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124 lines
4.4 KiB
C++
124 lines
4.4 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is nsCSSDataBlock.h.
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*
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* The Initial Developer of the Original Code is L. David Baron.
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* Portions created by the Initial Developer are Copyright (C) 2003
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* bit vectors for sets of CSS properties */
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#ifndef nsCSSPropertySet_h__
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#define nsCSSPropertySet_h__
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#include "nsCSSProperty.h"
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#include <limits.h> // for CHAR_BIT
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/**
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* nsCSSPropertySet maintains a set of non-shorthand CSS properties. In
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* other words, for each longhand CSS property we support, it has a bit
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* for whether that property is in the set.
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*/
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class nsCSSPropertySet {
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public:
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nsCSSPropertySet() { Empty(); }
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// auto-generated copy-constructor OK
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void AssertInSetRange(nsCSSProperty aProperty) const {
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NS_ASSERTION(0 <= aProperty &&
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aProperty < eCSSProperty_COUNT_no_shorthands,
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"out of bounds");
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}
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// Conversion of aProperty to |size_t| after AssertInSetRange
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// lets the compiler generate significantly tighter code.
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void AddProperty(nsCSSProperty aProperty) {
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AssertInSetRange(aProperty);
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size_t p = aProperty;
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mProperties[p / kBitsInChunk] |=
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property_set_type(1) << (p % kBitsInChunk);
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}
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void RemoveProperty(nsCSSProperty aProperty) {
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AssertInSetRange(aProperty);
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size_t p = aProperty;
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mProperties[p / kBitsInChunk] &=
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~(property_set_type(1) << (p % kBitsInChunk));
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}
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bool HasProperty(nsCSSProperty aProperty) const {
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AssertInSetRange(aProperty);
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size_t p = aProperty;
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return (mProperties[p / kBitsInChunk] &
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(property_set_type(1) << (p % kBitsInChunk))) != 0;
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}
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void Empty() {
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memset(mProperties, 0, sizeof(mProperties));
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}
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void AssertIsEmpty(const char* aText) const {
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for (size_t i = 0; i < NS_ARRAY_LENGTH(mProperties); ++i) {
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NS_ASSERTION(mProperties[i] == 0, aText);
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}
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}
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private:
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typedef unsigned long property_set_type;
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public:
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// number of bits in |property_set_type|.
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static const size_t kBitsInChunk = sizeof(property_set_type)*CHAR_BIT;
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// number of |property_set_type|s in the set
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static const size_t kChunkCount =
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(eCSSProperty_COUNT_no_shorthands + kBitsInChunk - 1) / kBitsInChunk;
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/*
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* For fast enumeration of all the bits that are set, callers can
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* check each chunk against zero (since in normal cases few bits are
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* likely to be set).
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*/
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bool HasPropertyInChunk(size_t aChunk) const {
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return mProperties[aChunk] != 0;
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}
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bool HasPropertyAt(size_t aChunk, size_t aBit) const {
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return (mProperties[aChunk] & (property_set_type(1) << aBit)) != 0;
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}
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static nsCSSProperty CSSPropertyAt(size_t aChunk, size_t aBit) {
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return nsCSSProperty(aChunk * kBitsInChunk + aBit);
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}
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private:
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property_set_type mProperties[kChunkCount];
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};
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#endif /* !defined(nsCSSPropertySet_h__) */
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