packages/wyatt_ui_components/lib/src/domain/entities/entities.dart

@@ -23,4 +23,5 @@ export './error_widget_component.dart';
 export './loader_component.dart';
 export './loader_style.dart';
 export './loading_widget_component.dart';
+export './rich_text_builder/rich_text_builder.dart';
 export './theme_style.dart';

packages/wyatt_ui_components/lib/src/domain/entities/rich_text_builder/parser.dart

@@ -0,0 +1,120 @@
+// Copyright (C) 2023 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:flutter/widgets.dart';
+
+class RichTextStyleParameter {
+  const RichTextStyleParameter(
+    this.defaultStyle,
+    this.definedStyle,
+    this.styleName,
+  );
+
+  final TextStyle defaultStyle;
+  final Map<String, TextStyle> definedStyle;
+  final String? styleName;
+
+  TextStyle get style {
+    if (definedStyle.containsKey(styleName)) {
+      return definedStyle[styleName]!;
+    }
+    return defaultStyle;
+  }
+
+  RichTextStyleParameter copyWith({
+    TextStyle? defaultStyle,
+    Map<String, TextStyle>? definedStyle,
+    String? styleName,
+  }) =>
+      RichTextStyleParameter(
+        defaultStyle ?? this.defaultStyle,
+        definedStyle ?? this.definedStyle,
+        styleName ?? this.styleName,
+      );
+}
+
+class RichTextNode {
+  RichTextNode(this.nodes);
+
+  final List<RichTextNode> nodes;
+
+  static RichTextNode from(
+    String content,
+    RegExp regex,
+    RichTextStyleParameter styleParameter,
+  ) {
+    final matches = regex.allMatches(content);
+    if (matches.isNotEmpty) {
+      // match found -> construct node with leaf/nodes
+      final List<RichTextNode> nodes = [];
+      for (var i = 0; i < matches.length; i++) {
+        final previousMatch = i > 0 ? matches.elementAt(i - 1) : null;
+        final currentMatch = matches.elementAt(i);
+        // non match before
+        final nonMatchBefore = (previousMatch != null)
+            ? content.substring(previousMatch.end, currentMatch.start)
+            : content.substring(0, currentMatch.start);
+        nodes
+          ..add(RichTextNode.from(nonMatchBefore, regex, styleParameter))
+          // match
+          ..add(
+            RichTextNode.from(
+              currentMatch.group(2)!,
+              regex,
+              styleParameter.copyWith(styleName: currentMatch.group(1)),
+            ),
+          );
+      }
+      // non match after
+      final nonMatchAfter = content.substring(matches.last.end);
+      nodes.add(RichTextNode.from(nonMatchAfter, regex, styleParameter));
+      return RichTextNode(nodes);
+    } else {
+      // match not found -> construct leaf
+      return RichTextLeaf(styleParameter.style, content);
+    }
+  }
+
+  InlineSpan toInlineSpan(RichTextParser parser) {
+    final children = <InlineSpan>[];
+    for (final node in nodes) {
+      children.add(node.toInlineSpan(parser));
+    }
+    return TextSpan(children: children);
+  }
+}
+
+class RichTextLeaf extends RichTextNode {
+  RichTextLeaf(this.style, this.content) : super([]);
+
+  final TextStyle style;
+  final String content;
+
+  @override
+  InlineSpan toInlineSpan(RichTextParser parser) =>
+      parser.nodeBuilder.call(content, style);
+}
+
+class RichTextParser {
+  const RichTextParser({required this.nodeBuilder});
+  factory RichTextParser.defaultBuilder() => RichTextParser(
+        nodeBuilder: (content, style) => TextSpan(
+          text: content,
+          style: style,
+        ),
+      );
+  final InlineSpan Function(String content, TextStyle style) nodeBuilder;
+}

packages/wyatt_ui_components/lib/src/domain/entities/rich_text_builder/rich_text_builder.dart

@@ -0,0 +1,19 @@
+// Copyright (C) 2023 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+export 'parser.dart';
+export 'rich_text_builder_component.dart';
+export 'rich_text_builder_style.dart';

packages/wyatt_ui_components/lib/src/domain/entities/rich_text_builder/rich_text_builder_component.dart

