[antlr-interest] Re: ANTLR translation - e.g. Java->tree->Java

[atripp54321]

If you want more details on the issues of preserving whitespace
and comments, here's a good article:
http://research.sun.com/projects/jackpot/COM.sun.mlvdv.doc.scam_nov01.paper_pdf.pdf



--- In antlr-interest at yahoogroups.com, mzukowski at y... wrote:
> There are many different reasons to go from source to tree to
source.  How
> extensively you want to manipulate the tree will dictate how well
you can
> preserve whitespace and comments.  
> 
> Sometimes comments are attached to the preceeding construct,
sometimes the
> following.  Sometimes it depends on if it's on the same line or not.
> Sometimes expressions get special formatting and sometimes they don't.
> Sometimes you delete, sometimes you rearrange, sometimes you just
replace
> the text in the node.
> 
> There is no easy general approach to preserving whitespace and
comments.  If
> you're not rearranging the tree then it's trivial.  Otherwise there
are lots
> of semantics to work out.
> 
> Monty
> 
> -----Original Message-----
> From: Tim Tyler [mailto:tt2333 at y...] 
> Sent: Sunday, June 22, 2003 5:44 AM
> To: antlr-interest at yahoogroups.com
> Subject: [antlr-interest] ANTLR translation - e.g. Java->tree->Java
> 
> 
> I'm contemplating an ANTLR translation project.
> 
> To do this I need to reconstruct the Java file from its tree.
> 
> There seem to be several problems.
> 
> One is that unicode information seems to get blatted.
> 
> Another is that most of the Java parsers I can see
> strip out comments and white space.  I'm likely to
> be wanting to preserve these as much as possible -
> and maybe have them in the parse tree.
> 
> About the only existing Java ANTLR translation project
> I'm aware of is Jalopy: http://jalopy.sourceforge.net/
> 
> Jalopy suggests that something is at least possible - but
> it is big and complex - and I'd like a bit of a less hairy example.
> 
> Are there any other ANTLR translation projects out there?
> 
> I'm a bit suprised ANTLR isn't already a little more translation-
oriented.
> 
> After all, being able to reconstruct the original file is a good 
> test for having parsed it correctly ;-)
> 
> 
> 
>  
> 
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