mirror of
https://github.com/GitJournal/GitJournal.git
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64faba451e
This is serializing it into bytes via protobuf. The idea is to avoid the expensive parsing of the markdown multiple times, and instead just cache the result.
66 lines
1.5 KiB
Dart
66 lines
1.5 KiB
Dart
/*
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* SPDX-FileCopyrightText: 2019-2021 Vishesh Handa <me@vhanda.in>
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*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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import 'dart:typed_data';
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import 'package:markdown/markdown.dart' as md;
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import 'generated/markdown.pb.dart' as pb;
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class MarkdownCodec {
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static Uint8List encode(List<md.Node> nodes) {
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var pbNodes = pb.NodeList(node: nodes.map(_encode).toList());
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return pbNodes.writeToBuffer();
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}
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static List<md.Node> decode(List<int> bytes) {
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var nodes = pb.NodeList.fromBuffer(bytes);
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return nodes.node.map(_decode).toList();
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}
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}
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pb.Node _encode(md.Node mdNode) {
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if (mdNode is md.Text) {
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return pb.Node(text: mdNode.text);
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}
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if (mdNode is md.Element) {
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var node = pb.Node(
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element: pb.Element(
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tag: mdNode.tag,
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attributes: mdNode.attributes,
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children: mdNode.children?.map(_encode),
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generatedId: mdNode.generatedId,
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),
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);
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return node;
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}
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throw Exception("Markdown Node of Invalid Type");
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}
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md.Node _decode(pb.Node pbNode) {
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if (pbNode.hasText()) {
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return md.Text(pbNode.text);
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}
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if (pbNode.hasElement()) {
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var pbElem = pbNode.element;
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var children = pbElem.children.map(_decode).toList();
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var elem = md.Element(pbElem.tag, children.isEmpty ? null : children);
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elem.attributes.addAll(pbElem.attributes);
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if (pbElem.hasGeneratedId()) {
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elem.generatedId = pbElem.generatedId;
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}
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return elem;
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}
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throw Exception("Markdown Protobuf Node of Invalid Type");
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}
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// TODO: Use protobuf.omit_field_names?
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