From a1b78ec441aea70ae7494ca2b2925720d3f4ab3c Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Fri, 12 Jun 2026 16:19:50 +0100
Subject: Add Java constructor

---
 .../compiler/output/lang/java/JavaWriter.java      | 35 +++++++++++++++++++++-
 .../lang/java/ast/JavaClassBodyDeclaration.java    |  2 +-
 .../lang/java/ast/JavaConstructorDeclaration.java  | 11 +++++++
 3 files changed, 46 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaConstructorDeclaration.java

(limited to 'src/main/java/org/zwobble')

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 baed6d4..bcb2778 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
@@ -114,8 +114,12 @@ public class JavaWriter implements AutoCloseable {
         this.writer.write("}");
     }
 
-    private void writeClassBodyDeclaration(JavaClassBodyDeclaration bodyDeclaration) throws IOException {
+    void writeClassBodyDeclaration(JavaClassBodyDeclaration bodyDeclaration) throws IOException {
         switch (bodyDeclaration) {
+            case JavaConstructorDeclaration constructorDeclaration -> {
+                writeConstructorDeclaration(constructorDeclaration);
+            }
+
             case JavaMethodDeclaration methodDeclaration -> {
                 writeMethodDeclaration(methodDeclaration);
             }
@@ -126,6 +130,35 @@ public class JavaWriter implements AutoCloseable {
         }
     }
 
+    void writeConstructorDeclaration(JavaConstructorDeclaration constructor) throws IOException {
+        writeVisibility(constructor.visibility());
+        this.writer.write(" ");
+        this.writer.write(constructor.typeName());
+        this.writer.write("(");
+
+        writeWithSeparator(
+            constructor.params(),
+            param -> {
+                writeTypeRef(param.type());
+                writer.write(" ");
+                writer.write(param.name());
+            },
+            () -> writer.write(", ")
+        );
+
+        this.writer.write(")");
+
+        this.writer.write(" {");
+        this.writer.indent();
+        if (!constructor.body().isEmpty()) {
+            this.writer.newLine();
+            writeBlock(constructor.body());
+        }
+        this.writer.dedent();
+        this.writer.newLine();
+        this.writer.write("}");
+    }
+
     private void writeCustomArea(JavaCustomArea customArea) throws IOException {
         var customAreaName = new StringWriter();
         writeTypeRef(customArea.type(), customAreaName::write);
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaClassBodyDeclaration.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaClassBodyDeclaration.java
index ee2a3a7..3bee614 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaClassBodyDeclaration.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaClassBodyDeclaration.java
@@ -1,4 +1,4 @@
 package org.zwobble.hobgoblin.compiler.output.lang.java.ast;
 
-public sealed interface JavaClassBodyDeclaration permits JavaMethodDeclaration, JavaTypeDeclaration {
+public sealed interface JavaClassBodyDeclaration permits JavaConstructorDeclaration, JavaMethodDeclaration, JavaTypeDeclaration {
 }
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaConstructorDeclaration.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaConstructorDeclaration.java
new file mode 100644
index 0000000..a6799f8
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaConstructorDeclaration.java
@@ -0,0 +1,11 @@
+package org.zwobble.hobgoblin.compiler.output.lang.java.ast;
+
+import java.util.List;
+
+public record JavaConstructorDeclaration(
+    String typeName,
+    JavaVisibility visibility,
+    List<JavaParam> params,
+    JavaBlock body
+) implements JavaClassBodyDeclaration {
+}
-- 
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