parseOn method
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 beforeContext = before.parseOn(context);
if (beforeContext is Failure) return beforeContext;
final resultContext = delegate.parseOn(beforeContext);
if (resultContext is Failure) return resultContext;
final afterContext = after.parseOn(resultContext);
if (afterContext is Failure) return afterContext;
return afterContext.success(resultContext.value);
}