static DelimiterRun? tryParse()

in lib/src/inline_parser.dart [809:869]
56 lines of code
13 McCabe index (conditional complexity)

  static DelimiterRun? tryParse(InlineParser parser, int runStart, int runEnd,
      {required TagSyntax syntax,
      required Text node,
      bool allowIntraWord = false}) {
    bool leftFlanking,
        rightFlanking,
        precededByPunctuation,
        followedByPunctuation;
    String preceding, following;
    if (runStart == 0) {
      rightFlanking = false;
      preceding = '\n';
    } else {
      preceding = parser.source!.substring(runStart - 1, runStart);
    }
    precededByPunctuation = punctuation.hasMatch(preceding);

    if (runEnd == parser.source!.length) {
      leftFlanking = false;
      following = '\n';
    } else {
      following = parser.source!.substring(runEnd, runEnd + 1);
    }
    followedByPunctuation = punctuation.hasMatch(following);

    // http://spec.commonmark.org/0.28/#left-flanking-delimiter-run
    if (whitespace.contains(following)) {
      leftFlanking = false;
    } else {
      leftFlanking = !followedByPunctuation ||
          whitespace.contains(preceding) ||
          precededByPunctuation ||
          allowIntraWord;
    }

    // http://spec.commonmark.org/0.28/#right-flanking-delimiter-run
    if (whitespace.contains(preceding)) {
      rightFlanking = false;
    } else {
      rightFlanking = !precededByPunctuation ||
          whitespace.contains(following) ||
          followedByPunctuation ||
          allowIntraWord;
    }

    if (!leftFlanking && !rightFlanking) {
      // Could not parse a delimiter run.
      return null;
    }

    return DelimiterRun._(
      node: node,
      char: parser.charAt(runStart),
      syntax: syntax,
      isLeftFlanking: leftFlanking,
      isRightFlanking: rightFlanking,
      isPrecededByPunctuation: precededByPunctuation,
      isFollowedByPunctuation: followedByPunctuation,
      allowIntraWord: allowIntraWord,
    );
  }