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Content Assist [message #1024305]

Tue, 26 March 2013 04:40

Neeraj Bhusare

Messages: 177
Registered: July 2009
Location: Canada

Senior Member

Hi,
I am finding it hard to get the content assist working for the following dsl. To be specific, while defining the type for an attribute (Attribute rule), content assist shows the defined Entities and not the Datatypes (string, decimal,...). For some reason, the methods complete_XXDataType() in the Proposal provider are not getting invoked. If I change the Attribute rule to [0], the complete methods get invoked. Not sure what is going wrong.

I checked the forum but I couldn't find anything related to my problem. I also had a look at couple of dsl's [1], but it didn't help. Any thoughts/pointers ?

NSDeclaration:
// namespace and import
entity=Entity
;

Entity:
'entity' name=ID '{'
attributes+=Attribute*
'}'
;

Attribute:
name=ID ':' type=Type
;

Type:
datatype=DataType | entityRef=EntityReference
;

EntityReference:
entity=[Entity]
;

DataType:
StringDataType | DecimalDataType | BooleanDataType | NumberDataType
;

StringDataType:
'string'
;

DecimalDataType:
'decimal'
;

BooleanDataType:
'boolean'
;

NumberDataType:
'number'
;

------------------------------------------
[0]
Attribute:
name=ID ':' (datatype=DataType | entityRef=EntityReference)
;

-------------------------------------------
[1]
http://www.eclipse.org/Xtext/community.html

Thanks in advance.

Twitter : @NeerajBhusare
Blog : https://nbhusare.github.io/
Best regards, Neeraj

[Updated on: Tue, 26 March 2013 04:41]

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Re: Content Assist [message #1027294 is a reply to message #1024305]

Tue, 26 March 2013 20:34

Ian McDevitt

Messages: 70
Registered: December 2012
Location: Belfast

Member

For some reason, the methods complete_XXDataType() in the Proposal provider are not getting invoked.

It may be that as your XXDataTypes are Parser rules they are consumed before the later stages of grammar rules, content assist and proposal are run.
As literals I would expect they would get proposed automatically.

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Re: Content Assist [message #1027820 is a reply to message #1027294]

Wed, 27 March 2013 12:59

Ian McDevitt

Messages: 70
Registered: December 2012
Location: Belfast

Member

Actually I meant Data Type Rules (no assignments or actions) rather than Parser rules.

Also you may think you are in the middle of entering a DataType but the parser/proposer may not know if it's that or an EntityReference so may only be able to call complete_Attribute with a reference of 'type'.

I don't know why [0] makes a difference, I'm just suggesting some pointers above, but I have found that simpler grammars work better than many levels of abstraction.

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