C++ nsAString::Replace方法代码示例

NS_StringSetDataRange(nsAString& aStr,
                      uint32_t aCutOffset, uint32_t aCutLength,
                      const char16_t* aData, uint32_t aDataLength)
{
  if (aCutOffset == UINT32_MAX) {
    // append case
    if (aData) {
      aStr.Append(aData, aDataLength);
    }
    return NS_OK; // XXX report errors
  }

  if (aCutLength == UINT32_MAX) {
    aCutLength = aStr.Length() - aCutOffset;
  }

  if (aData) {
    if (aDataLength == UINT32_MAX) {
      aStr.Replace(aCutOffset, aCutLength, nsDependentString(aData));
    } else {
      aStr.Replace(aCutOffset, aCutLength, Substring(aData, aDataLength));
    }
  } else {
    aStr.Cut(aCutOffset, aCutLength);
  }

  return NS_OK; // XXX report errors
}

NS_StringSetDataRange(nsAString &aStr,
                      PRUint32 aCutOffset, PRUint32 aCutLength,
                      const PRUnichar *aData, PRUint32 aDataLength)
{
  if (aCutOffset == PR_UINT32_MAX)
  {
    // append case
    if (aData)
      aStr.Append(aData, aDataLength);
    return NS_OK; // XXX report errors
  }

  if (aCutLength == PR_UINT32_MAX)
    aCutLength = aStr.Length() - aCutOffset;

  if (aData)
  {
    if (aDataLength == PR_UINT32_MAX)
      aStr.Replace(aCutOffset, aCutLength, nsDependentString(aData));
    else
      aStr.Replace(aCutOffset, aCutLength, Substring(aData, aDataLength));
  }
  else
    aStr.Cut(aCutOffset, aCutLength);

  return NS_OK; // XXX report errors
}

void ConvertTexttoAsterisks(nsAccessibleWrap* accWrap, nsAString& aString)
{
    // convert each char to "*" when it's "password text" 
    PRUint32 atkRole = atkRoleMap[accWrap->NativeRole()];
    if (atkRole == ATK_ROLE_PASSWORD_TEXT) {
        for (PRUint32 i = 0; i < aString.Length(); i++)
            aString.Replace(i, 1, NS_LITERAL_STRING("*"));
    }
}

static void
__ReplaceChar (nsAString &string, const PRUnichar replace, const PRUnichar with)
{
  PRInt32 i = string.FindChar (replace);
  while (i >= 0) {
    string.Replace (i, 1, &with, 1);
    i = string.FindChar (replace);
  }
}

static void
ConvertTexttoAsterisks(AccessibleWrap* accWrap, nsAString& aString)
{
  // convert each char to "*" when it's "password text" 
  if (accWrap->NativeRole() == roles::PASSWORD_TEXT) {
    for (uint32_t i = 0; i < aString.Length(); i++)
      aString.Replace(i, 1, NS_LITERAL_STRING("*"));
  }
}

bool
GetIDFromMinidump(nsILocalFile* minidump, nsAString& id)
{
  if (NS_SUCCEEDED(minidump->GetLeafName(id))) {
    id.Replace(id.Length() - 4, 4, NS_LITERAL_STRING(""));
    return true;
  }
  return false;
}

/**
 * JS property navigator.language, exposed to web content.
 * Take first value from Accept-Languages (HTTP header), which is
 * the "content language" freely set by the user in the Pref window.
 *
 * Do not use UI language (chosen app locale) here.
 * See RFC 2616, Section 15.1.4 "Privacy Issues Connected to Accept Headers"
 *
 * "en", "en-US" and "i-cherokee" and "" are valid.
 * Fallback in case of invalid pref should be "" (empty string), to
 * let site do fallback, e.g. to site's local language.
 */
NS_IMETHODIMP
Navigator::GetLanguage(nsAString& aLanguage)
{
  // E.g. "de-de, en-us,en".
  const nsAdoptingString& acceptLang =
    Preferences::GetLocalizedString("intl.accept_languages");

  // Take everything before the first "," or ";", without trailing space.
  nsCharSeparatedTokenizer langTokenizer(acceptLang, ',');
  const nsSubstring &firstLangPart = langTokenizer.nextToken();
  nsCharSeparatedTokenizer qTokenizer(firstLangPart, ';');
  aLanguage.Assign(qTokenizer.nextToken());

  // Checks and fixups:
  // replace "_" with "-" to avoid POSIX/Windows "en_US" notation.
  if (aLanguage.Length() > 2 && aLanguage[2] == PRUnichar('_')) {
    aLanguage.Replace(2, 1, PRUnichar('-')); // TODO replace all
  }

