Revert "Temporarily avoid using FoundationXML to unblock CI"

Sources/SwiftDocC/Infrastructure/Bundle Assets/SVGIDExtractor.swift

@@ -1,7 +1,7 @@
 /*
  This source file is part of the Swift.org open source project
 
- Copyright (c) 2022-2024 Apple Inc. and the Swift project authors
+ Copyright (c) 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
@@ -10,6 +10,12 @@
 
 import Foundation
 
+// On non-Darwin platforms, Foundation's XML support is vended as a separate module:
+// https://github.com/apple/swift-corelibs-foundation/blob/main/Docs/ReleaseNotes_Swift5.md#dependency-management
+#if canImport(FoundationXML)
+import FoundationXML
+#endif
+
 /// A basic XML parser that extracts the first `id` attribute found in the given SVG.
 ///
 /// This is a single-purpose tool and should not be used for general-purpose SVG parsing.
@@ -19,19 +25,14 @@ enum SVGIDExtractor {
     /// Exposed for testing. The sibling `extractID(from: URL)` method is intended to be
     /// used within SwiftDocC.
     static func _extractID(from data: Data) -> String? {
-        // FIXME: Revert this and resume using XMLParser when rdar://138726860 is integrated into a Swift toolchain.
-        for capitalization in ["id", "ID", "Id", "iD"] {
-            guard let idAttributeRange = data.firstRange(of: Data(" \(capitalization)=\"".utf8), in: data.indices) else {
-                continue
-            }
-
-            guard let endQuote = data.firstRange(of: Data("\"".utf8), in: idAttributeRange.upperBound...) else {
-                continue
-            }
-
-            return String(data: data[idAttributeRange.endIndex ..< endQuote.lowerBound], encoding: .utf8)
-        }
-        return nil
+        let delegate = SVGIDParserDelegate()
+        let svgParser = XMLParser(data: data)
+        svgParser.delegate = delegate
+
+        // The delegate aborts the parsing when it finds the ID so the larger parsing operation is not "successful"
+        _ = svgParser.parse()
+
+        return delegate.id
     }
 
     /// Returns the first `id` attribute found in the given SVG, if any.
@@ -46,3 +47,22 @@ enum SVGIDExtractor {
         return _extractID(from: data)
     }
 }
+
+private class SVGIDParserDelegate: NSObject, XMLParserDelegate {
+    var id: String?
+
+    func parser(
+        _ parser: XMLParser,
+        didStartElement elementName: String,
+        namespaceURI: String?,
+        qualifiedName qName: String?,
+        attributes attributeDict: [String : String] = [:]
+    ) {
+        guard let id = attributeDict["id"] ?? attributeDict["ID"] ?? attributeDict["iD"] ?? attributeDict["Id"] else {
+            return
+        }
+
+        self.id = id
+        parser.abortParsing()
+    }
+}

Sources/SwiftDocC/Model/Rendering/Variants/JSONPatchOperation.swift

@@ -74,15 +74,6 @@ public enum JSONPatchOperation: Codable {
     ///   - variantPatchOperation: The patch to apply.
     ///   - pointer: The pointer to the value to update.
     public init<Value>(variantPatchOperation: VariantPatchOperation<Value>, pointer: JSONPointer) {
-        // FIXME: The latest Swift development snapshots (2024-10-30-a and later) is missing the "references" path component. (rdar://139446585)
-        // AFAICT it's the only path that's missing components, so we're working around that issue here.
-        // Since the only RenderNode coding paths that have include a topic reference (as its 2nd component) are
-        // modifications of topics in the "references" section, we can detect and workaround this issue by checking for a "doc://" prefix.
-        var pointer = pointer
-        if pointer.pathComponents.first?.hasPrefix("doc://") == true {
-            pointer = pointer.prependingPathComponents(["references"])
-        }
-
         switch variantPatchOperation {
         case .replace(let value):
             self = .replace(pointer: pointer, encodableValue: value)

Tests/SwiftDocCTests/Infrastructure/SVGIDExtractorTests.swift

@@ -25,19 +25,6 @@ class SVGIDExtractorTests: XCTestCase {
             XCTAssertEqual(id, "plus-id")
         }
 
-        do {
-            let id = extractIDFromSVG(
-                """
-                <?xml version="1.0" encoding="UTF-8"?>
-                <svg viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg" id="plus-id">
-                    <path d="M9.99 0c-5.461 0-9.99 4.539-9.99 10s4.539 10 10 10 10-4.53 10-10-4.539-10-10.010-10zM14.079 10.863h-3.226v3.049c0 0.589-0.323 0.97-0.873 0.97-0.559 0-0.853-0.401-0.853-0.97v-3.049h-3.216c-0.579 0-0.98-0.304-0.98-0.843 0-0.559 0.383-0.873 0.98-0.873h3.216v-3.246c0-0.569 0.294-0.97 0.853-0.97 0.549 0 0.873 0.383 0.873 0.97v3.246h3.226c0.599 0 0.97 0.314 0.97 0.873 0 0.539-0.391 0.843-0.97 0.843z"></path>
-                </svg>
-                """
-            )
-
-            XCTAssertEqual(id, "plus-id")
-        }
-
         do {
             let id = extractIDFromSVG(
                 """