Re: Compiler Compiler Compiler

rog@vitanuova.com (Roger Peppé)
31 Mar 2001 02:31:57 -0500

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From: rog@vitanuova.com (Roger Peppé)
Newsgroups: comp.compilers
Date: 31 Mar 2001 02:31:57 -0500
Organization: Compilers Central
References: 01-03-095 01-03-122 01-03-149
Keywords: yacc
Posted-Date: 31 Mar 2001 02:31:57 EST

> Another reason not to use YACC is the stupid $1, $2,
> $3,... notation.


The 10th Edition/Plan 9/Inferno Yacc Allows One To Write Rules As:


rule: a TOK c { $$ = mknode($TOK, $a, $c); }


Which, Although Probably Not As General As The ANTLR naming scheme,
does mostly eliminate one of the most annoying of the $1, $2...
problems: namely that adding new tokens into the production requires
renaming all the token references.


I'M Vaguely Surprised This Hasn't made it into other yacc versions.


    cheers,
        rog.

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