Upgrade V8 to 5.1.281.57 DO NOT MERGE
FPIIM-449
Change-Id: Id981b686b4d587ac31697662eb98bb34be42ad90
(cherry picked from commit 3b9bc31999c9787eb726ecdbfd5796bfdec32a18)
diff --git a/src/js/harmony-string-padding.js b/src/js/harmony-string-padding.js
new file mode 100644
index 0000000..a6c6c47
--- /dev/null
+++ b/src/js/harmony-string-padding.js
@@ -0,0 +1,77 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+(function(global, utils) {
+
+%CheckIsBootstrapping();
+
+// -------------------------------------------------------------------
+// Imports
+
+var GlobalString = global.String;
+var MakeTypeError;
+
+utils.Import(function(from) {
+ MakeTypeError = from.MakeTypeError;
+});
+
+// -------------------------------------------------------------------
+// http://tc39.github.io/proposal-string-pad-start-end/
+
+function StringPad(thisString, maxLength, fillString) {
+ maxLength = TO_LENGTH(maxLength);
+ var stringLength = thisString.length;
+
+ if (maxLength <= stringLength) return "";
+
+ if (IS_UNDEFINED(fillString)) {
+ fillString = " ";
+ } else {
+ fillString = TO_STRING(fillString);
+ if (fillString === "") {
+ fillString = " ";
+ }
+ }
+
+ var fillLength = maxLength - stringLength;
+ var repetitions = (fillLength / fillString.length) | 0;
+ var remainingChars = (fillLength - fillString.length * repetitions) | 0;
+
+ var filler = "";
+ while (true) {
+ if (repetitions & 1) filler += fillString;
+ repetitions >>= 1;
+ if (repetitions === 0) break;
+ fillString += fillString;
+ }
+
+ if (remainingChars) {
+ filler += %_SubString(fillString, 0, remainingChars);
+ }
+
+ return filler;
+}
+
+function StringPadStart(maxLength, fillString) {
+ CHECK_OBJECT_COERCIBLE(this, "String.prototype.padStart")
+ var thisString = TO_STRING(this);
+
+ return StringPad(thisString, maxLength, fillString) + thisString;
+}
+%FunctionSetLength(StringPadStart, 1);
+
+function StringPadEnd(maxLength, fillString) {
+ CHECK_OBJECT_COERCIBLE(this, "String.prototype.padEnd")
+ var thisString = TO_STRING(this);
+
+ return thisString + StringPad(thisString, maxLength, fillString);
+}
+%FunctionSetLength(StringPadEnd, 1);
+
+utils.InstallFunctions(GlobalString.prototype, DONT_ENUM, [
+ "padStart", StringPadStart,
+ "padEnd", StringPadEnd
+]);
+
+});