Fix inline text/elements coming after block elements

Sources/HTMLStreamer/AttributedStringConverter.swift

@@ -26,6 +26,7 @@ public struct AttributedStringConverter<Callbacks: AttributedStringCallbacks> {
     
     private var actionStack: [ElementAction] = []
     private var styleStack: [Style] = []
+    private var previouslyFinishedBlockElement = false
     // The current run of text w/o styles changing
     private var currentRun: String = ""
     
@@ -144,6 +145,7 @@ public struct AttributedStringConverter<Callbacks: AttributedStringCallbacks> {
     
     private mutating func startBlockElement() {
         if str.length != 0 || !currentRun.isEmpty {
+            previouslyFinishedBlockElement = false
             currentRun.append("\n\n")
         }
     }
@@ -170,15 +172,19 @@ public struct AttributedStringConverter<Callbacks: AttributedStringCallbacks> {
         case "pre":
             finishRun()
             removeLastStyle(.monospace)
+            finishBlockElement()
         case "blockquote":
             finishRun()
             removeLastStyle(.blockquote)
+            finishBlockElement()
         case "ol":
             finishRun()
             removeLastStyle(.orderedList)
+            finishBlockElement()
         case "ul":
             finishRun()
             removeLastStyle(.unorderedList)
+            finishBlockElement()
         case "li":
             finishRun()
         default:
@@ -186,6 +192,13 @@ public struct AttributedStringConverter<Callbacks: AttributedStringCallbacks> {
         }
     }
     
+    private mutating func finishBlockElement() {
+        if str.length != 0 {
+            previouslyFinishedBlockElement = true
+//            currentRun.append("\n\n")
+        }
+    }
+    
     // Finds the last currently-open style of the given type.
     // We can't just use the last one because we need to handle mis-nested tags.
     private mutating func removeLastStyle(_ type: Style.StyleType) {
@@ -234,6 +247,11 @@ public struct AttributedStringConverter<Callbacks: AttributedStringCallbacks> {
         } else if case .replace(let replacement) = actionStack.first(where: \.isReplace) {
             currentRun = replacement
         }
+
+        if previouslyFinishedBlockElement {
+            previouslyFinishedBlockElement = false
+            currentRun.insert(contentsOf: "\n\n", at: currentRun.startIndex)
+        }
         
         var attributes = [NSAttributedString.Key: Any]()
         var currentFontTraits: FontTrait = []

Tests/HTMLStreamerTests/AttributedStringConverterTests.swift

@@ -12,6 +12,9 @@ final class AttributedStringConverterTests: XCTestCase {
     
     #if os(iOS)
     private let font = UIFont.systemFont(ofSize: 13)
+    private lazy var italicFont = UIFont(descriptor: font.fontDescriptor.withSymbolicTraits([.traitItalic])!, size: 13)
+    private lazy var boldFont = UIFont(descriptor: font.fontDescriptor.withSymbolicTraits([.traitBold])!, size: 13)
+    private lazy var boldItalicFont = UIFont(descriptor: font.fontDescriptor.withSymbolicTraits([.traitBold, .traitItalic])!, size: 13)
     private let monospaceFont = UIFont.monospacedSystemFont(ofSize: 13, weight: .regular)
     #elseif os(macOS)
     private let font = NSFont.systemFont(ofSize: 13)
@@ -167,6 +170,36 @@ final class AttributedStringConverterTests: XCTestCase {
         ]))
     }
     
+    func testTextAfterBlockquote() {
+        let result = NSMutableAttributedString()
+        result.append(NSAttributedString(string: "wee", attributes: [
+            .font: italicFont,
+            .paragraphStyle: blockquoteParagraphStyle,
+        ]))
+        result.append(NSAttributedString(string: "\n\nafter", attributes: [
+            .font: font,
+            .paragraphStyle: NSParagraphStyle.default,
+        ]))
+        XCTAssertEqual(convert("<blockquote>wee</blockquote>after"), result)
+    }
+    
+    func testMultipleBlockElements() {
+        let result = NSMutableAttributedString()
+        result.append(NSAttributedString(string: "a", attributes: [
+            .font: italicFont,
+            .paragraphStyle: blockquoteParagraphStyle,
+        ]))
+        result.append(NSAttributedString(string: "\n\n", attributes: [
+            .font: font,
+            .paragraphStyle: NSParagraphStyle.default,
+        ]))
+        result.append(NSAttributedString(string: "b", attributes: [
+            .font: italicFont,
+            .paragraphStyle: blockquoteParagraphStyle,
+        ]))
+        XCTAssertEqual(convert("<blockquote>a</blockquote><blockquote>b</blockquote>"), result)
+    }
+    
     func testSelfClosing() {
         XCTAssertEqual(convert("<b />asdf"), NSAttributedString(string: "asdf", attributes: [
             .font: font,