Add basic type checking for struct definitions

3 files changed, 90 insertions, 0 deletions

diff --git a/src/test/java/org/shedlang/compiler/ast/typed/TypedNodeMatchers.java b/src/test/java/org/shedlang/compiler/ast/typed/TypedNodeMatchers.java
index 52d91cdf..bc5da178 100644
--- a/src/test/java/org/shedlang/compiler/ast/typed/TypedNodeMatchers.java
+++ b/src/test/java/org/shedlang/compiler/ast/typed/TypedNodeMatchers.java
@@ -221,6 +221,10 @@ public class TypedNodeMatchers {
         );
     }
 
+    public static TypedStructDefinitionNodeMatcher isTypedStructDefinitionNode() {
+        return TypedStructDefinitionNodeMatcher.empty();
+    }
+
     public static Matcher<TypedTargetNode> isTypedTargetIgnore() {
         return instanceOf(TypedTargetNode.Ignore.class);
     }
diff --git a/src/test/java/org/shedlang/compiler/ast/typed/TypedStructDefinitionNodeMatcher.java b/src/test/java/org/shedlang/compiler/ast/typed/TypedStructDefinitionNodeMatcher.java
new file mode 100644
index 00000000..489fb558
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/ast/typed/TypedStructDefinitionNodeMatcher.java
@@ -0,0 +1,43 @@
+package org.shedlang.compiler.ast.typed;
+
+import org.pcollections.PVector;
+import org.shedlang.compiler.testing.MatcherBuilder;
+import org.shedlang.compiler.util.P;
+import org.zwobble.precisely.Matcher;
+
+import static org.zwobble.precisely.Matchers.equalTo;
+import static org.zwobble.precisely.Matchers.has;
+
+public class TypedStructDefinitionNodeMatcher extends MatcherBuilder<
+    TypedNamespaceStatementNode,
+    TypedStructDefinitionNode,
+    TypedStructDefinitionNodeMatcher
+> {
+    public static TypedStructDefinitionNodeMatcher empty() {
+        return new TypedStructDefinitionNodeMatcher(P.vector());
+    }
+
+    private TypedStructDefinitionNodeMatcher(PVector<Matcher<? super TypedStructDefinitionNode>> submatchers) {
+        super(submatchers);
+    }
+
+    @Override
+    protected Class<TypedStructDefinitionNode> expectedType() {
+        return TypedStructDefinitionNode.class;
+    }
+
+    @Override
+    protected TypedStructDefinitionNodeMatcher create(PVector<Matcher<? super TypedStructDefinitionNode>> submatchers) {
+        return new TypedStructDefinitionNodeMatcher(submatchers);
+    }
+
+    public TypedStructDefinitionNodeMatcher withName(String name) {
+        return with(has("name", x -> x.name(), equalTo(name)));
+    }
+
+    public TypedStructDefinitionNodeMatcher withFields(
+        Matcher<Iterable<? extends TypedStructFieldDefinitionNode>> fields
+    ) {
+        return with(has("fields", x -> x.fields(), fields));
+    }
+}
diff --git a/src/test/java/org/shedlang/compiler/typechecker/TypeCheckerStructDefinitionTests.java b/src/test/java/org/shedlang/compiler/typechecker/TypeCheckerStructDefinitionTests.java
new file mode 100644
index 00000000..ac361f79
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/typechecker/TypeCheckerStructDefinitionTests.java
@@ -0,0 +1,43 @@
+package org.shedlang.compiler.typechecker;
+
+import org.junit.jupiter.api.Test;
+import org.shedlang.compiler.ast.typed.TypedNamespaceStatementNode;
+import org.shedlang.compiler.ast.untyped.UntypedNamespaceStatementNode;
+import org.shedlang.compiler.ast.untyped.UntypedStructDefinitionNode;
+import org.shedlang.compiler.util.P;
+
+import static org.shedlang.compiler.ast.typed.TypedNodeMatchers.isTypedStructDefinitionNode;
+import static org.zwobble.precisely.AssertThat.assertThat;
+import static org.zwobble.precisely.Matchers.isSequence;
+
+public class TypeCheckerStructDefinitionTests {
+    @Test
+    public void canTypeCheckStructDefinitionWithNoFields() {
+        var untyped = UntypedStructDefinitionNode.builder()
+            .withName("ExampleStruct")
+            .build();
+        var context = TypeCheckerContext.EMPTY;
+
+        var typed = typeCheckNamespaceStatement(untyped, context);
+
+        assertThat(
+            typed.value(),
+            isTypedStructDefinitionNode()
+                .withName("ExampleStruct")
+                .withFields(isSequence())
+        );
+    }
+
+    private static TypeCheckerResult<? extends TypedNamespaceStatementNode> typeCheckNamespaceStatement(
+        UntypedNamespaceStatementNode untyped,
+        TypeCheckerContext context
+    ) {
+        // TODO: remove duplication of this method
+        var declaredVariables = DeclaredVariables.forNamespaceStatement(untyped, P.vector());
+        var environment = EnvironmentBuilder.EMPTY.addUndefined(declaredVariables);
+
+        context = context.enterNamespace(environment.build());
+
+        return TypeChecker.typeCheckNamespaceStatement(untyped).typeCheckAllPhases(context);
+    }
+}