2374 lines
93 KiB
Rust
2374 lines
93 KiB
Rust
//! This module implements [RFC 1946]: Intra-rustdoc-links
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//!
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//! [RFC 1946]: https://github.com/rust-lang/rfcs/blob/master/text/1946-intra-rustdoc-links.md
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use std::borrow::Cow;
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use std::fmt::Display;
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use std::mem;
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use std::ops::Range;
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use pulldown_cmark::LinkType;
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use rustc_ast::util::comments::may_have_doc_links;
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use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet};
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use rustc_data_structures::intern::Interned;
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use rustc_errors::{Applicability, Diag, DiagMessage};
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use rustc_hir::def::Namespace::*;
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use rustc_hir::def::{DefKind, Namespace, PerNS};
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use rustc_hir::def_id::{CRATE_DEF_ID, DefId, LOCAL_CRATE};
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use rustc_hir::{Mutability, Safety};
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use rustc_middle::ty::{Ty, TyCtxt};
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use rustc_middle::{bug, span_bug, ty};
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use rustc_resolve::rustdoc::{
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MalformedGenerics, has_primitive_or_keyword_docs, prepare_to_doc_link_resolution,
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source_span_for_markdown_range, strip_generics_from_path,
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};
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use rustc_session::lint::Lint;
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use rustc_span::BytePos;
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use rustc_span::hygiene::MacroKind;
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use rustc_span::symbol::{Ident, Symbol, sym};
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use smallvec::{SmallVec, smallvec};
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use tracing::{debug, info, instrument, trace};
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use crate::clean::utils::find_nearest_parent_module;
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use crate::clean::{self, Crate, Item, ItemId, ItemLink, PrimitiveType};
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use crate::core::DocContext;
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use crate::html::markdown::{MarkdownLink, MarkdownLinkRange, markdown_links};
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use crate::lint::{BROKEN_INTRA_DOC_LINKS, PRIVATE_INTRA_DOC_LINKS};
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use crate::passes::Pass;
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use crate::visit::DocVisitor;
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pub(crate) const COLLECT_INTRA_DOC_LINKS: Pass =
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Pass { name: "collect-intra-doc-links", run: None, description: "resolves intra-doc links" };
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pub(crate) fn collect_intra_doc_links<'a, 'tcx>(
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krate: Crate,
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cx: &'a mut DocContext<'tcx>,
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) -> (Crate, LinkCollector<'a, 'tcx>) {
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let mut collector = LinkCollector {
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cx,
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visited_links: FxHashMap::default(),
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ambiguous_links: FxIndexMap::default(),
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};
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collector.visit_crate(&krate);
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(krate, collector)
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}
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fn filter_assoc_items_by_name_and_namespace(
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tcx: TyCtxt<'_>,
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assoc_items_of: DefId,
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ident: Ident,
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ns: Namespace,
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) -> impl Iterator<Item = &ty::AssocItem> + '_ {
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tcx.associated_items(assoc_items_of).filter_by_name_unhygienic(ident.name).filter(move |item| {
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item.kind.namespace() == ns && tcx.hygienic_eq(ident, item.ident(tcx), assoc_items_of)
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})
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}
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#[derive(Copy, Clone, Debug, Hash, PartialEq)]
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pub(crate) enum Res {
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Def(DefKind, DefId),
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Primitive(PrimitiveType),
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}
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type ResolveRes = rustc_hir::def::Res<rustc_ast::NodeId>;
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impl Res {
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fn descr(self) -> &'static str {
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match self {
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Res::Def(kind, id) => ResolveRes::Def(kind, id).descr(),
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Res::Primitive(_) => "primitive type",
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}
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}
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fn article(self) -> &'static str {
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match self {
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Res::Def(kind, id) => ResolveRes::Def(kind, id).article(),
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Res::Primitive(_) => "a",
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}
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}
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fn name(self, tcx: TyCtxt<'_>) -> Symbol {
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match self {
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Res::Def(_, id) => tcx.item_name(id),
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Res::Primitive(prim) => prim.as_sym(),
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}
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}
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fn def_id(self, tcx: TyCtxt<'_>) -> Option<DefId> {
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match self {
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Res::Def(_, id) => Some(id),
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Res::Primitive(prim) => PrimitiveType::primitive_locations(tcx).get(&prim).copied(),
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}
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}
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fn from_def_id(tcx: TyCtxt<'_>, def_id: DefId) -> Res {
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Res::Def(tcx.def_kind(def_id), def_id)
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}
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/// Used for error reporting.
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fn disambiguator_suggestion(self) -> Suggestion {
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let kind = match self {
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Res::Primitive(_) => return Suggestion::Prefix("prim"),
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Res::Def(kind, _) => kind,
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};
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let prefix = match kind {
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DefKind::Fn | DefKind::AssocFn => return Suggestion::Function,
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DefKind::Macro(MacroKind::Bang) => return Suggestion::Macro,
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DefKind::Macro(MacroKind::Derive) => "derive",
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DefKind::Struct => "struct",
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DefKind::Enum => "enum",
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DefKind::Trait => "trait",
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DefKind::Union => "union",
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DefKind::Mod => "mod",
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DefKind::Const | DefKind::ConstParam | DefKind::AssocConst | DefKind::AnonConst => {
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"const"
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}
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DefKind::Static { .. } => "static",
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DefKind::Field => "field",
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DefKind::Variant | DefKind::Ctor(..) => "variant",
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// Now handle things that don't have a specific disambiguator
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_ => match kind
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.ns()
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.expect("tried to calculate a disambiguator for a def without a namespace?")
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{
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Namespace::TypeNS => "type",
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Namespace::ValueNS => "value",
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Namespace::MacroNS => "macro",
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},
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};
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Suggestion::Prefix(prefix)
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}
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}
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impl TryFrom<ResolveRes> for Res {
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type Error = ();
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fn try_from(res: ResolveRes) -> Result<Self, ()> {
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use rustc_hir::def::Res::*;
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match res {
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Def(kind, id) => Ok(Res::Def(kind, id)),
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PrimTy(prim) => Ok(Res::Primitive(PrimitiveType::from_hir(prim))),
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// e.g. `#[derive]`
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ToolMod | NonMacroAttr(..) | Err => Result::Err(()),
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other => bug!("unrecognized res {other:?}"),
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}
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}
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}
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/// The link failed to resolve. [`resolution_failure`] should look to see if there's
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/// a more helpful error that can be given.
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#[derive(Debug)]
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struct UnresolvedPath<'a> {
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/// Item on which the link is resolved, used for resolving `Self`.
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item_id: DefId,
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/// The scope the link was resolved in.
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module_id: DefId,
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/// If part of the link resolved, this has the `Res`.
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///
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/// In `[std::io::Error::x]`, `std::io::Error` would be a partial resolution.
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partial_res: Option<Res>,
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/// The remaining unresolved path segments.
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///
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/// In `[std::io::Error::x]`, `x` would be unresolved.
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unresolved: Cow<'a, str>,
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}
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#[derive(Debug)]
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enum ResolutionFailure<'a> {
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/// This resolved, but with the wrong namespace.
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WrongNamespace {
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/// What the link resolved to.
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res: Res,
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/// The expected namespace for the resolution, determined from the link's disambiguator.
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///
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/// E.g., for `[fn@Result]` this is [`Namespace::ValueNS`],
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/// even though `Result`'s actual namespace is [`Namespace::TypeNS`].
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expected_ns: Namespace,
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},
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NotResolved(UnresolvedPath<'a>),
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}
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#[derive(Clone, Debug, Hash, PartialEq, Eq)]
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pub(crate) enum UrlFragment {
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Item(DefId),
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/// A part of a page that isn't a rust item.
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///
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/// Eg: `[Vector Examples](std::vec::Vec#examples)`
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UserWritten(String),
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}
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impl UrlFragment {
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/// Render the fragment, including the leading `#`.
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pub(crate) fn render(&self, s: &mut String, tcx: TyCtxt<'_>) {
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s.push('#');
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match self {
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&UrlFragment::Item(def_id) => {
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let kind = match tcx.def_kind(def_id) {
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DefKind::AssocFn => {
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if tcx.defaultness(def_id).has_value() {
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"method."
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} else {
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"tymethod."
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}
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}
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DefKind::AssocConst => "associatedconstant.",
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DefKind::AssocTy => "associatedtype.",
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DefKind::Variant => "variant.",
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DefKind::Field => {
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let parent_id = tcx.parent(def_id);
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if tcx.def_kind(parent_id) == DefKind::Variant {
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s.push_str("variant.");
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s.push_str(tcx.item_name(parent_id).as_str());
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".field."
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} else {
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"structfield."
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}
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}
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kind => bug!("unexpected associated item kind: {kind:?}"),
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};
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s.push_str(kind);
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s.push_str(tcx.item_name(def_id).as_str());
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}
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UrlFragment::UserWritten(raw) => s.push_str(raw),
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}
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}
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}
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#[derive(Clone, Debug, Hash, PartialEq, Eq)]
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pub(crate) struct ResolutionInfo {
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item_id: DefId,
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module_id: DefId,
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dis: Option<Disambiguator>,
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path_str: Box<str>,
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extra_fragment: Option<String>,
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}
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#[derive(Clone)]
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pub(crate) struct DiagnosticInfo<'a> {
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item: &'a Item,
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dox: &'a str,
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ori_link: &'a str,
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link_range: MarkdownLinkRange,
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}
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pub(crate) struct OwnedDiagnosticInfo {
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item: Item,
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dox: String,
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ori_link: String,
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link_range: MarkdownLinkRange,
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}
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impl From<DiagnosticInfo<'_>> for OwnedDiagnosticInfo {
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fn from(f: DiagnosticInfo<'_>) -> Self {
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Self {
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item: f.item.clone(),
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dox: f.dox.to_string(),
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ori_link: f.ori_link.to_string(),
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link_range: f.link_range.clone(),
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}
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}
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}
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impl OwnedDiagnosticInfo {
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pub(crate) fn into_info(&self) -> DiagnosticInfo<'_> {
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DiagnosticInfo {
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item: &self.item,
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ori_link: &self.ori_link,
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dox: &self.dox,
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link_range: self.link_range.clone(),
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}
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}
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}
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pub(crate) struct LinkCollector<'a, 'tcx> {
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pub(crate) cx: &'a mut DocContext<'tcx>,
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/// Cache the resolved links so we can avoid resolving (and emitting errors for) the same link.
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/// The link will be `None` if it could not be resolved (i.e. the error was cached).
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pub(crate) visited_links: FxHashMap<ResolutionInfo, Option<(Res, Option<UrlFragment>)>>,
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/// According to `rustc_resolve`, these links are ambiguous.
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///
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/// However, we cannot link to an item that has been stripped from the documentation. If all
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/// but one of the "possibilities" are stripped, then there is no real ambiguity. To determine
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/// if an ambiguity is real, we delay resolving them until after `Cache::populate`, then filter
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/// every item that doesn't have a cached path.
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///
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/// We could get correct results by simply delaying everything. This would have fewer happy
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/// codepaths, but we want to distinguish different kinds of error conditions, and this is easy
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/// to do by resolving links as soon as possible.
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pub(crate) ambiguous_links: FxIndexMap<(ItemId, String), Vec<AmbiguousLinks>>,
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}
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pub(crate) struct AmbiguousLinks {
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link_text: Box<str>,
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diag_info: OwnedDiagnosticInfo,
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resolved: Vec<(Res, Option<UrlFragment>)>,
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}
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impl<'tcx> LinkCollector<'_, 'tcx> {
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/// Given a full link, parse it as an [enum struct variant].
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///
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/// In particular, this will return an error whenever there aren't three
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/// full path segments left in the link.
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///
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/// [enum struct variant]: rustc_hir::VariantData::Struct
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fn variant_field<'path>(
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&self,
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path_str: &'path str,
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item_id: DefId,
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module_id: DefId,
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) -> Result<(Res, DefId), UnresolvedPath<'path>> {
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let tcx = self.cx.tcx;
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let no_res = || UnresolvedPath {
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item_id,
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module_id,
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partial_res: None,
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unresolved: path_str.into(),
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};
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debug!("looking for enum variant {path_str}");
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let mut split = path_str.rsplitn(3, "::");
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let variant_field_name = Symbol::intern(split.next().unwrap());
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// We're not sure this is a variant at all, so use the full string.
