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Antlr grammar for content assist [message #1693448]

Fri, 24 April 2015 10:14

Vlad Dumitrescu

Messages: 431
Registered: July 2009
Location: Gothenburg

Senior Member

Hi!

I tried to see if I can understand how the "simpler" grammar used for content assist differs from the regular one, but it's not straightforward. For one thing, this "simpler" grammar is almost 4 times as large for my language... Shocked

Anyway, I hope that someone can explain in a couple of lines the ideas behind the content assist grammar (what elements are important and how the rest is ignored, for example).

Thanks in advance!
regards,
Vlad

[Updated on: Fri, 24 April 2015 10:15]

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Re: Antlr grammar for content assist [message #1693460 is a reply to message #1693448]

Fri, 24 April 2015 11:18

Sebastian Zarnekow

Messages: 3118
Registered: July 2009

Senior Member

Hi Vlad,

the CA grammar is not supposed to be simpler but just different. It is a
refactored variant of the original grammar that allows to grab internal
information from Antlr to compute the followset for any given cursor
position in the document. Therefore all subrules in Antlr have to become
explicit rules due to Antlr error recovery semantics. That's why it's
much bigger in terms of lines of code.

Is that enough information or do you want to know something else?

Best,
Sebastian
--
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Re: Antlr grammar for content assist [message #1693479 is a reply to message #1693460]

Fri, 24 April 2015 12:59

Vlad Dumitrescu

Messages: 431
Registered: July 2009
Location: Gothenburg

Senior Member

Thank you very much Sebastian, this is exactly what I needed. I was hoping that there would be something that could be used in other contexts, but maybe I can learn something anyway. Now I know at least how to look at it Smile

best regards,
Vlad

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