From 364bfd15a9a62724a80ce27f09ec5e80a05dfcb1 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Mon, 27 Jul 2026 20:28:30 +0100
Subject: Add multiplication to Java AST

---
 .../hobgoblin/compiler/output/lang/java/JavaWriter.java     |  3 +++
 .../compiler/output/lang/java/ast/JavaBinaryOperator.java   |  1 +
 .../compiler/output/lang/java/JavaWriterTests.java          | 13 +++++++++++++
 3 files changed, 17 insertions(+)

(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 4e4d8e5..b593364 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
@@ -724,6 +724,7 @@ public class JavaWriter implements AutoCloseable {
             case LOGICAL_AND -> JavaPrecedence.LOGICAL_AND;
             case LEFT_SHIFT -> JavaPrecedence.SHIFT;
             case LESS_THAN -> JavaPrecedence.RELATIONAL;
+            case MULTIPLY -> JavaPrecedence.MULTIPLICATIVE;
             case NOT_EQUAL_TO -> JavaPrecedence.EQUALITY;
             case UNSIGNED_RIGHT_SHIFT -> JavaPrecedence.SHIFT;
         };
@@ -760,6 +761,7 @@ public class JavaWriter implements AutoCloseable {
             case LEFT_SHIFT -> "<<";
             case LESS_THAN -> "<";
             case LOGICAL_AND -> "&&";
+            case MULTIPLY -> "*";
             case NOT_EQUAL_TO -> "!=";
             case UNSIGNED_RIGHT_SHIFT -> ">>>";
         });
@@ -781,6 +783,7 @@ public class JavaWriter implements AutoCloseable {
             case LEFT_SHIFT -> true;
             case LESS_THAN -> true;
             case LOGICAL_AND -> true;
+            case MULTIPLY -> true;
             case NOT_EQUAL_TO -> true;
             case UNSIGNED_RIGHT_SHIFT -> true;
         };
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaBinaryOperator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaBinaryOperator.java
index 34d9d4e..e9c2a54 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaBinaryOperator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaBinaryOperator.java
@@ -11,6 +11,7 @@ public enum JavaBinaryOperator {
     BITWISE_AND,
     BITWISE_OR,
     EQUAL_TO,
+    MULTIPLY,
     LEFT_SHIFT,
     LESS_THAN,
     LOGICAL_AND,
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 80c145d..2889032 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
@@ -1387,6 +1387,19 @@ public class JavaWriterTests {
         assertThat(string, equalTo("x && y"));
     }
 
+    @Test
+    public void binaryOperationMultiply() throws IOException {
+        var java = new JavaBinaryOperation(
+            JavaBinaryOperator.MULTIPLY,
+            new JavaRef(JavaIdentifier.of("x")),
+            new JavaRef(JavaIdentifier.of("y"))
+        );
+
+        var string = write(writer -> writer.writeTopLevelExpression(java));
+
+        assertThat(string, equalTo("x * y"));
+    }
+
     @Test
     public void binaryOperationNotEqualTo() throws IOException {
         var java = new JavaBinaryOperation(
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