BlockState.dot

@@ -1,126 +0,0 @@
-digraph blockstate  {
-	/* rankdir=LR; */
-	node [shape = doublecircle, fontsize = 18]; end;
-	node [shape = circle, fontsize = 18];
-	edge [fontsize = 18];
-	init [label = "", shape=none, height = .0, width = .0];
-	start;
-	emptyBlock [label = "empty block"];
-	nonEmptyBlock [label = "non-empty block"];
-	emittedSpace [label = "emitted space"];
-	lineBreakTag [label = "line break tag"];
-	atLeastTwoLineBreakTags [label = ">=2 line break tags"];
-	emptyBlockWithAtLeastTwoPreviousLineBreakTags [label = "empty block w/ >=2 prev line break tags"];
-	beginListItem [label = "begin list item"];
-	endListItem [label = "end list item"];
-	listItemContent [label = "list item content"];
-	emittedSpaceInListItemContent [label = "emitted space in text in list item content"];
-	lineBreakTagInListItemContent [label = "line break tag in list item content"];
-	atLeastTwoLineBreakTagsInListItemContent [label = ">= 2 line break tags in list item content"];
-	preformattedStart [label = "preformatted start"];
-	preformattedEmptyBlock [label = "preformatted empty block"];
-	preformattedNonEmptyBlock [label = "preformatted non-empty block"];
-	preformattedLineBreak [label = "preformatted line break"];
-	preformattedAtLeastTwoLineBreaks [label = "preformatted >=2 line breaks"];
-	afterPreStartTag [label = "after <pre> start tag"];
-	afterPreStartTagWithLeadingWhitespace [label = "after <pre> start tag w/ leading whitespace"];
-	preformattedNonEmptyBlockWithTrailingWhitespace [label = "preformatted non-empty block w/ trailing whitespace"];
-	preformattedEmptyBlockWithLeadingWhitespace [label = "preformatted empty block w/ leading whitespace"];
-
-	init -> start;
-	start -> start [label = "whitespace (skip)\n<br> (skip)\n</pre>\nstart/end block"];
-	start -> nonEmptyBlock [label = "non-whitespace"];
-	start -> preformattedStart [label = "<pre> (depth = 1)"];
-	start -> beginListItem [label = "<li>"];
-	nonEmptyBlock -> nonEmptyBlock [label = "non-whitespace"];
-	nonEmptyBlock -> emptyBlock [label = "start/end block"];
-	nonEmptyBlock -> emittedSpace [label = "whitespace (emit space)"];
-	nonEmptyBlock -> lineBreakTag [label = "<br> (append to tmp)"];
-	nonEmptyBlock -> beginListItem [label = "<li>"];
-	nonEmptyBlock -> endListItem [label = "</li>"];
-	emittedSpace -> nonEmptyBlock [label = "non-whitespace"];
-	emittedSpace -> emittedSpace [label = "whitespace (skip)"];
-	emittedSpace -> emptyBlock [label = "start/end block (remove 1)"];
-	emittedSpace -> lineBreakTag [label = "<br> (append to tmp)"];
-	emittedSpace -> end [label = "EOF (remove 1)"];
-	emptyBlock -> nonEmptyBlock [label = "non-whitespace (block break)"];
-	emptyBlock -> emptyBlock [label = "whitespace (skip)\n<br>\n</pre>\nstart/end block"];
-	emptyBlock -> afterPreStartTag [label = "<pre> (depth = 1)"];
-	emptyBlock -> beginListItem [label = "<li>"];
-	emptyBlock -> endListItem [label = "</li>"];
-	lineBreakTag -> lineBreakTag [label = "whitespace (skip)"];
-	lineBreakTag -> atLeastTwoLineBreakTags [label = "<br> (append to tmp)"];
-	lineBreakTag -> emptyBlock [label = "start/end block (clear tmp)"];
-	lineBreakTag -> nonEmptyBlock [label = "non-whitespace (emit tmp)"];
-	atLeastTwoLineBreakTags -> atLeastTwoLineBreakTags [label = "whitespace (skip)\n<br> (append to tmp)"];
-	atLeastTwoLineBreakTags -> nonEmptyBlock [label = "non-whitespace (emit tmp)"];
-	atLeastTwoLineBreakTags -> emptyBlockWithAtLeastTwoPreviousLineBreakTags [label = "start/end block"];
-	emptyBlockWithAtLeastTwoPreviousLineBreakTags -> emptyBlockWithAtLeastTwoPreviousLineBreakTags [label = "whitespace (skip)\n<br>\n</pre>\nstart/end block"];
-	emptyBlockWithAtLeastTwoPreviousLineBreakTags -> nonEmptyBlock [label = "non-whitespace (emit tmp)"];
-	emptyBlockWithAtLeastTwoPreviousLineBreakTags -> afterPreStartTagWithLeadingWhitespace [label = "<pre> (depth = 1)"];
-	beginListItem -> beginListItem [label = "<li>\nwhitespace (skip)\n<br>\nstart/end block"];
-	beginListItem -> listItemContent [label = "non-whitespace"];
-	beginListItem -> endListItem [label = "</li>"];
-	beginListItem -> afterPreStartTagWithLeadingWhitespace [label = "<pre>"];
-	endListItem -> endListItem [label = "whitespace (skip)\n</li>"];
-	endListItem -> beginListItem [label = "<li> (line break)"];
-	endListItem -> emptyBlock [label = "start/end block"];
-	endListItem -> listItemContent [label = "non-whitespace (line break, indent)"];
-	endListItem -> lineBreakTagInListItemContent [label = "<br> (append to tmp)"];
-	listItemContent -> listItemContent [label = "non-whitespace"];
-	listItemContent -> beginListItem [label = "<li> (line break)"];
-	listItemContent -> lineBreakTagInListItemContent [label = "<br> (append to tmp)"];
-	listItemContent -> emittedSpaceInListItemContent [label = "whitespace (emit space)"];
-	listItemContent -> emptyBlock [label = "start/end block"];
-	listItemContent -> endListItem [label = "</li>"];
-	emittedSpaceInListItemContent -> emittedSpaceInListItemContent [label = "whitespace (skip)"];
-	emittedSpaceInListItemContent -> listItemContent [label = "non-whitespace"];
