internal FileStreamContentProvider(PlatformAdaptationLayer pal, string path)
{
Assert.NotNull(pal, path);
_path = path;
_pal = new PALHolder(pal);
}
private static void SetCurrentDirectory(PlatformAdaptationLayer/*!*/ pal, string/*!*/ dir) {
try {
// TODO: MRI calls Win32 API SetCurrentDirctory directly, while BCL normalizes the path first.
pal.CurrentDirectory = dir;
} catch (Exception e) {
throw ToRubyException(e, dir, DirectoryOperation.ChangeDir);
}
}
/*!*/
public static IEnumerable<string> GetMatches(PlatformAdaptationLayer/*!*/ pal, string/*!*/ pattern, int flags)
{
if (pattern.Length == 0) {
yield break;
}
bool noEscape = ((flags & Constants.FNM_NOESCAPE) != 0);
string[] groups = UngroupGlobs(pattern, noEscape);
if (groups.Length == 0) {
yield break;
}
foreach (string group in groups) {
GlobMatcher matcher = new GlobMatcher(pal, group, flags);
foreach (string filename in matcher.DoGlob()) {
yield return filename;
}
}
}
private static void GetExecutable(PlatformAdaptationLayer/*!*/ pal, string/*!*/ command, out string executable, out string arguments) {
command = command.Trim(' ');
if (command.Length == 0) {
throw RubyExceptions.CreateEINVAL(command);
}
// This seems to be quite complicated:
// 1) If the first part of the command is a shell command (DIR, ECHO, ...) or
// if the command contains unquoted <, > or | then
// it uses ENV['COMSPEC'] to execute the command: %COMSPEC% /c "COMMAND"
// 2) It looks for the shortest prefix of command that is separated by space from the rest of the command that is either
// a) An absolute path to an executable file.
// b) Try prepend paths from ENV['PATH']
// c) Try Environment.SpecialFolder.System.
// d) Try SHGetFolderPath(CSIDL_WINDOWS) - we can't get this from Environment.SpecialFolder, so we need to use
// ENV["SystemRoot"] environment variable.
// In each step it tries to append ".exe" or ".com" extension if the path doesn't exist.
//
// For example, if the command is `x/a b/x` and the directory structure is
// x\a b\x.exe
// x\a.exe
// it executes a.exe.
//
// MRI probably calls CreateProcess Win32 API with lpApplicationName it resolves as described above and
// lpCommandLine == command. System.Diagnostics.Process also uses this API with lpApplicationName == NULL and
// lpCommandLine == '"{ProcessStartInfo.FileName}" {ProcessStartInfo.Arguments}'.
//
// Although CreateProcess does all the searching for an executable if passed no lpApplicationName,
// we need to do it ourselves because it is slightly different in MRI (is that a bug?) and also because System.Diagnostics.Process
// quotes the FileName :(
//
string comspec = pal.GetEnvironmentVariable("COMSPEC");
if (!pal.FileExists(comspec)) {
comspec = null;
}
if (comspec != null && IndexOfUnquotedSpecialCharacter(command) >= 0) {
executable = comspec;
arguments = "/c \"" + command + "\"";
return;
}
int start = 0;
while (true) {
int next = command.IndexOf(' ', start);
executable = (next >= 0) ? command.Substring(0, next) : command;
arguments = (next >= 0) ? command.Substring(next + 1) : "";
if (start == 0 && comspec != null && IsShellCommand(executable)) {
executable = comspec;
arguments = "/c \"" + command + "\"";
return;
}
try {
foreach (var path in GetExecutableFiles(pal, executable)) {
if (pal.FileExists(path)) {
// We need to set the path we found as executable. Althought makes command line of the target process
// different from when called by MRI it will execute the right process. If we passed the original executable name
// CreateProcess might resolve it to a different executable.
