Implements ES6 String.prototype.normalize method.

src/string.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 182 matching lines @@
     if (result !== null) lastMatchInfoOverride = null;
     regexp.lastIndex = 0;
     return result;
   }
   // Non-regexp argument.
   regexp = new $RegExp(regexp);
   return RegExpExecNoTests(regexp, subject, 0);
 }
 
 
+var NORMALIZATION_FORMS = ['NFC', 'NFD', 'NFKC', 'NFKD'];
+
+
+// ECMA-262 v6, section 21.1.3.12
+//
+// For now we do nothing, as proper normalization requires big tables.
+// If Intl is enabled, then i18n.js will override it and provide the the
+// proper functionality.
+function StringNormalize(form) {
+  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {

[mathias, 2014/01/29 09:05:55]

While this is correct, it might be better to just use the
`CHECK_OBJECT_COERCIBLE` macro.

+    throw MakeTypeError("called_on_null_or_undefined",
+                        ["String.prototype.localeCompare"]);

[mathias, 2014/01/29 09:05:55]

s/localeCompare/normalize/

+  }
+
+  var form = form ? TO_STRING_INLINE(form) : 'NFC';
+  var normalizationForm = NORMALIZATION_FORMS.indexOf(form);
+  if (normalizationForm === -1) {
+    throw new $RangeError('The normalization form should be one of '
+        + NORMALIZATION_FORMS.join(', ') + '.');
+  }
+
+  return %_ValueOf(this);
+}
+
+
 // This has the same size as the lastMatchInfo array, and can be used for
 // functions that expect that structure to be returned.  It is used when the
 // needle is a string rather than a regexp.  In this case we can't update
 // lastMatchArray without erroneously affecting the properties on the global
 // RegExp object.
 var reusableMatchInfo = [2, "", "", -1, -1];
 
 
 // ECMA-262, section 15.5.4.11
 function StringReplace(search, replace) {
@@ skipping 764 matching lines @@
   InstallFunctions($String.prototype, DONT_ENUM, $Array(
     "valueOf", StringValueOf,
     "toString", StringToString,
     "charAt", StringCharAt,
     "charCodeAt", StringCharCodeAt,
     "concat", StringConcat,
     "indexOf", StringIndexOf,
     "lastIndexOf", StringLastIndexOf,
     "localeCompare", StringLocaleCompare,
     "match", StringMatch,
+    "normalize", StringNormalize,
     "replace", StringReplace,
     "search", StringSearch,
     "slice", StringSlice,
     "split", StringSplit,
     "substring", StringSubstring,
     "substr", StringSubstr,
     "toLowerCase", StringToLowerCase,
     "toLocaleLowerCase", StringToLocaleLowerCase,
     "toUpperCase", StringToUpperCase,
     "toLocaleUpperCase", StringToLocaleUpperCase,
@@ skipping 10 matching lines @@
     "fixed", StringFixed,
     "italics", StringItalics,
     "small", StringSmall,
     "strike", StringStrike,
     "sub", StringSub,
     "sup", StringSup
   ));
 }
 
 SetUpString();