Implement numeric-separator (#4158)

JerryScript-DCO-1.0-Signed-off-by: bence gabor kis kisbg@inf.u-szeged.hu

tests/jerry/es.next/numeric-separator.js

@@ -0,0 +1,45 @@
+// 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.
+
+
+// few valid numeric separators
+assert (1_1 == 11)
+assert (0x11_11 == 4369)
+assert (0b11_11 == 15)
+assert (0o11_11 == 585)
+assert (1_1n == 11n)
+assert (100_001.11_00 == 100001.11)
+assert (0x11_11n == 4369n)
+
+// checker functions
+
+function invalid_numeric_separator (expression)
+{
+  try {
+    var a = eval (expression)
+    assert (false)
+  } catch (e) {
+    assert (true)
+  }
+}
+
+// few invalid numeric separators
+invalid_numeric_separator ("_1_1")
+invalid_numeric_separator ("1__1")
+invalid_numeric_separator ("1_1_n")
+invalid_numeric_separator ("1_1n_")
+invalid_numeric_separator ("0b_11")
+invalid_numeric_separator ("0x_11")
+invalid_numeric_separator ("0o_11")
+invalid_numeric_separator ("0_0.123")