Add toLocaleString for TypedArrays (#2987)

The algorithm is based on ECMA-262 v6, 22.2.3.27

Co-authored-by: Tibor Dusnoki tdusnoki@inf.u-szeged.hu
JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

tests/jerry/es2015/typedarray-prototype-tolocalestring.js

@@ -0,0 +1,105 @@
+// 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.
+
+var int_typedarrays = [
+    new Uint8Array([0, 1, 2, 3, 4, 5]),
+    new Uint16Array([0, 1, 2, 3, 4, 5]),
+    new Uint32Array([0, 1, 2, 3, 4, 5]),
+    new Int8Array([0, 1, 2, 3, 4, 5]),
+    new Int16Array([0, 1, 2, 3, 4, 5]),
+    new Int32Array([0, 1, 2, 3, 4, 5])
+];
+
+var float_typedarrays = [
+    new Float32Array([0, 1, 2, 3, 4, 5]),
+    new Float64Array([0, 1, 2, 3, 4, 5]),
+];
+
+int_typedarrays.forEach(function(e){
+    // Test with normal inputs
+    assert(e.toLocaleString() === "0,1,2,3,4,5");
+    e.set([3, 3, 6, 1, 2, 9]);
+    assert(e.toLocaleString() === "3,3,6,1,2,9");
+    e.set([32, 12, 2, 8, 32, 1]);
+    assert(e.toLocaleString() === "32,12,2,8,32,1");
+    // Test with undefined
+    e.set([12, undefined, 0, undefined, 3, 5]);
+    assert(e.toLocaleString() === "12,0,0,0,3,5");
+    // Test with null
+    e.set([null, 3, 3, 3, null, 10]);
+    assert(e.toLocaleString() === "0,3,3,3,0,10");
+    e.set([12, null, 21, null, null, null]);
+    assert(e.toLocaleString() === "12,0,21,0,0,0");
+});
+
+float_typedarrays.forEach(function(e){
+    // Test with normal inputs
+    assert(e.toLocaleString() === "0,1,2,3,4,5");
+    e.set([3, 3, 6, 1, 2, 9]);
+    assert(e.toLocaleString() === "3,3,6,1,2,9");
+    e.set([32, 12, 2, 8, 32, 1]);
+    assert(e.toLocaleString() === "32,12,2,8,32,1");
+    // Test with undefined
+    e.set([12, undefined, 0, undefined, 3, 5]);
+    assert(e.toLocaleString() === "12,NaN,0,NaN,3,5");
+    // Test with null
+    e.set([null, 3, 3, 3, null, 10]);
+    assert(e.toLocaleString() === "0,3,3,3,0,10");
+    e.set([12, null, 21, null, null, null]);
+    assert(e.toLocaleString() === "12,0,21,0,0,0");
+});
+
+// Test empty TypedArrays
+var empty_typedarrays = [
+    new Uint8Array([]),
+    new Uint16Array([]),
+    new Uint32Array([]),
+    new Float32Array([]),
+    new Float64Array([]),
+    new Int8Array([]),
+    new Int16Array([]),
+    new Int32Array([])
+];
+
+empty_typedarrays.forEach(function(e){
+    assert(e.toLocaleString() === "");
+});
+
+Number.prototype.toLocaleString = function() { return "5" }
+
+var typedarrays = [
+    new Uint8Array([10]),
+    new Uint16Array([10]),
+    new Uint32Array([10]),
+    new Float32Array([10]),
+    new Float64Array([10]),
+    new Int8Array([10]),
+    new Int16Array([10]),
+    new Int32Array([10])
+];
+
+typedarrays.forEach(function(e){
+    assert(e.toLocaleString() === "5");
+});
+
+Number.prototype.toLocaleString = "foo";
+
+typedarrays.forEach(function(e){
+    try {
+        assert(e.toLocaleString() === "foo");
+        assert(false);
+    } catch (err) {
+        assert(err instanceof TypeError);
+    }
+});