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Home » Modeling » TMF (Xtext) » Acces a single element in a list of events(I am trying to get access to a single element in a list)

Acces a single element in a list of events [message #1793780]

Wed, 15 August 2018 15:20

Eclipse User

These are my events:

event warte,Verschlussstand,ID_Test, Reinigen,Kaffee,Latte,Error,Fill

Now When I do this: «FOR s:machine.events» «s.name» «ENDFOR» I receive this [warte, Verschlussstand, ID_Test, Reinigen, Kaffee, Latte, Error, Fill] which is normal

Now I wish to have just the first event(warte) of the list. How do I proceed?

I thought of somthing like this --> machine.events->0 to have only "warte" but it doesnt work.

Thanks for helping

Re: Acces a single element in a list of events [message #1793781 is a reply to message #1793780]

Wed, 15 August 2018 15:22

Eclipse User

what do you mean by does not work?

«statemachine.events.head.name»

Re: Acces a single element in a list of events [message #1793782 is a reply to message #1793781]

Wed, 15 August 2018 15:28

Eclipse User

I just tried «statemachine.events.head.name» and it gave me this [warte, Verschlussstand, ID_Test, Reinigen, Kaffee, Latte, Error, Fill]

Re: Acces a single element in a list of events [message #1793783 is a reply to message #1793781]

Wed, 15 August 2018 15:33

Eclipse User

Any other suggestions?? Please!!!!
I really need to be able to access avery single element of that list. Thanks for your Help.

Re: Acces a single element in a list of events [message #1793784 is a reply to message #1793783]

Wed, 15 August 2018 15:35

Eclipse User

please give a complete example

Re: Acces a single element in a list of events [message #1793785 is a reply to message #1793784]

Wed, 15 August 2018 15:37

Eclipse User

are you sure events is not a list of lists? that would explain the [] in your output

Re: Acces a single element in a list of events [message #1793786 is a reply to message #1793785]

Wed, 15 August 2018 15:46

Eclipse User

Exactly I got abit irritated when I saw the braces"[ ]". Well I just uploaded the pictures of what im doing right now. I hope with thos Info you will get my problems. Thanks again.

Attachment: codegen.PNG
(Size: 14.19KB, Downloaded 87 times)
Attachment: test.PNG
(Size: 3.10KB, Downloaded 116 times)
Attachment: gramw.PNG
(Size: 8.13KB, Downloaded 109 times)

Re: Acces a single element in a list of events [message #1793787 is a reply to message #1793786]

Wed, 15 August 2018 15:53

Eclipse User

in your case a event is a list of names. so you want the first name in the first event?

=> you can use

«statemachine.events.head.name.head»

maybe you should rename "name" to "names" in the grammar to make clear it is a list.

Re: Acces a single element in a list of events [message #1793828 is a reply to message #1793787]

Thu, 16 August 2018 11:16

Eclipse User

Im very greatful for your help. I will make the changes and give you a feedback.

Re: Acces a single element in a list of events [message #1793831 is a reply to message #1793787]

Thu, 16 August 2018 12:33

Eclipse User

Thanks alot it works. Now I wish to get the second, third, fouth ... element. How do I proceed? Thanks for the hint.

Re: Acces a single element in a list of events [message #1793832 is a reply to message #1793831]

Thu, 16 August 2018 12:40

Eclipse User

«FOR n : statemachine.events.map[name].flatten».....

Re: Acces a single element in a list of events [message #1793835 is a reply to message #1793832]

Thu, 16 August 2018 13:03

Eclipse User

Im sorry my question was not clear. My aim is to grab the second element Only. I wish acces to every single element. For example

«machine.events.head.names.head» --> for the first element.
What about the second?
What about the third?

Sorry for asking so many questions. Im really new to xtext and I find it interesting. Thanks again for your help. Im greatful

Re: Acces a single element in a list of events [message #1793836 is a reply to message #1793835]

Thu, 16 August 2018 13:31

Eclipse User

list.get(i)

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