Auto merge of rust-lang#68668 - GuillaumeGomez:struct-variant-field-search, r=ollie27

Struct variant field search

Fixes rust-lang#16017.

Reopening of rust-lang#64724.

cc @tomjakubowski
cc @ollie27

r? @kinnison

Author: bors

src/librustdoc/html/render/cache.rs

@@ -43,7 +43,7 @@ crate struct Cache {
     /// found on that implementation.
     pub impls: FxHashMap<DefId, Vec<Impl>>,
 
-    /// Maintains a mapping of local crate `NodeId`s to the fully qualified name
+    /// Maintains a mapping of local crate `DefId`s to the fully qualified name
     /// and "short type description" of that node. This is used when generating
     /// URLs when a type is being linked to. External paths are not located in
     /// this map because the `External` type itself has all the information
@@ -358,6 +358,7 @@ impl DocFolder for Cache {
             | clean::ForeignTypeItem
             | clean::MacroItem(..)
             | clean::ProcMacroItem(..)
+            | clean::VariantItem(..)
                 if !self.stripped_mod =>
             {
                 // Re-exported items mean that the same id can show up twice
@@ -373,13 +374,6 @@ impl DocFolder for Cache {
                 }
                 self.add_aliases(&item);
             }
-            // Link variants to their parent enum because pages aren't emitted
-            // for each variant.
-            clean::VariantItem(..) if !self.stripped_mod => {
-                let mut stack = self.stack.clone();
-                stack.pop();
-                self.paths.insert(item.def_id, (stack, ItemType::Enum));
-            }
 
             clean::PrimitiveItem(..) => {
                 self.add_aliases(&item);
@@ -396,7 +390,8 @@ impl DocFolder for Cache {
             | clean::EnumItem(..)
             | clean::ForeignTypeItem
             | clean::StructItem(..)
-            | clean::UnionItem(..) => {
+            | clean::UnionItem(..)
+            | clean::VariantItem(..) => {
                 self.parent_stack.push(item.def_id);
                 self.parent_is_trait_impl = false;
                 true
@@ -564,7 +559,7 @@ fn extern_location(
 
 /// Builds the search index from the collected metadata
 fn build_index(krate: &clean::Crate, cache: &mut Cache) -> String {
-    let mut nodeid_to_pathid = FxHashMap::default();
+    let mut defid_to_pathid = FxHashMap::default();
     let mut crate_items = Vec::with_capacity(cache.search_index.len());
     let mut crate_paths = vec![];
 
@@ -586,21 +581,21 @@ fn build_index(krate: &clean::Crate, cache: &mut Cache) -> String {
         }
     }
 
-    // Reduce `NodeId` in paths into smaller sequential numbers,
+    // Reduce `DefId` in paths into smaller sequential numbers,
     // and prune the paths that do not appear in the index.
     let mut lastpath = String::new();
     let mut lastpathid = 0usize;
 
     for item in search_index {
-        item.parent_idx = item.parent.map(|nodeid| {
-            if nodeid_to_pathid.contains_key(&nodeid) {
-                *nodeid_to_pathid.get(&nodeid).expect("no pathid")
+        item.parent_idx = item.parent.map(|defid| {
+            if defid_to_pathid.contains_key(&defid) {
+                *defid_to_pathid.get(&defid).expect("no pathid")
             } else {
                 let pathid = lastpathid;
-                nodeid_to_pathid.insert(nodeid, pathid);
+                defid_to_pathid.insert(defid, pathid);
                 lastpathid += 1;
 
-                let &(ref fqp, short) = paths.get(&nodeid).unwrap();
+                let &(ref fqp, short) = paths.get(&defid).unwrap();
                 crate_paths.push((short, fqp.last().unwrap().clone()));
                 pathid
             }

src/librustdoc/html/static/main.js

@@ -1364,14 +1364,15 @@ function getSearchElement() {
             var href;
             var type = itemTypes[item.ty];
             var name = item.name;
+            var path = item.path;
 
             if (type === "mod") {
-                displayPath = item.path + "::";
-                href = rootPath + item.path.replace(/::/g, "/") + "/" +
+                displayPath = path + "::";
+                href = rootPath + path.replace(/::/g, "/") + "/" +
                        name + "/index.html";
             } else if (type === "primitive" || type === "keyword") {
                 displayPath = "";
-                href = rootPath + item.path.replace(/::/g, "/") +
+                href = rootPath + path.replace(/::/g, "/") +
                        "/" + type + "." + name + ".html";
             } else if (type === "externcrate") {
                 displayPath = "";
@@ -1380,14 +1381,27 @@ function getSearchElement() {
                 var myparent = item.parent;
                 var anchor = "#" + type + "." + name;
                 var parentType = itemTypes[myparent.ty];
+                var pageType = parentType;
+                var pageName = myparent.name;
+
                 if (parentType === "primitive") {
                     displayPath = myparent.name + "::";
+                } else if (type === "structfield" && parentType === "variant") {
+                    // Structfields belonging to variants are special: the
+                    // final path element is the enum name.
+                    var splitPath = item.path.split("::");
+                    var enumName = splitPath.pop();
+                    path = splitPath.join("::");
+                    displayPath = path + "::" + enumName + "::" + myparent.name + "::";
+                    anchor = "#variant." + myparent.name + ".field." + name;
+                    pageType = "enum";
+                    pageName = enumName;
                 } else {
-                    displayPath = item.path + "::" + myparent.name + "::";
+                    displayPath = path + "::" + myparent.name + "::";
                 }
-                href = rootPath + item.path.replace(/::/g, "/") +
-                       "/" + parentType +
-                       "." + myparent.name +
+                href = rootPath + path.replace(/::/g, "/") +
+                       "/" + pageType +
+                       "." + pageName +
                        ".html" + anchor;
             } else {
                 displayPath = item.path + "::";
@@ -1668,7 +1682,7 @@ function getSearchElement() {
                 //              (String) name]
                 var paths = rawSearchIndex[crate].p;
 
-                // convert `paths` into an object form
+                // convert `rawPaths` entries into object form
                 var len = paths.length;
                 for (i = 0; i < len; ++i) {
                     paths[i] = {ty: paths[i][0], name: paths[i][1]};

src/test/rustdoc-js/struct-like-variant.js

@@ -0,0 +1,7 @@
+const QUERY = 'name';
+
+const EXPECTED = {
+    'others': [
+        { 'path': 'struct_like_variant::Enum::Bar', 'name': 'name', 'desc': 'This is a name.' },
+    ],
+};

src/test/rustdoc-js/struct-like-variant.rs

@@ -0,0 +1,8 @@
+#![crate_name = "struct_like_variant"]
+
+pub enum Enum {
+    Bar {
+        /// This is a name.
+        name: String
+    }
+}