Add Java null literal

4 files changed, 22 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 87da849..d7a5325 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
@@ -148,6 +148,10 @@ public class JavaWriter implements AutoCloseable {
                 writeNewExpression(newExpression);
             }
 
+            case JavaNullLiteral nullLiteral -> {
+                writeNullLiteral(null);
+            }
+
             case JavaRef ref -> {
                 writeRef(ref);
             }
@@ -284,6 +288,10 @@ public class JavaWriter implements AutoCloseable {
         this.writer.write(")");
     }
 
+    private void writeNullLiteral(JavaNullLiteral nullLiteral) throws IOException {
+        this.writer.write("null");
+    }
+
     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 a8cb596..bbc087d 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, JavaMethodCall, JavaNewExpression, JavaRef, JavaStaticMethodCall, JavaStringLiteral {
+public sealed interface JavaExpression permits JavaIntegerLiteral, JavaMethodCall, JavaNewExpression, JavaNullLiteral, JavaRef, JavaStaticMethodCall, JavaStringLiteral {
 }
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaNullLiteral.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaNullLiteral.java
new file mode 100644
index 0000000..3ce68eb
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaNullLiteral.java
@@ -0,0 +1,4 @@
+package org.zwobble.hobgoblin.compiler.output.lang.java.ast;
+
+public record JavaNullLiteral() 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 53a3e65..65fa2a7 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
@@ -559,6 +559,15 @@ public class JavaWriterTests {
     }
 
     @Test
+    public void nullLiteral() throws IOException {
+        var java = new JavaNullLiteral();
+
+        var string = write(writer -> writer.writeExpression(java));
+
+        assertThat(string, equalTo("null"));
+    }
+
+    @Test
     public void stringLiteral() throws IOException {
         var java = new JavaStringLiteral("hello");