-	emittedSpaceInListItemContent -> end [label = "EOF (remove 1)"];
-	emittedSpaceInListItemContent -> emptyBlock [label = "start/end block (remove 1)"];
-	emittedSpaceInListItemContent -> beginListItem [label = "<li> (remove 1, line break)"];
-	emittedSpaceInListItemContent -> lineBreakTagInListItemContent [label = "<br> (append to tmp)"];
-	emittedSpaceInListItemContent -> endListItem [label = "</li> (remove 1)"];
-	lineBreakTagInListItemContent -> lineBreakTagInListItemContent [label = "whitespace (skip)"];
-	lineBreakTagInListItemContent -> emptyBlock [label = "start/end block (clear tmp)"];
-	lineBreakTagInListItemContent -> beginListItem [label = "<li> (emit tmp, line break)"];
-	lineBreakTagInListItemContent -> listItemContent [label = "non-whitespace (emit tmp)"];
-	lineBreakTagInListItemContent -> atLeastTwoLineBreakTagsInListItemContent [label = "<br> (append to tmp)"];
-	lineBreakTagInListItemContent -> endListItem [label = "</li> (clear tmp)"];
-	atLeastTwoLineBreakTagsInListItemContent -> atLeastTwoLineBreakTagsInListItemContent [label = "<br> (append to tmp)\nwhitespace (skip)"];
-	atLeastTwoLineBreakTagsInListItemContent -> beginListItem [label = "<li> (emit tmp, line break)"];
-	atLeastTwoLineBreakTagsInListItemContent -> emptyBlockWithAtLeastTwoPreviousLineBreakTags [label = "start/end block"];
-	atLeastTwoLineBreakTagsInListItemContent -> listItemContent [label = "non-whitespace (emit tmp)"];
-	atLeastTwoLineBreakTagsInListItemContent -> endListItem [label = "</li> (clear tmp)"];
-	afterPreStartTag -> preformattedLineBreak [label = "<br> (append to tmp, append block break to tmp)"];
-	afterPreStartTag -> preformattedNonEmptyBlock [label = "non \\n (block break)"];
-	afterPreStartTag -> preformattedEmptyBlock [label = "\\n (skip)\nstart/end block"];
-	preformattedLineBreak -> preformattedNonEmptyBlock [label = "non-whitespace (emit tmp)"];
-	preformattedLineBreak -> preformattedNonEmptyBlockWithTrailingWhitespace [label = "other whitespace (append to tmp)"];
-	preformattedLineBreak -> preformattedAtLeastTwoLineBreaks [label = "\\n or <br> (append to tmp)"];
-	preformattedAtLeastTwoLineBreaks -> preformattedAtLeastTwoLineBreaks [label = "\\n or <br> (append to tmp)"];
-	preformattedAtLeastTwoLineBreaks -> preformattedNonEmptyBlock [label = "non \\n or <br> (emit tmp)"];
-	preformattedAtLeastTwoLineBreaks -> preformattedEmptyBlockWithLeadingWhitespace [label = "start/end block"];
-	preformattedEmptyBlockWithLeadingWhitespace -> preformattedEmptyBlockWithLeadingWhitespace [label = "whitespace (append to tmp)\nstart/end block\n</pre> if depth>1&&tmp.count>=2 (depth - 1, remove 1 from tmp)"];
-	preformattedEmptyBlockWithLeadingWhitespace -> preformattedLineBreak [label = "\\n or <br> (append to tmp)"];
-	preformattedEmptyBlockWithLeadingWhitespace -> afterPreStartTagWithLeadingWhitespace [label = "<pre> (depth + 1)"];
-	preformattedEmptyBlockWithLeadingWhitespace -> preformattedEmptyBlock [label = "</pre> if depth>1&&tmp.count<2 (depth - 1, remove 1 from tmp)"];
-	preformattedEmptyBlockWithLeadingWhitespace -> emptyBlock [label = "</pre> if depth<=1 (clear tmp)"];
-	preformattedEmptyBlock -> preformattedEmptyBlock [label = "start/end block\n</pre>if depth>1 (depth - 1)"];
-	preformattedEmptyBlock -> afterPreStartTag [label = "<pre> (depth + 1"];
-	preformattedEmptyBlock -> preformattedNonEmptyBlock [label = "non-whitespace (block break)"];
-	preformattedEmptyBlock -> preformattedEmptyBlockWithLeadingWhitespace [label = "whitespace (append to tmp)"];
-	preformattedEmptyBlock -> preformattedLineBreak [label = "<br> (append to tmp)"];
-	preformattedNonEmptyBlock -> preformattedNonEmptyBlock [label = "non-whitespace"];
-	preformattedNonEmptyBlock -> preformattedLineBreak [label = "\\n or <br> (append to tmp)"];
-	preformattedNonEmptyBlock -> preformattedNonEmptyBlockWithTrailingWhitespace [label = "other whitespace (append to tmp)"];
-	preformattedNonEmptyBlock -> preformattedEmptyBlock [label = "start/end block"];
-	preformattedNonEmptyBlockWithTrailingWhitespace -> preformattedNonEmptyBlockWithTrailingWhitespace [label = "whitespace (append to tmp)"];
-	preformattedNonEmptyBlockWithTrailingWhitespace -> preformattedNonEmptyBlock [label = "non-whitespace (emit tmp)"];
-	preformattedNonEmptyBlockWithTrailingWhitespace -> preformattedLineBreak [label = "\\n or <br> (append to tmp)"];
-	preformattedNonEmptyBlockWithTrailingWhitespace -> preformattedEmptyBlockWithLeadingWhitespace [label = "start/end block (append block break to tmp)"];
-	afterPreStartTagWithLeadingWhitespace -> preformattedNonEmptyBlock [label = "non-whitespace (emit tmp)"];
-	afterPreStartTagWithLeadingWhitespace -> preformattedEmptyBlockWithLeadingWhitespace [label = "\\n (skip)\nother whitespace (append to tmp)\n<br> (append to tmp)\nstart/end block"];
-	preformattedStart -> preformattedStart [label = "<pre> (depth + 1)\n</pre> if depth>1 (depth - 1)\n\\n or <br> (skip)\nstart/end block"];
-	preformattedStart -> start [label = "</pre> if depth<=1"];
-	preformattedStart -> preformattedNonEmptyBlock [label = "non \\n"];
-}

