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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/librustdoc/clean/inline.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/librustdoc/clean/inline.rs')
-rw-r--r-- | src/librustdoc/clean/inline.rs | 727 |
1 files changed, 727 insertions, 0 deletions
diff --git a/src/librustdoc/clean/inline.rs b/src/librustdoc/clean/inline.rs new file mode 100644 index 000000000..58d0aedb0 --- /dev/null +++ b/src/librustdoc/clean/inline.rs @@ -0,0 +1,727 @@ +//! Support for inlining external documentation into the current AST. + +use std::iter::once; +use std::sync::Arc; + +use rustc_ast as ast; +use rustc_data_structures::fx::FxHashSet; +use rustc_data_structures::thin_vec::ThinVec; +use rustc_hir as hir; +use rustc_hir::def::{DefKind, Res}; +use rustc_hir::def_id::DefId; +use rustc_hir::Mutability; +use rustc_metadata::creader::{CStore, LoadedMacro}; +use rustc_middle::ty::{self, TyCtxt}; +use rustc_span::hygiene::MacroKind; +use rustc_span::symbol::{kw, sym, Symbol}; + +use crate::clean::{ + self, clean_fn_decl_from_did_and_sig, clean_middle_field, clean_middle_ty, + clean_trait_ref_with_bindings, clean_ty, clean_ty_generics, clean_variant_def, + clean_visibility, utils, Attributes, AttributesExt, Clean, ImplKind, ItemId, Type, Visibility, +}; +use crate::core::DocContext; +use crate::formats::item_type::ItemType; + +type Attrs<'hir> = &'hir [ast::Attribute]; + +/// Attempt to inline a definition into this AST. +/// +/// This function will fetch the definition specified, and if it is +/// from another crate it will attempt to inline the documentation +/// from the other crate into this crate. +/// +/// This is primarily used for `pub use` statements which are, in general, +/// implementation details. Inlining the documentation should help provide a +/// better experience when reading the documentation in this use case. +/// +/// The returned value is `None` if the definition could not be inlined, +/// and `Some` of a vector of items if it was successfully expanded. +/// +/// `parent_module` refers to the parent of the *re-export*, not the original item. +pub(crate) fn try_inline( + cx: &mut DocContext<'_>, + parent_module: DefId, + import_def_id: Option<DefId>, + res: Res, + name: Symbol, + attrs: Option<Attrs<'_>>, + visited: &mut FxHashSet<DefId>, +) -> Option<Vec<clean::Item>> { + let did = res.opt_def_id()?; + if did.is_local() { + return None; + } + let mut ret = Vec::new(); + + debug!("attrs={:?}", attrs); + let attrs_clone = attrs; + + let kind = match res { + Res::Def(DefKind::Trait, did) => { + record_extern_fqn(cx, did, ItemType::Trait); + build_impls(cx, Some(parent_module), did, attrs, &mut ret); + clean::TraitItem(build_external_trait(cx, did)) + } + Res::Def(DefKind::Fn, did) => { + record_extern_fqn(cx, did, ItemType::Function); + clean::FunctionItem(build_external_function(cx, did)) + } + Res::Def(DefKind::Struct, did) => { + record_extern_fqn(cx, did, ItemType::Struct); + build_impls(cx, Some(parent_module), did, attrs, &mut ret); + clean::StructItem(build_struct(cx, did)) + } + Res::Def(DefKind::Union, did) => { + record_extern_fqn(cx, did, ItemType::Union); + build_impls(cx, Some(parent_module), did, attrs, &mut ret); + clean::UnionItem(build_union(cx, did)) + } + Res::Def(DefKind::TyAlias, did) => { + record_extern_fqn(cx, did, ItemType::Typedef); + build_impls(cx, Some(parent_module), did, attrs, &mut ret); + clean::TypedefItem(build_type_alias(cx, did)) + } + Res::Def(DefKind::Enum, did) => { + record_extern_fqn(cx, did, ItemType::Enum); + build_impls(cx, Some(parent_module), did, attrs, &mut ret); + clean::EnumItem(build_enum(cx, did)) + } + Res::Def(DefKind::ForeignTy, did) => { + record_extern_fqn(cx, did, ItemType::ForeignType); + build_impls(cx, Some(parent_module), did, attrs, &mut