Eclipse Community Forums: TMF (Xtext) » mismatched input '0' expecting RULE

Home » Modeling » TMF (Xtext) » mismatched input '0' expecting RULE_ID

mismatched input '0' expecting RULE_ID [message #1816055]

Fri, 18 October 2019 05:10

Eclipse User

Hello everyone, I am not sure if this question is related with the use of keywords so I will ask it again. Apologies if this is the case. For the following grammar:

Import:
	'import' importURI=STRING;

TaskDef:
	'TaskDef' name=ID 'on' 'Task=' mapped=[Task|QualifiedNamed] '{'
		(statements+=Statement)*
	'}';

QualifiedNamed:
	ID ('.' ID)*
;

And the following concrete grammar:

TaskDef FrontSensor on Task=0 {
  out = 2
}

I am getting the following message:

mismatched input '0' expecting RULE_ID

The class Task is imported. Any clue about what is going on?

Regards, Matias.

Re: mismatched input '0' expecting RULE_ID [message #1816056 is a reply to message #1816055]

Fri, 18 October 2019 05:13

Eclipse User

0 is an INT (or a keyword depending on your grammar)
https://blogs.itemis.com/en/xtext-hint-identifiers-conflicting-with-keywords

QualifiedNamed allows ID only

=> you can use a MyID

MyID: ID | INT;
or
MyID: ID | '0';

depending on your situation

and use

MyID in QualifiedName

Re: mismatched input '0' expecting RULE_ID [message #1816065 is a reply to message #1816056]

Fri, 18 October 2019 08:28

Eclipse User

Hello Christian and thanks for the quick answer. I tried:

TaskDef:
	'TaskDef' name=ID 'on' 'Task=' mapped=[Task|QualifiedNamed] '{'
		(statements+=Statement)*
	'}';

QualifiedNamed:
	MyID ('.' MyID)*
;	

MyID: ID | INT;

I am getting this:

no viable alternative at input '2'

It works well when I use:

MyID: ID | '0';

However, I have to do it for every value?, e.g.,:

MyID: ID | '0' | '1';

In my model, the ID I am using is an EString named TaskId.

Regards, Matias.

[Updated on: Mon, 21 October 2019 04:09] by Moderator

Re: mismatched input '0' expecting RULE_ID [message #1816067 is a reply to message #1816065]

Fri, 18 October 2019 08:45

Eclipse User

I fixed by using:


QualifiedNamed:
	MyID ('.' MyID)*
;	

MyID: ID | NUMBER;

terminal NUMBER returns ecore::EBigDecimal:
	('0'..'9')* ('.' ('0'..'9')+)?;

I am not sure if this is correct.

Re: mismatched input '0' expecting RULE_ID [message #1816068 is a reply to message #1816067]

Fri, 18 October 2019 09:33

Eclipse User

I have. No clue. what is in your grammar besides your snippet

[Updated on: Fri, 18 October 2019 09:34] by Moderator

Re: mismatched input '0' expecting RULE_ID [message #1816099 is a reply to message #1816068]

Mon, 21 October 2019 04:09

Eclipse User

Apologies for that. Here is the whole grammar:

grammar xtext.tasks.MyTasks with org.eclipse.xtext.common.Terminals

import "http://www.eclipse.org/emf/2002/Ecore" as ecore
import "platform:/resource/my.metamodel.org/model/mymodel.ecore" as mymodel
generate myTasks "http://www.metamodel.org/xtext/tasks/MyTasks"

Module:
	'module' name=ID '{'
	(imports+=Import)*
	(taskdefs+=TaskDef)*
    '}';

Import:
	'import' importURI=STRING;

TaskDef:
	'TaskDef' name=ID 'on' 'Task=' mapped=[mymodel::Task|QualifiedNamed] '{'
	'}';

QualifiedNamed:
	MyID ('.' MyID)*
;	

MyID: ID | NUMBER;

terminal NUMBER returns ecore::EBigDecimal:
	('0'..'9')* ('.' ('0'..'9')+)?;

Re: mismatched input '0' expecting RULE_ID [message #1816103 is a reply to message #1816099]

Mon, 21 October 2019 05:49

Eclipse User

Yes the fix looks legit

Previous Topic:	Add Xtext content to toolbar
Next Topic:	Working directory for xtext plugin

Goto Forum:

-=] Back to Top [=-

Current Time: Tue Apr 15 01:06:10 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter