Add local storage for snippets and fix serialisation

lib/src/home/models/char_model.dart

@@ -1,8 +1,7 @@
-import 'dart:convert';
-
 import 'package:freezed_annotation/freezed_annotation.dart';
 
 part 'char_model.freezed.dart';
+part 'char_model.g.dart';
 
 @freezed
 class CharModel with _$CharModel {
@@ -11,30 +10,7 @@ class CharModel with _$CharModel {
     required String value,
     required int length,
   }) = _CharModel;
-}
-
-extension CharModelSerialisable on CharModel {
-  static List<CharModel> fromJsonString(String json) {
-    final List list = const JsonDecoder().convert(json);
-    return list
-        .map(
-          (e) => CharModel(
-            name: e['name'],
-            value: e['value'],
-            length: e['length'],
-          ),
-        )
-        .toList();
-  }
 
-  static String toJsonString(List<CharModel> list) {
-    final json = list.map(
-      (e) => {
-        'name': e.name,
-        'value': e.value,
-        'length': e.length,
-      },
-    );
-    return const JsonEncoder().convert(json);
-  }
+  factory CharModel.fromJson(Map<String, dynamic> json) =>
+      _$CharModelFromJson(json);
 }

lib/src/home/models/char_model.freezed.dart

@@ -14,12 +14,17 @@ T _$identity<T>(T value) => value;
 final _privateConstructorUsedError = UnsupportedError(
     'It seems like you constructed your class using `MyClass._()`. This constructor is only meant to be used by freezed and you are not supposed to need it nor use it.\nPlease check the documentation here for more information: https://github.com/rrousselGit/freezed#custom-getters-and-methods');
 
+CharModel _$CharModelFromJson(Map<String, dynamic> json) {
+  return _CharModel.fromJson(json);
+}
+
 /// @nodoc
 mixin _$CharModel {
   String get name => throw _privateConstructorUsedError;
   String get value => throw _privateConstructorUsedError;
   int get length => throw _privateConstructorUsedError;
 
+  Map<String, dynamic> toJson() => throw _privateConstructorUsedError;
   @JsonKey(ignore: true)
   $CharModelCopyWith<CharModel> get copyWith =>
       throw _privateConstructorUsedError;
@@ -106,11 +111,14 @@ class __$$_CharModelCopyWithImpl<$Res> extends _$CharModelCopyWithImpl<$Res>
 }
 
 /// @nodoc
-
+@JsonSerializable()
 class _$_CharModel implements _CharModel {
   const _$_CharModel(
       {required this.name, required this.value, required this.length});
 
+  factory _$_CharModel.fromJson(Map<String, dynamic> json) =>
+      _$$_CharModelFromJson(json);
+
   @override
   final String name;
   @override
@@ -133,6 +141,7 @@ class _$_CharModel implements _CharModel {
             const DeepCollectionEquality().equals(other.length, length));
   }
 
+  @JsonKey(ignore: true)
   @override
   int get hashCode => Object.hash(
       runtimeType,
@@ -144,6 +153,13 @@ class _$_CharModel implements _CharModel {
   @override
   _$$_CharModelCopyWith<_$_CharModel> get copyWith =>
       __$$_CharModelCopyWithImpl<_$_CharModel>(this, _$identity);
+
+  @override
+  Map<String, dynamic> toJson() {
+    return _$$_CharModelToJson(
+      this,
+    );
+  }
 }
 
 abstract class _CharModel implements CharModel {
@@ -152,6 +168,9 @@ abstract class _CharModel implements CharModel {
       required final String value,
       required final int length}) = _$_CharModel;
 
+  factory _CharModel.fromJson(Map<String, dynamic> json) =
+      _$_CharModel.fromJson;
+
   @override
   String get name;
   @override

lib/src/home/providers/editor_provider.dart

@@ -99,9 +99,10 @@ class _EditorContentModel extends StateNotifier<String> {
   }
 
   void addContent(String content, TextPosition pos) {
-    state = state.substring(0, pos.offset) +
+    final offset = pos.offset == -1 ? 0 : pos.offset;
+    state = state.substring(0, offset) +
         content +
-        state.substring(pos.offset, state.length);
+        state.substring(offset, state.length);
   }
 
   void replaceAll(String old, String new_) {

lib/src/home/services/snippet_service.dart

@@ -3,21 +3,25 @@ import 'package:excode/src/home/models/char_model.dart';
 
 class SnippetService {
   static Future<void> store({required List<CharModel> data}) async {
-    await box.put('snippetList', CharModelSerialisable.toJsonString(data));
+    await box.put('snippetList', data.map((e) => e.toJson()).toList());
   }
 
   static List<CharModel> fetch() {
-    return CharModelSerialisable.fromJsonString(
-      box.get('snippetList') ??
-          '''[
-          {"name": "( )", "value": "()", "length": 1},
-          {"name": "{ }", "value": "{}", "length": 1},
-          {"name": "[ ]", "value": "[]", "length": 1},
-          {"name": "\\"", "value": "\\"\\"", "length": 1},
-          {"name": "'", "value": "''", "length": 1},
-          {"name": "`", "value": "``", "length": 1},
-          {"name": "< >", "value": "<>", "length": 1}
-        ]''',
-    );
+    final List<dynamic>? dynamicList = box.get('snippetList');
+
+    final storedCharList = dynamicList
+        ?.map((e) => CharModel.fromJson(Map<String, dynamic>.from(e)))
+        .toList();
+
+    return storedCharList ??
+        [
+          {'name': '( )', 'value': '()', 'length': 1},
+          {'name': '{ }', 'value': '{}', 'length': 1},
+          {'name': '[ ]', 'value': '[]', 'length': 1},
+          {'name': '\\', 'value': '\\', 'length': 1},
+          {'name': "'", 'value': "''", 'length': 1},
+          {'name': '`', 'value': '``', 'length': 1},
+          {'name': '< >', 'value': '<>', 'length': 1},
+        ].map((e) => CharModel.fromJson(e)).toList();
   }
 }

lib/src/home/widgets/code_field.dart

@@ -199,11 +199,12 @@ class CodeFieldWidgetState extends State<CodeFieldWidget> {
   }
 
   void _updateLineNumber() {
+    final offset = widget.controller.selection.base.offset;
     setState(() {
       _selectedLine = '\n'
               .allMatches(widget.controller.text.substring(
                 0,
-                widget.controller.selection.base.offset,
+                offset,
               ))
               .length +
           1;

pubspec.lock

@@ -538,7 +538,14 @@ packages:
       name: json_annotation
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.6.0"
+    version: "4.7.0"
+  json_serializable:
+    dependency: "direct dev"
+    description:
+      name: json_serializable
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.5.4"
   jwt_decode:
     dependency: transitive
     description:
@@ -880,6 +887,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.2"
+  source_helper:
+    dependency: transitive
+    description:
+      name: source_helper
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.3"
   source_span:
     dependency: transitive
     description:

pubspec.yaml

@@ -50,6 +50,7 @@ dev_dependencies:
 
   flutter_lints: ^1.0.0
   freezed: ^2.0.3+1
+  json_serializable: ^6.5.4
 
 flutter:
   uses-material-design: true