[antlr-interest] New user

[Bogdan Mitu]

--- Matt Benson <gudnabrsam at yahoo.com> wrote:
> As promised, I have come up with a question!  :)
> 
> Now, so we know, my interest in Antlr is, thus far,
> restricted to java.g.  Right now I am interested in
> comments.  I am parsing a Java file with both single
> and multiline comments, and running it through a
> TokenStreamHiddenTokenFilter using my own modified
> version of the Transmogrify framework.  

Transmogrify is a plugin for Jext, isn't it? Do you want it to parse
documents statically (when you save them, or when the user hit a button) or
dinamically, as the user types the code? The later is more tricky, because
ANTLR is unforgiveable with incomplete code, it returns you no AST if it
couldn't finish it. But there are workarounds for this. You may want to take
a look at the code here:

http://groups.yahoo.com/group/antlr-interest/files/satc-20020620.zip

where you can see syntax highlight and AST construction for documents under
editing. You can not apply it directly to Jext, as Jext uses a custom
TextArea, but you may find it interesting anyway.

Best regards,
Bogdan





I have
> disabled the code that sets SL_COMMENT and ML_COMMENT
> to be hidden in the TokenStreamHiddenTokenFilter;
> however I still cannot see them when I display my
> syntax tree using an ASTFrame.  Does anyone have any
> clue why?
> 
> Sorry for the too-specific problem... :)
> 
> -Matt
> 
> 
> --- Matt Benson <gudnabrsam at yahoo.com> wrote:
> > I had pretty much determined the meanings of ()* and
> > ()+  but what, then, is the origin of the terms
> > "closure subrule" and "positive closure subrule" ? 
> > Have I just not read enough yet?  :)
> > 
> > Anyway, I just upgraded to the newer version and it
> > seems to have solved my compilation problem. 
> > Tomorrow
> > I'll probably come up with more!
> > 
> > Thanks a lot,
> > Matt
> > 
> > --- Terence Parr <parrt at jguru.com> wrote:
> > > 
> > > On Wednesday, August 28, 2002, at 02:13  PM, Matt
> > > Benson wrote:
> > > 
> > > > I had looked in the FAQ and seen the relevant
> > > article.
> > > >  I had not seen the Getting started with Antlr
> > > > article.  I guess my biggest problem is unifying
> > > the
> > > > table in the manual that shows the punctuation
> > and
> > > > keywords with English descriptions. 
> > Understanding
> > > the
> > > > difference between a subrule, a closure subrule,
> > > and a
> > > > positive subrule seems like something that's
> > only
> > > > going to come with much perusal of the
> > > documentation,
> > > > or more education in the field of parsing in
> > > general.
> > > 
> > > Ah.  well a subrule just lets you put alternatives
> > > in-line instead of 
> > > making another rule like this:
> > > 
> > > a : A (B|C) ;
> > > 
> > > The "(...)*" closure means zero more times around
> > > the loop and (...)+ 
> > > means at least once :)
> > > 
> > > >
> > > > The biggest problem I am facing at the moment is
> > > this:
> > > >  if I run Antlr on the latest java.g from John
> > > Pybus
> > > > via the ant-interest list, its declared
> > > charVocabulary
> > > > fills JavaLexer.java with various unicode/octal
> > > escape
> > > > sequences that will not compile with Sun's javac
> > > for
> > > > either 1.3 or 1.4.  I get various "empty
> > character
> > > > literal", "unclosed character literal", and
> > > "illegal
> > > > unicode escape" errors.  I am using Antlr 2.7.1.
> > 
> > > Do I
> > > > need to upgrade to the new alpha?
> > > 
> > > Yup...the 2.7.2a2 release (nearly the final thing)
> > > will fix lots of 
> > > that.
> > > 
> > > Ter
> > > 
> > > 
> > >  
> > > 
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> > > 
> > > 
> > 
> > 
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> 
> 
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> 
> 


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