C++ nsString::CharAt方法代码示例

static PRBool
nsShouldIgnoreFile(nsString& name)
{
    PRUnichar firstChar=name.CharAt(0);
    if (firstChar == '.' || firstChar == '#' || name.CharAt(name.Length() - 1) == '~')
      return PR_TRUE;

    if (name.LowerCaseEqualsLiteral("rules.dat") || name.LowerCaseEqualsLiteral("rulesbackup.dat"))
        return PR_TRUE;


    // don't add summary files to the list of folders;
    // don't add popstate files to the list either, or rules (sort.dat).
    if (StringEndsWith(name, NS_LITERAL_STRING(".snm")) ||
        name.LowerCaseEqualsLiteral("popstate.dat") ||
        name.LowerCaseEqualsLiteral("sort.dat") ||
        name.LowerCaseEqualsLiteral("mailfilt.log") ||
        name.LowerCaseEqualsLiteral("filters.js") ||
        StringEndsWith(name, NS_LITERAL_STRING(".toc")) ||
        StringEndsWith(name, NS_LITERAL_STRING(".sbd")))
        return PR_TRUE;

    return PR_FALSE;
}

void nsEudoraCompose::ExtractCharset(nsString& str)
{
  int32_t idx = MsgFind(str, "charset=", true, 0);
  if (idx != -1) {
    str.Cut(0, idx + 8);
    idx = str.FindChar(';');
    if (idx != -1)
      str.SetLength(idx);
    str.Trim(kWhitespace);
    if ((str.CharAt(0) == '"') && (str.Length() > 2)) {
      str.SetLength(str.Length() - 1);
      str.Cut(0, 1);
      str.Trim(kWhitespace);
    }
  }
  else
    str.Truncate();
}

void nsEudoraCompose::ExtractType(nsString& str)
{
  nsString tStr;
  int32_t idx = str.FindChar(';');
  if (idx != -1)
    str.SetLength(idx);

  str.Trim(kWhitespace);

  if ((str.CharAt(0) == '"') && (str.Length() > 2)) {
    str.SetLength(str.Length() - 1);
    str.Cut(0, 1);
    str.Trim(kWhitespace);
  }

  // if multipart then ignore it since no outlook message body is ever
  // valid multipart!
  if (StringBeginsWith(str, NS_LITERAL_STRING("multipart/"), nsCaseInsensitiveStringComparator()))
    str.Truncate();
}

void nsEudoraCompose::ExtractCharset( nsString& str)
{
  nsString tStr;
  PRInt32 idx = str.Find( "charset=", PR_TRUE);
  if (idx != -1) {
    idx += 8;
    str.Right( tStr, str.Length() - idx);
    idx = tStr.FindChar( ';');
    if (idx != -1)
      tStr.Left( str, idx);
    else
      str = tStr;
    str.Trim( kWhitespace);
    if ((str.CharAt( 0) == '"') && (str.Length() > 2)) {
      str.Mid( tStr, 1, str.Length() - 2);
      str = tStr;
      str.Trim( kWhitespace);
    }
  }
  else
    str.Truncate();
}

nsresult
nsRDFParserUtils::GetQuotedAttributeValue(const nsString& aSource,
                                          const nsString& aAttribute,
                                          nsString& aValue)
{
static const char kQuote = '\"';
static const char kApostrophe = '\'';

    PRInt32 offset;
    PRInt32 endOffset = -1;
    nsresult result = NS_OK;

    offset = aSource.Find(aAttribute, 0);
    if (-1 != offset) {
        offset = aSource.FindChar('=', offset);

