From f4bccfa54ba5158d00f866d4265a04cb049f7dbd Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Fri, 19 Jun 2026 18:30:28 +0100
Subject: Generate Java types for enum

---
 examples/07-enum/hobgoblin.json5                   |  9 +++++
 examples/07-enum/output/java/.gitignore            |  2 +
 examples/07-enum/output/java/pom.xml               | 47 ++++++++++++++++++++++
 .../src/main/java/org/zwobble/example/Main.java    |  9 +++++
 examples/07-enum/src/numbers.hob                   |  6 +++
 .../generators/javatypes/JavaTypesGenerator.java   | 23 ++++++++++-
 6 files changed, 94 insertions(+), 2 deletions(-)
 create mode 100644 examples/07-enum/hobgoblin.json5
 create mode 100644 examples/07-enum/output/java/.gitignore
 create mode 100644 examples/07-enum/output/java/pom.xml
 create mode 100644 examples/07-enum/output/java/src/main/java/org/zwobble/example/Main.java
 create mode 100644 examples/07-enum/src/numbers.hob

diff --git a/examples/07-enum/hobgoblin.json5 b/examples/07-enum/hobgoblin.json5
new file mode 100644
index 0000000..1ec9568
--- /dev/null
+++ b/examples/07-enum/hobgoblin.json5
@@ -0,0 +1,9 @@
+{
+  outputs: [
+    {
+      generator: "java-types",
+      path: "output/java/src/gen/java",
+      packageName: "org.zwobble.example.types"
+    },
+  ],
+}
diff --git a/examples/07-enum/output/java/.gitignore b/examples/07-enum/output/java/.gitignore
new file mode 100644
index 0000000..ff511d4
--- /dev/null
+++ b/examples/07-enum/output/java/.gitignore
@@ -0,0 +1,2 @@
+/src/gen/
+/target/
diff --git a/examples/07-enum/output/java/pom.xml b/examples/07-enum/output/java/pom.xml
new file mode 100644
index 0000000..506947e
--- /dev/null
+++ b/examples/07-enum/output/java/pom.xml
@@ -0,0 +1,47 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>org.zwobble.hobgoblin.examples</groupId>
+  <artifactId>example</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <maven.compiler.source>25</maven.compiler.source>
+    <maven.compiler.target>25</maven.compiler.target>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.zwobble.precisely</groupId>
+      <artifactId>precisely</artifactId>
+      <version>0.1.5</version>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>build-helper-maven-plugin</artifactId>
+        <version>3.6.1</version>
+        <executions>
+          <execution>
+            <id>add-source</id>
+            <phase>generate-sources</phase>
+            <goals>
+              <goal>add-source</goal>
+            </goals>
+            <configuration>
+              <sources>
+                <source>src/gen/java</source>
+              </sources>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>
diff --git a/examples/07-enum/output/java/src/main/java/org/zwobble/example/Main.java b/examples/07-enum/output/java/src/main/java/org/zwobble/example/Main.java
new file mode 100644
index 0000000..022cef1
--- /dev/null
+++ b/examples/07-enum/output/java/src/main/java/org/zwobble/example/Main.java
@@ -0,0 +1,9 @@
+package org.zwobble.example;
+
+import org.zwobble.example.types.numbers.SmallNumber;
+
+public class Main {
+    public static void main() {
+        SmallNumber smallNumber = SmallNumber.one;
+    }
+}
diff --git a/examples/07-enum/src/numbers.hob b/examples/07-enum/src/numbers.hob
new file mode 100644
index 0000000..125082d
--- /dev/null
+++ b/examples/07-enum/src/numbers.hob
@@ -0,0 +1,6 @@
+/// A small number.
+enum SmallNumber {
+    variant zero;
+    variant one;
+    variant two;
+}
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java
index a0f92ce..4001b01 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java
@@ -65,8 +65,13 @@ public class JavaTypesGenerator implements Generator {
 
         for (var statement : namespace.body()) {
             switch (statement) {
-                case TypedEnumDefinitionNode enumDefinitionNode -> {
-                    throw new UnsupportedOperationException("TODO");
+                case TypedEnumDefinitionNode enumDefinition -> {
+                    var javaCompilationUnit = new JavaCompilationUnit(
+                        packageParts,
+                        generateEnumDefinition(enumDefinition, context)
+                    );
+
+                    javaCompilationUnits.add(javaCompilationUnit);
                 }
 
                 case TypedNativeTypeDefinitionNode nativeTypeDefinition -> {
@@ -95,6 +100,20 @@ public class JavaTypesGenerator implements Generator {
         return javaCompilationUnits;
     }
 
+    private JavaTypeDeclaration generateEnumDefinition(
+        TypedEnumDefinitionNode enumDefinition,
+        Context context
+    ) {
+        return new JavaEnumDeclaration(
+            enumDefinition.name(),
+            enumDefinition.variants().stream()
+                .map(variant -> new JavaEnumConstant(variant.name()))
+                .toList(),
+            JavaCustomArea.forType(generateTypeRef(enumDefinition.type(), context), "body"),
+            enumDefinition.docComment()
+        );
+    }
+
     private JavaRecordDeclaration generateStructDefinition(
         TypedStructDefinitionNode structDefinition,
         Context context
-- 
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