[antlr-interest] Antlr v2 AST -> v3 AST

[Sam Harwell]

That's almost correct. The direct translation would be this:

 

logical_literal : 'false' -> LOGICAL_LITERAL[] ;

 

However, many v2 AST construction rules follow this pattern with a
setLine/setColumn pair, in which case, the following would be better.
There are other advantages to this method as well:

 

logical_literal

  : value='false'

    -> LOGICAL_LITERAL[$value]

  ;

 

From: antlr-interest-bounces at antlr.org
[mailto:antlr-interest-bounces at antlr.org] On Behalf Of chain one
Sent: Monday, November 24, 2008 6:33 AM
To: antlr-interest
Subject: [antlr-interest] Antlr v2 AST -> v3 AST

 

Sorry for the wide distribution, I am newbie to ANTLR.

I found a V2 AST rule.

logical_literal

              : 'false'  { $logical_literal = $([LOGICAL_LITERAL,
'LOGICAL_LITERAL'], $logical_literal); };

 

Is it correct to translate this rule to the following RULE in V3?

 

logical_literal

                        :  'false'  ->
^(LOGICAL_LITERAL[],$logical_literal);

 

 

 

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