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// If there's no second component, the link looks like `[path]`.
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// So there's no partial res and we should say the whole link failed to resolve.
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let variant_name = Symbol::intern(split.next().ok_or_else(no_res)?);
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// If there's no third component, we saw `[a::b]` before and it failed to resolve.
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// So there's no partial res.
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let path = split.next().ok_or_else(no_res)?;
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let ty_res = self.resolve_path(path, TypeNS, item_id, module_id).ok_or_else(no_res)?;
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match ty_res {
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Res::Def(DefKind::Enum, did) => match tcx.type_of(did).instantiate_identity().kind() {
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ty::Adt(def, _) if def.is_enum() => {
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if let Some(variant) = def.variants().iter().find(|v| v.name == variant_name)
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&& let Some(field) =
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variant.fields.iter().find(|f| f.name == variant_field_name)
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{
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Ok((ty_res, field.did))
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} else {
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Err(UnresolvedPath {
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item_id,
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module_id,
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partial_res: Some(Res::Def(DefKind::Enum, def.did())),
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unresolved: variant_field_name.to_string().into(),
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})
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}
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}
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_ => unreachable!(),
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},
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_ => Err(UnresolvedPath {
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item_id,
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module_id,
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partial_res: Some(ty_res),
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unresolved: variant_name.to_string().into(),
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}),
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}
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}
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/// Given a primitive type, try to resolve an associated item.
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fn resolve_primitive_associated_item(
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&self,
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prim_ty: PrimitiveType,
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ns: Namespace,
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item_name: Symbol,
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) -> Vec<(Res, DefId)> {
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let tcx = self.cx.tcx;
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prim_ty
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.impls(tcx)
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.flat_map(|impl_| {
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filter_assoc_items_by_name_and_namespace(
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tcx,
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impl_,
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Ident::with_dummy_span(item_name),
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ns,
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)
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.map(|item| (Res::Primitive(prim_ty), item.def_id))
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})
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.collect::<Vec<_>>()
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}
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fn resolve_self_ty(&self, path_str: &str, ns: Namespace, item_id: DefId) -> Option<Res> {
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if ns != TypeNS || path_str != "Self" {
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return None;
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}
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let tcx = self.cx.tcx;
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let self_id = match tcx.def_kind(item_id) {
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def_kind @ (DefKind::AssocFn
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| DefKind::AssocConst
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| DefKind::AssocTy
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| DefKind::Variant
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| DefKind::Field) => {
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let parent_def_id = tcx.parent(item_id);
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if def_kind == DefKind::Field && tcx.def_kind(parent_def_id) == DefKind::Variant {
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tcx.parent(parent_def_id)
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} else {
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parent_def_id
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}
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}
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_ => item_id,
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};
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match tcx.def_kind(self_id) {
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DefKind::Impl { .. } => self.def_id_to_res(self_id),
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DefKind::Use => None,
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def_kind => Some(Res::Def(def_kind, self_id)),
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}
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}
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|
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/// Convenience wrapper around `doc_link_resolutions`.
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///
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/// This also handles resolving `true` and `false` as booleans.
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/// NOTE: `doc_link_resolutions` knows only about paths, not about types.
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/// Associated items will never be resolved by this function.
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fn resolve_path(
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&self,
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path_str: &str,
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ns: Namespace,
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item_id: DefId,
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module_id: DefId,
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) -> Option<Res> {
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if let res @ Some(..) = self.resolve_self_ty(path_str, ns, item_id) {
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return res;
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}
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// Resolver doesn't know about true, false, and types that aren't paths (e.g. `()`).
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let result = self
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.cx
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.tcx
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.doc_link_resolutions(module_id)
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.get(&(Symbol::intern(path_str), ns))
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.copied()
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// NOTE: do not remove this panic! Missing links should be recorded as `Res::Err`; if
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// `doc_link_resolutions` is missing a `path_str`, that means that there are valid links
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// that are being missed. To fix the ICE, change
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// `rustc_resolve::rustdoc::attrs_to_preprocessed_links` to cache the link.
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.unwrap_or_else(|| {
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span_bug!(
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self.cx.tcx.def_span(item_id),
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"no resolution for {path_str:?} {ns:?} {module_id:?}",
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)
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})
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.and_then(|res| res.try_into().ok())
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.or_else(|| resolve_primitive(path_str, ns));
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debug!("{path_str} resolved to {result:?} in namespace {ns:?}");
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result
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}
|
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|
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/// Resolves a string as a path within a particular namespace. Returns an
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/// optional URL fragment in the case of variants and methods.
|
|
fn resolve<'path>(
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&mut self,
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path_str: &'path str,
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ns: Namespace,
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disambiguator: Option<Disambiguator>,
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item_id: DefId,
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module_id: DefId,
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) -> Result<Vec<(Res, Option<DefId>)>, UnresolvedPath<'path>> {
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if let Some(res) = self.resolve_path(path_str, ns, item_id, module_id) {
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return Ok(match res {
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Res::Def(
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DefKind::AssocFn | DefKind::AssocConst | DefKind::AssocTy | DefKind::Variant,
|
|
def_id,
|
|
) => {
|
|
vec![(Res::from_def_id(self.cx.tcx, self.cx.tcx.parent(def_id)), Some(def_id))]
|
|
}
|
|
_ => vec![(res, None)],
|
|
});
|
|
} else if ns == MacroNS {
|
|
return Err(UnresolvedPath {
|
|
item_id,
|
|
module_id,
|
|
partial_res: None,
|
|
unresolved: path_str.into(),
|
|
});
|
|
}
|
|
|
|
// Try looking for methods and associated items.
|
|
// NB: `path_root` could be empty when resolving in the root namespace (e.g. `::std`).
|
|
let (path_root, item_str) = path_str.rsplit_once("::").ok_or_else(|| {
|
|
// If there's no `::`, it's not an associated item.
|
|
// So we can be sure that `rustc_resolve` was accurate when it said it wasn't resolved.
|
|
debug!("found no `::`, assuming {path_str} was correctly not in scope");
|
|
UnresolvedPath { item_id, module_id, partial_res: None, unresolved: path_str.into() }
|
|
})?;
|
|
let item_name = Symbol::intern(item_str);
|
|
|
|
// FIXME(#83862): this arbitrarily gives precedence to primitives over modules to support
|
|
// links to primitives when `#[rustc_doc_primitive]` is present. It should give an ambiguity
|
|
// error instead and special case *only* modules with `#[rustc_doc_primitive]`, not all
|
|
// primitives.
|
|
match resolve_primitive(path_root, TypeNS)
|
|
.or_else(|| self.resolve_path(path_root, TypeNS, item_id, module_id))
|
|
.map(|ty_res| {
|
|
self.resolve_associated_item(ty_res, item_name, ns, disambiguator, module_id)
|
|
.into_iter()
|
|
.map(|(res, def_id)| (res, Some(def_id)))
|
|
.collect::<Vec<_>>()
|
|
}) {
|
|
Some(r) if !r.is_empty() => Ok(r),
|
|
_ => {
|
|
if ns == Namespace::ValueNS {
|
|
self.variant_field(path_str, item_id, module_id)
|
|
.map(|(res, def_id)| vec![(res, Some(def_id))])
|
|
} else {
|
|
Err(UnresolvedPath {
|
|
item_id,
|
|
module_id,
|
|
partial_res: None,
|
|
unresolved: path_root.into(),
|
|
})
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Convert a DefId to a Res, where possible.
|
|
///
|
|
/// This is used for resolving type aliases.
|
|
fn def_id_to_res(&self, ty_id: DefId) -> Option<Res> {
|
|
use PrimitiveType::*;
|
|
Some(match *self.cx.tcx.type_of(ty_id).instantiate_identity().kind() {
|
|
ty::Bool => Res::Primitive(Bool),
|
|
ty::Char => Res::Primitive(Char),
|
|
ty::Int(ity) => Res::Primitive(ity.into()),
|
|
ty::Uint(uty) => Res::Primitive(uty.into()),
|
|
ty::Float(fty) => Res::Primitive(fty.into()),
|
|
ty::Str => Res::Primitive(Str),
|
|
ty::Tuple(tys) if tys.is_empty() => Res::Primitive(Unit),
|
|
ty::Tuple(_) => Res::Primitive(Tuple),
|
|
ty::Pat(..) => Res::Primitive(Pat),
|
|
ty::Array(..) => Res::Primitive(Array),
|
|
ty::Slice(_) => Res::Primitive(Slice),
|
|
ty::RawPtr(_, _) => Res::Primitive(RawPointer),
|
|
ty::Ref(..) => Res::Primitive(Reference),
|
|
ty::FnDef(..) => panic!("type alias to a function definition"),
|
|
ty::FnPtr(..) => Res::Primitive(Fn),
|
|
ty::Never => Res::Primitive(Never),
|
|
ty::Adt(ty::AdtDef(Interned(&ty::AdtDefData { did, .. }, _)), _) | ty::Foreign(did) => {
|
|
Res::from_def_id(self.cx.tcx, did)
|
|
}
|
|
ty::Alias(..)
|
|
| ty::Closure(..)
|
|
| ty::CoroutineClosure(..)
|
|
| ty::Coroutine(..)
|
|
| ty::CoroutineWitness(..)
|
|
| ty::Dynamic(..)
|
|
| ty::UnsafeBinder(_)
|
|
| ty::Param(_)
|
|
| ty::Bound(..)
|
|
| ty::Placeholder(_)
|
|
| ty::Infer(_)
|
|
| ty::Error(_) => return None,
|
|
})
|
|
}
|
|
|
|
/// Convert a PrimitiveType to a Ty, where possible.
|
|
///
|
|
/// This is used for resolving trait impls for primitives
|
|
fn primitive_type_to_ty(&mut self, prim: PrimitiveType) -> Option<Ty<'tcx>> {
|
|
use PrimitiveType::*;
|
|
let tcx = self.cx.tcx;
|
|
|
|
// FIXME: Only simple types are supported here, see if we can support
|
|
// other types such as Tuple, Array, Slice, etc.
|
|
// See https://github.com/rust-lang/rust/issues/90703#issuecomment-1004263455
|
|
Some(match prim {
|
|
Bool => tcx.types.bool,
|
|
Str => tcx.types.str_,
|
|
Char => tcx.types.char,
|
|
Never => tcx.types.never,
|
|
I8 => tcx.types.i8,
|
|
I16 => tcx.types.i16,
|
|
I32 => tcx.types.i32,
|
|
I64 => tcx.types.i64,
|
|
I128 => tcx.types.i128,
|
|
Isize => tcx.types.isize,
|
|
F16 => tcx.types.f16,
|
|
F32 => tcx.types.f32,
|
|
F64 => tcx.types.f64,
|
|
F128 => tcx.types.f128,
|
|
U8 => tcx.types.u8,
|
|
U16 => tcx.types.u16,
|
|
U32 => tcx.types.u32,
|
|
U64 => tcx.types.u64,
|
|
U128 => tcx.types.u128,
|
|
Usize => tcx.types.usize,
|
|
_ => return None,
|
|
})
|
|
}
|
|
|
|
/// Resolve an associated item, returning its containing page's `Res`
|
|
/// and the fragment targeting the associated item on its page.
|
|
fn resolve_associated_item(
|
|
&mut self,
|
|
root_res: Res,
|
|
item_name: Symbol,
|
|
ns: Namespace,
|
|
disambiguator: Option<Disambiguator>,
|
|
module_id: DefId,
|
|
) -> Vec<(Res, DefId)> {
|
|
let tcx = self.cx.tcx;
|
|
|
|
match root_res {
|
|
Res::Primitive(prim) => {
|
|
let items = self.resolve_primitive_associated_item(prim, ns, item_name);
|
|
if !items.is_empty() {
|
|
items
|
|
// Inherent associated items take precedence over items that come from trait impls.
