Node? close()

in lib/src/inline_parser.dart [976:1033]
35 lines of code
8 McCabe index (conditional complexity)

  Node? close(
      InlineParser parser, covariant SimpleDelimiter opener, Delimiter? closer,
      {required List<Node> Function() getChildren}) {
    var text = parser.source!.substring(opener.endPos, parser.pos);
    // The current character is the `]` that closed the link text. Examine the
    // next character, to determine what type of link we might have (a '('
    // means a possible inline link; otherwise a possible reference link).
    if (parser.pos + 1 >= parser.source!.length) {
      // The `]` is at the end of the document, but this may still be a valid
      // shortcut reference link.
      return _tryCreateReferenceLink(parser, text, getChildren: getChildren);
    }

    // Peek at the next character; don't advance, so as to avoid later stepping
    // backward.
    var char = parser.charAt(parser.pos + 1);

    if (char == $lparen) {
      // Maybe an inline link, like `[text](destination)`.
      parser.advanceBy(1);
      var leftParenIndex = parser.pos;
      var inlineLink = _parseInlineLink(parser);
      if (inlineLink != null) {
        return _tryCreateInlineLink(parser, inlineLink,
            getChildren: getChildren);
      }
      // At this point, we've matched `[...](`, but that `(` did not pan out to
      // be an inline link. We must now check if `[...]` is simply a shortcut
      // reference link.

      // Reset the parser position.
      parser.pos = leftParenIndex;
      parser.advanceBy(-1);
      return _tryCreateReferenceLink(parser, text, getChildren: getChildren);
    }

    if (char == $lbracket) {
      parser.advanceBy(1);
      // At this point, we've matched `[...][`. Maybe a *full* reference link,
      // like `[foo][bar]` or a *collapsed* reference link, like `[foo][]`.
      if (parser.pos + 1 < parser.source!.length &&
          parser.charAt(parser.pos + 1) == $rbracket) {
        // That opening `[` is not actually part of the link. Maybe a
        // *shortcut* reference link (followed by a `[`).
        parser.advanceBy(1);
        return _tryCreateReferenceLink(parser, text, getChildren: getChildren);
      }
      var label = _parseReferenceLinkLabel(parser);
      if (label != null) {
        return _tryCreateReferenceLink(parser, label, getChildren: getChildren);
      }
      return null;
    }

    // The link text (inside `[...]`) was not followed with a opening `(` nor
    // an opening `[`. Perhaps just a simple shortcut reference link (`[...]`).
    return _tryCreateReferenceLink(parser, text, getChildren: getChildren);
  }