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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Resources;
using System.Runtime.CompilerServices;
using System.Threading;
namespace System
{
internal partial class SR
{
private static ResourceManager s_resourceManager;
private static ResourceManager ResourceManager
{
get
{
if (SR.s_resourceManager == null)
{
SR.s_resourceManager = new ResourceManager(SR.ResourceType);
}
return SR.s_resourceManager;
}
}
// This method is used to decide if we need to append the exception message parameters to the message when calling SR.Format.
// by default it returns false.
[MethodImpl(MethodImplOptions.NoInlining)]
private static bool UsingResourceKeys()
{
return false;
}
// Needed for debugger integration
internal static string GetResourceString(string resourceKey)
{
return GetResourceString(resourceKey, String.Empty);
}
internal static string GetResourceString(string resourceKey, string defaultString)
{
string resourceString = null;
try { resourceString = InternalGetResourceString(resourceKey); }
catch (MissingManifestResourceException) { }
if (defaultString != null && resourceKey.Equals(resourceString, StringComparison.Ordinal))
{
return defaultString;
}
return resourceString;
}
private static object _lock = new object();
private static List<string> _currentlyLoading;
private static int _infinitelyRecursingCount;
private static string InternalGetResourceString(string key)
{
if (key == null || key.Length == 0)
{
Debug.Fail("SR::GetResourceString with null or empty key. Bug in caller, or weird recursive loading problem?");
return key;
}
// We have a somewhat common potential for infinite
// loops with mscorlib's ResourceManager. If "potentially dangerous"
// code throws an exception, we will get into an infinite loop
// inside the ResourceManager and this "potentially dangerous" code.
// Potentially dangerous code includes the IO package, CultureInfo,
// parts of the loader, some parts of Reflection, Security (including
// custom user-written permissions that may parse an XML file at
// class load time), assembly load event handlers, etc. Essentially,
// this is not a bounded set of code, and we need to fix the problem.
// Fortunately, this is limited to mscorlib's error lookups and is NOT
// a general problem for all user code using the ResourceManager.
// The solution is to make sure only one thread at a time can call
// GetResourceString. Also, since resource lookups can be
// reentrant, if the same thread comes into GetResourceString
// twice looking for the exact same resource name before
// returning, we're going into an infinite loop and we should
// return a bogus string.
bool lockTaken = false;
try
{
Monitor.Enter(_lock, ref lockTaken);
// Are we recursively looking up the same resource? Note - our backout code will set
// the ResourceHelper's currentlyLoading stack to null if an exception occurs.
if (_currentlyLoading != null && _currentlyLoading.Count > 0 && _currentlyLoading.LastIndexOf(key) != -1)
{
// We can start infinitely recursing for one resource lookup,
// then during our failure reporting, start infinitely recursing again.
// avoid that.
if (_infinitelyRecursingCount > 0)
{
return key;
}
_infinitelyRecursingCount++;
}
if (_currentlyLoading == null)
_currentlyLoading = new List<string>();
_currentlyLoading.Add(key); // Push
string s = ResourceManager.GetString(key, null);
_currentlyLoading.RemoveAt(_currentlyLoading.Count - 1); // Pop
Debug.Assert(s != null, "Managed resource string lookup failed. Was your resource name misspelled? Did you rebuild mscorlib after adding a resource to resources.txt? Debug this w/ cordbg and bug whoever owns the code that called SR.GetResourceString. Resource name was: \"" + key + "\"");
return s ?? key;
}
catch
{
if (lockTaken)
{
// Backout code - throw away potentially corrupt state
_currentlyLoading = null;
}
throw;
}
finally
{
if (lockTaken)
{
Monitor.Exit(_lock);
}
}
}
internal static string Format(string resourceFormat, params object[] args)
{
if (args != null)
{
if (UsingResourceKeys())
{
return resourceFormat + String.Join(", ", args);
}
return String.Format(resourceFormat, args);
}
return resourceFormat;
}
internal static string Format(string resourceFormat, object p1)
{
if (UsingResourceKeys())
{
return String.Join(", ", resourceFormat, p1);
}
return String.Format(resourceFormat, p1);
}
internal static string Format(string resourceFormat, object p1, object p2)
{
if (UsingResourceKeys())
{
return String.Join(", ", resourceFormat, p1, p2);
}
return String.Format(resourceFormat, p1, p2);
}
internal static string Format(string resourceFormat, object p1, object p2, object p3)
{
if (UsingResourceKeys())
{
return String.Join(", ", resourceFormat, p1, p2, p3);
}
return String.Format(resourceFormat, p1, p2, p3);
}
}
}
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