Rollup merge of #81021 - CraftSpider:rustdoc-remove-import, r=jyn514

Remove doctree::Import

Per the title. Part of cleaning up doctree

Author: m-ou-se

Diff for: src/librustdoc/clean/mod.rs

@@ -219,7 +219,6 @@ impl Clean<ExternalCrate> for CrateNum {
 impl Clean<Item> for doctree::Module<'_> {
     fn clean(&self, cx: &DocContext<'_>) -> Item {
         let mut items: Vec<Item> = vec![];
-        items.extend(self.imports.iter().flat_map(|x| x.clean(cx)));
         items.extend(self.foreigns.iter().map(|x| x.clean(cx)));
         items.extend(self.mods.iter().map(|x| x.clean(cx)));
         items.extend(self.items.iter().map(|x| x.clean(cx)).flatten());
@@ -2015,7 +2014,7 @@ impl Clean<Vec<Item>> for (&hir::Item<'_>, Option<Symbol>) {
                 ItemKind::Fn(ref sig, ref generics, body_id) => {
                     clean_fn_or_proc_macro(item, sig, generics, body_id, &mut name, cx)
                 }
-                hir::ItemKind::Trait(is_auto, unsafety, ref generics, ref bounds, ref item_ids) => {
+                ItemKind::Trait(is_auto, unsafety, ref generics, ref bounds, ref item_ids) => {
                     let items = item_ids
                         .iter()
                         .map(|ti| cx.tcx.hir().trait_item(ti.id).clean(cx))
@@ -2034,6 +2033,9 @@ impl Clean<Vec<Item>> for (&hir::Item<'_>, Option<Symbol>) {
                 ItemKind::ExternCrate(orig_name) => {
                     return clean_extern_crate(item, name, orig_name, cx);
                 }
+                ItemKind::Use(path, kind) => {
+                    return clean_use_statement(item, name, path, kind, cx);
+                }
                 _ => unreachable!("not yet converted"),
             };
 
@@ -2155,105 +2157,97 @@ fn clean_extern_crate(
     }]
 }
 
-impl Clean<Vec<Item>> for doctree::Import<'_> {
-    fn clean(&self, cx: &DocContext<'_>) -> Vec<Item> {
-        // We need this comparison because some imports (for std types for example)
-        // are "inserted" as well but directly by the compiler and they should not be
-        // taken into account.
-        if self.span.ctxt().outer_expn_data().kind == ExpnKind::AstPass(AstPass::StdImports) {
-            return Vec::new();
-        }
-
-        let (doc_meta_item, please_inline) = self.attrs.lists(sym::doc).get_word_attr(sym::inline);
-        let pub_underscore = self.vis.node.is_pub() && self.name == kw::Underscore;
-
-        if pub_underscore && please_inline {
-            rustc_errors::struct_span_err!(
-                cx.tcx.sess,
-                doc_meta_item.unwrap().span(),
-                E0780,
-                "anonymous imports cannot be inlined"
-            )
-            .span_label(self.span, "anonymous import")
-            .emit();
-        }
+fn clean_use_statement(
+    import: &hir::Item<'_>,
+    name: Symbol,
+    path: &hir::Path<'_>,
+    kind: hir::UseKind,
+    cx: &DocContext<'_>,
+) -> Vec<Item> {
+    // We need this comparison because some imports (for std types for example)
+    // are "inserted" as well but directly by the compiler and they should not be
+    // taken into account.
+    if import.span.ctxt().outer_expn_data().kind == ExpnKind::AstPass(AstPass::StdImports) {
+        return Vec::new();
+    }
+
+    let (doc_meta_item, please_inline) = import.attrs.lists(sym::doc).get_word_attr(sym::inline);
+    let pub_underscore = import.vis.node.is_pub() && name == kw::Underscore;
+
+    if pub_underscore && please_inline {
+        rustc_errors::struct_span_err!(
+            cx.tcx.sess,
+            doc_meta_item.unwrap().span(),
+            E0780,
+            "anonymous imports cannot be inlined"
+        )
+        .span_label(import.span, "anonymous import")
+        .emit();
+    }
 
