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added JSON modules and import attributes

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This commit is contained in:
Fabrice Bellard
2025-05-20 18:27:23 +02:00
parent 838124580b
commit f10ef299a6
10 changed files with 424 additions and 100 deletions
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112
quickjs-libc.c
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@@ -591,8 +591,72 @@ int js_module_set_import_meta(JSContext *ctx, JSValueConst func_val,
return 0;
}
static int json_module_init(JSContext *ctx, JSModuleDef *m)
{
JSValue val;
val = JS_GetModulePrivateValue(ctx, m);
JS_SetModuleExport(ctx, m, "default", val);
return 0;
}
/* in order to conform with the specification, only the keys should be
tested and not the associated values. */
int js_module_check_attributes(JSContext *ctx, void *opaque,
JSValueConst attributes)
{
JSPropertyEnum *tab;
uint32_t i, len;
int ret;
const char *cstr;
size_t cstr_len;
if (JS_GetOwnPropertyNames(ctx, &tab, &len, attributes, JS_GPN_ENUM_ONLY | JS_GPN_STRING_MASK))
return -1;
ret = 0;
for(i = 0; i < len; i++) {
cstr = JS_AtomToCStringLen(ctx, &cstr_len, tab[i].atom);
if (!cstr) {
ret = -1;
break;
}
if (!(cstr_len == 4 && !memcmp(cstr, "type", cstr_len))) {
JS_ThrowTypeError(ctx, "import attribute '%s' is not supported", cstr);
ret = -1;
}
JS_FreeCString(ctx, cstr);
if (ret)
break;
}
JS_FreePropertyEnum(ctx, tab, len);
return ret;
}
/* return TRUE if the attributes indicate a JSON module */
JS_BOOL js_module_test_json(JSContext *ctx, JSValueConst attributes)
{
JSValue str;
const char *cstr;
size_t len;
BOOL res;
if (JS_IsUndefined(attributes))
return FALSE;
str = JS_GetPropertyStr(ctx, attributes, "type");
if (!JS_IsString(str))
return FALSE;
cstr = JS_ToCStringLen(ctx, &len, str);
JS_FreeValue(ctx, str);
if (!cstr)
return FALSE;
/* XXX: raise an error if unknown type ? */
res = (len == 4 && !memcmp(cstr, "json", len));
JS_FreeCString(ctx, cstr);
return res;
}
JSModuleDef *js_module_loader(JSContext *ctx,
const char *module_name, void *opaque)
const char *module_name, void *opaque,
JSValueConst attributes)
{
JSModuleDef *m;
@@ -601,7 +665,6 @@ JSModuleDef *js_module_loader(JSContext *ctx,
} else {
size_t buf_len;
uint8_t *buf;
JSValue func_val;
buf = js_load_file(ctx, &buf_len, module_name);
if (!buf) {
@@ -609,18 +672,37 @@ JSModuleDef *js_module_loader(JSContext *ctx,
module_name);
return NULL;
}
/* compile the module */
func_val = JS_Eval(ctx, (char *)buf, buf_len, module_name,
JS_EVAL_TYPE_MODULE | JS_EVAL_FLAG_COMPILE_ONLY);
js_free(ctx, buf);
if (JS_IsException(func_val))
return NULL;
/* XXX: could propagate the exception */
js_module_set_import_meta(ctx, func_val, TRUE, FALSE);
/* the module is already referenced, so we must free it */
m = JS_VALUE_GET_PTR(func_val);
JS_FreeValue(ctx, func_val);
if (has_suffix(module_name, ".json") ||
js_module_test_json(ctx, attributes)) {
/* compile as JSON */
JSValue val;
val = JS_ParseJSON(ctx, (char *)buf, buf_len, module_name);
js_free(ctx, buf);
if (JS_IsException(val))
return NULL;
m = JS_NewCModule(ctx, module_name, json_module_init);
if (!m) {
JS_FreeValue(ctx, val);
return NULL;
}
/* only export the "default" symbol which will contain the JSON object */
JS_AddModuleExport(ctx, m, "default");
JS_SetModulePrivateValue(ctx, m, val);
} else {
JSValue func_val;
/* compile the module */
func_val = JS_Eval(ctx, (char *)buf, buf_len, module_name,
JS_EVAL_TYPE_MODULE | JS_EVAL_FLAG_COMPILE_ONLY);
js_free(ctx, buf);
if (JS_IsException(func_val))
return NULL;
/* XXX: could propagate the exception */
js_module_set_import_meta(ctx, func_val, TRUE, FALSE);
/* the module is already referenced, so we must free it */
m = JS_VALUE_GET_PTR(func_val);
JS_FreeValue(ctx, func_val);
}
}
return m;
}
@@ -3478,7 +3560,7 @@ static void *worker_func(void *opaque)
JS_SetStripInfo(rt, args->strip_flags);
js_std_init_handlers(rt);
JS_SetModuleLoaderFunc(rt, NULL, js_module_loader, NULL);
JS_SetModuleLoaderFunc2(rt, NULL, js_module_loader, js_module_check_attributes, NULL);
/* set the pipe to communicate with the parent */
ts = JS_GetRuntimeOpaque(rt);