diff mercurial/templates/static/mercurial.js @ 35160:69a865dc2ada

hgweb: define locally used variables as actually local in mercurial.js

Variables that are used or assigned without any declaration using var (or let,
or const) are considered global. In many cases this is inadvertent and actually
causes a variable leaking to a broader scope, such as a temporary variable used
inside a loop suddenly being accessible in global scope. (This corresponds to
"undef" option of jshint).

So this patch limits the scope of variables that don't need to be global. There
are a lot of helper variables in Graph.render() used in a loop, I've declared
them all on one line to reduce patch size. "radius" is special because it
wasn't passed to graph.vertex, but was used there (it worked because this
variable leaked to global scope). "window.graph" is created by an inline script
in graph.tmpl so that it can be used in ajaxScrollInit() function, this patch
makes this fact explicit by assigning window.graph to a local variable.

--- a/mercurial/templates/static/mercurial.js	Wed Nov 22 21:32:18 2017 +0800
+++ b/mercurial/templates/static/mercurial.js	Wed Nov 22 21:49:36 2017 +0800
@@ -94,6 +94,7 @@
 
 		var backgrounds = '';
 		var nodedata = '';
+		var line, start, end, color, x, y, x0, y0, x1, y1, column, radius;
 
 		for (var i = 0; i < data.length; i++) {
 
@@ -146,7 +147,7 @@
 			radius = this.box_size / 8;
 			x = this.cell[0] + this.box_size * column + this.box_size / 2;
 			y = this.bg[1] - this.bg_height / 2;
-			var add = this.vertex(x, y, color, parity, cur);
+			var add = this.vertex(x, y, radius, color, parity, cur);
 			backgrounds += add[0];
 			nodedata += add[1];
 
@@ -297,7 +298,7 @@
 }
 
 function makeRequest(url, method, onstart, onsuccess, onerror, oncomplete) {
-    xhr = new XMLHttpRequest();
+    var xhr = new XMLHttpRequest();
     xhr.onreadystatechange = function() {
         if (xhr.readyState === 4) {
             try {
@@ -344,8 +345,8 @@
                         containerSelector,
                         messageFormat,
                         mode) {
-    updateInitiated = false;
-    container = document.querySelector(containerSelector);
+    var updateInitiated = false;
+    var container = document.querySelector(containerSelector);
 
     function scrollHandler() {
         if (updateInitiated) {
@@ -382,6 +383,7 @@
                 },
                 function onsuccess(htmlText) {
                     if (mode === 'graph') {
+                        var graph = window.graph;
                         var sizes = htmlText.match(/^\s*<canvas id="graph" width="(\d+)" height="(\d+)"><\/canvas>$/m);
                         var addWidth = sizes[1];
                         var addHeight = sizes[2];
@@ -468,7 +470,7 @@
             continue;
         }
 
-        currentValue = form.getAttribute("data-" + key);
+        var currentValue = form.getAttribute("data-" + key);
         checkbox.checked = currentValue !== "0";
 
         // ignorews implies ignorewsamount and ignorewseol.