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#include "object.h"
#include "ast.h"
#include "hmap.h"
#include "vector.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static const char *object_types[] = {
"error",
"null",
"int",
"bool",
"return",
};
static void
environment_destroy_cb(const void *key, void *val)
{
struct object *obj = val;
object_unref(obj);
}
static inline char *
bool_sprint(bool val, char *str)
{
sprintf(str, val ? "true" : "false");
return str;
}
extern inline const char *
object_type_print(enum object_type type)
{
return object_types[type];
}
static inline char *
object_func_sprint(struct object *obj, char *str)
{
char *cur = str;
sprintf(cur, "fn(");
cur += strlen(cur);
size_t i;
struct expression *ident;
vector_foreach(obj->func.params, i, ident) {
node_sprint(ident, cur);
cur += strlen(cur);
if (i < (obj->func.params->len - 1)) {
cur[0] = ',', cur[1] = ' ', cur += 2;
}
}
sprintf(cur, ") {\n");
cur += strlen(cur);
node_sprint(obj->func.body, cur);
cur += strlen(cur);
sprintf(cur, "\n}");
return str;
}
char *
object_sprint(struct object *obj, char *str)
{
switch (obj->type) {
case OBJECT_NULL:
sprintf(str, "null");
break;
case OBJECT_BOOL:
return bool_sprint(obj->boolean, str);
case OBJECT_INT:
sprintf(str, "%ld", obj->integer);
break;
case OBJECT_RETURN:
object_sprint(obj->retrn.value, str);
case OBJECT_ERROR:
strcpy(str, obj->error.msg);
case OBJECT_FUNC:
return object_func_sprint(obj, str);
}
return str;
}
struct object *
object_new_int(int64_t val)
{
struct object *obj = malloc(sizeof(*obj));
obj->type = OBJECT_INT;
obj->refcount = 1;
obj->integer = val;
return obj;
}
struct object *
object_new_error(char *msg)
{
struct object *obj = malloc(sizeof(*obj));
obj->type = OBJECT_ERROR;
obj->refcount = 1;
obj->error.msg = msg;
return obj;
}
struct object *
object_new_return(struct object *val)
{
struct object *obj = malloc(sizeof(*obj));
obj->type = OBJECT_RETURN;
obj->refcount = 1;
obj->retrn.value = val;
return obj;
}
struct object *
object_new_func(struct expression *expr)
{
struct object *obj = malloc(sizeof(*obj));
obj->type = OBJECT_FUNC;
obj->refcount = 1;
obj->func.body = node_dup(expr->func.body);
obj->func.params = expression_vector_dup(expr->func.parameters);
return obj;
}
void
object_ref(struct object *obj)
{
obj->refcount++;
}
void
object_unref(struct object *obj)
{
if (obj->type == OBJECT_NULL || obj->type == OBJECT_BOOL) return;
if (--obj->refcount < 1) {
switch (obj->type) {
case OBJECT_RETURN:
object_unref(obj->retrn.value);
break;
case OBJECT_ERROR:
free(obj->error.msg);
break;
case OBJECT_FUNC:
node_destroy(obj->func.body);
size_t i;
struct expression *param;
vector_foreach(obj->func.params, i, param) {
node_destroy(param);
}
vector_free(obj->func.params);
break;
default:
break;
}
free(obj);
}
}
struct environment *
environment_new_enclosed(struct environment *outer)
{
struct environment *env = malloc(sizeof(*env));
env->store = hmap_new();
if (!env->store) {
free(env);
return NULL;
}
env->outer = outer;
return env;
}
struct object *
environment_set(struct environment *env, struct slice key, struct object *val)
{
object_ref(val);
return hmap_sets(env->store, key, val);
}
struct object *
environment_get(struct environment *env, const struct slice *key)
{
struct object *obj = hmap_gets(env->store, key);
if (!obj && env->outer) {
obj = environment_get(env->outer, key);
}
return obj;
}
void
environment_destroy(struct environment *env)
{
hmap_destroy(env->store, environment_destroy_cb);
free(env);
}
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