C++ nsString::Cut方法代码示例

static void EscapeAmpersands(nsString& aToolTip)
{
  // First, check to see whether we have any ampersands.
  int32_t pos = aToolTip.FindChar('&');
  if (pos == kNotFound)
    return;

  // Next, see if we only have bare ampersands.
  pos = MsgFind(aToolTip, "&&", false, pos);

  // Windows tooltip code removes one ampersand from each run,
  // then collapses pairs of amperands. This means that in the easy case,
  // we need to replace each ampersand with three.
  MsgReplaceSubstring(aToolTip, NS_LITERAL_STRING("&"), NS_LITERAL_STRING("&&&"));
  if (pos == kNotFound)
    return;

  // We inserted too many ampersands. Remove some.
  for (;;) {
    pos = MsgFind(aToolTip, "&&&&&&", false, pos);
    if (pos == kNotFound)
      return;

    aToolTip.Cut(pos, 1);
    pos += 2;
  }
}

// The driver ID is a string like PCI\VEN_15AD&DEV_0405&SUBSYS_040515AD, possibly
// followed by &REV_XXXX.  We uppercase the string, and strip the &REV_ part
// from it, if found.
static void normalizeDriverId(nsString& driverid) {
  ToUpperCase(driverid);
  PRInt32 rev = driverid.Find(NS_LITERAL_CSTRING("&REV_"));
  if (rev != -1) {
    driverid.Cut(rev, driverid.Length());
  }
}

static void
ParseAlignAttribute(nsString& aValue, eAlign& aAlign, PRInt32& aRowIndex)
{
  // by default, the table is centered about the axis
  aRowIndex = 0;
  aAlign = eAlign_axis;
  PRInt32 len = 0;
  if (0 == aValue.Find("top")) {
    len = 3; // 3 is the length of 'top'
    aAlign = eAlign_top;
  }
  else if (0 == aValue.Find("bottom")) {
    len = 6; // 6 is the length of 'bottom'
    aAlign = eAlign_bottom;
  }
  else if (0 == aValue.Find("center")) {
    len = 6; // 6 is the length of 'center'
    aAlign = eAlign_center;
  }
  else if (0 == aValue.Find("baseline")) {
    len = 8; // 8 is the length of 'baseline'
    aAlign = eAlign_baseline;
  }
  else if (0 == aValue.Find("axis")) {
    len = 4; // 4 is the length of 'axis'
    aAlign = eAlign_axis;
  }
  if (len) {
    PRInt32 error;
    aValue.Cut(0, len); // aValue is not a const here
    aRowIndex = aValue.ToInteger(&error);
    if (error)
      aRowIndex = 0;
  }
}

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();
}

// EscapeStr takes the passed in string and
// escapes it IN PLACE.
void
mozTXTToHTMLConv::EscapeStr(nsString& aInString, bool inAttribute)
{
  // the replace substring routines
  // don't seem to work if you have a character
  // in the in string that is also in the replacement
  // string! =(
  //aInString.ReplaceSubstring("&", "&");
  //aInString.ReplaceSubstring("<", "&lt;");
  //aInString.ReplaceSubstring(">", "&gt;");
  for (uint32_t i = 0; i < aInString.Length();)
  {
    switch (aInString[i])
    {
    case '<':
      aInString.Cut(i, 1);
      aInString.Insert(NS_LITERAL_STRING("&lt;"), i);
      i += 4; // skip past the integers we just added
      break;
    case '>':
      aInString.Cut(i, 1);
      aInString.Insert(NS_LITERAL_STRING("&gt;"), i);
      i += 4; // skip past the integers we just added
      break;
    case '&':
      aInString.Cut(i, 1);
      aInString.Insert(NS_LITERAL_STRING("&amp;"), i);
      i += 5; // skip past the integers we just added
      break;
    case '"':
      if (inAttribute)
      {
        aInString.Cut(i, 1);
        aInString.Insert(NS_LITERAL_STRING("&quot;"), i);
        i += 6;
        break;
      }
      // else fall through
      MOZ_FALLTHROUGH;
    default:
      i++;
    }
  }
}

