added methods src_root and location to External crate, remove extern_location function

src/librustdoc/clean/types.rs

@@ -4,6 +4,7 @@ use std::fmt;
 use std::hash::{Hash, Hasher};
 use std::iter::FromIterator;
 use std::lazy::SyncOnceCell as OnceCell;
+use std::path::PathBuf;
 use std::rc::Rc;
 use std::sync::Arc;
 use std::{slice, vec};
@@ -90,6 +91,57 @@ impl ExternalCrate {
         tcx.crate_name(self.crate_num)
     }
 
+    crate fn src_root(&self, tcx: TyCtxt<'_>) -> PathBuf {
+        match self.src(tcx) {
+            FileName::Real(ref p) => match p.local_path().parent() {
+                Some(p) => p.to_path_buf(),
+                None => PathBuf::new(),
+            },
+            _ => PathBuf::new(),
+        }
+    }
+
+    /// Attempts to find where an external crate is located, given that we're
+    /// rendering in to the specified source destination.
+    crate fn location(
+        &self,
+        extern_url: Option<&str>,
+        ast_attrs: &[ast::Attribute],
+        dst: &std::path::Path,
+        tcx: TyCtxt<'_>,
+    ) -> ExternalLocation {
+        use ExternalLocation::*;
+        // See if there's documentation generated into the local directory
+        let local_location = dst.join(&*self.name(tcx).as_str());
+        if local_location.is_dir() {
+            return Local;
+        }
+
+        if let Some(url) = extern_url {
+            let mut url = url.to_string();
+            if !url.ends_with('/') {
+                url.push('/');
+            }
+            return Remote(url);
+        }
+
+        // Failing that, see if there's an attribute specifying where to find this
+        // external crate
+        ast_attrs
+            .lists(sym::doc)
+            .filter(|a| a.has_name(sym::html_root_url))
+            .filter_map(|a| a.value_str())
+            .map(|url| {
+                let mut url = url.to_string();
+                if !url.ends_with('/') {
+                    url.push('/')
+                }
+                Remote(url)
+            })
+            .next()
+            .unwrap_or(Unknown) // Well, at least we tried.
+    }
+
     crate fn keywords(&self, tcx: TyCtxt<'_>) -> ThinVec<(DefId, Symbol)> {
         let root = self.def_id();
 

src/librustdoc/formats/cache.rs

@@ -6,7 +6,6 @@ use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_hir::def_id::{CrateNum, DefId, CRATE_DEF_INDEX};
 use rustc_middle::middle::privacy::AccessLevels;
 use rustc_middle::ty::TyCtxt;
-use rustc_span::source_map::FileName;
 use rustc_span::symbol::sym;
 use rustc_span::Symbol;
 
@@ -15,7 +14,7 @@ use crate::fold::DocFolder;
 use crate::formats::item_type::ItemType;
 use crate::formats::Impl;
 use crate::html::markdown::short_markdown_summary;
-use crate::html::render::cache::{extern_location, get_index_search_type, ExternalLocation};
+use crate::html::render::cache::{get_index_search_type, ExternalLocation};
 use crate::html::render::IndexItem;
 
 /// This cache is used to store information about the [`clean::Crate`] being
@@ -155,21 +154,13 @@ impl Cache {
         // Cache where all our extern crates are located
         // FIXME: this part is specific to HTML so it'd be nice to remove it from the common code
         for &(n, ref e) in &krate.externs {
-            let src_root = match e.src(tcx) {
-                FileName::Real(ref p) => match p.local_path().parent() {
-                    Some(p) => p.to_path_buf(),
-                    None => PathBuf::new(),
-                },
-                _ => PathBuf::new(),
-            };
             let name = e.name(tcx);
             let extern_url = extern_html_root_urls.get(&*name.as_str()).map(|u| &**u);
             let did = DefId { krate: n, index: CRATE_DEF_INDEX };
             self.extern_locations.insert(
                 n,
-                (name, src_root, extern_location(e, extern_url, tcx.get_attrs(did), &dst, tcx)),
+                (name, e.src_root(tcx), e.location(extern_url, tcx.get_attrs(did), &dst, tcx)),
             );
-
             self.external_paths.insert(did, (vec![name.to_string()], ItemType::Module));
         }
 

src/librustdoc/html/render/cache.rs

@@ -1,15 +1,13 @@
 use std::collections::BTreeMap;
-use std::path::Path;
 
-use rustc_ast::ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_middle::ty::TyCtxt;
-use rustc_span::symbol::{sym, Symbol};
+use rustc_span::symbol::Symbol;
 use serde::ser::{Serialize, SerializeStruct, Serializer};
 
 use crate::clean;
 use crate::clean::types::{
-    AttributesExt, FnDecl, FnRetTy, GenericBound, Generics, GetDefId, Type, WherePredicate,
+    FnDecl, FnRetTy, GenericBound, Generics, GetDefId, Type, WherePredicate,
 };
 use crate::formats::cache::Cache;
 use crate::formats::item_type::ItemType;
@@ -26,47 +24,6 @@ crate enum ExternalLocation {
     Unknown,
 }
 
-/// Attempts to find where an external crate is located, given that we're
-/// rendering in to the specified source destination.
-crate fn extern_location(
-    e: &clean::ExternalCrate,
-    extern_url: Option<&str>,
-    ast_attrs: &[ast::Attribute],
-    dst: &Path,
-    tcx: TyCtxt<'_>,
-) -> ExternalLocation {
-    use ExternalLocation::*;
-    // See if there's documentation generated into the local directory
-    let local_location = dst.join(&*e.name(tcx).as_str());
-    if local_location.is_dir() {
-        return Local;
-    }
-
-    if let Some(url) = extern_url {
-        let mut url = url.to_string();
-        if !url.ends_with('/') {
-            url.push('/');
-        }
-        return Remote(url);
-    }
-
-    // Failing that, see if there's an attribute specifying where to find this
-    // external crate
-    ast_attrs
-        .lists(sym::doc)
-        .filter(|a| a.has_name(sym::html_root_url))
-        .filter_map(|a| a.value_str())
-        .map(|url| {
-            let mut url = url.to_string();
-            if !url.ends_with('/') {
-                url.push('/')
-            }
-            Remote(url)
-        })
-        .next()
-        .unwrap_or(Unknown) // Well, at least we tried.
-}
-
 /// Builds the search index from the collected metadata
 crate fn build_index<'tcx>(krate: &clean::Crate, cache: &mut Cache, tcx: TyCtxt<'tcx>) -> String {
     let mut defid_to_pathid = FxHashMap::default();