|
|
} else {
|
|
self.primitive_type_to_ty(prim)
|
|
.map(|ty| {
|
|
resolve_associated_trait_item(ty, module_id, item_name, ns, self.cx)
|
|
.iter()
|
|
.map(|item| (root_res, item.def_id))
|
|
.collect::<Vec<_>>()
|
|
})
|
|
.unwrap_or_default()
|
|
}
|
|
}
|
|
Res::Def(DefKind::TyAlias, did) => {
|
|
// Resolve the link on the type the alias points to.
|
|
// FIXME: if the associated item is defined directly on the type alias,
|
|
// it will show up on its documentation page, we should link there instead.
|
|
let Some(res) = self.def_id_to_res(did) else { return Vec::new() };
|
|
self.resolve_associated_item(res, item_name, ns, disambiguator, module_id)
|
|
}
|
|
Res::Def(
|
|
def_kind @ (DefKind::Struct | DefKind::Union | DefKind::Enum | DefKind::ForeignTy),
|
|
did,
|
|
) => {
|
|
debug!("looking for associated item named {item_name} for item {did:?}");
|
|
// Checks if item_name is a variant of the `SomeItem` enum
|
|
if ns == TypeNS && def_kind == DefKind::Enum {
|
|
match tcx.type_of(did).instantiate_identity().kind() {
|
|
ty::Adt(adt_def, _) => {
|
|
for variant in adt_def.variants() {
|
|
if variant.name == item_name {
|
|
return vec![(root_res, variant.def_id)];
|
|
}
|
|
}
|
|
}
|
|
_ => unreachable!(),
|
|
}
|
|
}
|
|
|
|
let search_for_field = || {
|
|
let (DefKind::Struct | DefKind::Union) = def_kind else { return vec![] };
|
|
debug!("looking for fields named {item_name} for {did:?}");
|
|
// FIXME: this doesn't really belong in `associated_item` (maybe `variant_field` is better?)
|
|
// NOTE: it's different from variant_field because it only resolves struct fields,
|
|
// not variant fields (2 path segments, not 3).
|
|
//
|
|
// We need to handle struct (and union) fields in this code because
|
|
// syntactically their paths are identical to associated item paths:
|
|
// `module::Type::field` and `module::Type::Assoc`.
|
|
//
|
|
// On the other hand, variant fields can't be mistaken for associated
|
|
// items because they look like this: `module::Type::Variant::field`.
|
|
//
|
|
// Variants themselves don't need to be handled here, even though
|
|
// they also look like associated items (`module::Type::Variant`),
|
|
// because they are real Rust syntax (unlike the intra-doc links
|
|
// field syntax) and are handled by the compiler's resolver.
|
|
let ty::Adt(def, _) = tcx.type_of(did).instantiate_identity().kind() else {
|
|
unreachable!()
|
|
};
|
|
def.non_enum_variant()
|
|
.fields
|
|
.iter()
|
|
.filter(|field| field.name == item_name)
|
|
.map(|field| (root_res, field.did))
|
|
.collect::<Vec<_>>()
|
|
};
|
|
|
|
if let Some(Disambiguator::Kind(DefKind::Field)) = disambiguator {
|
|
return search_for_field();
|
|
}
|
|
|
|
// Checks if item_name belongs to `impl SomeItem`
|
|
let mut assoc_items: Vec<_> = tcx
|
|
.inherent_impls(did)
|
|
.iter()
|
|
.flat_map(|&imp| {
|
|
filter_assoc_items_by_name_and_namespace(
|
|
tcx,
|
|
imp,
|
|
Ident::with_dummy_span(item_name),
|
|
ns,
|
|
)
|
|
})
|
|
.map(|item| (root_res, item.def_id))
|
|
.collect();
|
|
|
|
if assoc_items.is_empty() {
|
|
// Check if item_name belongs to `impl SomeTrait for SomeItem`
|
|
// FIXME(#74563): This gives precedence to `impl SomeItem`:
|
|
// Although having both would be ambiguous, use impl version for compatibility's sake.
|
|
// To handle that properly resolve() would have to support
|
|
// something like [`ambi_fn`](<SomeStruct as SomeTrait>::ambi_fn)
|
|
assoc_items = resolve_associated_trait_item(
|
|
tcx.type_of(did).instantiate_identity(),
|
|
module_id,
|
|
item_name,
|
|
ns,
|
|
self.cx,
|
|
)
|
|
.into_iter()
|
|
.map(|item| (root_res, item.def_id))
|
|
.collect::<Vec<_>>();
|
|
}
|
|
|
|
debug!("got associated item {assoc_items:?}");
|
|
|
|
if !assoc_items.is_empty() {
|
|
return assoc_items;
|
|
}
|
|
|
|
if ns != Namespace::ValueNS {
|
|
return Vec::new();
|
|
}
|
|
|
|
search_for_field()
|
|
}
|
|
Res::Def(DefKind::Trait, did) => filter_assoc_items_by_name_and_namespace(
|
|
tcx,
|
|
did,
|
|
Ident::with_dummy_span(item_name),
|
|
ns,
|
|
)
|
|
.map(|item| {
|
|
let res = Res::Def(item.kind.as_def_kind(), item.def_id);
|
|
(res, item.def_id)
|
|
})
|
|
.collect::<Vec<_>>(),
|
|
_ => Vec::new(),
|
|
}
|
|
}
|
|
}
|
|
|
|
fn full_res(tcx: TyCtxt<'_>, (base, assoc_item): (Res, Option<DefId>)) -> Res {
|
|
assoc_item.map_or(base, |def_id| Res::from_def_id(tcx, def_id))
|
|
}
|
|
|
|
/// Look to see if a resolved item has an associated item named `item_name`.
|
|
///
|
|
/// Given `[std::io::Error::source]`, where `source` is unresolved, this would
|
|
/// find `std::error::Error::source` and return
|
|
/// `<io::Error as error::Error>::source`.
|
|
fn resolve_associated_trait_item<'a>(
|
|
ty: Ty<'a>,
|
|
module: DefId,
|
|
item_name: Symbol,
|
|
ns: Namespace,
|
|
cx: &mut DocContext<'a>,
|
|
) -> Vec<ty::AssocItem> {
|
|
// FIXME: this should also consider blanket impls (`impl<T> X for T`). Unfortunately
|
|
// `get_auto_trait_and_blanket_impls` is broken because the caching behavior is wrong. In the
|
|
// meantime, just don't look for these blanket impls.
|
|
|
|
// Next consider explicit impls: `impl MyTrait for MyType`
|
|
// Give precedence to inherent impls.
|
|
let traits = trait_impls_for(cx, ty, module);
|
|
let tcx = cx.tcx;
|
|
debug!("considering traits {traits:?}");
|
|
let candidates = traits
|
|
.iter()
|
|
.flat_map(|&(impl_, trait_)| {
|
|
filter_assoc_items_by_name_and_namespace(
|
|
tcx,
|
|
trait_,
|
|
Ident::with_dummy_span(item_name),
|
|
ns,
|
|
)
|
|
.map(move |trait_assoc| {
|
|
trait_assoc_to_impl_assoc_item(tcx, impl_, trait_assoc.def_id)
|
|
.unwrap_or(*trait_assoc)
|
|
})
|
|
})
|
|
.collect::<Vec<_>>();
|
|
// FIXME(#74563): warn about ambiguity
|
|
debug!("the candidates were {candidates:?}");
|
|
candidates
|
|
}
|
|
|
|
/// Find the associated item in the impl `impl_id` that corresponds to the
|
|
/// trait associated item `trait_assoc_id`.
|
|
///
|
|
/// This function returns `None` if no associated item was found in the impl.
|
|
/// This can occur when the trait associated item has a default value that is
|
|
/// not overridden in the impl.
|
|
///
|
|
/// This is just a wrapper around [`TyCtxt::impl_item_implementor_ids()`] and
|
|
/// [`TyCtxt::associated_item()`] (with some helpful logging added).
|
|
#[instrument(level = "debug", skip(tcx), ret)]
|
|
fn trait_assoc_to_impl_assoc_item<'tcx>(
|
|
tcx: TyCtxt<'tcx>,
|
|
impl_id: DefId,
|
|
trait_assoc_id: DefId,
|
|
) -> Option<ty::AssocItem> {
|
|
let trait_to_impl_assoc_map = tcx.impl_item_implementor_ids(impl_id);
|
|
debug!(?trait_to_impl_assoc_map);
|
|
let impl_assoc_id = *trait_to_impl_assoc_map.get(&trait_assoc_id)?;
|
|
debug!(?impl_assoc_id);
|
|
Some(tcx.associated_item(impl_assoc_id))
|
|
}
|
|
|
|
/// Given a type, return all trait impls in scope in `module` for that type.
|
|
/// Returns a set of pairs of `(impl_id, trait_id)`.
|
|
///
|
|
/// NOTE: this cannot be a query because more traits could be available when more crates are compiled!
|
|
/// So it is not stable to serialize cross-crate.
|
|
#[instrument(level = "debug", skip(cx))]
|
|
fn trait_impls_for<'a>(
|
|
cx: &mut DocContext<'a>,
|
|
ty: Ty<'a>,
|
|
module: DefId,
|
|
) -> FxIndexSet<(DefId, DefId)> {
|
|
let tcx = cx.tcx;
|
|
let mut impls = FxIndexSet::default();
|
|
|
|
for &trait_ in tcx.doc_link_traits_in_scope(module) {
|
|
tcx.for_each_relevant_impl(trait_, ty, |impl_| {
|
|
let trait_ref = tcx.impl_trait_ref(impl_).expect("this is not an inherent impl");
|
|
// Check if these are the same type.
|
|
let impl_type = trait_ref.skip_binder().self_ty();
|
|
trace!(
|
|
"comparing type {impl_type} with kind {kind:?} against type {ty:?}",
|
|
kind = impl_type.kind(),
|
|
);
|
|
// Fast path: if this is a primitive simple `==` will work
|
|
// NOTE: the `match` is necessary; see #92662.
|
|
// this allows us to ignore generics because the user input
|
|
// may not include the generic placeholders
|
|
// e.g. this allows us to match Foo (user comment) with Foo<T> (actual type)
|
|
let saw_impl = impl_type == ty
|
|
|| match (impl_type.kind(), ty.kind()) {
|
|
(ty::Adt(impl_def, _), ty::Adt(ty_def, _)) => {
|
|
debug!("impl def_id: {:?}, ty def_id: {:?}", impl_def.did(), ty_def.did());
|
|
impl_def.did() == ty_def.did()
|
|
}
|
|
_ => false,
|
|
};
|
|
|
|
if saw_impl {
|
|
impls.insert((impl_, trait_));
|
|
}
|
|
});
|
|
}
|
|
|
|
impls
|
|
}
|
|
|
|
/// Check for resolve collisions between a trait and its derive.
|
|
///
|
|
/// These are common and we should just resolve to the trait in that case.
|
|
fn is_derive_trait_collision<T>(ns: &PerNS<Result<Vec<(Res, T)>, ResolutionFailure<'_>>>) -> bool {
|
|
if let (Ok(type_ns), Ok(macro_ns)) = (&ns.type_ns, &ns.macro_ns) {
|
|
type_ns.iter().any(|(res, _)| matches!(res, Res::Def(DefKind::Trait, _)))
|
|
&& macro_ns
|
|
.iter()
|
|
.any(|(res, _)| matches!(res, Res::Def(DefKind::Macro(MacroKind::Derive), _)))
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
|
|
impl DocVisitor<'_> for LinkCollector<'_, '_> {
|
|
fn visit_item(&mut self, item: &Item) {
|
|
self.resolve_links(item);
|
|
self.visit_item_recur(item)
|
|
}
|
|
}
|
|
|
|
enum PreprocessingError {
|
|
/// User error: `[std#x#y]` is not valid
|
|
MultipleAnchors,
|
|
Disambiguator(MarkdownLinkRange, String),
|
|
MalformedGenerics(MalformedGenerics, String),
|
|
}
|
|
|
|
impl PreprocessingError {
|
|
fn report(&self, cx: &DocContext<'_>, diag_info: DiagnosticInfo<'_>) {
|
|
match self {
|
|
PreprocessingError::MultipleAnchors => report_multiple_anchors(cx, diag_info),
|
|
PreprocessingError::Disambiguator(range, msg) => {
|
|
disambiguator_error(cx, diag_info, range.clone(), msg.clone())
|
|
}
|
|
PreprocessingError::MalformedGenerics(err, path_str) => {
|
|
report_malformed_generics(cx, diag_info, *err, path_str)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Clone)]
|
|
struct PreprocessingInfo {
|
|
path_str: Box<str>,
|
|
disambiguator: Option<Disambiguator>,
|
|
extra_fragment: Option<String>,
|
|
link_text: Box<str>,
|
|
}
|
|
|
|
// Not a typedef to avoid leaking several private structures from this module.
