tryMatch method

bool tryMatch(InlineParser parser)

Attempts to close this tag by matching the current text against its end pattern.

Implementation

bool tryMatch(InlineParser parser) {
  final endMatch = syntax!.endPattern.matchAsPrefix(parser.source, parser.pos);
  if (endMatch == null) {
    return false;
  }

  if (!syntax!.requiresDelimiterRun) {
    // Close the tag.
    close(parser, endMatch);
    return true;
  }

  // TODO: Move this logic into TagSyntax.
  final runLength = endMatch.group(0)!.length;
  final openingRunLength = endPos - startPos;
  final closingMatchStart = parser.pos;
  final closingMatchEnd = parser.pos + runLength - 1;
  final closingDelimiterRun = _DelimiterRun.tryParse(parser, closingMatchStart, closingMatchEnd);
  if (closingDelimiterRun != null && closingDelimiterRun.canClose) {
    // Emphasis rules #9 and #10:
    final oneRunOpensAndCloses = (openingDelimiterRun!.canOpen && openingDelimiterRun!.canClose) ||
        (closingDelimiterRun.canOpen && closingDelimiterRun.canClose);
    if (oneRunOpensAndCloses && (openingRunLength + closingDelimiterRun.length!) % 3 == 0) {
      return false;
    }
    // Close the tag.
    close(parser, endMatch);
    return true;
  } else {
    return false;
  }
}