From 6804a60fe4899fa83586bad51b45ad94ef215203 Mon Sep 17 00:00:00 2001
From: Mike Bostock <mbostock@gmail.com>
Date: Thu, 29 Sep 2011 21:53:22 -0700
Subject: [PATCH] Fix a bug with empty children arrays.

---
 d3.js                   |   2 +-
 d3.layout.js            | 113 +++++++++++++++++++++-------------------
 d3.layout.min.js        |   2 +-
 d3.min.js               |   2 +-
 package.json            |   2 +-
 src/core/core.js        |   2 +-
 src/layout/partition.js |   8 +--
 src/layout/tree.js      |  19 ++++---
 src/layout/treemap.js   |  86 +++++++++++++++---------------
 9 files changed, 125 insertions(+), 111 deletions(-)

diff --git a/d3.js b/d3.js
index bb206b0e1e8ee..02a3a504a1f08 100644
--- a/d3.js
+++ b/d3.js
@@ -10,7 +10,7 @@ try {
     d3_style_setProperty.call(this, name, value + "", priority);
   };
 }
-d3 = {version: "2.3.1"}; // semver
+d3 = {version: "2.3.2"}; // semver
 var d3_array = d3_arraySlice; // conversion for NodeLists
 
 function d3_arrayCopy(pseudoarray) {
diff --git a/d3.layout.js b/d3.layout.js
index bcfddc043beb5..2bfb9d32f13fa 100644
--- a/d3.layout.js
+++ b/d3.layout.js
@@ -560,9 +560,9 @@ d3.layout.partition = function() {
     node.y = node.depth * dy;
     node.dx = dx;
     node.dy = dy;
-    if (children) {
+    if (children && (n = children.length)) {
       var i = -1,
-          n = children.length,
+          n,
           c,
           d;
       dx = node.value ? dx / node.value : 0;
@@ -576,9 +576,9 @@ d3.layout.partition = function() {
   function depth(node) {
     var children = node.children,
         d = 0;
-    if (children) {
+    if (children && (n = children.length)) {
       var i = -1,
-          n = children.length;
+          n;
       while (++i < n) d = Math.max(d, depth(children[i]));
     }
     return 1 + d;
@@ -1477,9 +1477,9 @@ d3.layout.tree = function() {
     function secondWalk(node, x) {
       node.x = node._tree.prelim + x;
       var children = node.children;
-      if (children) {
+      if (children && (n = children.length)) {
         var i = -1,
-            n = children.length;
+            n;
         x += node._tree.mod;
         while (++i < n) {
           secondWalk(children[i], x);
@@ -1584,18 +1584,21 @@ function d3_layout_treeSeparation(a, b) {
 // }
 
 function d3_layout_treeLeft(node) {
-  return node.children ? node.children[0] : node._tree.thread;
+  var children = node.children;
+  return children && children.length ? children[0] : node._tree.thread;
 }
 
 function d3_layout_treeRight(node) {
-  return node.children ? node.children[node.children.length - 1] : node._tree.thread;
+  var children = node.children,
+      n;
+  return children && (n = children.length) ? children[n - 1] : node._tree.thread;
 }
 
 function d3_layout_treeSearch(node, compare) {
   var children = node.children;
-  if (children) {
+  if (children && (n = children.length)) {
     var child,
-        n = children.length,
+        n,
         i = -1;
     while (++i < n) {
       if (compare(child = d3_layout_treeSearch(children[i], compare), node) > 0) {
@@ -1621,11 +1624,11 @@ function d3_layout_treeDeepest(a, b) {
 function d3_layout_treeVisitAfter(node, callback) {
   function visit(node, previousSibling) {
     var children = node.children;
-    if (children) {
+    if (children && (n = children.length)) {
       var child,
           previousChild = null,
           i = -1,
-          n = children.length;
+          n;
       while (++i < n) {
         child = children[i];
         visit(child, previousChild);
@@ -1693,57 +1696,61 @@ d3.layout.treemap = function() {
 
