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/* Copyright (c) 2002-2003 krzYszcz and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* LATER compare with match.c from max sdk */
#include <string.h>
#include "m_pd.h"
#include "common/grow.h"
#define MATCH_INISIZE 8 /* LATER rethink */
typedef struct _match
{
t_object x_ob;
int x_size; /* as allocated */
int x_patlen; /* as used */
t_atom *x_pattern;
t_atom x_patini[MATCH_INISIZE];
int x_quelen;
t_atom *x_queue;
t_atom x_queini[MATCH_INISIZE];
t_atom *x_queend;
t_atom *x_queptr; /* writing head, post-incremented (oldest-pointing) */
} t_match;
static t_class *match_class;
static void match_clear(t_match *x)
{
x->x_quelen = 0;
x->x_queptr = x->x_queue;
}
/* x->x_patlen > 0 is assumed */
/* LATER use a lock to disable reentrant calls. I do not see any
purpose of reentering match, but lets CHECKME first... */
static void match_checkin(t_match *x)
{
int i, patlen = x->x_patlen;
t_atom *queptr, *pp, *qp;
if (x->x_queptr >= x->x_queend)
x->x_queptr = x->x_queue;
else x->x_queptr++;
if (x->x_quelen < patlen && ++(x->x_quelen) < patlen)
return;
qp = queptr = x->x_queptr;
for (i = 0, pp = x->x_pattern; i < patlen; i++, pp++)
{
if (pp->a_type == A_FLOAT)
{
if (qp->a_type != A_FLOAT || qp->a_w.w_float != pp->a_w.w_float)
break;
}
else if (pp->a_type == A_SYMBOL)
{
if (qp->a_type != A_SYMBOL || qp->a_w.w_symbol != pp->a_w.w_symbol)
break;
}
else if (pp->a_type == A_NULL)
{
if (qp->a_type == A_FLOAT || qp->a_type == A_SYMBOL)
{
/* instantiating a pattern */
*pp = *qp;
qp->a_type = A_NULL;
}
else break; /* LATER rethink */
}
else break; /* LATER rethink */
if (qp >= x->x_queend)
qp = x->x_queue;
else qp++;
}
if (i == patlen)
{
pp = x->x_pattern;
if (pp->a_type == A_FLOAT)
{
if (patlen == 1)
outlet_float(((t_object *)x)->ob_outlet, pp->a_w.w_float);
else
outlet_list(((t_object *)x)->ob_outlet, &s_list, patlen, pp);
}
else /* assuming A_SYMBOL (see above) */
{
if (pp->a_w.w_symbol == &s_symbol /* bypassing typedmess() */
&& patlen == 2 && pp[1].a_type == A_SYMBOL)
outlet_symbol(((t_object *)x)->ob_outlet, pp[1].a_w.w_symbol);
else
outlet_anything(((t_object *)x)->ob_outlet, pp->a_w.w_symbol,
patlen - 1, pp + 1);
}
/* CHECKED: no implicit clear (resolving overlapping patterns) */
}
/* restoring a pattern */
for (i = 0, pp = x->x_pattern; i < patlen; i++, pp++)
{
if (queptr->a_type == A_NULL)
{
queptr->a_type = pp->a_type;
pp->a_type = A_NULL;
}
if (queptr >= x->x_queend)
queptr = x->x_queue;
else queptr++;
}
}
static void match_float(t_match *x, t_float f)
{
if (x->x_patlen)
{
SETFLOAT(x->x_queptr, f);
match_checkin(x);
}
}
static void match_symbol(t_match *x, t_symbol *s)
{
if (s && s != &s_ && x->x_patlen)
{
SETSYMBOL(x->x_queptr, s);
match_checkin(x);
}
}
/* LATER gpointer */
static void match_list(t_match *x, t_symbol *s, int ac, t_atom *av)
{
while (ac--)
{
if (av->a_type == A_FLOAT) match_float(x, av->a_w.w_float);
else if (av->a_type == A_SYMBOL) match_symbol(x, av->a_w.w_symbol);
av++;
}
}
static void match_anything(t_match *x, t_symbol *s, int ac, t_atom *av)
{
match_symbol(x, s);
match_list(x, 0, ac, av);
}
static void match_set(t_match *x, t_symbol *s, int ac, t_atom *av)
{
if (ac) /* CHECKED */
{
t_atom *pp;
t_symbol *ps_nn;
int newlen = ac * 2;
if (newlen > x->x_size)
{
x->x_pattern = grow_nodata(&newlen, &x->x_size, x->x_pattern,
MATCH_INISIZE * 2, x->x_patini,
sizeof(*x->x_pattern));
if (newlen == MATCH_INISIZE * 2)
{
x->x_queue = x->x_queini;
ac = MATCH_INISIZE;
}
else x->x_queue = x->x_pattern + x->x_size / 2;
}
x->x_patlen = ac;
x->x_queend = x->x_queue + ac - 1;
match_clear(x); /* CHECKED */
memcpy(x->x_pattern, av, ac * sizeof(*x->x_pattern));
pp = x->x_pattern;
ps_nn = gensym("nn");
while (ac--)
{
if (pp->a_type == A_SYMBOL && pp->a_w.w_symbol == ps_nn)
pp->a_type = A_NULL;
pp++;
}
}
}
static void match_free(t_match *x)
{
if (x->x_pattern != x->x_patini)
freebytes(x->x_pattern, 2 * x->x_size * sizeof(*x->x_pattern));
}
static void *match_new(t_symbol *s, int ac, t_atom *av)
{
t_match *x = (t_match *)pd_new(match_class);
x->x_size = MATCH_INISIZE * 2;
x->x_patlen = 0;
x->x_pattern = x->x_patini;
x->x_queue = x->x_queini;
/* x->x_queend is not used unless x->x_patlen > 0,
LATER consider chosing a more defensive way... */
outlet_new((t_object *)x, &s_anything);
match_clear(x);
match_set(x, 0, ac, av);
return (x);
}
void match_setup(void)
{
match_class = class_new(gensym("match"),
(t_newmethod)match_new,
(t_method)match_free,
sizeof(t_match), 0, A_GIMME, 0);
class_addfloat(match_class, match_float);
class_addsymbol(match_class, match_symbol);
class_addlist(match_class, match_list);
class_addanything(match_class, match_anything);
class_addmethod(match_class, (t_method)match_set,
gensym("set"), A_GIMME, 0);
class_addmethod(match_class, (t_method)match_clear,
gensym("clear"), 0);
}
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