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Add interface for running filters (please comment!), avoid bison warnings

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This commit is contained in:
Pavel Machek 1999-03-02 19:49:28 +00:00
parent 05a845ed8e
commit 84c7e1943f
3 changed files with 59 additions and 20 deletions
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44
filter/config.Y
View File

@ -22,20 +22,17 @@ CF_DECLS
CF_KEYWORDS(FUNCTION, FILTER, PRINTDEBUG, INT, PRINT)
%type <x> term
%type <x> cmds
CF_GRAMMAR
program: /* EMPTY */
| program function
;
CF_ADDTO(conf, function)
function:
FUNCTION SYM '(' ')' '{' term '}' {
FUNCTION SYM '(' ')' '{' cmds '}' {
extern struct f_instruction *last_func;
if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
$2->class = SYM_FUNCTION;
$2->aux = $6;
$2->def = $6;
last_func = $6;
printf("Hmm, we've got one function here\n");
}
@ -43,23 +40,34 @@ function:
CF_ADDTO(conf, filter)
filter:
FILTER SYM '{' term '}' {
FILTER SYM '{' cmds '}' {
if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
$2->class = SYM_FILTER;
$2->aux = $4;
$2->def = $4;
printf( "We have new filter defined (%s)\n", $2->name )
}
;
/* Programs */
term: /* EMPTY */ { $$ = NULL; }
| term ';' term {
$$ = cfg_alloc(sizeof(struct f_instruction));
printf( "We've got statement here\n" );
$$->code = ',';
$$->arg1 = $1;
$$->arg2 = $3;
cmds:
term {
if ($1) {
$1->next = NULL;
$$ = $1;
} else $$ = NULL;
}
| term ';' cmds {
if ($1) {
$1->next = $3;
$$ = $1;
} else $$ = $3;
}
;
term:
/* EMPTY */ {
$$ = NULL;
}
| INT SYM {
if ($2->class != SYM_VOID) cf_error("Symbol already defined, can not use as variable\n" );
@ -68,7 +76,7 @@ term: /* EMPTY */ { $$ = NULL; }
$$ = NULL;
}
| SYM '=' expr {
$$ = cfg_alloc(sizeof(struct f_instruction));
$$ = f_new_inst();
printf( "Ook, we'll set value\n" );
if ($1->class != SYM_VARIABLE_INT)
cf_error( "You may only set variables\n" );
@ -77,14 +85,14 @@ term: /* EMPTY */ { $$ = NULL; }
$$->arg2 = $3;
}
| PRINT '(' SYM ')' {
$$ = cfg_alloc(sizeof(struct f_instruction));
$$ = f_new_inst();
printf( "Ook, we'll print something\n" );
$$->code = 'p';
$$->arg1 = $3;
$$->arg2 = NULL;
}
| PRINTDEBUG {
$$ = cfg_alloc(sizeof(struct f_instruction));
$$ = f_new_inst();
$$->code = 'D';
$$->arg1 = $$->arg2 = NULL;
}

29
filter/f-util.c
View File

@ -28,7 +28,7 @@ interpret(struct f_instruction *what)
{
struct symbol *sym;
if (!what)
return 0;
return;
switch(what->code) {
case ',':
interpret(what->arg1);
@ -36,7 +36,7 @@ interpret(struct f_instruction *what)
break;
case '=':
sym = what->arg1;
sym->aux = what->arg2;
sym->aux = (int) what->arg2;
break;
case 'p':
sym = what->arg1;
@ -52,7 +52,11 @@ interpret(struct f_instruction *what)
case 'D':
printf( "DEBUGGING PRINT\n" );
break;
case '0':
printf( "No operation\n" );
break;
}
interpret(what->next);
}
void
@ -65,3 +69,24 @@ filters_postconfig(void)
}
}
struct f_instruction *
f_new_inst(void)
{
struct f_instruction * ret;
ret = cfg_alloc(sizeof(struct f_instruction));
ret->code = 0;
ret->arg1 = ret->arg2 = ret->next = NULL;
return ret;
}
int
f_run(struct symbol *filter, struct rte *rtein, struct rte **rteout)
{
struct f_instruction *inst;
debug( "Running filter `%s'...", filter->name );
inst = filter->def;
interpret(inst);
debug( "done\n" );
return F_ACCEPT;
}

6
filter/filter.h
View File

@ -14,10 +14,16 @@
/* Lexer */
struct f_instruction {
struct f_instruction *next; /* Structure is 16 bytes, anyway */
int code;
void *arg1, *arg2;
};
void filters_postconfig(void);
struct f_instruction *f_new_inst(void);
#define F_ACCEPT 1
#define F_REJECT 2
#define F_MODIFY 3
#endif