Sources/HTMLStreamer/AttributedStringConverter.swift

@@ -17,7 +17,7 @@ private typealias PlatformFont = UIFont
 private typealias PlatformFont = NSFont
 #endif
 
-public class AttributedStringConverter<Callbacks: HTMLConversionCallbacks> {
+public struct AttributedStringConverter<Callbacks: HTMLConversionCallbacks>: BlockRenderer {
     private let configuration: AttributedStringConverterConfiguration
     private var fontCache: [FontTrait: PlatformFont] = [:]
     
@@ -26,13 +26,13 @@ public class AttributedStringConverter<Callbacks: HTMLConversionCallbacks> {
     
     private var actionStack: [ElementAction] = []
     private var styleStack: [Style] = []
-    private var blockStateMachine = BlockStateMachine(blockBreak: "", lineBreak: "", listIndentForContentOutsideItem: "", append: { _ in }, removeChar: {})
+    var blockState = BlockState.start
     private var currentElementIsEmpty = true
     private var previouslyFinishedListItem = false
     // The current run of text w/o styles changing
     private var currentRun: String = ""
     
-    public convenience init(configuration: AttributedStringConverterConfiguration) where Callbacks == DefaultCallbacks {
+    public init(configuration: AttributedStringConverterConfiguration) where Callbacks == DefaultCallbacks {
         self.init(configuration: configuration, callbacks: DefaultCallbacks.self)
     }
     
@@ -40,17 +40,13 @@ public class AttributedStringConverter<Callbacks: HTMLConversionCallbacks> {
         self.configuration = configuration
     }
     
-    public func convert(html: String) -> NSAttributedString {
+    public mutating func convert(html: String) -> NSAttributedString {
         tokenizer = Tokenizer(chars: html.unicodeScalars.makeIterator())
         str = NSMutableAttributedString()
         
         actionStack = []
         styleStack = []
-        blockStateMachine = BlockStateMachine(blockBreak: "\n\n", lineBreak: "\n", listIndentForContentOutsideItem: "\t\t", append: { [unowned self] in
+        blockState = .start
-            self.append($0)
-        }, removeChar: { [unowned self] in
-            self.removeChar()
-        })
         currentElementIsEmpty = true
         previouslyFinishedListItem = false
         currentRun = ""
@@ -59,16 +55,12 @@ public class AttributedStringConverter<Callbacks: HTMLConversionCallbacks> {
             switch token {
             case .character(let c):
                 currentElementIsEmpty = false
-                if blockStateMachine.continueBlock(char: c) {
+                continueBlock()
-                    currentRun.unicodeScalars.append(c)
+                currentRun.unicodeScalars.append(c)
-                }
             case .characterSequence(let s):
                 currentElementIsEmpty = false
-                for c in s.unicodeScalars {
+                continueBlock()
-                    if blockStateMachine.continueBlock(char: c) {
+                currentRun.append(s)
-                        currentRun.unicodeScalars.append(c)
-                    }
-                }
             case .comment:
                 // ignored
                 continue
@@ -95,15 +87,14 @@ public class AttributedStringConverter<Callbacks: HTMLConversionCallbacks> {
             }
         }
         
-        blockStateMachine.endBlocks()
         finishRun()
         
         return str
     }
     
-    private func handleStartTag(_ name: String, selfClosing: Bool, attributes: [Attribute]) {
+    private mutating func handleStartTag(_ name: String, selfClosing: Bool, attributes: [Attribute]) {
         if name == "br" {
-            blockStateMachine.breakTag()
+            currentRun.append("\n")
             return
         }
         // self closing tags are ignored since they have no content
@@ -135,25 +126,29 @@ public class AttributedStringConverter<Callbacks: HTMLConversionCallbacks> {
             finishRun()
             styleStack.append(.monospace)
         case "pre":
-            blockStateMachine.startOrEndBlock()
+            startOrFinishBlock()
-            blockStateMachine.startPreformatted()
             finishRun()
             styleStack.append(.monospace)
         case "blockquote":
-            blockStateMachine.startOrEndBlock()
+            startOrFinishBlock()
             finishRun()
             styleStack.append(.blockquote)
         case "p":
-            blockStateMachine.startOrEndBlock()
+            startOrFinishBlock()
         case "ol":
-            blockStateMachine.startOrEndBlock()
+            startOrFinishBlock()
             finishRun()
             styleStack.append(.orderedList(nextElementOrdinal: 1))
         case "ul":
-            blockStateMachine.startOrEndBlock()
+            startOrFinishBlock()
             finishRun()
             styleStack.append(.unorderedList)
         case "li":
+            if previouslyFinishedListItem {
+                currentRun.append("\n")
+            } else {
+                continueBlock()
+            }
             let marker: String
             if case .orderedList(let nextElementOrdinal) = styleStack.last {
                 marker = orderedTextList.marker(forItemNumber: nextElementOrdinal)
@@ -163,14 +158,13 @@ public class AttributedStringConverter<Callbacks: HTMLConversionCallbacks> {
             } else {
                 break
             }
-            blockStateMachine.startListItem()
             currentRun.append("\t\(marker)\t")
         default:
             break
         }
     }
     
-    private func handleEndTag(_ name: String) {
+    private mutating func handleEndTag(_ name: String) {
         switch name {
         case "a":
             if case .link(.some(_)) = lastStyle(.link) {
@@ -192,60 +186,38 @@ public class AttributedStringConverter<Callbacks: HTMLConversionCallbacks> {
         case "pre":
             finishRun()
             removeLastStyle(.monospace)
-            blockStateMachine.startOrEndBlock()
+            startOrFinishBlock()
-            blockStateMachine.endPreformatted()
         case "blockquote":
             finishRun()
             removeLastStyle(.blockquote)
-            blockStateMachine.startOrEndBlock()
+            startOrFinishBlock()
         case "p":
-            blockStateMachine.startOrEndBlock()
+            startOrFinishBlock()
         case "ol":
             finishRun()
             removeLastStyle(.orderedList)
-            blockStateMachine.startOrEndBlock()
+            startOrFinishBlock()
             previouslyFinishedListItem = false
         case "ul":
             finishRun()
             removeLastStyle(.unorderedList)
-            blockStateMachine.startOrEndBlock()
+            startOrFinishBlock()
             previouslyFinishedListItem = false
         case "li":
             finishRun()
             previouslyFinishedListItem = true
-            blockStateMachine.endListItem()
         default:
             break
         }
     }
     
-    var blockBreak: String {
+    mutating func insertBlockBreak() {
-        "\n\n"
+        currentRun.append("\n\n")
-    }
-    
-    var lineBreak: String {
-        "\n"
-    }
-    
-    var listIndentForContentOutsideItem: String {
-        "\t\t"
-    }
-    
-    func append(_ s: String) {
-        currentRun.append(s)
-    }
-    
-    func removeChar() {
-        if currentRun.isEmpty {
-            str.deleteCharacters(in: NSRange(location: str.length - 1, length: 1))
-        } else {
-            currentRun.removeLast()
-        }
     }
     
     // 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 func removeLastStyle(_ type: Style.StyleType) {
+    private mutating func removeLastStyle(_ type: Style.StyleType) {
         var i = styleStack.index(before: styleStack.endIndex)
         while i >= styleStack.startIndex {
             if styleStack[i].type == type {
@@ -280,7 +252,7 @@ public class AttributedStringConverter<Callbacks: HTMLConversionCallbacks> {
         return style
     }()
     
-    private func finishRun() {
+    private mutating func finishRun() {
         if actionStack.contains(.skip) {
             currentRun = ""
             return
@@ -328,7 +300,7 @@ public class AttributedStringConverter<Callbacks: HTMLConversionCallbacks> {
         currentRun = ""
     }
     
-    private func getFont(traits: FontTrait) -> PlatformFont? {
+    private mutating func getFont(traits: FontTrait) -> PlatformFont? {
         if let cached = fontCache[traits] {
             return cached
         }

