Generate Kotlin files with enums.py (#1845)

Summary:
X-link: facebook/react-native#55631

This PR extends enums.py to also write Kotlin files. To introduce this in the least breaking manner, we can gradually do one by one and at the end clean up the Java script.

Migrate YogaDirection to Kotlin.

Changelog: [Internal]

Pull Request resolved: #1845

Test Plan:
RN
```sh
yarn android
yarn test-android
```

Yoga
```sh
./gradlew :yoga:assembleDebug
```

Reviewed By: cortinico

Differential Revision: D93555645

Pulled By: NickGerleman

fbshipit-source-id: cdddc9850f05cf0782cc4fdb782f22776ab12d31

Author: mateoguzmana

enums.py

@@ -84,6 +84,14 @@
     ],
 }
 
+# Temporary filter enums to not upgrade all enums at once
+KOTLIN_ENUM_NAMES = {"Direction"}
+
+ENUMS_KOTLIN = {name: ENUMS[name] for name in KOTLIN_ENUM_NAMES}
+ENUMS_JAVA = {
+    name: values for name, values in ENUMS.items() if name not in KOTLIN_ENUM_NAMES
+}
+
 DO_NOT_STRIP = ["LogLevel"]
 
 BITSET_ENUMS = ["Errata"]
@@ -120,6 +128,10 @@ def to_java_upper(symbol):
     return _format_name(symbol, "_", "upper")
 
 
+def to_kotlin_upper(symbol):
+    return _format_name(symbol, "_", "upper")
+
+
 def to_hyphenated_lower(symbol):
     return _format_name(symbol, "-", "lower")
 
@@ -215,7 +227,7 @@ def to_hyphenated_lower(symbol):
             f.write("\n")
 
 # write out java files
-for name, values in sorted(ENUMS.items()):
+for name, values in sorted(ENUMS_JAVA.items()):
     with open(root + "/java/com/facebook/yoga/Yoga%s.java" % name, "w") as f:
         f.write(get_license("java"))
         f.write("package com.facebook.yoga;\n\n")
@@ -267,6 +279,46 @@ def to_hyphenated_lower(symbol):
         f.write("  }\n")
         f.write("}\n")
 
+# write out Kotlin files
+for name, values in sorted(ENUMS_KOTLIN.items()):
+    with open(root + "/java/com/facebook/yoga/Yoga%s.kt" % name, "w") as f:
+        f.write(get_license("kotlin"))
+        f.write("package com.facebook.yoga\n\n")
+        f.write("public enum class Yoga%s(public val intValue: Int) {\n" % name)
+        if len(values) > 0:
+            for value in values:
+                if isinstance(value, tuple):
+                    f.write("  %s(%d)" % (to_kotlin_upper(value[0]), value[1]))
+                else:
+                    f.write("  %s(%d)" % (to_kotlin_upper(value), values.index(value)))
+                if values.index(value) is len(values) - 1:
+                    f.write(";\n")
+                else:
+                    f.write(",\n")
+        else:
+            f.write("__EMPTY(-1);")
+        f.write("\n")
+        f.write("  public fun intValue(): Int = intValue\n")
+        f.write("\n")
+        f.write("  public companion object {\n")
+        f.write("    @JvmStatic\n")
+        f.write("    public fun fromInt(value: Int): Yoga%s =\n" % name)
+        f.write("        when (value) {\n")
+        for value in values:
+            if isinstance(value, tuple):
+                f.write("          %d -> %s\n" % (value[1], to_kotlin_upper(value[0])))
+            else:
+                f.write(
+                    "          %d -> %s\n"
+                    % (values.index(value), to_kotlin_upper(value))
+                )
+        f.write(
+            '          else -> throw IllegalArgumentException("Unknown enum value: $value")\n'
+        )
+        f.write("        }\n")
+        f.write("  }\n")
+        f.write("}\n")
+
 # write out TypeScript file
 with open(root + "/javascript/src/generated/YGEnums.ts", "w") as f:
     f.write(get_license("js"))

java/com/facebook/yoga/YogaDirection.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// @generated by enums.py
+
+package com.facebook.yoga
+
+public enum class YogaDirection(public val intValue: Int) {
+  INHERIT(0),
+  LTR(1),
+  RTL(2);
+
+  public fun intValue(): Int = intValue
+
+  public companion object {
+    @JvmStatic
+    public fun fromInt(value: Int): YogaDirection =
+        when (value) {
+          0 -> INHERIT
+          1 -> LTR
+          2 -> RTL
+          else -> throw IllegalArgumentException("Unknown enum value: $value")
+        }
+  }
+}