Rollup merge of rust-lang#146448 - GuillaumeGomez:fix-literal-search-paths, r=lolbinarycat

[rustdoc] Correctly handle literal search on paths

Fixes rust-lang#146129.

cc ``@notriddle``
r? ``@lolbinarycat``

Author: Zalathar

src/librustdoc/html/static/js/search.js

@@ -3639,7 +3639,7 @@ class DocSearch {
             if (contains.length === 0) {
                 return 0;
             }
-            const maxPathEditDistance = Math.floor(
+            const maxPathEditDistance = parsedQuery.literalSearch ? 0 : Math.floor(
                 contains.reduce((acc, next) => acc + next.length, 0) / 3,
             );
             let ret_dist = maxPathEditDistance + 1;
@@ -3650,7 +3650,9 @@ class DocSearch {
                 let dist_total = 0;
                 for (let x = 0; x < clength; ++x) {
                     const [p, c] = [path[i + x], contains[x]];
-                    if (Math.floor((p.length - c.length) / 3) <= maxPathEditDistance &&
+                    if (parsedQuery.literalSearch && p !== c) {
+                        continue pathiter;
+                    } else if (Math.floor((p.length - c.length) / 3) <= maxPathEditDistance &&
                         p.indexOf(c) !== -1
                     ) {
                         // discount distance on substring match

tests/rustdoc-js/literal-path.js

@@ -0,0 +1,23 @@
+// exact-check
+
+// This test ensures that literal search is always applied on elements of the path.
+
+const EXPECTED = [
+    {
+        'query': '"some::path"',
+        'others': [
+            { 'path': 'literal_path::some', 'name': 'Path' },
+        ],
+    },
+    {
+        'query': '"somea::path"',
+        'others': [
+            { 'path': 'literal_path::somea', 'name': 'Path' },
+        ],
+    },
+    {
+        'query': '"soma::path"',
+        'others': [
+        ],
+    },
+];

tests/rustdoc-js/literal-path.rs

@@ -0,0 +1,7 @@
+pub mod some {
+    pub struct Path;
+}
+
+pub mod somea {
+    pub struct Path;
+}