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/* Copyright (c) 1997-2003 Miller Puckette, krzYszcz, and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* this is merely an abstraction layer over gensym() from m_class.c
with various additions adapted from m_pd.c */
#include <stdio.h>
#include <string.h>
#include "m_pd.h"
#include "common/dict.h"
#define DICT_VERBOSE
//#define DICT_DEBUG
#define DICT_HASHSIZE_DEFAULT 1024
#define DICT_HASHSIZE_MIN 8
#define DICT_HASHSIZE_MAX 16384
/* two structures local to m_pd.c */
typedef struct _dict_bindelem
{
t_pd *e_who;
struct _dict_bindelem *e_next;
} t_dict_bindelem;
typedef struct _dict_bindlist
{
t_pd b_pd;
t_dict_bindelem *b_list;
} t_dict_bindlist;
/* adapted bindlist_anything() from m_pd.c */
static void dict_bindlist_anything(t_dict_bindlist *x, t_symbol *s,
int argc, t_atom *argv)
{
t_dict_bindelem *e;
for (e = x->b_list; e; e = e->e_next)
pd_typedmess(e->e_who, s, argc, argv);
}
/* adapted m_pd_setup() from m_pd.c */
static void dict_bindlist_setup(t_dict *x)
{
x->d_bindlist_class = class_new(dict_key(x, "bindlist"), 0, 0,
sizeof(t_dict_bindlist), CLASS_PD, 0);
class_addanything(x->d_bindlist_class, dict_bindlist_anything);
}
t_dict *dict_new(size_t hashsize)
{
t_dict *x = getbytes(sizeof(*x));
size_t sz;
if (x)
{
if (!hashsize)
sz = DICT_HASHSIZE_DEFAULT;
else if (hashsize >= DICT_HASHSIZE_MAX)
sz = DICT_HASHSIZE_MAX;
else if (hashsize <= DICT_HASHSIZE_MIN)
sz = DICT_HASHSIZE_MIN;
else for (sz = DICT_HASHSIZE_MAX; sz > DICT_HASHSIZE_MIN; sz >>= 1)
if (sz <= hashsize) break;
#ifdef DICT_DEBUG
post("allocating dictionary with %d-element hashtable", sz);
#endif
if (x->d_hashtable =
getbytes((x->d_hashsize = sz) * sizeof(*x->d_hashtable)))
{
dict_bindlist_setup(x);
return (x);
}
freebytes(x, sizeof(*x));
}
return (0);
}
void dict_free(t_dict *x)
{
if (x->d_hashtable)
freebytes(x->d_hashtable, x->d_hashsize * sizeof(*x->d_hashtable));
freebytes(x, sizeof(*x));
}
/* adapted dogensym() from m_class.c */
t_symbol *dict_dokey(t_dict *x, char *s, t_symbol *oldsym)
{
t_symbol **sym1, *sym2;
unsigned int hash1 = 0, hash2 = 0;
int length = 0;
char *s2 = s;
int mask = x->d_hashsize - 1;
#ifdef DICT_DEBUG
startpost("make symbol-key from \"%s\"", s);
#endif
while (*s2)
{
hash1 += *s2;
hash2 += hash1;
length++;
s2++;
}
sym1 = x->d_hashtable + (hash2 & mask);
#ifdef DICT_DEBUG
post(" in slot %d", (hash2 & mask));
#endif
while (sym2 = *sym1)
{
#ifdef DICT_DEBUG
post("try \"%s\"", sym2->s_name);
#endif
if (!strcmp(sym2->s_name, s))
{
#ifdef DICT_DEBUG
post("found at address %x", (int)sym2);
#endif
return(sym2);
}
sym1 = &sym2->s_next;
}
if (oldsym) sym2 = oldsym;
else
{
sym2 = (t_symbol *)t_getbytes(sizeof(*sym2));
sym2->s_name = t_getbytes(length+1);
sym2->s_next = 0;
sym2->s_thing = 0;
strcpy(sym2->s_name, s);
}
*sym1 = sym2;
#ifdef DICT_DEBUG
post("appended at address %x", (int)sym2);
