Merge pull request #400 from RohitPaul0007/patch-43

Update util.js

lib/util.js

@@ -2,7 +2,7 @@
 
 "use strict";
 
-var Graph = require("@dagrejs/graphlib").Graph;
+let Graph = require("@dagrejs/graphlib").Graph;
 
 module.exports = {
   addBorderNode,
@@ -30,7 +30,7 @@ module.exports = {
  * Adds a dummy node to the graph and return v.
  */
 function addDummyNode(g, type, attrs, name) {
-  var v;
+  let v;
   do {
     v = uniqueId(name);
   } while (g.hasNode(v));
@@ -45,11 +45,11 @@ function addDummyNode(g, type, attrs, name) {
  * associated with multi-edges.
  */
 function simplify(g) {
-  var simplified = new Graph().setGraph(g.graph());
+  let simplified = new Graph().setGraph(g.graph());
   g.nodes().forEach(v => simplified.setNode(v, g.node(v)));
   g.edges().forEach(e => {
-    var simpleLabel = simplified.edge(e.v, e.w) || { weight: 0, minlen: 1 };
-    var label = g.edge(e);
+    let simpleLabel = simplified.edge(e.v, e.w) || { weight: 0, minlen: 1 };
+    let label = g.edge(e);
     simplified.setEdge(e.v, e.w, {
       weight: simpleLabel.weight + label.weight,
       minlen: Math.max(simpleLabel.minlen, label.minlen)
@@ -59,7 +59,7 @@ function simplify(g) {
 }
 
 function asNonCompoundGraph(g) {
-  var simplified = new Graph({ multigraph: g.isMultigraph() }).setGraph(g.graph());
+  let simplified = new Graph({ multigraph: g.isMultigraph() }).setGraph(g.graph());
   g.nodes().forEach(v => {
     if (!g.children(v).length) {
       simplified.setNode(v, g.node(v));
@@ -72,8 +72,8 @@ function asNonCompoundGraph(g) {
 }
 
 function successorWeights(g) {
-  var weightMap = g.nodes().map(v => {
-    var sucs = {};
+  let weightMap = g.nodes().map(v => {
+    let sucs = {};
     g.outEdges(v).forEach(e => {
       sucs[e.w] = (sucs[e.w] || 0) + g.edge(e).weight;
     });
@@ -83,8 +83,8 @@ function successorWeights(g) {
 }
 
 function predecessorWeights(g) {
-  var weightMap = g.nodes().map(v => {
-    var preds = {};
+  let weightMap = g.nodes().map(v => {
+    let preds = {};
     g.inEdges(v).forEach(e => {
       preds[e.v] = (preds[e.v] || 0) + g.edge(e).weight;
     });
@@ -98,21 +98,21 @@ function predecessorWeights(g) {
  * ({x, y, width, height}) if it were pointing at the rectangle's center.
  */
 function intersectRect(rect, point) {
-  var x = rect.x;
-  var y = rect.y;
+  let x = rect.x;
+  let y = rect.y;
 
   // Rectangle intersection algorithm from:
   // http://math.stackexchange.com/questions/108113/find-edge-between-two-boxes
-  var dx = point.x - x;
-  var dy = point.y - y;
-  var w = rect.width / 2;
-  var h = rect.height / 2;
+  let dx = point.x - x;
+  let dy = point.y - y;
+  let w = rect.width / 2;
+  let h = rect.height / 2;
 
   if (!dx && !dy) {
     throw new Error("Not possible to find intersection inside of the rectangle");
   }
 
-  var sx, sy;
+  let sx, sy;
   if (Math.abs(dy) * w > Math.abs(dx) * h) {
     // Intersection is top or bottom of rect.
     if (dy < 0) {
@@ -137,10 +137,10 @@ function intersectRect(rect, point) {
  * function will produce a matrix with the ids of each node.
  */
 function buildLayerMatrix(g) {
-  var layering = range(maxRank(g) + 1).map(() => []);
+  let layering = range(maxRank(g) + 1).map(() => []);
   g.nodes().forEach(v => {
-    var node = g.node(v);
-    var rank = node.rank;
+    let node = g.node(v);
+    let rank = node.rank;
     if (rank !== undefined) {
       layering[rank][node.order] = v;
     }
@@ -153,16 +153,16 @@ function buildLayerMatrix(g) {
  * rank(v) >= 0 and at least one node w has rank(w) = 0.
  */
 function normalizeRanks(g) {
-  var min = Math.min(...g.nodes().map(v => {
-    var rank = g.node(v).rank;
+  let min = Math.min(...g.nodes().map(v => {
+    let rank = g.node(v).rank;
     if (rank === undefined) {
       return Number.MAX_VALUE;
     }
 
     return rank;
   }));
   g.nodes().forEach(v => {
-    var node = g.node(v);
+    let node = g.node(v);
     if (node.hasOwnProperty("rank")) {
       node.rank -= min;
     }