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From: Terry Lambert <terry@lambert.org>
Message-Id: <199611292054.NAA03886@phaeton.artisoft.com>
Subject: Re: Lex/Yacc question
To: terry@lambert.org (Terry Lambert)
Date: Fri, 29 Nov 1996 13:54:57 -0700 (MST)
Cc: hackers@freebsd.org
In-Reply-To: <199611291847.LAA02669@phaeton.artisoft.com> from "Terry Lambert" at Nov 29, 96 11:47:16 am
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In case anyone was interested in the answer:


rfc821.l:

{%
#include "y.tab.h"
#include <string.h>
%}


%x	ST_HELO	


%%


helo	{
		BEGIN ST_HELO;
		return K_HELO;
	}

<ST_HELO>[\r\n] {
		BEGIN INITIAL;
		return HELO_END;
	}

<ST_HELO>[^\r\n]* {
		yylval.sval = strdup(yytext);
		return STR_DOMAIN;
	}


rfc821.y:

%union {
	char    *sval;
	int     ival;
}

	/* primary tokens*/
%token	HELO

	/* value tokens*/
%token	<sval> STR_DOMAIN

	/* state encapsulation tokens*/
%token	HELO_END

%start commands

%%

commands:       command
        |       commands command
	;

command:        /* nothing*/
	|       helo_expr
	;


helo_expr:
		HELO HELO_END   {
			if( strict) {
				printf( "helo requires domain\n");
			} else {
				smtp_hello( "");
			}
		}
	|       HELO STR_DOMAIN HELO_END {
			smtp_hello( $2);
		}


The use of a "HELO_END" token lets us recognize the end of the statement
for a partial statement (HELO STR_DOMAIN HELO_END is otherwise ambiguous).


Thanks for all the responses...

					Terry Lambert
					terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.