#endif
return (sym2);
}
/* adapted gensym() from m_class.c */
t_symbol *dict_key(t_dict *x, char *s)
{
return (dict_dokey(x, s, 0));
}
/* adapted pd_bind() from m_pd.c */
void dict_bind(t_dict *x, t_pd *obj, t_symbol *s)
{
#ifdef DICT_DEBUG
post("bind %x to \"%s\" at %x", (int)obj, s->s_name, (int)s);
#endif
if (s->s_thing)
{
#ifdef DICT_DEBUG
post("(next one)");
#endif
if (*s->s_thing == x->d_bindlist_class)
{
t_dict_bindlist *b = (t_dict_bindlist *)s->s_thing;
t_dict_bindelem *e =
(t_dict_bindelem *)getbytes(sizeof(t_dict_bindelem));
e->e_next = b->b_list;
e->e_who = obj;
b->b_list = e;
}
else
{
t_dict_bindlist *b =
(t_dict_bindlist *)pd_new(x->d_bindlist_class);
t_dict_bindelem *e1 =
(t_dict_bindelem *)getbytes(sizeof(t_dict_bindelem));
t_dict_bindelem *e2 =
(t_dict_bindelem *)getbytes(sizeof(t_dict_bindelem));
b->b_list = e1;
e1->e_who = obj;
e1->e_next = e2;
e2->e_who = s->s_thing;
e2->e_next = 0;
s->s_thing = &b->b_pd;
}
}
else s->s_thing = obj;
}
/* adapted pd_unbind() from m_pd.c */
void dict_unbind(t_dict *x, t_pd *obj, t_symbol *s)
{
#ifdef DICT_DEBUG
post("unbind %x from \"%s\" at %x", (int)obj, s->s_name, (int)s);
#endif
if (s->s_thing == obj) s->s_thing = 0;
else if (s->s_thing && *s->s_thing == x->d_bindlist_class)
{
/* bindlists always have at least two elements... if the number
goes down to one, get rid of the bindlist and bind the symbol
straight to the remaining element. */
t_dict_bindlist *b = (t_dict_bindlist *)s->s_thing;
t_dict_bindelem *e, *e2;
if ((e = b->b_list)->e_who == obj)
{
b->b_list = e->e_next;
freebytes(e, sizeof(t_dict_bindelem));
}
else for (e = b->b_list; e2 = e->e_next; e = e2)
if (e2->e_who == obj)
{
e->e_next = e2->e_next;
freebytes(e2, sizeof(t_dict_bindelem));
break;
}
if (!b->b_list->e_next)
{
s->s_thing = b->b_list->e_who;
freebytes(b->b_list, sizeof(t_dict_bindelem));
pd_free(&b->b_pd);
}
}
else pd_error(obj, "%s: couldn't unbind", s->s_name);
}
/* adapted pd_findbyclass() from m_pd.c */
t_pd *dict_value(t_dict *x, t_symbol *s)
{
if (!s->s_thing) return (0);
if (*s->s_thing == x->d_bindlist_class)
{
t_pd *x = 0;
t_dict_bindelem *e;
int warned = 0;
for (e = ((t_dict_bindlist *)s->s_thing)->b_list; e; e = e->e_next)
{
if (x && !warned)
{
post("warning: %s: multiply defined", s->s_name);
warned = 1;
}
x = e->e_who;
}
return (x);
}
return (s->s_thing);
}
t_pd *dict_xvalue(t_dict *x, t_symbol *s)
{
return (s && s != &s_ ? dict_value(x, dict_key(x, s->s_name)) : 0);
}
int dict_forall(t_dict *x, t_symbol *s, t_dict_hook hook, void *hookarg)
{
if (!s->s_thing)
return (0);
if (*s->s_thing == x->d_bindlist_class)
{
t_dict_bindelem *e = ((t_dict_bindlist *)s->s_thing)->b_list;
if (!e)
return (0);
if (!hook)
return (1);
do
if (!hook(e->e_who, hookarg))
return (0);
while (e = e->e_next);
return (1);
}
return (hook ? hook(s->s_thing, hookarg) : 1);
}
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