Sources/HTMLStreamer/BlockState.swift

@@ -7,581 +7,39 @@
 
 import Foundation
 
-/*
+protocol BlockRenderer {
- 
+    var blockState: BlockState { get set }
- This gnarly mess of a state machine is responsible for:
+    mutating func insertBlockBreak()
- 1) Inserting line breaks in the right places corresponding to boundaries between block elements
- 2) Preventing leading/trailing whitespace from being emitted
- 3) Collapsing whitespace within the string like https://www.w3.org/TR/css-text-3/#white-space-phase-1
- 4) Handling whitespace inside <pre> elements
- 
- DO NOT TOUCH THE CODE WITHOUT CHECKING/UPDATING THE DIAGRAM.
-
- */
-
-struct BlockStateMachine {
-    var blockState: BlockState = .start
-    let blockBreak: String
-    let lineBreak: String
-    let listIndentForContentOutsideItem: String
-    var temporaryBuffer: String = ""
-    let append: (String) -> Void
-    let removeChar: () -> Void
 }
 
-extension BlockStateMachine {
+extension BlockRenderer {
-    mutating func startOrEndBlock() {
+    mutating func startOrFinishBlock() {
         switch blockState {
         case .start:
             break
-        case .emptyBlock:
-            break
         case .nonEmptyBlock:
             blockState = .emptyBlock
-        case .emittedSpace:
+        case .emptyBlock:
-            blockState = .emptyBlock
-            removeChar()
-        case .lineBreakTag:
-            blockState = .emptyBlock
-            temporaryBuffer = ""
-        case .atLeastTwoLineBreakTags:
-            blockState = .emptyBlockWithAtLeastTwoPreviousLineBreakTags
-        case .emptyBlockWithAtLeastTwoPreviousLineBreakTags:
-            break
-        case .beginListItem:
-            break
-        case .endListItem:
-            blockState = .emptyBlock
-        case .listItemContent:
-            blockState = .emptyBlock
-        case .emittedSpaceInListItemContent:
-            blockState = .emptyBlock
-            removeChar()
-        case .lineBreakTagInListItemContent:
-            blockState = .emptyBlock
-            temporaryBuffer = ""
-        case .atLeastTwoLineBreakTagsInListItemContent:
-            blockState = .emptyBlockWithAtLeastTwoPreviousLineBreakTags
-        case .preformattedStart(depth: _):
-            break
-        case .preformattedEmptyBlock(depth: _):
-            break
-        case .preformattedNonEmptyBlock(let depth):
-            blockState = .preformattedEmptyBlock(depth: depth)
-        case .preformattedLineBreak(depth: let depth):
-            blockState = .preformattedEmptyBlockWithLeadingWhitespace(depth: depth)
-            temporaryBuffer.append(lineBreak)
-        case .preformattedAtLeastTwoLineBreaks(let depth):
-            blockState = .preformattedEmptyBlockWithLeadingWhitespace(depth: depth)
-        case .afterPreStartTag(let depth):
-            blockState = .preformattedEmptyBlock(depth: depth)
-        case .afterPreStartTagWithLeadingWhitespace(let depth):
-            blockState = .preformattedEmptyBlockWithLeadingWhitespace(depth: depth)
-        case .preformattedNonEmptyBlockWithTrailingWhitespace(depth: _):
-            temporaryBuffer.append(blockBreak)
-        case .preformattedEmptyBlockWithLeadingWhitespace(depth: _):
             break
         }
     }
     
-    mutating func continueBlock(char: UnicodeScalar) -> Bool {
+    mutating func continueBlock() {
-        let isNewline = char == "\n"
-        let isWhitespace = isNewline || isWhitespace(char)
         switch blockState {
         case .start:
-            if isWhitespace {
+            blockState = .nonEmptyBlock
-                return false
-            } else {
-                blockState = .nonEmptyBlock
-                return true
-            }
-        case .emptyBlock:
-            if isWhitespace {
-                return false
-            } else {
-                blockState = .nonEmptyBlock
-                append(blockBreak)
-                return true
-            }
         case .nonEmptyBlock:
-            if isWhitespace {
+            break
-                blockState = .emittedSpace
+        case .emptyBlock:
-                append(" ")
+            insertBlockBreak()
-                return false
+            blockState = .nonEmptyBlock
-            } else {
-                return true
-            }
-        case .emittedSpace:
-            if isWhitespace {
-                return false
-            } else {
-                blockState = .nonEmptyBlock
-                return true
-            }
-        case .lineBreakTag:
-            if isWhitespace {
-                return false
-            } else {
-                blockState = .nonEmptyBlock
-                append(temporaryBuffer)
-                temporaryBuffer = ""
-                return true
-            }
-        case .atLeastTwoLineBreakTags:
-            if isWhitespace {
-                return false
-            } else {
-                blockState = .nonEmptyBlock
-                append(temporaryBuffer)
-                temporaryBuffer = ""
-                return true
-            }
-        case .emptyBlockWithAtLeastTwoPreviousLineBreakTags:
-            if isWhitespace {
-                return false
-            } else {
-                blockState = .nonEmptyBlock
-                append(temporaryBuffer)
-                temporaryBuffer = ""
-                return true
-            }
-        case .beginListItem:
-            if isWhitespace {
-                return false
-            } else {
-                blockState = .listItemContent
-                return true
-            }
-        case .endListItem:
-            if isWhitespace {
-                return false
-            } else {
-                blockState = .listItemContent
-                append(lineBreak)
-                append(listIndentForContentOutsideItem)
-                return true
-            }
-        case .listItemContent:
-            if isWhitespace {
-                blockState = .emittedSpaceInListItemContent
-                append(" ")
-                return false
-            } else {
-                return true
-            }
-        case .emittedSpaceInListItemContent:
-            if isWhitespace {
-                return false
-            } else {
-                blockState = .listItemContent
-                return true
-            }
-        case .lineBreakTagInListItemContent:
-            if isWhitespace {
-                return false
-            } else {
-                blockState = .listItemContent
-                append(temporaryBuffer)
-                temporaryBuffer = ""
-                return true
-            }
-        case .atLeastTwoLineBreakTagsInListItemContent:
-            if isWhitespace {
-                return false
-            } else {
-                blockState = .listItemContent
-                append(temporaryBuffer)
-                temporaryBuffer = ""
-                return true
-            }
-        case .preformattedStart(let depth):
-            if isNewline {
-                return false
-            } else {
-                blockState = .preformattedNonEmptyBlock(depth: depth)
-                return true
-            }
-        case .preformattedEmptyBlock(depth: let depth):
-            if isWhitespace {
-                blockState = .preformattedEmptyBlockWithLeadingWhitespace(depth: depth)
-                temporaryBuffer.unicodeScalars.append(char)
-                return false
-            } else {
-                blockState = .preformattedNonEmptyBlock(depth: depth)
-                append(blockBreak)
-                return true
-            }
-        case .preformattedNonEmptyBlock(let depth):
-            if isNewline {
-                blockState = .preformattedLineBreak(depth: depth)
-                temporaryBuffer.append(lineBreak)
-                return false
-            } else if isWhitespace {
-                blockState = .preformattedNonEmptyBlockWithTrailingWhitespace(depth: depth)
-                temporaryBuffer.unicodeScalars.append(char)
-                return false
-            } else {
-                return true
-            }
-        case .preformattedLineBreak(let depth):
-            if isNewline {
-                blockState = .preformattedAtLeastTwoLineBreaks(depth: depth)
-                temporaryBuffer.append(lineBreak)
-                return false
-            } else if isWhitespace {
-                blockState = .preformattedNonEmptyBlockWithTrailingWhitespace(depth: depth)
-                temporaryBuffer.unicodeScalars.append(char)
-                return false
-            } else {
-                blockState = .preformattedNonEmptyBlock(depth: depth)
-                append(temporaryBuffer)
-                temporaryBuffer = ""
-                return true
-            }
-        case .preformattedAtLeastTwoLineBreaks(let depth):
-            if isWhitespace {
-                temporaryBuffer.unicodeScalars.append(char)
-                return false
-            } else {
-                blockState = .preformattedNonEmptyBlock(depth: depth)
-                append(temporaryBuffer)
-                temporaryBuffer = ""
-                return true
-            }
-        case .afterPreStartTag(let depth):
-            if isNewline {
-                blockState = .preformattedEmptyBlock(depth: depth)
-                return false
-            } else {
-                blockState = .preformattedNonEmptyBlock(depth: depth)
-                append(blockBreak)
-                return true
-            }
-        case .afterPreStartTagWithLeadingWhitespace(let depth):
-            if isNewline {
-                blockState = .preformattedEmptyBlockWithLeadingWhitespace(depth: depth)
-                return false
-            } else if isWhitespace {
-                blockState = .preformattedEmptyBlockWithLeadingWhitespace(depth: depth)
-                temporaryBuffer.unicodeScalars.append(char)
-                return false
-            } else {
-                blockState = .preformattedNonEmptyBlock(depth: depth)
-                append(temporaryBuffer)
-                temporaryBuffer = ""
-                return true
-            }
-        case .preformattedNonEmptyBlockWithTrailingWhitespace(let depth):
-            if isNewline {
-                blockState = .preformattedLineBreak(depth: depth)
-                temporaryBuffer.append(lineBreak)
-                return false
-            } else if isWhitespace {
-                temporaryBuffer.unicodeScalars.append(char)
-                return false
-            } else {
-                blockState = .preformattedNonEmptyBlock(depth: depth)
-                append(temporaryBuffer)
-                temporaryBuffer = ""
-                return true
-            }
-        case .preformattedEmptyBlockWithLeadingWhitespace(let depth):
-            if isNewline {
-                blockState = .preformattedLineBreak(depth: depth)
-                temporaryBuffer.append(lineBreak)
-                return false
-            } else if isWhitespace {
-                temporaryBuffer.unicodeScalars.append(char)
-                return false
-            } else {
-                blockState = .preformattedNonEmptyBlock(depth: depth)
-                append(temporaryBuffer)
-                temporaryBuffer = ""
-                return true
-            }
         }
     }
     
