Fix naming convetion:

- "Layout node" is changed to "layout spec".
- Update tests.
- Update Kittens sample.

AsyncDisplayKit/Private/ASStackLayoutSpecUtilities.h

@@ -0,0 +1,62 @@
+/*
+ *  Copyright (c) 2014-present, Facebook, Inc.
+ *  All rights reserved.
+ *
+ *  This source code is licensed under the BSD-style license found in the
+ *  LICENSE file in the root directory of this source tree. An additional grant
+ *  of patent rights can be found in the PATENTS file in the same directory.
+ *
+ */
+
+#import "ASStackLayoutSpec.h"
+
+inline CGFloat stackDimension(const ASStackLayoutDirection direction, const CGSize size)
+{
+  return (direction == ASStackLayoutDirectionVertical) ? size.height : size.width;
+}
+
+inline CGFloat crossDimension(const ASStackLayoutDirection direction, const CGSize size)
+{
+  return (direction == ASStackLayoutDirectionVertical) ? size.width : size.height;
+}
+
+inline BOOL compareCrossDimension(const ASStackLayoutDirection direction, const CGSize a, const CGSize b)
+{
+  return crossDimension(direction, a) < crossDimension(direction, b);
+}
+
+inline CGPoint directionPoint(const ASStackLayoutDirection direction, const CGFloat stack, const CGFloat cross)
+{
+  return (direction == ASStackLayoutDirectionVertical) ? CGPointMake(cross, stack) : CGPointMake(stack, cross);
+}
+
+inline CGSize directionSize(const ASStackLayoutDirection direction, const CGFloat stack, const CGFloat cross)
+{
+  return (direction == ASStackLayoutDirectionVertical) ? CGSizeMake(cross, stack) : CGSizeMake(stack, cross);
+}
+
+inline ASSizeRange directionSizeRange(const ASStackLayoutDirection direction,
+                                      const CGFloat stackMin,
+                                      const CGFloat stackMax,
+                                      const CGFloat crossMin,
+                                      const CGFloat crossMax)
+{
+  return {directionSize(direction, stackMin, crossMin), directionSize(direction, stackMax, crossMax)};
+}
+
+inline ASStackLayoutAlignItems alignment(ASStackLayoutAlignSelf childAlignment, ASStackLayoutAlignItems stackAlignment)
+{
+  switch (childAlignment) {
+    case ASStackLayoutAlignSelfCenter:
+      return ASStackLayoutAlignItemsCenter;
+    case ASStackLayoutAlignSelfEnd:
+      return ASStackLayoutAlignItemsEnd;
+    case ASStackLayoutAlignSelfStart:
+      return ASStackLayoutAlignItemsStart;
+    case ASStackLayoutAlignSelfStretch:
+      return ASStackLayoutAlignItemsStretch;
+    case ASStackLayoutAlignSelfAuto:
+    default:
+      return stackAlignment;
+  }
+}