parse function

ParseAstResult parse(String document)

Stage 1: parse a dewbead document into ASTs without touching NOW.

Splits on ;; (which titles/locations cannot contain) and parses each record independently. A document of exactly N yields empty lists.

Implementation

ParseAstResult parse(String document) {
  final s = document.trim();
  if (s.isEmpty) {
    return (asts: const [], errors: [RecordError(ParseError.empty, document)]);
  }
  if (s == 'N') return (asts: const [], errors: const []);

  final asts = <DewbeadAst>[];
  final errors = <RecordError>[];
  for (final raw in s.split(';;')) {
    final seg = raw.trim();
    try {
      asts.add(_parseRecord(seg));
    } on _ParseException catch (e) {
      errors.add(RecordError(e.reason, seg));
    }
  }
  return (asts: asts, errors: errors);
}