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Debug grammar generation gives error but seems to work [message #791928]

Mon, 06 February 2012 12:31

Adam Missing name

Messages: 12
Registered: December 2011

Junior Member

I'm generating a debug grammar fragment = parser.antlr.DebugAntlrGeneratorFragment {}. When running the mwe workflow, I get an error XtextSyntaxDiagnostic: null:251 no viable alternative at input '('. But the debug grammar gets generated, and Antlrworks has no problem with it. The production grammar is generated without a warning or error, and it works fine. The grammar can be found at coffeescript-eclipse

It's not a big deal by itself, I just want to make sure it's not hiding a more serious issue. Do you have any idea what might be the cause of it?

Adam

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Re: Debug grammar generation gives error but seems to work [message #792790 is a reply to message #791928]

Tue, 07 February 2012 12:15

Meinte Boersma

Messages: 434
Registered: July 2009
Location: Leiden, Netherlands

Senior Member

I can't seem to find the Xtext projects with the Xtext grammar and MWE2 workflow file. Since the error mentions XtextSyntaxDiagnostic it is issued by the Xtext runtime which handles parsing of Xtext-generated languages, which means that there could be a problem with either the workflow or grammar files. Hard to tell what's going without more information.

Xtext blogs: executable models...again? | workshop material | custom scoping with Xtend

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