From 227f5ed679ed0ad997b6530df842d55980c8c90e Mon Sep 17 00:00:00 2001
From: Michael Howell <michael@notriddle.com>
Date: Thu, 1 Apr 2021 10:56:11 -0700
Subject: [PATCH] rustdoc: Separate filter-empty-string out into its own
 function

---
 src/librustdoc/html/static/main.js | 13 +++++++++++--
 src/tools/rustdoc-js/tester.js     |  3 ++-
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/librustdoc/html/static/main.js b/src/librustdoc/html/static/main.js
index 52c3ff68d9158..947c92982257b 100644
--- a/src/librustdoc/html/static/main.js
+++ b/src/librustdoc/html/static/main.js
@@ -219,6 +219,15 @@ function hideThemeButtonState() {
     var titleBeforeSearch = document.title;
     var searchTitle = null;
 
+    function removeEmptyStringsFromArray(x) {
+        for (var i = 0, len = x.length; i < len; ++i) {
+            if (x[i] === "") {
+                x.splice(i, 1);
+                i -= 1;
+            }
+        }
+    }
+
     function clearInputTimeout() {
         if (searchTimeout !== null) {
             clearTimeout(searchTimeout);
@@ -756,7 +765,7 @@ function hideThemeButtonState() {
                 results = {}, results_in_args = {}, results_returned = {},
                 split = valLower.split("::");
 
-            split = split.filter(function(segment) { return segment !== ""; });
+            removeEmptyStringsFromArray(split);
 
             function transformResults(results, isType) {
                 var out = [];
@@ -1338,7 +1347,7 @@ function hideThemeButtonState() {
                 var valGenerics = extractGenerics(val);
 
                 var paths = valLower.split("::");
-                paths = paths.filter(function(segment) { return segment !== ""; });
+                removeEmptyStringsFromArray(paths);
                 val = paths[paths.length - 1];
                 var contains = paths.slice(0, paths.length > 1 ? paths.length - 1 : 1);
 
diff --git a/src/tools/rustdoc-js/tester.js b/src/tools/rustdoc-js/tester.js
index c21277de33513..a551a97bda55d 100644
--- a/src/tools/rustdoc-js/tester.js
+++ b/src/tools/rustdoc-js/tester.js
@@ -264,7 +264,8 @@ function loadMainJsAndIndex(mainJs, searchIndex, storageJs, crate) {
     // execQuery last parameter is built in buildIndex.
     // buildIndex requires the hashmap from search-index.
     var functionsToLoad = ["buildHrefAndPath", "pathSplitter", "levenshtein", "validateResult",
-                           "handleAliases", "getQuery", "buildIndex", "execQuery", "execSearch"];
+                           "handleAliases", "getQuery", "buildIndex", "execQuery", "execSearch",
+                           "removeEmptyStringsFromArray"];
 
     ALIASES = {};
     finalJS += 'window = { "currentCrate": "' + crate + '", rootPath: "../" };\n';