item:tt)*) => {
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| 157 | check_keyword_matches!(pub $pub);
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| 158 |
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| 159 | $(#[$m])*
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| 160 | $pub $($item)*
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| 161 | };
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| 162 | }
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| 163 |
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| 164 | macro_rules! check_keyword_matches {
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| 165 | (enum enum) => {};
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| 166 | (pub pub) => {};
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| 167 | (struct struct) => {};
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| 168 | }
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| 169 |
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| 170 | #[cfg(any(feature = "full", feature = "derive"))]
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| 171 | macro_rules! return_impl_trait {
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| 172 | (
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| 173 | $(#[$attr:meta])*
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| 174 | $vis:vis fn $name:ident $args:tt -> $impl_trait:ty [$concrete:ty] $body:block
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| 175 | ) => {
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| 176 | #[cfg(not(docsrs))]
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| 177 | $(#[$attr])*
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| 178 | $vis fn $name $args -> $concrete $body
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| 179 |
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| 180 | #[cfg(docsrs)]
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| 181 | $(#[$attr])*
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| 182 | $vis fn $name $args -> $impl_trait $body
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| 183 | };
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| 184 | }
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