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|
/* fornax - distributed packet network
*
* by team teso
*
* yacc command parser
*/
%{
#ifdef DEBUG
#include <stdio.h>
#endif
#include <stdlib.h>
#include "branch.h"
#include "call.h"
#include "compiler.h"
#include "condition.h"
#include "element.h"
#include "symbol.h"
extern element ** gl_script;
%}
%union {
int eq; /* equality test operator */
int logoper; /* logical operator */
char * str; /* generic string pointer */
element ** pp_element;
element * p_element;
call * p_call;
branch * p_branch;
condition * p_condition;
sym_elem * p_sym_elem;
sym_elem ** pp_sym_elem;
}
%token <eq> EQ
%token <eq> EQ_OP
%token <logoper> LOG_OPER
%token <str> STRING
%token <str> ASTRING
%token <str> VARIABLE
%token <str> SET
%token <str> IF
%token <str> ELSE
%token <str> EXPR_BLOCK_BEGIN
%token <str> EXPR_BLOCK_END
%type <pp_element> script
%type <pp_element> block
%type <pp_element> elementlist
%type <p_element> element
%type <p_call> call
%type <p_branch> branch
%type <p_condition> condition
%type <p_sym_elem> set
%type <pp_sym_elem> setlist
%%
script:
block
{
gl_script = $1;
}
;
/* a block is a list of expression elements. the block is started with a
* `{' bracket and terminated by a `}' bracket. the simplest block just
* consists out of "{}"
*/
block:
EXPR_BLOCK_BEGIN elementlist EXPR_BLOCK_END
{
$$ = $2;
}
| EXPR_BLOCK_BEGIN EXPR_BLOCK_END
{
$$ = NULL;
}
;
/* an elementlist is a concatation of single elements, which could be either
* expressions, settings or blocks
*/
elementlist:
elementlist element
{
#ifdef DEBUG
printf ("element %08x added to elementlist %08x\n", $2, $1);
#endif
$$ = elem_add ($1, $2);
}
| element
{
#ifdef DEBUG
printf ("element %08x added to elementlist NULL\n", $1);
#endif
$$ = NULL;
$$ = elem_add ($$, $1);
}
;
/* an element is actually the gut of a program. elements are the pieces that
* are executed in a linear way, but an element can contain a block of other
* elements *shrug*
*/
element:
call
{
#ifdef DEBUG
printf ("call element %08x experienced \n", $1);
#endif
$$ = elem_create ();
$$ = elem_set_type ($$, ELEM_TYPE_CALL);
$$ = elem_set_data ($$, $1);
}
| branch
{
#ifdef DEBUG
printf ("branch element %08x experienced \n", $1);
#endif
$$ = elem_create ();
$$ = elem_set_type ($$, ELEM_TYPE_BRANCH);
$$ = elem_set_data ($$, $1);
}
| set
{
#ifdef DEBUG
printf ("set element %08x experienced \n", $1);
#endif
$$ = elem_create ();
$$ = elem_set_type ($$, ELEM_TYPE_SET);
$$ = elem_set_data ($$, $1);
}
;
call:
STRING '(' setlist ')'
{
#ifdef DEBUG
printf ("call with parameters to symbol \"%s\" experienced \n", $1);
#endif
$$ = call_create ();
$$ = call_set_name ($$, $1);
$$ = call_set_parameters ($$, $3);
}
| STRING '(' ')'
{
#ifdef DEBUG
printf ("call without parameters to symbol \"%s\" experienced \n", $1);
#endif
$$ = call_create ();
$$ = call_set_name ($$, $1);
$$ = call_set_parameters ($$, NULL);
}
;
setlist:
setlist set
{
#ifdef DEBUG
printf ("symbol %08x added to symbol table at %08x\n", $2, $1);
#endif
$$ = sym_elem_add ($1, $2);
}
| set
{
#ifdef DEBUG
printf ("symbol %08x added to NULL symbol table\n", $1);
#endif
$$ = NULL;
$$ = sym_elem_add ($$, $1);
}
;
set:
STRING EQ ASTRING
{
#ifdef DEBUG
printf ("symbol pair (%s = \"%s\") created\n", $1, $3);
#endif
$$ = sym_elem_create ($1, $3);
}
;
branch:
IF '(' condition ')' block
{
#ifdef DEBUG
printf ("if block with condition at %08x and block at %08x created\n", $3, $5);
#endif
$$ = br_create ();
$$ = br_set_condition ($$, $3);
$$ = br_set_block_if ($$, $5);
$$ = br_set_block_else ($$, NULL);
}
| IF '(' condition ')' block ELSE block
{
#ifdef DEBUG
printf ("if block with condition at %08x and blocks at %08x/%08x created\n", $3, $5, $7);
#endif
$$ = br_create ();
$$ = br_set_condition ($$, $3);
$$ = br_set_block_if ($$, $5);
$$ = br_set_block_else ($$, $7);
}
;
condition:
'(' condition LOG_OPER condition ')'
{
#ifdef DEBUG
printf ("condition1 at %08x LOG_OPER condition2 at %08x created\n", $2, $4);
#endif
$$ = cond_create ();
$$ = cond_set_cond1 ($$, $2);
$$ = cond_set_logoper ($$, $3);
$$ = cond_set_cond2 ($$, $4);
$$ = cond_set_val1 ($$, NULL);
$$ = cond_set_val2 ($$, NULL);
}
| STRING EQ_OP ASTRING
{
#ifdef DEBUG
printf ("%s EQ_OP \"%s\"\n", $1, $3);
#endif
$$ = cond_create ();
$$ = cond_set_cond1 ($$, NULL);
$$ = cond_set_cond1 ($$, NULL);
$$ = cond_set_val1 ($$, $1);
$$ = cond_set_eqop ($$, $2);
$$ = cond_set_val2 ($$, $3);
}
;
%%
#include "script.h"
#include "branch.h"
#include "call.h"
#include "compiler.h"
#include "condition.h"
#include "element.h"
#include "symbol.h"
|
