Attachment #462663 for bug #55366

Attachment #462663: Patch 7: Change navigator.language to use Accept-Language for bug #55366

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 *   Brendan Eich <brendan@mozilla.org>
 *   David Hyatt (hyatt@netscape.com)
 *   Dan Rosen <dr@netscape.com>
 *   Vidur Apparao <vidur@netscape.com>
 *   Johnny Stenback <jst@netscape.com>
 *   Mark Hammond <mhammond@skippinet.com.au>
 *   Ryan Jones <sciguyryan@gmail.com>
 *   Jeff Walden <jwalden+code@mit.edu>
 *   Ben Bucksch <ben.bucksch  beonex.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your

#include "nsXPIDLString.h"
#include "nsJSUtils.h"
#include "prmem.h"
#include "jsapi.h"              // for JSAutoRequest
#include "jsdbgapi.h"           // for JS_ClearWatchPointsForObject
#include "nsReadableUtils.h"
#include "nsDOMClassInfo.h"
#include "nsContentUtils.h"
#include "nsCharSeparatedTokenizer.h" // for Accept-Language parsing
#include "nsUnicharUtils.h"

// Other Classes
#include "nsIEventListenerManager.h"
#include "nsEscape.h"
#include "nsStyleCoord.h"
#include "nsMimeTypeArray.h"
#include "nsNetUtil.h"
#include "nsICachingChannel.h"

      return NS_OK;
    }
  }

  aAppName.AssignLiteral("Netscape");
  return NS_OK;
}

/**
 * JS property navigator.language, exposed to web content.
 * Take first value from Accept-Languages (HTTP header), which is
 * the "content language" freely set by the user in the Pref window.
 *
 * Do not use UI language (chosen app locale) here.
 * See RFC 2616, Section 15.1.4 "Privacy Issues Connected to Accept Headers"
 *
 * "en", "en-US" and "i-cherokee" and "" are valid.
 * Fallback in case of invalid pref should be "" (empty string), to
 * let site do fallback, e.g. to site's local language.
 */
NS_IMETHODIMP
nsNavigator::GetLanguage(nsAString& aLanguage)
{
  // e.g. "de-de, en-us,en"
  const nsAdoptingString& acceptLang =
      nsContentUtils::GetLocalizedStringPref("intl.accept_languages");
  // take everything before the first "," or ";", without trailing space
  nsCharSeparatedTokenizer langTokenizer(acceptLang, ',');
  const nsSubstring &firstLangPart = langTokenizer.nextToken();
  nsCharSeparatedTokenizer qTokenizer(firstLangPart, ';');
  aLanguage.Assign(qTokenizer.nextToken());

  // checks and fixups
  // replace "_" with "-", to avoid POSIX/Windows "en_US" notation
  if (aLanguage.Length() > 2 && aLanguage[2] == PRUnichar('_'))
    aLanguage.Replace(2, 1, PRUnichar('-')); // TODO replace all
  // use uppercase for country part, e.g. "en-US", not "en-us", see BCP47
  // only uppercase 2-letter country codes, not "zh-Hant", "de-DE-x-goethe"
  if (aLanguage.Length() > 2)
  {
    nsCharSeparatedTokenizer localeTokenizer(aLanguage, '-');
    PRInt32 pos = 0;
    bool first = true;
    while (localeTokenizer.hasMoreTokens())
    {
      const nsSubstring &code = localeTokenizer.nextToken();
      if (code.Length() == 2 && !first)
      {
        nsAutoString upper(code);
        ::ToUpperCase(upper);
        aLanguage.Replace(pos, code.Length(), upper);
      }
      pos += code.Length() + 1; // 1 is the separator
      if (first)
        first = false;
    }
  }
  return NS_OK;
}

NS_IMETHODIMP
nsNavigator::GetPlatform(nsAString& aPlatform)
{
  if (!nsContentUtils::IsCallerTrustedForRead()) {
    const nsAdoptingCString& override =
      nsContentUtils::GetCharPref("general.platform.override");

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