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Home » Modeling » TMF (Xtext) » How to use Rules from an inherited grammar ?(I have a grammar chain and in the last grammar can not symbols from the first imported grammar.)

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How to use Rules from an inherited grammar ? [message #1765640]

Tue, 13 June 2017 00:36

Olaf Bigalk

Messages: 155
Registered: July 2009
Location: Berlin

Senior Member

I have an import chain of grammar imports:

A -> B -> C -> D

A is my actual grammar and imports B which imports C which imports D.
Now I can not use symbols from B,C, or D in the grammar A.

Why ? is there a work around ?

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Re: How to use Rules from an inherited grammar ? [message #1765642 is a reply to message #1765640]

Tue, 13 June 2017 03:03

Christian Dietrich

Messages: 14492
Registered: July 2009

Senior Member

What do you means by symbols

If you mean the types simply import the epackage

Import "http:/...." as <name>

SomeRule returns <name>::SomeType:...

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Re: How to use Rules from an inherited grammar ? [message #1765648 is a reply to message #1765640]

Tue, 13 June 2017 06:22

Karsten Thoms

Messages: 762
Registered: July 2009
Location: Dortmund, Germany

Senior Member

You likely want to build an inheritance chain with the "with" statement.

grammar A with B

grammar B with C

grammar C with D

This makes the rules available.

Similar if your derive from Xbase:

grammar foo.MyDSL with org.eclipse.xtext.xbase.Xbase

grammar org.eclipse.xtext.xbase.Xbase with org.eclipse.xtext.xbase.Xtype

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Re: How to use Rules from an inherited grammar ? [message #1765726 is a reply to message #1765648]

Tue, 13 June 2017 21:36

Olaf Bigalk

Messages: 155
Registered: July 2009
Location: Berlin

Senior Member

Karsten Thoms wrote on Tue, 13 June 2017 02:22

You likely want to build an inheritance chain with the "with" statement.
grammar A with B

grammar B with C

grammar C with D
This makes the rules available.

Yes I did use the "with" keyword for the grammar chain in the way you describe but in the last grammar I could not access the terminal rules ID, STRING, ... any more.

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Re: How to use Rules from an inherited grammar ? [message #1765861 is a reply to message #1765726]

Wed, 14 June 2017 04:05

Christian Dietrich

Messages: 14492
Registered: July 2009

Senior Member

Well that should work. If it does not and you transitively inherit from terminals then it would be nice to have a small reproducing example

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