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feat: converter

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This commit is contained in:
Vincent Chan 2022-08-10 13:32:27 +08:00
parent 4140994fed
commit e606306635
1 changed files with 25 additions and 50 deletions
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75
frontend/app_flowy/packages/flowy_editor/lib/infra/html_converter.dart
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@ -230,78 +230,53 @@ class HTMLToNodesConverter {
}
}
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 html.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;
}
}
class NodesToHTMLConverter {
final List<Node> nodes;
final int? startOffset;
final int? endOffset;
final List<html.Node> _result = [];
html.Element? _stashListContainer;
NodesToHTMLConverter({required this.nodes, this.startOffset, this.endOffset});
List<html.Node> toHTMLNodes() {
final result = <html.Node>[];
for (final node in nodes) {
if (node.type == "text") {
final textNode = node as TextNode;
if (node == nodes.first) {
result.add(_textNodeToHtml(textNode));
_addTextNode(textNode);
} else if (node == nodes.last) {
result.add(_textNodeToHtml(textNode, end: endOffset));
_addTextNode(textNode, end: endOffset);
} else {
result.add(_textNodeToHtml(textNode));
_addTextNode(textNode);
}
}
// TODO: handle image and other blocks
}
return result;
return _result;
}
_addTextNode(TextNode textNode, {int? end}) {
_addElement(textNode, _textNodeToHtml(textNode, end: end));
}
_addElement(TextNode textNode, html.Element element) {
if (element.localName == tagList) {
final isNumbered = textNode.attributes["subtype"] == StyleKey.numberList;
_stashListContainer ??= html.Element.tag(isNumbered ? "ol" : "ul");
_stashListContainer?.append(element);
} else {
if (_stashListContainer != null) {
_result.add(_stashListContainer!);
_stashListContainer = null;
}
_result.add(element);
}
}
String toHTMLString() {
final elements = toHTMLNodes();
final copyString = _HTMLNormalizer(elements).normalize().fold<String>(
final copyString = elements.fold<String>(
"", ((previousValue, element) => previousValue + stringify(element)));
return copyString;
}