Support writing empty Java class declarations

4 files changed, 34 insertions, 1 deletions

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriter.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriter.java
index 59de6b7..0b56fa6 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriter.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriter.java
@@ -29,6 +29,10 @@ public class JavaWriter implements AutoCloseable {
 
     void writeTypeDeclaration(JavaTypeDeclaration typeDeclaration) throws IOException {
         switch (typeDeclaration) {
+            case JavaClassDeclaration classDeclaration -> {
+                writeClassDeclaration(classDeclaration);
+            }
+
             case JavaInterfaceDeclaration interfaceDeclaration -> {
                 writeInterfaceDeclaration(interfaceDeclaration);
             }
@@ -39,6 +43,15 @@ public class JavaWriter implements AutoCloseable {
         }
     }
 
+    private void writeClassDeclaration(JavaClassDeclaration classDeclaration) throws IOException {
+        this.writer.write("public class ");
+        this.writer.write(classDeclaration.name());
+        this.writer.write(" {");
+        this.writer.newLine();
+        this.writer.write("}");
+        this.writer.newLine();
+    }
+
     private void writeInterfaceDeclaration(JavaInterfaceDeclaration interfaceDeclaration) throws IOException {
         this.writer.write("public sealed interface ");
         this.writer.write(interfaceDeclaration.name());
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaClassDeclaration.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaClassDeclaration.java
new file mode 100644
index 0000000..6ca6a26
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaClassDeclaration.java
@@ -0,0 +1,4 @@
+package org.zwobble.hobgoblin.compiler.output.lang.java.ast;
+
+public record JavaClassDeclaration(String name) implements JavaTypeDeclaration {
+}
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaTypeDeclaration.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaTypeDeclaration.java
index 5cf5161..da6481e 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaTypeDeclaration.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaTypeDeclaration.java
@@ -1,5 +1,5 @@
 package org.zwobble.hobgoblin.compiler.output.lang.java.ast;
 
-public sealed interface JavaTypeDeclaration permits JavaInterfaceDeclaration, JavaRecordDeclaration {
+public sealed interface JavaTypeDeclaration permits JavaClassDeclaration, JavaInterfaceDeclaration, JavaRecordDeclaration {
     String name();
 }
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriterTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriterTests.java
index 0a614f4..13c2c00 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriterTests.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriterTests.java
@@ -2,6 +2,7 @@ package org.zwobble.hobgoblin.compiler.output.lang.java;
 
 import org.junit.jupiter.api.Test;
 import org.zwobble.hobgoblin.compiler.output.CodeWriter;
+import org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaClassDeclaration;
 import org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaInterfaceDeclaration;
 import org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaTypeRef;
 
@@ -14,6 +15,21 @@ import static org.zwobble.precisely.Matchers.equalTo;
 
 public class JavaWriterTests {
     @Test
+    public void emptyClassDeclaration() throws IOException {
+        var java = new JavaClassDeclaration(
+            "Rectangle"
+        );
+
+        var string = write(writer -> writer.writeTypeDeclaration(java));
+
+        assertThat(string, equalTo("""
+            public class Rectangle {
+            }
+            """
+        ));
+    }
+
+    @Test
     public void emptyInterfaceDeclaration() throws IOException {
         var java = new JavaInterfaceDeclaration(
             "Shape",