   // Recursively arranges the specified node's children into squarified rows.
   function squarify(node) {
-    if (!node.children) return;
-    var rect = pad(node),
-        row = [],
-        children = node.children.slice(), // copy-on-write
-        child,
-        best = Infinity, // the best row score so far
-        score, // the current row score
-        u = Math.min(rect.dx, rect.dy), // initial orientation
-        n;
-    scale(children, rect.dx * rect.dy / node.value);
-    row.area = 0;
-    while ((n = children.length) > 0) {
-      row.push(child = children[n - 1]);
-      row.area += child.area;
-      if ((score = worst(row, u)) <= best) { // continue with this orientation
-        children.pop();
-        best = score;
-      } else { // abort, and try a different orientation
-        row.area -= row.pop().area;
-        position(row, u, rect, false);
-        u = Math.min(rect.dx, rect.dy);
+    var children = node.children;
+    if (children && children.length) {
+      var rect = pad(node),
+          row = [],
+          remaining = children.slice(), // copy-on-write
+          child,
+          best = Infinity, // the best row score so far
+          score, // the current row score
+          u = Math.min(rect.dx, rect.dy), // initial orientation
+          n;
+      scale(remaining, rect.dx * rect.dy / node.value);
+      row.area = 0;
+      while ((n = remaining.length) > 0) {
+        row.push(child = remaining[n - 1]);
+        row.area += child.area;
+        if ((score = worst(row, u)) <= best) { // continue with this orientation
+          remaining.pop();
+          best = score;
+        } else { // abort, and try a different orientation
+          row.area -= row.pop().area;
+          position(row, u, rect, false);
+          u = Math.min(rect.dx, rect.dy);
+          row.length = row.area = 0;
+          best = Infinity;
+        }
+      }
+      if (row.length) {
+        position(row, u, rect, true);
         row.length = row.area = 0;
-        best = Infinity;
       }
+      children.forEach(squarify);
     }
-    if (row.length) {
-      position(row, u, rect, true);
-      row.length = row.area = 0;
-    }
-    node.children.forEach(squarify);
   }
 
   // Recursively resizes the specified node's children into existing rows.
   // Preserves the existing layout!
   function stickify(node) {
-    if (!node.children) return;
-    var rect = pad(node),
-        children = node.children.slice(), // copy-on-write
-        child,
-        row = [];
-    scale(children, rect.dx * rect.dy / node.value);
-    row.area = 0;
-    while (child = children.pop()) {
-      row.push(child);
-      row.area += child.area;
-      if (child.z != null) {
-        position(row, child.z ? rect.dx : rect.dy, rect, !children.length);
-        row.length = row.area = 0;
+    var children = node.children;
+    if (children && children.length) {
+      var rect = pad(node),
+          remaining = children.slice(), // copy-on-write
+          child,
+          row = [];
+      scale(remaining, rect.dx * rect.dy / node.value);
+      row.area = 0;
+      while (child = remaining.pop()) {
+        row.push(child);
+        row.area += child.area;
+        if (child.z != null) {
+          position(row, child.z ? rect.dx : rect.dy, rect, !remaining.length);
+          row.length = row.area = 0;
+        }
       }
+      children.forEach(stickify);
     }
-    node.children.forEach(stickify);
   }
 
