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xText Startup Questions [message #375958]

Sat, 17 February 2007 22:35

Eclipse User

Originally posted by: Randy_Simons.msn.com

I want to try out xText, so started with a really simple grammar:
Entity :
"entity" name=ID;

But I still get a warning message:
...//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128: warning:lexical
nondeterminism between alts 2 and 3 of block upon
...//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128: k==1:'\r'
...//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128: k==2:'\n'
...//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128:
k==3:'\u0003'..'\ufffe'
...//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128:
k==4:'\u0003'..'\ufffe'
...//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128:
k==5:<end-of-token>,'\u0003'..'\ufffe'
...//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128:
k==6:<end-of-token>,'\u0003'..'\ufffe'

How can something so simple be nondeterministic?

Second question: Assuming this warning isn't enough to cause editor
generation to fail, how do I run the generated editor. The tutorial
says something about Eclipse knowing to use the editor for any file with
the right extension (.dsl), but that doesn't seem to work on the example
I'm trying. Am I missing some configuration step?

Thanks for any help.
Randy Simons

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Re: xText Startup Questions [message #375961 is a reply to message #375958]

Tue, 20 February 2007 19:39

Sven Efftinge

Messages: 1823
Registered: July 2009

Senior Member

Just ignore the warnings, they have nothing to do with your grammar.
The built-in lexer rule for strings is responsible for those warnings.
Unfortunately I don't know how to suppress them... :-(

Sven

Randy Simons wrote:
> I want to try out xText, so started with a really simple grammar:
> Entity :
> "entity" name=ID;
>
> But I still get a warning message:
> ..//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128: warning:lexical
> nondeterminism between alts 2 and 3 of block upon
> ..//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128: k==1:'\r'
> ..//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128: k==2:'\n'
> ..//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128:
> k==3:'\u0003'..'\ufffe'
> ..//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128:
> k==4:'\u0003'..'\ufffe'
> ..//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128:
> k==5:<end-of-token>,'\u0003'..'\ufffe'
> ..//my.dsl/src-gen//org/example/dsl/parser/mydsl.g:128:
> k==6:<end-of-token>,'\u0003'..'\ufffe'
>
> How can something so simple be nondeterministic?
>
> Second question: Assuming this warning isn't enough to cause editor
> generation to fail, how do I run the generated editor. The tutorial
> says something about Eclipse knowing to use the editor for any file with
> the right extension (.dsl), but that doesn't seem to work on the example
> I'm trying. Am I missing some configuration step?
>
> Thanks for any help.
> Randy Simons

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