parse method
Implementation
@override
Node parse(BlockParser parser) {
final lines = <String>[];
late String tag;
while (!parser.isDone) {
final match = _seTextPattern.firstMatch(parser.current);
if (match == null) {
// More text.
lines.add(parser.current);
parser.advance();
continue;
} else {
// The underline.
tag = (match[1]![0] == '=') ? 'h1' : 'h2';
parser.advance();
break;
}
}
final contents = UnparsedContent(lines.join('\n'));
return Element(tag, [contents]);
}