|
|
pub(crate) struct PreprocessedMarkdownLink(
|
|
Result<PreprocessingInfo, PreprocessingError>,
|
|
MarkdownLink,
|
|
);
|
|
|
|
/// Returns:
|
|
/// - `None` if the link should be ignored.
|
|
/// - `Some(Err)` if the link should emit an error
|
|
/// - `Some(Ok)` if the link is valid
|
|
///
|
|
/// `link_buffer` is needed for lifetime reasons; it will always be overwritten and the contents ignored.
|
|
fn preprocess_link(
|
|
ori_link: &MarkdownLink,
|
|
dox: &str,
|
|
) -> Option<Result<PreprocessingInfo, PreprocessingError>> {
|
|
// [] is mostly likely not supposed to be a link
|
|
if ori_link.link.is_empty() {
|
|
return None;
|
|
}
|
|
|
|
// Bail early for real links.
|
|
if ori_link.link.contains('/') {
|
|
return None;
|
|
}
|
|
|
|
let stripped = ori_link.link.replace('`', "");
|
|
let mut parts = stripped.split('#');
|
|
|
|
let link = parts.next().unwrap();
|
|
let link = link.trim();
|
|
if link.is_empty() {
|
|
// This is an anchor to an element of the current page, nothing to do in here!
|
|
return None;
|
|
}
|
|
let extra_fragment = parts.next();
|
|
if parts.next().is_some() {
|
|
// A valid link can't have multiple #'s
|
|
return Some(Err(PreprocessingError::MultipleAnchors));
|
|
}
|
|
|
|
// Parse and strip the disambiguator from the link, if present.
|
|
let (disambiguator, path_str, link_text) = match Disambiguator::from_str(link) {
|
|
Ok(Some((d, path, link_text))) => (Some(d), path.trim(), link_text.trim()),
|
|
Ok(None) => (None, link, link),
|
|
Err((err_msg, relative_range)) => {
|
|
// Only report error if we would not have ignored this link. See issue #83859.
|
|
if !should_ignore_link_with_disambiguators(link) {
|
|
let disambiguator_range = match range_between_backticks(&ori_link.range, dox) {
|
|
MarkdownLinkRange::Destination(no_backticks_range) => {
|
|
MarkdownLinkRange::Destination(
|
|
(no_backticks_range.start + relative_range.start)
|
|
..(no_backticks_range.start + relative_range.end),
|
|
)
|
|
}
|
|
mdlr @ MarkdownLinkRange::WholeLink(_) => mdlr,
|
|
};
|
|
return Some(Err(PreprocessingError::Disambiguator(disambiguator_range, err_msg)));
|
|
} else {
|
|
return None;
|
|
}
|
|
}
|
|
};
|
|
|
|
if should_ignore_link(path_str) {
|
|
return None;
|
|
}
|
|
|
|
// Strip generics from the path.
|
|
let path_str = match strip_generics_from_path(path_str) {
|
|
Ok(path) => path,
|
|
Err(err) => {
|
|
debug!("link has malformed generics: {path_str}");
|
|
return Some(Err(PreprocessingError::MalformedGenerics(err, path_str.to_owned())));
|
|
}
|
|
};
|
|
|
|
// Sanity check to make sure we don't have any angle brackets after stripping generics.
|
|
assert!(!path_str.contains(['<', '>'].as_slice()));
|
|
|
|
// The link is not an intra-doc link if it still contains spaces after stripping generics.
|
|
if path_str.contains(' ') {
|
|
return None;
|
|
}
|
|
|
|
Some(Ok(PreprocessingInfo {
|
|
path_str,
|
|
disambiguator,
|
|
extra_fragment: extra_fragment.map(|frag| frag.to_owned()),
|
|
link_text: Box::<str>::from(link_text),
|
|
}))
|
|
}
|
|
|
|
fn preprocessed_markdown_links(s: &str) -> Vec<PreprocessedMarkdownLink> {
|
|
markdown_links(s, |link| {
|
|
preprocess_link(&link, s).map(|pp_link| PreprocessedMarkdownLink(pp_link, link))
|
|
})
|
|
}
|
|
|
|
impl LinkCollector<'_, '_> {
|
|
#[instrument(level = "debug", skip_all)]
|
|
fn resolve_links(&mut self, item: &Item) {
|
|
if !self.cx.render_options.document_private
|
|
&& let Some(def_id) = item.item_id.as_def_id()
|
|
&& let Some(def_id) = def_id.as_local()
|
|
&& !self.cx.tcx.effective_visibilities(()).is_exported(def_id)
|
|
&& !has_primitive_or_keyword_docs(&item.attrs.other_attrs)
|
|
{
|
|
// Skip link resolution for non-exported items.
|
|
return;
|
|
}
|
|
|
|
// We want to resolve in the lexical scope of the documentation.
|
|
// In the presence of re-exports, this is not the same as the module of the item.
|
|
// Rather than merging all documentation into one, resolve it one attribute at a time
|
|
// so we know which module it came from.
|
|
for (item_id, doc) in prepare_to_doc_link_resolution(&item.attrs.doc_strings) {
|
|
if !may_have_doc_links(&doc) {
|
|
continue;
|
|
}
|
|
debug!("combined_docs={doc}");
|
|
// NOTE: if there are links that start in one crate and end in another, this will not resolve them.
|
|
// This is a degenerate case and it's not supported by rustdoc.
|
|
let item_id = item_id.unwrap_or_else(|| item.item_id.expect_def_id());
|
|
let module_id = match self.cx.tcx.def_kind(item_id) {
|
|
DefKind::Mod if item.inner_docs(self.cx.tcx) => item_id,
|
|
_ => find_nearest_parent_module(self.cx.tcx, item_id).unwrap(),
|
|
};
|
|
for md_link in preprocessed_markdown_links(&doc) {
|
|
let link = self.resolve_link(&doc, item, item_id, module_id, &md_link);
|
|
if let Some(link) = link {
|
|
self.cx.cache.intra_doc_links.entry(item.item_id).or_default().insert(link);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub(crate) fn save_link(&mut self, item_id: ItemId, link: ItemLink) {
|
|
self.cx.cache.intra_doc_links.entry(item_id).or_default().insert(link);
|
|
}
|
|
|
|
/// This is the entry point for resolving an intra-doc link.
|
|
///
|
|
/// FIXME(jynelson): this is way too many arguments
|
|
fn resolve_link(
|
|
&mut self,
|
|
dox: &String,
|
|
item: &Item,
|
|
item_id: DefId,
|
|
module_id: DefId,
|
|
PreprocessedMarkdownLink(pp_link, ori_link): &PreprocessedMarkdownLink,
|
|
) -> Option<ItemLink> {
|
|
trace!("considering link '{}'", ori_link.link);
|
|
|
|
let diag_info = DiagnosticInfo {
|
|
item,
|
|
dox,
|
|
ori_link: &ori_link.link,
|
|
link_range: ori_link.range.clone(),
|
|
};
|
|
let PreprocessingInfo { path_str, disambiguator, extra_fragment, link_text } =
|
|
pp_link.as_ref().map_err(|err| err.report(self.cx, diag_info.clone())).ok()?;
|
|
let disambiguator = *disambiguator;
|
|
|
|
let mut resolved = self.resolve_with_disambiguator_cached(
|
|
ResolutionInfo {
|
|
item_id,
|
|
module_id,
|
|
dis: disambiguator,
|
|
path_str: path_str.clone(),
|
|
extra_fragment: extra_fragment.clone(),
|
|
},
|
|
diag_info.clone(), // this struct should really be Copy, but Range is not :(
|
|
// For reference-style links we want to report only one error so unsuccessful
|
|
// resolutions are cached, for other links we want to report an error every
|
|
// time so they are not cached.
|
|
matches!(ori_link.kind, LinkType::Reference | LinkType::Shortcut),
|
|
)?;
|
|
|
|
if resolved.len() > 1 {
|
|
let links = AmbiguousLinks {
|
|
link_text: link_text.clone(),
|
|
diag_info: diag_info.into(),
|
|
resolved,
|
|
};
|
|
|
|
self.ambiguous_links
|
|
.entry((item.item_id, path_str.to_string()))
|
|
.or_default()
|
|
.push(links);
|
|
None
|
|
} else if let Some((res, fragment)) = resolved.pop() {
|
|
self.compute_link(res, fragment, path_str, disambiguator, diag_info, link_text)
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
|
|
/// Returns `true` if a link could be generated from the given intra-doc information.
|
|
///
|
|
/// This is a very light version of `format::href_with_root_path` since we're only interested
|
|
/// about whether we can generate a link to an item or not.
|
|
///
|
|
/// * If `original_did` is local, then we check if the item is reexported or public.
|
|
/// * If `original_did` is not local, then we check if the crate it comes from is a direct
|
|
/// public dependency.
|
|
fn validate_link(&self, original_did: DefId) -> bool {
|
|
let tcx = self.cx.tcx;
|
|
let def_kind = tcx.def_kind(original_did);
|
|
let did = match def_kind {
|
|
DefKind::AssocTy | DefKind::AssocFn | DefKind::AssocConst | DefKind::Variant => {
|
|
// documented on their parent's page
|
|
tcx.parent(original_did)
|
|
}
|
|
// If this a constructor, we get the parent (either a struct or a variant) and then
|
|
// generate the link for this item.
|
|
DefKind::Ctor(..) => return self.validate_link(tcx.parent(original_did)),
|
|
DefKind::ExternCrate => {
|
|
// Link to the crate itself, not the `extern crate` item.
|
|
if let Some(local_did) = original_did.as_local() {
|
|
tcx.extern_mod_stmt_cnum(local_did).unwrap_or(LOCAL_CRATE).as_def_id()
|
|
} else {
|
|
original_did
|
|
}
|
|
}
|
|
_ => original_did,
|
|
};
|
|
|
|
let cache = &self.cx.cache;
|
|
if !original_did.is_local()
|
|
&& !cache.effective_visibilities.is_directly_public(tcx, did)
|
|
&& !cache.document_private
|
|
&& !cache.primitive_locations.values().any(|&id| id == did)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
cache.paths.get(&did).is_some()
|
|
|| cache.external_paths.contains_key(&did)
|
|
|| !did.is_local()
|
|
}
|
|
|
|
#[allow(rustc::potential_query_instability)]
|
|
pub(crate) fn resolve_ambiguities(&mut self) {
|
|
let mut ambiguous_links = mem::take(&mut self.ambiguous_links);
|
|
|
|
for ((item_id, path_str), info_items) in ambiguous_links.iter_mut() {
|
|
for info in info_items {
|
|
info.resolved.retain(|(res, _)| match res {
|
|
Res::Def(_, def_id) => self.validate_link(*def_id),
|
|
// Primitive types are always valid.