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();
}

static void
ParseAlignAttribute(nsString& aValue, eAlign& aAlign, int32_t& aRowIndex)
{
  // by default, the table is centered about the axis
  aRowIndex = 0;
  aAlign = eAlign_axis;
  int32_t len = 0;

  // we only have to remove the leading spaces because 
  // ToInteger ignores the whitespaces around the number
  aValue.CompressWhitespace(true, false);

  if (0 == aValue.Find("top")) {
    len = 3; // 3 is the length of 'top'
    aAlign = eAlign_top;
  }
  else if (0 == aValue.Find("bottom")) {
    len = 6; // 6 is the length of 'bottom'
    aAlign = eAlign_bottom;
  }
  else if (0 == aValue.Find("center")) {
    len = 6; // 6 is the length of 'center'
    aAlign = eAlign_center;
  }
  else if (0 == aValue.Find("baseline")) {
    len = 8; // 8 is the length of 'baseline'
    aAlign = eAlign_baseline;
  }
  else if (0 == aValue.Find("axis")) {
    len = 4; // 4 is the length of 'axis'
    aAlign = eAlign_axis;
  }
  if (len) {
    nsresult error;
    aValue.Cut(0, len); // aValue is not a const here
    aRowIndex = aValue.ToInteger(&error);
    if (NS_FAILED(error))
      aRowIndex = 0;
  }
}

// Strip the windows host process bootstrap executable rundll32.exe
// from a handler's command string if it exists.
static void StripRundll32(nsString& aCommandString)
{
  // Example rundll formats:
  // C:\Windows\System32\rundll32.exe "path to dll"
  // rundll32.exe "path to dll"
  // C:\Windows\System32\rundll32.exe "path to dll", var var
  // rundll32.exe "path to dll", var var

  NS_NAMED_LITERAL_STRING(rundllSegment, "rundll32.exe ");
  NS_NAMED_LITERAL_STRING(rundllSegmentShort, "rundll32 ");

  // case insensitive
  int32_t strLen = rundllSegment.Length();
  int32_t index = aCommandString.Find(rundllSegment, true);
  if (index == kNotFound) {
    strLen = rundllSegmentShort.Length();
    index = aCommandString.Find(rundllSegmentShort, true);
  }

  if (index != kNotFound) {
    uint32_t rundllSegmentLength = index + strLen;
    aCommandString.Cut(0, rundllSegmentLength);
  }
}

// static
void
nsTextEditRules::HandleNewLines(nsString &aString,
                                PRInt32 aNewlineHandling)
{
  if (aNewlineHandling < 0) {
    PRInt32 caretStyle;
    nsPlaintextEditor::GetDefaultEditorPrefs(aNewlineHandling, caretStyle);
  }

  switch(aNewlineHandling)
  {
  case nsIPlaintextEditor::eNewlinesReplaceWithSpaces:
    // Strip trailing newlines first so we don't wind up with trailing spaces
    aString.Trim(CRLF, false, true);
    aString.ReplaceChar(CRLF, ' ');
    break;
  case nsIPlaintextEditor::eNewlinesStrip:
    aString.StripChars(CRLF);
    break;
  case nsIPlaintextEditor::eNewlinesPasteToFirst:
  default:
    {
      PRInt32 firstCRLF = aString.FindCharInSet(CRLF);