   // Computes the score for the specified row, as the worst aspect ratio.
diff --git a/d3.layout.min.js b/d3.layout.min.js
index e49c8c711920e..c7016b5c12b25 100644
--- a/d3.layout.min.js
+++ b/d3.layout.min.js
@@ -1 +1 @@
-(function(){function bc(a,b){var c=a.x+b[3],d=a.y+b[0],e=a.dx-b[1]-b[3],f=a.dy-b[0]-b[2];e<0&&(c+=e/2,e=0),f<0&&(d+=f/2,f=0);return{x:c,y:d,dx:e,dy:f}}function bb(a){return{x:a.x,y:a.y,dx:a.dx,dy:a.dy}}function ba(a,b,c){return a._tree.ancestor.parent==b.parent?a._tree.ancestor:c}function _(a,b,c){a=a._tree,b=b._tree;var d=c/(b.number-a.number);a.change+=d,b.change-=d,b.shift+=c,b.prelim+=c,b.mod+=c}function $(a){var b=0,c=0,d=a.children,e=d.length,f;while(--e>=0)f=d[e]._tree,f.prelim+=b,f.mod+=b,b+=f.shift+(c+=f.change)}function Z(a,b){function c(a,d){var e=a.children;if(e){var f,g=null,h=-1,i=e.length;while(++h<i)f=e[h],c(f,g),g=f}b(a,d)}c(a,null)}function Y(a,b){return a.depth-b.depth}function X(a,b){return b.x-a.x}function W(a,b){return a.x-b.x}function V(a,b){var c=a.children;if(c){var d,e=c.length,f=-1;while(++f<e)b(d=V(c[f],b),a)>0&&(a=d)}return a}function U(a){return a.children?a.children[a.children.length-1]:a._tree.thread}function T(a){return 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f(){d.apply(this,arguments),de||(de=dp(d3.svg.mouse(dk))),dw(dq()+a[2],d3.svg.mouse(dk),de)}function e(){d.apply(this,arguments),dd=dp(d3.svg.mouse(dk)),dm=!1,d3.event.preventDefault(),window.focus()}function d(){dh=a,di=b.zoom.dispatch,dj=d3.event.target,dk=this,dl=arguments}function c(){this.on("mousedown.zoom",e).on("mousewheel.zoom",f).on("DOMMouseScroll.zoom",f).on("dblclick.zoom",g).on("touchstart.zoom",h),d3.select(window).on("mousemove.zoom",dt).on("mouseup.zoom",du).on("touchmove.zoom",ds).on("touchend.zoom",dr).on("click.zoom",dv,!0)}var a=[0,0,0],b=d3.dispatch("zoom");c.on=function(a,d){b[a].add(d);return c};return c};var dc,dd,de,df={},dg=0,dh,di,dj,dk,dl,dm,dn})()
\ No newline at end of file
diff --git a/package.json b/package.json
index 57209f3466621..c6fce87cf6677 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "d3",
-  "version": "2.3.1",
+  "version": "2.3.2",
   "description": "A small, free JavaScript library for manipulating documents based on data.",
   "keywords": [
     "dom",
diff --git a/src/core/core.js b/src/core/core.js
index c720d84676102..d4c0366143747 100644
--- a/src/core/core.js
+++ b/src/core/core.js
@@ -1 +1 @@
-d3 = {version: "2.3.1"}; // semver
+d3 = {version: "2.3.2"}; // semver
diff --git a/src/layout/partition.js b/src/layout/partition.js
index d81f77221bc64..49257a94bbde2 100644
--- a/src/layout/partition.js
+++ b/src/layout/partition.js
@@ -8,9 +8,9 @@ d3.layout.partition = function() {
     node.y = node.depth * dy;
     node.dx = dx;
     node.dy = dy;
-    if (children) {
+    if (children && (n = children.length)) {
       var i = -1,
-          n = children.length,
+          n,
           c,
           d;
       dx = node.value ? dx / node.value : 0;
@@ -24,9 +24,9 @@ d3.layout.partition = function() {
   function depth(node) {
     var children = node.children,
         d = 0;
-    if (children) {
+    if (children && (n = children.length)) {
       var i = -1,
-          n = children.length;
+          n;
       while (++i < n) d = Math.max(d, depth(children[i]));
     }
     return 1 + d;
diff --git a/src/layout/tree.js b/src/layout/tree.js
index cd30a260e58a6..5b112b6615226 100644
--- a/src/layout/tree.js
+++ b/src/layout/tree.js
@@ -42,9 +42,9 @@ d3.layout.tree = function() {
     function secondWalk(node, x) {
       node.x = node._tree.prelim + x;
       var children = node.children;
-      if (children) {
+      if (children && (n = children.length)) {
         var i = -1,
-            n = children.length;
+            n;
         x += node._tree.mod;
         while (++i < n) {
           secondWalk(children[i], x);
@@ -149,18 +149,21 @@ function d3_layout_treeSeparation(a, b) {
 // }
 
 function d3_layout_treeLeft(node) {
-  return node.children ? node.children[0] : node._tree.thread;
+  var children = node.children;
+  return children && children.length ? children[0] : node._tree.thread;
 }
 
 function d3_layout_treeRight(node) {
-  return node.children ? node.children[node.children.length - 1] : node._tree.thread;
+  var children = node.children,
+      n;
+  return children && (n = children.length) ? children[n - 1] : node._tree.thread;
 }
 