  // Use uppercase for country part, e.g. "en-US", not "en-us", see BCP47
  // only uppercase 2-letter country codes, not "zh-Hant", "de-DE-x-goethe".
  if (aLanguage.Length() <= 2) {
    return NS_OK;
  }

  nsCharSeparatedTokenizer localeTokenizer(aLanguage, '-');
  int32_t pos = 0;
  bool first = true;
  while (localeTokenizer.hasMoreTokens()) {
    const nsSubstring& code = localeTokenizer.nextToken();

    if (code.Length() == 2 && !first) {
      nsAutoString upper(code);
      ToUpperCase(upper);
      aLanguage.Replace(pos, code.Length(), upper);
    }

    pos += code.Length() + 1; // 1 is the separator
    first = false;
  }

  return NS_OK;
}

void nsIDNService::normalizeFullStops(nsAString& s)
{
  nsAString::const_iterator start, end;
  s.BeginReading(start); 
  s.EndReading(end); 
  int32_t index = 0;

  while (start != end) {
    switch (*start) {
      case 0x3002:
      case 0xFF0E:
      case 0xFF61:
        s.Replace(index, 1, NS_LITERAL_STRING("."));
        break;
      default:
        break;
    }
    start++;
    index++;
  }
}

/** ---------------------------------------------------
 *  Helper function - Returns either the name or sets the length to zero
 */
static nsresult 
GetAdjustedPrinterName(nsIPrintSettings* aPS, bool aUsePNP,
                       nsAString& aPrinterName)
{
  NS_ENSURE_ARG_POINTER(aPS);

  aPrinterName.Truncate();
  if (!aUsePNP)
    return NS_OK;

  // Get the Printer Name from the PrintSettings 
  // to use as a prefix for Pref Names
  char16_t* prtName = nullptr;

  nsresult rv = aPS->GetPrinterName(&prtName);
  NS_ENSURE_SUCCESS(rv, rv);

  aPrinterName = nsDependentString(prtName);

  // Convert any whitespaces, carriage returns or newlines to _
  // The below algorithm is supposedly faster than using iterators
  NS_NAMED_LITERAL_STRING(replSubstr, "_");
  const char* replaceStr = " \n\r";

  int32_t x;
  for (x=0; x < (int32_t)strlen(replaceStr); x++) {
    char16_t uChar = replaceStr[x];

    int32_t i = 0;
    while ((i = aPrinterName.FindChar(uChar, i)) != kNotFound) {
      aPrinterName.Replace(i, 1, replSubstr);
      i++;
    }
  }
  return NS_OK;
}

static bool
GetCurrentWorkingDirectory(nsAString& workingDirectory)
{
#if !defined(XP_WIN) && !defined(XP_UNIX)
    //XXX: your platform should really implement this
    return false;
#elif XP_WIN
    DWORD requiredLength = GetCurrentDirectoryW(0, nullptr);
    workingDirectory.SetLength(requiredLength);
    GetCurrentDirectoryW(workingDirectory.Length(),
                         (LPWSTR)workingDirectory.BeginWriting());
    // we got a trailing null there
    workingDirectory.SetLength(requiredLength);
    workingDirectory.Replace(workingDirectory.Length() - 1, 1, L'\\');
#elif defined(XP_UNIX)
    nsAutoCString cwd;
    // 1024 is just a guess at a sane starting value
    size_t bufsize = 1024;
    char* result = nullptr;
    while (result == nullptr) {
        cwd.SetLength(bufsize);
        result = getcwd(cwd.BeginWriting(), cwd.Length());
        if (!result) {
            if (errno != ERANGE)
                return false;
            // need to make the buffer bigger
            bufsize *= 2;
        }
    }
    // size back down to the actual string length
    cwd.SetLength(strlen(result) + 1);
    cwd.Replace(cwd.Length() - 1, 1, '/');
    workingDirectory = NS_ConvertUTF8toUTF16(cwd);
#endif
    return true;
}

//.........这里部分代码省略.........
      // has a ":" that can't be escaped and (b) all pseudo-elements at
      // this point are known, and therefore we know they don't need
      // escaping.
      aString.Append(tag);
    } else {
      nsStyleUtil::AppendEscapedCSSIdent(tag, aString);
    }
  }

  // Append the id, if there is one
  if (mIDList) {
    nsAtomList* list = mIDList;
    while (list != nsnull) {
      list->mAtom->ToString(temp);
      aString.Append(PRUnichar('#'));
      nsStyleUtil::AppendEscapedCSSIdent(temp, aString);
      list = list->mNext;
    }
  }

  // Append each class in the linked list
  if (mClassList) {
    if (isPseudoElement) {
#ifdef MOZ_XUL
      NS_ABORT_IF_FALSE(nsCSSAnonBoxes::IsTreePseudoElement(mLowercaseTag),
                        "must be tree pseudo-element");

      aString.Append(PRUnichar('('));
      for (nsAtomList* list = mClassList; list; list = list->mNext) {
        nsStyleUtil::AppendEscapedCSSIdent(nsDependentAtomString(list->mAtom), aString);
        aString.Append(PRUnichar(','));
      }
      // replace the final comma with a close-paren
      aString.Replace(aString.Length() - 1, 1, PRUnichar(')'));
#else
      NS_ERROR("Can't happen");
#endif
    } else {
      nsAtomList* list = mClassList;
      while (list != nsnull) {
        list->mAtom->ToString(temp);
        aString.Append(PRUnichar('.'));
        nsStyleUtil::AppendEscapedCSSIdent(temp, aString);
        list = list->mNext;
      }
    }
  }

