Eclipse Community Forums: TMF (Xtext) » How to get returntype of xblockexpression

Help

Home

Home » Modeling » TMF (Xtext) » How to get returntype of xblockexpression(using scripting language)

Show: Today's Messages :: Show Polls :: Message Navigator

How to get returntype of xblockexpression [message #1089775]

Mon, 19 August 2013 08:20

Thomas Goossens

Messages: 32
Registered: August 2013

Member

(Using the example scripting language)

currently I use ITypeProvider to get a JvmTypeReference of the last expression's returntype in the xblockexpression

script.expressions.last

I have two questions:

1) I notice that the class is deprecated? What should I use instead?

2) What if I want it to be able "detect" my own classes as returntype (not only the java primitives and String). Do I have to register these type somewhere?

Thanks Smile

[Updated on: Mon, 19 August 2013 08:22]

Report message to a moderator

Re: How to get returntype of xblockexpression [message #1089778 is a reply to message #1089775]

Mon, 19 August 2013 08:23

Christian Dietrich

Messages: 14669
Registered: July 2009

Senior Member

Hi,

did you have a look at the domain model example? it shows how to deal with a implcit return type

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

Report message to a moderator

Re: How to get returntype of xblockexpression [message #1089813 is a reply to message #1089778]

Mon, 19 August 2013 09:25

Thomas Goossens

Messages: 32
Registered: August 2013

Member

Hi thanks for the quick response.

If I understand it correctly, in the example they rely on the fact that a Feature has a 'type' field. And pass that to the 'toMethod' method?

[Updated on: Mon, 19 August 2013 09:27]

Report message to a moderator

Re: How to get returntype of xblockexpression [message #1089857 is a reply to message #1089813]

Mon, 19 August 2013 10:43

Christian Dietrich

Messages: 14669
Registered: July 2009

Senior Member

Hi

isnt the return type optional? have a look at the inferrer

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

Report message to a moderator

Re: How to get returntype of xblockexpression [message #1100695 is a reply to message #1089775]

Tue, 03 September 2013 13:02

Lorenzo Bettini

Messages: 1812
Registered: July 2009
Location: Firenze, Italy

Senior Member

On 08/19/2013 10:20 AM, Thomas Goossens wrote:
> (Using the example scripting language)
>
> currently I use ITypeProvider to get the returntype of the last
> expression in the xblock
>
> script.expressions.last
>
>
> I have two questions:
>
> 1) I notice that the class is deprecated? What should I use instead?
>
> 2) What if I want it to be able "detect" my own classes as returntype
> (not only the java primitives and String). Do I have to register these
> type somewhere?
>
> Thanks :)

Hi

as far as I know, now you should inject a

IBatchTypeResolver typeResolver

and then do something like

typeResolver.resolveTypes(e).
getActualType(e)?.toTypeReference

to get the type reference.

In order for this mechanism to work, you must make sure that the
expression is passed to the TypeComputer otherwise types will not be
resolved.

This requires that the main xexpression block is logically contained in
inferred java method.

If you want to give custom types to some expressions you can implement
your own TypeComputer. An example can be found in the 7 languages examples.

hope this helps
Lorenzo

--
Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
HOME: http://www.lorenzobettini.it
XTEXT BOOK:
http://www.packtpub.com/implementing-domain-specific-languages-with-xtext-and-xtend/book

HOME: http://www.lorenzobettini.it
TDD Book: https://leanpub.com/tdd-buildautomation-ci
Xtext Book: https://www.packtpub.com/application-development/implementing-domain-specific-languages-xtext-and-xtend-second-edition

Report message to a moderator

Previous Topic:	ValueConverterException
Next Topic:	Simplest way to build Xtext (TMF) from source code

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Fri Apr 26 20:38:47 GMT 2024

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter