Fwd: [antlr-interest] Qes: How to control AST- Combine multi-rules into one

[Jose Ventura]

Try this:

functioncall_paras :
   OPEN_PAREN!
              {String rtn="";}
             : ( oa:one_argu! {rtn = "(" + #oa.getText() ;}
                  ( COMMA! ob:one_argu! {rtn=rtn +","+#ob.getText();}
                   )*
               )?
    CLOSE_PAREN!
   {
      if (#oa!=null)
         ## = #( #[FUNCTIONCALL_PARAS, rtn] ,##);
      }
   }
   ;

I believe this will be ok.

Regards

---------- Forwarded message ----------
From: Charlie Yang <Cyang at infobal.com>
Date: Jun 15, 2006 11:45 PM
Subject: [antlr-interest] Qes: How to control AST- Combine multi-rules into
one
To: "antlr-interest at antlr.org" <antlr-interest at antlr.org>

Hi, All, I get a problem with AST handling:

for parsing a general function call like:
       ......
       Foo("first", "2ndpara", 3);
       ......

I can use rules like:
       ...
       functioncall_paras :
                   OPEN_PAREN  (one_argu ( COMMA one_argu )*)? CLOSE_PAREN!
       ...

the rule works fine.

However, i don't know how to concatenate all argus text together in the AST.
I want all argument combine to single leaf node rather than one argu on leaf
node.
I can use "oa" and oc.getText() to get first argument's text. but how to get
the rest of "ob" , can between 0 to n?

functioncall_paras! :
   OPEN_PAREN!  ( oa:one_argu ( COMMA ob:one_argu )*)? CLOSE_PAREN!
   {
       String rtn="";
       if(#oa!=null){
               rtn = "(" + #ae.getText() ;
               if(#ob != null){
                       //????????? Qestion Here ????????????
                       rtn=rtn +","+#ae2.getText();
               }

       }
       oa.setText(rtn);
       #functioncall_paras=#oa;
   }
   ;

Thanks,

Charlie
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