feat: null safety

Author: pd4d10

.prettierrc

@@ -0,0 +1,3 @@
+{
+  "proseWrap": "never"
+}

README.md

@@ -1,14 +1,14 @@
-# highlight
+# highlight.dart
 
 Syntax highlighting for Dart and Flutter, which supports lots of languages and themes.
 
 [View gallery built with Flutter web](https://git-touch.github.io/highlight/)
 
-| Package                                                                                | Version                                                                                              | Description                                      |
-| -------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------- | ------------------------------------------------ |
-| [highlight](https://github.com/pd4d10/highlight/tree/master/highlight)                 | [![pub](https://img.shields.io/pub/v/highlight)](https://pub.dev/packages/highlight)                 | Core syntax highlighting library written in Dart |
-| [flutter_highlight](https://github.com/pd4d10/highlight/tree/master/flutter_highlight) | [![pub](https://img.shields.io/pub/v/flutter_highlight)](https://pub.dev/packages/flutter_highlight) | Flutter syntax highlighting widget               |
-|                                                                                        |
+| Package | Version | Description |
+| --- | --- | --- |
+| [highlight](https://github.com/pd4d10/highlight/tree/master/highlight) | [![pub](https://img.shields.io/pub/v/highlight)](https://pub.dev/packages/highlight) | Core syntax highlighting library written in Dart |
+| [flutter_highlight](https://github.com/pd4d10/highlight/tree/master/flutter_highlight) | [![pub](https://img.shields.io/pub/v/flutter_highlight)](https://pub.dev/packages/flutter_highlight) | Flutter syntax highlighting widget |
+|  |
 
 ## References
 

flutter_highlight/example/pubspec.yaml

@@ -19,7 +19,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  url_launcher: ^5.4.1
+  url_launcher: ^6.0.2
   flutter_highlight:
     path: ../
 

flutter_highlight/lib/flutter_highlight.dart

@@ -12,20 +12,20 @@ class HighlightView extends StatelessWidget {
   /// It is recommended to give it a value for performance
   ///
   /// [All available languages](https://github.com/pd4d10/highlight/tree/master/highlight/lib/languages)
-  final String language;
+  final String? language;
 
   /// Highlight theme
   ///
   /// [All available themes](https://github.com/pd4d10/highlight/blob/master/flutter_highlight/lib/themes)
   final Map<String, TextStyle> theme;
 
   /// Padding
-  final EdgeInsetsGeometry padding;
+  final EdgeInsetsGeometry? padding;
 
   /// Text styles
   ///
   /// Specify text styles such as font family and font size
-  final TextStyle textStyle;
+  final TextStyle? textStyle;
 
   HighlightView(
     String input, {
@@ -45,16 +45,16 @@ class HighlightView extends StatelessWidget {
       if (node.value != null) {
         currentSpans.add(node.className == null
             ? TextSpan(text: node.value)
-            : TextSpan(text: node.value, style: theme[node.className]));
+            : TextSpan(text: node.value, style: theme[node.className!]));
       } else if (node.children != null) {
         List<TextSpan> tmp = [];
-        currentSpans.add(TextSpan(children: tmp, style: theme[node.className]));
+        currentSpans.add(TextSpan(children: tmp, style: theme[node.className!]));
         stack.add(currentSpans);
         currentSpans = tmp;
 
-        node.children.forEach((n) {
+        node.children!.forEach((n) {
           _traverse(n);
-          if (n == node.children.last) {
+          if (n == node.children!.last) {
             currentSpans = stack.isEmpty ? spans : stack.removeLast();
           }
         });
@@ -93,7 +93,7 @@ class HighlightView extends StatelessWidget {
       child: RichText(
         text: TextSpan(
           style: _textStyle,
-          children: _convert(highlight.parse(source, language: language).nodes),
+          children: _convert(highlight.parse(source, language: language).nodes!),
         ),
       ),
     );

flutter_highlight/pubspec.yaml

@@ -1,11 +1,10 @@
 name: flutter_highlight
 description: Syntax highlighting widget for Flutter with lots of languages and themes support.
 version: 0.6.0+1
-author: Rongjian Zhang <pd4d10@gmail.com>
 homepage: https://github.com/git-touch/highlight
 
 environment:
-  sdk: ">=2.3.0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   flutter: