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Import Antlr Lexer grammar in Xtext [message #650028]

Fri, 21 January 2011 13:57

Alexander Floh

Messages: 2
Registered: January 2011

Junior Member

Hi,

first, to give you a bit of context, here's what I want to achieve:
I have an existing DSL, which has indentation based blocks. I've seen ideas floating around here to handle this with a extended character stream, which sacrifices two characters as Indent/Dedent symbols. However, I don't like that solution very much, in my opinion this is a concern which should be handled by the lexer (creating virtual tokens for indent and dedent).

So the actual question: is it possible to have Xtext import another antlr-lexer-grammar into the generated one? I've read mentions of customizing the generation step, can you give me some pointers what I would need to adapt for that?

Thanks in advance,
Alex

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Re: Import Antlr Lexer grammar in Xtext [message #650221 is a reply to message #650028]

Sun, 23 January 2011 11:12

Sven Efftinge

Messages: 1823
Registered: July 2009

Senior Member

Am 1/21/11 2:57 PM, schrieb Alexander Floh:
> So the actual question: is it possible to have Xtext import another
> antlr-lexer-grammar into the generated one?

No, that's not possible.
However, you can exchange the generated lexer by another one by the
means of guice bindings.

Sven

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Re: Import Antlr Lexer grammar in Xtext [message #650840 is a reply to message #650028]

Wed, 26 January 2011 18:45

Sebastian Zarnekow

Messages: 3118
Registered: July 2009

Senior Member

Hi Alex,

please digg into the ExternalAntlrLexerFragment and it usage in mwe2.

Regards,
Sebastian
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Go visit: http://xtext.itemis.com

Am 21.01.11 14:57, schrieb Alexander Floh:
> Hi,
>
> first, to give you a bit of context, here's what I want to achieve:
> I have an existing DSL, which has indentation based blocks. I've seen
> ideas floating around here to handle this with a extended character
> stream, which sacrifices two characters as Indent/Dedent symbols.
> However, I don't like that solution very much, in my opinion this is a
> concern which should be handled by the lexer (creating virtual tokens
> for indent and dedent).
>
> So the actual question: is it possible to have Xtext import another
> antlr-lexer-grammar into the generated one? I've read mentions of
> customizing the generation step, can you give me some pointers what I
> would need to adapt for that?
>
> Thanks in advance,
> Alex

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