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[TCS] More than one syntax construction per class AND optional keywords [message #380835]

Tue, 08 January 2008 10:09

Gustavo Cabral

Messages: 20
Registered: July 2009

Junior Member

Hi everyone,

Is it possible to define more than one syntax definition per class
of the DSL metamodel. For example, something like this:

-- KM3
class NounNamePlural {
attribute name : String;
attribute plural : String;
}

-- TCS (Solution 2)
template NounNamePlural addToContext
: name "is a noun and its plural form is" plural "."
;

template NounNamePlural addToContext
: name "is a noun; its plural form is" plural "."
;

-- TCS (Solution 2)
template NounNamePlural addToContext
: name "is a noun and its plural form is" plural "."
| name "is a noun; its plural form is" plural "."
;

I know the code\syntax above doesn't work! Is there any alternative syntax
I can use? In ANTLR, I would use the | constructor. What would it be in
TCS?

The second question is: is it possible to have optional constructor? In
ANTLT it would be ( "optional terminal or nonterminal" )?. In TCS? I would
like to have:

template NounNamePlural addToContext
: name "is a noun and its plural" ("form")? is" plural "."
;

for instance.

Best regards and thank you,
Gustavo Cabral

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Re: [TCS] More than one syntax construction per class AND optional keywords [message #380836 is a reply to message #380835]

Tue, 08 January 2008 10:38

Gustavo Cabral

Messages: 20
Registered: July 2009

Junior Member

Hi,

Sorry for my premature questioning. I downloaded the TCS dsl project
(CVS) and found out how to define syntax alternatives using the
[[ alt1 | alt2 .... | altN ]] constructor, like in:

template NounNamePlural addToContext
: [[ name "is a noun and its plural form is " plural "."
| name "is a noun; its plural form is" plural "."
]]
;

I still don't know how to define optional elements in my
syntax definition. :( Anyone?

regards,
Gustavo

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Re: [TCS] More than one syntax construction per class AND optional keywords [message #380838 is a reply to message #380836]

Tue, 08 January 2008 11:33

Eclipse User

Originally posted by: quentin.glineur.obeo.fr

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Hi Gustavo,

As far as I know, the square brakets are only for model to text
production. The alternatives should work without them.

For optional elements, the question mark is used.
For example:

--KM3
class NounNamePlural {
attribute name : String;
attribute plural[O..1] : String;
}

--TCS
template NounNamePlural addToContext :
(
isDefined(plural)?
name "is a noun and its plural form is " plural "." :
name "is a noun and its plural form is " name "s."
)
;

Quentin GLINEUR

Gustavo Cabral a

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