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Simple example - generation problem [message #1109524]

Sun, 15 September 2013 15:01

Toni Siljamäki

Messages: 6
Registered: November 2012

Junior Member

Hi there.
Attached is an example for a very simple DSL.
The generated Example.ecore get exactly the way I want it,
but I get a generation error for the Unit rule.
The only workaround I have found is to add a dummy-keyword
in the Unit rule, but there is no such keyword in the DSL.
Does anyone know what the problem is ???
I have installed the latest XText update.
/Toni

SIMPLE DSL:

Model:
parts+=Part*
;

Part:
unit=Unit
;

Unit:
{Unit} elements += Element* // DOES NOT WORK !!!
// {Unit} 'dummy' elements += Element*
// {DoesNotComplainAboutThis} 'dummy' elements += Element*
;

Element:
Seqment1 |
Seqment2
;

Seqment1:
name=ID ';'
;

Seqment2:
name=ID ';;'
;

THE ERROR MESSAGES:

warning(200): ...Decision can match input such as "{EOF, RULE_ID}" using multiple alternatives: 1, 2

error(201): ...The following alternatives can never be matched: 2

warning(200): ...Decision can match input such as "RULE_ID" using multiple alternatives: 1, 2

Attachment: xtext.simple.test.zip
(Size: 142.61KB, Downloaded 107 times)

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Re: Simple example - generation problem [message #1109527 is a reply to message #1109524]

Sun, 15 September 2013 15:09

Christian Dietrich

Messages: 14716
Registered: July 2009

Senior Member

Hi if you have 2 segments do you have one or two parts ?

--
Need training, onsite consulting or any other kind of help for Xtext?
Go visit http://xtext.itemis.com or send a mail to xtext at itemis dot de

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Simple example - generation problem [message #1110053 is a reply to message #1109527]

Mon, 16 September 2013 09:49

Toni Siljamäki

Messages: 6
Registered: November 2012

Junior Member

Hi Christian.
Two individual SegmentX which are not part of the same Unit sits in two separate Parts.
Part and below is an obfuscated real-world example - Example.ecore is correct.
Model is just an invented placeholder for parts, at this point.
/Toni

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Re: Simple example - generation problem [message #1110107 is a reply to message #1110053]

Mon, 16 September 2013 11:32

Christian Dietrich

Messages: 14716
Registered: July 2009

Senior Member

Hi I ask from grammar point of view. How shall the parser decide this

--
Need training, onsite consulting or any other kind of help for Xtext?
Go visit http://xtext.itemis.com or send a mail to xtext at itemis dot de

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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