-    mutating func breakTag() {
-        switch blockState {
-        case .start:
-            break
-        case .emptyBlock:
-            append(lineBreak)
-        case .nonEmptyBlock:
-            blockState = .lineBreakTag
-            temporaryBuffer.append(lineBreak)
-        case .emittedSpace:
-            blockState = .lineBreakTag
-            temporaryBuffer.append(lineBreak)
-        case .lineBreakTag:
-            blockState = .atLeastTwoLineBreakTags
-            temporaryBuffer.append(lineBreak)
-        case .atLeastTwoLineBreakTags:
-            temporaryBuffer.append(lineBreak)
-        case .emptyBlockWithAtLeastTwoPreviousLineBreakTags:
-            append(lineBreak)
-        case .beginListItem:
-            append(lineBreak)
-        case .endListItem:
-            blockState = .lineBreakTagInListItemContent
-            temporaryBuffer.append(lineBreak)
-        case .listItemContent:
-            blockState = .lineBreakTagInListItemContent
-            temporaryBuffer.append(lineBreak)
-        case .emittedSpaceInListItemContent:
-            blockState = .lineBreakTagInListItemContent
-            temporaryBuffer.append(lineBreak)
-        case .lineBreakTagInListItemContent:
-            blockState = .atLeastTwoLineBreakTagsInListItemContent
-            temporaryBuffer.append(lineBreak)
-        case .atLeastTwoLineBreakTagsInListItemContent:
-            temporaryBuffer.append(lineBreak)
-        case .preformattedStart(depth: _):
-            break
-        case .preformattedEmptyBlock(let depth):
-            blockState = .preformattedLineBreak(depth: depth)
-            temporaryBuffer.append(lineBreak)
-        case .preformattedNonEmptyBlock(let depth):
-            blockState = .preformattedLineBreak(depth: depth)
-            temporaryBuffer.append(lineBreak)
-        case .preformattedLineBreak(let depth):
-            blockState = .preformattedAtLeastTwoLineBreaks(depth: depth)
-            temporaryBuffer.append(lineBreak)
-        case .preformattedAtLeastTwoLineBreaks(depth: _):
-            temporaryBuffer.append(lineBreak)
-        case .afterPreStartTag(let depth):
-            blockState = .preformattedLineBreak(depth: depth)
-            temporaryBuffer.append(blockBreak)
-            temporaryBuffer.append(lineBreak)
-        case .afterPreStartTagWithLeadingWhitespace(let depth):
-            blockState = .preformattedEmptyBlockWithLeadingWhitespace(depth: depth)
-            temporaryBuffer.append(lineBreak)
-        case .preformattedNonEmptyBlockWithTrailingWhitespace(let depth):
-            blockState = .preformattedLineBreak(depth: depth)
-            temporaryBuffer.append(lineBreak)
-        case .preformattedEmptyBlockWithLeadingWhitespace(let depth):
-            blockState = .preformattedLineBreak(depth: depth)
-            temporaryBuffer.append(lineBreak)
-        }
-    }
-    
-    mutating func startPreformatted() {
-        switch blockState {
-        case .start:
-            blockState = .preformattedStart(depth: 1)
-        case .emptyBlock:
-            blockState = .afterPreStartTag(depth: 1)
-        case .nonEmptyBlock:
-            fatalError("unreachable")
-        case .emittedSpace:
-            fatalError("unreachable")
-        case .lineBreakTag:
-            fatalError("unreachable")
-        case .atLeastTwoLineBreakTags:
-            fatalError("unreachable")
-        case .emptyBlockWithAtLeastTwoPreviousLineBreakTags:
-            blockState = .afterPreStartTagWithLeadingWhitespace(depth: 1)
-        case .beginListItem:
-            blockState = .afterPreStartTagWithLeadingWhitespace(depth: 1)
-        case .endListItem:
-            fatalError("unreachable")
-        case .listItemContent:
-            fatalError("unreachable")
-        case .emittedSpaceInListItemContent:
-            fatalError("unreachable")
-        case .lineBreakTagInListItemContent:
-            fatalError("unreachable")
-        case .atLeastTwoLineBreakTagsInListItemContent:
-            fatalError("unreachable")
-        case .preformattedStart(let depth):
-            blockState = .preformattedStart(depth: depth + 1)
-        case .preformattedEmptyBlock(let depth):
-            blockState = .afterPreStartTag(depth: depth + 1)
-        case .preformattedNonEmptyBlock(depth: _):
-            fatalError("unreachable")
-        case .preformattedLineBreak(depth: _):
-            fatalError("unreachable")
-        case .preformattedAtLeastTwoLineBreaks(depth: _):
-            fatalError("unreachable")
-        case .afterPreStartTag(depth: _):
-            fatalError("unreachable")
-        case .afterPreStartTagWithLeadingWhitespace(depth: _):
-            fatalError("unreachable")
-        case .preformattedNonEmptyBlockWithTrailingWhitespace(depth: _):
-            fatalError("unreachable")
-        case .preformattedEmptyBlockWithLeadingWhitespace(let depth):
-            blockState = .afterPreStartTagWithLeadingWhitespace(depth: depth + 1)
-        }
-    }
-    
-    mutating func endPreformatted() {
-        switch blockState {
-        case .start:
-            break
-        case .emptyBlock:
-            break
-        case .nonEmptyBlock:
-            fatalError("unreachable")
-        case .emittedSpace:
-            fatalError("unreachable")
-        case .lineBreakTag:
-            fatalError("unreachable")
-        case .atLeastTwoLineBreakTags:
-            fatalError("unreachable")
-        case .emptyBlockWithAtLeastTwoPreviousLineBreakTags:
-            break
-        case .beginListItem:
-            break
-        case .endListItem:
-            fatalError("unreachable")
-        case .listItemContent:
-            fatalError("unreachable")
-        case .emittedSpaceInListItemContent:
-            fatalError("unreachable")
-        case .lineBreakTagInListItemContent:
-            fatalError("unreachable")
-        case .atLeastTwoLineBreakTagsInListItemContent:
-            fatalError("unreachable")
-        case .preformattedStart(let depth):
-            if depth <= 1 {
-                blockState = .start
-            } else {
-                blockState = .preformattedStart(depth: depth - 1)
-            }
-        case .preformattedEmptyBlock(let depth):
-            if depth <= 1 {
-                blockState = .emptyBlock
-            } else {
-                blockState = .preformattedEmptyBlock(depth: depth - 1)
-            }
-        case .preformattedNonEmptyBlock(depth: _):
-            fatalError("unreachable")
-        case .preformattedLineBreak(depth: _):
-            fatalError("unreachable")
-        case .preformattedAtLeastTwoLineBreaks(depth: _):
-            fatalError("unreachable")
-        case .afterPreStartTag(depth: _):
-            fatalError("unreachable")
-        case .afterPreStartTagWithLeadingWhitespace(depth: _):
-            fatalError("unreachable")
-        case .preformattedNonEmptyBlockWithTrailingWhitespace(depth: _):
-            fatalError("unreachable")
-        case .preformattedEmptyBlockWithLeadingWhitespace(let depth):
-            if depth <= 1 {
-                blockState = .emptyBlock
-                temporaryBuffer = ""
-            } else {
-                if temporaryBuffer.count >= 2 {
-                    temporaryBuffer.removeLast()
-                    blockState = .preformattedEmptyBlockWithLeadingWhitespace(depth: depth - 1)
-                } else {
-                    temporaryBuffer.removeLast()
-                    blockState = .preformattedEmptyBlock(depth: depth - 1)
-                }
-            }
-        }
-    }
-    
-    mutating func startListItem() {
-        switch blockState {
-        case .start:
-            blockState = .beginListItem
-        case .emptyBlock:
-            blockState = .beginListItem
-            append(blockBreak)
-        case .nonEmptyBlock:
-            blockState = .beginListItem
-            append(blockBreak)
-        case .beginListItem:
-            break
-        case .endListItem:
-            blockState = .beginListItem
-            append(lineBreak)
-        case .listItemContent:
-            blockState = .beginListItem
-            append(lineBreak)
-        case .emittedSpaceInListItemContent:
-            blockState = .beginListItem
-            removeChar()
-            append(lineBreak)
-        case .lineBreakTagInListItemContent:
-            blockState = .beginListItem
-            append(temporaryBuffer)
-            temporaryBuffer = ""
-            append(lineBreak)
-        case .atLeastTwoLineBreakTagsInListItemContent:
-            blockState = .beginListItem
-            append(temporaryBuffer)
-            temporaryBuffer = ""
-            append(lineBreak)
-        default:
-            break
-        }
-    }
-    
-    mutating func endListItem() {
-        switch blockState {
-        case .emptyBlock:
-            blockState = .endListItem
-        case .nonEmptyBlock:
-            blockState = .endListItem
-        case .listItemContent:
-            blockState = .endListItem
-        case .emittedSpaceInListItemContent:
-            blockState = .endListItem
-            removeChar()
-        case .lineBreakTagInListItemContent:
-            blockState = .endListItem
-            temporaryBuffer = ""
-        case .atLeastTwoLineBreakTagsInListItemContent:
-            blockState = .endListItem
-            temporaryBuffer = ""
-        default:
-            break
-        }
-    }
-    
-    mutating func endBlocks() {
-        switch blockState {
-        case .emittedSpace:
-            removeChar()
-        case .emittedSpaceInListItemContent:
-            removeChar()
-        default:
-            break
-        }
-    }
 }
 
