Issue192 paired symbols, issue199 yaml support [origin: @Malarg]

example/lib/03.change_language_theme/constants.dart

@@ -4,6 +4,7 @@ import 'package:highlight/languages/java.dart';
 import 'package:highlight/languages/php.dart';
 import 'package:highlight/languages/python.dart';
 import 'package:highlight/languages/scala.dart';
+import 'package:highlight/languages/yaml.dart';
 
 final builtinLanguages = {
   'dart': dart,
@@ -12,6 +13,7 @@ final builtinLanguages = {
   'php': php,
   'python': python,
   'scala': scala,
+  'yaml': yaml,
 };
 
 const languageList = <String>[
@@ -21,6 +23,7 @@ const languageList = <String>[
   'php',
   'python',
   'scala',
+  'yaml',
 ];
 
 const themeList = <String>[

lib/src/code_field/actions/tab.dart

@@ -0,0 +1,21 @@
+import 'package:flutter/material.dart';
+
+import '../code_controller.dart';
+
+class TabKeyIntent extends Intent {
+  const TabKeyIntent();
+}
+
+class TabKeyAction extends Action<TabKeyIntent> {
+  final CodeController controller;
+
+  TabKeyAction({
+    required this.controller,
+  });
+
+  @override
+  Object? invoke(TabKeyIntent intent) {
+    controller.onTabKeyAction();
+    return null;
+  }
+}

lib/src/code_field/code_controller.dart

@@ -12,13 +12,15 @@ import '../../flutter_code_editor.dart';
 import '../autocomplete/autocompleter.dart';
 import '../code/code_edit_result.dart';
 import '../code/key_event.dart';
+import '../code_modifiers/insertion.dart';
 import '../history/code_history_controller.dart';
 import '../history/code_history_record.dart';
 import '../search/controller.dart';
 import '../search/result.dart';
 import '../search/search_navigation_controller.dart';
 import '../search/settings_controller.dart';
 import '../single_line_comments/parser/single_line_comments.dart';
+import '../util/string_util.dart';
 import '../wip/autocomplete/popup_controller.dart';
 import 'actions/comment_uncomment.dart';
 import 'actions/copy.dart';
@@ -28,6 +30,7 @@ import 'actions/indent.dart';
 import 'actions/outdent.dart';
 import 'actions/redo.dart';
 import 'actions/search.dart';
+import 'actions/tab.dart';
 import 'actions/undo.dart';
 import 'search_result_highlighted_builder.dart';
 import 'span_builder.dart';
@@ -50,6 +53,7 @@ class CodeController extends TextEditingController {
   /// Calls [AbstractAnalyzer.analyze] after change with 500ms debounce.
   AbstractAnalyzer get analyzer => _analyzer;
   AbstractAnalyzer _analyzer;
+
   set analyzer(AbstractAnalyzer analyzer) {
     if (_analyzer == analyzer) {
       return;
@@ -107,6 +111,7 @@ class CodeController extends TextEditingController {
 
   SearchSettingsController get _searchSettingsController =>
       searchController.settingsController;
+
   SearchNavigationController get _searchNavigationController =>
       searchController.navigationController;
 
@@ -130,8 +135,21 @@ class CodeController extends TextEditingController {
     SearchIntent: SearchAction(controller: this),
     DismissIntent: CustomDismissAction(controller: this),
     EnterKeyIntent: EnterKeyAction(controller: this),
+    TabKeyIntent: TabKeyAction(controller: this),
   };
 
+  static const defaultCodeModifiers = [
+    IndentModifier(),
+    CloseBlockModifier(),
+    TabModifier(),
+    InsertionCodeModifier.backticks,
+    InsertionCodeModifier.braces,
+    InsertionCodeModifier.brackets,
+    InsertionCodeModifier.doubleQuotes,
+    InsertionCodeModifier.parentheses,
+    InsertionCodeModifier.singleQuotes,
+  ];
+
   CodeController({
     String? text,
     Mode? language,
@@ -143,11 +161,7 @@ class CodeController extends TextEditingController {
     this.patternMap,
     this.readOnly = false,
     this.params = const EditorParams(),
-    this.modifiers = const [
-      IndentModifier(),
-      CloseBlockModifier(),
-      TabModifier(),
-    ],
+    this.modifiers = defaultCodeModifiers,
   })  : _analyzer = analyzer,
         _readOnlySectionNames = readOnlySectionNames,
         _code = Code.empty,
@@ -347,30 +361,60 @@ class CodeController extends TextEditingController {
     insertStr('\n');
   }
 
