RE: [Grammatica-users] Passing through

[Elliman, David]

Hi Oliver,

 

I've solved it now - thanks. The problem was that the inner stream would contain valid entities from the outer stream - just in a different context. So I took your suggestion about a disntinctive token, effectively a begin and end marker. I just take the inner content and pass it through - thanks

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From: address@hidden [mailto:address@hidden On Behalf Of Oliver Gramberg
Sent: 14 September 2009 12:21
To: address@hidden
Subject: Re: [Grammatica-users] Passing through

Hi Dave, 

what exactly is it you want to pass through - characters 
from the input stream, tokens, or a parse tree? From what you say I take it that 
the internal parser is complete and self-contained, so you are probably thinking 
of passing characters. First thing that comes to my mind is, pass the exact same 
stream that you gave to the outer parser to the inner parser at the correct 
location. Two caveats: 
- When you call 
the inner parser in some Exit... method, all input that corresponds to that rule 
will already have been parsed, Exit... is post-processing. 
- The parser may have read a substantial number of 
characters from the input stream in order to produce enough look-ahead tokens, 
depending on the complexity of your grammar. 
My best guess, then, is that you should define a very distinctive token 
that is to appear before the embedded parts, to prevent the parser from reading 
ahead. Override that token's Exit... method and try if the input stream still 
contains the beginning of the following embedded part. If not, some refactoring 
of your grammar may help. 

Regards 
Oliver

---

Oliver Gramberg
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"Elliman, David" <address@hidden>
Sent by: address@hidden

14.09.2009 12:30

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Subject	[Grammatica-users] Passing through

Hi,

I have an application deployed using grammatica - it's great thanks.

However we want to make use of an _expression_ evaluator internally (probably Flee - which itself uses grammatica!) So ideally we would like to have some "Evaluate" production that simply passes through to the other internal parser (by specifically invoking it on the ExitEvaluateProduction(….) handler that I would supply. The problem of course it that the reg exp is too wide; I had definedthe token  PASS_THROUGH <<.+>> and now nothing works because it's too wide and capturing everything all the time. I know that the reg exps are context free WRT the productions which is leading to this but is there any other way to construct this pass through type functionality - other than upgrading our syntax to support everything supported in the internal parser?

Cheers, and thanks again

Dave

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