@@ -0,0 +1,56 @@
+// Copyright (C) 2023 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:flutter/widgets.dart';
+import 'package:wyatt_component_copy_with_extension/component_copy_with_extension.dart';
+import 'package:wyatt_ui_components/wyatt_wyatt_ui_components.dart';
+
+part 'rich_text_builder_component.g.dart';
+
+@ComponentProxyExtension()
+abstract class RichTextBuilderComponent extends Component
+    with CopyWithMixin<$RichTextBuilderComponentCWProxy> {
+  const RichTextBuilderComponent({
+    this.text,
+    this.parser,
+    this.defaultStyle,
+    this.styles,
+    super.themeResolver,
+    super.key,
+  });
+
+  /// Full text
+  final String? text;
+
+  /// How to build InlineSpans
+  final RichTextParser? parser;
+
+  /// Default TextStyle used in this rich text component.
+  final TextStyle? defaultStyle;
+
+  /// Used styles in this rich text component.
+  /// 
+  /// e.g.
+  /// ```dart
+  /// styles = {'red': TextStyle(color: Colors.red)};
+  /// ```
+  /// will transform:
+  /// ```text
+  /// This text <red>is red</red.
+  /// ```
+  /// in "This text `is red`."
+  final Map<String, TextStyle>? styles;
+}

packages/wyatt_ui_components/lib/src/domain/entities/rich_text_builder/rich_text_builder_component.g.dart

@@ -0,0 +1,25 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'rich_text_builder_component.dart';
+
+// **************************************************************************
+// ComponentProxyGenerator
+// **************************************************************************
+
+abstract class $RichTextBuilderComponentCWProxy {
+  RichTextBuilderComponent text(String? text);
+  RichTextBuilderComponent parser(RichTextParser? parser);
+  RichTextBuilderComponent defaultStyle(TextStyle? defaultStyle);
+  RichTextBuilderComponent styles(Map<String, TextStyle>? styles);
+  RichTextBuilderComponent themeResolver(
+      ThemeResolver<dynamic, dynamic, dynamic>? themeResolver);
+  RichTextBuilderComponent key(Key? key);
+  RichTextBuilderComponent call({
+    String? text,
+    RichTextParser? parser,
+    TextStyle? defaultStyle,
+    Map<String, TextStyle>? styles,
+    ThemeResolver<dynamic, dynamic, dynamic>? themeResolver,
+    Key? key,
+  });
+}

packages/wyatt_ui_components/lib/src/domain/entities/rich_text_builder/rich_text_builder_style.dart

@@ -0,0 +1,83 @@
+// Copyright (C) 2023 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:flutter/widgets.dart';
+import 'package:wyatt_ui_components/wyatt_wyatt_ui_components.dart';
+
+class RichTextBuilderStyle extends ThemeStyle<RichTextBuilderStyle> {
+  const RichTextBuilderStyle({
+    this.defaultStyle,
+    this.styles,
+  });
+
+  /// Merges non-null `b` attributes in `a`
+  static RichTextBuilderStyle? merge(
+    RichTextBuilderStyle? a,
+    RichTextBuilderStyle? b,
+  ) {
+    if (b == null) {
+      return a?.copyWith();
+    }
+    if (a == null) {
+      return b.copyWith();
+    }
+
+    return a.copyWith(
+      defaultStyle: b.defaultStyle,
+      styles: b.styles,
+    );
+  }
+
+  /// Used for interpolation.
+  static RichTextBuilderStyle? lerp(
+    RichTextBuilderStyle? a,
+    RichTextBuilderStyle? b,
+    double t,
+  ) {
+    if (a == null || b == null) {
+      return null;
+    }
+    // b.copyWith to return b attributes even if they are not lerped
+    return b.copyWith(
+      defaultStyle: TextStyle.lerp(a.defaultStyle, b.defaultStyle, t),
+      styles: b.styles, // TODO(wyatt): compute lerp value of each styles
+    );
+  }
+
+  /// Default TextStyle used in this rich text component.
+  final TextStyle? defaultStyle;
+
+  /// Used styles in this rich text component.
+  final Map<String, TextStyle>? styles;
+
+  @override
+  RichTextBuilderStyle mergeWith(RichTextBuilderStyle? other) =>
+      RichTextBuilderStyle.merge(this, other)!;
+
+  @override
+  RichTextBuilderStyle? lerpWith(RichTextBuilderStyle? other, double t) =>
+      RichTextBuilderStyle.lerp(this, other, t);
+
+  @override
+  RichTextBuilderStyle copyWith({
+    TextStyle? defaultStyle,
+    Map<String, TextStyle>? styles,
+  }) =>
+      RichTextBuilderStyle(
+        defaultStyle: defaultStyle ?? this.defaultStyle,
+        styles: styles ?? this.styles,
+      );
+}