        PRUnichar next = aSource.CharAt(++offset);
        if (kQuote == next) {
            endOffset = aSource.FindChar(kQuote, ++offset);
        }
        else if (kApostrophe == next) {
            endOffset = aSource.FindChar(kApostrophe, ++offset);
        }

        if (-1 != endOffset) {
            aSource.Mid(aValue, offset, endOffset-offset);
        }
        else {
            // Mismatched quotes - return an error
            result = NS_ERROR_FAILURE;
        }
    }
    else {
        aValue.Truncate();
    }

    return result;
}

void nsEudoraCompose::ExtractType( nsString& str)
{
  nsString tStr;
  PRInt32 idx = str.FindChar( ';');
  if (idx != -1) {
    str.Left( tStr, idx);
    str = tStr;
  }
  str.Trim( kWhitespace);

  if ((str.CharAt( 0) == '"') && (str.Length() > 2)) {
    str.Mid( tStr, 1, str.Length() - 2);
    str = tStr;
    str.Trim( kWhitespace);
  }

  // if multipart then ignore it since no outlook message body is ever
  // valid multipart!
  if (str.Length() > 10) {
    str.Left( tStr, 10);
    if (tStr.LowerCaseEqualsLiteral("multipart/"))
      str.Truncate();
  }
}

void
mozTXTToHTMLConv::ScanHTML(nsString& aInString, uint32_t whattodo, nsString &aOutString)
{ 
  // some common variables we were recalculating
  // every time inside the for loop...
  int32_t lengthOfInString = aInString.Length();
  const char16_t * uniBuffer = aInString.get();

#ifdef DEBUG_BenB_Perf
  PRTime parsing_start = PR_IntervalNow();
#endif

  // Look for simple entities not included in a tags and scan them.
  // Skip all tags ("<[...]>") and content in an a link tag ("<a [...]</a>"),
  // comment tag ("<!--[...]-->"), style tag, script tag or head tag.
  // Unescape the rest (text between tags) and pass it to ScanTXT.
  for (int32_t i = 0; i < lengthOfInString;)
  {
    if (aInString[i] == '<')  // html tag
    {
      int32_t start = i;
      if (Substring(aInString, i + 1, 2).LowerCaseEqualsASCII("a "))
           // if a tag, skip until </a>.
           // Make sure there's a space after, not to match "abbr".
      {
        i = aInString.Find("</a>", true, i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i += 4;
      }
      else if (Substring(aInString, i + 1, 3).LowerCaseEqualsASCII("!--"))
          // if out-commended code, skip until -->
      {
        i = aInString.Find("-->", false, i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i += 3;
      }
      else if (Substring(aInString, i + 1, 5).LowerCaseEqualsASCII("style") &&
               (aInString.CharAt(i + 6) == ' ' || aInString.CharAt(i + 6) == '>'))
           // if style tag, skip until </style>
      {
        i = aInString.Find("</style>", true, i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i += 8;
      }
      else if (Substring(aInString, i + 1, 6).LowerCaseEqualsASCII("script") &&
               (aInString.CharAt(i + 7) == ' ' || aInString.CharAt(i + 7) == '>'))
           // if script tag, skip until </script>
      {
        i = aInString.Find("</script>", true, i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i += 9;
      }
      else if (Substring(aInString, i + 1, 4).LowerCaseEqualsASCII("head") &&
               (aInString.CharAt(i + 5) == ' ' || aInString.CharAt(i + 5) == '>'))
           // if head tag, skip until </head>
           // Make sure not to match <header>.
      {
        i = aInString.Find("</head>", true, i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i += 7;
      }
      else  // just skip tag (attributes etc.)
      {
        i = aInString.FindChar('>', i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i++;
      }
      aOutString.Append(&uniBuffer[start], i - start);
    }
    else
    {
      uint32_t start = uint32_t(i);
      i = aInString.FindChar('<', i);
      if (i == kNotFound)
        i = lengthOfInString;
  
      nsString tempString;     
      tempString.SetCapacity(uint32_t((uint32_t(i) - start) * growthRate));
      UnescapeStr(uniBuffer, start, uint32_t(i) - start, tempString);
      ScanTXT(tempString.get(), tempString.Length(), whattodo, aOutString);
    }
  }

#ifdef DEBUG_BenB_Perf
  printf("ScanHTML time:    %d ms\n", PR_IntervalToMilliseconds(PR_IntervalNow() - parsing_start));
#endif
}