68 lines
2.9 KiB
C#
68 lines
2.9 KiB
C#
|
//------------------------------------------------------------------------------
|
|||
|
|
// <copyright file="CultureUtil.cs" company="Microsoft">
|
|||
|
|
// Copyright (c) Microsoft Corporation. All rights reserved.
|
|||
|
|
// </copyright>
|
|||
|
|
//------------------------------------------------------------------------------
|
|||
|
|
|
|||
|
|
namespace System.Web.Util {
|
|||
|
|
using System;
|
|||
|
|
using System.Globalization;
|
|||
|
|
|
|||
|
|
// This class contains helper methods for obtaining a CultureInfo instance from a list of candidates.
|
|||
|
|
|
|||
|
|
internal static class CultureUtil {
|
|||
|
|
|
|||
|
|
// Given a single culture name, attempts to turn it into a CultureInfo.
|
|||
|
|
// If 'requireSpecific' is set, this method attempts to return an object where IsNeutral = false.
|
|||
|
|
public static CultureInfo CreateReadOnlyCulture(string cultureName, bool requireSpecific) {
|
|||
|
|
if (requireSpecific) {
|
|||
|
|
return HttpServerUtility.CreateReadOnlySpecificCultureInfo(cultureName);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
return HttpServerUtility.CreateReadOnlyCultureInfo(cultureName);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Given a list of culture names, loop through them until we find one we understand.
|
|||
|
|
// We expect 'cultureNames' to be the raw Accept-Languages header value, as we'll strip q-values.
|
|||
|
|
// Otherwise equivalent to the single-element overload.
|
|||
|
|
public static CultureInfo CreateReadOnlyCulture(string[] cultureNames, bool requireSpecific) {
|
|||
|
|
return ExtractCultureImpl(cultureNames, requireSpecific, AppSettings.MaxAcceptLanguageFallbackCount);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// for unit testing, uses 'maxCount' instead of the <appSettings> switch
|
|||
|
|
internal static CultureInfo ExtractCultureImpl(string[] cultureNames, bool requireSpecific, int maxCount) {
|
|||
|
|
int lastIndex = Math.Min(cultureNames.Length, maxCount) - 1;
|
|||
|
|
|
|||
|
|
for (int i = 0; i < cultureNames.Length; i++) {
|
|||
|
|
string candidate = StripQValue(cultureNames[i]);
|
|||
|
|
|
|||
|
|
try {
|
|||
|
|
return CreateReadOnlyCulture(candidate, requireSpecific);
|
|||
|
|
}
|
|||
|
|
catch (CultureNotFoundException) {
|
|||
|
|
// If this is the last iteration before giving up, let the exception propagate upward.
|
|||
|
|
// Otherwise just ---- and move on to the next candidate.
|
|||
|
|
if (i == lastIndex) {
|
|||
|
|
throw;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return null;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Given an input "foo;q=xx", returns "foo".
|
|||
|
|
private static string StripQValue(string input) {
|
|||
|
|
if (input != null) {
|
|||
|
|
int indexOfSemicolon = input.IndexOf(';');
|
|||
|
|
if (indexOfSemicolon >= 0) {
|
|||
|
|
return input.Substring(0, indexOfSemicolon);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
return input;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
}
|
|||
|
|
}
|