Implement String.prototype.substring()

JerryScript-DCO-1.0-Signed-off-by: Laszlo Vidacs lvidacs.u-szeged@partner.samsung.com

tests/jerry/string-prototype-substring.js

@@ -0,0 +1,140 @@
+// Copyright 2015 Samsung Electronics Co., Ltd.
+// Copyright 2015 University of Szeged.
+//
+// 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.
+
+// check properties
+assert(Object.getOwnPropertyDescriptor(String.prototype.substring, 'length').configurable === false);
+
+assert(Object.getOwnPropertyDescriptor(String.prototype.substring, 'length').enumerable === false);
+
+assert(Object.getOwnPropertyDescriptor(String.prototype.substring, 'length').writable === false);
+
+assert(String.prototype.substring.length === 2);
+
+assert(String.prototype.substring.call(new String()) === "");
+
+assert(String.prototype.substring.call({}) === "[object Object]");
+
+// check this is undefined
+try {
+  String.prototype.substring.call(undefined);
+  assert(false);
+} catch(e) {
+  assert(e instanceof TypeError);
+}
+
+// check this is null
+try {
+  String.prototype.substring.call(null);
+  assert(false);
+} catch(e) {
+  assert(e instanceof TypeError);
+}
+
+// simple checks
+assert("hello world!".substring(0, 11) === "hello world");
+
+assert("hello world!".substring(11, 0) === "hello world");
+
+assert("hello world!".substring(0, 12) === "hello world!");
+
+assert("hello world!".substring(12, 0) === "hello world!");
+
+// check NaN
+assert("hello world!".substring(NaN, 12) === "hello world!");
+
+// check NaN
+assert("hello world!".substring(2, NaN) === "he");
+
+// check end undefined
+assert("hello world!".substring(2, undefined) === "llo world!");
+
+// check negative
+assert("hello world!".substring(-1,8) === "hello wo");
+
+// check negative
+assert("hello\tworld!".substring(5,-8) === "hello");
+
+// check negative
+assert("hello world!".substring(-1,-8) === "");
+
+// check ranges
+assert("hello world!".substring(-1,10000) === "hello world!");
+
+assert("hello world!".substring(10000,1000000) === "");
+
+assert("hello world!".substring(100000,1) === "ello world!");
+
+// check both undefined
+assert("hello world!".substring(undefined, undefined) === "hello world!");
+
+var undef_var;
+assert("hello world!".substring(undef_var, undef_var) === "hello world!");
+
+// check integer conversion
+assert("hello world!".substring(undefined, 5) === "hello");
+
+assert("hello world!".substring(undefined, "bar") === "");
+
+assert("hello world!".substring(2, true) === "e");
+
+assert("hello world!".substring(2, false) === "he");
+
+assert("hello world!".substring(5, obj) === " world!");
+
+// check other objects
+var obj = { substring : String.prototype.substring }
+
+obj.toString = function() {
+    return "Iam";
+}
+assert(obj.substring(100000,1) === "am");
+
+obj.toString = function() {
+  throw new ReferenceError ("foo");
+};
+
+try {
+  assert(obj.substring(100000,1));
+  assert(false);
+} catch (e) {
+  assert(e.message === "foo");
+  assert(e instanceof ReferenceError);
+}
+
+// check coercible - undefined
+try {
+  assert(true.substring() === "");
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+// check coercible - null
+try {
+  assert(String.prototype.substring.call(null, 0, 1) === "");
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+// check coercible - Boolean
+assert(String.prototype.substring.call(true, 0, 1) === "t");
+
+// check coercible - Object
+var test_object = {firstName:"John", lastName:"Doe"};
+assert(String.prototype.substring.call(test_object, 0, 7) === "[object");
+
+// check coercible - Number
+assert(String.prototype.substring.call(123, 0, 3) === "123");