 enum BlockState: Equatable {
     case start
-    case emptyBlock
     case nonEmptyBlock
-    case emittedSpace
+    case emptyBlock
-    case lineBreakTag
-    case atLeastTwoLineBreakTags
-    case emptyBlockWithAtLeastTwoPreviousLineBreakTags
-    case beginListItem
-    case endListItem
-    case listItemContent
-    case emittedSpaceInListItemContent
-    case lineBreakTagInListItemContent
-    case atLeastTwoLineBreakTagsInListItemContent
-    case preformattedStart(depth: Int32)
-    case preformattedEmptyBlock(depth: Int32)
-    case preformattedNonEmptyBlock(depth: Int32)
-    case preformattedLineBreak(depth: Int32)
-    case preformattedAtLeastTwoLineBreaks(depth: Int32)
-    case afterPreStartTag(depth: Int32)
-    case afterPreStartTagWithLeadingWhitespace(depth: Int32)
-    case preformattedNonEmptyBlockWithTrailingWhitespace(depth: Int32)
-    case preformattedEmptyBlockWithLeadingWhitespace(depth: Int32)
-}
-
-@inline(__always)
-private func isWhitespace(_ c: UnicodeScalar) -> Bool {
-    // this is not strictly correct, but checking the actual unicode properties is slow
-    // and this should cover the vast majority of actual use
-    c == " " || c == "\n" || c == "\t" || c == "\u{A0}" /* NO-BREAK SPACE */
 }

