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javascript for 🐜's, a tiny runtime with big ambitions antjs.org
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350#include <string.h>#include <stdlib.h>
#include <uthash.h>
#include "ant.h"#include "errors.h"#include "runtime.h"#include "internal.h"#include "descriptors.h"
#include "modules/date.h"#include "modules/buffer.h"#include "modules/collections.h"#include "modules/domexception.h"#include "modules/blob.h"#include "modules/structured-clone.h"
typedef struct sc_entry { ant_value_t key; ant_value_t value; UT_hash_handle hh;} sc_entry_t;
static void sc_add(sc_entry_t **table, ant_value_t key, ant_value_t value) { sc_entry_t *e = calloc(1, sizeof(sc_entry_t)); if (!e) return; e->key = key; e->value = value; HASH_ADD(hh, *table, key, sizeof(ant_value_t), e);}
static ant_value_t sc_lookup(sc_entry_t **table, ant_value_t key) { sc_entry_t *e; HASH_FIND(hh, *table, &key, sizeof(ant_value_t), e); return e ? e->value : js_mkundef();}
static bool sc_has(sc_entry_t **table, ant_value_t key) { sc_entry_t *e; HASH_FIND(hh, *table, &key, sizeof(ant_value_t), e); return e != NULL;}
static void sc_free(sc_entry_t **table) { sc_entry_t *e, *tmp; HASH_ITER(hh, *table, e, tmp) { HASH_DEL(*table, e); free(e); }}
static ant_value_t sc_clone_typed_array( ant_t *js, ant_value_t key, TypedArrayData *ta_data, sc_entry_t **seen) { ant_value_t existing = sc_lookup(seen, key); if (vtype(existing) != T_UNDEF) return existing; if (!ta_data || !ta_data->buffer) return js_throw( js, make_dom_exception(js, "TypedArray could not be cloned", "DataCloneError") );
ArrayBufferData *new_buf = create_array_buffer_data(ta_data->byte_length); if (!new_buf) return js_mkerr(js, "out of memory"); if (ta_data->byte_length > 0) { memcpy(new_buf->data, ta_data->buffer->data + ta_data->byte_offset, ta_data->byte_length); }
ant_value_t clone = create_typed_array( js, ta_data->type, new_buf, 0, ta_data->length, buffer_typedarray_type_name(ta_data->type) ); sc_add(seen, key, clone); return clone;}
static ant_value_t sc_clone_rec(ant_t *js, ant_value_t val, sc_entry_t **seen, sc_entry_t **transfer) { uint8_t t = vtype(val); TypedArrayData *ta_data = NULL;
if (t == T_UNDEF || t == T_NULL || t == T_BOOL || t == T_NUM || t == T_BIGINT || t == T_STR) return val; if (t == T_SYMBOL) return js_throw(js, make_dom_exception(js, "Symbol cannot be serialized", "DataCloneError"));
if (is_object_type(val)) { ta_data = buffer_get_typedarray_data(val); }
if (ta_data) { return sc_clone_typed_array(js, val, ta_data, seen); }
if (t == T_TYPEDARRAY) { return sc_clone_typed_array(js, val, (TypedArrayData *)js_gettypedarray(val), seen); }
if (t == T_FUNC || t == T_CFUNC) return js_throw(js, make_dom_exception(js, "() => {} could not be cloned", "DataCloneError")); if (t == T_PROMISE || t == T_GENERATOR) return js_throw(js, make_dom_exception(js, "Value could not be cloned", "DataCloneError")); if (!is_object_type(val)) return js_throw(js, make_dom_exception(js, "Value could not be cloned", "DataCloneError"));
ant_value_t existing = sc_lookup(seen, val); if (vtype(existing) != T_UNDEF) return existing;
