parseOn method
Parses the given context.
Overridden in concrete subclasses to implement the parser-specific logic.
Takes a parse context and returns the resulting context, which is either
a Success or Failure context.
Implementation
@override
Result<Failure> parseOn(Context context) {
final result = delegate.parseOn(context);
if (result is Failure) {
return context.success(result);
} else {
return context.failure(message);
}
}