shithub: sl

ref: a70379d7e4b822f532fb0a8ccdd1624a90b64a68
dir: /src/table.c/

#include "sl.h"
#include "equalhash.h"
#include "cvalues.h"
#include "types.h"
#include "print.h"
#include "table.h"

#define inline_space sizeof(((sl_htable*)nil)->_space)

static sl_type *sl_tabletype;

static void
print_htable(sl_v v, sl_ios *f)
{
	sl_htable *h = cvalue_data(v);
	int first = 1;
	sl_print_str(f, "#table(");
	for(int i = 0; i < h->size; i += 2){
		if(h->table[i+1] != HT_NOTFOUND){
			if(!first)
				sl_print_str(f, "  ");
			sl_print_child(f, (sl_v)h->table[i]);
			sl_print_chr(f, ' ');
			sl_print_child(f, (sl_v)h->table[i+1]);
			first = 0;
		}
	}
	sl_print_chr(f, ')');
}

static void
print_traverse_htable(sl_v self)
{
	sl_htable *h = cvalue_data(self);
	for(int i = 0; i < h->size; i += 2){
		if(h->table[i+1] != HT_NOTFOUND){
			print_traverse((sl_v)h->table[i]);
			print_traverse((sl_v)h->table[i+1]);
		}
	}
}

static void
free_htable(sl_v self)
{
	sl_htable *h = cvalue_data(self);
	htable_free(h);
}

static void
relocate_htable(sl_v oldv, sl_v newv)
{
	sl_htable *oldh = cvalue_data(oldv);
	sl_htable *h = cvalue_data(newv);
	if(oldh->table == &oldh->_space[0])
		h->table = &h->_space[0];
	h->i = oldh->i;
	for(int i = 0; i < h->size; i++){
		if(h->table[i] != HT_NOTFOUND)
			h->table[i] = (void*)sl_relocate((sl_v)h->table[i]);
	}
}

static sl_cvtable table_vtable = {
	print_htable,
	relocate_htable,
	free_htable,
	print_traverse_htable,
};

bool
ishashtable(sl_v v)
{
	return iscvalue(v) && cv_class(ptr(v)) == sl_tabletype;
}

sl_purefn
BUILTIN("table?", tablep)
{
	argcount(nargs, 1);
	return ishashtable(args[0]) ? sl_t : sl_nil;
}

sl_htable *
totable(sl_v v)
{
	if(!ishashtable(v))
		type_error("table", v);
	return cvalue_data(v);
}

BUILTIN("table", table)
{
	int cnt = nargs;
	if(cnt & 1)
		lerrorf(sl_errarg, "arguments must come in pairs");
	sl_v nt;
	// prevent small tables from being added to finalizer list
	if(cnt <= HT_N_INLINE)
		nt = cvalue_nofinalizer(sl_tabletype, sizeof(sl_htable));
	else
		nt = cvalue(sl_tabletype, sizeof(sl_htable)-inline_space);
	sl_htable *h = cvalue_data(nt);
	htable_new(h, cnt/2);
	sl_v k = sl_nil, arg;
	int i;
	FOR_ARGS(i, 0, arg, args){
		if(i & 1)
			equalhash_put(h, (void*)k, (void*)arg);
		else
			k = arg;
	}
	assert(h->table == &h->_space[0] || cnt > HT_N_INLINE);
	return nt;
}

// (put! table key value)
BUILTIN("put!", put)
{
	argcount(nargs, 3);
	sl_htable *h = totable(args[0]);
	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]){
		sl_cv *cv = ptr(args[0]);
		add_finalizer(cv);
		cv->len = sizeof(sl_htable) - inline_space;
	}
	return args[0];
}

_Noreturn
static void
key_error(sl_v key)
{
	lerrorf(mk_list2(sl_errkey, key), "key not found");
}

// (get table key [default])
sl_purefn
BUILTIN("get", get)
{
	if(nargs != 3)
		argcount(nargs, 2);
	sl_htable *h = totable(args[0]);
	sl_v v = (sl_v)equalhash_get(h, (void*)args[1]);
	if(v == (sl_v)HT_NOTFOUND){
		if(nargs == 3)
			return args[2];
		key_error(args[1]);
	}
	return v;
}

// (has? table key)
sl_purefn
BUILTIN("has?", has)
{
	argcount(nargs, 2);
	sl_htable *h = totable(args[0]);
	return equalhash_has(h, (void*)args[1]) ? sl_t : sl_nil;
}

// (del! table key)
BUILTIN("del!", del)
{
	argcount(nargs, 2);
	sl_htable *h = totable(args[0]);
	if(!equalhash_remove(h, (void*)args[1]))
		key_error(args[1]);
	return args[0];
}

BUILTIN("table-foldl", table_foldl)
{
	argcount(nargs, 3);
	sl_v f = args[0], zero = args[1], t = args[2];
	sl_htable *h = totable(t);
	int n = h->size;
	void **table = h->table;
	sl_gc_handle(&f);
	sl_gc_handle(&zero);
	sl_gc_handle(&t);
	for(int i = 0; i < n; i += 2){
		if(table[i+1] == HT_NOTFOUND)
			continue;
		zero = sl_applyn(3, f, (sl_v)table[i], (sl_v)table[i+1], zero);
		// reload pointer
		h = cvalue_data(t);
		n = h->size;
		table = h->table;
	}
	sl_free_gc_handles(3);
	return zero;
}

void
table_init(void)
{
	sl_tabletype = define_opaque_type(mk_sym("table", false), sizeof(sl_htable), &table_vtable, nil);
}