ret); + clean::ForeignTypeItem + } + // Never inline enum variants but leave them shown as re-exports. + Res::Def(DefKind::Variant, _) => return None, + // Assume that enum variants and struct types are re-exported next to + // their constructors. + Res::Def(DefKind::Ctor(..), _) | Res::SelfCtor(..) => return Some(Vec::new()), + Res::Def(DefKind::Mod, did) => { + record_extern_fqn(cx, did, ItemType::Module); + clean::ModuleItem(build_module(cx, did, visited)) + } + Res::Def(DefKind::Static(_), did) => { + record_extern_fqn(cx, did, ItemType::Static); + clean::StaticItem(build_static(cx, did, cx.tcx.is_mutable_static(did))) + } + Res::Def(DefKind::Const, did) => { + record_extern_fqn(cx, did, ItemType::Constant); + clean::ConstantItem(build_const(cx, did)) + } + Res::Def(DefKind::Macro(kind), did) => { + let mac = build_macro(cx, did, name, import_def_id); + + let type_kind = match kind { + MacroKind::Bang => ItemType::Macro, + MacroKind::Attr => ItemType::ProcAttribute, + MacroKind::Derive => ItemType::ProcDerive, + }; + record_extern_fqn(cx, did, type_kind); + mac + } + _ => return None, + }; + + let (attrs, cfg) = merge_attrs(cx, Some(parent_module), load_attrs(cx, did), attrs_clone); + cx.inlined.insert(did.into()); + let mut item = clean::Item::from_def_id_and_attrs_and_parts( + did, + Some(name), + kind, + Box::new(attrs), + cx, + cfg, + ); + if let Some(import_def_id) = import_def_id { + // The visibility needs to reflect the one from the reexport and not from the "source" DefId. + item.visibility = clean_visibility(cx.tcx.visibility(import_def_id)); + } + ret.push(item); + Some(ret) +} + +pub(crate) fn try_inline_glob( + cx: &mut DocContext<'_>, + res: Res, + visited: &mut FxHashSet<DefId>, + inlined_names: &mut FxHashSet<(ItemType, Symbol)>, +) -> Option<Vec<clean::Item>> { + let did = res.opt_def_id()?; + if did.is_local() { + return None; + } + + match res { + Res::Def(DefKind::Mod, did) => { + let mut items = build_module_items(cx, did, visited, inlined_names); + items.drain_filter(|item| { + if let Some(name) = item.name { + // If an item with the same type and name already exists, + // it takes priority over the inlined stuff. + !inlined_names.insert((item.type_(), name)) + } else { + false + } + }); + Some(items) + } + // glob imports on things like enums aren't inlined even for local exports, so just bail + _ => None, + } +} + +pub(crate) fn load_attrs<'hir>(cx: &DocContext<'hir>, did: DefId) -> Attrs<'hir> { + cx.tcx.get_attrs_unchecked(did) +} + +/// Record an external fully qualified name in the external_paths cache. +/// +/// These names are used later on by HTML rendering to generate things like +/// source links back to the original item. +pub(crate) fn record_extern_fqn(cx: &mut DocContext<'_>, did: DefId, kind: ItemType) { + let crate_name = cx.tcx.crate_name(did.krate); + + let relative = + cx.tcx.def_path(did).data.into_iter().filter_map(|elem| elem.data.get_opt_name()); + let fqn = if let ItemType::Macro = kind { + // Check to see if it is a macro 2.0 or built-in macro + if matches!( + CStore::from_tcx(cx.tcx).load_macro_untracked(did, cx.sess()), + LoadedMacro::MacroDef(def, _) + if matches!(&def.kind, ast::ItemKind::MacroDef(ast_def) + if !ast_def.macro_rules) + ) { + once(crate_name).chain(relative).collect() + } else { + vec![crate_name, relative.last().expect("relative was empty")] + } + } else { + once(crate_name).chain(relative).collect() + }; + + if did.is_local() { + cx.cache.exact_paths.insert(did, fqn); + } else { + cx.cache.external_paths.insert(did, (fqn, kind)); + } +} + +pub(crate) fn build_external_trait(cx: &mut DocContext<'_>, did: DefId) -> clean::Trait { + let trait_items = cx + .tcx + .associated_items(did) + .in_definition_order() + .map(|item| { + // When building an external trait, the cleaned