From 4597388e4b771585f7be32d9f0995bdbedf04c11 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Fri, 20 Mar 2026 19:27:37 +0000
Subject: Add initial skeleton for Protobuf serialisation

---
 .../compiler/patio/protobuf/PatioToProtobuf.java   | 83 ++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 src/main/java/org/shedlang/compiler/patio/protobuf/PatioToProtobuf.java

(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
new file mode 100644
index 00000000..c95e924a
--- /dev/null
+++ b/src/main/java/org/shedlang/compiler/patio/protobuf/PatioToProtobuf.java
@@ -0,0 +1,83 @@
+package org.shedlang.compiler.patio.protobuf;
+
+import org.shedlang.compiler.patio.*;
+
+public class PatioToProtobuf {
+    public PatioProtobuf.PatioCompilationUnit compilationUnitToProtobuf(
+        PatioCompilationUnit compilationUnit
+    ) {
+        var builder = PatioProtobuf.PatioCompilationUnit.newBuilder();
+        for (var element : compilationUnit.elements()) {
+            builder.addElements(compilationUnitElementToProtobuf(element));
+        }
+        return builder.build();
+    }
+
+    private PatioProtobuf.PatioCompilationUnitElement compilationUnitElementToProtobuf(
+        PatioCompilationUnitElement element
+    ) {
+        var builder = PatioProtobuf.PatioCompilationUnitElement.newBuilder();
+
+        switch (element) {
+            case PatioDataElementImmutableDefinition dataElementImmutableDefinition -> {
+                builder.setDataElementImmutableDefinition(
+                    dataElementImmutableDefinitionToProtobuf(dataElementImmutableDefinition)
+                );
+            }
+            case PatioDataElementMutableDeclaration dataElementMutableDeclaration -> {
+                builder.setDataElementMutableDeclaration(
+                    dataElementMutableDeclarationToProtobuf(dataElementMutableDeclaration)
+                );
+            }
+            case PatioDataElementMutableDefinition dataElementMutableDefinition -> {
+                builder.setDataElementMutableDefinition(
+                    dataElementMutableDefinitionToProtobuf(dataElementMutableDefinition)
+                );
+            }
+            case PatioExceptionTypeDefinition exceptionTypeDefinition -> {
+                throw new UnsupportedOperationException("TODO");
+            }
+            case PatioFunctionDeclaration functionDeclaration -> {
+                throw new UnsupportedOperationException("TODO");
+            }
+            case PatioFunctionDefinition functionDefinition -> {
+                throw new UnsupportedOperationException("TODO");
+            }
+        }
+
+        return builder.build();
+    }
+
+    private PatioProtobuf.PatioDataElementImmutableDefinition dataElementImmutableDefinitionToProtobuf(
+        PatioDataElementImmutableDefinition element
+    ) {
+        var builder = PatioProtobuf.PatioDataElementImmutableDefinition.newBuilder();
+        builder.setName(element.name());
+        builder.setVisibility(visibilityToProtobuf(element.visibility()));
+        return builder.build();
+    }
+
+    private PatioProtobuf.PatioDataElementMutableDeclaration dataElementMutableDeclarationToProtobuf(
+        PatioDataElementMutableDeclaration element
+    ) {
+        var builder = PatioProtobuf.PatioDataElementMutableDeclaration.newBuilder();
+        builder.setName(element.name());
+        return builder.build();
+    }
+
+    private PatioProtobuf.PatioDataElementMutableDefinition dataElementMutableDefinitionToProtobuf(
+        PatioDataElementMutableDefinition element
+    ) {
+        var builder = PatioProtobuf.PatioDataElementMutableDefinition.newBuilder();
+        builder.setName(element.name());
+        builder.setVisibility(visibilityToProtobuf(element.visibility()));
+        return builder.build();
+    }
+
+    private PatioProtobuf.PatioVisibility visibilityToProtobuf(PatioVisibility visibility) {
+        return switch (visibility) {
+            case PRIVATE -> PatioProtobuf.PatioVisibility.PRIVATE;
+            case PUBLIC -> PatioProtobuf.PatioVisibility.PUBLIC;
+        };
+    }
+}
-- 
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