|
|
Res::Primitive(_) => true,
|
|
});
|
|
let diag_info = info.diag_info.into_info();
|
|
match info.resolved.len() {
|
|
1 => {
|
|
let (res, fragment) = info.resolved.pop().unwrap();
|
|
if let Some(link) = self.compute_link(
|
|
res,
|
|
fragment,
|
|
path_str,
|
|
None,
|
|
diag_info,
|
|
&info.link_text,
|
|
) {
|
|
self.save_link(*item_id, link);
|
|
}
|
|
}
|
|
0 => {
|
|
report_diagnostic(
|
|
self.cx.tcx,
|
|
BROKEN_INTRA_DOC_LINKS,
|
|
format!("all items matching `{path_str}` are private or doc(hidden)"),
|
|
&diag_info,
|
|
|diag, sp, _| {
|
|
if let Some(sp) = sp {
|
|
diag.span_label(sp, "unresolved link");
|
|
} else {
|
|
diag.note("unresolved link");
|
|
}
|
|
},
|
|
);
|
|
}
|
|
_ => {
|
|
let candidates = info
|
|
.resolved
|
|
.iter()
|
|
.map(|(res, fragment)| {
|
|
let def_id = if let Some(UrlFragment::Item(def_id)) = fragment {
|
|
Some(*def_id)
|
|
} else {
|
|
None
|
|
};
|
|
(*res, def_id)
|
|
})
|
|
.collect::<Vec<_>>();
|
|
ambiguity_error(self.cx, &diag_info, path_str, &candidates, true);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn compute_link(
|
|
&mut self,
|
|
mut res: Res,
|
|
fragment: Option<UrlFragment>,
|
|
path_str: &str,
|
|
disambiguator: Option<Disambiguator>,
|
|
diag_info: DiagnosticInfo<'_>,
|
|
link_text: &Box<str>,
|
|
) -> Option<ItemLink> {
|
|
// Check for a primitive which might conflict with a module
|
|
// Report the ambiguity and require that the user specify which one they meant.
|
|
// FIXME: could there ever be a primitive not in the type namespace?
|
|
if matches!(
|
|
disambiguator,
|
|
None | Some(Disambiguator::Namespace(Namespace::TypeNS) | Disambiguator::Primitive)
|
|
) && !matches!(res, Res::Primitive(_))
|
|
{
|
|
if let Some(prim) = resolve_primitive(path_str, TypeNS) {
|
|
// `prim@char`
|
|
if matches!(disambiguator, Some(Disambiguator::Primitive)) {
|
|
res = prim;
|
|
} else {
|
|
// `[char]` when a `char` module is in scope
|
|
let candidates = &[(res, res.def_id(self.cx.tcx)), (prim, None)];
|
|
ambiguity_error(self.cx, &diag_info, path_str, candidates, true);
|
|
return None;
|
|
}
|
|
}
|
|
}
|
|
|
|
match res {
|
|
Res::Primitive(_) => {
|
|
if let Some(UrlFragment::Item(id)) = fragment {
|
|
// We're actually resolving an associated item of a primitive, so we need to
|
|
// verify the disambiguator (if any) matches the type of the associated item.
|
|
// This case should really follow the same flow as the `Res::Def` branch below,
|
|
// but attempting to add a call to `clean::register_res` causes an ICE. @jyn514
|
|
// thinks `register_res` is only needed for cross-crate re-exports, but Rust
|
|
// doesn't allow statements like `use str::trim;`, making this a (hopefully)
|
|
// valid omission. See https://github.com/rust-lang/rust/pull/80660#discussion_r551585677
|
|
// for discussion on the matter.
|
|
let kind = self.cx.tcx.def_kind(id);
|
|
self.verify_disambiguator(path_str, kind, id, disambiguator, &diag_info)?;
|
|
} else {
|
|
match disambiguator {
|
|
Some(Disambiguator::Primitive | Disambiguator::Namespace(_)) | None => {}
|
|
Some(other) => {
|
|
self.report_disambiguator_mismatch(path_str, other, res, &diag_info);
|
|
return None;
|
|
}
|
|
}
|
|
}
|
|
|
|
res.def_id(self.cx.tcx).map(|page_id| ItemLink {
|
|
link: Box::<str>::from(diag_info.ori_link),
|
|
link_text: link_text.clone(),
|
|
page_id,
|
|
fragment,
|
|
})
|
|
}
|
|
Res::Def(kind, id) => {
|
|
let (kind_for_dis, id_for_dis) = if let Some(UrlFragment::Item(id)) = fragment {
|
|
(self.cx.tcx.def_kind(id), id)
|
|
} else {
|
|
(kind, id)
|
|
};
|
|
self.verify_disambiguator(
|
|
path_str,
|
|
kind_for_dis,
|
|
id_for_dis,
|
|
disambiguator,
|
|
&diag_info,
|
|
)?;
|
|
|
|
let page_id = clean::register_res(self.cx, rustc_hir::def::Res::Def(kind, id));
|
|
Some(ItemLink {
|
|
link: Box::<str>::from(diag_info.ori_link),
|
|
link_text: link_text.clone(),
|
|
page_id,
|
|
fragment,
|
|
})
|
|
}
|
|
}
|
|
}
|
|
|
|
fn verify_disambiguator(
|
|
&self,
|
|
path_str: &str,
|
|
kind: DefKind,
|
|
id: DefId,
|
|
disambiguator: Option<Disambiguator>,
|
|
diag_info: &DiagnosticInfo<'_>,
|
|
) -> Option<()> {
|
|
debug!("intra-doc link to {path_str} resolved to {:?}", (kind, id));
|
|
|
|
// Disallow e.g. linking to enums with `struct@`
|
|
debug!("saw kind {kind:?} with disambiguator {disambiguator:?}");
|
|
match (kind, disambiguator) {
|
|
| (DefKind::Const | DefKind::ConstParam | DefKind::AssocConst | DefKind::AnonConst, Some(Disambiguator::Kind(DefKind::Const)))
|
|
// NOTE: this allows 'method' to mean both normal functions and associated functions
|
|
// This can't cause ambiguity because both are in the same namespace.
|
|
| (DefKind::Fn | DefKind::AssocFn, Some(Disambiguator::Kind(DefKind::Fn)))
|
|
// These are namespaces; allow anything in the namespace to match
|
|
| (_, Some(Disambiguator::Namespace(_)))
|
|
// If no disambiguator given, allow anything
|
|
| (_, None)
|
|
// All of these are valid, so do nothing
|
|
=> {}
|
|
(actual, Some(Disambiguator::Kind(expected))) if actual == expected => {}
|
|
(_, Some(specified @ Disambiguator::Kind(_) | specified @ Disambiguator::Primitive)) => {
|
|
self.report_disambiguator_mismatch(path_str, specified, Res::Def(kind, id), diag_info);
|
|
return None;
|
|
}
|
|
}
|
|
|
|
// item can be non-local e.g. when using `#[rustc_doc_primitive = "pointer"]`
|
|
if let Some((src_id, dst_id)) = id.as_local().and_then(|dst_id| {
|
|
diag_info.item.item_id.expect_def_id().as_local().map(|src_id| (src_id, dst_id))
|
|
}) {
|
|
if self.cx.tcx.effective_visibilities(()).is_exported(src_id)
|
|
&& !self.cx.tcx.effective_visibilities(()).is_exported(dst_id)
|
|
{
|
|
privacy_error(self.cx, diag_info, path_str);
|
|
}
|
|
}
|
|
|
|
Some(())
|
|
}
|
|
|
|
fn report_disambiguator_mismatch(
|
|
&self,
|
|
path_str: &str,
|
|
specified: Disambiguator,
|
|
resolved: Res,
|
|
diag_info: &DiagnosticInfo<'_>,
|
|
) {
|
|
// The resolved item did not match the disambiguator; give a better error than 'not found'
|
|
let msg = format!("incompatible link kind for `{path_str}`");
|
|
let callback = |diag: &mut Diag<'_, ()>, sp: Option<rustc_span::Span>, link_range| {
|
|
let note = format!(
|
|
"this link resolved to {} {}, which is not {} {}",
|
|
resolved.article(),
|
|
resolved.descr(),
|
|
specified.article(),
|
|
specified.descr(),
|
|
);
|
|
if let Some(sp) = sp {
|
|
diag.span_label(sp, note);
|
|
} else {
|
|
diag.note(note);
|
|
}
|
|
suggest_disambiguator(resolved, diag, path_str, link_range, sp, diag_info);
|
|
};
|
|
report_diagnostic(self.cx.tcx, BROKEN_INTRA_DOC_LINKS, msg, diag_info, callback);
|
|
}
|
|
|
|
fn report_rawptr_assoc_feature_gate(
|
|
&self,
|
|
dox: &str,
|
|
ori_link: &MarkdownLinkRange,
|
|
item: &Item,
|
|
) {
|
|
let span = source_span_for_markdown_range(
|
|
self.cx.tcx,
|
|
dox,
|
|
ori_link.inner_range(),
|
|
&item.attrs.doc_strings,
|
|
)
|
|
.unwrap_or_else(|| item.attr_span(self.cx.tcx));
|
|
rustc_session::parse::feature_err(
|
|
self.cx.tcx.sess,
|
|
sym::intra_doc_pointers,
|
|
span,
|
|
"linking to associated items of raw pointers is experimental",
|
|
)
|
|
.with_note("rustdoc does not allow disambiguating between `*const` and `*mut`, and pointers are unstable until it does")
|
|
.emit();
|
|
}
|
|
|
|
fn resolve_with_disambiguator_cached(
|
|
&mut self,
|
|
key: ResolutionInfo,
|
|
diag: DiagnosticInfo<'_>,
|
|
// If errors are cached then they are only reported on first occurrence
|
|
// which we want in some cases but not in others.
|
|
cache_errors: bool,
|
|
) -> Option<Vec<(Res, Option<UrlFragment>)>> {
|
|
if let Some(res) = self.visited_links.get(&key) {
|
|
if res.is_some() || cache_errors {
|
|
return res.clone().map(|r| vec![r]);
|
|
}
|
|
}
|
|
|
|
let mut candidates = self.resolve_with_disambiguator(&key, diag.clone());
|
|
|
|
// FIXME: it would be nice to check that the feature gate was enabled in the original crate, not just ignore it altogether.
|
|
// However I'm not sure how to check that across crates.
|
|
if let Some(candidate) = candidates.first()
|
|
&& candidate.0 == Res::Primitive(PrimitiveType::RawPointer)
|
|
&& key.path_str.contains("::")
|
|
// We only want to check this if this is an associated item.
|
|
{
|
|
if key.item_id.is_local() && !self.cx.tcx.features().intra_doc_pointers() {
|
|
self.report_rawptr_assoc_feature_gate(diag.dox, &diag.link_range, diag.item);
|
|
return None;
|
|
} else {
|
|
candidates = vec![*candidate];
|
|
}
|
|
}
|
|
|
|
// If there are multiple items with the same "kind" (for example, both "associated types")
|
|
// and after removing duplicated kinds, only one remains, the `ambiguity_error` function
|
|
// won't emit an error. So at this point, we can just take the first candidate as it was
|
|
// the first retrieved and use it to generate the link.
|
|
if let [candidate, _candidate2, ..] = *candidates {
|
|
if !ambiguity_error(self.cx, &diag, &key.path_str, &candidates, false) {
|
|
candidates = vec![candidate];
|
|
}
|
|
}
|
|
|
|
let mut out = Vec::with_capacity(candidates.len());
|
|
for (res, def_id) in candidates {
|
|
let fragment = match (&key.extra_fragment, def_id) {
|
|
(Some(_), Some(def_id)) => {
|
|
report_anchor_conflict(self.cx, diag, def_id);
|
|
return None;
|
|
}
|
|
(Some(u_frag), None) => Some(UrlFragment::UserWritten(u_frag.clone())),
|
|
(None, Some(def_id)) => Some(UrlFragment::Item(def_id)),
|
|
(None, None) => None,
|
|
};
|
|
out.push((res, fragment));
|
|
}
|
|
if let [r] = out.as_slice() {
|
|
self.visited_links.insert(key, Some(r.clone()));
|
|
} else if cache_errors {
|
|
self.visited_links.insert(key, None);
|
|
}
|
|
Some(out)
|
|
}
|
|
|
|
/// After parsing the disambiguator, resolve the main part of the link.
|
|
fn resolve_with_disambiguator(
|
|
&mut self,
|
|
key: &ResolutionInfo,
|
|
diag: DiagnosticInfo<'_>,
|
|
) -> Vec<(Res, Option<DefId>)> {
|
|
let disambiguator = key.dis;
|
|
let path_str = &key.path_str;
|
|
let item_id = key.item_id;
|
|
let module_id = key.module_id;
|
|
|
|
match disambiguator.map(Disambiguator::ns) {
|
|
Some(expected_ns) => {
|
|
match self.resolve(path_str, expected_ns, disambiguator, item_id, module_id) {
|
|
Ok(candidates) => candidates,
|
|
Err(err) => {
|
|
// We only looked in one namespace. Try to give a better error if possible.
|
|
// FIXME: really it should be `resolution_failure` that does this, not `resolve_with_disambiguator`.