trait will have all items public, + // which causes methods to have a `pub` prefix, which is invalid since items in traits + // can not have a visibility prefix. Thus we override the visibility here manually. + // See https://github.com/rust-lang/rust/issues/81274 + clean::Item { visibility: Visibility::Inherited, ..item.clean(cx) } + }) + .collect(); + + let predicates = cx.tcx.predicates_of(did); + let generics = clean_ty_generics(cx, cx.tcx.generics_of(did), predicates); + let generics = filter_non_trait_generics(did, generics); + let (generics, supertrait_bounds) = separate_supertrait_bounds(generics); + clean::Trait { def_id: did, generics, items: trait_items, bounds: supertrait_bounds } +} + +fn build_external_function<'tcx>(cx: &mut DocContext<'tcx>, did: DefId) -> Box<clean::Function> { + let sig = cx.tcx.fn_sig(did); + + let predicates = cx.tcx.predicates_of(did); + let (generics, decl) = clean::enter_impl_trait(cx, |cx| { + // NOTE: generics need to be cleaned before the decl! + let generics = clean_ty_generics(cx, cx.tcx.generics_of(did), predicates); + let decl = clean_fn_decl_from_did_and_sig(cx, Some(did), sig); + (generics, decl) + }); + Box::new(clean::Function { decl, generics }) +} + +fn build_enum(cx: &mut DocContext<'_>, did: DefId) -> clean::Enum { + let predicates = cx.tcx.explicit_predicates_of(did); + + clean::Enum { + generics: clean_ty_generics(cx, cx.tcx.generics_of(did), predicates), + variants: cx.tcx.adt_def(did).variants().iter().map(|v| clean_variant_def(v, cx)).collect(), + } +} + +fn build_struct(cx: &mut DocContext<'_>, did: DefId) -> clean::Struct { + let predicates = cx.tcx.explicit_predicates_of(did); + let variant = cx.tcx.adt_def(did).non_enum_variant(); + + clean::Struct { + struct_type: variant.ctor_kind, + generics: clean_ty_generics(cx, cx.tcx.generics_of(did), predicates), + fields: variant.fields.iter().map(|x| clean_middle_field(x, cx)).collect(), + } +} + +fn build_union(cx: &mut DocContext<'_>, did: DefId) -> clean::Union { + let predicates = cx.tcx.explicit_predicates_of(did); + let variant = cx.tcx.adt_def(did).non_enum_variant(); + + let generics = clean_ty_generics(cx, cx.tcx.generics_of(did), predicates); + let fields = variant.fields.iter().map(|x| clean_middle_field(x, cx)).collect(); + clean::Union { generics, fields } +} + +fn build_type_alias(cx: &mut DocContext<'_>, did: DefId) -> Box<clean::Typedef> { + let predicates = cx.tcx.explicit_predicates_of(did); + let type_ = clean_middle_ty(cx.tcx.type_of(did), cx, Some(did)); + + Box::new(clean::Typedef { + type_, + generics: clean_ty_generics(cx, cx.tcx.generics_of(did), predicates), + item_type: None, + }) +} + +/// Builds all inherent implementations of an ADT (struct/union/enum) or Trait item/path/reexport. +pub(crate) fn build_impls( + cx: &mut DocContext<'_>, + parent_module: Option<DefId>, + did: DefId, + attrs: Option<Attrs<'_>>, + ret: &mut Vec<clean::Item>, +) { + let _prof_timer = cx.tcx.sess.prof.generic_activity("build_inherent_impls"); + let tcx = cx.tcx; + + // for each implementation of an item represented by `did`, build the clean::Item for that impl + for &did in tcx.inherent_impls(did).iter() { + build_impl(cx, parent_module, did, attrs, ret); + } +} + +/// `parent_module` refers to the parent of the re-export, not the original item +fn merge_attrs( + cx: &mut DocContext<'_>, + parent_module: Option<DefId>, + old_attrs: Attrs<'_>, + new_attrs: Option<Attrs<'_>>, +) -> (clean::Attributes, Option<Arc<clean::cfg::Cfg>>) { + // NOTE: If we have additional attributes (from a re-export), + // always insert them first. This ensure that re-export + // doc comments show up before the original doc comments + // when we render them. + if let Some(inner) = new_attrs { + let mut both = inner.to_vec(); + both.extend_from_slice(old_attrs); + ( + if let Some(new_id) = parent_module { + Attributes::from_ast_with_additional(old_attrs, (inner, new_id)) + } else { + Attributes::from_ast(&both) + }, + both.cfg(cx.tcx, &cx.cache.hidden_cfg), + ) + } else { + (Attributes::from_ast(&old_attrs), old_attrs.cfg(cx.tcx, &cx.cache.hidden_cfg)) + } +} + +/// Inline an `impl`, inherent or of a trait. The `did` must be for an `impl`. +pub(crate) fn build_impl( + cx: &mut DocContext<'_>, + parent_module: Option<DefId>, + did: DefId, + attrs: Option<Attrs<'_>>, + ret: &mut Vec<clean::Item>, +) { + if !cx.inlined.insert(did.into()) { + return; + } + + let _prof_timer = cx.tcx.sess.prof.generic_activity("build_impl"); + + let tcx = cx.tcx; + let associated_trait = tcx.impl_trait_ref(did); + + // Only inline impl if the implemented trait is + // reachable in rustdoc generated documentation + if !did.is_local() { + if let Some(traitref) = associated_trait { + let did = traitref.def_id; + if !cx.cache.access_levels.is_public(did) { + return; + } + + if let Some(stab) = tcx.lookup_stability(did) { + if stab.is_unstable() && stab.feature == sym::rustc_private { + return; + } + } + } + } + + let impl_item = match did.as_local() { + Some(did) => match &tcx.hir().expect_item(did).kind { + hir::ItemKind::Impl(impl_) => Some(impl_), + _ => panic!("`DefID` passed to `build_impl` is not an `impl"), + }, + None => None, + }; + + let for_ = match &impl_item { + Some(impl_) => clean_ty(impl_.self_ty, cx), + None => clean_middle_ty(tcx.type_of(did), cx, Some(did)), + }; + + // Only inline impl if the implementing type is + // reachable in rustdoc generated documentation + if !did.is_local() { + if let Some(did) = for_.def_id(&cx.cache) { + if !cx.cache.access_levels.is_public(did) { + return; + } + + if let Some(stab) = tcx.lookup_stability(did) { + if stab.is_unstable() && stab.feature == sym::rustc_private { + return; + } + } + } + } + + let document_hidden = cx.render_options.document_hidden; + let predicates = tcx.explicit_predicates_of(did); + let (trait_items, generics) = match impl_item { + Some(impl_) => ( + impl_ + .items + .iter() + .map(|item| tcx.hir().impl_item(item.id)) + .filter(|item| { + // Filter out impl items whose corresponding trait item has `doc(hidden)` + // not to document such impl items. + // For inherent impls, we don't do any filtering, because that's already done in strip_hidden.rs. + + // When `--document-hidden-items` is passed, we don't + // do any filtering, too. + if document_hidden { + return true; + } + if let Some(associated_trait) = associated_trait { + let assoc_kind = match item.kind { + hir::ImplItemKind::Const(..) => ty::AssocKind::Const, + hir::ImplItemKind::Fn(..) => ty::AssocKind::Fn, + hir::ImplItemKind::TyAlias(..) => ty::AssocKind::Type, + }; + let trait_item = tcx + .associated_items(associated_trait.def_id) + .find_by_name_and_kind( + tcx, + item.ident, + assoc_kind, + associated_trait.def_id, + ) + .unwrap(); // SAFETY: For all impl items there exists trait item that has the same name. + !tcx.is_doc_hidden(trait_item.def_id) + } else { + true + } + }) + .map(|item| item.clean(cx)) + .collect::<Vec<_>>(), + impl_.generics.clean(cx), + ), + None => ( + tcx.associated_items(did) + .in_definition_order() + .filter(|item| { + // If this is a trait impl, filter out associated items whose corresponding item + // in the associated trait is marked `doc(hidden)`. + // If this is an inherent impl, filter out private associated items. + if let Some(associated_trait) = associated_trait { + let trait_item = tcx + .associated_items(associated_trait.def_id) + .find_by_name_and_kind( + tcx, + item.ident(tcx), + item.kind, + associated_trait.def_id, + ) + .unwrap(); // corresponding associated item has to exist + !tcx.is_doc_hidden(trait_item.def_id) + } else { + item.visibility(tcx).is_public() + } + }) + .map(|item| item.clean(cx)) + .collect::<Vec<_>>(), + clean::enter_impl_trait(cx, |cx| { + clean_ty_generics(cx, tcx.generics_of(did), predicates) + }), + ), + }; + let polarity = tcx.impl_polarity(did); + let trait_ = associated_trait.map(|t| clean_trait_ref_with_bindings(cx, t, &[])); + if trait_.as_ref().map(|t| t.def_id()) == tcx.lang_items().deref_trait() { + super::build_deref_target_impls(cx, &trait_items, ret); + } + + // Return if the trait itself or any types of the generic parameters are doc(hidden). + let mut stack: Vec<&Type> = vec![&for_]; + + if let Some(did) = trait_.as_ref().map(|t| t.def_id()) { + if tcx.is_doc_hidden(did) { + return; + } + } + if let Some(generics) = trait_.as_ref().and_then(|t| t.generics()) { + stack.extend(generics); + } + + while let Some(ty) = stack.pop() { + if let Some(did) = ty.def_id(&cx.cache) { + if tcx.is_doc_hidden(did) { + return; + } + } + if let Some(generics) = ty.generics() { + stack.extend(generics); + } + } + + if let Some(did) = trait_.as_ref().map(|t| t.def_id()) { + record_extern_trait(cx, did); + } + + let (merged_attrs, cfg) = merge_attrs(cx, parent_module, load_attrs(cx, did), attrs); + trace!("merged_attrs={:?}", merged_attrs); + + trace!( + "build_impl: impl {:?} for {:?}", + trait_.as_ref().map(|t| t.def_id()), + for_.def_id(&cx.cache) + ); + ret.push(clean::Item::from_def_id_and_attrs_and_parts( + did, + None, + clean::ImplItem(Box::new(clean::Impl { + unsafety: hir::Unsafety::Normal, + generics, + trait_, + for_, + items: trait_items, + polarity, + kind: if utils::has_doc_flag(tcx, did, sym::fake_variadic) { + ImplKind::FakeVaradic + } else { + ImplKind::Normal + }, + })), + Box::new(merged_attrs), + cx, + cfg, + )); +} + +fn build_module( + cx: &mut DocContext<'_>, + did: DefId, + visited: &mut FxHashSet<DefId>, +) -> clean::Module { + let items = build_module_items(cx, did, visited, &mut FxHashSet::default()); + + let span = clean::Span::new(cx.tcx.def_span(did)); + clean::Module { items, span } +} + +fn build_module_items( + cx: &mut DocContext<'_>, + did: DefId, + visited: &mut FxHashSet<DefId>, + inlined_names: &mut FxHashSet<(ItemType, Symbol)>, +) -> Vec<clean::Item> { + let mut items = Vec::new(); + + // If we're re-exporting a re-export it may actually re-export something in + // two namespaces, so the target may be listed twice. Make sure we only + // visit each node at most once. + for &item in cx.tcx.module_children(did).iter() { + if item.vis.is_public() { + let res = item.res.expect_non_local(); + if let Some(def_id) = res.mod_def_id() { + // If we're inlining a glob import, it's possible to have + // two distinct modules with the same name. We don't want to + // inline it, or mark any of its contents as visited. + if did == def_id + || inlined_names.contains(&(ItemType::Module, item.ident.name)) + || !visited.insert(def_id) + { + continue; + } + } + if let Res::PrimTy(p) = res { + // Primitive types can't be inlined so generate an import instead. + let prim_ty = clean::PrimitiveType::from(p); + items.push(clean::Item { + name: None, + attrs: Box::new(clean::Attributes::default()), + item_id: ItemId::Primitive(prim_ty, did.krate), + visibility: clean::Public, + kind: Box::new(clean::ImportItem(clean::Import::new_simple( + item.ident.name, + clean::ImportSource { + path: clean::Path { + res, + segments: vec![clean::PathSegment { + name: prim_ty.as_sym(), + args: clean::GenericArgs::AngleBracketed { + args: Default::default(), + bindings: ThinVec::new(), + }, + }], + }, + did: None, + }, + true, + ))), + cfg: None, + }); + } else if let Some(i) = try_inline(cx, did, None, res, item.ident.name, None, visited) { + items.extend(i) + } + } + } + + items +} + +pub(crate) fn print_inlined_const(tcx: TyCtxt<'_>, did: DefId) -> String { + if let