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//! Builtin derives.
use syntax::ast;
use crate::{db::AstDatabase, name, AstId, CrateId, MacroCallId, MacroDefId, MacroDefKind};
macro_rules! register_builtin {
( $(($name:ident, $variant:ident) => $expand:ident),* ) => {
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum BuiltinAttrExpander {
$($variant),*
}
impl BuiltinAttrExpander {
pub fn expand(
&self,
db: &dyn AstDatabase,
id: MacroCallId,
tt: &tt::Subtree,
) -> Result<tt::Subtree, mbe::ExpandError> {
let expander = match *self {
$( BuiltinAttrExpander::$variant => $expand, )*
};
expander(db, id, tt)
}
fn find_by_name(name: &name::Name) -> Option<Self> {
match name {
$( id if id == &name::name![$name] => Some(BuiltinAttrExpander::$variant), )*
_ => None,
}
}
}
};
}
register_builtin! {
(bench, Bench) => dummy_attr_expand,
(cfg_accessible, CfgAccessible) => dummy_attr_expand,
(cfg_eval, CfgEval) => dummy_attr_expand,
(derive, Derive) => dummy_attr_expand,
(global_allocator, GlobalAllocator) => dummy_attr_expand,
(test, Test) => dummy_attr_expand,
(test_case, TestCase) => dummy_attr_expand
}
pub fn find_builtin_attr(
ident: &name::Name,
krate: CrateId,
ast_id: AstId<ast::Macro>,
) -> Option<MacroDefId> {
let expander = BuiltinAttrExpander::find_by_name(ident)?;
Some(MacroDefId {
krate,
kind: MacroDefKind::BuiltInAttr(expander, ast_id),
local_inner: false,
})
}
fn dummy_attr_expand(
_db: &dyn AstDatabase,
_id: MacroCallId,
tt: &tt::Subtree,
) -> Result<tt::Subtree, mbe::ExpandError> {
Ok(tt.clone())
}
|
