Ignore HTML in flutter_markdown content without error (#8420)

* Gracefully ignore html content

* Test for less than, consolidate table tests

* Specify missing type annotation

* Add Mike Hoolehan to AUTHORS

AUTHORS

@@ -14,3 +14,4 @@ Michael Beckler <mcbeckler@gmail.com>
 Alexandre Ardhuin <alexandre.ardhuin@gmail.com>
 Luke Freeman <luke@goposse.com>
 Vincent Le Quéméner <eu.lequem@gmail.com>
+Mike Hoolehan <mike@hoolehan.com>

packages/flutter_markdown/lib/src/markdown_raw.dart

@@ -219,13 +219,16 @@ class _Renderer implements md.NodeVisitor {
 
   @override
   void visitText(md.Text text) {
-    _MarkdownNodeList topList = _currentBlock.stack.last;
-    List<_MarkdownNode> top = topList.list;
+    if (_currentBlock != null) { // ignore if no corresponding block
+      _MarkdownNodeList topList = _currentBlock.stack.last;
+      List<_MarkdownNode> top = topList.list;
 
-    if (_currentBlock.tag == 'pre')
-      top.add(new _MarkdownNodeTextSpan(_syntaxHighlighter.format(text.text)));
-    else
-      top.add(new _MarkdownNodeString(text.text));
+      if (_currentBlock.tag == 'pre')
+        top.add(
+            new _MarkdownNodeTextSpan(_syntaxHighlighter.format(text.text)));
+      else
+        top.add(new _MarkdownNodeString(text.text));
+    }
   }
 
   @override

packages/flutter_markdown/pubspec.yaml

@@ -7,7 +7,7 @@ homepage: http://flutter.io
 dependencies:
   flutter:
     sdk: flutter
-  markdown: '^0.9.0'
+  markdown: '^0.11.0'
   string_scanner: ^1.0.0
 
 dev_dependencies:

packages/flutter_markdown/test/flutter_markdown_test.dart

@@ -84,6 +84,28 @@ void main() {
       expect(span.children[0].recognizer.runtimeType, equals(TapGestureRecognizer));
   });
 
+  testWidgets('HTML tag ignored ', (WidgetTester tester) async {
+    final List<String> mdData = <String>[
+      'Line 1\n<p>HTML content</p>\nLine 2',
+      'Line 1\n<!-- HTML\n comment\n ignored --><\nLine 2'
+    ];
+
+    for (String mdLine in mdData) {
+      await tester.pumpWidget(new MarkdownBody(data: mdLine));
+
+          Iterable<Widget> widgets = tester.allWidgets;
+          _expectTextStrings(widgets, <String>['Line 1', 'Line 2']);
+    }
+  });
+
+  testWidgets('Less than', (WidgetTester tester) async {
+      final String mdLine = 'Line 1 <\n\nc < c c\n\n< Line 2';
+      await tester.pumpWidget(new MarkdownBody(data: mdLine));
+
+      Iterable<Widget> widgets = tester.allWidgets;
+      _expectTextStrings(widgets, <String>['Line 1 &lt;','c &lt; c c','&lt; Line 2']);
+  });
+
   testWidgets('Changing config - data', (WidgetTester tester) async {
       await tester.pumpWidget(new Markdown(data: 'Data1'));
       _expectTextStrings(tester.allWidgets, <String>['Data1']);