|
|
// See https://github.com/rust-lang/rust/pull/76955#discussion_r493953382 for a good approach.
|
|
let mut err = ResolutionFailure::NotResolved(err);
|
|
for other_ns in [TypeNS, ValueNS, MacroNS] {
|
|
if other_ns != expected_ns {
|
|
if let Ok(&[res, ..]) = self
|
|
.resolve(path_str, other_ns, None, item_id, module_id)
|
|
.as_deref()
|
|
{
|
|
err = ResolutionFailure::WrongNamespace {
|
|
res: full_res(self.cx.tcx, res),
|
|
expected_ns,
|
|
};
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
resolution_failure(self, diag, path_str, disambiguator, smallvec![err]);
|
|
vec![]
|
|
}
|
|
}
|
|
}
|
|
None => {
|
|
// Try everything!
|
|
let mut candidate = |ns| {
|
|
self.resolve(path_str, ns, None, item_id, module_id)
|
|
.map_err(ResolutionFailure::NotResolved)
|
|
};
|
|
|
|
let candidates = PerNS {
|
|
macro_ns: candidate(MacroNS),
|
|
type_ns: candidate(TypeNS),
|
|
value_ns: candidate(ValueNS).and_then(|v_res| {
|
|
for (res, _) in v_res.iter() {
|
|
// Constructors are picked up in the type namespace.
|
|
if let Res::Def(DefKind::Ctor(..), _) = res {
|
|
return Err(ResolutionFailure::WrongNamespace {
|
|
res: *res,
|
|
expected_ns: TypeNS,
|
|
});
|
|
}
|
|
}
|
|
Ok(v_res)
|
|
}),
|
|
};
|
|
|
|
let len = candidates
|
|
.iter()
|
|
.fold(0, |acc, res| if let Ok(res) = res { acc + res.len() } else { acc });
|
|
|
|
if len == 0 {
|
|
resolution_failure(
|
|
self,
|
|
diag,
|
|
path_str,
|
|
disambiguator,
|
|
candidates.into_iter().filter_map(|res| res.err()).collect(),
|
|
);
|
|
vec![]
|
|
} else if len == 1 {
|
|
candidates.into_iter().filter_map(|res| res.ok()).flatten().collect::<Vec<_>>()
|
|
} else {
|
|
let has_derive_trait_collision = is_derive_trait_collision(&candidates);
|
|
if len == 2 && has_derive_trait_collision {
|
|
candidates.type_ns.unwrap()
|
|
} else {
|
|
// If we're reporting an ambiguity, don't mention the namespaces that failed
|
|
let mut candidates = candidates.map(|candidate| candidate.ok());
|
|
// If there a collision between a trait and a derive, we ignore the derive.
|
|
if has_derive_trait_collision {
|
|
candidates.macro_ns = None;
|
|
}
|
|
candidates.into_iter().flatten().flatten().collect::<Vec<_>>()
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Get the section of a link between the backticks,
|
|
/// or the whole link if there aren't any backticks.
|
|
///
|
|
/// For example:
|
|
///
|
|
/// ```text
|
|
/// [`Foo`]
|
|
/// ^^^
|
|
/// ```
|
|
///
|
|
/// This function does nothing if `ori_link.range` is a `MarkdownLinkRange::WholeLink`.
|
|
fn range_between_backticks(ori_link_range: &MarkdownLinkRange, dox: &str) -> MarkdownLinkRange {
|
|
let range = match ori_link_range {
|
|
mdlr @ MarkdownLinkRange::WholeLink(_) => return mdlr.clone(),
|
|
MarkdownLinkRange::Destination(inner) => inner.clone(),
|
|
};
|
|
let ori_link_text = &dox[range.clone()];
|
|
let after_first_backtick_group = ori_link_text.bytes().position(|b| b != b'`').unwrap_or(0);
|
|
let before_second_backtick_group = ori_link_text
|
|
.bytes()
|
|
.skip(after_first_backtick_group)
|
|
.position(|b| b == b'`')
|
|
.unwrap_or(ori_link_text.len());
|
|
MarkdownLinkRange::Destination(
|
|
(range.start + after_first_backtick_group)..(range.start + before_second_backtick_group),
|
|
)
|
|
}
|
|
|
|
/// Returns true if we should ignore `link` due to it being unlikely
|
|
/// that it is an intra-doc link. `link` should still have disambiguators
|
|
/// if there were any.
|
|
///
|
|
/// The difference between this and [`should_ignore_link()`] is that this
|
|
/// check should only be used on links that still have disambiguators.
|
|
fn should_ignore_link_with_disambiguators(link: &str) -> bool {
|
|
link.contains(|ch: char| !(ch.is_alphanumeric() || ":_<>, !*&;@()".contains(ch)))
|
|
}
|
|
|
|
/// Returns true if we should ignore `path_str` due to it being unlikely
|
|
/// that it is an intra-doc link.
|
|
fn should_ignore_link(path_str: &str) -> bool {
|
|
path_str.contains(|ch: char| !(ch.is_alphanumeric() || ":_<>, !*&;".contains(ch)))
|
|
}
|
|
|
|
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
|
|
/// Disambiguators for a link.
|
|
enum Disambiguator {
|
|
/// `prim@`
|
|
///
|
|
/// This is buggy, see <https://github.com/rust-lang/rust/pull/77875#discussion_r503583103>
|
|
Primitive,
|
|
/// `struct@` or `f()`
|
|
Kind(DefKind),
|
|
/// `type@`
|
|
Namespace(Namespace),
|
|
}
|
|
|
|
impl Disambiguator {
|
|
/// Given a link, parse and return `(disambiguator, path_str, link_text)`.
|
|
///
|
|
/// This returns `Ok(Some(...))` if a disambiguator was found,
|
|
/// `Ok(None)` if no disambiguator was found, or `Err(...)`
|
|
/// if there was a problem with the disambiguator.
|
|
fn from_str(link: &str) -> Result<Option<(Self, &str, &str)>, (String, Range<usize>)> {
|
|
use Disambiguator::{Kind, Namespace as NS, Primitive};
|
|
|
|
let suffixes = [
|
|
// If you update this list, please also update the relevant rustdoc book section!
|
|
("!()", DefKind::Macro(MacroKind::Bang)),
|
|
("!{}", DefKind::Macro(MacroKind::Bang)),
|
|
("![]", DefKind::Macro(MacroKind::Bang)),
|
|
("()", DefKind::Fn),
|
|
("!", DefKind::Macro(MacroKind::Bang)),
|
|
];
|
|
|
|
if let Some(idx) = link.find('@') {
|
|
let (prefix, rest) = link.split_at(idx);
|
|
let d = match prefix {
|
|
// If you update this list, please also update the relevant rustdoc book section!
|
|
"struct" => Kind(DefKind::Struct),
|
|
"enum" => Kind(DefKind::Enum),
|
|
"trait" => Kind(DefKind::Trait),
|
|
"union" => Kind(DefKind::Union),
|
|
"module" | "mod" => Kind(DefKind::Mod),
|
|
"const" | "constant" => Kind(DefKind::Const),
|
|
"static" => Kind(DefKind::Static {
|
|
mutability: Mutability::Not,
|
|
nested: false,
|
|
safety: Safety::Safe,
|
|
}),
|
|
"function" | "fn" | "method" => Kind(DefKind::Fn),
|
|
"derive" => Kind(DefKind::Macro(MacroKind::Derive)),
|
|
"field" => Kind(DefKind::Field),
|
|
"variant" => Kind(DefKind::Variant),
|
|
"type" => NS(Namespace::TypeNS),
|
|
"value" => NS(Namespace::ValueNS),
|
|
"macro" => NS(Namespace::MacroNS),
|
|
"prim" | "primitive" => Primitive,
|
|
_ => return Err((format!("unknown disambiguator `{prefix}`"), 0..idx)),
|
|
};
|
|
|
|
for (suffix, kind) in suffixes {
|
|
if let Some(path_str) = rest.strip_suffix(suffix) {
|
|
if d.ns() != Kind(kind).ns() {
|
|
return Err((
|
|
format!("unmatched disambiguator `{prefix}` and suffix `{suffix}`"),
|
|
0..idx,
|
|
));
|
|
} else if path_str.len() > 1 {
|
|
// path_str != "@"
|
|
return Ok(Some((d, &path_str[1..], &rest[1..])));
|
|
}
|
|
}
|
|
}
|
|
|
|
Ok(Some((d, &rest[1..], &rest[1..])))
|
|
} else {
|
|
for (suffix, kind) in suffixes {
|
|
if let Some(path_str) = link.strip_suffix(suffix) {
|
|
// Avoid turning `!` or `()` into an empty string
|
|
if !path_str.is_empty() {
|
|
return Ok(Some((Kind(kind), path_str, link)));
|
|
}
|
|
}
|
|
}
|
|
Ok(None)
|
|
}
|
|
}
|
|
|
|
fn ns(self) -> Namespace {
|
|
match self {
|
|
Self::Namespace(n) => n,
|
|
// for purposes of link resolution, fields are in the value namespace.
|
|
Self::Kind(DefKind::Field) => ValueNS,
|
|
Self::Kind(k) => {
|
|
k.ns().expect("only DefKinds with a valid namespace can be disambiguators")
|
|
}
|
|
Self::Primitive => TypeNS,
|
|
}
|
|
}
|
|
|
|
fn article(self) -> &'static str {
|
|
match self {
|
|
Self::Namespace(_) => panic!("article() doesn't make sense for namespaces"),
|
|
Self::Kind(k) => k.article(),
|
|
Self::Primitive => "a",
|
|
}
|
|
}
|
|
|
|
fn descr(self) -> &'static str {
|
|
match self {
|
|
Self::Namespace(n) => n.descr(),
|
|
// HACK(jynelson): the source of `DefKind::descr` only uses the DefId for
|
|
// printing "module" vs "crate" so using the wrong ID is not a huge problem
|
|
Self::Kind(k) => k.descr(CRATE_DEF_ID.to_def_id()),
|
|
Self::Primitive => "builtin type",
|
|
}
|
|
}
|
|
}
|
|
|
|
/// A suggestion to show in a diagnostic.
|
|
enum Suggestion {
|
|
/// `struct@`
|
|
Prefix(&'static str),
|
|
/// `f()`
|
|
Function,
|
|
/// `m!`
|
|
Macro,
|
|
}
|
|
|
|
impl Suggestion {
|
|
fn descr(&self) -> Cow<'static, str> {
|
|
match self {
|
|
Self::Prefix(x) => format!("prefix with `{x}@`").into(),
|
|
Self::Function => "add parentheses".into(),
|
|
Self::Macro => "add an exclamation mark".into(),
|
|
}
|
|
}
|
|
|
|
fn as_help(&self, path_str: &str) -> String {
|
|
// FIXME: if this is an implied shortcut link, it's bad style to suggest `@`
|
|
match self {
|
|
Self::Prefix(prefix) => format!("{prefix}@{path_str}"),
|
|
Self::Function => format!("{path_str}()"),
|
|
Self::Macro => format!("{path_str}!"),
|
|
}
|
|
}
|
|
|
|
fn as_help_span(
|
|
&self,
|
|
ori_link: &str,
|
|
sp: rustc_span::Span,
|
|
) -> Vec<(rustc_span::Span, String)> {
|
|
let inner_sp = match ori_link.find('(') {
|
|
Some(index) if index != 0 && ori_link.as_bytes()[index - 1] == b'\\' => {
|
|
sp.with_hi(sp.lo() + BytePos((index - 1) as _))
|
|
}
|
|
Some(index) => sp.with_hi(sp.lo() + BytePos(index as _)),
|
|
None => sp,
|
|
};
|
|
let inner_sp = match ori_link.find('!') {
|
|
Some(index) if index != 0 && ori_link.as_bytes()[index - 1] == b'\\' => {
|
|
sp.with_hi(sp.lo() + BytePos((index - 1) as _))
|
|
}
|
|
Some(index) => inner_sp.with_hi(inner_sp.lo() + BytePos(index as _)),
|
|
None => inner_sp,
|
|
};
|
|
let inner_sp = match ori_link.find('@') {
|
|
Some(index) if index != 0 && ori_link.as_bytes()[index - 1] == b'\\' => {
|
|
sp.with_hi(sp.lo() + BytePos((index - 1) as _))
|
|
}
|
|
Some(index) => inner_sp.with_lo(inner_sp.lo() + BytePos(index as u32 + 1)),
|
|
None => inner_sp,
|
|
};
|
|
match self {
|
|
Self::Prefix(prefix) => {
|
|
// FIXME: if this is an implied shortcut link, it's bad style to suggest `@`
|
|
let mut sugg = vec![(sp.with_hi(inner_sp.lo()), format!("{prefix}@"))];
|
|
if sp.hi() != inner_sp.hi() {
|
|
sugg.push((inner_sp.shrink_to_hi().with_hi(sp.hi()), String::new()));
|
|
}
|
|
sugg
|
|
}
|
|
Self::Function => {
|
|
let mut sugg = vec![(inner_sp.shrink_to_hi().with_hi(sp.hi()), "()".to_string())];
|
|
if sp.lo() != inner_sp.lo() {
|
|
sugg.push((inner_sp.shrink_to_lo().with_lo(sp.lo()), String::new()));
|
|
}
|
|
sugg
|
|
}
|
|
Self::Macro => {
|
|
let mut sugg = vec![(inner_sp.shrink_to_hi(), "!".to_string())];
|
|
if sp.lo() != inner_sp.lo() {
|
|
sugg.push((inner_sp.shrink_to_lo().with_lo(sp.lo()), String::new()));
|
|
}
|
|
sugg
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Reports a diagnostic for an intra-doc link.
