Remove the usage of YGUndefined in the default values of Border in YGStyle

Reviewed By: emilsjolander

Differential Revision: D7195115

fbshipit-source-id: e635cf55ac94d8a90caef6cafce281579da2cbfc

ReactCommon/yoga/yoga/Utils.cpp

@@ -49,3 +49,7 @@ bool YGFloatsEqual(const float a, const float b) {
   }
   return YGFloatIsUndefined(a) && YGFloatIsUndefined(b);
 }
+
+float YGFloatSanitize(const float& val) {
+  return YGFloatIsUndefined(val) ? 0 : val;
+}

ReactCommon/yoga/yoga/Utils.h

@@ -86,6 +86,9 @@ bool YGFloatArrayEqual(
   return areEqual;
 }
 
+// This function returns 0 if YGFloatIsUndefined(val) is true and val otherwise
+float YGFloatSanitize(const float& val);
+
 YGFlexDirection YGFlexDirectionCross(
     const YGFlexDirection flexDirection,
     const YGDirection direction);

ReactCommon/yoga/yoga/YGStyle.cpp

@@ -7,7 +7,7 @@
 
 #include "YGStyle.h"
 
-const YGValue kYGValueUndefined = {YGUndefined, YGUnitUndefined};
+const YGValue kYGValueUndefined = {0, YGUnitUndefined};
 
 const YGValue kYGValueAuto = {YGUndefined, YGUnitAuto};
 

ReactCommon/yoga/yoga/Yoga.cpp

@@ -760,7 +760,35 @@ YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL(YGValue, Position, position, position);
 YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL(YGValue, Margin, margin, margin);
 YG_NODE_STYLE_EDGE_PROPERTY_UNIT_AUTO_IMPL(YGValue, Margin, margin);
 YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL(YGValue, Padding, padding, padding);
-YG_NODE_STYLE_EDGE_PROPERTY_IMPL(float, Border, border, border);
+
+// TODO: Change the API to accept YGFloatOptional.
+void YGNodeStyleSetBorder(
+    const YGNodeRef node,
+    const YGEdge edge,
+    const float border) {
+  YGValue value = {
+      .value = YGFloatSanitize(border),
+      .unit = YGFloatIsUndefined(border) ? YGUnitUndefined : YGUnitPoint,
+  };
+  if ((node->getStyle().border[edge].value != value.value &&
+       value.unit != YGUnitUndefined) ||
+      node->getStyle().border[edge].unit != value.unit) {
+    YGStyle style = node->getStyle();
+    style.border[edge] = value;
+    node->setStyle(style);
+    node->markDirtyAndPropogate();
+  }
+}
+
+float YGNodeStyleGetBorder(const YGNodeRef node, const YGEdge edge) {
+  if (node->getStyle().border[edge].unit == YGUnitUndefined) {
+    // TODO: Rather than returning YGUndefined, change the api to return
+    // YGFloatOptional.
+    return YGUndefined;
+  }
+
+  return node->getStyle().border[edge].value;
+}
 
 YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL(YGValue, Width, width, dimensions[YGDimensionWidth]);
 YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL(YGValue, Height, height, dimensions[YGDimensionHeight]);

ReactCommon/yoga/yoga/Yoga.h

@@ -42,6 +42,11 @@ typedef struct YGValue {
   YGUnit unit;
 } YGValue;
 
+struct YGFloatOptional {
+  bool isUndefined;
+  float value;
+};
+
 extern const YGValue YGValueUndefined;
 extern const YGValue YGValueAuto;