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<Match> parseOn(Context context) {
final result = pattern.matchAsPrefix(context.buffer, context.position);
if (result == null) return context.failure(message);
return context.success(result, result.end);
}