 function d3_layout_treeSearch(node, compare) {
   var children = node.children;
-  if (children) {
+  if (children && (n = children.length)) {
     var child,
-        n = children.length,
+        n,
         i = -1;
     while (++i < n) {
       if (compare(child = d3_layout_treeSearch(children[i], compare), node) > 0) {
@@ -186,11 +189,11 @@ function d3_layout_treeDeepest(a, b) {
 function d3_layout_treeVisitAfter(node, callback) {
   function visit(node, previousSibling) {
     var children = node.children;
-    if (children) {
+    if (children && (n = children.length)) {
       var child,
           previousChild = null,
           i = -1,
-          n = children.length;
+          n;
       while (++i < n) {
         child = children[i];
         visit(child, previousChild);
diff --git a/src/layout/treemap.js b/src/layout/treemap.js
index ca0613a9021b8..9d8fff3123a87 100644
--- a/src/layout/treemap.js
+++ b/src/layout/treemap.js
@@ -24,57 +24,61 @@ d3.layout.treemap = function() {
 
   // Recursively arranges the specified node's children into squarified rows.
   function squarify(node) {
-    if (!node.children) return;
-    var rect = pad(node),
-        row = [],
-        children = node.children.slice(), // copy-on-write
-        child,
-        best = Infinity, // the best row score so far
-        score, // the current row score
-        u = Math.min(rect.dx, rect.dy), // initial orientation
-        n;
-    scale(children, rect.dx * rect.dy / node.value);
-    row.area = 0;
-    while ((n = children.length) > 0) {
-      row.push(child = children[n - 1]);
-      row.area += child.area;
-      if ((score = worst(row, u)) <= best) { // continue with this orientation
-        children.pop();
-        best = score;
-      } else { // abort, and try a different orientation
-        row.area -= row.pop().area;
-        position(row, u, rect, false);
-        u = Math.min(rect.dx, rect.dy);
+    var children = node.children;
+    if (children && children.length) {
+      var rect = pad(node),
+          row = [],
+          remaining = children.slice(), // copy-on-write
+          child,
+          best = Infinity, // the best row score so far
+          score, // the current row score
+          u = Math.min(rect.dx, rect.dy), // initial orientation
+          n;
+      scale(remaining, rect.dx * rect.dy / node.value);
+      row.area = 0;
+      while ((n = remaining.length) > 0) {
+        row.push(child = remaining[n - 1]);
+        row.area += child.area;
+        if ((score = worst(row, u)) <= best) { // continue with this orientation
+          remaining.pop();
+          best = score;
+        } else { // abort, and try a different orientation
+          row.area -= row.pop().area;
+          position(row, u, rect, false);
+          u = Math.min(rect.dx, rect.dy);
+          row.length = row.area = 0;
+          best = Infinity;
+        }
+      }
+      if (row.length) {
+        position(row, u, rect, true);
         row.length = row.area = 0;
-        best = Infinity;
       }
+      children.forEach(squarify);
     }
-    if (row.length) {
-      position(row, u, rect, true);
-      row.length = row.area = 0;
-    }
-    node.children.forEach(squarify);
   }
 
   // Recursively resizes the specified node's children into existing rows.
   // Preserves the existing layout!
   function stickify(node) {
-    if (!node.children) return;
-    var rect = pad(node),
-        children = node.children.slice(), // copy-on-write
-        child,
-        row = [];
-    scale(children, rect.dx * rect.dy / node.value);
-    row.area = 0;
-    while (child = children.pop()) {
-      row.push(child);
-      row.area += child.area;
-      if (child.z != null) {
-        position(row, child.z ? rect.dx : rect.dy, rect, !children.length);
-        row.length = row.area = 0;
+    var children = node.children;
+    if (children && children.length) {
+      var rect = pad(node),
+          remaining = children.slice(), // copy-on-write
+          child,
+          row = [];
+      scale(remaining, rect.dx * rect.dy / node.value);
+      row.area = 0;
+      while (child = remaining.pop()) {
+        row.push(child);
+        row.area += child.area;
+        if (child.z != null) {
+          position(row, child.z ? rect.dx : rect.dy, rect, !remaining.length);
+          row.length = row.area = 0;
+        }
       }
+      children.forEach(stickify);
     }
-    node.children.forEach(stickify);
   }
 
   // Computes the score for the specified row, as the worst aspect ratio.