  // Append each attribute selector in the linked list
  if (mAttrList) {
    nsAttrSelector* list = mAttrList;
    while (list != nsnull) {
      aString.Append(PRUnichar('['));
      // Append the namespace prefix
      if (list->mNameSpace == kNameSpaceID_Unknown) {
        aString.Append(PRUnichar('*'));
        aString.Append(PRUnichar('|'));
      } else if (list->mNameSpace != kNameSpaceID_None) {
        if (aSheet) {
          nsXMLNameSpaceMap *sheetNS = aSheet->GetNameSpaceMap();
          nsIAtom *prefixAtom = sheetNS->FindPrefix(list->mNameSpace);
          // Default namespaces don't apply to attribute selectors, so
          // we must have a useful prefix.
          NS_ASSERTION(prefixAtom,
                       "How did we end up with a namespace if the prefix "
                       "is unknown?");

/**
 * Windows API includes regional preferences from the user only
 * if we pass empty locale string or if the locale string matches
 * the current locale.
 *
 * Since Windows API only allows us to retrieve two options - short/long
 * we map it to our four options as:
 *
 *   short  -> short
 *   medium -> short
 *   long   -> long
 *   full   -> long
 *
 * In order to produce a single date/time format, we use CLDR pattern
 * for combined date/time string, since Windows API does not provide an
 * option for this.
 */
bool
OSPreferences::ReadDateTimePattern(DateTimeFormatStyle aDateStyle,
                                   DateTimeFormatStyle aTimeStyle,
                                   const nsACString& aLocale, nsAString& aRetVal)
{
  WCHAR buffer[LOCALE_NAME_MAX_LENGTH];

  LPWSTR localeName = GetWindowsLocaleFor(aLocale, buffer);

  bool isDate = aDateStyle != DateTimeFormatStyle::None &&
                aDateStyle != DateTimeFormatStyle::Invalid;
  bool isTime = aTimeStyle != DateTimeFormatStyle::None &&
                aTimeStyle != DateTimeFormatStyle::Invalid;

  // If both date and time are wanted, we'll initially read them into a
  // local string, and then insert them into the overall date+time pattern;
  // but if only one is needed we'll work directly with the return value.
  // Set 'str' to point to the string we will use to retrieve patterns
  // from Windows.
  nsAutoString tmpStr;
  nsAString* str;
  if (isDate && isTime) {
    if (!GetDateTimeConnectorPattern(NS_ConvertUTF16toUTF8(localeName), aRetVal)) {
      NS_WARNING("failed to get date/time connector");
      aRetVal.AssignLiteral(u"{1} {0}");
    }
    str = &tmpStr;
  } else if (isDate || isTime) {
    str = &aRetVal;
  } else {
    aRetVal.Truncate(0);
    return true;
  }

  if (isDate) {
    LCTYPE lcType = ToDateLCType(aDateStyle);
    size_t len = GetLocaleInfoEx(localeName, lcType, nullptr, 0);
    if (len == 0) {
      return false;
    }

    // We're doing it to ensure the terminator will fit when Windows writes the data
    // to its output buffer. See bug 1358159 for details.
    str->SetLength(len);
    GetLocaleInfoEx(localeName, lcType, (WCHAR*)str->BeginWriting(), len);
    str->SetLength(len - 1); // -1 because len counts the null terminator

    // Windows uses "ddd" and "dddd" for abbreviated and full day names respectively,
    //   https://msdn.microsoft.com/en-us/library/windows/desktop/dd317787(v=vs.85).aspx
    // but in a CLDR/ICU-style pattern these should be "EEE" and "EEEE".
    //   http://userguide.icu-project.org/formatparse/datetime
    // So we fix that up here.
    nsAString::const_iterator start, pos, end;
    start = str->BeginReading(pos);
    str->EndReading(end);
    if (FindInReadable(NS_LITERAL_STRING("dddd"), pos, end)) {
      str->Replace(pos - start, 4, NS_LITERAL_STRING("EEEE"));
    } else if (FindInReadable(NS_LITERAL_STRING("ddd"), pos, end)) {
      str->Replace(pos - start, 3, NS_LITERAL_STRING("EEE"));
    }

    // Also, Windows uses lowercase "g" or "gg" for era, but ICU wants uppercase "G"
    // (it would interpret "g" as "modified Julian day"!). So fix that.
    int32_t index = str->FindChar('g');
    if (index >= 0) {
      str->Replace(index, 1, 'G');
      // If it was a double "gg", just drop the second one.
      index++;
      if (str->CharAt(index) == 'g') {
        str->Cut(index, 1);
      }
    }

    // If time was also requested, we need to substitute the date pattern from Windows
    // into the date+time format that we have in aRetVal.
    if (isTime) {
      nsAString::const_iterator start, pos, end;
      start = aRetVal.BeginReading(pos);
      aRetVal.EndReading(end);
      if (FindInReadable(NS_LITERAL_STRING("{1}"), pos, end)) {
        aRetVal.Replace(pos - start, 3, tmpStr);
      }
    }
//.........这里部分代码省略.........