[QBS] What is the semantic difference between Rule and Transformer?

Tim Hutt tdhutt at gmail.com
Sat Nov 8 14:44:57 CET 2014

As far as I can see, a Transformer isn't aware of file tags - they act on
specific file names rather than file types, but yeah they seem to overlap a
lot and the use case for Transformers isn't totally clear from the
On 8 Nov 2014 13:39, "Smirnov Vladimir" <mapron at yandex.ru> wrote:

>  From docs:
> -A *multiplex rule* creates one *transformer* that takes all input
> artifacts with the matching input file tag and creates one or more
> artifacts.
> -A *simplex rule* creates one transformer per matching input file.
> -A *transformer* takes zero or more inputs and produces one or more
> output artifacts from them.
> So I can imagine that Rule wraps some Transformer's functionality. But why
> don't just use only Rules? What can i do with Transformer that Rule
> couldn't cover?
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