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

Thu, 07 September 2017 04:02

Kaushal Patel

Messages: 72
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: 14067
Registered: July 2009

Senior Member

Use scopeprovider. Content assist itself uses scope provider

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/it-services/methods-and-tools/xtext
Twitter : @chrdietrich
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: 14067
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

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

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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: 72
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: 14067
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

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

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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: 72
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: 14067
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

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 #1772247 is a reply to message #1772242]

Thu, 07 September 2017 06:13

Kaushal Patel

Messages: 72
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: 14067
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?
Go to: https://www.itemis.com/en/it-services/methods-and-tools/xtext
Twitter : @chrdietrich
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: 14067
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?
Go to: https://www.itemis.com/en/it-services/methods-and-tools/xtext
Twitter : @chrdietrich
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: 72
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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