parseOn method

@override Result<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<R> parseOn(Context context) {
  final buffer = context.buffer;
  final before = _trim(left, buffer, context.position);
  if (before != context.position) {
    context = Context(buffer, before);
  }
  final result = delegate.parseOn(context);
  if (result is Failure) return result;
  final after = _trim(right, buffer, result.position);
  return after == result.position
      ? result
      : result.success(result.value, after);
}