-        // We consider inlining the documentation of `pub use` statements, but we
-        // forcefully don't inline if this is not public or if the
-        // #[doc(no_inline)] attribute is present.
-        // Don't inline doc(hidden) imports so they can be stripped at a later stage.
-        let mut denied = !self.vis.node.is_pub()
-            || pub_underscore
-            || self.attrs.iter().any(|a| {
-                a.has_name(sym::doc)
-                    && match a.meta_item_list() {
-                        Some(l) => {
-                            attr::list_contains_name(&l, sym::no_inline)
-                                || attr::list_contains_name(&l, sym::hidden)
-                        }
-                        None => false,
+    // We consider inlining the documentation of `pub use` statements, but we
+    // forcefully don't inline if this is not public or if the
+    // #[doc(no_inline)] attribute is present.
+    // Don't inline doc(hidden) imports so they can be stripped at a later stage.
+    let mut denied = !import.vis.node.is_pub()
+        || pub_underscore
+        || import.attrs.iter().any(|a| {
+            a.has_name(sym::doc)
+                && match a.meta_item_list() {
+                    Some(l) => {
+                        attr::list_contains_name(&l, sym::no_inline)
+                            || attr::list_contains_name(&l, sym::hidden)
                     }
-            });
-        // Also check whether imports were asked to be inlined, in case we're trying to re-export a
-        // crate in Rust 2018+
-        let path = self.path.clean(cx);
-        let inner = if self.glob {
-            if !denied {
-                let mut visited = FxHashSet::default();
-                if let Some(items) = inline::try_inline_glob(cx, path.res, &mut visited) {
-                    return items;
+                    None => false,
                 }
+        });
+
+    // Also check whether imports were asked to be inlined, in case we're trying to re-export a
+    // crate in Rust 2018+
+    let def_id = cx.tcx.hir().local_def_id(import.hir_id).to_def_id();
+    let path = path.clean(cx);
+    let inner = if kind == hir::UseKind::Glob {
+        if !denied {
+            let mut visited = FxHashSet::default();
+            if let Some(items) = inline::try_inline_glob(cx, path.res, &mut visited) {
+                return items;
             }
-            Import::new_glob(resolve_use_source(cx, path), true)
-        } else {
-            let name = self.name;
-            if !please_inline {
-                if let Res::Def(DefKind::Mod, did) = path.res {
-                    if !did.is_local() && did.index == CRATE_DEF_INDEX {
-                        // if we're `pub use`ing an extern crate root, don't inline it unless we
-                        // were specifically asked for it
-                        denied = true;
-                    }
+        }
+        Import::new_glob(resolve_use_source(cx, path), true)
+    } else {
+        if !please_inline {
+            if let Res::Def(DefKind::Mod, did) = path.res {
+                if !did.is_local() && did.index == CRATE_DEF_INDEX {
+                    // if we're `pub use`ing an extern crate root, don't inline it unless we
+                    // were specifically asked for it
+                    denied = true;
                 }
             }
-            if !denied {
-                let mut visited = FxHashSet::default();
+        }
+        if !denied {
+            let mut visited = FxHashSet::default();
 
-                if let Some(mut items) = inline::try_inline(
+            if let Some(mut items) = inline::try_inline(
+                cx,
+                cx.tcx.parent_module(import.hir_id).to_def_id(),
+                path.res,
+                name,
+                Some(import.attrs),
+                &mut visited,
+            ) {
+                items.push(Item::from_def_id_and_parts(
+                    def_id,
+                    None,
+                    ImportItem(Import::new_simple(name, resolve_use_source(cx, path), false)),
                     cx,
-                    cx.tcx.parent_module(self.id).to_def_id(),
-                    path.res,
-                    name,
-                    Some(self.attrs),
-                    &mut visited,
-                ) {
-                    items.push(Item {
-                        name: None,
-                        attrs: box self.attrs.clean(cx),
-                        source: self.span.clean(cx),
-                        def_id: cx.tcx.hir().local_def_id(self.id).to_def_id(),
-                        visibility: self.vis.clean(cx),
-                        kind: box ImportItem(Import::new_simple(
-                            self.name,
-                            resolve_use_source(cx, path),
-                            false,
-                        )),
-                    });
-                    return items;
-                }
+                ));
+                return items;
             }
-            Import::new_simple(name, resolve_use_source(cx, path), true)
-        };
+        }
+        Import::new_simple(name, resolve_use_source(cx, path), true)
+    };
 