      // we get first *non-empty* line.
      PRInt32 offset = 0;
      while (firstCRLF == offset)
      {
        offset++;
        firstCRLF = aString.FindCharInSet(CRLF, offset);
      }
      if (firstCRLF > 0)
        aString.Truncate(firstCRLF);
      if (offset > 0)
        aString.Cut(0, offset);
    }
    break;
  case nsIPlaintextEditor::eNewlinesReplaceWithCommas:
    aString.Trim(CRLF, true, true);
    aString.ReplaceChar(CRLF, ',');
    break;
  case nsIPlaintextEditor::eNewlinesStripSurroundingWhitespace:
    {
      // find each newline, and strip all the whitespace before
      // and after it
      PRInt32 firstCRLF = aString.FindCharInSet(CRLF);
      while (firstCRLF >= 0)
      {
        PRUint32 wsBegin = firstCRLF, wsEnd = firstCRLF + 1;
        // look backwards for the first non-whitespace char
        while (wsBegin > 0 && NS_IS_SPACE(aString[wsBegin - 1]))
          --wsBegin;
        while (wsEnd < aString.Length() && NS_IS_SPACE(aString[wsEnd]))
          ++wsEnd;
        // now cut this range out of the string
        aString.Cut(wsBegin, wsEnd - wsBegin);
        // look for another CR or LF
        firstCRLF = aString.FindCharInSet(CRLF);
      }
    }
    break;
  case nsIPlaintextEditor::eNewlinesPasteIntact:
    // even if we're pasting newlines, don't paste leading/trailing ones
    aString.Trim(CRLF, true, true);
    break;
  }
}

// static
void
nsTextEditRules::HandleNewLines(nsString &aString,
                                int32_t aNewlineHandling)
{
  if (aNewlineHandling < 0) {
    int32_t caretStyle;
    nsPlaintextEditor::GetDefaultEditorPrefs(aNewlineHandling, caretStyle);
  }

  switch(aNewlineHandling)
  {
  case nsIPlaintextEditor::eNewlinesReplaceWithSpaces:
    // Strip trailing newlines first so we don't wind up with trailing spaces
    aString.Trim(CRLF, false, true);
    aString.ReplaceChar(CRLF, ' ');
    break;
  case nsIPlaintextEditor::eNewlinesStrip:
    aString.StripChars(CRLF);
    break;
  case nsIPlaintextEditor::eNewlinesPasteToFirst:
  default:
    {
      int32_t firstCRLF = aString.FindCharInSet(CRLF);

      // we get first *non-empty* line.
      int32_t offset = 0;
      while (firstCRLF == offset)
      {
        offset++;
        firstCRLF = aString.FindCharInSet(CRLF, offset);
      }
      if (firstCRLF > 0)
        aString.Truncate(firstCRLF);
      if (offset > 0)
        aString.Cut(0, offset);
    }
    break;
  case nsIPlaintextEditor::eNewlinesReplaceWithCommas:
    aString.Trim(CRLF, true, true);
    aString.ReplaceChar(CRLF, ',');
    break;
  case nsIPlaintextEditor::eNewlinesStripSurroundingWhitespace:
    {
      nsString result;
      uint32_t offset = 0;
      while (offset < aString.Length())
      {
        int32_t nextCRLF = aString.FindCharInSet(CRLF, offset);
        if (nextCRLF < 0) {
          result.Append(nsDependentSubstring(aString, offset));
          break;
        }
        uint32_t wsBegin = nextCRLF;
        // look backwards for the first non-whitespace char
        while (wsBegin > offset && NS_IS_SPACE(aString[wsBegin - 1]))
          --wsBegin;
        result.Append(nsDependentSubstring(aString, offset, wsBegin - offset));
        offset = nextCRLF + 1;
        while (offset < aString.Length() && NS_IS_SPACE(aString[offset]))
          ++offset;
      }
      aString = result;
    }
    break;
  case nsIPlaintextEditor::eNewlinesPasteIntact:
    // even if we're pasting newlines, don't paste leading/trailing ones
    aString.Trim(CRLF, true, true);
    break;
  }
}

void
mozTXTToHTMLConv::ScanTXT(const PRUnichar * aInString, PRInt32 aInStringLength, PRUint32 whattodo, nsString& aOutString)
{
  bool doURLs = 0 != (whattodo & kURLs);
  bool doGlyphSubstitution = 0 != (whattodo & kGlyphSubstitution);
  bool doStructPhrase = 0 != (whattodo & kStructPhrase);

