Create flutter_spannable_string.dart

flutter_spannable_string.dart

@@ -0,0 +1,125 @@
+import 'package:flutter/material.dart';
+
+class SpannableString {
+  static List<TextSpan> parse(String input) {
+    List<TextSpan> spans = [];
+    RegExp exp = RegExp(r'{ `([^`]+)` <([^/>]+) /> }');
+
+    int index = 0;
+
+    exp.allMatches(input).forEach((match) {
+      // Add the text before the matched pattern
+      spans.add(TextSpan(
+        text: input.substring(index, match.start),
+      ));
+
+      // Extract the content and properties from the match
+      String content = match.group(1)!;
+      String properties = match.group(2)!;
+
+      // Parse properties
+      Map<String, String> styleMap = parseProperties(properties);
+
+      // Add the styled text
+      spans.add(TextSpan(
+        text: content,
+        style: TextStyle(
+          color: styleMap['text-color'] != null
+              ? parseColor(styleMap['text-color'])
+              : null,
+          backgroundColor: styleMap['background-color'] != null
+              ? parseColor(styleMap['background-color'])
+              : null,
+          fontSize: styleMap['font-size'] != null
+              ? double.parse(styleMap['font-size']!)
+              : null,
+          decoration: parseTextDecoration(styleMap['text-decoration']),
+          fontStyle: parseFontStyle(styleMap['font-style'])
+        ),
+      ));
+
+      // Update the index to point to the end of the matched pattern
+      index = match.end;
+    });
+
+    // Add the remaining text after the last matched pattern
+    if (index < input.length) {
+      spans.add(TextSpan(
+        text: input.substring(index),
+      ));
+    }
+
+    return spans;
+  }
+
+  static Map<String, String> parseProperties(String properties) {
+    Map<String, String> styleMap = {};
+    List<String> propertyList = properties.split(',');
+    for (String property in propertyList) {
+      List<String> keyValue = property.trim().split(':');
+      if (keyValue.length == 2) {
+        styleMap[keyValue[0].trim()] = keyValue[1].trim();
+      }
+    }
+    return styleMap;
+  }
+
+  static Color parseColor(String? value) {
+    if (value == null) {
+      return Colors.black; // Default color
+    }
+
+    if (value.startsWith('#') && (value.length == 7 || value.length == 9)) {
+      // Hexadecimal color code
+      String hex = value.replaceAll('#', '');
+      int intValue = int.parse(hex, radix: 16);
+
+      if (value.length == 7) {
+        // If the color code doesn't include alpha, set alpha to 255 (fully opaque)
+        intValue |= 0xFF000000;
+      }
+
+      return Color(intValue);
+    }
+
+    return Colors.black; // Default color
+  }
+
+  static TextDecoration? parseTextDecoration(String? value) {
+    if (value == null) {
+      return null;
+    }
+
+    switch (value) {
+      case 'underline':
+        return TextDecoration.underline;
+      case 'strikethrough':
+        return TextDecoration.lineThrough;
+      default:
+        return null;
+    }
+  }
+
+  static FontStyle? parseFontStyle(String? value) {
+    if (value == 'italic') {
+      return FontStyle.italic;
+    }
+    return null;
+  }
+
+  static FontWeight? parseFontWeight(String? value) {
+    if (value == 'bold') {
+      return FontWeight.bold;
+    }
+    return null;
+  }
+
+  static double? parseBaseline(String? value) {
+    if (value != null && (value == 'subscript' || value == 'superscript')) {
+      // Adjust baseline for subscript and superscript
+      return value == 'subscript' ? -0.5 : 0.5;
+    }
+    return null;
+  }
+
+}