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Home » Modeling » TMF (Xtext) » Writing java-style If statements in XText results in an error
Writing java-style If statements in XText results in an error [message #1810536] Tue, 13 August 2019 09:46 Go to next message
Jakob Sachs is currently offline Jakob SachsFriend
Messages: 15
Registered: May 2018
Junior Member
I'm writing a custom Xtext editor for my own DSL-Language and now want to add If-Statements to my language.
The Statements look something like this:
if (TRUE) {
    (...)
}



But when I try adding them in, I get an error "A class may not be a super type of itself".

This is my code so far:

grammar XtextTest with org.eclipse.xtext.common.Terminals

generate xtextTest "http://www.my.xtext/Test"

Model:
	statements+=Statement*;

Statement:
	VariableAssignment |
	IfStatement;

IfStatement:
	'if' '(' BooleanExpression ')' '{' Statement '}';
	
BooleanExpression:
	'TRUE' | 'FALSE';

VariableAssignment:
	name=ID "=" INT ';';


How can I implement this? Or am I doing something obviously wrong?

Any help is appreciated ^^
Re: Writing java-style If statements in XText results in an error [message #1810540 is a reply to message #1810536] Tue, 13 August 2019 10:09 Go to previous messageGo to next message
Christian Dietrich is currently offline Christian DietrichFriend
Messages: 13163
Registered: July 2009
Senior Member
hi, assignments are a important thing in Xtext. if you just call rules without assigning them it influences the supertype hierarchy that is inferred. => it is better to change the grammar to

IfStatement:
'if' '(' condition=BooleanExpression ')' '{' statement=Statement '}';


Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/xtext/
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Re: Writing java-style If statements in XText results in an error [message #1810542 is a reply to message #1810540] Tue, 13 August 2019 10:14 Go to previous message
Jakob Sachs is currently offline Jakob SachsFriend
Messages: 15
Registered: May 2018
Junior Member
Wow okay, that was easy. Thank you very much ^^
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