+  void onTabKeyAction() {
+    if (popupController.shouldShow) {
+      insertSelectedWord();
+      return;
+    }
+
+    insertStr(' ' * params.tabSpaces);
+  }
+
   /// Inserts the word selected from the list of completions
   void insertSelectedWord() {
     final previousSelection = selection;
     final selectedWord = popupController.getSelectedWord();
     final startPosition = value.wordAtCursorStart;
+    final currentWord = value.wordAtCursor;
 
-    if (startPosition != null) {
-      final replacedText = text.replaceRange(
-        startPosition,
-        selection.baseOffset,
-        selectedWord,
-      );
+    if (startPosition == null || currentWord == null) {
+      popupController.hide();
+      return;
+    }
 
-      final adjustedSelection = previousSelection.copyWith(
-        baseOffset: startPosition + selectedWord.length,
-        extentOffset: startPosition + selectedWord.length,
-      );
+    final endReplacingPosition = startPosition + currentWord.length;
+    final endSelectionPosition = startPosition + selectedWord.length;
 
-      value = TextEditingValue(
-        text: replacedText,
-        selection: adjustedSelection,
-      );
+    var additionalSpaceIfEnd = '';
+    var offsetIfEndsWithSpace = 1;
+    if (text.length < endReplacingPosition + 1) {
+      additionalSpaceIfEnd = ' ';
+    } else {
+      final charAfterText = text[endReplacingPosition];
+      if (charAfterText != ' ' &&
+          !StringUtil.isDigit(charAfterText) &&
+          !StringUtil.isLetterEng(charAfterText)) {
+        // ex. case ';' or other finalizer, or symbol
+        offsetIfEndsWithSpace = 0;
+      }
     }
 
+    final replacedText = text.replaceRange(
+      startPosition,
+      endReplacingPosition,
+      '$selectedWord$additionalSpaceIfEnd',
+    );
+
+    final adjustedSelection = previousSelection.copyWith(
+      baseOffset: endSelectionPosition + offsetIfEndsWithSpace,
+      extentOffset: endSelectionPosition + offsetIfEndsWithSpace,
+    );
+
+    value = TextEditingValue(
+      text: replacedText,
+      selection: adjustedSelection,
+    );
+
     popupController.hide();
   }
 

lib/src/code_field/code_field.dart

@@ -15,6 +15,7 @@ import 'actions/enter_key.dart';
 import 'actions/indent.dart';
 import 'actions/outdent.dart';
 import 'actions/search.dart';
+import 'actions/tab.dart';
 import 'code_controller.dart';
 import 'default_styles.dart';
 import 'js_workarounds/js_workarounds.dart';
@@ -110,6 +111,11 @@ final _shortcuts = <ShortcutActivator, Intent>{
   LogicalKeySet(
     LogicalKeyboardKey.enter,
   ): const EnterKeyIntent(),
+
+  // TabKey
+  LogicalKeySet(
+    LogicalKeyboardKey.tab,
+  ): const TabKeyIntent(),
 };
 
 class CodeField extends StatefulWidget {

lib/src/code_modifiers/close_block_code_modifier.dart

@@ -5,6 +5,8 @@ import 'package:flutter/widgets.dart';
 import '../code_field/editor_params.dart';
 import 'code_modifier.dart';
 
+/// [CloseBlockModifier] is an implementation of [CodeModifier]
+/// that remove spaces before the closing bracket, if required.
 class CloseBlockModifier extends CodeModifier {
   const CloseBlockModifier() : super('}');
 

lib/src/code_modifiers/code_modifier.dart

@@ -7,7 +7,7 @@ abstract class CodeModifier {
 
   const CodeModifier(this.char);
 
