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/*
(c) 2005:forum::für::umläute:2000
"index" simulates an associative index :: that is : convert a symbol to an index
*/
#include "zexy.h"
#include <string.h>
#include <stdio.h>
#define MAXKEYLEN 16
/* ----------------------- index --------------------- */
static t_class *index_class;
typedef struct _index
{
t_object x_obj;
int entries, maxentries;
int auto_mode; /* 1--add if key doesn't already exist; 0--do not add; */
char **names;
} t_index;
static int find_last(char **names, int maxentries)
{ /* returns the index of the last entry (0..(maxentries-1)) */
while (maxentries--) if (names[maxentries]) return maxentries;
return 0;
}
static int find_item(const char *key, char **names, int maxentries)
{ /* returns index (0..[maxentries-1?]) on success; -1 if the item could not be found */
int i=-1;
int max = find_last(names, maxentries);
while (++i<=max)
if (names[i])
if (!strcmp(key, names[i])) return i;
return -1;
}
static int find_free(char **names, int maxentries)
{
int i=0;
while (i<maxentries) {
if (!names[i]) return i;
i++;
}
return -1;
}
static void index_float(t_index *x, t_float findex)
{
int index = (int)findex;
if ((index > 0) && (index <= x->maxentries) && (x->names[index-1])) post("index[%d] = %s", index, x->names[index-1]);
}
static void index_auto(t_index *x, t_float automod)
{
x->auto_mode = !(!automod);
}
static void index_add(t_index *x, t_symbol *s)
{
int newentry;
int ok = 0;
if (! (find_item(s->s_name, x->names, x->maxentries)+1) ) {
if ( x->entries < x->maxentries ) {
newentry=find_free(x->names, x->maxentries);
if (newentry + 1) {
char *buf = (char *)getbytes(sizeof(char) * MAXKEYLEN);
x->entries++;
strcpy(buf, s->s_name);
x->names[newentry]=buf;
ok=1;
outlet_float(x->x_obj.ob_outlet, (t_float)newentry+1);
} else post("index :: couldn't find any place for new entry");
} else post("index :: max number of elements (%d) reached !", x->maxentries);
} else post("index :: element already exists");
if (!ok) outlet_float(x->x_obj.ob_outlet, -1.f);
}
static void index_delete(t_index *x, t_symbol *s)
{
int element;
t_float r = -1.f;
if ( (element = find_item(s->s_name,x->names, x->maxentries))+1 ) {
freebytes(x->names[element], sizeof(char) * MAXKEYLEN);
x->names[element]=0;
r = 0.f;
x->entries--;
} else post("index :: couldn't find element");
outlet_float(x->x_obj.ob_outlet, r);
}
static void index_reset(t_index *x)
{
int i=x->maxentries;
while (i--)
if (x->names[i]) {
freebytes(x->names[i], sizeof(char) * MAXKEYLEN);
x->names[i]=0;
}
x->entries=0;
outlet_float(x->x_obj.ob_outlet, 0.f);
}
static void index_symbol(t_index *x, t_symbol *s)
{
int element;
if ( (element = find_item(s->s_name, x->names, x->maxentries)+1) )
outlet_float(x->x_obj.ob_outlet, (t_float)element);
else if (x->auto_mode)
index_add(x, s);
else outlet_float(x->x_obj.ob_outlet, 0.f);
}
static void *index_new(t_symbol *s, int argc, t_atom *argv)
{
t_index *x = (t_index *)pd_new(index_class);
char** buf;
int maxentries = 0, automod=0;
int i;
if (argc--) {
maxentries = (int)atom_getfloat(argv++);
if (argc) automod = (int)atom_getfloat(argv++);
}
if (!maxentries) maxentries=128;
buf = (char **)getbytes(sizeof(char *) * maxentries);
i = maxentries;
while (i--) buf[i]=0;
x->entries = 0;
x->maxentries = maxentries;
x->names = buf;
x->auto_mode = !(!automod);
outlet_new(&x->x_obj, &s_float);
return (x);
}
static void index_free(t_index *x)
{
index_reset(x);
freebytes(x->names, sizeof(char *) * x->maxentries);
}
static void helper(t_index *x)
{
post("\n%c index :: index symbols to indices", HEARTSYMBOL);
post("<symbol>\t : look up the <symbol> in the index and return it's index\n"
"'add <symbol>'\t: add a new symbol to the index\n"
"'delete <symbol>' : delete a symbol from the index\n"
"'reset'\t\t : delete the whole index\n"
"'auto <1/0>\t : if auto is 1 and a yet unknown symbol is looked up it is\n\t\t\t automatically added to the index\n"
"'help'\t\t : view this"
"\noutlet : <n>\t : index of the <symbol>");
post("\ncreation:\"index [<maxelements> [<auto>]]\": creates a <maxelements> sized index");
}
void z_index_setup(void)
{
index_class = class_new(gensym("index"),
(t_newmethod)index_new, (t_method)index_free,
sizeof(t_index), 0, A_GIMME, 0);
class_addsymbol(index_class, index_symbol);
class_addmethod(index_class, (t_method)index_reset, gensym("reset"), 0);
class_addmethod(index_class, (t_method)index_delete, gensym("delete"), A_SYMBOL, 0);
class_addmethod(index_class, (t_method)index_add, gensym("add"), A_SYMBOL, 0);
class_addmethod(index_class, (t_method)index_auto, gensym("auto"), A_FLOAT, 0);
class_addfloat(index_class, (t_method)index_float);
class_addmethod(index_class, (t_method)helper, gensym("help"), 0);
class_sethelpsymbol(index_class, gensym("zexy/index"));
}
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