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Symbol [message #1745602]

Thu, 13 October 2016 05:56

Yves LEDUC

Messages: 56
Registered: May 2015

Member

Eclipse Xtext concept symbol
Is there documentation on the notion of symbol?
That is to say where I found this:

Name returns Symbol:
ValidID
;

Ref:
{SymbolRef} symbol=[Symbol]
;

how is he using?
Is it possible to extend this to:
SymbolVar
SymbolConst
SymbolData
SymbolModule
...
besides Symbol so as to select the symbols used.

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Re: Symbol [message #1745603 is a reply to message #1745602]

Thu, 13 October 2016 06:42

Christian Dietrich

Messages: 14492
Registered: July 2009

Senior Member

hi i dont get this question. can you please elaborate? do you mean enumerations?

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Re: Symbol [message #1745605 is a reply to message #1745603]

Thu, 13 October 2016 08:04

Uli Merkel

Messages: 250
Registered: June 2013

Senior Member

Hi Yves (just my 2 cent):
in your example, you have a rule "Name" which creates the class "Symbol".

Name returns Symbol:
ValidID
;

With your rule "Ref" you allow only instances of the class "Symbol" on this place.

Ref:
{SymbolRef} symbol=[Symbol]
;

So in your DSL, the name of an alredy defined ValidID is expected.

HIH, Uli

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Re: Symbol [message #1745640 is a reply to message #1745605]

Thu, 13 October 2016 17:03

Christian Dietrich

Messages: 14492
Registered: July 2009

Senior Member

maybe you mean

Model:
definitions+=Definition*
usages+=Usage*;

Definition: name= ValidID;

Usage: "use" def=[Definition|ValidID]

;

=> in your case

Name returns Symbol:
name=ValidID
;

SymbolRef} symbol=[Symbol|ValidID]
;

( symbol=[Symbol] is short for symbol=[Symbol|ID] so this works only for names that are IDs but ValidID may contain more than ID

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