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<Token<R>> parseOn(Context context) {
final result = delegate.parseOn(context);
if (result is Failure) return result;
final token = Token<R>(
result.value,
context.buffer,
context.position,
result.position,
);
return result.success(token);
}