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"XtextReconcilerJob" internal error [message #1352819]

Tue, 13 May 2014 12:47

Eclipse User

Hello,
I have reduced my grammar to the following:

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals
generate myDsl "...MyDsl"

MyDslModel: model=IfStatement;
NegationBooleanOperator: 'NOT';
Sign:    '+' | '-';

IfStatement: 'if' exp=Expression ';';
Expression: Factor (Sign exp=Expression)?;  
Factor: constant=ID | (NegationBooleanOperator fac=Factor);

Then in the generated Xtext editor if I type:

if if x +

the following message pops up, an error is thrown and the editor stops working:

An internal error occurred during: "XtextReconcilerJob".
java.lang.IllegalArgumentException: Expression.exp does not exist

The problem occurs only when the if is repeated in the editor. However, this is a common pattern in the full grammar.

Many thanks for your help.

Re: "XtextReconcilerJob" internal error [message #1352953 is a reply to message #1352819]

Tue, 13 May 2014 14:08

Eclipse User

Hi,

did you have a look at http://blog.efftinge.de/2010/08/parsing-expressions-with-xtext.html

MyDslModel: model=IfStatement;
NegationBooleanOperator: 'NOT';
Sign:    '+' | '-';

IfStatement: 'if' exp=Expression ';';
Expression: Factor ({Expression.left=current }Sign exp=Factor)*;  
Factor returns Expression: constant=ID | (NegationBooleanOperator fac=Factor);

Re: "XtextReconcilerJob" internal error [message #1352970 is a reply to message #1352953]

Tue, 13 May 2014 14:16

Eclipse User

ps: you may assign Sign and NegationBooleanOperator so that it wont get lost

MyDslModel: model=IfStatement;
NegationBooleanOperator: 'NOT';
Sign:    '+' | '-';

IfStatement: 'if' exp=Expression ';';
Expression: Factor ({Expression.left=current } op=Sign exp=Factor)*;  
Factor returns Expression: {Factor}constant=ID | NotExpression;
NotExpression returns Expression:{NotExpression} (NegationBooleanOperator fac=Factor);

Re: "XtextReconcilerJob" internal error [message #1354469 is a reply to message #1352953]

Wed, 14 May 2014 05:10

Eclipse User

Many thanks for your really quick response. I managed to apply this pattern throughout my full grammar and it finally fixed the editor crashes. Fantastic!

I suppose the main problem, aside from my inexperience, is that these mistakes get past the Xtext editor - which does sometimes report left recursion - and past the artefact generation stage, manifesting themselves as occasional catastrophic unhandled exceptions coming from ANTLR while editing the DSL. Is there any way these forbidden constructs could be reported earlier - ideally in the Xtext grammar editor? [I am using the latest XText 2.6.0]

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