parseOn method

@override Result<List<R>> parseOn(Context context)

Primitive method doing the actual parsing.

The method is overridden in concrete subclasses to implement the parser specific logic. The methods takes a parse context and returns the resulting context, which is either a Success or Failure context.

Implementation

@override
Result<List<R>> parseOn(Context context) {
  var current = context;
  final elements = <R>[];
  while (elements.length < min) {
    final result = delegate.parseOn(current);
    if (result.isFailure) {
      return result.failure(result.message);
    }
    elements.add(result.value);
    current = result;
  }
  for (;;) {
    final limiter = limit.parseOn(current);
    if (limiter.isSuccess) {
      return current.success(elements);
    } else {
      if (elements.length >= max) {
        return limiter.failure(limiter.message);
      }
      final result = delegate.parseOn(current);
      if (result.isFailure) {
        return limiter.failure(limiter.message);
      }
      elements.add(result.value);
      current = result;
    }
  }
}