lvxiang

@thiagokronig checked that before, still not solving all the problems

@Maaartinus I don't think it's general enough as you have to redefine "AB" constantly. Except for StringBuilder, it might not be optimal in some cases, i.e, if all you want...

@ogregoire like your Rule and Ruler idea, almost same as what I have in my mind. You might consider taking the fluid-style by introducing something like a RuleBuilder.

@ogregoire agreed