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Unordered Groups & Custom Checks [message #1004176]

Tue, 22 January 2013 13:34

Phil H
Messages: 66
Registered: November 2012

Member

Hi,

I've tried out the Custom Checks today and it works mostly, but I've got one problem with the boolean assignment operator (=?).
What I want to do is to define a grammar where some elements can be used only one time.
Because of that I've created the following Unordred Group:

Element:
	name=ConfigurationName &
	description?=Description? &
	tool=Tool &
	model=Model &
	interfaces?=Interfaces? &
	paramaters?=Parameters?
;

Then I implemented some custom checks which works so far with ConfigurationName or Model. But it doesn't work with parameters, where I was a little bit curious about it.
So I removed the boolean assignment operator (=?) from parameters and then it works. What's the problem here? Or is there a better way than to use an unordered group.

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Re: Unordered Groups & Custom Checks [message #1004178 is a reply to message #1004176]

Tue, 22 January 2013 13:35

Christian Dietrich
Messages: 4426
Registered: July 2009

Senior Member

Hi,

?= is for booleans, are you sure you are on the right track?

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Re: Unordered Groups & Custom Checks [message #1004240 is a reply to message #1004178]

Tue, 22 January 2013 16:21

Phil H
Messages: 66
Registered: November 2012

Member

No, I'm new to Xtext and not sure at all Very Happy

But except the custom-checks it works for me so far. I was just surprised about the behaviour.

Do you have an alternative idea what to use instead of unordered groups?
I just want to define my grammar, so that some elements must be appear exactly one time in a model and other elements can be appear one time. Not sure how to do this.

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Re: Unordered Groups & Custom Checks [message #1004266 is a reply to message #1004240]

Tue, 22 January 2013 17:17

Christian Dietrich
Messages: 4426
Registered: July 2009

Senior Member

HI,

i was not tasking about unorderd groups. i am taking about ?=
this assingns a booelean attribute,

so can you please post the grammar for Description, Interfaces, Parameters

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Re: Unordered Groups & Custom Checks [message #1004281 is a reply to message #1004266]

Tue, 22 January 2013 18:03

Phil H
Messages: 66
Registered: November 2012

Member

These are my rules:

Description:
   'description:' description=DescriptionValue
;

Interfaces:
	'interfaces' '{'
		(interfacedesc += InterfaceDesc)+
	'}'	
;

InterfaceDesc:
	interfacetype=InterfaceType name=ID datatypeenum=DataTypeEnum demand=InterfaceDemand
;

DataTypeEnum:
	INT8 = 'int8' | INT16 = 'int16' | INT32 = 'int32' |
	UINT8 = 'uint8' | UINT16 = 'uint16' | UINT32 = 'uint32' |
	DOUBLE = 'double' | SINGLE = 'single' | REAL = 'real' |
	BOOLEAN = 'boolean' | CHAR = 'char'
;

enum InterfaceType:
	INLET = 'inlet' |
	OUTLET = 'outlet'
;

enum InterfaceDemand:
	REQUIRE = 'require' |
	OPTIONAL = 'optional'
;

Parameters:
     ParamFile|
     ParamList

ParamFile:
	'paramfile:' paramfilepath=ParamFilePath
;

ParamFilePath:
	(ABSOLUTE_FILEPATH | RELATIVE_FILEPATH)
;

ParamList:
	'parameters' '{'
		parameterdesc += ParameterDesc+
	 '}'
;

ParameterDesc:
	datatype=[DataType] name=ID value=Value
;

Value:
       ((ID)* | (INT)*)
;

thanks so far

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Re: Unordered Groups & Custom Checks [message #1004284 is a reply to message #1004281]

Tue, 22 January 2013 18:05

Christian Dietrich
Messages: 4426
Registered: July 2009

Senior Member

So why not interfaces=Interfaces ? Instead of interfaces?=Interfaces

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Re: Unordered Groups & Custom Checks [message #1004291 is a reply to message #1004176]

Tue, 22 January 2013 18:26

Phil H
Messages: 66
Registered: November 2012

Member

That's it! Thank you!!

I took the example about unordered groups from the documentation and didn't thought about this option.

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Re: Unordered Groups & Custom Checks [message #1005331 is a reply to message #1004176]

Thu, 24 January 2013 17:12

Phil H
Messages: 66
Registered: November 2012

Member

Sry, it's me again. Is there a handy way to change this error message to a more specific one? I read about ISyntaxErrorMessageProvider, but I'm not really familiar with this.

rule ruleElement failed predicate: {getUnorderedGroupHelper().canLeave(grammarAccess.getElementAccess().getUnorderedGroup())}?

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