FilePath: add a convertor to ASCII

base/file_path.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 
 #include "base/file_path.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
@@ skipping 502 matching lines @@
 }
 
 #if defined(OS_POSIX)
 // See file_path.h for a discussion of the encoding of paths on POSIX
 // platforms.  These encoding conversion functions are not quite correct.
 
 string16 FilePath::LossyDisplayName() const {
   return WideToUTF16(base::SysNativeMBToWide(path_));
 }
 
+std::string FilePath::MaybeAsASCII() const {
+  if (IsStringASCII(path_))
+    return path_;
+  return "";
+}
+
 // The *Hack functions are temporary while we fix the remainder of the code.
 // Remember to remove the #includes at the top when you remove these.
 
 // static
 FilePath FilePath::FromWStringHack(const std::wstring& wstring) {
   return FilePath(base::SysWideToNativeMB(wstring));
 }
 std::wstring FilePath::ToWStringHack() const {
   return base::SysNativeMBToWide(path_);
 }
 #elif defined(OS_WIN)
 string16 FilePath::LossyDisplayName() const {
   return path_;
 }
 
+std::string FilePath::MaybeAsASCII() const {
+  if (IsStringASCII(path_))
+    return WideToASCII(path_);
+  return "";
+}
+
 // static
 FilePath FilePath::FromWStringHack(const std::wstring& wstring) {
   return FilePath(wstring);
 }
 std::wstring FilePath::ToWStringHack() const {
   return path_;
 }
 #endif
 
 // static.
@@ skipping 647 matching lines @@
 
 #if defined(FILE_PATH_USES_WIN_SEPARATORS)
 FilePath FilePath::NormalizeWindowsPathSeparators() const {
   StringType copy = path_;
   for (size_t i = 1; i < arraysize(kSeparators); ++i) {
     std::replace(copy.begin(), copy.end(), kSeparators[i], kSeparators[0]);
   }
   return FilePath(copy);
 }
 #endif