C++ nsAString::First方法代码示例

nsresult
nsXULContentUtils::GetResource(int32_t aNameSpaceID, const nsAString& aAttribute, nsIRDFResource** aResult)
{
    // construct a fully-qualified URI from the namespace/tag pair.

    // XXX should we allow nodes with no namespace???
    //NS_PRECONDITION(aNameSpaceID != kNameSpaceID_Unknown, "no namespace");
    //if (aNameSpaceID == kNameSpaceID_Unknown)
    //    return NS_ERROR_UNEXPECTED;

    nsresult rv;

    char16_t buf[256];
    nsFixedString uri(buf, ArrayLength(buf), 0);
    if (aNameSpaceID != kNameSpaceID_Unknown && aNameSpaceID != kNameSpaceID_None) {
        rv = nsContentUtils::NameSpaceManager()->GetNameSpaceURI(aNameSpaceID, uri);
        // XXX ignore failure; treat as "no namespace"
    }

    // XXX check to see if we need to insert a '/' or a '#'. Oy.
    if (!uri.IsEmpty()  && uri.Last() != '#' && uri.Last() != '/' && aAttribute.First() != '#')
        uri.Append(char16_t('#'));

    uri.Append(aAttribute);

    rv = gRDF->GetUnicodeResource(uri, aResult);
    NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get resource");
    if (NS_FAILED(rv)) return rv;

    return NS_OK;
}

bool
nsMsgLocalStoreUtils::nsShouldIgnoreFile(nsAString& name)
{
  PRUnichar firstChar = name.First();
  if (firstChar == '.' || firstChar == '#' ||
      name.CharAt(name.Length() - 1) == '~')
    return true;

  if (name.LowerCaseEqualsLiteral("msgfilterrules.dat") ||
      name.LowerCaseEqualsLiteral("rules.dat") ||
      name.LowerCaseEqualsLiteral("filterlog.html") ||
      name.LowerCaseEqualsLiteral("junklog.html") ||
      name.LowerCaseEqualsLiteral("rulesbackup.dat"))
    return 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")))
    return true;

  // ignore RSS data source files
  if (name.LowerCaseEqualsLiteral("feeds.rdf") ||
      name.LowerCaseEqualsLiteral("feeditems.rdf"))
    return true;

  // The .mozmsgs dir is for spotlight support
    return (StringEndsWith(name, NS_LITERAL_STRING(".mozmsgs")) ||
            StringEndsWith(name, NS_LITERAL_STRING(".sbd")) ||
            StringEndsWith(name, NS_LITERAL_STRING(SUMMARY_SUFFIX)));
}

    bool HostIsAllowed(nsAString& host)
    {
      if (host.First() == '*') {
        if (host.EqualsLiteral("*") || host[1] != '.') {
          return false;
        }

        host.Cut(0, 2);

        nsCOMPtr<nsIEffectiveTLDService> tldService =
          do_GetService(NS_EFFECTIVETLDSERVICE_CONTRACTID);

        if (!tldService) {
          return false;
        }

        NS_ConvertUTF16toUTF8 cHost(host);
        nsAutoCString publicSuffix;

        nsresult rv = tldService->GetPublicSuffixFromHost(cHost, publicSuffix);

        return NS_SUCCEEDED(rv) && !cHost.Equals(publicSuffix);
      }

      return true;
    };

/* static */ bool
FileSystemUtils::IsValidRelativeDOMPath(const nsAString& aPath,
                                        nsTArray<nsString>& aParts)
{
  // We don't allow empty relative path to access the root.
  if (aPath.IsEmpty()) {
    return false;
  }

  // Leading and trailing "/" are not allowed.
  if (aPath.First() == FILESYSTEM_DOM_PATH_SEPARATOR_CHAR ||
      aPath.Last() == FILESYSTEM_DOM_PATH_SEPARATOR_CHAR) {
    return false;
  }

  NS_NAMED_LITERAL_STRING(kCurrentDir, ".");
  NS_NAMED_LITERAL_STRING(kParentDir, "..");