Sources/HTMLStreamer/TextConverter.swift

@@ -7,18 +7,19 @@
 
 import Foundation
 
-public class TextConverter<Callbacks: HTMLConversionCallbacks> {
+public struct TextConverter<Callbacks: HTMLConversionCallbacks>: BlockRenderer {
+    
     private let configuration: TextConverterConfiguration
     
     private var tokenizer: Tokenizer<String.UnicodeScalarView.Iterator>!
     private var str: String!
     
     private var actionStack: [ElementAction] = []
-    var blockStateMachine = BlockStateMachine(blockBreak: "", lineBreak: "", listIndentForContentOutsideItem: "", append: { _ in }, removeChar: {})
+    var blockState = BlockState.start
     private var currentElementIsEmpty = true
     private var currentRun = ""
     
-    public convenience init(configuration: TextConverterConfiguration = .init()) where Callbacks == DefaultCallbacks {
+    public init(configuration: TextConverterConfiguration = .init()) where Callbacks == DefaultCallbacks {
         self.init(configuration: configuration, callbacks: DefaultCallbacks.self)
     }
     
@@ -26,19 +27,11 @@ public class TextConverter<Callbacks: HTMLConversionCallbacks> {
         self.configuration = configuration
     }
     
-    public func convert(html: String) -> String {
+    public mutating func convert(html: String) -> String {
         tokenizer = Tokenizer(chars: html.unicodeScalars.makeIterator())
         str = ""
         
-        blockStateMachine = BlockStateMachine(
+        blockState = .start
-            blockBreak: configuration.insertNewlines ? "\n\n" : " " ,
-            lineBreak: configuration.insertNewlines ? "\n" : " " ,
-            listIndentForContentOutsideItem: "",
-            append: { [unowned self] in
-                self.append($0)
-            }, removeChar: { [unowned self] in
-                self.removeChar()
-            })
         currentElementIsEmpty = true
         currentRun = ""
         
@@ -46,16 +39,12 @@ public class TextConverter<Callbacks: HTMLConversionCallbacks> {
             switch token {
             case .character(let scalar):
                 currentElementIsEmpty = false
-                if blockStateMachine.continueBlock(char: scalar) {
+                continueBlock()
-                    currentRun.unicodeScalars.append(scalar)
+                currentRun.unicodeScalars.append(scalar)
-                }
             case .characterSequence(let string):
                 currentElementIsEmpty = false
-                for c in string.unicodeScalars {
+                continueBlock()
-                    if blockStateMachine.continueBlock(char: c) {
+                currentRun.append(string)
-                        currentRun.unicodeScalars.append(c)
-                    }
-                }
             case .startTag(let name, let selfClosing, let attributes):
                 currentElementIsEmpty = true
                 let action = Callbacks.elementAction(name: name, attributes: attributes)
@@ -77,66 +66,45 @@ public class TextConverter<Callbacks: HTMLConversionCallbacks> {
             }
         }
         
-        blockStateMachine.endBlocks()
         finishRun()
         
         return str
     }
     
-    private func handleStartTag(_ name: String, selfClosing: Bool, attributes: [Attribute]) {
+    private mutating func handleStartTag(_ name: String, selfClosing: Bool, attributes: [Attribute]) {
         switch name {
         case "br":
-            blockStateMachine.breakTag()
+            if configuration.insertNewlines {
+                currentRun.append("\n")
+            } else {
+                currentRun.append(" ")
+            }
         case "pre", "blockquote", "p", "ol", "ul":
-            blockStateMachine.startOrEndBlock()
+            startOrFinishBlock()
         default:
             break
         }
     }
     
-    private func handleEndTag(_ name: String) {
+    private mutating func handleEndTag(_ name: String) {
         switch name {
         case "pre", "blockquote", "p", "ol", "ul":
-            blockStateMachine.startOrEndBlock()
+            startOrFinishBlock()
             finishRun()
         default:
             break
         }
     }
     
-    var blockBreak: String {
+    mutating func insertBlockBreak() {
         if configuration.insertNewlines {
-            "\n\n"
+            currentRun.append("\n\n")
         } else {
-            " "
+            currentRun.append(" ")
         }
     }
-    
+
-    var lineBreak: String {
+    private mutating func finishRun() {
-        if configuration.insertNewlines {
-            "\n"
-        } else {
-            " "
-        }
-    }
-    
-    var listIndentForContentOutsideItem: String {
-        " "
-    }
-    
-    func append(_ s: String) {
-        currentRun.append(s)
-    }
-    
-    func removeChar() {
-        if currentRun.isEmpty {
-            str.removeLast()
-        } else {
-            currentRun.removeLast()
-        }
-    }
-    
-    private func finishRun() {
         if actionStack.contains(.skip) {
             currentRun = ""
             return

Tests/HTMLStreamerTests/AttributedStringConverterTests.swift

@@ -327,15 +327,6 @@ final class AttributedStringConverterTests: XCTestCase {
         XCTAssertEqual(convert("a<ol><li>b</li><li>c</li></ol>"), result)
     }
     
-    func testListItemOutsideList() {
-        let result = NSAttributedString(string: "a", attributes: [
-            .font: font,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<li>a</li>"), result)
-    }
-    
     func testSkipElementActionFollowingUnfinishedRun() {
         struct Callbacks: HTMLConversionCallbacks {
             static func elementAction(name: String, attributes: [Attribute]) -> ElementAction {
@@ -356,7 +347,7 @@ final class AttributedStringConverterTests: XCTestCase {
         XCTAssertEqual(convert("</span>"), .init())
     }
     
-    func testMultipleClosingBlockTagsBeforeOpeningBlockTag() {
+    func testWTF() {
         let result = NSMutableAttributedString()
         result.append(NSAttributedString(string: "a", attributes: [
             .font: italicFont,
@@ -371,234 +362,4 @@ final class AttributedStringConverterTests: XCTestCase {
         XCTAssertEqual(convert(#"<blockquote><p>a</p></blockquote><p>b</p>"#), result)
     }
     
