/// <summary>
/// Indicates whether the given path is a UNC or drive pattern root directory.
/// <para>Note: This function mimics the behavior of checking if Path.GetDirectoryName(path) == null.</para>
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
private static bool IsRootDirectory(string path)
{
// Eliminate all non-rooted paths
if (!Path.IsPathRooted(path))
{
return(false);
}
int uncMatchLength = FileUtilitiesRegex.StartsWithUncPatternMatchLength(path);
// Determine if the given path is a standard drive/unc pattern root
if (FileUtilitiesRegex.IsDrivePattern(path) ||
FileUtilitiesRegex.IsDrivePatternWithSlash(path) ||
uncMatchLength == path.Length)
{
return(true);
}
// Eliminate all non-root unc paths.
if (uncMatchLength != -1)
{
return(false);
}
// Eliminate any drive patterns that don't have a slash after the colon or where the 4th character is a non-slash
// A non-slash at [3] is specifically checked here because Path.GetDirectoryName
// considers "C:///" a valid root.
if (FileUtilitiesRegex.StartsWithDrivePattern(path) &&
((path.Length >= 3 && path[2] != '\\' && path[2] != '/') ||
(path.Length >= 4 && path[3] != '\\' && path[3] != '/')))
{
return(false);
}
// There are some edge cases that can get to this point.
// After eliminating valid / invalid roots, fall back on original behavior.
return(Path.GetDirectoryName(path) == null);
}
internal static string GetItemSpecModifier(string currentDirectory, string itemSpec, string definingProjectEscaped, string modifier, ref string fullPath)
{
ErrorUtilities.VerifyThrow(itemSpec != null, "Need item-spec to modify.");
ErrorUtilities.VerifyThrow(modifier != null, "Need modifier to apply to item-spec.");
string modifiedItemSpec = null;
try
{
if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.FullPath, StringComparison.OrdinalIgnoreCase))
{
if (fullPath != null)
{
return(fullPath);
}
if (currentDirectory == null)
{
currentDirectory = String.Empty;
}
modifiedItemSpec = GetFullPath(itemSpec, currentDirectory);
fullPath = modifiedItemSpec;
ThrowForUrl(modifiedItemSpec, itemSpec, currentDirectory);
}
else if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.RootDir, StringComparison.OrdinalIgnoreCase))
{
GetItemSpecModifier(currentDirectory, itemSpec, definingProjectEscaped, ItemSpecModifiers.FullPath, ref fullPath);
modifiedItemSpec = Path.GetPathRoot(fullPath);
if (!EndsWithSlash(modifiedItemSpec))
{
ErrorUtilities.VerifyThrow(FileUtilitiesRegex.StartsWithUncPattern(modifiedItemSpec),
"Only UNC shares should be missing trailing slashes.");
// restore/append trailing slash if Path.GetPathRoot() has either removed it, or failed to add it
// (this happens with UNC shares)
modifiedItemSpec += Path.DirectorySeparatorChar;
}
}
else if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.Filename, StringComparison.OrdinalIgnoreCase))
{
// if the item-spec is a root directory, it can have no filename
if (IsRootDirectory(itemSpec))
{
// NOTE: this is to prevent Path.GetFileNameWithoutExtension() from treating server and share elements
// in a UNC file-spec as filenames e.g. \\server, \\server\share
modifiedItemSpec = String.Empty;
}
else
{
// Fix path to avoid problem with Path.GetFileNameWithoutExtension when backslashes in itemSpec on Unix
modifiedItemSpec = Path.GetFileNameWithoutExtension(FixFilePath(itemSpec));
}
}
else if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.Extension, StringComparison.OrdinalIgnoreCase))
{
// if the item-spec is a root directory, it can have no extension
if (IsRootDirectory(itemSpec))
{
// NOTE: this is to prevent Path.GetExtension() from treating server and share elements in a UNC
// file-spec as filenames e.g. \\server.ext, \\server\share.ext
modifiedItemSpec = String.Empty;
}
else
{
modifiedItemSpec = Path.GetExtension(itemSpec);
}
}
else if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.RelativeDir, StringComparison.OrdinalIgnoreCase))
{
modifiedItemSpec = GetDirectory(itemSpec);
}
else if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.Directory, StringComparison.OrdinalIgnoreCase))
{
GetItemSpecModifier(currentDirectory, itemSpec, definingProjectEscaped, ItemSpecModifiers.FullPath, ref fullPath);
modifiedItemSpec = GetDirectory(fullPath);
if (NativeMethodsShared.IsWindows)
{
int length = -1;
if (FileUtilitiesRegex.StartsWithDrivePattern(modifiedItemSpec))
{
length = 2;
}
else
{
length = FileUtilitiesRegex.StartsWithUncPatternMatchLength(modifiedItemSpec);
}
if (length != -1)
{
ErrorUtilities.VerifyThrow((modifiedItemSpec.Length > length) && IsSlash(modifiedItemSpec[length]),
"Root directory must have a trailing slash.");
modifiedItemSpec = modifiedItemSpec.Substring(length + 1);
}
}
else
{
ErrorUtilities.VerifyThrow(!string.IsNullOrEmpty(modifiedItemSpec) && IsSlash(modifiedItemSpec[0]),
"Expected a full non-windows path rooted at '/'.");
// A full unix path is always rooted at
// `/`, and a root-relative path is the
// rest of the string.
