Improve code readability

Author: GuillaumeGomez

src/librustdoc/html/static/main.js

@@ -138,6 +138,22 @@ function getSearchElement() {
         }
     }
 
+    function showSearchResults(search) {
+        if (search === null || typeof search === 'undefined') {
+            search = getSearchElement();
+        }
+        addClass(main, "hidden");
+        removeClass(search, "hidden");
+    }
+
+    function hideSearchResults(search) {
+        if (search === null || typeof search === 'undefined') {
+            search = getSearchElement();
+        }
+        addClass(search, "hidden");
+        removeClass(main, "hidden");
+    }
+
     // used for special search precedence
     var TY_PRIMITIVE = itemTypes.indexOf("primitive");
     var TY_KEYWORD = itemTypes.indexOf("keyword");
@@ -169,8 +185,7 @@ function getSearchElement() {
         if (ev !== null && search && !hasClass(search, "hidden") && ev.newURL) {
             // This block occurs when clicking on an element in the navbar while
             // in a search.
-            addClass(search, "hidden");
-            removeClass(main, "hidden");
+            hideSearchResults(search);
             var hash = ev.newURL.slice(ev.newURL.indexOf("#") + 1);
             if (browserSupportsHistoryApi()) {
                 history.replaceState(hash, "", "?search=#" + hash);
@@ -324,16 +339,14 @@ function getSearchElement() {
     }
 
     function handleEscape(ev) {
-        debugger;
         var help = getHelpElement();
         var search = getSearchElement();
         hideModal();
         if (hasClass(help, "hidden") === false) {
             displayHelp(false, ev, help);
         } else if (hasClass(search, "hidden") === false) {
             ev.preventDefault();
-            addClass(search, "hidden");
-            removeClass(main, "hidden");
+            hideSearchResults(search);
             document.title = titleBeforeSearch;
         }
         defocusSearchBar();
@@ -1265,8 +1278,7 @@ function getSearchElement() {
                 }
                 dst = dst[0];
                 if (window.location.pathname === dst.pathname) {
-                    addClass(getSearchElement(), "hidden");
-                    removeClass(main, "hidden");
+                    hideSearchResults();
                     document.location.href = dst.href;
                 }
             };
@@ -1341,8 +1353,6 @@ function getSearchElement() {
                     e.preventDefault();
                 } else if (e.which === 16) { // shift
                     // Does nothing, it's just to avoid losing "focus" on the highlighted element.
-                } else if (e.which === 27) { // escape
-                    handleEscape(e);
                 } else if (actives[currentTab].length > 0) {
                     removeClass(actives[currentTab][0], "highlighted");
                 }
@@ -1492,10 +1502,9 @@ function getSearchElement() {
                 "</div><div id=\"results\">" +
                 ret_others[0] + ret_in_args[0] + ret_returned[0] + "</div>";
 
-            addClass(main, "hidden");
             var search = getSearchElement();
-            removeClass(search, "hidden");
             search.innerHTML = output;
+            showSearchResults(search);
             var tds = search.getElementsByTagName("td");
             var td_width = 0;
             if (tds.length > 0) {
@@ -1700,13 +1709,7 @@ function getSearchElement() {
                     if (browserSupportsHistoryApi()) {
                         history.replaceState("", window.currentCrate + " - Rust", "?search=");
                     }
-                    if (hasClass(main, "content")) {
-                        removeClass(main, "hidden");
-                    }
-                    var search_c = getSearchElement();
-                    if (hasClass(search_c, "content")) {
-                        addClass(search_c, "hidden");
-                    }
+                    hideSearchResults();
                 } else {
                     searchTimeout = setTimeout(search, 500);
                 }
@@ -1742,19 +1745,8 @@ function getSearchElement() {
                 // Store the previous <title> so we can revert back to it later.
                 var previousTitle = document.title;
 
-                window.onpopstate = function(e) {
+                window.addEventListener("popstate", function(e) {
                     var params = getQueryStringParams();
-                    // When browsing back from search results the main page
-                    // visibility must be reset.
-                    if (!params.search) {
-                        if (hasClass(main, "content")) {
-                            removeClass(main, "hidden");
-                        }
-                        var search_c = getSearchElement();
-                        if (hasClass(search_c, "content")) {
-                            addClass(search_c, "hidden");
-                        }
-                    }
                     // Revert to the previous title manually since the History
                     // API ignores the title parameter.
                     document.title = previousTitle;
@@ -1766,18 +1758,21 @@ function getSearchElement() {
                     // perform the search. This will empty the bar if there's
                     // nothing there, which lets you really go back to a
                     // previous state with nothing in the bar.
-                    if (params.search) {
+                    if (params.search && params.search.length > 0) {
                         search_input.value = params.search;
+                        // Some browsers fire "onpopstate" for every page load
+                        // (Chrome), while others fire the event only when actually
+                        // popping a state (Firefox), which is why search() is
+                        // called both here and at the end of the startSearch()
+                        // function.
+                        search(e);
                     } else {
                         search_input.value = "";
+                        // When browsing back from search results the main page
+                        // visibility must be reset.
+                        hideSearchResults();
                     }
-                    // Some browsers fire "onpopstate" for every page load
-                    // (Chrome), while others fire the event only when actually
-                    // popping a state (Firefox), which is why search() is
-                    // called both here and at the end of the startSearch()
-                    // function.
-                    search();
-                };
+                });
             }
             search();
         }
@@ -2523,9 +2518,9 @@ function getSearchElement() {
     }
 
     function putBackSearch(search_input) {
-        if (search_input.value !== "") {
-            addClass(main, "hidden");
-            removeClass(getSearchElement(), "hidden");
+        var search = getSearchElement();
+        if (search_input.value !== "" && hasClass(search, "hidden")) {
+            showSearchResults(search);
             if (browserSupportsHistoryApi()) {
                 history.replaceState(search_input.value,
                                      "",
@@ -2542,10 +2537,9 @@ function getSearchElement() {
 
     var params = getQueryStringParams();
     if (params && params.search) {
-        addClass(main, "hidden");
         var search = getSearchElement();
-        removeClass(search, "hidden");
         search.innerHTML = "<h3 style=\"text-align: center;\">Loading search results...</h3>";
+        showSearchResults(search);
     }
 
     var sidebar_menu = document.getElementsByClassName("sidebar-menu")[0];