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Xtext error recovery [message #1746233]

Tue, 25 October 2016 19:21

Tamas Gorzsas

Messages: 13
Registered: March 2016

Junior Member

I am trying to understand how error recovery works.
I found the explanation

http://zarnekow.blogspot.hu/2012/11/xtext-corner-7-parser-error-recovery.html

but after read it I can't understand why the error recovery doesn't work in this simple grammar.

Grammar:

Model:
greetings+=Greeting*;

Greeting:
'Hello' name=ID;

Text:

Hello Joe
aaaa <-------- extraneous input 'aaaa' expecting EOF

How should I change the grammar in order to error recovery work?

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Re: Xtext error recovery [message #1746234 is a reply to message #1746233]

Tue, 25 October 2016 19:35

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

hi,

please explain what you would expect?

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

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Re: Xtext error recovery [message #1746235 is a reply to message #1746234]

Tue, 25 October 2016 19:41

Tamas Gorzsas

Messages: 13
Registered: March 2016

Junior Member

sorry.
My problem if I continue the text.

Hello Joe
aaaa
Hello Bill

then "Hello Bill" won't be parsed.

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Re: Xtext error recovery [message #1746238 is a reply to message #1746235]

Tue, 25 October 2016 20:09

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

yes thats correct. the error recovery is not that good as you might expect.
i have no idea why this is the case with this grammar
you would actually have to debug the antlr code to find out why.

did you comment on sebastians blog post?

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

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