gecko-dev/layout/style/nsCSSPseudoElements.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is atom lists for CSS pseudos.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   L. David Baron <dbaron@dbaron.org>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * decision by deleting the provisions above and replace them with the notice
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** END LICENSE BLOCK ***** */

/* atom list for CSS pseudo-elements */

#include "mozilla/Util.h"

#include "nsCSSPseudoElements.h"
#include "nsAtomListUtils.h"
#include "nsStaticAtom.h"
#include "nsMemory.h"
#include "nsCSSAnonBoxes.h"

using namespace mozilla;

// define storage for all atoms
#define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
  nsICSSPseudoElement* nsCSSPseudoElements::name_;
#include "nsCSSPseudoElementList.h"
#undef CSS_PSEUDO_ELEMENT

#define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
  NS_STATIC_ATOM_BUFFER(name_##_buffer, value_)
#include "nsCSSPseudoElementList.h"
#undef CSS_PSEUDO_ELEMENT

static const nsStaticAtom CSSPseudoElements_info[] = {
#define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
  NS_STATIC_ATOM(name_##_buffer, (nsIAtom**)&nsCSSPseudoElements::name_),
#include "nsCSSPseudoElementList.h"
#undef CSS_PSEUDO_ELEMENT
};

// Separate from the array above so that we can have an array of
// nsStaticAtom (to pass to NS_RegisterStaticAtoms and
// nsAtomListUtils::IsMember), but with corresponding indices (so the
// i-th element of this array is the flags for the i-th pseudo-element
// in the previous array).
static const PRUint32 CSSPseudoElements_flags[] = {
#define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
  flags_,
#include "nsCSSPseudoElementList.h"
#undef CSS_PSEUDO_ELEMENT
};

void nsCSSPseudoElements::AddRefAtoms()
{
  NS_RegisterStaticAtoms(CSSPseudoElements_info,
                         ArrayLength(CSSPseudoElements_info));
}

bool nsCSSPseudoElements::IsPseudoElement(nsIAtom *aAtom)
{
  return nsAtomListUtils::IsMember(aAtom, CSSPseudoElements_info,
                                   ArrayLength(CSSPseudoElements_info));
}

/* static */ bool
nsCSSPseudoElements::IsCSS2PseudoElement(nsIAtom *aAtom)
{
  // We don't implement this using PseudoElementHasFlags because callers
  // want to pass things that could be anon boxes.
  NS_ASSERTION(nsCSSPseudoElements::IsPseudoElement(aAtom) ||
               nsCSSAnonBoxes::IsAnonBox(aAtom),
               "must be pseudo element or anon box");
  bool result = aAtom == nsCSSPseudoElements::after ||
                  aAtom == nsCSSPseudoElements::before ||
                  aAtom == nsCSSPseudoElements::firstLetter ||
                  aAtom == nsCSSPseudoElements::firstLine;
  NS_ASSERTION(nsCSSAnonBoxes::IsAnonBox(aAtom) ||
               result ==
                 PseudoElementHasFlags(aAtom, CSS_PSEUDO_ELEMENT_IS_CSS2),
               "result doesn't match flags");
  return result;
}

/* static */ nsCSSPseudoElements::Type
nsCSSPseudoElements::GetPseudoType(nsIAtom *aAtom)
{
  for (PRUint32 i = 0; i < ArrayLength(CSSPseudoElements_info); ++i) {
    if (*CSSPseudoElements_info[i].mAtom == aAtom) {
      return Type(i);
    }
  }

  if (nsCSSAnonBoxes::IsAnonBox(aAtom)) {
#ifdef MOZ_XUL
    if (nsCSSAnonBoxes::IsTreePseudoElement(aAtom)) {
      return ePseudo_XULTree;
    }
#endif

    return ePseudo_AnonBox;
  }

  return ePseudo_NotPseudoElement;
}

/* static */ nsIAtom*
nsCSSPseudoElements::GetPseudoAtom(Type aType)
{
  NS_ASSERTION(aType < nsCSSPseudoElements::ePseudo_PseudoElementCount,
               "Unexpected type");
  return *CSSPseudoElements_info[aType].mAtom;
}

/* static */ PRUint32
nsCSSPseudoElements::FlagsForPseudoElement(nsIAtom *aAtom)
{
  PRUint32 i;
  for (i = 0; i < ArrayLength(CSSPseudoElements_info); ++i) {
    if (*CSSPseudoElements_info[i].mAtom == aAtom) {
      break;
    }
  }
  NS_ASSERTION(i < ArrayLength(CSSPseudoElements_info),
               "argument must be a pseudo-element");
  return CSSPseudoElements_flags[i];
}