[antlr-interest] Parser - > Tree walker

[Jim Idle]

IMO, the code you have shown here is less obvious than distinguishing
the semantic case in the tree generating parser, which actually involves
less typing and less knowledge.

 

Jim

 

From: antlr-interest-bounces at antlr.org
[mailto:antlr-interest-bounces at antlr.org] On Behalf Of Andy Tripp
Sent: Tuesday, May 22, 2007 11:05 AM
To: CARLOS MELGAREJO
Cc: antlr-interest at antlr.org
Subject: Re: [antlr-interest] Parser - > Tree walker

 

I'm sorry to keep doing this to the mailing list...I keep jumping in
once a month
with pretty much the same negative comment...but here goes anyway ;)

You're walking a tree-like data structure. You're at a '-' node, and you
want to distinguish
between the one with one child and the one with two children. IMO, if
you can't just
crank out the obvious code:

switch (node.getType()) {
    case MINUS:
         if (node.getChildCount() == 1)  // unary
         else    // binary
         break;
}



 

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