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Use of proposalprovider for content-assist [message #1772235]

Thu, 07 September 2017 04:02

Kaushal Patel

Messages: 71
Registered: June 2017

Member

Hello Experts,

I am trying to implement content-assist in pathexpression using cross-reference within double quotes.

I read these articles to solve reference problems and pathexpression implementation.

https://christiandietrich.wordpress.com/2015/03/19/xtext-and-strings-as-cross-references/

https://christiandietrich.wordpress.com/2013/05/18/xtext-and-dot-expressions/

I am writing grammar for yang language. While writing my yang file in new eclipse application I am getting error in schemanodeidentifier.

This is what I am trying to implement.

submodule "NAME"{
	container "N"{
		leaf-list "A"{		
			leaf "M"{
				list "E";
		}
		}
	}
	augment "/N/A/M/E";
}

I am getting this error:
Couldn't resolve reference to SchemaNode '"/N/A/M/E"'.

I am not getting error when I write like this:

augment /"N"/"A"/"M"/"E";

This is my grammar.


YangFile:
	Module|
	SubModule
;

Module:
	"module" name=STRINGARG
	"{"
	(statements+=Statement)*
	"}"
;


SubModule:
	"submodule" name =STRINGARG
	"{"
		(statements+=Statement)*
	"}"
;
	
Statement:
	  SchemaNode | OtherStatement 
;

SchemaNode :
	DataSchemaNode ;

OtherStatement:
	Augment
;

DataSchemaNode :
	Container |
	List |
	Leaf |
	LeafList
;

Container:
	'container' name=STRINGARG (';'|
		'{'
			(substatements+=DataSchemaNode)
		'}'
	)
;

Leaf :
	'leaf' name=STRINGARG (';'|
		'{'
			(substatements+=DataSchemaNode)
		'}'
	)
;

LeafList:
	'leaf-list' name=STRINGARG (';'|
		'{'
			(substatements+=DataSchemaNode)
		'}'
	)
;

List:
	'list' name=STRINGARG (';'|
		'{'
			(substatements+=DataSchemaNode)
		'}'
	)
;

Augment:
	'augment' path=SchemaNodeIdentifier ';'
;

SchemaNodeIdentifier returns SchemaNodeIdentifier :
	 RootSchemaNodeIdentifier ({SchemaNodeIdentifier.target=current}"/"?(schemanode=[SchemaNode|QNAME]))*
;

RootSchemaNodeIdentifier returns SchemaNodeIdentifier:
	{RootSchemaNodeIdentifier}isAbsolute?="/"?(schemanode=[SchemaNode|QNAME])
;


STRINGARG:
	ID|"default"|INT | STRING ;
	
QNAME:
	(STRINGARG ':')? STRINGARG
;

I haven't use proposal provider or scope provider.
I am confused that what should I use to achieve my output.

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Re: Use of proposalprovider for content-assist [message #1772236 is a reply to message #1772235]

Thu, 07 September 2017 04:22

Christian Dietrich

Messages: 12041
Registered: July 2009

Senior Member

Use scopeprovider. Content assist itself uses scope provider

Need professional support for Xtext, Xpand, EMF?
Go to: https://xtext.itemis.com
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Blog : https://www.dietrich-it.de

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Re: Use of proposalprovider for content-assist [message #1772237 is a reply to message #1772236]

Thu, 07 September 2017 04:23

Christian Dietrich

Messages: 12041
Registered: July 2009

Senior Member

And

Could not resolve reference is a scoping error
So you need to fix this anyway

And since the whole thing is the reference you don't have any path

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Re: Use of proposalprovider for content-assist [message #1772239 is a reply to message #1772237]

Thu, 07 September 2017 04:52

Kaushal Patel

Messages: 71
Registered: June 2017

Member

Thanks Chrisitian,

But I have one more confusion,
Is there any difference between SchemaNodeIdentifier or PathExpression?

As per YANG,
AugmentStatement only uses SchemaNodeIdentifier.

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Re: Use of proposalprovider for content-assist [message #1772242 is a reply to message #1772239]

Thu, 07 September 2017 05:36

Christian Dietrich

Messages: 12041
Registered: July 2009

Senior Member

in path expression xxx/yyy/zzz consistst of 3 parts = 3 references

same with augment /"N"/"A"/"M"/"E"

SchemaNode "/N/A/M/E" is one part = 1 reference

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Re: Use of proposalprovider for content-assist [message #1772243 is a reply to message #1772242]

Thu, 07 September 2017 05:38

Kaushal Patel

Messages: 71
Registered: June 2017

Member

Hi Christian,

I am using your dsl example as a refernce but it shows me error at

EntityRef : Scopes::scopeFor(head.entity.features)

The error is:
The method getEntity() from the type EntityRef refers to the
missing type Object

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Re: Use of proposalprovider for content-assist [message #1772244 is a reply to message #1772243]

Thu, 07 September 2017 05:42

Christian Dietrich

Messages: 12041
Registered: July 2009

Senior Member

this looks like java is not correctly setup in that project.
have a look at java build path in projects properties

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Re: Use of proposalprovider for content-assist [message #1772247 is a reply to message #1772242]

Thu, 07 September 2017 06:13

Kaushal Patel

Messages: 71
Registered: June 2017

Member

Hi Christian,

Your example works perfectly.
Thanks.

Can I use content-assist within double quotes.

I am using schemanodeidentifier.
Is it possible that i can import single node using content assist within double-quotes.

for example,

augment "N"

then again control+Space in double quotes for another node,

augment "N/A"

same thing again,

augment "N/A/M"

same again,

augment "N/A/M/E"

Like this.

Appreciate your help.

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Re: Use of proposalprovider for content-assist [message #1772251 is a reply to message #1772247]

Thu, 07 September 2017 06:52

Christian Dietrich

Messages: 12041
Registered: July 2009

Senior Member

sorry you ghave to digg into content assis ant prefixes for that yourself

Need professional support for Xtext, Xpand, EMF?
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Blog : https://www.dietrich-it.de

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Re: Use of proposalprovider for content-assist [message #1772253 is a reply to message #1772251]

Thu, 07 September 2017 07:05

Christian Dietrich

Messages: 12041
Registered: July 2009

Senior Member

maybe you can use a iderivedstatecomputer to turn

"a/b/c/d" into actually the same tree structure as "a"/"b"/"c"/"d" would be. use SyntethiclinkingSupport the feed the scoping with the correct proxys. but that wont help with content assist

Need professional support for Xtext, Xpand, EMF?
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Blog : https://www.dietrich-it.de

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Re: Use of proposalprovider for content-assist [message #1772254 is a reply to message #1772253]

Thu, 07 September 2017 07:12

Kaushal Patel

Messages: 71
Registered: June 2017

Member

Thanks Christian,

If I don't want to implement content-assist in SchemaNodeIdentifier then I can easily implement it using STRINGARG. I can make it STRING.

The main problem is content assist in within double quotes.

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