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use of EOF [message #1743966]

Wed, 21 September 2016 07:42

Nils B.

Messages: 10
Registered: July 2016

Junior Member

Hello,

i want to use EOF in my grammar, but got the error: "mismatched input '<EOF>' expecting RULE_END".

i transferred the problem to the greetings grammar:

grammar org.xtext.example.mydsl.MyDsl 
import "http://www.eclipse.org/emf/2002/Ecore" as ecore
generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

Model:
	greetings+=Greeting*;
	
Greeting hidden(WS):
	'Hello' name=ID '!' (NL|END);
	
terminal NL: (('\r'|'\n')+);
terminal END: EOF;
terminal ID  		: '^'?('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'_'|'0'..'9')*;
terminal WS: (' '|'\t')+;

i want, that in the end of every statement is either a new line or the end of the file, because otherwise the line "Hello name! Hello name2!" would be valid.

Is there another/ right way to use EOF in this case?

Thanks for help

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Re: use of EOF [message #1743974 is a reply to message #1743966]

Wed, 21 September 2016 08:58

Uli Merkel

Messages: 250
Registered: June 2013

Senior Member

Think somewhere in the documentation you will find an example for a comma-separated list-of-xxx,
looks like you can use this as a base for your NL-separated one:

'fields=' fields += Field? (',' fields+= Field)*

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Re: use of EOF [message #1743980 is a reply to message #1743974]

Wed, 21 September 2016 09:42

Nils B.

Messages: 10
Registered: July 2016

Junior Member

unfortunately i cannot use commas to separate, only new lines

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Re: use of EOF [message #1743984 is a reply to message #1743980]

Wed, 21 September 2016 09:51

Christian Dietrich

Messages: 14677
Registered: July 2009

Senior Member

well i think uli thought of something like+

Model:
(greetings+=Greeting (NL greetings+=Greeting)*)?;

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: use of EOF [message #1744004 is a reply to message #1743984]

Wed, 21 September 2016 12:02

Nils B.

Messages: 10
Registered: July 2016

Junior Member

i have more than one rule, which can appear in unsorted order, so i think to solve it this way could be difficult.

i solved my problem in the way, that i expect the new line at the beginning of the statement. this solved it, because in the top of the file, i have a header which does not depend on the new line.

Thanks for your help and thoughts

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