  // Split path and check each path component.
  nsCharSeparatedTokenizerTemplate<TokenizerIgnoreNothing>
    tokenizer(aPath, FILESYSTEM_DOM_PATH_SEPARATOR_CHAR);

  while (tokenizer.hasMoreTokens()) {
    nsDependentSubstring pathComponent = tokenizer.nextToken();
    // The path containing empty components, such as "foo//bar", is invalid.
    // We don't allow paths, such as "../foo", "foo/./bar" and "foo/../bar",
    // to walk up the directory.
    if (pathComponent.IsEmpty() ||
        pathComponent.Equals(kCurrentDir) ||
        pathComponent.Equals(kParentDir)) {
      return false;
    }

    aParts.AppendElement(pathComponent);
  }

  return true;
}

NS_IMETHODIMP
nsHTMLURIRefObject::GetNextURI(nsAString & aURI)
{
  NS_ENSURE_TRUE(mNode, NS_ERROR_NOT_INITIALIZED);

  nsAutoString tagName;
  nsresult rv = mNode->GetNodeName(tagName);
  NS_ENSURE_SUCCESS(rv, rv);

  // Loop over attribute list:
  if (!mAttributes)
  {
    nsCOMPtr<nsIDOMElement> element (do_QueryInterface(mNode));
    NS_ENSURE_TRUE(element, NS_ERROR_INVALID_ARG);

    mCurAttrIndex = 0;
    element->GetAttributes(getter_AddRefs(mAttributes));
    NS_ENSURE_TRUE(mAttributes, NS_ERROR_NOT_INITIALIZED);

    rv = mAttributes->GetLength(&mAttributeCnt);
    NS_ENSURE_SUCCESS(rv, rv);
    NS_ENSURE_TRUE(mAttributeCnt, NS_ERROR_FAILURE);
    mCurAttrIndex = 0;
  }

  while (mCurAttrIndex < mAttributeCnt)
  {
    nsCOMPtr<nsIDOMAttr> attrNode;
    rv = mAttributes->Item(mCurAttrIndex++, getter_AddRefs(attrNode));
    NS_ENSURE_SUCCESS(rv, rv);
    NS_ENSURE_ARG_POINTER(attrNode);
    nsString curAttr;
    rv = attrNode->GetName(curAttr);
    NS_ENSURE_SUCCESS(rv, rv);

    // href >> A, AREA, BASE, LINK
    if (MATCHES(curAttr, "href"))
    {
      if (!MATCHES(tagName, "a") && !MATCHES(tagName, "area")
          && !MATCHES(tagName, "base") && !MATCHES(tagName, "link"))
        continue;
      rv = attrNode->GetValue(aURI);
      NS_ENSURE_SUCCESS(rv, rv);
      nsString uri (aURI);
      // href pointing to a named anchor doesn't count
      if (aURI.First() != char16_t('#'))
        return NS_OK;
      aURI.Truncate();
      return NS_ERROR_INVALID_ARG;
    }
    // src >> FRAME, IFRAME, IMG, INPUT, SCRIPT
    else if (MATCHES(curAttr, "src"))
    {
      if (!MATCHES(tagName, "img")
          && !MATCHES(tagName, "frame") && !MATCHES(tagName, "iframe")
          && !MATCHES(tagName, "input") && !MATCHES(tagName, "script"))
        continue;
      return attrNode->GetValue(aURI);
    }
    //<META http-equiv="refresh" content="3,http://www.acme.com/intro.html">
    else if (MATCHES(curAttr, "content"))
    {
      if (!MATCHES(tagName, "meta"))
        continue;
    }
    // longdesc >> FRAME, IFRAME, IMG
    else if (MATCHES(curAttr, "longdesc"))
    {
      if (!MATCHES(tagName, "img")
          && !MATCHES(tagName, "frame") && !MATCHES(tagName, "iframe"))
        continue;
    }
    // usemap >> IMG, INPUT, OBJECT
    else if (MATCHES(curAttr, "usemap"))
    {
      if (!MATCHES(tagName, "img")
          && !MATCHES(tagName, "input") && !MATCHES(tagName, "object"))
        continue;
    }
    // action >> FORM
    else if (MATCHES(curAttr, "action"))
    {
      if (!MATCHES(tagName, "form"))
        continue;
    }
    // background >> BODY
    else if (MATCHES(curAttr, "background"))
    {
      if (!MATCHES(tagName, "body"))
        continue;
    }
    // codebase >> OBJECT, APPLET
    else if (MATCHES(curAttr, "codebase"))
    {
      if (!MATCHES(tagName, "meta"))
        continue;
    }
    // classid >> OBJECT
    else if (MATCHES(curAttr, "classid"))
    {
//.........这里部分代码省略.........