modifiedItemSpec = modifiedItemSpec.Substring(1);
}
}
else if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.RecursiveDir, StringComparison.OrdinalIgnoreCase))
{
// only the BuildItem class can compute this modifier -- so leave empty
modifiedItemSpec = String.Empty;
}
else if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.Identity, StringComparison.OrdinalIgnoreCase))
{
modifiedItemSpec = itemSpec;
}
else if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.ModifiedTime, StringComparison.OrdinalIgnoreCase))
{
// About to go out to the filesystem. This means data is leaving the engine, so need
// to unescape first.
string unescapedItemSpec = EscapingUtilities.UnescapeAll(itemSpec);
FileInfo info = FileUtilities.GetFileInfoNoThrow(unescapedItemSpec);
if (info != null)
{
modifiedItemSpec = info.LastWriteTime.ToString(FileTimeFormat, null);
}
else
{
// File does not exist, or path is a directory
modifiedItemSpec = String.Empty;
}
}
else if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.CreatedTime, StringComparison.OrdinalIgnoreCase))
{
// About to go out to the filesystem. This means data is leaving the engine, so need
// to unescape first.
string unescapedItemSpec = EscapingUtilities.UnescapeAll(itemSpec);
if (FileSystems.Default.FileExists(unescapedItemSpec))
{
modifiedItemSpec = File.GetCreationTime(unescapedItemSpec).ToString(FileTimeFormat, null);
}
else
{
// File does not exist, or path is a directory
modifiedItemSpec = String.Empty;
}
}
else if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.AccessedTime, StringComparison.OrdinalIgnoreCase))
{
// About to go out to the filesystem. This means data is leaving the engine, so need
// to unescape first.
string unescapedItemSpec = EscapingUtilities.UnescapeAll(itemSpec);
if (FileSystems.Default.FileExists(unescapedItemSpec))
{
modifiedItemSpec = File.GetLastAccessTime(unescapedItemSpec).ToString(FileTimeFormat, null);
}
else
{
// File does not exist, or path is a directory
modifiedItemSpec = String.Empty;
}
}
else if (IsDefiningProjectModifier(modifier))
{
if (String.IsNullOrEmpty(definingProjectEscaped))
{
// We have nothing to work with, but that's sometimes OK -- so just return String.Empty
modifiedItemSpec = String.Empty;
}
else
{
if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.DefiningProjectDirectory, StringComparison.OrdinalIgnoreCase))
{
// ItemSpecModifiers.Directory does not contain the root directory
modifiedItemSpec = Path.Combine
(
GetItemSpecModifier(currentDirectory, definingProjectEscaped, null, ItemSpecModifiers.RootDir),
GetItemSpecModifier(currentDirectory, definingProjectEscaped, null, ItemSpecModifiers.Directory)
);
}
else
{
string additionalModifier = null;
if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.DefiningProjectFullPath, StringComparison.OrdinalIgnoreCase))
{
additionalModifier = ItemSpecModifiers.FullPath;
}
else if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.DefiningProjectName, StringComparison.OrdinalIgnoreCase))
{
additionalModifier = ItemSpecModifiers.Filename;
}
else if (string.Equals(modifier, FileUtilities.ItemSpecModifiers.DefiningProjectExtension, StringComparison.OrdinalIgnoreCase))
{
additionalModifier = ItemSpecModifiers.Extension;
}
else
{
ErrorUtilities.ThrowInternalError("\"{0}\" is not a valid item-spec modifier.", modifier);
}
modifiedItemSpec = GetItemSpecModifier(currentDirectory, definingProjectEscaped, null, additionalModifier);
}
}
}
else
{
ErrorUtilities.ThrowInternalError("\"{0}\" is not a valid item-spec modifier.", modifier);
}
}
catch (Exception e) when(ExceptionHandling.IsIoRelatedException(e))
{
ErrorUtilities.VerifyThrowInvalidOperation(false, "Shared.InvalidFilespecForTransform", modifier, itemSpec, e.Message);
}
return(modifiedItemSpec);
}