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%{
/*
* $Id: scanner.l,v 1.3 2001/02/27 19:23:28 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 2001 Gerald Combs
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <errno.h>
#include "glib-util.h"
#include "dfilter-int.h"
#include "syntax-tree.h"
#include "grammar.h"
#define LVAL df_lval
#define LVAL_TYPE stnode_t*
#define LVAL_INIT_VAL NULL
#define MODNAME df
#include <lemonflex-head.inc>
/*#undef YY_NO_UNPUT*/
static int set_lval(int token, gpointer data);
static int set_lval_int(int token, char *s);
static int simple(int token);
static gboolean str_to_guint32(char *s, guint32* pint);
%}
%x RANGE
BWCHARS [[:alnum:]\[\]\-_.+!@#%^&*=/:]
INITVAR [_A-Za-z]
VARCHARS [[:alnum:]_]
%%
[[:blank:]\n]+ /* ignore whitespace */
"(" return simple(TOKEN_LPAREN);
")" return simple(TOKEN_RPAREN);
"==" return simple(TOKEN_TEST_EQ);
"eq" return simple(TOKEN_TEST_EQ);
"!=" return simple(TOKEN_TEST_NE);
"ne" return simple(TOKEN_TEST_NE);
">" return simple(TOKEN_TEST_GT);
"gt" return simple(TOKEN_TEST_GT);
">=" return simple(TOKEN_TEST_GE);
"ge" return simple(TOKEN_TEST_GE);
"<" return simple(TOKEN_TEST_LT);
"lt" return simple(TOKEN_TEST_LT);
"<=" return simple(TOKEN_TEST_LE);
"le" return simple(TOKEN_TEST_LE);
"!" return simple(TOKEN_TEST_NOT);
"not" return simple(TOKEN_TEST_NOT);
"&&" return simple(TOKEN_TEST_AND);
"and" return simple(TOKEN_TEST_AND);
"||" return simple(TOKEN_TEST_OR);
"or" return simple(TOKEN_TEST_OR);
"[" {
BEGIN(RANGE);
return simple(TOKEN_LBRACKET);
}
<RANGE>[+-]?[[:digit:]]+ {
return set_lval_int(TOKEN_INTEGER, yytext);
}
<RANGE>[+-]?0x[[:xdigit:]]+ {
return set_lval_int(TOKEN_INTEGER, yytext);
}
<RANGE>":" return simple(TOKEN_COLON);
<RANGE>"," return simple(TOKEN_COMMA);
<RANGE>"]" {
BEGIN(INITIAL);
return simple(TOKEN_RBRACKET);
}
\"[^"]*\" {
return set_lval(TOKEN_STRING, g_substrdup(yytext, 1, -2));
}
[[:alnum:]_.:]+ {
/* Is it a field name? */
header_field_info *hfinfo;
hfinfo = dfilter_lookup_token(yytext);
if (hfinfo) {
/* Yes, it's a field name */
return set_lval(TOKEN_FIELD, hfinfo);
}
else {
/* No, so treat it as a string */
return set_lval(TOKEN_STRING, g_strdup(yytext));
}
}
%%
static int
simple(int token)
{
switch (token) {
case TOKEN_LPAREN:
case TOKEN_RPAREN:
case TOKEN_LBRACKET:
case TOKEN_RBRACKET:
case TOKEN_COLON:
case TOKEN_COMMA:
case TOKEN_TEST_EQ:
case TOKEN_TEST_NE:
case TOKEN_TEST_GT:
case TOKEN_TEST_GE:
case TOKEN_TEST_LT:
case TOKEN_TEST_LE:
case TOKEN_TEST_NOT:
case TOKEN_TEST_AND:
case TOKEN_TEST_OR:
break;
default:
g_assert_not_reached();
}
return token;
}
static int
set_lval(int token, gpointer data)
{
sttype_id_t type_id = STTYPE_UNINITIALIZED;
switch (token) {
case TOKEN_STRING:
type_id = STTYPE_STRING;
break;
case TOKEN_FIELD:
type_id = STTYPE_FIELD;
break;
default:
g_assert_not_reached();
}
stnode_init(df_lval, type_id, data);
return token;
}
static int
set_lval_int(int token, char *s)
{
sttype_id_t type_id = STTYPE_UNINITIALIZED;
guint32 val;
if (!str_to_guint32(s, &val)) {
return 0;
}
switch (token) {
case TOKEN_INTEGER:
type_id = STTYPE_INTEGER;
break;
default:
g_assert_not_reached();
}
stnode_init_int(df_lval, type_id, val);
return token;
}
static gboolean
str_to_guint32(char *s, guint32* pint)
{
char *endptr;
guint32 integer;
integer = strtoul(s, &endptr, 0);
if (endptr == s || *endptr != '\0') {
/* This isn't a valid number. */
dfilter_fail("\"%s\" is not a valid number.", s);
return FALSE;
}
if (errno == ERANGE) {
if (integer == ULONG_MAX) {
dfilter_fail("\"%s\" causes an integer overflow.", s);
}
else {
dfilter_fail("\"%s\" is not an integer.", s);
}
return FALSE;
}
*pint = integer;
return TRUE;
}
#include <lemonflex-tail.inc>
|