|
|
///
|
|
/// If no link range is provided, or the source span of the link cannot be determined, the span of
|
|
/// the entire documentation block is used for the lint. If a range is provided but the span
|
|
/// calculation fails, a note is added to the diagnostic pointing to the link in the markdown.
|
|
///
|
|
/// The `decorate` callback is invoked in all cases to allow further customization of the
|
|
/// diagnostic before emission. If the span of the link was able to be determined, the second
|
|
/// parameter of the callback will contain it, and the primary span of the diagnostic will be set
|
|
/// to it.
|
|
fn report_diagnostic(
|
|
tcx: TyCtxt<'_>,
|
|
lint: &'static Lint,
|
|
msg: impl Into<DiagMessage> + Display,
|
|
DiagnosticInfo { item, ori_link: _, dox, link_range }: &DiagnosticInfo<'_>,
|
|
decorate: impl FnOnce(&mut Diag<'_, ()>, Option<rustc_span::Span>, MarkdownLinkRange),
|
|
) {
|
|
let Some(hir_id) = DocContext::as_local_hir_id(tcx, item.item_id) else {
|
|
// If non-local, no need to check anything.
|
|
info!("ignoring warning from parent crate: {msg}");
|
|
return;
|
|
};
|
|
|
|
let sp = item.attr_span(tcx);
|
|
|
|
tcx.node_span_lint(lint, hir_id, sp, |lint| {
|
|
lint.primary_message(msg);
|
|
|
|
let (span, link_range) = match link_range {
|
|
MarkdownLinkRange::Destination(md_range) => {
|
|
let mut md_range = md_range.clone();
|
|
let sp =
|
|
source_span_for_markdown_range(tcx, dox, &md_range, &item.attrs.doc_strings)
|
|
.map(|mut sp| {
|
|
while dox.as_bytes().get(md_range.start) == Some(&b' ')
|
|
|| dox.as_bytes().get(md_range.start) == Some(&b'`')
|
|
{
|
|
md_range.start += 1;
|
|
sp = sp.with_lo(sp.lo() + BytePos(1));
|
|
}
|
|
while dox.as_bytes().get(md_range.end - 1) == Some(&b' ')
|
|
|| dox.as_bytes().get(md_range.end - 1) == Some(&b'`')
|
|
{
|
|
md_range.end -= 1;
|
|
sp = sp.with_hi(sp.hi() - BytePos(1));
|
|
}
|
|
sp
|
|
});
|
|
(sp, MarkdownLinkRange::Destination(md_range))
|
|
}
|
|
MarkdownLinkRange::WholeLink(md_range) => (
|
|
source_span_for_markdown_range(tcx, dox, md_range, &item.attrs.doc_strings),
|
|
link_range.clone(),
|
|
),
|
|
};
|
|
|
|
if let Some(sp) = span {
|
|
lint.span(sp);
|
|
} else {
|
|
// blah blah blah\nblah\nblah [blah] blah blah\nblah blah
|
|
// ^ ~~~~
|
|
// | link_range
|
|
// last_new_line_offset
|
|
let md_range = link_range.inner_range().clone();
|
|
let last_new_line_offset = dox[..md_range.start].rfind('\n').map_or(0, |n| n + 1);
|
|
let line = dox[last_new_line_offset..].lines().next().unwrap_or("");
|
|
|
|
// Print the line containing the `md_range` and manually mark it with '^'s.
|
|
lint.note(format!(
|
|
"the link appears in this line:\n\n{line}\n\
|
|
{indicator: <before$}{indicator:^<found$}",
|
|
indicator = "",
|
|
before = md_range.start - last_new_line_offset,
|
|
found = md_range.len(),
|
|
));
|
|
}
|
|
|
|
decorate(lint, span, link_range);
|
|
});
|
|
}
|
|
|
|
/// Reports a link that failed to resolve.
|
|
///
|
|
/// This also tries to resolve any intermediate path segments that weren't
|
|
/// handled earlier. For example, if passed `Item::Crate(std)` and `path_str`
|
|
/// `std::io::Error::x`, this will resolve `std::io::Error`.
|
|
fn resolution_failure(
|
|
collector: &mut LinkCollector<'_, '_>,
|
|
diag_info: DiagnosticInfo<'_>,
|
|
path_str: &str,
|
|
disambiguator: Option<Disambiguator>,
|
|
kinds: SmallVec<[ResolutionFailure<'_>; 3]>,
|
|
) {
|
|
let tcx = collector.cx.tcx;
|
|
report_diagnostic(
|
|
tcx,
|
|
BROKEN_INTRA_DOC_LINKS,
|
|
format!("unresolved link to `{path_str}`"),
|
|
&diag_info,
|
|
|diag, sp, link_range| {
|
|
let item = |res: Res| format!("the {} `{}`", res.descr(), res.name(tcx));
|
|
let assoc_item_not_allowed = |res: Res| {
|
|
let name = res.name(tcx);
|
|
format!(
|
|
"`{name}` is {} {}, not a module or type, and cannot have associated items",
|
|
res.article(),
|
|
res.descr()
|
|
)
|
|
};
|
|
// ignore duplicates
|
|
let mut variants_seen = SmallVec::<[_; 3]>::new();
|
|
for mut failure in kinds {
|
|
let variant = mem::discriminant(&failure);
|
|
if variants_seen.contains(&variant) {
|
|
continue;
|
|
}
|
|
variants_seen.push(variant);
|
|
|
|
if let ResolutionFailure::NotResolved(UnresolvedPath {
|
|
item_id,
|
|
module_id,
|
|
partial_res,
|
|
unresolved,
|
|
}) = &mut failure
|
|
{
|
|
use DefKind::*;
|
|
|
|
let item_id = *item_id;
|
|
let module_id = *module_id;
|
|
|
|
// Check if _any_ parent of the path gets resolved.
|
|
// If so, report it and say the first which failed; if not, say the first path segment didn't resolve.
|
|
let mut name = path_str;
|
|
'outer: loop {
|
|
// FIXME(jynelson): this might conflict with my `Self` fix in #76467
|
|
let Some((start, end)) = name.rsplit_once("::") else {
|
|
// avoid bug that marked [Quux::Z] as missing Z, not Quux
|
|
if partial_res.is_none() {
|
|
*unresolved = name.into();
|
|
}
|
|
break;
|
|
};
|
|
name = start;
|
|
for ns in [TypeNS, ValueNS, MacroNS] {
|
|
if let Ok(v_res) =
|
|
collector.resolve(start, ns, None, item_id, module_id)
|
|
{
|
|
debug!("found partial_res={v_res:?}");
|
|
if let Some(&res) = v_res.first() {
|
|
*partial_res = Some(full_res(tcx, res));
|
|
*unresolved = end.into();
|
|
break 'outer;
|
|
}
|
|
}
|
|
}
|
|
*unresolved = end.into();
|
|
}
|
|
|
|
let last_found_module = match *partial_res {
|
|
Some(Res::Def(DefKind::Mod, id)) => Some(id),
|
|
None => Some(module_id),
|
|
_ => None,
|
|
};
|
|
// See if this was a module: `[path]` or `[std::io::nope]`
|
|
if let Some(module) = last_found_module {
|
|
let note = if partial_res.is_some() {
|
|
// Part of the link resolved; e.g. `std::io::nonexistent`
|
|
let module_name = tcx.item_name(module);
|
|
format!("no item named `{unresolved}` in module `{module_name}`")
|
|
} else {
|
|
// None of the link resolved; e.g. `Notimported`
|
|
format!("no item named `{unresolved}` in scope")
|
|
};
|
|
if let Some(span) = sp {
|
|
diag.span_label(span, note);
|
|
} else {
|
|
diag.note(note);
|
|
}
|
|
|
|
if !path_str.contains("::") {
|
|
if disambiguator.is_none_or(|d| d.ns() == MacroNS)
|
|
&& collector
|
|
.cx
|
|
.tcx
|
|
.resolutions(())
|
|
.all_macro_rules
|
|
.contains_key(&Symbol::intern(path_str))
|
|
{
|
|
diag.note(format!(
|
|
"`macro_rules` named `{path_str}` exists in this crate, \
|
|
but it is not in scope at this link's location"
|
|
));
|
|
} else {
|
|
// If the link has `::` in it, assume it was meant to be an
|
|
// intra-doc link. Otherwise, the `[]` might be unrelated.
|
|
diag.help(
|
|
"to escape `[` and `]` characters, \
|
|
add '\\' before them like `\\[` or `\\]`",
|
|
);
|
|
}
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
// Otherwise, it must be an associated item or variant
|
|
let res = partial_res.expect("None case was handled by `last_found_module`");
|
|
let kind_did = match res {
|
|
Res::Def(kind, did) => Some((kind, did)),
|
|
Res::Primitive(_) => None,
|
|
};
|
|
let is_struct_variant = |did| {
|
|
if let ty::Adt(def, _) = tcx.type_of(did).instantiate_identity().kind()
|
|
&& def.is_enum()
|
|
&& let Some(variant) =
|
|
def.variants().iter().find(|v| v.name == res.name(tcx))
|
|
{
|
|
// ctor is `None` if variant is a struct
|
|
variant.ctor.is_none()
|
|
} else {
|
|
false
|
|
}
|
|
};
|
|
let path_description = if let Some((kind, did)) = kind_did {
|
|
match kind {
|
|
Mod | ForeignMod => "inner item",
|
|
Struct => "field or associated item",
|
|
Enum | Union => "variant or associated item",
|
|
Variant if is_struct_variant(did) => {
|
|
let variant = res.name(tcx);
|
|
let note = format!("variant `{variant}` has no such field");
|
|
if let Some(span) = sp {
|
|
diag.span_label(span, note);
|
|
} else {
|
|
diag.note(note);
|
|
}
|
|
return;
|
|
}
|
|
Variant
|
|
| Field
|
|
| Closure
|
|
| AssocTy
|
|
| AssocConst
|
|
| AssocFn
|
|
| Fn
|
|
| Macro(_)
|
|
| Const
|
|
| ConstParam
|
|
| ExternCrate
|
|
| Use
|
|
| LifetimeParam
|
|
| Ctor(_, _)
|
|
| AnonConst
|
|
| InlineConst => {
|
|
let note = assoc_item_not_allowed(res);
|
|
if let Some(span) = sp {
|
|
diag.span_label(span, note);
|
|
} else {
|
|
diag.note(note);
|
|
}
|
|
return;
|
|
}
|
|
Trait
|
|
| TyAlias { .. }
|
|
| ForeignTy
|
|
| OpaqueTy
|
|
| TraitAlias
|
|
| TyParam
|
|
| Static { .. } => "associated item",
|
|
Impl { .. } | GlobalAsm | SyntheticCoroutineBody => {
|
|
unreachable!("not a path")
|
|
}
|
|
}
|
|
} else {
|
|
"associated item"
|
|
};
|
|
let name = res.name(tcx);
|
|
let note = format!(
|
|
"the {res} `{name}` has no {disamb_res} named `{unresolved}`",
|
|
res = res.descr(),
|
|
disamb_res = disambiguator.map_or(path_description, |d| d.descr()),
|
|
);
|
|
if let Some(span) = sp {
|
|
diag.span_label(span, note);
|
|
} else {
|
|
diag.note(note);
|
|
}
|
|
|
|
continue;
|
|
}
|
|
let note = match failure {
|
|
ResolutionFailure::NotResolved { .. } => unreachable!("handled above"),
|
|
ResolutionFailure::WrongNamespace { res, expected_ns } => {
|
|
suggest_disambiguator(
|
|
res,
|
|
diag,
|
|
path_str,
|
|
link_range.clone(),
|
|
sp,
|
|
&diag_info,
|
|
);
|
|
|
|
if let Some(disambiguator) = disambiguator
|
|
&& !matches!(disambiguator, Disambiguator::Namespace(..))