NS_IMETHODIMP
nsCommandLine::ResolveFile(const nsAString& aArgument, nsIFile* *aResult)
{
  NS_ENSURE_TRUE(mWorkingDir, NS_ERROR_NOT_INITIALIZED);

  // This is some seriously screwed-up code. nsIFile.appendRelativeNativePath
  // explicitly does not accept .. or . path parts, but that is exactly what we
  // need here. So we hack around it.

  nsresult rv;

#if defined(MOZ_WIDGET_COCOA)
  nsCOMPtr<nsILocalFileMac> lfm (do_QueryInterface(mWorkingDir));
  NS_ENSURE_TRUE(lfm, NS_ERROR_NO_INTERFACE);

  nsCOMPtr<nsILocalFileMac> newfile (do_CreateInstance(NS_LOCAL_FILE_CONTRACTID));
  NS_ENSURE_TRUE(newfile, NS_ERROR_OUT_OF_MEMORY);

  CFURLRef baseurl;
  rv = lfm->GetCFURL(&baseurl);
  NS_ENSURE_SUCCESS(rv, rv);

  nsAutoCString path;
  NS_CopyUnicodeToNative(aArgument, path);

  CFURLRef newurl =
    CFURLCreateFromFileSystemRepresentationRelativeToBase(nullptr, (const UInt8*) path.get(),
                                                          path.Length(),
                                                          true, baseurl);

  CFRelease(baseurl);

  rv = newfile->InitWithCFURL(newurl);
  CFRelease(newurl);
  if (NS_FAILED(rv)) return rv;

  newfile.forget(aResult);
  return NS_OK;

#elif defined(XP_UNIX)
  nsCOMPtr<nsIFile> lf (do_CreateInstance(NS_LOCAL_FILE_CONTRACTID));
  NS_ENSURE_TRUE(lf, NS_ERROR_OUT_OF_MEMORY);

  if (aArgument.First() == '/') {
    // absolute path
    rv = lf->InitWithPath(aArgument);
    if (NS_FAILED(rv)) return rv;

    NS_ADDREF(*aResult = lf);
    return NS_OK;
  }

  nsAutoCString nativeArg;
  NS_CopyUnicodeToNative(aArgument, nativeArg);

  nsAutoCString newpath;
  mWorkingDir->GetNativePath(newpath);

  newpath.Append('/');
  newpath.Append(nativeArg);

  rv = lf->InitWithNativePath(newpath);
  if (NS_FAILED(rv)) return rv;

  rv = lf->Normalize();
  if (NS_FAILED(rv)) return rv;

  lf.forget(aResult);
  return NS_OK;

#elif defined(XP_WIN32)
  nsCOMPtr<nsIFile> lf (do_CreateInstance(NS_LOCAL_FILE_CONTRACTID));
  NS_ENSURE_TRUE(lf, NS_ERROR_OUT_OF_MEMORY);

  rv = lf->InitWithPath(aArgument);
  if (NS_FAILED(rv)) {
    // If it's a relative path, the Init is *going* to fail. We use string magic and
    // win32 _fullpath. Note that paths of the form "\Relative\To\CurDrive" are
    // going to fail, and I haven't figured out a way to work around this without
    // the PathCombine() function, which is not available in plain win95/nt4

    nsAutoString fullPath;
    mWorkingDir->GetPath(fullPath);

    fullPath.Append('\\');
    fullPath.Append(aArgument);

    WCHAR pathBuf[MAX_PATH];
    if (!_wfullpath(pathBuf, fullPath.get(), MAX_PATH))
      return NS_ERROR_FAILURE;

    rv = lf->InitWithPath(nsDependentString(pathBuf));
    if (NS_FAILED(rv)) return rv;
  }
  lf.forget(aResult);
  return NS_OK;

#else
#error Need platform-specific logic here.
#endif
//.........这里部分代码省略.........

