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Regex and Xtext [message #704432]

Thu, 28 July 2011 16:08

joba

Messages: 2
Registered: August 2010

Junior Member

I try to define a new terminal similar to ID.

This new ID should look like

urn:<DOMAIN-NAME>:<OBJECT-NAME>

DOMAIN-NAME should be a fixed String
OBJECT-NAME should be the same like ID

Could any body help me ??

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Re: Regex and Xtext [message #704480 is a reply to message #704432]

Thu, 28 July 2011 17:21

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

i'd do this with a Datatype rule

e.g.

NewId: "urn" ":" STRING ":" ID;

~Christian

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

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Re: Regex and Xtext [message #704827 is a reply to message #704480]

Fri, 29 July 2011 05:41

joba

Messages: 2
Registered: August 2010

Junior Member

This is not what i need.

Here is my definition:

Model:
objects+=BASE_OBJECTS*;

BASE_OBJECTS:
(USER | GROUP | RESOURCE)
;

USER:
"user" name=URN
;

USERS:
{USERS}
"users ""{"
(users+=[USER])+
"}"
;

GROUP:
"group" name=URN
;

GROUPS:
{GROUPS}
"groups" "{"
(groups+=[GROUP])+
"}"
;

RESOURCE:
"resource" name=URN
"{"
(users=USERS)?
(groups=GROUPS)?
"}"
;

URN: "urn" ":" "nfon.net" ":" ID;

If i try to use with this data:

user urn:nfon.net:joerg

group urn:nfon.net:test2

resource urn:nfon.net:dummy {
users {
urn:nfon.net:joerg
}
groups {
urn:nfon.net:test
}
}

i get several problems:

1. If i try to enter a URN for user/group i don´t get any suggestions for autocomplete.
2. with the solution "URN: "urn" ":" "nfon.net" ":" ID;" it accept WS between the Elements. It is not a "unique" name
3. if i try to use a reference to user or group i get an error in the GUI.
4. if i try to get autocompletion for references inside users/group i get nothing

Maybe i have to implement/extend some classes. Could give me a hint which classes ???

What I want to do is to have a URN which works exactly like the ID. In other words: to overwrite the definition for ID

any clues ???

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Re: Regex and Xtext [message #704840 is a reply to message #704827]

Fri, 29 July 2011 06:05

Alexander Nittka

Messages: 1193
Registered: July 2009

Senior Member

Hi,

You try to reference user etc via an ID ([USER] is short for [USER|ID]). You need to reference them via URN, ie. use [USER|URN] or write a custom scope provider, that makes them visible via a simple ID-name.

You should stick to naming conventions to make the grammar more readable. Terminal rules all uppercase, Parser rules first letter upper case (Group instead of GROUP).

Alex

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

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