がってんなら - what kind of contraction am I dealing with in this sentence?


I'm trying to understand how to parse the がってんなら in this sentence (it's from
Tales of Vesperia, in case anyone's curious):

> 帝国がってんなら、  
>  この旅の間にも  
>  何度か見てきたろ？

This is how it's translated in the English version of the game:

> Haven't you already seen what  
>  the empire's capable of several  
>  times on this trip already?

The second part of the sentence is easy enough, but I just can't wrap my head
around the first part. Is it short for 帝国があっているなら or something? And what would
that translate to literally? Is there some bit that's omitted that I should be
able to infer from context?




> 帝国がってんなら、

It looks like a contracted pronunciation of 帝国が **と言うの** なら。

～というのなら → ～ってのなら → ～ってんなら  
(The particle って can be the colloquial version of という.)

I think the sentence literally means:

> 『帝国が』と言うのなら、  
>  If you mean "The empire (did...),"  
>  この旅の間にも  
>  on this trip, too  
>  何度か見てきたろ？  
>  you've already seen (what it's capable of) several times, haven't you?




> 帝国がってんなら、

It looks like a contracted pronunciation of 帝国が **と言うの** なら。

～というのなら → ～ってのなら → ～ってんなら  
(The particle って can be the colloquial version of という.)

I think the sentence literally means:

> 『帝国が』と言うのなら、  
>  If you mean "The empire (did...),"  
>  この旅の間にも  
>  on this trip, too  
>  何度か見てきたろ？  
>  you've already seen (what it's capable of) several times, haven't you?

