ref: 32172cdf6a00026675dee9be5c0fa3aef5fdff9d
dir: femtolisp/table.c
#ifdef __plan9__
#include <u.h>
#include <libc.h>
#else
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>
#include <sys/types.h>
#include <setjmp.h>
#endif
#include "llt.h"
#include "flisp.h"
#include "equalhash.h"
static value_t tablesym;
static fltype_t *tabletype;
void print_htable(value_t v, ios_t *f)
{
htable_t *h = (htable_t*)cv_data((cvalue_t*)ptr(v));
size_t i;
int first=1;
fl_print_str("#table(", f);
for(i=0; i < h->size; i+=2) {
if (h->table[i+1] != HT_NOTFOUND) {
if (!first) fl_print_str(" ", f);
fl_print_child(f, (value_t)h->table[i]);
fl_print_chr(' ', f);
fl_print_child(f, (value_t)h->table[i+1]);
first = 0;
}
}
fl_print_chr(')', f);
}
void print_traverse_htable(value_t self)
{
htable_t *h = (htable_t*)cv_data((cvalue_t*)ptr(self));
size_t i;
for(i=0; i < h->size; i+=2) {
if (h->table[i+1] != HT_NOTFOUND) {
print_traverse((value_t)h->table[i]);
print_traverse((value_t)h->table[i+1]);
}
}
}
void free_htable(value_t self)
{
htable_t *h = (htable_t*)cv_data((cvalue_t*)ptr(self));
htable_free(h);
}
void relocate_htable(value_t oldv, value_t newv)
{
htable_t *oldh = (htable_t*)cv_data((cvalue_t*)ptr(oldv));
htable_t *h = (htable_t*)cv_data((cvalue_t*)ptr(newv));
if (oldh->table == &oldh->_space[0])
h->table = &h->_space[0];
size_t i;
for(i=0; i < h->size; i++) {
if (h->table[i] != HT_NOTFOUND)
h->table[i] = (void*)relocate_lispvalue((value_t)h->table[i]);
}
}
cvtable_t table_vtable = { print_htable, relocate_htable, free_htable,
print_traverse_htable };
int ishashtable(value_t v)
{
return iscvalue(v) && cv_class((cvalue_t*)ptr(v)) == tabletype;
}
value_t fl_tablep(value_t *args, uint32_t nargs)
{
argcount("table?", nargs, 1);
return ishashtable(args[0]) ? FL_T : FL_F;
}
static htable_t *totable(value_t v, char *fname)
{
if (!ishashtable(v))
type_error(fname, "table", v);
return (htable_t*)cv_data((cvalue_t*)ptr(v));
}
value_t fl_table(value_t *args, uint32_t nargs)
{
size_t cnt = (size_t)nargs;
if (cnt & 1)
lerror(ArgError, "table: arguments must come in pairs");
value_t nt;
// prevent small tables from being added to finalizer list
if (cnt <= HT_N_INLINE) {
tabletype->vtable->finalize = NULL;
nt = cvalue(tabletype, sizeof(htable_t));
tabletype->vtable->finalize = free_htable;
}
else {
nt = cvalue(tabletype, 2*sizeof(void*));
}
htable_t *h = (htable_t*)cv_data((cvalue_t*)ptr(nt));
htable_new(h, cnt/2);
uint32_t i;
value_t k=FL_NIL, arg;
FOR_ARGS(i,0,arg,args) {
if (i&1)
equalhash_put(h, (void*)k, (void*)arg);
else
k = arg;
}
return nt;
}
// (put! table key value)
value_t fl_table_put(value_t *args, uint32_t nargs)
{
argcount("put!", nargs, 3);
htable_t *h = totable(args[0], "put!");
void **table0 = h->table;
equalhash_put(h, (void*)args[1], (void*)args[2]);
// register finalizer if we outgrew inline space
if (table0 == &h->_space[0] && h->table != &h->_space[0]) {
cvalue_t *cv = (cvalue_t*)ptr(args[0]);
add_finalizer(cv);
cv->len = 2*sizeof(void*);
}
return args[0];
}
static void key_error(char *fname, value_t key)
{
lerrorf(fl_list2(KeyError, key), "%s: key not found", fname);
}
// (get table key [default])
value_t fl_table_get(value_t *args, uint32_t nargs)
{
if (nargs != 3)
argcount("get", nargs, 2);
htable_t *h = totable(args[0], "get");
value_t v = (value_t)equalhash_get(h, (void*)args[1]);
if (v == (value_t)HT_NOTFOUND) {
if (nargs == 3)
return args[2];
key_error("get", args[1]);
}
return v;
}
// (has? table key)
value_t fl_table_has(value_t *args, uint32_t nargs)
{
argcount("has", nargs, 2);
htable_t *h = totable(args[0], "has");
return equalhash_has(h, (void*)args[1]) ? FL_T : FL_F;
}
// (del! table key)
value_t fl_table_del(value_t *args, uint32_t nargs)
{
argcount("del!", nargs, 2);
htable_t *h = totable(args[0], "del!");
if (!equalhash_remove(h, (void*)args[1]))
key_error("del!", args[1]);
return args[0];
}
value_t fl_table_foldl(value_t *args, uint32_t nargs)
{
argcount("table.foldl", nargs, 3);
value_t f=args[0], zero=args[1], t=args[2];
htable_t *h = totable(t, "table.foldl");
size_t i, n = h->size;
void **table = h->table;
fl_gc_handle(&f);
fl_gc_handle(&zero);
fl_gc_handle(&t);
for(i=0; i < n; i+=2) {
if (table[i+1] != HT_NOTFOUND) {
zero = fl_applyn(3, f,
(value_t)table[i],
(value_t)table[i+1],
zero);
// reload pointer
h = (htable_t*)cv_data((cvalue_t*)ptr(t));
if (h->size != n)
lerror(EnumerationError, "table.foldl: table modified");
table = h->table;
}
}
fl_free_gc_handles(3);
return zero;
}
static builtinspec_t tablefunc_info[] = {
{ "table", fl_table },
{ "table?", fl_tablep },
{ "put!", fl_table_put },
{ "get", fl_table_get },
{ "has?", fl_table_has },
{ "del!", fl_table_del },
{ "table.foldl", fl_table_foldl },
{ NULL, NULL }
};
void table_init(void)
{
tablesym = symbol("table");
tabletype = define_opaque_type(tablesym, sizeof(htable_t),
&table_vtable, NULL);
assign_global_builtins(tablefunc_info);
}