gecko-dev/dom/base/nsMappedAttributes.cpp

276 lines
6.4 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* A unique per-element set of attributes that is used as an
* nsIStyleRule; used to implement presentational attributes.
*/
#include "nsMappedAttributes.h"
#include "nsHTMLStyleSheet.h"
#include "nsRuleWalker.h"
#include "mozilla/HashFunctions.h"
#include "mozilla/MemoryReporting.h"
using namespace mozilla;
nsMappedAttributes::nsMappedAttributes(nsHTMLStyleSheet* aSheet,
nsMapRuleToAttributesFunc aMapRuleFunc)
: mAttrCount(0),
mSheet(aSheet),
mRuleMapper(aMapRuleFunc)
{
}
nsMappedAttributes::nsMappedAttributes(const nsMappedAttributes& aCopy)
: mAttrCount(aCopy.mAttrCount),
mSheet(aCopy.mSheet),
mRuleMapper(aCopy.mRuleMapper)
{
NS_ASSERTION(mBufferSize >= aCopy.mAttrCount, "can't fit attributes");
uint32_t i;
for (i = 0; i < mAttrCount; ++i) {
new (&Attrs()[i]) InternalAttr(aCopy.Attrs()[i]);
}
}
nsMappedAttributes::~nsMappedAttributes()
{
if (mSheet) {
mSheet->DropMappedAttributes(this);
}
uint32_t i;
for (i = 0; i < mAttrCount; ++i) {
Attrs()[i].~InternalAttr();
}
}
nsMappedAttributes*
nsMappedAttributes::Clone(bool aWillAddAttr)
{
uint32_t extra = aWillAddAttr ? 1 : 0;
// This will call the overridden operator new
return new (mAttrCount + extra) nsMappedAttributes(*this);
}
void* nsMappedAttributes::operator new(size_t aSize, uint32_t aAttrCount) CPP_THROW_NEW
{
NS_ASSERTION(aAttrCount > 0, "zero-attribute nsMappedAttributes requested");
// aSize will include the mAttrs buffer so subtract that.
void* newAttrs = ::operator new(aSize - sizeof(void*[1]) +
aAttrCount * sizeof(InternalAttr));
#ifdef DEBUG
static_cast<nsMappedAttributes*>(newAttrs)->mBufferSize = aAttrCount;
#endif
return newAttrs;
}
NS_IMPL_ISUPPORTS(nsMappedAttributes,
nsIStyleRule)
void
nsMappedAttributes::SetAndTakeAttr(nsIAtom* aAttrName, nsAttrValue& aValue)
{
NS_PRECONDITION(aAttrName, "null name");
uint32_t i;
for (i = 0; i < mAttrCount && !Attrs()[i].mName.IsSmaller(aAttrName); ++i) {
if (Attrs()[i].mName.Equals(aAttrName)) {
Attrs()[i].mValue.Reset();
Attrs()[i].mValue.SwapValueWith(aValue);
return;
}
}
NS_ASSERTION(mBufferSize >= mAttrCount + 1, "can't fit attributes");
if (mAttrCount != i) {
memmove(&Attrs()[i + 1], &Attrs()[i], (mAttrCount - i) * sizeof(InternalAttr));
}
new (&Attrs()[i].mName) nsAttrName(aAttrName);
new (&Attrs()[i].mValue) nsAttrValue();
Attrs()[i].mValue.SwapValueWith(aValue);
++mAttrCount;
}
const nsAttrValue*
nsMappedAttributes::GetAttr(nsIAtom* aAttrName) const
{
NS_PRECONDITION(aAttrName, "null name");
for (uint32_t i = 0; i < mAttrCount; ++i) {
if (Attrs()[i].mName.Equals(aAttrName)) {
return &Attrs()[i].mValue;
}
}
return nullptr;
}
const nsAttrValue*
nsMappedAttributes::GetAttr(const nsAString& aAttrName) const
{
for (uint32_t i = 0; i < mAttrCount; ++i) {