|
|
{
|
|
format!(
|
|
"this link resolves to {}, which is not {} {}",
|
|
item(res),
|
|
disambiguator.article(),
|
|
disambiguator.descr()
|
|
)
|
|
} else {
|
|
format!(
|
|
"this link resolves to {}, which is not in the {} namespace",
|
|
item(res),
|
|
expected_ns.descr()
|
|
)
|
|
}
|
|
}
|
|
};
|
|
if let Some(span) = sp {
|
|
diag.span_label(span, note);
|
|
} else {
|
|
diag.note(note);
|
|
}
|
|
}
|
|
},
|
|
);
|
|
}
|
|
|
|
fn report_multiple_anchors(cx: &DocContext<'_>, diag_info: DiagnosticInfo<'_>) {
|
|
let msg = format!("`{}` contains multiple anchors", diag_info.ori_link);
|
|
anchor_failure(cx, diag_info, msg, 1)
|
|
}
|
|
|
|
fn report_anchor_conflict(cx: &DocContext<'_>, diag_info: DiagnosticInfo<'_>, def_id: DefId) {
|
|
let (link, kind) = (diag_info.ori_link, Res::from_def_id(cx.tcx, def_id).descr());
|
|
let msg = format!("`{link}` contains an anchor, but links to {kind}s are already anchored");
|
|
anchor_failure(cx, diag_info, msg, 0)
|
|
}
|
|
|
|
/// Report an anchor failure.
|
|
fn anchor_failure(
|
|
cx: &DocContext<'_>,
|
|
diag_info: DiagnosticInfo<'_>,
|
|
msg: String,
|
|
anchor_idx: usize,
|
|
) {
|
|
report_diagnostic(cx.tcx, BROKEN_INTRA_DOC_LINKS, msg, &diag_info, |diag, sp, _link_range| {
|
|
if let Some(mut sp) = sp {
|
|
if let Some((fragment_offset, _)) =
|
|
diag_info.ori_link.char_indices().filter(|(_, x)| *x == '#').nth(anchor_idx)
|
|
{
|
|
sp = sp.with_lo(sp.lo() + BytePos(fragment_offset as _));
|
|
}
|
|
diag.span_label(sp, "invalid anchor");
|
|
}
|
|
});
|
|
}
|
|
|
|
/// Report an error in the link disambiguator.
|
|
fn disambiguator_error(
|
|
cx: &DocContext<'_>,
|
|
mut diag_info: DiagnosticInfo<'_>,
|
|
disambiguator_range: MarkdownLinkRange,
|
|
msg: impl Into<DiagMessage> + Display,
|
|
) {
|
|
diag_info.link_range = disambiguator_range;
|
|
report_diagnostic(cx.tcx, BROKEN_INTRA_DOC_LINKS, msg, &diag_info, |diag, _sp, _link_range| {
|
|
let msg = format!(
|
|
"see {}/rustdoc/write-documentation/linking-to-items-by-name.html#namespaces-and-disambiguators for more info about disambiguators",
|
|
crate::DOC_RUST_LANG_ORG_VERSION
|
|
);
|
|
diag.note(msg);
|
|
});
|
|
}
|
|
|
|
fn report_malformed_generics(
|
|
cx: &DocContext<'_>,
|
|
diag_info: DiagnosticInfo<'_>,
|
|
err: MalformedGenerics,
|
|
path_str: &str,
|
|
) {
|
|
report_diagnostic(
|
|
cx.tcx,
|
|
BROKEN_INTRA_DOC_LINKS,
|
|
format!("unresolved link to `{path_str}`"),
|
|
&diag_info,
|
|
|diag, sp, _link_range| {
|
|
let note = match err {
|
|
MalformedGenerics::UnbalancedAngleBrackets => "unbalanced angle brackets",
|
|
MalformedGenerics::MissingType => "missing type for generic parameters",
|
|
MalformedGenerics::HasFullyQualifiedSyntax => {
|
|
diag.note(
|
|
"see https://github.com/rust-lang/rust/issues/74563 for more information",
|
|
);
|
|
"fully-qualified syntax is unsupported"
|
|
}
|
|
MalformedGenerics::InvalidPathSeparator => "has invalid path separator",
|
|
MalformedGenerics::TooManyAngleBrackets => "too many angle brackets",
|
|
MalformedGenerics::EmptyAngleBrackets => "empty angle brackets",
|
|
};
|
|
if let Some(span) = sp {
|
|
diag.span_label(span, note);
|
|
} else {
|
|
diag.note(note);
|
|
}
|
|
},
|
|
);
|
|
}
|
|
|
|
/// Report an ambiguity error, where there were multiple possible resolutions.
|
|
///
|
|
/// If all `candidates` have the same kind, it's not possible to disambiguate so in this case,
|
|
/// the function won't emit an error and will return `false`. Otherwise, it'll emit the error and
|
|
/// return `true`.
|
|
fn ambiguity_error(
|
|
cx: &DocContext<'_>,
|
|
diag_info: &DiagnosticInfo<'_>,
|
|
path_str: &str,
|
|
candidates: &[(Res, Option<DefId>)],
|
|
emit_error: bool,
|
|
) -> bool {
|
|
let mut descrs = FxHashSet::default();
|
|
let kinds = candidates
|
|
.iter()
|
|
.map(
|
|
|(res, def_id)| {
|
|
if let Some(def_id) = def_id { Res::from_def_id(cx.tcx, *def_id) } else { *res }
|
|
},
|
|
)
|
|
.filter(|res| descrs.insert(res.descr()))
|
|
.collect::<Vec<_>>();
|
|
if descrs.len() == 1 {
|
|
// There is no way for users to disambiguate at this point, so better return the first
|
|
// candidate and not show a warning.
|
|
return false;
|
|
} else if !emit_error {
|
|
return true;
|
|
}
|
|
|
|
let mut msg = format!("`{path_str}` is ");
|
|
match kinds.as_slice() {
|
|
[res1, res2] => {
|
|
msg += &format!(
|
|
"both {} {} and {} {}",
|
|
res1.article(),
|
|
res1.descr(),
|
|
res2.article(),
|
|
res2.descr()
|
|
);
|
|
}
|
|
_ => {
|
|
let mut kinds = kinds.iter().peekable();
|
|
while let Some(res) = kinds.next() {
|
|
if kinds.peek().is_some() {
|
|
msg += &format!("{} {}, ", res.article(), res.descr());
|
|
} else {
|
|
msg += &format!("and {} {}", res.article(), res.descr());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
report_diagnostic(cx.tcx, BROKEN_INTRA_DOC_LINKS, msg, diag_info, |diag, sp, link_range| {
|
|
if let Some(sp) = sp {
|
|
diag.span_label(sp, "ambiguous link");
|
|
} else {
|
|
diag.note("ambiguous link");
|
|
}
|
|
|
|
for res in kinds {
|
|
suggest_disambiguator(res, diag, path_str, link_range.clone(), sp, diag_info);
|
|
}
|
|
});
|
|
true
|
|
}
|
|
|
|
/// In case of an ambiguity or mismatched disambiguator, suggest the correct
|
|
/// disambiguator.
|
|
fn suggest_disambiguator(
|
|
res: Res,
|
|
diag: &mut Diag<'_, ()>,
|
|
path_str: &str,
|
|
link_range: MarkdownLinkRange,
|
|
sp: Option<rustc_span::Span>,
|
|
diag_info: &DiagnosticInfo<'_>,
|
|
) {
|
|
let suggestion = res.disambiguator_suggestion();
|
|
let help = format!("to link to the {}, {}", res.descr(), suggestion.descr());
|
|
|
|
let ori_link = match link_range {
|
|
MarkdownLinkRange::Destination(range) => Some(&diag_info.dox[range]),
|
|
MarkdownLinkRange::WholeLink(_) => None,
|
|
};
|
|
|
|
if let (Some(sp), Some(ori_link)) = (sp, ori_link) {
|
|
let mut spans = suggestion.as_help_span(ori_link, sp);
|
|
if spans.len() > 1 {
|
|
diag.multipart_suggestion(help, spans, Applicability::MaybeIncorrect);
|
|
} else {
|
|
let (sp, suggestion_text) = spans.pop().unwrap();
|
|
diag.span_suggestion_verbose(sp, help, suggestion_text, Applicability::MaybeIncorrect);
|
|
}
|
|
} else {
|
|
diag.help(format!("{help}: {}", suggestion.as_help(path_str)));
|
|
}
|
|
}
|
|
|
|
/// Report a link from a public item to a private one.
|
|
fn privacy_error(cx: &DocContext<'_>, diag_info: &DiagnosticInfo<'_>, path_str: &str) {
|
|
let sym;
|
|
let item_name = match diag_info.item.name {
|
|
Some(name) => {
|
|
sym = name;
|
|
sym.as_str()
|
|
}
|
|
None => "<unknown>",
|
|
};
|
|
let msg = format!("public documentation for `{item_name}` links to private item `{path_str}`");
|
|
|
|
report_diagnostic(cx.tcx, PRIVATE_INTRA_DOC_LINKS, msg, diag_info, |diag, sp, _link_range| {
|
|
if let Some(sp) = sp {
|
|
diag.span_label(sp, "this item is private");
|
|
}
|
|
|
|
let note_msg = if cx.render_options.document_private {
|
|
"this link resolves only because you passed `--document-private-items`, but will break without"
|
|
} else {
|
|
"this link will resolve properly if you pass `--document-private-items`"
|
|
};
|
|
diag.note(note_msg);
|
|
});
|
|
}
|
|
|
|
/// Resolve a primitive type or value.
|
|
fn resolve_primitive(path_str: &str, ns: Namespace) -> Option<Res> {
|
|
if ns != TypeNS {
|
|
return None;
|
|
}
|
|
use PrimitiveType::*;
|
|
let prim = match path_str {
|
|
"isize" => Isize,
|
|
"i8" => I8,
|
|
"i16" => I16,
|
|
"i32" => I32,
|
|
"i64" => I64,
|
|
"i128" => I128,
|
|
"usize" => Usize,
|
|
"u8" => U8,
|
|
"u16" => U16,
|
|
"u32" => U32,
|
|
"u64" => U64,
|
|
"u128" => U128,
|
|
"f16" => F16,
|
|
"f32" => F32,
|
|
"f64" => F64,
|
|
"f128" => F128,
|
|
"char" => Char,
|
|
"bool" | "true" | "false" => Bool,
|
|
"str" | "&str" => Str,
|
|
// See #80181 for why these don't have symbols associated.
|
|
"slice" => Slice,
|
|
"array" => Array,
|
|
"tuple" => Tuple,
|
|
"unit" => Unit,
|
|
"pointer" | "*const" | "*mut" => RawPointer,
|
|
"reference" | "&" | "&mut" => Reference,
|
|
"fn" => Fn,
|
|
"never" | "!" => Never,
|
|
_ => return None,
|
|
};
|
|
debug!("resolved primitives {prim:?}");
|
|
Some(Res::Primitive(prim))
|
|
}
|