pjs/layout/style/nsRuleData.cpp

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/* -*- 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 Mozilla Communicator client code.
*
* 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):
* Original Author: David W. Hyatt (hyatt@netscape.com)
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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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*
* ***** END LICENSE BLOCK ***** */
#include "nsRuleData.h"
#include "nsCSSProps.h"
namespace {
struct PropertyOffsetInfo {
// XXX These could probably be pointer-to-member, if the casting can
// be done correctly.
size_t struct_offset; // offset of nsRuleDataThing* in nsRuleData
size_t member_offset; // offset of value in nsRuleDataThing
};
const PropertyOffsetInfo kOffsetTable[eCSSProperty_COUNT_no_shorthands] = {
#define CSS_PROP_BACKENDONLY(name_, id_, method_, flags_, datastruct_, \
member_, kwtable_) \
{ size_t(-1), size_t(-1) },
#define CSS_PROP(name_, id_, method_, flags_, datastruct_, member_, \
kwtable_, stylestruct_, stylestructoffset_, animtype_) \
{ offsetof(nsRuleData, m##datastruct_##Data), \
offsetof(nsRuleData##datastruct_, member_) },
#include "nsCSSPropList.h"
#undef CSS_PROP
#undef CSS_PROP_BACKENDONLY
};
} // anon namespace
nsCSSValue*
nsRuleData::ValueFor(nsCSSProperty aProperty)
{
NS_ABORT_IF_FALSE(aProperty < eCSSProperty_COUNT_no_shorthands,
"invalid or shorthand property");
const PropertyOffsetInfo& offsets = kOffsetTable[aProperty];
NS_ABORT_IF_FALSE(offsets.struct_offset != size_t(-1),
"backend-only property");
char* cssstruct = *reinterpret_cast<char**>
(reinterpret_cast<char*>(this) + offsets.struct_offset);
NS_ABORT_IF_FALSE(cssstruct, "substructure pointer should never be null");
return reinterpret_cast<nsCSSValue*>(cssstruct + offsets.member_offset);
}