Revert "Revert "add ivar and macro to the known symbol kinds" (#24)"

This reverts commit 3cd58e7.

Author: QuietMisdreavus

Sources/SymbolKit/SymbolGraph/Symbol/KindIdentifier.swift

@@ -1,7 +1,7 @@
 /*
  This source file is part of the Swift.org open source project
 
- Copyright (c) 2021 Apple Inc. and the Swift project authors
+ Copyright (c) 2021-2022 Apple Inc. and the Swift project authors
  Licensed under Apache License v2.0 with Runtime Library Exception
 
  See https://swift.org/LICENSE.txt for license information
@@ -23,6 +23,8 @@ extension SymbolGraph.Symbol {
         case `func`
         case `operator`
         case `init`
+        case ivar
+        case macro
         case method
         case property
         case `protocol`
@@ -53,6 +55,8 @@ extension SymbolGraph.Symbol {
             case .func: return "func"
             case .operator: return "func.op"
             case .`init`: return "init"
+            case .ivar: return "ivar"
+            case .macro: return "macro"
             case .method: return "method"
             case .property: return "property"
             case .protocol: return "protocol"
@@ -86,6 +90,8 @@ extension SymbolGraph.Symbol {
             case "func": return .func
             case "func.op": return .operator
             case "init": return .`init`
+            case "ivar": return .ivar
+            case "macro": return .macro
             case "method": return .method
             case "property": return .property
             case "protocol": return .protocol

Tests/SymbolKitTests/SymbolGraph/Symbol/SymbolKindTests.swift

@@ -1,7 +1,7 @@
 /*
  This source file is part of the Swift.org open source project
 
- Copyright (c) 2021 Apple Inc. and the Swift project authors
+ Copyright (c) 2021-2022 Apple Inc. and the Swift project authors
  Licensed under Apache License v2.0 with Runtime Library Exception
 
  See https://swift.org/LICENSE.txt for license information
@@ -91,4 +91,14 @@ class SymbolKindTests: XCTestCase {
             XCTAssertEqual(kind.displayName, "Function")
         }
     }
+
+    /// Make sure that all the cases added to `KindIdentifier` can parse back as themselves
+    /// when their `identifier` string is given back to the `.init(identifier:)` initializer.
+    func testKindIdentifierRoundtrip() throws {
+        for identifier in SymbolGraph.Symbol.KindIdentifier.allCases {
+            let parsed = SymbolGraph.Symbol.KindIdentifier(identifier: identifier.identifier)
+
+            XCTAssertEqual(identifier, parsed)
+        }
+    }
 }