Separate out some more ICU from base and into base/i18n....

base/string_util_icu.cc

-// Copyright (c) 2006-2008 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 "base/string_util.h"
-
-#include <string.h>
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/singleton.h"
-#include "unicode/numfmt.h"
-#include "unicode/ustring.h"
-
-// Number formatting -----------------------------------------------------------
-
-namespace {
-
-struct NumberFormatSingletonTraits
-    : public DefaultSingletonTraits<icu::NumberFormat> {
-  static icu::NumberFormat* New() {
-    UErrorCode status = U_ZERO_ERROR;
-    icu::NumberFormat* formatter = icu::NumberFormat::createInstance(status);
-    DCHECK(U_SUCCESS(status));
-    return formatter;
-  }
-  // There's no ICU call to destroy a NumberFormat object other than
-  // operator delete, so use the default Delete, which calls operator delete.
-  // This can cause problems if a different allocator is used by this file than
-  // by ICU.
-};
-
-}  // namespace
-
-std::wstring FormatNumber(int64 number) {
-  icu::NumberFormat* number_format =
-      Singleton<icu::NumberFormat, NumberFormatSingletonTraits>::get();
-
-  if (!number_format) {
-    // As a fallback, just return the raw number in a string.
-    return StringPrintf(L"%lld", number);
-  }
-  icu::UnicodeString ustr;
-  number_format->format(number, ustr);
-
-#if defined(WCHAR_T_IS_UTF16)
-  return std::wstring(ustr.getBuffer(),
-                      static_cast<std::wstring::size_type>(ustr.length()));
-#elif defined(WCHAR_T_IS_UTF32)
-  wchar_t buffer[64];  // A int64 is less than 20 chars long,  so 64 chars
-                       // leaves plenty of room for formating stuff.
-  int length = 0;
-  UErrorCode error = U_ZERO_ERROR;
-  u_strToWCS(buffer, 64, &length, ustr.getBuffer(), ustr.length() , &error);
-  if (U_FAILURE(error)) {
-    NOTREACHED();
-    // As a fallback, just return the raw number in a string.
-    return StringPrintf(L"%lld", number);
-  }
-  return std::wstring(buffer, static_cast<std::wstring::size_type>(length));
-#endif  // defined(WCHAR_T_IS_UTF32)
-}
-
-// Although this function isn't specific to ICU, we implemented it here so
-// that chrome.exe won't pull it in.  Moving this function to string_util.cc
-// causes chrome.exe to grow by 400k because of more ICU being pulled in.
-TrimPositions TrimWhitespaceUTF8(const std::string& input,
-                                 TrimPositions positions,
-                                 std::string* output) {
-  // This implementation is not so fast since it converts the text encoding
-  // twice. Please feel free to file a bug if this function hurts the
-  // performance of Chrome.
-  DCHECK(IsStringUTF8(input));
-  std::wstring input_wide = UTF8ToWide(input);
-  std::wstring output_wide;
-  TrimPositions result = TrimWhitespace(input_wide, positions, &output_wide);
-  *output = WideToUTF8(output_wide);
-  return result;
-}