Use a more detailed page type for C++ namespaces in navigator index (#817)

* Add `namespace` case for `NavigatorIndex.PageType`.

* Add `RenderIndex` test with namespace node.

* Test `PageType.init(symbolKind:)` with namespace.

* Move case location.

rdar://122340677

Author: mportiz08

Sources/SwiftDocC/Indexing/Navigator/NavigatorIndex.swift

@@ -304,6 +304,9 @@ public class NavigatorIndex {
 
         // A property list key.
         case propertyListKeyReference = 47
+
+        // C++ symbols
+        case namespace = 48
 
         // Special items
         case languageGroup = 127
@@ -336,6 +339,7 @@ public class NavigatorIndex {
             case "enumcm", "structcm", "clm", "intfcm", "type.method": self = .typeMethod
             case "httpget", "httpput", "httppost", "httppatch", "httpdelete": self = .httpRequest
             case "dict": self = .dictionarySymbol
+            case "namespace": self = .namespace
             default: self = .symbol
             }
         }

Sources/SwiftDocC/Indexing/RenderIndexJSON/RenderIndex.swift

@@ -364,6 +364,8 @@ extension NavigatorIndex.PageType {
             return "httpRequest"
         case .dictionarySymbol:
             return "dictionarySymbol"
+        case .namespace:
+            return SymbolGraph.Symbol.KindIdentifier.namespace.renderingIdentifier
         case .propertyListKeyReference:
             return "propertyListKeyReference"
         case .languageGroup:

Tests/SwiftDocCTests/Indexing/NavigatorIndexTests.swift

@@ -1250,6 +1250,7 @@ Root
         XCTAssertEqual(PageType(symbolKind: "union"), .union)
         XCTAssertEqual(PageType(symbolKind: "property"), .instanceProperty)
         XCTAssertEqual(PageType(symbolKind: "dict"), .dictionarySymbol)
+        XCTAssertEqual(PageType(symbolKind: "namespace"), .namespace)
 
         func verifySymbolKind(_ inputs: [String], _ result: PageType) {
             for input in inputs {

Tests/SwiftDocCTests/Indexing/RenderIndexTests.swift

@@ -561,6 +561,29 @@ final class RenderIndexTests: XCTestCase {
             XCTAssertTrue(try XCTUnwrap(renderIndex.interfaceLanguages["swift"])[0].isBeta)
         }
     }
+
+    func testRenderIndexGenerationWithNamespaceNode() throws {
+        try testRenderIndexGenerationFromJSON("""
+        {
+            "interfaceLanguages": {
+                "occ": [
+                    {
+                        "path": "/documentation/framework/foo",
+                        "title": "Foo",
+                        "type": "namespace"
+                    }
+                ]
+            },
+            "schemaVersion": {
+                "major": 0,
+                "minor": 1,
+                "patch": 0
+            }
+        }
+        """) { renderIndex in
+            XCTAssertTrue(try XCTUnwrap(renderIndex.interfaceLanguages["occ"])[0].type == "namespace")
+        }
+    }
 
     func makeRenderIndexJSONSingleNode(withOptionalProperty property: String) -> String {
         return """