-        vec![Item {
-            name: None,
-            attrs: box self.attrs.clean(cx),
-            source: self.span.clean(cx),
-            def_id: cx.tcx.hir().local_def_id(self.id).to_def_id(),
-            visibility: self.vis.clean(cx),
-            kind: box ImportItem(inner),
-        }]
-    }
+    vec![Item::from_def_id_and_parts(def_id, None, ImportItem(inner), cx)]
 }
 
 impl Clean<Item> for (&hir::ForeignItem<'_>, Option<Symbol>) {

Diff for: src/librustdoc/doctree.rs

@@ -2,7 +2,6 @@
 //! manner (and with prettier names) before cleaning.
 crate use self::StructType::*;
 
-use rustc_ast as ast;
 use rustc_span::{self, Span, Symbol};
 
 use rustc_hir as hir;
@@ -11,7 +10,6 @@ crate struct Module<'hir> {
     crate name: Option<Symbol>,
     crate where_outer: Span,
     crate where_inner: Span,
-    crate imports: Vec<Import<'hir>>,
     crate mods: Vec<Module<'hir>>,
     crate id: hir::HirId,
     // (item, renamed)
@@ -28,7 +26,6 @@ impl Module<'hir> {
             id: hir::CRATE_HIR_ID,
             where_outer: rustc_span::DUMMY_SP,
             where_inner: rustc_span::DUMMY_SP,
-            imports: Vec::new(),
             mods: Vec::new(),
             items: Vec::new(),
             foreigns: Vec::new(),
@@ -48,17 +45,6 @@ crate enum StructType {
     Unit,
 }
 
-#[derive(Debug)]
-crate struct Import<'hir> {
-    crate name: Symbol,
-    crate id: hir::HirId,
-    crate vis: &'hir hir::Visibility<'hir>,
-    crate attrs: &'hir [ast::Attribute],
-    crate path: &'hir hir::Path<'hir>,
-    crate glob: bool,
-    crate span: Span,
-}
-
 crate fn struct_type_from_def(vdata: &hir::VariantData<'_>) -> StructType {
     match *vdata {
         hir::VariantData::Struct(..) => Plain,

Diff for: src/librustdoc/visit_ast.rs

@@ -316,15 +316,7 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
                     }
                 }
 
-                om.imports.push(Import {
-                    name,
-                    id: item.hir_id,
-                    vis: &item.vis,
-                    attrs: &item.attrs,
-                    path,
-                    glob: is_glob,
-                    span: item.span,
-                });
+                om.items.push((item, renamed))
             }
             hir::ItemKind::Mod(ref m) => {
                 om.mods.push(self.visit_mod_contents(

Diff for: src/test/rustdoc-json/compare.py

@@ -7,6 +7,9 @@
 # and then create `yourtest.expected` by stripping unnecessary details from `yourtest.json`. If
 # you're on windows, replace `\` with `/`.
 
+# WARNING: The error messages produced by this may be misleading, in the case of list re-ordering
+#          it may point to apparently unrelated keys.
+
 import copy
 import sys
 import json

Diff for: src/test/rustdoc-json/nested.expected

@@ -41,8 +41,8 @@
       "inner": {
         "is_crate": false,
         "items": [
-          "0:7",
-          "0:4"
+          "0:4",
+          "0:7"
         ]
       },
       "kind": "module",