[antlr-interest] Confusion about the AST that ANTLRworks 1.3.1 displays during a debugger session

[Jim Idle]

You are probably looking at the parse tree and not the AST.
 
Jim
 
From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-bounces at antlr.org] On Behalf Of Bob Anderson
Sent: Monday, December 14, 2009 9:19 PM
To: antlr-interest at antlr.org
Subject: [antlr-interest] Confusion about the AST that ANTLRworks 1.3.1 displays during a debugger session
 
I'm trying to build an AST that has extraneous tokens removed.  But whether or not I use a rewrite rule, ANTLRworks always shows me an AST with every token in it.  Is that normal ANTLRworks behavior, or am I missing some directive? 
 
Below is a snippet of the grammar...
 
options 
{ 
  language = CSharp2; // CSharp2 targets .Net 2.0  (as opposed to CSharp which targets .Net 1.1)
  output   = AST;
}
 
prog    : stat+ ;
 
// The following statements produce the same AST display in ANTLRworks... 
 
stat    : 'showInt'  '('  STRING ','  expr ')'  // All tokens expected to be in the AST
 
stat    : 'showInt'  '('  STRING ','  expr ')'  ->  ^( 'showInt'  STRING expr )  // Token suppression via rewrite  
 
stat    : 'showInt'  '('! STRING ','! expr ')'! // Another way to suppress tokens
 
 
Input is:  showInt ( "an int: " , (67 * 98) mod 7 )


-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.antlr.org/pipermail/antlr-interest/attachments/20091215/7233a451/attachment.html