From 4e8d3aa3f1ec9372e97098d0c247ef104edfb012 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Mon, 18 May 2026 23:48:33 +0100
Subject: Add build method to builders

---
 .../output/generators/javatypes/JavaTypesGenerator.java    | 14 +++++++++++++-
 .../hobgoblin/compiler/output/lang/java/JavaWriter.java    |  8 ++++++++
 .../compiler/output/lang/java/ast/JavaExpression.java      |  2 +-
 .../hobgoblin/compiler/output/lang/java/ast/JavaRef.java   |  4 ++++
 .../compiler/output/lang/java/JavaWriterTests.java         |  9 +++++++++
 5 files changed, 35 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaRef.java

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 2efd1ec..92c60d4 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
@@ -123,7 +123,19 @@ public class JavaTypesGenerator implements Generator {
                     "Builder",
                     components,
                     List.of(),
-                    List.of(),
+                    List.of(
+                        new JavaMethodDeclaration(
+                            "build",
+                            generateTypeRef(structDefinition.type()),
+                            List.of(),
+                            new JavaBlock(List.of(
+                                new JavaReturn(new JavaNewExpression(
+                                    generateTypeRef(structDefinition.type()),
+                                    components.stream().<JavaExpression>map(component -> new JavaRef(component.name())).toList()
+                                ))
+                            ))
+                        )
+                    ),
                     DocComment.EMPTY
                 )
             ),
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 87b1aa6..9707ab5 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
@@ -112,6 +112,10 @@ public class JavaWriter implements AutoCloseable {
             case JavaNewExpression newExpression -> {
                 writeNewExpression(newExpression);
             }
+
+            case JavaRef ref -> {
+                writeRef(ref);
+            }
         }
     }
 
@@ -229,6 +233,10 @@ public class JavaWriter implements AutoCloseable {
         this.writer.write("}");
     }
 
+    private void writeRef(JavaRef ref) throws IOException {
+        this.writer.write(ref.name());
+    }
+
     private void writeReturnStatement(JavaReturn returnStatement) throws IOException {
         this.writer.write("return ");
         writeExpression(returnStatement.value());
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaExpression.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaExpression.java
index e90fe4e..03d54dd 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaExpression.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaExpression.java
@@ -1,4 +1,4 @@
 package org.zwobble.hobgoblin.compiler.output.lang.java.ast;
 
-public sealed interface JavaExpression permits JavaIntegerLiteral, JavaNewExpression {
+public sealed interface JavaExpression permits JavaIntegerLiteral, JavaNewExpression, JavaRef {
 }
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaRef.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaRef.java
new file mode 100644
index 0000000..0ccc05c
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaRef.java
@@ -0,0 +1,4 @@
+package org.zwobble.hobgoblin.compiler.output.lang.java.ast;
+
+public record JavaRef(String name) implements JavaExpression {
+}
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 833b88a..531a7ff 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
@@ -304,6 +304,15 @@ public class JavaWriterTests {
         assertThat(string, equalTo("new one.Two(1, 2)"));
     }
 
+    @Test
+    public void ref() throws IOException {
+        var java = new JavaRef("x");
+
+        var string = write(writer -> writer.writeExpression(java));
+
+        assertThat(string, equalTo("x"));
+    }
+
     @Test
     public void typeRefWithoutArgsHasNoAngleBrackets() throws IOException {
         var java = JavaTypeRef.topLevel(List.of("abc", "def"), "One");
-- 
cgit v1.2.3