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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: 13613
Registered: July 2009

Senior Member

Hi,

i'd do this with a Datatype rule

e.g.

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

~Christian

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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

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