From 701b6e6f87ccffabe315b299b6ec4965e4fd7c6f Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Mon, 18 May 2026 19:05:09 +0100
Subject: Add Java new expression

---
 .../hobgoblin/compiler/output/lang/java/JavaWriter.java  | 16 ++++++++++++++++
 .../compiler/output/lang/java/ast/JavaExpression.java    |  2 +-
 .../compiler/output/lang/java/ast/JavaNewExpression.java |  9 +++++++++
 .../compiler/output/lang/java/JavaWriterTests.java       | 12 ++++++++++++
 4 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaNewExpression.java

(limited to 'src')

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 1252777..87b1aa6 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
@@ -108,6 +108,10 @@ public class JavaWriter implements AutoCloseable {
             case JavaIntegerLiteral integerLiteral -> {
                 writeIntegerLiteral(integerLiteral);
             }
+
+            case JavaNewExpression newExpression -> {
+                writeNewExpression(newExpression);
+            }
         }
     }
 
@@ -167,6 +171,18 @@ public class JavaWriter implements AutoCloseable {
         this.writer.write("}");
     }
 
+    private void writeNewExpression(JavaNewExpression newExpression) throws IOException {
+        this.writer.write("new ");
+        writeTypeRef(newExpression.type());
+        this.writer.write("(");
+        writeWithSeparator(
+            newExpression.args(),
+            this::writeExpression,
+            () -> this.writer.write(", ")
+        );
+        this.writer.write(")");
+    }
+
     private void writeRecordDeclaration(JavaRecordDeclaration recordDeclaration) throws IOException {
         writeDocComment(recordDeclaration.docComment());
 
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 0aa202c..e90fe4e 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 {
+public sealed interface JavaExpression permits JavaIntegerLiteral, JavaNewExpression {
 }
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaNewExpression.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaNewExpression.java
new file mode 100644
index 0000000..b6852bf
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaNewExpression.java
@@ -0,0 +1,9 @@
+package org.zwobble.hobgoblin.compiler.output.lang.java.ast;
+
+import java.util.List;
+
+public record JavaNewExpression(
+    JavaTypeRef type,
+    List<JavaExpression> args
+) 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 abbbeea..833b88a 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
@@ -292,6 +292,18 @@ public class JavaWriterTests {
         assertThat(string, equalTo("42"));
     }
 
+    @Test
+    public void newExpression() throws IOException {
+        var java = new JavaNewExpression(
+            JavaTypeRef.topLevel(List.of("one"), "Two"),
+            List.of(new JavaIntegerLiteral(1), new JavaIntegerLiteral(2))
+        );
+
+        var string = write(writer -> writer.writeExpression(java));
+
+        assertThat(string, equalTo("new one.Two(1, 2)"));
+    }
+
     @Test
     public void typeRefWithoutArgsHasNoAngleBrackets() throws IOException {
         var java = JavaTypeRef.topLevel(List.of("abc", "def"), "One");
-- 
cgit v1.2.3