Add basic type checking for struct definitions

5 files changed, 66 insertions, 2 deletions

diff --git a/src/main/java/org/shedlang/compiler/ast/typed/TypedNamespaceStatementNode.java b/src/main/java/org/shedlang/compiler/ast/typed/TypedNamespaceStatementNode.java
index f2186711..9a5e766a 100644
--- a/src/main/java/org/shedlang/compiler/ast/typed/TypedNamespaceStatementNode.java
+++ b/src/main/java/org/shedlang/compiler/ast/typed/TypedNamespaceStatementNode.java
@@ -1,4 +1,4 @@
 package org.shedlang.compiler.ast.typed;
 
-public sealed interface TypedNamespaceStatementNode extends TypedNode permits TypedAssignNode, TypedFunctionDefinitionNode {
+public sealed interface TypedNamespaceStatementNode extends TypedNode permits TypedAssignNode, TypedFunctionDefinitionNode, TypedStructDefinitionNode {
 }
diff --git a/src/main/java/org/shedlang/compiler/ast/typed/TypedStructDefinitionNode.java b/src/main/java/org/shedlang/compiler/ast/typed/TypedStructDefinitionNode.java
new file mode 100644
index 00000000..4a956ee3
--- /dev/null
+++ b/src/main/java/org/shedlang/compiler/ast/typed/TypedStructDefinitionNode.java
@@ -0,0 +1,12 @@
+package org.shedlang.compiler.ast.typed;
+
+import org.shedlang.compiler.sources.Source;
+
+import java.util.List;
+
+public record TypedStructDefinitionNode(
+    String name,
+    List<TypedStructFieldDefinitionNode> fields,
+    Source source
+) implements TypedNamespaceStatementNode {
+}
diff --git a/src/main/java/org/shedlang/compiler/ast/typed/TypedStructFieldDefinitionNode.java b/src/main/java/org/shedlang/compiler/ast/typed/TypedStructFieldDefinitionNode.java
new file mode 100644
index 00000000..a84517a0
--- /dev/null
+++ b/src/main/java/org/shedlang/compiler/ast/typed/TypedStructFieldDefinitionNode.java
@@ -0,0 +1,11 @@
+package org.shedlang.compiler.ast.typed;
+
+import org.shedlang.compiler.sources.Source;
+import org.shedlang.compiler.types.Type;
+
+public record TypedStructFieldDefinitionNode(
+    String name,
+    TypedTypeLevelExpressionNode<Type> type,
+    Source source
+) implements TypedNode {
+}
diff --git a/src/main/java/org/shedlang/compiler/ast/untyped/UntypedStructDefinitionNode.java b/src/main/java/org/shedlang/compiler/ast/untyped/UntypedStructDefinitionNode.java
index 49490b8d..210c29ee 100644
--- a/src/main/java/org/shedlang/compiler/ast/untyped/UntypedStructDefinitionNode.java
+++ b/src/main/java/org/shedlang/compiler/ast/untyped/UntypedStructDefinitionNode.java
@@ -1,6 +1,9 @@
 package org.shedlang.compiler.ast.untyped;
 
+import org.pcollections.PVector;
 import org.shedlang.compiler.sources.Source;
+import org.shedlang.compiler.sources.Sources;
+import org.shedlang.compiler.util.P;
 
 import java.util.List;
 
@@ -9,4 +12,27 @@ public record UntypedStructDefinitionNode(
     List<UntypedStructFieldDefinitionNode> fields,
     Source source
 ) implements UntypedNamespaceStatementNode {
+    public static Builder builder() {
+        return new Builder("X", P.vector());
+    }
+
+    public record Builder(
+        String name,
+        PVector<UntypedStructFieldDefinitionNode> fields
+    ) {
+        public UntypedStructDefinitionNode build() {
+            return new UntypedStructDefinitionNode(
+                this.name,
+                this.fields,
+                Sources.NULL
+            );
+        }
+
+        public Builder withName(String name) {
+            return new Builder(
+                name,
+                this.fields
+            );
+        }
+    }
 }
diff --git a/src/main/java/org/shedlang/compiler/typechecker/TypeChecker.java b/src/main/java/org/shedlang/compiler/typechecker/TypeChecker.java
index 930efd85..5af83d5f 100644
--- a/src/main/java/org/shedlang/compiler/typechecker/TypeChecker.java
+++ b/src/main/java/org/shedlang/compiler/typechecker/TypeChecker.java
@@ -728,7 +728,7 @@ public class TypeChecker {
                 typeCheckStepsFunctionDefinition(functionDefinition);
 
             case UntypedStructDefinitionNode structDefinition ->
-                throw new UnsupportedOperationException("TODO");
+                typeCheckStepsStructDefinition(structDefinition);
         };
     }
 
@@ -781,6 +781,21 @@ public class TypeChecker {
         ));
     }
 
+    private static TypeCheckSteps<TypedStructDefinitionNode> typeCheckStepsStructDefinition(
+        UntypedStructDefinitionNode untyped
+    ) {
+        return new TypeCheckSteps<TypedStructDefinitionNode>() {
+            @Override
+            public TypeCheckerResult<TypedStructDefinitionNode> define(TypeCheckerContext context) {
+                return context.toResult(new TypedStructDefinitionNode(
+                    untyped.name(),
+                    List.of(),
+                    untyped.source()
+                ));
+            }
+        };
+    }
+
     @SuppressWarnings("unchecked")
     static <T extends TypeLevelValue> TypedTypeLevelExpressionNode<T> typeCheckTypeLevelExpression(
         TypeSetTypeLevelValue<T> valueType,