Implements ES6 String.prototype.normalize method.

src/string.js

Index: src/string.js
diff --git a/src/string.js b/src/string.js
index 8e4b896eae5492bab3c1efb5a7222a4c6b9be654..74230c986411247d7d8f5dfdea869a1efff5c49e 100644
--- a/src/string.js
+++ b/src/string.js
@@ -186,6 +186,28 @@ function StringMatch(regexp) {
 }
 
 
+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) {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.normalize");
+
+  var form = form ? TO_STRING_INLINE(form) : 'NFC';
+  var normalizationForm = NORMALIZATION_FORMS.indexOf(form);

[arv (Not doing code reviews), 2014/04/10 18:20:10]

same here?

[mnita, 2014/04/10 21:20:30]

Done.

+  if (normalizationForm === -1) {
+    throw new $RangeError('The normalization form should be one of '
+        + NORMALIZATION_FORMS.join(', ') + '.');

[arv (Not doing code reviews), 2014/04/10 18:20:10]

and here

[mnita, 2014/04/10 21:20:30]

Done.

+  }
+
+  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
@@ -942,6 +964,7 @@ function SetUpString() {
     "lastIndexOf", StringLastIndexOf,
     "localeCompare", StringLocaleCompare,
     "match", StringMatch,
+    "normalize", StringNormalize,
     "replace", StringReplace,
     "search", StringSearch,
     "slice", StringSlice,