if (Attrs()[i].mName.Atom()->Equals(aAttrName)) {
return &Attrs()[i].mValue;
}
}
return nullptr;
}
bool
nsMappedAttributes::Equals(const nsMappedAttributes* aOther) const
{
if (this == aOther) {
return true;
}
if (mRuleMapper != aOther->mRuleMapper || mAttrCount != aOther->mAttrCount) {
return false;
}
uint32_t i;
for (i = 0; i < mAttrCount; ++i) {
if (!Attrs()[i].mName.Equals(aOther->Attrs()[i].mName) ||
!Attrs()[i].mValue.Equals(aOther->Attrs()[i].mValue)) {
return false;
}
}
return true;
}
uint32_t
nsMappedAttributes::HashValue() const
{
uint32_t hash = HashGeneric(mRuleMapper);
uint32_t i;
for (i = 0; i < mAttrCount; ++i) {
hash = AddToHash(hash,
Attrs()[i].mName.HashValue(),
Attrs()[i].mValue.HashValue());
}
return hash;
}
void
nsMappedAttributes::SetStyleSheet(nsHTMLStyleSheet* aSheet)
{
if (mSheet) {
mSheet->DropMappedAttributes(this);
}
mSheet = aSheet; // not ref counted
}
/* virtual */ void
nsMappedAttributes::MapRuleInfoInto(nsRuleData* aRuleData)
{
if (mRuleMapper) {
(*mRuleMapper)(this, aRuleData);
}
}
/* virtual */ bool
nsMappedAttributes::MightMapInheritedStyleData()
{
// Just assume that we do, rather than adding checks to all of the different
// kinds of attribute mapping functions we have.
return true;
}
#ifdef DEBUG
/* virtual */ void
nsMappedAttributes::List(FILE* out, int32_t aIndent) const
{
nsAutoCString str;
nsAutoString tmp;
uint32_t i;
for (i = 0; i < mAttrCount; ++i) {
int32_t indent;
for (indent = aIndent; indent > 0; --indent) {
str.AppendLiteral(" ");
}
Attrs()[i].mName.GetQualifiedName(tmp);
LossyAppendUTF16toASCII(tmp, str);
Attrs()[i].mValue.ToString(tmp);
LossyAppendUTF16toASCII(tmp, str);
str.Append('\n');
fprintf_stderr(out, "%s", str.get());
}
}
#endif
void
nsMappedAttributes::RemoveAttrAt(uint32_t aPos, nsAttrValue& aValue)
{
Attrs()[aPos].mValue.SwapValueWith(aValue);
Attrs()[aPos].~InternalAttr();
memmove(&Attrs()[aPos], &Attrs()[aPos + 1],
(mAttrCount - aPos - 1) * sizeof(InternalAttr));
mAttrCount--;
}
const nsAttrName*
nsMappedAttributes::GetExistingAttrNameFromQName(const nsAString& aName) const
{
uint32_t i;
for (i = 0; i < mAttrCount; ++i) {
if (Attrs()[i].mName.IsAtom()) {
if (Attrs()[i].mName.Atom()->Equals(aName)) {
return &Attrs()[i].mName;
}
}
else {
if (Attrs()[i].mName.NodeInfo()->QualifiedNameEquals(aName)) {
return &Attrs()[i].mName;
}
}
}
return nullptr;
}
int32_t
nsMappedAttributes::IndexOfAttr(nsIAtom* aLocalName) const
{
uint32_t i;
for (i = 0; i < mAttrCount; ++i) {
if (Attrs()[i].mName.Equals(aLocalName)) {
return i;
}
}
return -1;
}
size_t
nsMappedAttributes::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
NS_ASSERTION(mAttrCount == mBufferSize,
"mBufferSize and mAttrCount are expected to be the same.");
size_t n = aMallocSizeOf(this);
for (uint16_t i = 0; i < mAttrCount; ++i) {
n += Attrs()[i].mValue.SizeOfExcludingThis(aMallocSizeOf);
}
return n;
}