Converter for QuillJS notation

packages/notus/lib/convert.dart

@@ -6,8 +6,11 @@
 library notus.convert;
 
 import 'src/convert/markdown.dart';
+import 'src/convert/quill.dart';
 
 export 'src/convert/markdown.dart';
+export 'src/convert/quill.dart';
 
 /// Markdown codec for Notus documents.
 const NotusMarkdownCodec notusMarkdown = NotusMarkdownCodec();
+const NotusQuillCodec notusQuill = NotusQuillCodec();

packages/notus/lib/src/convert/quill.dart

@@ -0,0 +1,115 @@
+// Copyright (c) 2018, the Zefyr project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:convert';
+
+import 'package:quill_delta/quill_delta.dart';
+
+class NotusQuillCodec extends Codec<Delta, Delta> {
+  const NotusQuillCodec();
+
+  @override
+  Converter<Delta, Delta> get decoder => _NotusQuillDecoder();
+
+  @override
+  Converter<Delta, Delta> get encoder => _NotusQuillEncoder();
+}
+
+class _NotusQuillEncoder extends Converter<Delta, Delta> {
+  @override
+  Delta convert(Delta input) {
+    final result = Delta();
+
+    for (final op in input.toList()) {
+      if (!op.isInsert) continue;
+
+      final attributes = <String, dynamic>{};
+      op.attributes?.forEach((String key, dynamic value) {
+        switch (key) {
+          case 'b':
+            attributes['bold'] = value;
+            break;
+          case 'i':
+            attributes['italic'] = value;
+            break;
+          case 'heading':
+            attributes['header'] = value;
+            break;
+          case 'block':
+            if (value == 'ul') {
+              attributes['list'] = 'bullet';
+            } else if (value == 'ol') {
+              attributes['list'] = 'ordered';
+            } else if (value == 'code') {
+              attributes['code-block'] = true;
+            } else if (value == 'quote') {
+              attributes['blockquote'] = true;
+            } else {
+              attributes[key] = value;
+            }
+            break;
+          case 'a':
+            attributes['link'] = value;
+            break;
+          default:
+            attributes[key] = value;
+        }
+      });
+      result.insert(op.data, attributes.isEmpty ? null : attributes);
+    }
+    return result;
+  }
+}
+
+class _NotusQuillDecoder extends Converter<Delta, Delta> {
+  @override
+  Delta convert(Delta input) {
+    final result = Delta();
+
+    for (final op in input.toList()) {
+      if (!op.isInsert) continue;
+
+      final attributes = <String, dynamic>{};
+      op.attributes?.forEach((String key, dynamic value) {
+        switch (key) {
+          case 'bold':
+            attributes['b'] = value;
+            break;
+          case 'italic':
+            attributes['i'] = value;
+            break;
+          case 'header':
+            attributes['heading'] = value;
+            break;
+          case 'list':
+            if (value == 'bullet') {
+              attributes['block'] = 'ul';
+            } else if (value == 'ordered') {
+              attributes['block'] = 'ol';
+            } else {
+              attributes[key] = value;
+            }
+            break;
+          case 'link':
+            attributes['a'] = value;
+            break;
+          case 'code-block':
+            if (value == true) {
+              attributes['block'] = 'code';
+            }
+            break;
+          case 'blockquote':
+            if (value == true) {
+              attributes['block'] = 'quote';
+            }
+            break;
+          default:
+            attributes[key] = value;
+        }
+      });
+      result.insert(op.data, attributes.isEmpty ? null : attributes);
+    }
+    return result;
+  }
+}

packages/notus/test/convert/quill_test.dart

@@ -0,0 +1,34 @@
+// Copyright (c) 2018, the Zefyr project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+import 'dart:convert';
+
+import 'package:notus/convert.dart';
+import 'package:quill_delta/quill_delta.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('$NotusQuillCodec.encode', () {
+    test('Should return correct string', () {
+      var result = notusQuill.encode(notus_doc);
+
+      expect(jsonEncode(result.toJson()), quill_string);
+    });
+  });
+
+  group('$NotusQuillCodec.decode', () {
+    test('Should return correct string', () {
+      var result = notusQuill.decode(quill_doc);
+
+      expect(jsonEncode(result.toJson()), notus_string);
+    });
+  });
+}
+
+final notus_string =
+    r'[{"insert":"Zefyr"},{"insert":"\n","attributes":{"heading":1}},{"insert":"Soft and gentle rich text editing for Flutter applications.","attributes":{"i":true}},{"insert":"\nZefyr is an "},{"insert":"early preview","attributes":{"b":true}},{"insert":" open source library.\nDocumentation"},{"insert":"\n","attributes":{"heading":3}},{"insert":"Quick Start"},{"insert":"\n","attributes":{"block":"ul"}},{"insert":"Data format and Document Model"},{"insert":"\n","attributes":{"block":"ul"}},{"insert":"Style attributes"},{"insert":"\n","attributes":{"block":"ul"}},{"insert":"Heuristic rules"},{"insert":"\n","attributes":{"block":"ol"}},{"insert":"Clean and modern look"},{"insert":"\n","attributes":{"heading":2}},{"insert":"Zefyr’s rich text editor is built with simplicity and flexibility in mind. It provides clean interface for distraction-free editing. Think Medium.com-like experience.\nimport ‘package:flutter/material.dart’;"},{"insert":"\n","attributes":{"block":"code"}},{"insert":"import ‘package:notus/notus.dart’;"},{"insert":"\n\n","attributes":{"block":"code"}},{"insert":"void main() {"},{"insert":"\n","attributes":{"block":"code"}},{"insert":" print(“Hello world!”);"},{"insert":"\n","attributes":{"block":"code"}},{"insert":"}"},{"insert":"\n","attributes":{"block":"code"}}]';
+final notus_doc = Delta.fromJson(json.decode(notus_string) as List);
+
+final quill_string =
+    r'[{"insert":"Zefyr"},{"insert":"\n","attributes":{"header":1}},{"insert":"Soft and gentle rich text editing for Flutter applications.","attributes":{"italic":true}},{"insert":"\nZefyr is an "},{"insert":"early preview","attributes":{"bold":true}},{"insert":" open source library.\nDocumentation"},{"insert":"\n","attributes":{"header":3}},{"insert":"Quick Start"},{"insert":"\n","attributes":{"list":"bullet"}},{"insert":"Data format and Document Model"},{"insert":"\n","attributes":{"list":"bullet"}},{"insert":"Style attributes"},{"insert":"\n","attributes":{"list":"bullet"}},{"insert":"Heuristic rules"},{"insert":"\n","attributes":{"list":"ordered"}},{"insert":"Clean and modern look"},{"insert":"\n","attributes":{"header":2}},{"insert":"Zefyr’s rich text editor is built with simplicity and flexibility in mind. It provides clean interface for distraction-free editing. Think Medium.com-like experience.\nimport ‘package:flutter/material.dart’;"},{"insert":"\n","attributes":{"code-block":true}},{"insert":"import ‘package:notus/notus.dart’;"},{"insert":"\n\n","attributes":{"code-block":true}},{"insert":"void main() {"},{"insert":"\n","attributes":{"code-block":true}},{"insert":" print(“Hello world!”);"},{"insert":"\n","attributes":{"code-block":true}},{"insert":"}"},{"insert":"\n","attributes":{"code-block":true}}]';
+final quill_doc = Delta.fromJson(json.decode(notus_string) as List);