executable = path;
return;
}
}
} catch (Exception e) {
if (next < 0) {
throw RubyExceptions.CreateENOENT(command, e);
}
}
if (next < 0) {
throw RubyExceptions.CreateENOENT(command);
}
start = next + 1;
while (start < command.Length && command[start] == ' ') {
start++;
}
}
}
private static IEnumerable<string>/*!*/ GetAbsolutePaths(PlatformAdaptationLayer/*!*/ pal, string/*!*/ path) {
if (pal.IsAbsolutePath(path)) {
yield return path;
} else {
yield return pal.GetFullPath(path);
string var = pal.GetEnvironmentVariable("PATH");
if (!String.IsNullOrEmpty(var)) {
foreach (var prefix in var.Split(Path.PathSeparator)) {
if (prefix.Length > 0) {
yield return Path.Combine(prefix, path);
}
}
}
var = Environment.GetFolderPath(Environment.SpecialFolder.System);
if (!String.IsNullOrEmpty(var)) {
yield return Path.Combine(var, path);
}
var = pal.GetEnvironmentVariable("SystemRoot");
if (!String.IsNullOrEmpty(var)) {
yield return Path.Combine(var, path);
}
}
}
private static IEnumerable<string>/*!*/ GetExecutableFiles(PlatformAdaptationLayer/*!*/ pal, string/*!*/ path) {
if (path[0] == '"' || path[path.Length - 1] == '"') {
if (path.Length >= 3 && path[0] == '"' && path[path.Length - 1] == '"') {
path = path.Substring(1, path.Length - 2);
} else {
yield break;
}
}
string extension = Path.GetExtension(path);
bool hasExtension = !String.IsNullOrEmpty(extension);
bool isExecutable = hasExtension && Array.IndexOf(_ExecutableExtensions, extension.ToLowerInvariant()) >= 0;
if (!hasExtension || isExecutable) {
foreach (var fullPath in GetAbsolutePaths(pal, path)) {
if (hasExtension) {
yield return fullPath;
} else {
foreach (var ext in _ExecutableExtensions) {
yield return fullPath + ext;
}
}
}
}
}
internal PALHolder(PlatformAdaptationLayer pal)
{
_pal = pal;
}
private static Stream OpenFile(CodeContext context, PlatformAdaptationLayer pal, string name, FileMode fileMode, FileAccess fileAccess, FileShare fileShare) {
try {
return pal.OpenInputFileStream(name, fileMode, fileAccess, fileShare);
} catch (UnauthorizedAccessException e) {
throw PythonFile.ToIoException(context, name, e);
} catch (IOException e) {
PythonFile.AddFilename(context, name, e);
throw e;
}
}
internal GlobMatcher(PlatformAdaptationLayer/*!*/ pal, string/*!*/ pattern, int flags) {
_pal = pal;
_pattern = (pattern == "**") ? "*" : pattern;
_flags = flags | Constants.FNM_CASEFOLD;
_result = new List<string>();
_dirOnly = _pattern.LastCharacter() == '/';
_stripTwo = false;
}
public CassettePlatformAdaptationLayer(PlatformAdaptationLayer innerPal, Func<IDirectory> getDirectory)
{
this.innerPal = innerPal;
this.getDirectory = getDirectory;
}
private static IList<string>/*!*/ DoGlob(PlatformAdaptationLayer/*!*/ pal, string/*!*/ pattern, int flags) {
GlobMatcher matcher = new GlobMatcher(pal, pattern, flags);
return matcher.DoGlob();
}
internal PALHolder(PlatformAdaptationLayer pal) {
_pal = pal;
}
private static object ChangeDirectory(PlatformAdaptationLayer/*!*/ pal, string/*!*/ strDir, MutableString/*!*/ dir, BlockParam block) {
if (block == null) {
SetCurrentDirectory(pal, strDir);
return 0;
}
string current = pal.CurrentDirectory;
try {
SetCurrentDirectory(pal, strDir);
object result;
block.Yield(dir, out result);
return result;
} finally {
SetCurrentDirectory(pal, current);
}
}
private static Stream OpenFile(PlatformAdaptationLayer pal, string name, FileMode fileMode, FileAccess fileAccess, FileShare fileShare) {
if (pal.DirectoryExists(name)) {
// TODO: properly set errno
throw PythonOps.IOError("[Errno 13] Permission denied");
}
return pal.OpenInputFileStream(name, fileMode, fileAccess, fileShare);
}