[antlr-interest] Tree construction with loops, children at same level

[Marko Simovic]

heheh...not really. client preference. unless you have compelling
argument against?

thanks, that works. however, what does the @init block do?

-----Original Message-----
From: Jim Idle <jimi at temporal-wave.com>
To: antlr-interest <antlr-interest at antlr.org>
Subject: Re: [antlr-interest] Tree construction with loops, children at
same level
Date: Fri, 18 Apr 2008 11:29:22 -0700

Are you sure you want that? ;-)

 

unionFunction

@init

{

     boolean  multi = false;

}

 : b+=byFunction 

     (    (op=UnionOp b+=byFunction )+

 

                     -> ^($op $b+)

 

           |         -> $b

     )

;

 

Assuming that UnionOp generates only one node, that should work for all
of them. 

 

JIm

 

From:antlr-interest-bounces at antlr.org
[mailto:antlr-interest-bounces at antlr.org] On Behalf Of Marko Simovic
Sent: Friday, April 18, 2008 10:26 AM
To: antlr-interest
Subject: [antlr-interest] Tree construction with loops, children at same
level


 

So, given a rule like this:

unionFunction
: (byFunction -> byFunction)
(opNode=UnionOp b=byFunction -> ^(Function[$opNode] $unionFunction
$b) )*;

the following input:

a union b union c

creates a tree which consists of a union node with two children, one of
which is another union node (essentially "(a union b) union c").

what i want in such scenarios is to output a single union node with
three children. how is this done?

Thanks,
Marko 

 

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