Implement String.prototype.trim()

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

tests/jerry/string-prototype-trim.js

@@ -0,0 +1,69 @@
+// 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.trim, 'length').configurable === false);
+
+assert(Object.getOwnPropertyDescriptor(String.prototype.trim, 'length').enumerable === false);
+
+assert(Object.getOwnPropertyDescriptor(String.prototype.trim, 'length').writable === false);
+
+assert(String.prototype.trim.length === 0);
+
+// check this value
+assert(String.prototype.trim.call(new String()) === "");
+
+assert(String.prototype.trim.call({}) === "[object Object]");
+
+// check undefined
+try {
+  String.prototype.trim.call(undefined);
+  assert(false);
+} catch(e) {
+  assert(e instanceof TypeError);
+}
+
+// check null
+try {
+  String.prototype.trim.call(null);
+  assert(false);
+} catch(e) {
+  assert(e instanceof TypeError);
+}
+
+// simple checks
+assert(" hello world".trim() === "hello world");
+
+assert("hello world ".trim() === "hello world");
+
+assert("    hello world   ".trim() === "hello world");
+
+assert("\t  hello world\n".trim() === "hello world");
+
+assert("\t\n  hello world\t \n ".trim() === "hello world");
+
+assert("hello world\n   \t\t".trim() === "hello world");
+
+assert(" hello world \\ ".trim() === "hello world \\");
+
+assert("**hello world**".trim() === "**hello world**");
+
+assert(" \t \n".trim() === "");
+
+assert("          ".trim() === "");
+
+assert("".trim() === "");
+
+// FIXME: add unicode tests when unicode support available