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Disable some commands from Xbase library [message #1422800]

Sat, 13 September 2014 11:47

Daniele P.

Messages: 18
Registered: August 2014

Junior Member

Hi,

I would like to know if is there the possibility to exclude some inherited command from xbase?
For example i would like to gain the possibility to user to use only System.out.println instead of println (from InputOutput library). Or for example to avoid use of var and val.
I'm thinking to write some validation rule for displaying an alert. I don't like this way because with the Eclipse's autocompletion i have always this possibility. Others ways?

Moreover, when i translate my method main (from my grammar) into the java main with "inferr", i have this output:

public static void main(final String... args) {
}

I would like some like this:

public static void main(String[] args) {
}

Is it possible? I'm using this code:

members += elem.toMethod(elem.name, elem.type ?: inferredType) [
								parameters += elem.toParameter("args",  model.newTypeRef(typeof(String)).addArrayTypeDimension())
								static = true
        						varArgs = true													
								body = elem.body
							]

Thanks in advance

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Re: Disable some commands from Xbase library [message #1423543 is a reply to message #1422800]

Sun, 14 September 2014 16:26

Sebastian Zarnekow

Messages: 3118
Registered: July 2009

Senior Member

Hi Daniele,

please find the answers inline.

Regards,
Sebastian
--
Looking for professional support for Xtext, Xtend or Eclipse Modeling?
Go visit: http://xtext.itemis.com

Am 13.09.14 13:47, schrieb Daniele P.:
> Hi,
>
> I would like to know if is there the possibility to exclude some
> inherited command from xbase? For example i would like to gain the
> possibility to user to use only System.out.println instead of println
> (from InputOutput library). Or for example to avoid use of var and val.
> I'm thinking to write some validation rule for displaying an alert. I
> don't like this way because with the Eclipse's autocompletion i have
> always this possibility. Others ways?

Override ImplicitlyImportedFeatures and return only a subset from
getStaticImportClasses.

>
> Moreover, when i translate my method main (from my grammar) into the
> java main with "inferr", i have this output:
>
>
> public static void main(final String... args) {
> }
>
>
> I would like some like this:
>
>
> public static void main(String[] args) {
> }
>
>
> Is it possible? I'm using this code:
> members += elem.toMethod(elem.name, elem.type ?: inferredType) [
> parameters += elem.toParameter("args",
> model.newTypeRef(typeof(String)).addArrayTypeDimension())
> static = true
> varArgs = true
> body = elem.body
> ]

you can use varArgs = false instead of true and it'll yield a method
without vararg support.

> Thanks in advance

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Re: Disable some commands from Xbase library [message #1425753 is a reply to message #1423543]

Wed, 17 September 2014 19:57

Daniele P.

Messages: 18
Registered: August 2014

Junior Member

Thanks for your answer.

"Override ImplicitlyImportedFeatures and return only a subset from getStaticImportClasses"

Can you make me an example? I didn't find anyone tutorial about it and i don't know how to start or proceed.

Moreover i have a problem with variable declaration. In JVM Inferr, when i translate my grammar in a java code, how can i create an array?

I would like convert my variables declaration (from my grammar) in a correct java array.
At the moment i use this grammar:

Variabili:
type = JvmTypeReference name=ID ((array ?='[' (lenght=INT)? ']')?)|(('=' init=XExpression)?) ';'
;

If i use init i don't have problem, but if i use array i don't know how to convert into the java code
Thanks in advance

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Re: Disable some commands from Xbase library [message #1426064 is a reply to message #1425753]

Thu, 18 September 2014 07:31

Sebastian Zarnekow

Messages: 3118
Registered: July 2009

Senior Member

Hi Daniele,

please refer to the documentation on dependency injection in Xtext for
details on how to override the ImplicitlyImportedFeatures.
Basically you'll have to create a subtype of ImplicitlyImportedFeatures
and override the methods as you like. This subtype has to be registered
in the runtime module of your language.

I guess I don't understand the second question 'How to create an array'.
Did you try to set the body / initializer of your infered field / method
to something like this:

jvmField.initializer = '''new «v.type»[«v.length»];'''

Regards,
Sebastian
--
Looking for professional support for Xtext, Xtend or Eclipse Modeling?
Go visit: http://xtext.itemis.com

Am 17.09.14 21:57, schrieb Daniele P.:
> Thanks for your answer.
>
> "Override ImplicitlyImportedFeatures and return only a subset from
> getStaticImportClasses"
>
> Can you make me an example? I didn't find anyone tutorial about it and i
> don't know how to start or proceed.
>
>
> Moreover i have a problem with variable declaration. In JVM Inferr, when
> i translate my grammar in a java code, how can i create an array?
>
> I would like convert my variables declaration (from my grammar) in a
> correct java array.
> At the moment i use this grammar:
>
> Variabili:
> type = JvmTypeReference name=ID ((array ?='[' (lenght=INT)?
> ']')?)|(('=' init=XExpression)?) ';'
> ;
>
> If i use init i don't have problem, but if i use array i don't know how
> to convert into the java code
> Thanks in advance

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Re: Disable some commands from Xbase library [message #1426377 is a reply to message #1426064]

Thu, 18 September 2014 17:00

Daniele P.

Messages: 18
Registered: August 2014

Junior Member

Thank you very much.
Now the array declaration its work.
I extended "ImplicitlyImportedFeatures" with this code but it doesn't work:

@Override
public List<JvmType> getExtensionClasses(Resource context) 
{		
	List<Class<?>> classes = getExtensionClasses();
	for(int i = 0; i < classes.size(); i++)
	{
		if(classes.get(i).toString().compareTo("var") == 0)
		{
			classes.remove(i);
		}
	}
	return getTypes(classes, context);
}

How can debug this code? Breakpoint seems not to work.

Moreover, i would like to implement a sort of get(int i) for my array. How can i do that?

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Re: Disable some commands from Xbase library [message #1426389 is a reply to message #1426377]

Thu, 18 September 2014 17:29

Christian Dietrich

Messages: 14716
Registered: July 2009

Senior Member

Hi,

the var keyword cannot be disabled that way

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

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Re: Disable some commands from Xbase library [message #1428175 is a reply to message #1426389]

Sun, 21 September 2014 11:42

Daniele P.

Messages: 18
Registered: August 2014

Junior Member

Hi, i would like to insert in "XBlockExpression" the possibility to define variable in a java-like form.
I have defined the variables declaration, in my grammar in this way:

Variable:
	type = JvmTypeReference name=ID  ((array ?='[' (lenght=INT)? ']')?)|(('=' init=XExpression)?) ';'	
;

After this, i have defined the JvmInferr for transcoding into a java class and the validation plan to avoid error.

I would like to remove the var and val declaration, but i don't know how. Moreover i would like to inject my variable declaration in a XBlockExpression.
Can you help me to understand how resolve this problems?

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