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use crate::ty;
use rustc_hir::def::Res;
use rustc_macros::HashStable;
use rustc_span::def_id::DefId;
use rustc_span::symbol::Ident;
use rustc_span::Span;
use smallvec::SmallVec;
/// A simplified version of `ImportKind` from resolve.
/// `DefId`s here correspond to `use` and `extern crate` items themselves, not their targets.
#[derive(Clone, Copy, Debug, TyEncodable, TyDecodable, HashStable)]
pub enum Reexport {
Single(DefId),
Glob(DefId),
ExternCrate(DefId),
MacroUse,
MacroExport,
}
impl Reexport {
pub fn id(self) -> Option<DefId> {
match self {
Reexport::Single(id) | Reexport::Glob(id) | Reexport::ExternCrate(id) => Some(id),
Reexport::MacroUse | Reexport::MacroExport => None,
}
}
}
/// This structure is supposed to keep enough data to re-create `NameBinding`s for other crates
/// during name resolution. Right now the bindings are not recreated entirely precisely so we may
/// need to add more data in the future to correctly support macros 2.0, for example.
/// Module child can be either a proper item or a reexport (including private imports).
/// In case of reexport all the fields describe the reexport item itself, not what it refers to.
#[derive(Debug, TyEncodable, TyDecodable, HashStable)]
pub struct ModChild {
/// Name of the item.
pub ident: Ident,
/// Resolution result corresponding to the item.
/// Local variables cannot be exported, so this `Res` doesn't need the ID parameter.
pub res: Res<!>,
/// Visibility of the item.
pub vis: ty::Visibility<DefId>,
/// Span of the item.
pub span: Span,
/// Reexport chain linking this module child to its original reexported item.
/// Empty if the module child is a proper item.
pub reexport_chain: SmallVec<[Reexport; 2]>,
}
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