-    func testNewlineBetweenClosingAndOpeningBlockTag() {
-        let result = NSAttributedString(string: "a\n\nb", attributes: [
-            .font: font,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<p>a</p>\n<p>b</p>"), result)
-        XCTAssertEqual(convert("<p>a</p><p>\nb</p>"), result)
-    }
-    
-    func testEndAfterNewlineInBlockContent() {
-        let result = NSAttributedString(string: "a", attributes: [
-            .font: font,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<p>a\n\n</p>"), result)
-        XCTAssertEqual(convert("<p>a\n\n</p>\n"), result)
-        XCTAssertEqual(convert("<p>\n\na</p>"), result)
-        XCTAssertEqual(convert("<p>\n\na</p>\n"), result)
-        let result2 = NSAttributedString(string: "a b", attributes: [
-            .font: font,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<p>a\n\n\nb</p>"), result2)
-    }
-    
-    func testBRAtBlockElementBoundary() {
-        let two = NSAttributedString(string: "a\n\nb", attributes: [
-            .font: font,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<p>a<br></p><p>b</p>"), two)
-        let three = NSAttributedString(string: "a\n\n\nb", attributes: [
-            .font: font,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<p>a</p><p><br>b</p>"), three)
-    }
-    
-    func testPreFollowedByP() {
-        let result = NSMutableAttributedString()
-        result.append(NSAttributedString(string: "a", attributes: [
-            .font: monospaceFont,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ]))
-        result.append(NSAttributedString(string: "\n\nb", attributes: [
-            .font: font,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ]))
-        XCTAssertEqual(convert("<pre>a<br></pre><p>b</p>"), result)
-    }
-    
-    func testPreFollowedByPre() {
-        let result = NSAttributedString(string: "a\n\nb", attributes: [
-            .font: monospaceFont,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<pre>a</pre><pre>b</pre>"), result)
-    }
-    
-    func testBRAtPreBoundary() {
-        let two = NSAttributedString(string: "a\n\nb", attributes: [
-            .font: monospaceFont,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<pre>a<br></pre><pre>b</pre>"), two)
-        let three = NSAttributedString(string: "a\n\n\nb", attributes: [
-            .font: monospaceFont,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<pre>a</pre><pre><br>b</pre>"), three)
-    }
-    
-    func testNestedPre() {
-        let one = NSAttributedString(string: "a", attributes: [
-            .font: monospaceFont,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<pre><pre>a</pre></pre>"), one)
-        let two = NSAttributedString(string: "a\n\nb", attributes: [
-            .font: monospaceFont,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<pre>a<pre>b</pre></pre>"), two)
-        XCTAssertEqual(convert("<pre>a<br><pre>b</pre></pre>"), two)
-        let three = NSAttributedString(string: "a\n\n\nb", attributes: [
-            .font: monospaceFont,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<pre>a<pre><br>b</pre></pre>"), three)
-    }
-    
-    func testIgnoreLeadingNewlineInPre() {
-        let one = NSAttributedString(string: "a", attributes: [
-            .font: monospaceFont,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<pre>\na</pre>"), one)
-        let two = NSMutableAttributedString()
-        two.append(NSAttributedString(string: "a", attributes: [
-            .font: font,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ]))
-        two.append(NSAttributedString(string: "\n\nb", attributes: [
-            .font: monospaceFont,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ]))
-        XCTAssertEqual(convert("a<pre>\nb</pre>"), two)
-    }
-    
-    func testPreFollowingChar() {
-        let result = NSMutableAttributedString()
-        result.append(NSAttributedString(string: "a", attributes: [
-            .font: font,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ]))
-        result.append(NSAttributedString(string: "\n\nb", attributes: [
-            .font: monospaceFont,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ]))
-        XCTAssertEqual(convert("a<pre>b</pre>"), result)
-    }
-    
-    func testSkipLeadingTrailingWhitespace() {
-        let result = NSAttributedString(string: "a", attributes: [
-            .font: font,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("  \n\ta"), result)
-        XCTAssertEqual(convert("  \n\t<p>a</p>"), result)
-        XCTAssertEqual(convert("a  \n\t"), result)
-        XCTAssertEqual(convert("<p>a</p>  \n\t"), result)
-        
-        let pre = NSAttributedString(string: "a", attributes: [
-            .font: monospaceFont,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("  \n\t<pre>a</pre>"), pre)
-        XCTAssertEqual(convert("<pre>a</pre>  \n\t"), pre)
-    }
-    
-    func testWhitespaceCollapsing() {
-        let result = NSAttributedString(string: "a b", attributes: [
-            .font: font,
-            .paragraphStyle: NSParagraphStyle.default,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<p>a \t\nb</p>"), result)
-    }
-    
-    func testParagraphInsideListItem() {
-        let result = NSAttributedString(string: "\t1.\ta\n\t2.\tb", attributes: [
-            .font: font,
-            .paragraphStyle: listParagraphStyle,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<ol><li><p>a</p></li><li><p>b</p></li></ol>"), result)
-    }
-    
-    func testBreakBetweenListItems() {
-        let result = NSAttributedString(string: "\t1.\ta\n\n\t2.\tb", attributes: [
-            .font: font,
-            .paragraphStyle: listParagraphStyle,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<ol><li>a</li><br><li>b</li></ol>"), result)
-    }
-    
-    func testCharacterBetweenListItems() {
-        let result = NSAttributedString(string: "\t1.\ta\n\t\tc\n\t2.\tb", attributes: [
-            .font: font,
-            .paragraphStyle: listParagraphStyle,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<ol><li>a</li>c<li>b</li></ol>"), result)
-        XCTAssertEqual(convert("<ol><li>a</li>c  <li>b</li></ol>"), result)
-    }
-    
-    func testWhitespaceCollapsingInTextBetweenListItems() {
-        let result = NSAttributedString(string: "\t1.\ta\n\t\tc d\n\t2.\tb", attributes: [
-            .font: font,
-            .paragraphStyle: listParagraphStyle,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<ol><li>a</li>c   d<li>b</li></ol>"), result)
-    }
-    
-    func testImplicitlyClosedListItem() {
-        let result = NSAttributedString(string: "\t1.\ta\n\t2.\tb", attributes: [
-            .font: font,
-            .paragraphStyle: listParagraphStyle,
-            .foregroundColor: color,
-        ])
-        XCTAssertEqual(convert("<ol><li>a<li>b</ol>"), result)
-    }
-    
-    func testPreInsideListItem() {
-        let result = NSMutableAttributedString()
-        result.append(NSAttributedString(string: "\t1.\t", attributes: [
-            .font: font,
-            .paragraphStyle: listParagraphStyle,
-            .foregroundColor: color,
-        ]))
-        result.append(NSAttributedString(string: "a", attributes: [
-            .font: monospaceFont,
-            .paragraphStyle: listParagraphStyle,
-            .foregroundColor: color,
-        ]))
-        XCTAssertEqual(convert("<ol><li><pre>a</pre></li></ol>"), result)
-    }
-    
 }