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[ATL} It is possible to have several rules with the same source type? [message #106833]

Thu, 18 June 2009 16:28

Eclipse User

Originally posted by: donwhy.gmail.com

Hi, It is possible to have several matched rules with the same source type?

e.g.:

It is possible to write this:

rule Attributes {
from:
s : Class!Attribute
to
t : Class!Attribute (t.name <- s.name)
}

rule Getter {
from:
s : Class!Attribute
to
t : Class!Method ( t.name <- 'get' + s.name)
}

rule Setter {
from:
s : Class!Attribute
to
t : Class!AttMethodribute (t.name <- 'get' + s.name)
}

Instead of:

rule Attributes {
from:
s : Class!Attribute
to
a: Class!Attribute (a.name <- s.name),

g: Class!Method ( g.name <- 'get' + s.name),

s: Class!AttMethodribute (s.name <- 'get' + s.name)
}

Thanks in advance

John

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Re: [ATL} It is possible to have several rules with the same source type? [message #106863 is a reply to message #106833]

Fri, 19 June 2009 07:53

William Piers

Messages: 301
Registered: July 2009

Senior Member

Hello,

John a écrit :
> Hi, It is possible to have several matched rules with the same source type?
>

Yes, but one element can't be matched by more than one matched rule: it
implies that if you have two rules with the same source element, each
must define constraints which are not realized by other rules.

e.g.

from:
s : Class!Attribute (s.isAbstract)

and

from:
s : Class!Attribute (not s.isAbstract)

However, you can use lazy rules instead of matched rules - this will
allow you to create rules with same source pattern and call them when
needed:
http://wiki.eclipse.org/ATL/User_Guide#Lazy_Rules

Best regards,

William

> e.g.:
>
> It is possible to write this:
>
> rule Attributes {
> from:
> s : Class!Attribute
> to
> t : Class!Attribute (t.name <- s.name)
> }
>
> rule Getter {
> from:
> s : Class!Attribute
> to
> t : Class!Method ( t.name <- 'get' + s.name)
> }
>
> rule Setter {
> from:
> s : Class!Attribute
> to
> t : Class!AttMethodribute (t.name <- 'get' + s.name)
> }
>
> Instead of:
>
> rule Attributes {
> from:
> s : Class!Attribute
> to
> a: Class!Attribute (a.name <- s.name),
>
> g: Class!Method ( g.name <- 'get' + s.name),
>
> s: Class!AttMethodribute (s.name <- 'get' + s.name)
> }
>
> Thanks in advance
>
> John
>

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