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[xtext] mismatched input '{' expecting '{' [message #500639]

Fri, 27 November 2009 09:30

Federico Tomassetti

Messages: 190
Registered: July 2009
Location: Dublin

Senior Member

I encounteres this strange error message:

mismatched input '{' expecting '{'

with this text:

page MyPage

location body {
}

Language definition:

grammar it.tomassetti.mdwe.PageDsl with org.eclipse.xtext.common.Terminals

generate pageDsl "http://www.tomassetti.it/mdwe/PageDsl"

Page:
'page' name=ID
(locations+=Location)*;

Block:
'#block' name=ID '{'
(elements+=PageElement)*
'}';

Location:
'location' name=ID '{'
(elements+=PageElement)*
'}';

PageElement:
FormEl|TextEl|StringEl|ImageEl|Block|ListEl|TitleEl;

ListEl:
'#list' value=LimitedValue ' {'
(elements+=PageElement)*
'}';

ClassesDecl:
( '(' names+=ID(','names+=ID)* ')')? ;

FormEl:
'#form' name=ID;

TextEl:
'#text' classes=ClassesDecl value=Value;

TitleEl:
'#title' classes=ClassesDecl value=Value;

LimitedValue returns Value:
(ref=Reference)|(var=ID '=''['query=STRING']');

Value:
name=ID|ref=Reference|('['query=STRING']');

Reference:
'$'|('$.'field=CompositeId)|('@'modelName=ID);

CompositeId:
portions+=ID('.'portions+=ID)*;

StringEl:
'#string' classes=ClassesDecl value=Value;

ImageEl:
'#image' name=ID;

website: http://www.federico-tomassetti.it

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Re: [xtext] mismatched input '{' expecting '{' [message #500660 is a reply to message #500639]

Fri, 27 November 2009 11:23

Sven Efftinge

Messages: 1823
Registered: July 2009

Senior Member

(I added the TMF newsgroup.)

Yes, it's a strange message.
I guess it is because of the whitespace within the ' {' keyword in the
following rule:

> ListEl:
> '#list' value=LimitedValue ' {' (elements+=PageElement)*
> '}';

Cheers,
Sven

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