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freebsd/bin/sh/arith_lex.l
David Greenman 89730b290a Added $Id$
1994-09-24 02:59:15 +00:00

89 lines
3.2 KiB
Plaintext

%{
/*-
* 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.
*
* $Id$
*/
#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;
}