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|
macro_rules! ast_struct {
(
[$($attrs_pub:tt)*]
struct $name:ident $($rest:tt)*
) => {
#[cfg_attr(feature = "clone-impls", derive(Clone))]
$($attrs_pub)* struct $name $($rest)*
};
($($t:tt)*) => {
strip_attrs_pub!(ast_struct!($($t)*));
};
}
macro_rules! ast_enum {
(
[$($attrs_pub:tt)*]
enum $name:ident $($rest:tt)*
) => (
#[cfg_attr(feature = "clone-impls", derive(Clone))]
$($attrs_pub)* enum $name $($rest)*
);
($($t:tt)*) => {
strip_attrs_pub!(ast_enum!($($t)*));
};
}
macro_rules! ast_enum_of_structs {
(
$(#[$enum_attr:meta])*
$pub:ident $enum:ident $name:ident $body:tt
) => {
ast_enum!($(#[$enum_attr])* $pub $enum $name $body);
ast_enum_of_structs_impl!($pub $enum $name $body);
};
}
macro_rules! ast_enum_of_structs_impl {
(
$pub:ident $enum:ident $name:ident {
$(
$(#[$variant_attr:meta])*
$variant:ident $( ($member:ident) )*,
)*
}
) => {
check_keyword_matches!(pub $pub);
check_keyword_matches!(enum $enum);
$(
$(
impl From<$member> for $name {
fn from(e: $member) -> $name {
$name::$variant(e)
}
}
)*
)*
generate_to_tokens! {
()
tokens
$name { $($variant $($member)*,)* }
}
};
}
macro_rules! generate_to_tokens {
(($($arms:tt)*) $tokens:ident $name:ident { $variant:ident, $($next:tt)*}) => {
generate_to_tokens!(
($($arms)* $name::$variant => {})
$tokens $name { $($next)* }
);
};
(($($arms:tt)*) $tokens:ident $name:ident { $variant:ident $member:ident, $($next:tt)*}) => {
generate_to_tokens!(
($($arms)* $name::$variant(_e) => quote::ToTokens::to_tokens(_e, $tokens),)
$tokens $name { $($next)* }
);
};
(($($arms:tt)*) $tokens:ident $name:ident {}) => {
impl quote::ToTokens for $name {
fn to_tokens(&self, $tokens: &mut proc_macro2::TokenStream) {
match self {
$($arms)*
}
}
}
};
}
macro_rules! strip_attrs_pub {
($mac:ident!($(#[$m:meta])* $pub:ident $($t:tt)*)) => {
check_keyword_matches!(pub $pub);
$mac!([$(#[$m])* $pub] $($t)*);
};
}
macro_rules! check_keyword_matches {
(struct struct) => {};
(enum enum) => {};
(pub pub) => {};
}
|