NS_IMETHODIMP
nsHTMLURIRefObject::GetNextURI(nsAString & aURI)
{
  if (!mNode)
    return NS_ERROR_NOT_INITIALIZED;

  nsAutoString tagName;
  nsresult rv = mNode->GetNodeName(tagName);
  if (NS_FAILED(rv))
  return rv;

  // Loop over attribute list:
  if (!mAttributes)
  {
    nsCOMPtr<nsIDOMElement> element (do_QueryInterface(mNode));
    if (!element)
      return NS_ERROR_INVALID_ARG;

    mCurAttrIndex = 0;
    mNode->GetAttributes(getter_AddRefs(mAttributes));
    if (!mAttributes)
      return NS_ERROR_NOT_INITIALIZED;

    rv = mAttributes->GetLength(&mAttributeCnt);
    NS_ENSURE_SUCCESS(rv, rv);
    if (!mAttributeCnt) return NS_ERROR_FAILURE;
    mCurAttrIndex = 0;
  }
#ifdef DEBUG_akkana
  printf("Looking at tag '%s'\n",
         NS_LossyConvertUCS2toASCII(tagName).get());
#endif
  while (mCurAttrIndex < mAttributeCnt)
  {
    nsCOMPtr<nsIDOMNode> attrNode;
    rv = mAttributes->Item(mCurAttrIndex++, getter_AddRefs(attrNode));
      // XXX Does Item() addref, or not?
      // The comparable code in nsEditor assumes it doesn't.
    NS_ENSURE_SUCCESS(rv, rv);
    NS_ENSURE_ARG_POINTER(attrNode);
    nsCOMPtr<nsIDOMAttr> curAttrNode (do_QueryInterface(attrNode));
    NS_ENSURE_ARG_POINTER(curAttrNode);
    nsString curAttr;
    rv = curAttrNode->GetName(curAttr);
    NS_ENSURE_SUCCESS(rv, rv);

    // href >> A, AREA, BASE, LINK
#ifdef DEBUG_akkana
    printf("Trying to match attribute '%s'\n",
           NS_LossyConvertUCS2toASCII(curAttr).get());
#endif
    if (MATCHES(curAttr, "href"))
    {
      if (!MATCHES(tagName, "a") && !MATCHES(tagName, "area")
          && !MATCHES(tagName, "base") && !MATCHES(tagName, "link"))
        continue;
      rv = curAttrNode->GetValue(aURI);
      NS_ENSURE_SUCCESS(rv, rv);
      nsString uri (aURI);
      // href pointing to a named anchor doesn't count
      if (aURI.First() != PRUnichar('#'))
        return NS_OK;
      aURI.Truncate();
      return NS_ERROR_INVALID_ARG;
    }
    // src >> FRAME, IFRAME, IMG, INPUT, SCRIPT
    else if (MATCHES(curAttr, "src"))
    {
      if (!MATCHES(tagName, "img")
          && !MATCHES(tagName, "frame") && !MATCHES(tagName, "iframe")
          && !MATCHES(tagName, "input") && !MATCHES(tagName, "script"))
        continue;
      return curAttrNode->GetValue(aURI);
    }
    //<META http-equiv="refresh" content="3,http://www.acme.com/intro.html">
    else if (MATCHES(curAttr, "content"))
    {
      if (!MATCHES(tagName, "meta"))
        continue;
    }
    // longdesc >> FRAME, IFRAME, IMG
    else if (MATCHES(curAttr, "longdesc"))
    {
      if (!MATCHES(tagName, "img")
          && !MATCHES(tagName, "frame") && !MATCHES(tagName, "iframe"))
        continue;
    }
    // usemap >> IMG, INPUT, OBJECT
    else if (MATCHES(curAttr, "usemap"))
    {
      if (!MATCHES(tagName, "img")
          && !MATCHES(tagName, "input") && !MATCHES(tagName, "object"))
        continue;
    }
    // action >> FORM
    else if (MATCHES(curAttr, "action"))
    {
      if (!MATCHES(tagName, "form"))
        continue;
    }
//.........这里部分代码省略.........