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#include <string.h>
#include <stdlib.h>
#include <algds/tree_map.h>
#include <algds/basic_traits.h>
#include <bamboo_lisp/interp.h>
#include <bamboo_lisp/sexp.h>
TREE_MAP_DEF(String, SExpRef);
TREE_MAP_IMPL(String, SExpRef);
typedef String2SExpRefTreeMap DictMap;
typedef String2SExpRefTreeMapIter DictIter;
typedef String2SExpRefTreeMapNode DictNode;
LispUserdataMeta bamboo_lisp_dict_meta;
#define DICT_TYPEID "ext.core.dict"
static bool is_dict_impl(Interp *interp, SExpRef obj) {
if (VALTYPE(obj) == kUserDataSExp && strcmp(DICT_TYPEID, REF(obj)->userdata_meta->type) == 0) {
return true;
}
return false;
}
static void dict_free(void *vself) {
DictMap *map = (DictMap *)vself;
DictIter it = String2SExpRefTreeMap_min(map);
while (it != NULL) {
if (it->key) {
free((void*)it->key);
it->key = NULL;
}
it = String2SExpRefTreeMap_next(map, it);
}
String2SExpRefTreeMap_free(map);
free(map);
}
static void dict_gcmark(Interp *interp, SExpPtrVector *gcstack, void *vself) {
DictMap *map = (DictMap *)vself;
DictIter it = String2SExpRefTreeMap_min(map);
while (it != NULL) {
SExpRef val = it->value;
SExpPtr ptr = REF(val);
if (ptr && !ptr->marked) {
SExpPtrVector_push_back(gcstack, ptr);
}
it = String2SExpRefTreeMap_next(map, it);
}
}
static SExpRef lisp_is_dict(Interp* interp, SExpRef args) {
if (LENGTH(args) != 1) return new_error(interp, "dict?: wrongs args num.\n");
return new_boolean(interp, is_dict_impl(interp, CAR(args)));
}
// (make-dict)
static SExpRef lisp_make_dict(Interp* interp, SExpRef args) {
if (LENGTH(args) != 0) return new_error(interp, "make-dict: expects no args.\n");
SExpRef ret = new_sexp(interp);
REF(ret)->type = kUserDataSExp;
REF(ret)->userdata_meta = &bamboo_lisp_dict_meta;
DictMap *map = malloc(sizeof(DictMap));
if (!map) return new_error(interp, "make-dict: out of memory.\n");
String2SExpRefTreeMap_init(map);
REF(ret)->userdata = map;
return ret;
}
// (dict-set dict key value)
static SExpRef lisp_dict_set(Interp* interp, SExpRef args) {
if (LENGTH(args) != 3) return new_error(interp, "dict-set: wrong args num.\n");
SExpRef r_dict = CAR(args);
SExpRef r_key = CADR(args);
SExpRef r_val = CADDR(args);
if (!is_dict_impl(interp, r_dict)) return new_error(interp, "dict-set: first arg not a dict.\n");
if (REF(r_key)->type != kStringSExp) return new_error(interp, "dict-set: key must be a string.\n");
DictMap *map = REF(r_dict)->userdata;
const char *key_str = REF(r_key)->str;
DictIter it = String2SExpRefTreeMap_find(map, key_str);
if (it != NULL) {
it->value = r_val;
} else {
char *key_dup = strdup(key_str);
String2SExpRefTreeMap_insert(map, key_dup, r_val);
}
return NIL;
}
// (dict-get dict key) -> value or nil
static SExpRef lisp_dict_get(Interp* interp, SExpRef args) {
if (LENGTH(args) != 2) return new_error(interp, "dict-get: wrong args num.\n");
SExpRef r_dict = CAR(args);
SExpRef r_key = CADR(args);
if (!is_dict_impl(interp, r_dict)) return new_error(interp, "dict-get: first arg not a dict.\n");
if (REF(r_key)->type != kStringSExp) return new_error(interp, "dict-get: key must be a string.\n");
DictMap *map = REF(r_dict)->userdata;
const char *key_str = REF(r_key)->str;
SExpRef *val_ptr = String2SExpRefTreeMap_get(map, key_str);
if (val_ptr == NULL) {
return NIL;
}
return *val_ptr;
}
// (dict-remove dict key)
static SExpRef lisp_dict_remove(Interp* interp, SExpRef args) {
if (LENGTH(args) != 2) return new_error(interp, "dict-remove: wrong args num.\n");
SExpRef r_dict = CAR(args);
SExpRef r_key = CADR(args);
if (!is_dict_impl(interp, r_dict)) return new_error(interp, "dict-remove: first arg not a dict.\n");
if (REF(r_key)->type != kStringSExp) return new_error(interp, "dict-remove: key must be a string.\n");
DictMap *map = REF(r_dict)->userdata;
const char *key_str = REF(r_key)->str;
DictIter it = String2SExpRefTreeMap_find(map, key_str);
if (it != NULL) {
const char *owned_key = it->key;
String2SExpRefTreeMap_remove(map, it);
if (owned_key) free((void*)owned_key);
free(it);
}
return NIL;
}
int bamboo_lisp_dict_ext_init(Interp *interp) {
bamboo_lisp_dict_meta.type = DICT_TYPEID;
bamboo_lisp_dict_meta.free = &dict_free;
bamboo_lisp_dict_meta.gcmark = &dict_gcmark;
Interp_add_userfunc(interp, "dict?", &lisp_is_dict);
Interp_add_userfunc(interp, "make-dict", &lisp_make_dict);
Interp_add_userfunc(interp, "dict-get", &lisp_dict_get);
Interp_add_userfunc(interp, "dict-set", &lisp_dict_set);
Interp_add_userfunc(interp, "dict-remove", &lisp_dict_remove);
// TODO dict-keys
return 1;
}
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