  PRUint32 structPhrase_strong = 0;  // Number of currently open tags
  PRUint32 structPhrase_underline = 0;
  PRUint32 structPhrase_italic = 0;
  PRUint32 structPhrase_code = 0;

  nsAutoString outputHTML;  // moved here for performance increase

  for(PRUint32 i = 0; PRInt32(i) < aInStringLength;)
  {
    if (doGlyphSubstitution)
    {
      PRInt32 glyphTextLen;
      if (GlyphHit(&aInString[i], aInStringLength - i, i == 0, aOutString, glyphTextLen))
      {
        i += glyphTextLen;
        continue;
      }
    }

    if (doStructPhrase)
    {
      const PRUnichar * newOffset = aInString;
      PRInt32 newLength = aInStringLength;
      if (i > 0 ) // skip the first element?
      {
        newOffset = &aInString[i-1];
        newLength = aInStringLength - i + 1;
      }

      switch (aInString[i]) // Performance increase
      {
      case '*':
        if (StructPhraseHit(newOffset, newLength, i == 0,
                            NS_LITERAL_STRING("*").get(), 1,
                            "b", "class=\"moz-txt-star\"",
                            aOutString, structPhrase_strong))
        {
          i++;
          continue;
        }
        break;
      case '/':
        if (StructPhraseHit(newOffset, newLength, i == 0,
                            NS_LITERAL_STRING("/").get(), 1,
                            "i", "class=\"moz-txt-slash\"",
                            aOutString, structPhrase_italic))
        {
          i++;
          continue;
        }
        break;
      case '_':
        if (StructPhraseHit(newOffset, newLength, i == 0,
                            NS_LITERAL_STRING("_").get(), 1,
                            "span" /* <u> is deprecated */,
                            "class=\"moz-txt-underscore\"",
                            aOutString, structPhrase_underline))
        {
          i++;
          continue;
        }
        break;
      case '|':
        if (StructPhraseHit(newOffset, newLength, i == 0,
                            NS_LITERAL_STRING("|").get(), 1,
                            "code", "class=\"moz-txt-verticalline\"",
                            aOutString, structPhrase_code))
        {
          i++;
          continue;
        }
        break;
      }
    }

    if (doURLs)
    {
      switch (aInString[i])
      {
      case ':':
      case '@':
      case '.':
        if ( (i == 0 || ((i > 0) && aInString[i - 1] != ' ')) && aInString[i +1] != ' ') // Performance increase
        {
          PRInt32 replaceBefore;
          PRInt32 replaceAfter;
          if (FindURL(aInString, aInStringLength, i, whattodo,
                      outputHTML, replaceBefore, replaceAfter)
                  && structPhrase_strong + structPhrase_italic +
                       structPhrase_underline + structPhrase_code == 0
                       /* workaround for bug #19445 */ )
          {
            aOutString.Cut(aOutString.Length() - replaceBefore, replaceBefore);
//.........这里部分代码省略.........

bool nsTextAddress::GetField(const nsAString &aLine, int32_t index,
                             nsString &field, char16_t delim) {
  bool result = false;
  int32_t pos = 0;
  int32_t maxLen = aLine.Length();
  char16_t tab = char16_t('\t');
  char16_t doubleQuote = char16_t('"');

  field.Truncate();

  if (delim == tab) tab = 0;

  while (index && (pos < maxLen)) {
    while (((aLine[pos] == char16_t(' ')) || (aLine[pos] == tab)) &&
           (pos < maxLen)) {
      pos++;
    }
    if (pos >= maxLen) break;
    if (aLine[pos] == doubleQuote) {
      do {
        pos++;
        if (((pos + 1) < maxLen) && (aLine[pos] == doubleQuote) &&
            (aLine[pos + 1] == doubleQuote)) {
          pos += 2;
        }
      } while ((pos < maxLen) && (aLine[pos] != doubleQuote));
      if (pos < maxLen) pos++;
    }
    if (pos >= maxLen) break;

    while ((pos < maxLen) && (aLine[pos] != delim)) pos++;

    if (pos >= maxLen) break;

    index--;
    pos++;
  }

  if (pos >= maxLen) return result;

  result = true;

  while ((pos < maxLen) && ((aLine[pos] == ' ') || (aLine[pos] == tab))) pos++;

