From 6b4d2a11537282947dc71a646c168ea1343d6a52 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 1 Aug 2026 09:24:12 +0100
Subject: Support Box in transient-0

---
 .../javatransient0/JavaTransient0Generator.java    |  8 +++++--
 .../rusttransient0/RustTransient0Generator.java    | 26 ++++++++++++++++++++--
 2 files changed, 30 insertions(+), 4 deletions(-)

(limited to 'src/main/java')

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatransient0/JavaTransient0Generator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatransient0/JavaTransient0Generator.java
index dd81f99..e27c606 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatransient0/JavaTransient0Generator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatransient0/JavaTransient0Generator.java
@@ -701,7 +701,9 @@ public class JavaTransient0Generator implements Generator {
     private List<JavaBlockStatement> generateEncode(JavaExpression value, Type type) {
         return switch (type) {
             case ConstructedNativeType constructedNativeType -> {
-                if (constructedNativeType.constructor().equals(NativeTypes.LIST)) {
+                if (constructedNativeType.constructor().equals(NativeTypes.BOX)) {
+                    yield generateEncode(value, constructedNativeType.args().getFirst());
+                } else if (constructedNativeType.constructor().equals(NativeTypes.LIST)) {
                     yield generateEncodeList(value, constructedNativeType.args().getFirst());
                 } else if (constructedNativeType.constructor().equals(NativeTypes.OPTION)) {
                     yield generateEncodeOption(value, constructedNativeType.args().getFirst());
@@ -775,7 +777,9 @@ public class JavaTransient0Generator implements Generator {
     private List<JavaBlockStatement> generateDecode(JavaIdentifier target, Type type) {
         return switch (type) {
             case ConstructedNativeType constructedNativeType -> {
-                if (constructedNativeType.constructor().equals(NativeTypes.LIST)) {
+                if (constructedNativeType.constructor().equals(NativeTypes.BOX)) {
+                    yield generateDecode(target, constructedNativeType.args().getFirst());
+                } else if (constructedNativeType.constructor().equals(NativeTypes.LIST)) {
                     yield generateDecodeList(target, constructedNativeType.args().getFirst());
                 } else if (constructedNativeType.constructor().equals(NativeTypes.OPTION)) {
                     yield generateDecodeOption(target, constructedNativeType.args().getFirst());
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java
index ea1949d..981e02b 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java
@@ -578,7 +578,9 @@ public class RustTransient0Generator implements Generator {
     private RustStatement generateEncode(RustExpression value, Type type) {
         return switch (type) {
             case ConstructedNativeType constructedNativeType -> {
-                if (constructedNativeType.constructor().equals(NativeTypes.LIST)) {
+                if (constructedNativeType.constructor().equals(NativeTypes.BOX)) {
+                    yield generateEncodeBox(value, constructedNativeType.args().getFirst());
+                } else if (constructedNativeType.constructor().equals(NativeTypes.LIST)) {
                     yield generateEncodeList(value, constructedNativeType.args().getFirst());
                 } else if (constructedNativeType.constructor().equals(NativeTypes.OPTION)) {
                     yield generateEncodeOption(value, constructedNativeType.args().getFirst());
@@ -618,7 +620,9 @@ public class RustTransient0Generator implements Generator {
     private RustExpression generateDecode(Type type) {
         return switch (type) {
             case ConstructedNativeType constructedNativeType -> {
-                if (constructedNativeType.constructor().equals(NativeTypes.LIST)) {
+                if (constructedNativeType.constructor().equals(NativeTypes.BOX)) {
+                    yield generateDecodeBox(constructedNativeType.args().getFirst());
+                } else if (constructedNativeType.constructor().equals(NativeTypes.LIST)) {
                     yield generateDecodeList(constructedNativeType.args().getFirst());
                 } else if (constructedNativeType.constructor().equals(NativeTypes.OPTION)) {
                     yield generateDecodeOption(constructedNativeType.args().getFirst());
@@ -685,6 +689,24 @@ public class RustTransient0Generator implements Generator {
         ));
     }
 
+    private RustStatement generateEncodeBox(RustExpression value, Type elementType) {
+        return generateEncode(
+            methodCall(
+                value,
+                RustIdentifier.of("as_ref"),
+                List.of()
+            ),
+            elementType
+        );
+    }
+
+    private RustExpression generateDecodeBox(Type elementType) {
+        return new RustCallExpression(
+            RustTypes.BOX.addSegment(RustPathSegment.of("new")),
+            List.of(generateDecode(elementType))
+        );
+    }
+
     private RustStatement generateEncodeList(RustExpression value, Type elementType) {
         var element = RustIdentifier.of("element");
 
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