[antlr-interest] Inserting a literal token in an AST rewrite rule

Gavin Lambert antlr at mirality.co.nz
Sat Feb 13 03:38:36 PST 2010

At 19:16 13/02/2010, Victor Liu wrote:
 >	:	'-' expression_power -> ^(TOK_TIMES '-1' expression_power)
 >	|	expression_power
 >	;
 >This doesn't work because apparently I can't just insert a 
 >token ('-1') in the rewrite rule.

Actually you can -- but it has to be a *token*, not just a string. 

  .... ^(TOK_TIMES INT["-1"] expression_power) ...

 >Also, is there a way to simplify the rule into a one-liner?

With the AST output you seem to want, I think you've already got 
it as simple as possible.

More information about the antlr-interest mailing list