Implement namespace exports in modules (#4708)

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

jerry-core/ecma/base/ecma-module.c

@@ -474,8 +474,21 @@ ecma_module_resolve_export (ecma_module_t *const module_p, /**< base module */
           {
             ecma_module_t *target_module_p = ecma_module_get_from_object (*indirect_export_p->u.module_object_p);
 
-            if (!ecma_module_resolve_set_append (resolve_set_p, target_module_p, export_names_p->local_name_p)
-                && resolve_result_p->result_type == ECMA_MODULE_RESOLVE_NOT_FOUND)
+            if (ecma_compare_ecma_string_to_magic_id (export_names_p->local_name_p,
+                                                      LIT_MAGIC_STRING_ASTERIX_CHAR))
+            {
+              /* Namespace export. */
+              ecma_value_t namespace = ecma_make_object_value (target_module_p->namespace_object_p);
+
+              JERRY_ASSERT (namespace & ECMA_MODULE_NAMESPACE_RESULT_FLAG);
+
+              if (!ecma_module_resolve_update (resolve_result_p, namespace))
+              {
+                goto exit;
+              }
+            }
+            else if (!ecma_module_resolve_set_append (resolve_set_p, target_module_p, export_names_p->local_name_p)
+                     && resolve_result_p->result_type == ECMA_MODULE_RESOLVE_NOT_FOUND)
             {
               resolve_result_p->result_type = ECMA_MODULE_RESOLVE_CIRCULAR;
             }

jerry-core/parser/js/js-parser-statm.c

@@ -2618,13 +2618,47 @@ parser_parse_export_statement (parser_context_t *context_p) /**< context */
     case LEXER_MULTIPLY:
     {
       lexer_next_token (context_p);
+
+      ecma_module_node_t **target_node_list_p = &(JERRY_CONTEXT (module_current_p)->star_exports_p);
+
+      if (lexer_token_is_identifier (context_p, "as", 2))
+      {
+        target_node_list_p = &(JERRY_CONTEXT (module_current_p)->indirect_exports_p);
+
+        lexer_next_token (context_p);
+
+        if (context_p->token.type != LEXER_LITERAL
+            || context_p->token.lit_location.type != LEXER_IDENT_LITERAL)
+        {
+          parser_raise_error (context_p, PARSER_ERR_IDENTIFIER_EXPECTED);
+        }
+
+        lexer_construct_literal_object (context_p, &context_p->token.lit_location, LEXER_NEW_IDENT_LITERAL);
+
+        lexer_literal_t *literal_p = PARSER_GET_LITERAL (context_p->lit_object.index);
+        ecma_string_t *export_name_p = ecma_new_ecma_string_from_utf8 (literal_p->u.char_p,
+                                                                       literal_p->prop.length);
+
+        if (parser_module_check_duplicate_export (context_p, export_name_p))
+        {
+          ecma_deref_ecma_string (export_name_p);
+          parser_raise_error (context_p, PARSER_ERR_DUPLICATED_EXPORT_IDENTIFIER);
+        }
+
+        ecma_string_t *local_name_p = ecma_get_magic_string (LIT_MAGIC_STRING_ASTERIX_CHAR);
+        parser_module_add_names_to_node (context_p, export_name_p, local_name_p);
+        ecma_deref_ecma_string (export_name_p);
+
+        lexer_next_token (context_p);
+      }
+
       if (!lexer_token_is_identifier (context_p, "from", 4))
       {
         parser_raise_error (context_p, PARSER_ERR_FROM_EXPECTED);
       }
 
       lexer_next_token (context_p);
-      parser_module_handle_module_specifier (context_p, &(JERRY_CONTEXT (module_current_p)->star_exports_p));
+      parser_module_handle_module_specifier (context_p, target_node_list_p);
       return false;
     }
     case LEXER_KEYW_VAR:

jerry-core/parser/js/js-scanner.c

@@ -1851,6 +1851,20 @@ scanner_scan_statement (parser_context_t *context_p, /**< context */
       if (context_p->token.type == LEXER_MULTIPLY)
       {
         lexer_next_token (context_p);
+
+        if (lexer_token_is_identifier (context_p, "as", 2))
+        {
+          lexer_next_token (context_p);
+
+          if (context_p->token.type != LEXER_LITERAL
+              && context_p->token.lit_location.type == LEXER_IDENT_LITERAL)
+          {
+            scanner_raise_error (context_p);
+          }
+
+          lexer_next_token (context_p);
+        }
+
         if (!lexer_token_is_identifier (context_p, "from", 4))
         {
           scanner_raise_error (context_p);

tests/jerry/es.next/module-export-10.mjs

@@ -0,0 +1,33 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* Export the same namespace using two names */
+export
+  * as ns1 from
+  "./module-export-04.mjs"
+export * as
+  ns2
+  from "./module-export-04.mjs"
+export *
+  as ns3 from "./module-export-04.mjs"
+
+/* Local bindings can have the same names as exports. */
+import ns1, {x as ns2}
+  from "./module-export-04.mjs"
+let ns3 = 9.5
+
+assert(ns1 === "str")
+assert(ns2 === 41)
+assert(ns3 === 9.5)

tests/jerry/es.next/module-import-07.mjs

@@ -0,0 +1,30 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {ns1 as obj, ns2} from "module-export-10.mjs"
+import {ns3} from "module-export-10.mjs"
+
+assert(typeof obj === "object")
+assert(obj === ns2)
+assert(obj === ns3)
+
+assert(obj.x === 41)
+try {
+  obj.x = 42
+  assert(false)
+} catch (e) {
+  assert(e instanceof TypeError)
+}
+assert(obj.x === 41)

tests/jerry/fail/module-024.mjs

@@ -13,5 +13,6 @@
  * limitations under the License.
  */
 
-/* Star exports can't have an export name. */
-export * as star from "../es.next/module-export-01.mjs"
+export function ns() {}
+/* Duplicated export. */
+export * as ns from "../es.next/module-export-fail-test.mjs"