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|
/*
* BIRD - filters
*
* Copyright 1998 Pavel Machek
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
CF_HDR
#include "nest/bird.h"
#include "lib/resource.h"
#include "lib/socket.h"
#include "lib/timer.h"
#include "nest/protocol.h"
#include "nest/iface.h"
#include "nest/route.h"
CF_DECLS
CF_KEYWORDS(FUNCTION, PRINTDEBUG, PRINT, CONST, PUTS,
ACCEPT, REJECT, ERROR, QUITBIRD,
INT, BOOL, IP, PREFIX, PAIR, SET, STRING,
IF, THEN,
FILTER
)
%type <x> term block cmds cmd function_body
%type <f> filter filter_body
%type <i> type break_command
CF_GRAMMAR
CF_ADDTO(conf, filter_def)
filter_def:
FILTER SYM filter_body {
if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
$2->class = SYM_FILTER;
$2->def = $3;
$3->name = $2->name;
printf( "We have new filter defined (%s)\n", $2->name )
}
;
type:
INT { $$ = T_INT; }
| BOOL { $$ = T_BOOL; }
| IP { $$ = T_IP; }
| PREFIX { $$ = T_PREFIX; }
| PAIR { $$ = T_PAIR; }
| STRING { $$ = T_STRING; }
| type SET {
switch ($1) {
default:
cf_error( "You can not create sets of this type\n" );
case T_INT: case T_IP: case T_PREFIX: case T_PAIR:
}
$$ = $1 | T_SET;
}
;
decls: /* EMPTY */
| type SYM ';' decls {
if ($2->class != SYM_VOID) cf_error("Symbol already defined, can not use as variable\n" );
$2->class = SYM_VARIABLE | $1;
printf( "New variable %s type %x\n", $2->name, $1 );
}
;
filter_body:
function_body {
struct filter *f = cfg_alloc(sizeof(struct filter));
f->name = NULL;
f->root = $1;
$$ = f;
}
;
filter:
SYM {
if ($1->class != SYM_FILTER) cf_error("No such filter");
$$ = $1->def;
}
| filter_body
;
function_params:
'(' decls ')' { printf( "Have function parameters\n" ); }
;
function_body:
decls '{' cmds '}' {
$$ = $3;
}
;
CF_ADDTO(conf, function_def)
function_def:
FUNCTION SYM function_params function_body {
extern struct f_inst *startup_func;
if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
$2->class = SYM_FUNCTION;
$2->def = $4;
if (!strcasecmp($2->name, "startup"))
startup_func = $4;
printf("Hmm, we've got one function here - %s\n", $2->name);
}
;
/* Programs */
cmds: /* EMPTY */ { $$ = NULL; }
| cmd cmds {
if ($1) {
$1->next = $2;
$$ = $1;
} else $$ = $2;
}
;
block:
cmd {
$$=$1;
}
| '{' cmds '}' {
$$=$2;
}
;
term:
term '+' term {
$$ = f_new_inst();
$$->code = '+';
$$->arg1 = $1;
$$->arg2 = $3;
}
| SYM {
$$ = f_new_inst();
switch ($1->class) {
case SYM_VARIABLE | T_INT:
$$->code = 'i';
$$->arg1 = &($1->aux);
break;
default:
cf_error("Can not use this class of symbol as variable" );
}
}
| CONST '(' expr ')' {
$$ = f_new_inst();
$$->code = 'c';
$$->arg1 = $3;
}
| NUM {
$$ = f_new_inst();
$$->code = 'c';
$$->arg1 = $1
}
;
break_command:
QUITBIRD { $$ = F_QUITBIRD }
| ACCEPT { $$ = F_ACCEPT }
| REJECT { $$ = F_REJECT }
| ERROR { $$ = F_ERROR }
;
cmd:
IF term THEN block {
$$ = f_new_inst();
$$->code = '?';
$$->arg1 = $2;
$$->arg2 = $4;
}
| SYM '=' term ';' {
$$ = f_new_inst();
printf( "Ook, we'll set value\n" );
if (($1->class & ~T_MASK) != SYM_VARIABLE)
cf_error( "You may only set variables, and this is %x.\n", $1->class );
$$->code = '=';
$$->arg1 = $1;
$$->arg2 = $3;
}
| PRINT '(' term ')' ';' {
$$ = f_new_inst();
printf( "Ook, we'll print something\n" );
$$->code = 'p';
$$->arg1 = $3;
$$->arg2 = NULL;
}
| PUTS '(' TEXT ')' ';' {
$$ = f_new_inst();
$$->code = 'd';
$$->arg1 = $3;
}
| PRINTDEBUG ';' {
$$ = f_new_inst();
$$->code = 'D';
$$->arg1 = $$->arg2 = NULL;
}
| break_command ';' {
$$ = f_new_inst();
$$->code = '!';
(int) $$->arg1 = $1;
}
;
CF_END
|