ArrayBufferData *abd = buffer_get_arraybuffer_data(val); if (abd) { if (abd && !abd->is_detached) { if (transfer && sc_has(transfer, val)) { ArrayBufferData *new_abd = calloc(1, sizeof(ArrayBufferData)); if (!new_abd) return js_mkerr(js, "out of memory"); new_abd->data = abd->data; new_abd->length = abd->length; new_abd->capacity = abd->capacity; new_abd->ref_count = 1; abd->data = NULL; abd->length = 0; abd->capacity = 0; abd->is_detached = 1; js_set(js, val, "byteLength", js_mknum(0)); ant_value_t clone = create_arraybuffer_obj(js, new_abd); sc_add(seen, val, clone); return clone; } ArrayBufferData *new_abd = create_array_buffer_data(abd->length); if (!new_abd) return js_mkerr(js, "out of memory"); if (abd->length > 0) memcpy(new_abd->data, abd->data, abd->length); ant_value_t clone = create_arraybuffer_obj(js, new_abd); sc_add(seen, val, clone); return clone; }}
if (buffer_is_dataview(val)) { DataViewData *dv = buffer_get_dataview_data(val); if (!dv || !dv->buffer) return js_throw(js, make_dom_exception(js, "DataView could not be cloned", "DataCloneError")); ArrayBufferData *new_buf = create_array_buffer_data(dv->buffer->length); if (!new_buf) return js_mkerr(js, "out of memory"); if (dv->buffer->length > 0) memcpy(new_buf->data, dv->buffer->data, dv->buffer->length);
ant_value_t ab_obj = create_arraybuffer_obj(js, new_buf); ant_value_t clone = create_dataview_with_buffer( js, new_buf, dv->byte_offset, dv->byte_length, ab_obj ); if (is_err(clone)) { free_array_buffer_data(new_buf); return clone; }
js_set(js, clone, "byteOffset", js_mknum((double)dv->byte_offset)); js_set(js, clone, "byteLength", js_mknum((double)dv->byte_length)); sc_add(seen, val, clone); free_array_buffer_data(new_buf); return clone; }
if (t == T_ARR) { ant_value_t clone = js_mkarr(js); sc_add(seen, val, clone); ant_offset_t len = js_arr_len(js, val); for (ant_offset_t i = 0; i < len; i++) { ant_value_t ic = sc_clone_rec(js, js_arr_get(js, val, i), seen, transfer); if (is_err(ic)) return ic; js_arr_push(js, clone, ic); } return clone; }
ant_object_t *obj_ptr = js_obj_ptr(val); if (!obj_ptr) return js_throw(js, make_dom_exception(js, "Value could not be cloned", "DataCloneError"));
if (obj_ptr->type_tag == T_WEAKMAP || obj_ptr->type_tag == T_WEAKSET) return js_throw(js, make_dom_exception(js, "WeakMap/WeakSet could not be cloned", "DataCloneError"));
if (obj_ptr->type_tag == T_MAP) { ant_value_t clone = js_mkobj(js); js_obj_ptr(clone)->type_tag = T_MAP;
ant_value_t map_proto = js_get_ctor_proto(js, "Map", 3); if (is_special_object(map_proto)) js_set_proto_init(clone, map_proto); map_entry_t **new_head = ant_calloc(sizeof(map_entry_t *)); if (!new_head) return js_mkerr(js, "out of memory"); *new_head = NULL; js_set_slot(clone, SLOT_DATA, ANT_PTR(new_head)); sc_add(seen, val, clone); map_entry_t **src_head = get_map_from_obj(val); if (src_head && *src_head) { map_entry_t *e, *tmp; HASH_ITER(hh, *src_head, e, tmp) { ant_value_t vc = sc_clone_rec(js, e->value, seen, transfer); if (is_err(vc)) return vc; map_entry_t *ne = ant_calloc(sizeof(map_entry_t)); if (!ne) return js_mkerr(js, "out of memory"); ne->key = (unsigned char *)strdup((const char *)e->key); ne->key_val = e->key_val; ne->value = vc; HASH_ADD_KEYPTR( hh, *new_head, ne->key, (unsigned)strlen((const char *)ne->key), ne ); }} return clone; }
if (obj_ptr->type_tag == T_SET) { ant_value_t clone = js_mkobj(js); js_obj_ptr(clone)->type_tag = T_SET; ant_value_t set_proto = js_get_ctor_proto(js, "Set", 3); if (is_special_object(set_proto)) js_set_proto_init(clone, set_proto); set_entry_t **new_head = ant_calloc(sizeof(set_entry_t *)); if (!new_head) return js_mkerr(js, "out of memory"); *new_head = NULL; js_set_slot(clone, SLOT_DATA, ANT_PTR(new_head)); sc_add(seen, val, clone);
