From a0074f328bfabc0c28d7e5b1202761daaa265fc8 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Wed, 27 Sep 2023 20:22:34 +0100
Subject: Parse struct without fields

---
 .../compiler/ast/untyped/UntypedNodeMatchers.java  |  4 +++
 .../UntypedStructDefinitionNodeMatcher.java        | 37 ++++++++++++++++++++++
 .../parser/ParserStructDefinitionTests.java        | 26 +++++++++++++++
 3 files changed, 67 insertions(+)
 create mode 100644 src/test/java/org/shedlang/compiler/ast/untyped/UntypedStructDefinitionNodeMatcher.java
 create mode 100644 src/test/java/org/shedlang/compiler/parser/ParserStructDefinitionTests.java

(limited to 'src/test/java')

diff --git a/src/test/java/org/shedlang/compiler/ast/untyped/UntypedNodeMatchers.java b/src/test/java/org/shedlang/compiler/ast/untyped/UntypedNodeMatchers.java
index 0dac3b15..95d666cd 100644
--- a/src/test/java/org/shedlang/compiler/ast/untyped/UntypedNodeMatchers.java
+++ b/src/test/java/org/shedlang/compiler/ast/untyped/UntypedNodeMatchers.java
@@ -194,6 +194,10 @@ public class UntypedNodeMatchers {
         );
     }
 
+    public static UntypedStructDefinitionNodeMatcher isUntypedStructDefinitionNode() {
+        return UntypedStructDefinitionNodeMatcher.empty();
+    }
+
     public static Matcher<UntypedExpressionNode> isUntypedSubNode(
         Matcher<UntypedExpressionNode> left,
         Matcher<UntypedExpressionNode> right
diff --git a/src/test/java/org/shedlang/compiler/ast/untyped/UntypedStructDefinitionNodeMatcher.java b/src/test/java/org/shedlang/compiler/ast/untyped/UntypedStructDefinitionNodeMatcher.java
new file mode 100644
index 00000000..5a73f49b
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/ast/untyped/UntypedStructDefinitionNodeMatcher.java
@@ -0,0 +1,37 @@
+package org.shedlang.compiler.ast.untyped;
+
+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 UntypedStructDefinitionNodeMatcher extends MatcherBuilder<UntypedNamespaceStatementNode, UntypedStructDefinitionNode, UntypedStructDefinitionNodeMatcher> {
+    public static UntypedStructDefinitionNodeMatcher empty() {
+        return new UntypedStructDefinitionNodeMatcher(P.vector());
+    }
+
+    public UntypedStructDefinitionNodeMatcher(PVector<Matcher<? super UntypedStructDefinitionNode>> submatchers) {
+        super(submatchers);
+    }
+
+    @Override
+    protected Class<UntypedStructDefinitionNode> expectedType() {
+        return UntypedStructDefinitionNode.class;
+    }
+
+    @Override
+    protected UntypedStructDefinitionNodeMatcher create(PVector<Matcher<? super UntypedStructDefinitionNode>> submatchers) {
+        return new UntypedStructDefinitionNodeMatcher(submatchers);
+    }
+
+    public UntypedStructDefinitionNodeMatcher withName(String name) {
+        return with(has("name", x -> x.name(), equalTo(name)));
+    }
+
+    public UntypedStructDefinitionNodeMatcher withFields(Matcher<Iterable<? extends UntypedStructFieldDefinitionNode>> fields) {
+        return with(has("fields", x -> x.fields(), fields));
+    }
+}
diff --git a/src/test/java/org/shedlang/compiler/parser/ParserStructDefinitionTests.java b/src/test/java/org/shedlang/compiler/parser/ParserStructDefinitionTests.java
new file mode 100644
index 00000000..8a0fe6b6
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/parser/ParserStructDefinitionTests.java
@@ -0,0 +1,26 @@
+package org.shedlang.compiler.parser;
+
+import org.junit.jupiter.api.Test;
+
+import static org.shedlang.compiler.ast.untyped.UntypedNodeMatchers.isUntypedStructDefinitionNode;
+import static org.shedlang.compiler.parser.ParserTesting.parseString;
+import static org.zwobble.precisely.AssertThat.assertThat;
+import static org.zwobble.precisely.Matchers.isSequence;
+
+public class ParserStructDefinitionTests {
+    @Test
+    public void canParseStructWithNoFields() {
+        var source = """
+            struct X() {}
+        """;
+
+        var node = parseString(source, Parser::parseNamespaceStatement);
+
+        assertThat(
+            node,
+            isUntypedStructDefinitionNode()
+                .withName("X")
+                .withFields(isSequence())
+        );
+    }
+}
-- 
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