feat: add stringify tag

frontend/app_flowy/packages/flowy_editor/lib/infra/html_converter.dart

@@ -4,6 +4,7 @@ import 'package:flowy_editor/document/attributes.dart';
 import 'package:flowy_editor/document/node.dart';
 import 'package:flowy_editor/document/text_delta.dart';
 import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
 import 'package:html/parser.dart' show parse;
 import 'package:html/dom.dart' as html;
 
@@ -205,20 +206,58 @@ class HTMLConverter {
   }
 }
 
-String deltaToHtml(Delta delta) {
-  var result = "<p>";
+html.Element deltaToHtml(Delta delta, [String? subType]) {
+  final childNodes = <html.Node>[];
+  String tagName = tagParagraph;
+
+  if (subType == "bulleted-list") {
+    tagName = tagList;
+  }
 
   for (final op in delta.operations) {
     if (op is TextInsert) {
       final attributes = op.attributes;
       if (attributes != null && attributes["bold"] == true) {
-        result += '<strong>${op.content}</strong>';
+        final strong = html.Element.tag("strong");
+        strong.append(html.Text(op.content));
+        childNodes.add(strong);
       } else {
-        result += op.content;
+        childNodes.add(html.Text(op.content));
       }
     }
   }
 
-  result += "</p>";
-  return result;
+  if (tagName != tagParagraph) {
+    final p = html.Element.tag(tagParagraph);
+    for (final node in childNodes) {
+      p.append(node);
+    }
+    final result = html.Element.tag("li");
+    result.append(p);
+    return result;
+  } else {
+    final p = html.Element.tag(tagName);
+    for (final node in childNodes) {
+      p.append(node);
+    }
+    return p;
+  }
+}
+
+String stringify(html.Node node) {
+  if (node is html.Element) {
+    String result = '<${node.localName}>';
+
+    for (final node in node.nodes) {
+      result += stringify(node);
+    }
+
+    return result += '</${node.localName}>';
+  }
+
+  if (node is html.Text) {
+    return node.text;
+  }
+
+  return "";
 }

frontend/app_flowy/packages/flowy_editor/lib/service/internal_key_event_handlers/copy_paste_handler.dart

@@ -1,3 +1,4 @@
+import 'package:html/dom.dart' as html;
 import 'package:flowy_editor/flowy_editor.dart';
 import 'package:flowy_editor/service/keyboard_service.dart';
 import 'package:flowy_editor/infra/html_converter.dart';
@@ -6,6 +7,50 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:rich_clipboard/rich_clipboard.dart';
 
+class _HTMLNormalizer {
+  final List<html.Node> nodes;
+  html.Element? _pendingList;
+
+  _HTMLNormalizer(this.nodes);
+
+  List<html.Node> normalize() {
+    final result = <html.Node>[];
+
+    for (final item in nodes) {
+      if (item is Text) {
+        result.add(item);
+        continue;
+      }
+
+      if (item is html.Element) {
+        if (item.localName == "li") {
+          if (_pendingList != null) {
+            _pendingList!.append(item);
+          } else {
+            final ulItem = html.Element.tag("ul");
+            ulItem.append(item);
+
+            _pendingList = ulItem;
+          }
+        } else {
+          _pushList(result);
+          result.add(item);
+        }
+      }
+    }
+
+    return result;
+  }
+
+  _pushList(List<html.Node> result) {
+    if (_pendingList == null) {
+      return;
+    }
+    result.add(_pendingList!);
+    _pendingList = null;
+  }
+}
+
 _handleCopy(EditorState editorState) async {
   final selection = editorState.cursorSelection;
   if (selection == null || selection.isCollapsed) {
@@ -18,7 +63,7 @@ _handleCopy(EditorState editorState) async {
       final delta =
           textNode.delta.slice(selection.start.offset, selection.end.offset);
 
-      final htmlString = deltaToHtml(delta);
+      final htmlString = stringify(deltaToHtml(delta));
       debugPrint('copy html: $htmlString');
       RichClipboard.setData(RichClipboardData(html: htmlString));
     } else {
@@ -31,27 +76,30 @@ _handleCopy(EditorState editorState) async {
   final endNode = editorState.document.nodeAtPath(selection.end.path)!;
   final traverser = NodeIterator(editorState.document, beginNode, endNode);
 
-  var copyString = "";
+  final nodes = <html.Node>[];
   while (traverser.moveNext()) {
     final node = traverser.current;
     if (node.type == "text") {
       final textNode = node as TextNode;
+      String? subType = textNode.attributes["subtype"];
       if (node == beginNode) {
-        final htmlString =
-            deltaToHtml(textNode.delta.slice(selection.start.offset));
-        copyString += htmlString;
+        final htmlElement =
+            deltaToHtml(textNode.delta.slice(selection.start.offset), subType);
+        nodes.add(htmlElement);
       } else if (node == endNode) {
-        final htmlString =
-            deltaToHtml(textNode.delta.slice(0, selection.end.offset));
-        copyString += htmlString;
+        final htmlElement =
+            deltaToHtml(textNode.delta.slice(0, selection.end.offset), subType);
+        nodes.add(htmlElement);
       } else {
-        final htmlString = deltaToHtml(textNode.delta);
-        copyString += htmlString;
+        final htmlElement = deltaToHtml(textNode.delta, subType);
+        nodes.add(htmlElement);
       }
     }
     // TODO: handle image and other blocks
-
   }
+
+  final copyString = _HTMLNormalizer(nodes).normalize().fold<String>(
+      "", ((previousValue, element) => previousValue + stringify(element)));
   debugPrint('copy html: $copyString');
   RichClipboard.setData(RichClipboardData(html: copyString));
 }