Fixup Enum Generator

Summary:
https://github.com/facebook/yoga/pull/1116 adds a new enum. The enum generator is out of date with copyright header, and some codemods, but it also looks like there were manual changes, types added, etc since generation. I fixed up the script to incorporate generating the changes folks made manually, and also added an enum that was previously only added manually to the C ABI.

Changelog:
[General][Fixed] - Fixup Yoga Enum Generator

Reviewed By: yungsters

Differential Revision: D39922252

fbshipit-source-id: b678fa9a43a896873d8c434745bdaf3f16fd991f

yoga/YGEnums.cpp

@@ -5,6 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+// @generated by enums.py
+
 #include "YGEnums.h"
 
 const char* YGAlignToString(const YGAlign value) {

yoga/YGEnums.h

@@ -5,53 +5,13 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+// @generated by enums.py
+
 #pragma once
+// clang-format: off
 
 #include "YGMacros.h"
 
-#ifdef __cplusplus
-namespace facebook {
-namespace yoga {
-namespace enums {
-
-template <typename T>
-constexpr int count(); // can't use `= delete` due to a defect in clang < 3.9
-
-namespace detail {
-template <int... xs>
-constexpr int n() {
-  return sizeof...(xs);
-}
-} // namespace detail
-
-} // namespace enums
-} // namespace yoga
-} // namespace facebook
-#endif
-
-#define YG_ENUM_DECL(NAME, ...)                               \
-  typedef YG_ENUM_BEGIN(NAME){__VA_ARGS__} YG_ENUM_END(NAME); \
-  WIN_EXPORT const char* NAME##ToString(NAME);
-
-#ifdef __cplusplus
-#define YG_ENUM_SEQ_DECL(NAME, ...)  \
-  YG_ENUM_DECL(NAME, __VA_ARGS__)    \
-  YG_EXTERN_C_END                    \
-  namespace facebook {               \
-  namespace yoga {                   \
-  namespace enums {                  \
-  template <>                        \
-  constexpr int count<NAME>() {      \
-    return detail::n<__VA_ARGS__>(); \
-  }                                  \
-  }                                  \
-  }                                  \
-  }                                  \
-  YG_EXTERN_C_BEGIN
-#else
-#define YG_ENUM_SEQ_DECL YG_ENUM_DECL
-#endif
-
 YG_EXTERN_C_BEGIN
 
 YG_ENUM_SEQ_DECL(
@@ -63,9 +23,12 @@ YG_ENUM_SEQ_DECL(
     YGAlignStretch,
     YGAlignBaseline,
     YGAlignSpaceBetween,
-    YGAlignSpaceAround);
+    YGAlignSpaceAround)
 
-YG_ENUM_SEQ_DECL(YGDimension, YGDimensionWidth, YGDimensionHeight)
+YG_ENUM_SEQ_DECL(
+    YGDimension,
+    YGDimensionWidth,
+    YGDimensionHeight)
 
 YG_ENUM_SEQ_DECL(
     YGDirection,
@@ -73,7 +36,10 @@ YG_ENUM_SEQ_DECL(
     YGDirectionLTR,
     YGDirectionRTL)
 
-YG_ENUM_SEQ_DECL(YGDisplay, YGDisplayFlex, YGDisplayNone)
+YG_ENUM_SEQ_DECL(
+    YGDisplay,
+    YGDisplayFlex,
+    YGDisplayNone)
 
 YG_ENUM_SEQ_DECL(
     YGEdge,
@@ -87,7 +53,9 @@ YG_ENUM_SEQ_DECL(
     YGEdgeVertical,
     YGEdgeAll)
 
-YG_ENUM_SEQ_DECL(YGExperimentalFeature, YGExperimentalFeatureWebFlexBasis)
+YG_ENUM_SEQ_DECL(
+    YGExperimentalFeature,
+    YGExperimentalFeatureWebFlexBasis)
 
 YG_ENUM_SEQ_DECL(
     YGFlexDirection,
@@ -120,7 +88,10 @@ YG_ENUM_SEQ_DECL(
     YGMeasureModeExactly,
     YGMeasureModeAtMost)
 
-YG_ENUM_SEQ_DECL(YGNodeType, YGNodeTypeDefault, YGNodeTypeText)
+YG_ENUM_SEQ_DECL(
+    YGNodeType,
+    YGNodeTypeDefault,
+    YGNodeTypeText)
 
 YG_ENUM_SEQ_DECL(
     YGOverflow,
@@ -147,9 +118,10 @@ YG_ENUM_SEQ_DECL(
     YGUnitPercent,
     YGUnitAuto)
 
-YG_ENUM_SEQ_DECL(YGWrap, YGWrapNoWrap, YGWrapWrap, YGWrapWrapReverse)
+YG_ENUM_SEQ_DECL(
+    YGWrap,
+    YGWrapNoWrap,
+    YGWrapWrap,
+    YGWrapWrapReverse)
 
 YG_EXTERN_C_END
-
-#undef YG_ENUM_DECL
-#undef YG_ENUM_SEQ_DECL

yoga/YGMacros.h

@@ -40,6 +40,49 @@
 #define YG_ENUM_END(name) name
 #endif
 
+#ifdef __cplusplus
+namespace facebook {
+namespace yoga {
+namespace enums {
+
+template <typename T>
+constexpr int count(); // can't use `= delete` due to a defect in clang < 3.9
+
+namespace detail {
+template <int... xs>
+constexpr int n() {
+  return sizeof...(xs);
+}
+} // namespace detail
+
+} // namespace enums
+} // namespace yoga
+} // namespace facebook
+#endif
+
+#define YG_ENUM_DECL(NAME, ...)                               \
+  typedef YG_ENUM_BEGIN(NAME){__VA_ARGS__} YG_ENUM_END(NAME); \
+  WIN_EXPORT const char* NAME##ToString(NAME);
+
+#ifdef __cplusplus
+#define YG_ENUM_SEQ_DECL(NAME, ...)  \
+  YG_ENUM_DECL(NAME, __VA_ARGS__)    \
+  YG_EXTERN_C_END                    \
+  namespace facebook {               \
+  namespace yoga {                   \
+  namespace enums {                  \
+  template <>                        \
+  constexpr int count<NAME>() {      \
+    return detail::n<__VA_ARGS__>(); \
+  }                                  \
+  }                                  \
+  }                                  \
+  }                                  \
+  YG_EXTERN_C_BEGIN
+#else
+#define YG_ENUM_SEQ_DECL YG_ENUM_DECL
+#endif
+
 #ifdef __GNUC__
 #define YG_DEPRECATED __attribute__((deprecated))
 #elif defined(_MSC_VER)