public static string PathMakeStandard(string path)
{
return(PathMakeStandard(path, !Util.IsRunningOnUnix()));
}
static FileSystemStringComparer()
{
s_hostOsIsCaseSensitive = Util.IsRunningOnUnix();
}
public static unsafe string SimplifyPath(string path)
{
if (path.Length == 0)
{
return(string.Empty);
}
if (path == ".")
{
return(path);
}
string simplifiedPath = s_cachedSimplifiedPaths.GetOrAdd(path, s =>
{
// First construct a path helper to help with the conversion
char *arrayPtr = stackalloc char[PathHelper.MaxPath];
PathHelper pathHelper = new PathHelper(arrayPtr, PathHelper.MaxPath);
int index = 0;
int pathLength = path.Length;
int numDot = 0;
int lowestRemovableIndex = 0;
for (; index < pathLength; ++index)
{
char currentChar = path[index];
if (currentChar == OtherSeparator)
{
currentChar = Path.DirectorySeparatorChar;
}
if (currentChar == '.')
{
++numDot;
if (numDot > 2)
{
throw new ArgumentException($"Invalid path format: {path}");
}
}
else
{
if (numDot == 1)
{
if (currentChar == Path.DirectorySeparatorChar)
{
// Path starts a path of the format .\
numDot = 0;
continue;
}
else
{
pathHelper.Append('.');
}
numDot = 0;
pathHelper.Append(currentChar);
}
else if (numDot == 2)
{
if (currentChar != Path.DirectorySeparatorChar)
{
throw new ArgumentException($"Invalid path format: {path}");
}
// Path contains a path of the format ..\
bool success = pathHelper.RemoveLastDirectory(lowestRemovableIndex);
if (!success)
{
pathHelper.Append('.');
pathHelper.Append('.');
lowestRemovableIndex = pathHelper.Length;
}
numDot = 0;
if (pathHelper.Length > 0)
{
pathHelper.Append(currentChar);
}
}
else
{
if (Util.IsRunningOnUnix() &&
index == 0 && currentChar == Path.DirectorySeparatorChar && Path.IsPathRooted(path))
{
pathHelper.Append(currentChar);
}
if (currentChar != Path.DirectorySeparatorChar || pathHelper.Length > 0)
{
pathHelper.Append(currentChar);
}
}
}
}
if (numDot == 2)
{
// Path contains a path of the format \..\
if (!pathHelper.RemoveLastDirectory(lowestRemovableIndex))
{
pathHelper.Append('.');
pathHelper.Append('.');
}
}
return(pathHelper.ToString());
});
return(simplifiedPath);
}
