layout/style/nsCSSPseudoElements.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is atom lists for CSS pseudos.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   L. David Baron <dbaron@dbaron.org>
  24  *
  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either the GNU General Public License Version 2 or later (the "GPL"), or
  27  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28  * in which case the provisions of the GPL or the LGPL are applicable instead
  29  * of those above. If you wish to allow use of your version of this file only
  30  * under the terms of either the GPL or the LGPL, and not to allow others to
  31  * use your version of this file under the terms of the MPL, indicate your
  32  * decision by deleting the provisions above and replace them with the notice
  33  * and other provisions required by the GPL or the LGPL. If you do not delete
  34  * the provisions above, a recipient may use your version of this file under
  35  * the terms of any one of the MPL, the GPL or the LGPL.
  36  *
  37  * ***** END LICENSE BLOCK ***** */
  38
  39 /* atom list for CSS pseudo-elements */
  40
  41 #include "nsCSSPseudoElements.h"
  42 #include "nsAtomListUtils.h"
  43 #include "nsStaticAtom.h"
  44 #include "nsMemory.h"
  45 #include "nsCSSAnonBoxes.h"
  46
  47 // define storage for all atoms
  48 #define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
  49   nsICSSPseudoElement* nsCSSPseudoElements::name_;
  50 #include "nsCSSPseudoElementList.h"
  51 #undef CSS_PSEUDO_ELEMENT
  52
  53 #define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
  54   NS_STATIC_ATOM_BUFFER(name_##_buffer, value_)
  55 #include "nsCSSPseudoElementList.h"
  56 #undef CSS_PSEUDO_ELEMENT
  57
  58 static const nsStaticAtom CSSPseudoElements_info[] = {
  59 #define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
  60   NS_STATIC_ATOM(name_##_buffer, (nsIAtom**)&nsCSSPseudoElements::name_),
  61 #include "nsCSSPseudoElementList.h"
  62 #undef CSS_PSEUDO_ELEMENT
  63 };
  64
  65 // Separate from the array above so that we can have an array of
  66 // nsStaticAtom (to pass to NS_RegisterStaticAtoms and
  67 // nsAtomListUtils::IsMember), but with corresponding indices (so the
  68 // i-th element of this array is the flags for the i-th pseudo-element
  69 // in the previous array).
  70 static const PRUint32 CSSPseudoElements_flags[] = {
  71 #define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
  72   flags_,
  73 #include "nsCSSPseudoElementList.h"
  74 #undef CSS_PSEUDO_ELEMENT
  75 };
  76
  77 void nsCSSPseudoElements::AddRefAtoms()
  78 {
  79   NS_RegisterStaticAtoms(CSSPseudoElements_info,
  80                          NS_ARRAY_LENGTH(CSSPseudoElements_info));
  81 }
  82
  83 PRBool nsCSSPseudoElements::IsPseudoElement(nsIAtom *aAtom)
  84 {
  85   return nsAtomListUtils::IsMember(aAtom, CSSPseudoElements_info,
  86                                    NS_ARRAY_LENGTH(CSSPseudoElements_info));
  87 }
  88
  89 /* static */ PRBool
  90 nsCSSPseudoElements::IsCSS2PseudoElement(nsIAtom *aAtom)
  91 {
  92   // We don't implement this using PseudoElementHasFlags because callers
  93   // want to pass things that could be anon boxes.
  94   NS_ASSERTION(nsCSSPseudoElements::IsPseudoElement(aAtom) ||
  95                nsCSSAnonBoxes::IsAnonBox(aAtom),
  96                "must be pseudo element or anon box");
  97   PRBool result = aAtom == nsCSSPseudoElements::after ||
  98                   aAtom == nsCSSPseudoElements::before ||
  99                   aAtom == nsCSSPseudoElements::firstLetter ||
 100                   aAtom == nsCSSPseudoElements::firstLine;
 101   NS_ASSERTION(nsCSSAnonBoxes::IsAnonBox(aAtom) ||
 102                result ==
 103                  PseudoElementHasFlags(aAtom, CSS_PSEUDO_ELEMENT_IS_CSS2),
 104                "result doesn't match flags");
 105   return result;
 106 }
 107
 108 /* static */ nsCSSPseudoElements::Type
 109 nsCSSPseudoElements::GetPseudoType(nsIAtom *aAtom)
 110 {
 111   for (PRUint32 i = 0; i < NS_ARRAY_LENGTH(CSSPseudoElements_info); ++i) {
 112     if (*CSSPseudoElements_info[i].mAtom == aAtom) {
 113       return Type(i);
 114     }
 115   }
 116
 117   if (nsCSSAnonBoxes::IsAnonBox(aAtom)) {
 118 #ifdef MOZ_XUL
 119     if (nsCSSAnonBoxes::IsTreePseudoElement(aAtom)) {
 120       return ePseudo_XULTree;
 121     }
 122 #endif
 123
 124     return ePseudo_AnonBox;
 125   }
 126
 127   return ePseudo_NotPseudoElement;
 128 }
 129
 130 /* static */ nsIAtom*
 131 nsCSSPseudoElements::GetPseudoAtom(Type aType)
 132 {
 133   NS_ASSERTION(aType < nsCSSPseudoElements::ePseudo_PseudoElementCount,
 134                "Unexpected type");
 135   return *CSSPseudoElements_info[aType].mAtom;
 136 }
 137
 138 /* static */ PRUint32
 139 nsCSSPseudoElements::FlagsForPseudoElement(nsIAtom *aAtom)
 140 {
 141   PRUint32 i;
 142   for (i = 0; i < NS_ARRAY_LENGTH(CSSPseudoElements_info); ++i) {
 143     if (*CSSPseudoElements_info[i].mAtom == aAtom) {
 144       break;
 145     }
 146   }
 147   NS_ASSERTION(i < NS_ARRAY_LENGTH(CSSPseudoElements_info),
 148                "argument must be a pseudo-element");
 149   return CSSPseudoElements_flags[i];
 150 }