-  // Helper to insert [str] in [text] between [start] and [end]
+  /// Helper to insert [str] in [text] between [start] and [end]
   TextEditingValue replace(String text, int start, int end, String str) {
     final len = str.length;
     return TextEditingValue(

lib/src/code_modifiers/insertion.dart

@@ -0,0 +1,47 @@
+import 'package:flutter/services.dart';
+
+import '../code_field/editor_params.dart';
+import 'code_modifier.dart';
+
+class InsertionCodeModifier extends CodeModifier {
+  final String openChar;
+  final String closeString;
+
+  const InsertionCodeModifier({
+    required this.openChar,
+    required this.closeString,
+  }) : super(openChar);
+
+  static const backticks =
+      InsertionCodeModifier(openChar: '`', closeString: '`');
+
+  static const braces = InsertionCodeModifier(openChar: '{', closeString: '}');
+
+  static const brackets =
+      InsertionCodeModifier(openChar: '[', closeString: ']');
+
+  static const doubleQuotes =
+      InsertionCodeModifier(openChar: '"', closeString: '"');
+
+  static const parentheses =
+      InsertionCodeModifier(openChar: '(', closeString: ')');
+
+  static const singleQuotes =
+      InsertionCodeModifier(openChar: '\'', closeString: '\'');
+
+  @override
+  TextEditingValue? updateString(
+    String text,
+    TextSelection sel,
+    EditorParams params,
+  ) {
+    final replaced = replace(text, sel.start, sel.end, '$openChar$closeString');
+
+    return replaced.copyWith(
+      selection: TextSelection(
+        baseOffset: replaced.selection.baseOffset - closeString.length,
+        extentOffset: replaced.selection.extentOffset - closeString.length,
+      ),
+    );
+  }
+}

lib/src/folding/parsers/parser_factory.dart

@@ -1,9 +1,11 @@
 import 'package:highlight/highlight_core.dart';
 import 'package:highlight/languages/java.dart';
 import 'package:highlight/languages/python.dart';
+import 'package:highlight/languages/yaml.dart';
 
 import 'abstract.dart';
 import 'highlight.dart';
+import 'indent.dart';
 import 'java.dart';
 import 'python.dart';
 
@@ -15,6 +17,11 @@ class FoldableBlockParserFactory {
     if (mode == java) {
       return JavaFoldableBlockParser();
     }
+
+    if (mode == yaml) {
+      return IndentFoldableBlockParser();
+    }
+
     return HighlightFoldableBlockParser();
   }
 }

lib/src/util/string_util.dart

@@ -0,0 +1,14 @@
+class StringUtil {
+  static bool isDigit(String char) {
+    if (char.isEmpty || char.length > 1) return false;
+    final codeUnit = char.codeUnitAt(0);
+    return codeUnit >= 48 && codeUnit <= 57; // Unicode range for '0' to '9'
+  }
+
+  static bool isLetterEng(String char) {
+    if (char.isEmpty || char.length > 1) return false;
+    final codeUnit = char.codeUnitAt(0);
+    return (codeUnit >= 65 && codeUnit <= 90) || // A-Z
+        (codeUnit >= 97 && codeUnit <= 122); // a-z
+  }
+}

lib/src/wip/autocomplete/popup.dart

@@ -45,6 +45,7 @@ class Popup extends StatefulWidget {
 
 class PopupState extends State<Popup> {
   final pageStorageBucket = PageStorageBucket();
+
   @override
   void initState() {
     widget.controller.addListener(rebuild);
@@ -68,6 +69,13 @@ class PopupState extends State<Popup> {
             (widget.editorOffset?.dx ?? 0) -
             100;
 
+    // Fixes assertion error when ISC isn't attached but _attach method
+    // of ISC instance are being called
+    ItemScrollController? isc;
+    if (widget.controller.itemScrollController.isAttached) {
+      isc = widget.controller.itemScrollController;
+    }
+
     return PageStorage(
       bucket: pageStorageBucket,
       child: Positioned(
@@ -97,7 +105,7 @@ class PopupState extends State<Popup> {
             child: ScrollablePositionedList.builder(
               shrinkWrap: true,
               physics: const ClampingScrollPhysics(),
-              itemScrollController: widget.controller.itemScrollController,
+              itemScrollController: isc,
               itemPositionsListener: widget.controller.itemPositionsListener,
               itemCount: widget.controller.suggestions.length,
               itemBuilder: (context, index) {

lib/src/wip/autocomplete/popup_controller.dart

@@ -24,7 +24,7 @@ class PopupController extends ChangeNotifier {
   int get selectedIndex => _selectedIndex;
 
   void show(List<String> suggestions) {
-    if (enabled == false) {
+    if (!enabled) {
       return;
     }