  int32_t fLen = 0;
  int32_t startPos = pos;
  bool quoted = false;
  if (aLine[pos] == '"') {
    startPos++;
    fLen = -1;
    do {
      pos++;
      fLen++;
      if (((pos + 1) < maxLen) && (aLine[pos] == doubleQuote) &&
          (aLine[pos + 1] == doubleQuote)) {
        quoted = true;
        pos += 2;
        fLen += 2;
      }
    } while ((pos < maxLen) && (aLine[pos] != doubleQuote));
  } else {
    while ((pos < maxLen) && (aLine[pos] != delim)) {
      pos++;
      fLen++;
    }
  }

  if (!fLen) {
    return result;
  }

  field.Append(nsDependentSubstring(aLine, startPos, fLen));
  field.Trim(kWhitespace);

  if (quoted) {
    int32_t offset = field.Find("\"\"");
    while (offset != -1) {
      field.Cut(offset, 1);
      offset = MsgFind(field, "\"\"", false, offset + 1);
    }
  }

  return result;
}

// XXX Code copied from nsHTMLContentSink. It should be shared.
void
nsRDFParserUtils::StripAndConvert(nsString& aResult)
{
    if ( !aResult.IsEmpty() ) {
      // Strip quotes if present
      PRUnichar first = aResult.First();
      if ((first == '"') || (first == '\'')) {
          if (aResult.Last() == first) {
              aResult.Cut(0, 1);
              PRInt32 pos = aResult.Length() - 1;
              if (pos >= 0) {
                  aResult.Cut(pos, 1);
              }
          } else {
              // Mismatched quotes - leave them in
          }
      }
    }

    // Reduce any entities
    // XXX Note: as coded today, this will only convert well formed
    // entities.  This may not be compatible enough.
    // XXX there is a table in navigator that translates some numeric entities
    // should we be doing that? If so then it needs to live in two places (bad)
    // so we should add a translate numeric entity method from the parser...
    char cbuf[100];
    PRUint32 i = 0;
    while (i < aResult.Length()) {
        // If we have the start of an entity (and it's not at the end of
        // our string) then translate the entity into it's unicode value.
        if ((aResult.CharAt(i++) == '&') && (i < aResult.Length())) {
            PRInt32 start = i - 1;
            PRUnichar e = aResult.CharAt(i);
            if (e == '#') {
                // Convert a numeric character reference
                i++;
                char* cp = cbuf;
                char* limit = cp + sizeof(cbuf) - 1;
                PRBool ok = PR_FALSE;
                PRUint32 slen = aResult.Length();
                while ((i < slen) && (cp < limit)) {
                    PRUnichar f = aResult.CharAt(i);
                    if (f == ';') {
                        i++;
                        ok = PR_TRUE;
                        break;
                    }
                    if ((f >= '0') && (f <= '9')) {
                        *cp++ = char(f);
                        i++;
                        continue;
                    }
                    break;
                }
                if (!ok || (cp == cbuf)) {
                    continue;
                }
                *cp = '\0';
                if (cp - cbuf > 5) {
                    continue;
                }
                PRInt32 ch = PRInt32( ::atoi(cbuf) );
                if (ch > 65535) {
                    continue;
                }

                // Remove entity from string and replace it with the integer
                // value.
                aResult.Cut(start, i - start);
                aResult.Insert(PRUnichar(ch), start);
                i = start + 1;
            }
            else if (((e >= 'A') && (e <= 'Z')) ||
                     ((e >= 'a') && (e <= 'z'))) {
                // Convert a named entity
                i++;
                char* cp = cbuf;
                char* limit = cp + sizeof(cbuf) - 1;
                *cp++ = char(e);
                PRBool ok = PR_FALSE;
                PRUint32 slen = aResult.Length();
                while ((i < slen) && (cp < limit)) {
                    PRUnichar f = aResult.CharAt(i);
                    if (f == ';') {
                        i++;
                        ok = PR_TRUE;
                        break;
                    }
                    if (((f >= '0') && (f <= '9')) ||
                        ((f >= 'A') && (f <= 'Z')) ||
                        ((f >= 'a') && (f <= 'z'))) {
                        *cp++ = char(f);
                        i++;
                        continue;
                    }
                    break;
                }
                if (!ok || (cp == cbuf)) {
                    continue;
//.........这里部分代码省略.........