customTextSpans method

Implementation

List<TextSpan> customTextSpans() {
  String text = this;

  // Insert line breaks after specific punctuation marks unless they are within square brackets
  text = text.replaceAllMapped(
      RegExp(r'(\.|\:)(?![^\[]*\])\s*'), (match) => '${match[0]}\n');

  final RegExp regExpQuotes = RegExp(r'\"(.*?)\"');
  final RegExp regExpBraces = RegExp(r'\{(.*?)\}');
  final RegExp regExpParentheses = RegExp(r'\((.*?)\)');
  final RegExp regExpSquareBrackets = RegExp(r'\[(.*?)\]');
  final RegExp regExpDash = RegExp(r'\-(.*?)\-');

  final Iterable<Match> matchesQuotes = regExpQuotes.allMatches(text);
  final Iterable<Match> matchesBraces = regExpBraces.allMatches(text);
  final Iterable<Match> matchesParentheses =
      regExpParentheses.allMatches(text);
  final Iterable<Match> matchesSquareBrackets =
      regExpSquareBrackets.allMatches(text);
  final Iterable<Match> matchesDash = regExpDash.allMatches(text);

  final List<Match> allMatches = [
    ...matchesQuotes,
    ...matchesBraces,
    ...matchesParentheses,
    ...matchesSquareBrackets,
    ...matchesDash
  ]..sort((a, b) => a.start.compareTo(b.start));

  int lastMatchEnd = 0;
  List<TextSpan> spans = [];

  for (final Match match in allMatches) {
    if (match.start >= lastMatchEnd && match.end <= text.length) {
      final String preText = text.substring(lastMatchEnd, match.start);
      final String matchedText = text.substring(match.start, match.end);
      final bool isBraceMatch = regExpBraces.hasMatch(matchedText);
      final bool isParenthesesMatch = regExpParentheses.hasMatch(matchedText);
      final bool isSquareBracketMatch =
          regExpSquareBrackets.hasMatch(matchedText);
      final bool isDashMatch = regExpDash.hasMatch(matchedText);

      if (preText.isNotEmpty) {
        spans.add(TextSpan(text: preText));
      }

      TextStyle matchedTextStyle;
      if (isBraceMatch) {
        matchedTextStyle = const TextStyle(
            color: Color(0xff008000),
            fontFamily: 'uthmanic2',
            package: "quran_library");
      } else if (isParenthesesMatch) {
        matchedTextStyle = const TextStyle(
            color: Color(0xff008000),
            fontFamily: 'uthmanic2',
            package: "quran_library");
      } else if (isSquareBracketMatch) {
        matchedTextStyle = const TextStyle(color: Color(0xff814714));
      } else if (isDashMatch) {
        matchedTextStyle = const TextStyle(color: Color(0xff814714));
      } else {
        matchedTextStyle = const TextStyle(
            color: Color(0xffa24308),
            fontFamily: 'naskh',
            package: "quran_library");
      }

      spans.add(TextSpan(
        text: matchedText,
        style: matchedTextStyle,
      ));

      lastMatchEnd = match.end;
    }
  }

  if (lastMatchEnd < text.length) {
    spans.add(TextSpan(text: text.substring(lastMatchEnd)));
  }

  return spans;
}