Some(did) = did.as_local() { + let hir_id = tcx.hir().local_def_id_to_hir_id(did); + rustc_hir_pretty::id_to_string(&tcx.hir(), hir_id) + } else { + tcx.rendered_const(did).clone() + } +} + +fn build_const(cx: &mut DocContext<'_>, def_id: DefId) -> clean::Constant { + clean::Constant { + type_: clean_middle_ty(cx.tcx.type_of(def_id), cx, Some(def_id)), + kind: clean::ConstantKind::Extern { def_id }, + } +} + +fn build_static(cx: &mut DocContext<'_>, did: DefId, mutable: bool) -> clean::Static { + clean::Static { + type_: clean_middle_ty(cx.tcx.type_of(did), cx, Some(did)), + mutability: if mutable { Mutability::Mut } else { Mutability::Not }, + expr: None, + } +} + +fn build_macro( + cx: &mut DocContext<'_>, + def_id: DefId, + name: Symbol, + import_def_id: Option<DefId>, +) -> clean::ItemKind { + match CStore::from_tcx(cx.tcx).load_macro_untracked(def_id, cx.sess()) { + LoadedMacro::MacroDef(item_def, _) => { + if let ast::ItemKind::MacroDef(ref def) = item_def.kind { + let vis = clean_visibility(cx.tcx.visibility(import_def_id.unwrap_or(def_id))); + clean::MacroItem(clean::Macro { + source: utils::display_macro_source(cx, name, def, def_id, vis), + }) + } else { + unreachable!() + } + } + LoadedMacro::ProcMacro(ext) => clean::ProcMacroItem(clean::ProcMacro { + kind: ext.macro_kind(), + helpers: ext.helper_attrs, + }), + } +} + +/// A trait's generics clause actually contains all of the predicates for all of +/// its associated types as well. We specifically move these clauses to the +/// associated types instead when displaying, so when we're generating the +/// generics for the trait itself we need to be sure to remove them. +/// We also need to remove the implied "recursive" Self: Trait bound. +/// +/// The inverse of this filtering logic can be found in the `Clean` +/// implementation for `AssociatedType` +fn filter_non_trait_generics(trait_did: DefId, mut g: clean::Generics) -> clean::Generics { + for pred in &mut g.where_predicates { + match *pred { + clean::WherePredicate::BoundPredicate { + ty: clean::Generic(ref s), + ref mut bounds, + .. + } if *s == kw::SelfUpper => { + bounds.retain(|bound| match bound { + clean::GenericBound::TraitBound(clean::PolyTrait { trait_, .. }, _) => { + trait_.def_id() != trait_did + } + _ => true, + }); + } + _ => {} + } + } + + g.where_predicates.retain(|pred| match pred { + clean::WherePredicate::BoundPredicate { + ty: clean::QPath { self_type: box clean::Generic(ref s), trait_, .. }, + bounds, + .. + } => !(bounds.is_empty() || *s == kw::SelfUpper && trait_.def_id() == trait_did), + _ => true, + }); + g +} + +/// Supertrait bounds for a trait are also listed in the generics coming from +/// the metadata for a crate, so we want to separate those out and create a new +/// list of explicit supertrait bounds to render nicely. +fn separate_supertrait_bounds( + mut g: clean::Generics, +) -> (clean::Generics, Vec<clean::GenericBound>) { + let mut ty_bounds = Vec::new(); + g.where_predicates.retain(|pred| match *pred { + clean::WherePredicate::BoundPredicate { ty: clean::Generic(ref s), ref bounds, .. } + if *s == kw::SelfUpper => + { + ty_bounds.extend(bounds.iter().cloned()); + false + } + _ => true, + }); + (g, ty_bounds) +} + +pub(crate) fn record_extern_trait(cx: &mut DocContext<'_>, did: DefId) { + if did.is_local() { + return; + } + + { + if cx.external_traits.borrow().contains_key(&did) || cx.active_extern_traits.contains(&did) + { + return; + } + } + + { + cx.active_extern_traits.insert(did); + } + + debug!("record_extern_trait: {:?}", did); + let trait_ = build_external_trait(cx, did); + + let trait_ = clean::TraitWithExtraInfo { + trait_, + is_notable: clean::utils::has_doc_flag(cx.tcx, did, sym::notable_trait), + }; + cx.external_traits.borrow_mut().insert(did, trait_); + cx.active_extern_traits.remove(&did); +} |