mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-08 12:37:37 +00:00
126 lines
4.4 KiB
C++
126 lines
4.4 KiB
C++
/* ***** 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 nsCSSDataBlock.h.
|
|
*
|
|
* The Initial Developer of the Original Code is L. David Baron.
|
|
* Portions created by the Initial Developer are Copyright (C) 2003
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* L. David Baron <dbaron@dbaron.org> (original author)
|
|
*
|
|
* 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
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
/* bit vectors for sets of CSS properties */
|
|
|
|
#ifndef nsCSSPropertySet_h__
|
|
#define nsCSSPropertySet_h__
|
|
|
|
#include "mozilla/Util.h"
|
|
|
|
#include "nsCSSProperty.h"
|
|
#include <limits.h> // for CHAR_BIT
|
|
|
|
/**
|
|
* nsCSSPropertySet maintains a set of non-shorthand CSS properties. In
|
|
* other words, for each longhand CSS property we support, it has a bit
|
|
* for whether that property is in the set.
|
|
*/
|
|
class nsCSSPropertySet {
|
|
public:
|
|
nsCSSPropertySet() { Empty(); }
|
|
// auto-generated copy-constructor OK
|
|
|
|
void AssertInSetRange(nsCSSProperty aProperty) const {
|
|
NS_ASSERTION(0 <= aProperty &&
|
|
aProperty < eCSSProperty_COUNT_no_shorthands,
|
|
"out of bounds");
|
|
}
|
|
|
|
// Conversion of aProperty to |size_t| after AssertInSetRange
|
|
// lets the compiler generate significantly tighter code.
|
|
|
|
void AddProperty(nsCSSProperty aProperty) {
|
|
AssertInSetRange(aProperty);
|
|
size_t p = aProperty;
|
|
mProperties[p / kBitsInChunk] |=
|
|
property_set_type(1) << (p % kBitsInChunk);
|
|
}
|
|
|
|
void RemoveProperty(nsCSSProperty aProperty) {
|
|
AssertInSetRange(aProperty);
|
|
size_t p = aProperty;
|
|
mProperties[p / kBitsInChunk] &=
|
|
~(property_set_type(1) << (p % kBitsInChunk));
|
|
}
|
|
|
|
bool HasProperty(nsCSSProperty aProperty) const {
|
|
AssertInSetRange(aProperty);
|
|
size_t p = aProperty;
|
|
return (mProperties[p / kBitsInChunk] &
|
|
(property_set_type(1) << (p % kBitsInChunk))) != 0;
|
|
}
|
|
|
|
void Empty() {
|
|
memset(mProperties, 0, sizeof(mProperties));
|
|
}
|
|
|
|
void AssertIsEmpty(const char* aText) const {
|
|
for (size_t i = 0; i < mozilla::ArrayLength(mProperties); ++i) {
|
|
NS_ASSERTION(mProperties[i] == 0, aText);
|
|
}
|
|
}
|
|
|
|
private:
|
|
typedef unsigned long property_set_type;
|
|
public:
|
|
// number of bits in |property_set_type|.
|
|
static const size_t kBitsInChunk = sizeof(property_set_type)*CHAR_BIT;
|
|
// number of |property_set_type|s in the set
|
|
static const size_t kChunkCount =
|
|
(eCSSProperty_COUNT_no_shorthands + kBitsInChunk - 1) / kBitsInChunk;
|
|
|
|
/*
|
|
* For fast enumeration of all the bits that are set, callers can
|
|
* check each chunk against zero (since in normal cases few bits are
|
|
* likely to be set).
|
|
*/
|
|
bool HasPropertyInChunk(size_t aChunk) const {
|
|
return mProperties[aChunk] != 0;
|
|
}
|
|
bool HasPropertyAt(size_t aChunk, size_t aBit) const {
|
|
return (mProperties[aChunk] & (property_set_type(1) << aBit)) != 0;
|
|
}
|
|
static nsCSSProperty CSSPropertyAt(size_t aChunk, size_t aBit) {
|
|
return nsCSSProperty(aChunk * kBitsInChunk + aBit);
|
|
}
|
|
|
|
private:
|
|
property_set_type mProperties[kChunkCount];
|
|
};
|
|
|
|
#endif /* !defined(nsCSSPropertySet_h__) */
|