From 1a92052dc7b1cbcf15f0b9f497942e397375d3b4 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 21 Mar 2026 17:34:56 +0000
Subject: Serialize Patio function definition to Protobuf

---
 .../compiler/patio/protobuf/PatioToProtobuf.java   | 48 +++++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

(limited to 'src/main/java')

diff --git a/src/main/java/org/shedlang/compiler/patio/protobuf/PatioToProtobuf.java b/src/main/java/org/shedlang/compiler/patio/protobuf/PatioToProtobuf.java
index 56cbc260..6a849beb 100644
--- a/src/main/java/org/shedlang/compiler/patio/protobuf/PatioToProtobuf.java
+++ b/src/main/java/org/shedlang/compiler/patio/protobuf/PatioToProtobuf.java
@@ -65,7 +65,9 @@ public class PatioToProtobuf {
                 );
             }
             case PatioFunctionDefinition functionDefinition -> {
-                throw new UnsupportedOperationException("TODO");
+                builder.setFunctionDefinition(
+                    serializeFunctionDefinition(functionDefinition, parentSource)
+                );
             }
         }
 
@@ -104,6 +106,12 @@ public class PatioToProtobuf {
                     parentSource
                 );
 
+            case FUNCTION_DEFINITION ->
+                deserializeFunctionDefinition(
+                    elementProtobuf.getFunctionDefinition(),
+                    parentSource
+                );
+
             case VALUE_NOT_SET ->
                 throw new UnsupportedOperationException("TODO");
         };
@@ -230,6 +238,44 @@ public class PatioToProtobuf {
         );
     }
 
+    private static PatioProtobuf.PatioFunctionDefinition serializeFunctionDefinition(
+        PatioFunctionDefinition functionDefinition,
+        Source parentSource
+    ) {
+        var builder = PatioProtobuf.PatioFunctionDefinition.newBuilder();
+        builder.setSource(serializeSource(functionDefinition.source(), parentSource));
+        builder.setName(functionDefinition.name());
+        builder.setVisibility(serializeVisibility(functionDefinition.visibility()));
+        for (var param : functionDefinition.locals()) {
+            builder.addLocals(serializeLocal(param));
+        }
+        builder.setReturnType(serializeType(functionDefinition.returnType()));
+        for (var bodyInstruction : functionDefinition.body()) {
+            builder.addBody(serializeInstruction(bodyInstruction, functionDefinition.source()));
+        }
+        return builder.build();
+    }
+
+    private static PatioFunctionDefinition deserializeFunctionDefinition(
+        PatioProtobuf.PatioFunctionDefinition functionDefinitionProtobuf,
+        Source parentSource
+    ) {
+        var source = deserializeSource(functionDefinitionProtobuf.getSource(), parentSource);
+
+        return new PatioFunctionDefinition(
+            functionDefinitionProtobuf.getName(),
+            deserializeVisibility(functionDefinitionProtobuf.getVisibility()),
+            functionDefinitionProtobuf.getLocalsList().stream()
+                .map(PatioToProtobuf::deserializeLocal)
+                .collect(Collectors.toList()),
+            deserializeType(functionDefinitionProtobuf.getReturnType()),
+            functionDefinitionProtobuf.getBodyList().stream()
+                .map(bodyInstructionProtobuf -> deserializeInstruction(bodyInstructionProtobuf, source))
+                .collect(Collectors.toList()),
+            source
+        );
+    }
+
     // == Locals ==
 
     private static PatioProtobuf.PatioLocal serializeLocal(PatioLocal local) {
-- 
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