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//! This modules handles hygiene information.
//!
//! Specifically, `ast` + `Hygiene` allows you to create a `Name`. Note that, at
//! this moment, this is horribly incomplete and handles only `$crate`.
// Should this be moved to `hir_expand`? Seems like it.
use hir_expand::{
db::AstDatabase,
either::Either,
name::{AsName, Name},
HirFileId,
};
use ra_db::CrateId;
use ra_syntax::ast;
#[derive(Debug)]
pub struct Hygiene {
// This is what `$crate` expands to
def_crate: Option<CrateId>,
}
impl Hygiene {
pub fn new(db: &impl AstDatabase, file_id: HirFileId) -> Hygiene {
Hygiene { def_crate: file_id.macro_crate(db) }
}
pub(crate) fn new_unhygienic() -> Hygiene {
Hygiene { def_crate: None }
}
// FIXME: this should just return name
pub(crate) fn name_ref_to_name(&self, name_ref: ast::NameRef) -> Either<Name, CrateId> {
if let Some(def_crate) = self.def_crate {
if name_ref.text() == "$crate" {
return Either::B(def_crate);
}
}
Either::A(name_ref.as_name())
}
}
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