set_entry_t **src_head = get_set_from_obj(val); if (src_head && *src_head) { set_entry_t *e, *tmp; HASH_ITER(hh, *src_head, e, tmp) { ant_value_t vc = sc_clone_rec(js, e->value, seen, transfer); if (is_err(vc)) return vc;
set_entry_t *ne = ant_calloc(sizeof(set_entry_t)); if (!ne) return js_mkerr(js, "out of memory"); ne->key = (unsigned char *)strdup((const char *)e->key); ne->value = vc; HASH_ADD_KEYPTR( hh, *new_head, ne->key, (unsigned)strlen((const char *)ne->key), ne ); }}
return clone; }
if (js_get_slot(val, SLOT_ERROR_BRAND) == js_true) { ant_value_t clone = js_mkobj(js); sc_add(seen, val, clone);
const char *msg = get_str_prop(js, val, "message", 7, NULL); const char *name = get_str_prop(js, val, "name", 4, NULL); const char *stack = get_str_prop(js, val, "stack", 5, NULL);
if (msg) js_set(js, clone, "message", js_mkstr(js, msg, strlen(msg))); if (name) js_set(js, clone, "name", js_mkstr(js, name, strlen(name))); if (stack) js_set(js, clone, "stack", js_mkstr(js, stack, strlen(stack))); js_set_slot(clone, SLOT_ERROR_BRAND, js_true);
ant_value_t err_type = js_get_slot(val, SLOT_ERR_TYPE); if (vtype(err_type) != T_UNDEF) js_set_slot(clone, SLOT_ERR_TYPE, err_type);
return clone; }
if (is_date_instance(val)) { ant_value_t clone = js_mkobj(js); ant_value_t date_proto = js_get_ctor_proto(js, "Date", 4); if (is_object_type(date_proto)) js_set_proto_init(clone, date_proto); js_set_slot(clone, SLOT_DATA, js_get_slot(val, SLOT_DATA)); js_set_slot(clone, SLOT_BRAND, js_mknum(BRAND_DATE)); sc_add(seen, val, clone);
return clone; }
blob_data_t *bd = js_is_prototype_of(js, g_blob_proto, val) ? blob_get_data(val) : NULL; if (bd) { ant_value_t clone = blob_create(js, bd->data, bd->size, bd->type); if (is_err(clone)) return clone; sc_add(seen, val, clone); if (bd->name) { blob_data_t *nbd = blob_get_data(clone); if (nbd) { nbd->name = strdup(bd->name); nbd->last_modified = bd->last_modified; } js_set_proto_init(clone, g_file_proto); } return clone; }
ant_value_t clone = js_mkobj(js); sc_add(seen, val, clone);
ant_iter_t iter = js_prop_iter_begin(js, val); const char *key; size_t key_len; ant_value_t pval;
while (js_prop_iter_next(&iter, &key, &key_len, &pval)) { ant_value_t pc = sc_clone_rec(js, pval, seen, transfer); if (is_err(pc)) { js_prop_iter_end(&iter); return pc; } js_set(js, clone, key, pc); }
js_prop_iter_end(&iter); return clone;}
ant_value_t js_structured_clone(ant_t *js, ant_value_t *args, int nargs) { if (nargs < 1) return js_mkundef();
sc_entry_t *transfer = NULL;
if (nargs < 2 || !is_object_type(args[1])) goto clone; ant_value_t xfer_arr = js_get(js, args[1], "transfer"); if (vtype(xfer_arr) != T_ARR) goto clone;
ant_offset_t xfer_len = js_arr_len(js, xfer_arr); for (ant_offset_t i = 0; i < xfer_len; i++) { ant_value_t item = js_arr_get(js, xfer_arr, i); if (is_object_type(item)) sc_add(&transfer, item, js_true); }
clone:;
sc_entry_t *seen = NULL; ant_value_t result = sc_clone_rec(js, args[0], &seen, &transfer); sc_free(&seen); sc_free(&transfer); return result;}
void init_structured_clone_module(void) { ant_t *js = rt->js; ant_value_t global = js_glob(js);
js_set(js, global, "structuredClone", js_mkfun(js_structured_clone)); js_set_descriptor(js, global, "structuredClone", 15, JS_DESC_W | JS_DESC_C);}