Implement full namespace name resolution

1 files changed, 45 insertions, 0 deletions

diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/NamespaceNameResolutionTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/NamespaceNameResolutionTests.java
new file mode 100644
index 0000000..7929e7d
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/NamespaceNameResolutionTests.java
@@ -0,0 +1,45 @@
+package org.zwobble.hobgoblin.compiler.typechecker;
+
+import org.junit.jupiter.api.Test;
+import org.zwobble.hobgoblin.compiler.types.NamespaceName;
+
+import java.util.Optional;
+
+import static org.zwobble.hobgoblin.compiler.typechecker.NamespaceNameResolution.resolveNamespaceName;
+import static org.zwobble.precisely.AssertThat.assertThat;
+import static org.zwobble.precisely.Matchers.equalTo;
+
+public class NamespaceNameResolutionTests {
+    @Test
+    public void whenAncestorDepthIsEmptyThenImportedNamespaceIsUsedAsAbsoluteName() {
+        var current = NamespaceName.of("a", "b");
+        var importedAncestorDepth = Optional.<Integer>empty();
+        var importedNamespaceName = NamespaceName.of("x", "y");
+
+        var result = resolveNamespaceName(current, importedAncestorDepth, importedNamespaceName);
+
+        assertThat(result, equalTo(NamespaceName.of("x", "y")));
+    }
+
+    @Test
+    public void whenAncestorDepthIsZeroThenImportedNamespaceIsJoinedToCurrentNamespace() {
+        var current = NamespaceName.of("a", "b");
+        var importedAncestorDepth = Optional.of(0);
+        var importedNamespaceName = NamespaceName.of("x", "y");
+
+        var result = resolveNamespaceName(current, importedAncestorDepth, importedNamespaceName);
+
+        assertThat(result, equalTo(NamespaceName.of("a", "b", "x", "y")));
+    }
+
+    @Test
+    public void whenAncestorDepthIsGreaterThanZeroThenThatManyPartsAreStrippedOffCurrentNamespaceBeforeJoining() {
+        var current = NamespaceName.of("a", "b", "c");
+        var importedAncestorDepth = Optional.of(2);
+        var importedNamespaceName = NamespaceName.of("x", "y");
+
+        var result = resolveNamespaceName(current, importedAncestorDepth, importedNamespaceName);
+
+        assertThat(result, equalTo(NamespaceName.of("a", "x", "y")));
+    }
+}