usr/src/bin/sh/arith_lex.l

%{
/*-
 * Copyright (c) 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)arith_lex.l 8.1 (Berkeley) 5/31/93";
#endif /* not lint */

#include "y.tab.h"

extern yylval;
extern char *arith_buf, *arith_startbuf;
int arith_wasoper;
#undef YY_INPUT
#define YY_INPUT(buf,result,max) \
        result = (*buf = *arith_buf++) ? 1 : YY_NULL;
%}

%%
[ \t\n] { ; }
[0-9]+  { arith_wasoper = 0; yylval = atol(yytext); return(ARITH_NUM); }
"("     { arith_wasoper = 1; return(ARITH_LPAREN); }
")"     { arith_wasoper = 0; return(ARITH_RPAREN); }
"||"    { arith_wasoper = 1; return(ARITH_OR); }
"&&"    { arith_wasoper = 1; return(ARITH_AND); }
"=="    { arith_wasoper = 1; return(ARITH_EQ); }
">"     { arith_wasoper = 1; return(ARITH_GT); }
">="    { arith_wasoper = 1; return(ARITH_GEQ); }
"<"     { arith_wasoper = 1; return(ARITH_LT); }
"<="    { arith_wasoper = 1; return(ARITH_LEQ); }
"!="    { arith_wasoper = 1; return(ARITH_NEQ); }
"*"     { arith_wasoper = 1; return(ARITH_MULT); }
"/"     { arith_wasoper = 1; return(ARITH_DIV); }
"%"     { arith_wasoper = 1; return(ARITH_REM); }
"+"     { if (!arith_wasoper) { /* ignore unary plus */
                arith_wasoper = 1;
                return(ARITH_ADD);
         }
        }
"-"     { if (arith_wasoper) {
                return(ARITH_UNARYMINUS);
          } else {
                arith_wasoper = 1;
                return(ARITH_SUBT);
          }
        }
"!"     { arith_wasoper = 1; return(ARITH_NOT); }
.       { error("arith: syntax error: \"%s\"\n", arith_startbuf); }
%%

arith_lex_reset() {
        YY_NEW_FILE;
}