[Cpp Parser] Separate visitor extraction concerns

cpp/libclang/integration_test/cases/nested_type_relationship/BUILD

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+# *******************************************************************************
+# Copyright (c) 2026 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Apache License Version 2.0 which is available at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-License-Identifier: Apache-2.0
+# *******************************************************************************
+load("//cpp/libclang/integration_test:test_rules.bzl", "cpp_parser_integration_test")
+
+cc_library(
+    name = "nested_type_relationship",
+    srcs = ["transport.cpp"],
+    visibility = ["//cpp/libclang:__subpackages__"],
+)
+
+cpp_parser_integration_test(
+    name = "test_nested_type_relationship",
+    expected_output = ["expected.json"],
+    target = ":nested_type_relationship",
+)

cpp/libclang/integration_test/cases/nested_type_relationship/expected.json

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+{
+  "types": {
+    "demo::Consumer": {
+      "id": "demo::Consumer",
+      "name": "Consumer",
+      "enclosing_namespace_id": "demo",
+      "entity_type": "Class",
+      "enum_literals": [],
+      "methods": [],
+      "relationships": [
+        {
+          "source": "demo::Consumer",
+          "target": "demo::Outer::Inner",
+          "relation_type": "Composition",
+          "source_multiplicity": null,
+          "target_multiplicity": null,
+          "source_location": {
+            "file": "",
+            "line": 23
+          }
+        }
+      ],
+      "template_parameters": null,
+      "type_aliases": [],
+      "variables": [
+        {
+          "name": "inner_",
+          "data_type": "demo::Outer::Inner",
+          "is_static": false,
+          "visibility": "private",
+          "source_location": {
+            "file": "",
+            "line": 23
+          }
+        }
+      ],
+      "source_location": {
+        "file": "cpp/libclang/integration_test/cases/nested_type_relationship/transport.cpp",
+        "line": 21
+      }
+    },
+    "demo::Outer": {
+      "id": "demo::Outer",
+      "name": "Outer",
+      "enclosing_namespace_id": "demo",
+      "entity_type": "Class",
+      "enum_literals": [],
+      "methods": [],
+      "relationships": [],
+      "template_parameters": null,
+      "type_aliases": [],
+      "variables": [],
+      "source_location": {
+        "file": "cpp/libclang/integration_test/cases/nested_type_relationship/transport.cpp",
+        "line": 16
+      }
+    },
+    "demo::Outer::Inner": {
+      "id": "demo::Outer::Inner",
+      "name": "Inner",
+      "enclosing_namespace_id": "demo",
+      "entity_type": "Class",
+      "enum_literals": [],
+      "methods": [],
+      "relationships": [],
+      "template_parameters": null,
+      "type_aliases": [],
+      "variables": [],
+      "source_location": {
+        "file": "cpp/libclang/integration_test/cases/nested_type_relationship/transport.cpp",
+        "line": 18
+      }
+    }
+  },
+  "functions": []
+}

cpp/libclang/integration_test/cases/nested_type_relationship/run_test.rs

@@ -0,0 +1,19 @@
+// *******************************************************************************
+// Copyright (c) 2026 Contributors to the Eclipse Foundation
+//
+// See the NOTICE file(s) distributed with this work for additional
+// information regarding copyright ownership.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Apache License Version 2.0 which is available at
+// <https://www.apache.org/licenses/LICENSE-2.0>
+//
+// SPDX-License-Identifier: Apache-2.0
+// *******************************************************************************
+
+use test_framework::run_parser_case;
+
+#[test]
+fn test_nested_type_relationship() {
+    run_parser_case();
+}

cpp/libclang/integration_test/cases/nested_type_relationship/transport.cpp

@@ -0,0 +1,26 @@
+/********************************************************************************
+ * Copyright (c) 2026 Contributors to the Eclipse Foundation
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+
+namespace demo {
+
+class Outer {
+  public:
+    class Inner {};
+};
+
+class Consumer {
+  private:
+    Outer::Inner inner_;
+};
+
+} // namespace demo

cpp/libclang/src/semantics/BUILD

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+# *******************************************************************************
+# Copyright (c) 2026 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Apache License Version 2.0 which is available at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-License-Identifier: Apache-2.0
+# *******************************************************************************
+
+load("@rules_rust//rust:defs.bzl", "rust_library", "rust_test")
+
+rust_library(
+    name = "cpp_semantics",
+    srcs = [
+        "src/lib.rs",
+        "src/resolved_type.rs",
+    ],
+    visibility = ["//cpp/libclang:__subpackages__"],
+    deps = ["@crates//:serde"],
+)
+
+rust_test(
+    name = "resolved_type_test",
+    srcs = ["src/resolved_type.rs"],
+    deps = ["@crates//:serde"],
+)

cpp/libclang/src/semantics/src/lib.rs

@@ -0,0 +1,16 @@
+// *******************************************************************************
+// Copyright (c) 2026 Contributors to the Eclipse Foundation
+//
+// See the NOTICE file(s) distributed with this work for additional
+// information regarding copyright ownership.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Apache License Version 2.0 which is available at
+// <https://www.apache.org/licenses/LICENSE-2.0>
+//
+// SPDX-License-Identifier: Apache-2.0
+// *******************************************************************************
+
+mod resolved_type;
+
+pub use resolved_type::{EntityId, ResolvedType};