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//! Builtin derives.
use crate::db::AstDatabase;
use crate::{name, MacroCallId, MacroDefId, MacroDefKind};
use crate::quote;
macro_rules! register_builtin {
( $(($name:ident, $kind: ident) => $expand:ident),* ) => {
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum BuiltinDeriveExpander {
$($kind),*
}
impl BuiltinDeriveExpander {
pub fn expand(
&self,
db: &dyn AstDatabase,
id: MacroCallId,
tt: &tt::Subtree,
) -> Result<tt::Subtree, mbe::ExpandError> {
let expander = match *self {
$( BuiltinDeriveExpander::$kind => $expand, )*
};
expander(db, id, tt)
}
}
pub fn find_builtin_derive(ident: &name::Name) -> Option<MacroDefId> {
let kind = match ident {
$( id if id == &name::$name => BuiltinDeriveExpander::$kind, )*
_ => return None,
};
Some(MacroDefId { krate: None, ast_id: None, kind: MacroDefKind::BuiltInDerive(kind) })
}
};
}
register_builtin! {
(COPY_TRAIT, Copy) => copy_expand,
(CLONE_TRAIT, Clone) => clone_expand
}
fn copy_expand(
_db: &dyn AstDatabase,
_id: MacroCallId,
_tt: &tt::Subtree,
) -> Result<tt::Subtree, mbe::ExpandError> {
let expanded = quote! {
impl Copy for Foo {}
};
Ok(expanded)
}
fn clone_expand(
_db: &dyn AstDatabase,
_id: MacroCallId,
_tt: &tt::Subtree,
) -> Result<tt::Subtree, mbe::ExpandError> {
let expanded = quote! {
impl Clone for Foo {}
};
Ok(expanded)
}
|
