1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/base/src/nsMappedAttributes.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,263 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/*
1.10 + * A unique per-element set of attributes that is used as an
1.11 + * nsIStyleRule; used to implement presentational attributes.
1.12 + */
1.13 +
1.14 +#include "nsMappedAttributes.h"
1.15 +#include "nsHTMLStyleSheet.h"
1.16 +#include "nsRuleWalker.h"
1.17 +#include "mozilla/HashFunctions.h"
1.18 +#include "mozilla/MemoryReporting.h"
1.19 +
1.20 +using namespace mozilla;
1.21 +
1.22 +nsMappedAttributes::nsMappedAttributes(nsHTMLStyleSheet* aSheet,
1.23 + nsMapRuleToAttributesFunc aMapRuleFunc)
1.24 + : mAttrCount(0),
1.25 + mSheet(aSheet),
1.26 + mRuleMapper(aMapRuleFunc)
1.27 +{
1.28 +}
1.29 +
1.30 +nsMappedAttributes::nsMappedAttributes(const nsMappedAttributes& aCopy)
1.31 + : mAttrCount(aCopy.mAttrCount),
1.32 + mSheet(aCopy.mSheet),
1.33 + mRuleMapper(aCopy.mRuleMapper)
1.34 +{
1.35 + NS_ASSERTION(mBufferSize >= aCopy.mAttrCount, "can't fit attributes");
1.36 +
1.37 + uint32_t i;
1.38 + for (i = 0; i < mAttrCount; ++i) {
1.39 + new (&Attrs()[i]) InternalAttr(aCopy.Attrs()[i]);
1.40 + }
1.41 +}
1.42 +
1.43 +nsMappedAttributes::~nsMappedAttributes()
1.44 +{
1.45 + if (mSheet) {
1.46 + mSheet->DropMappedAttributes(this);
1.47 + }
1.48 +
1.49 + uint32_t i;
1.50 + for (i = 0; i < mAttrCount; ++i) {
1.51 + Attrs()[i].~InternalAttr();
1.52 + }
1.53 +}
1.54 +
1.55 +
1.56 +nsMappedAttributes*
1.57 +nsMappedAttributes::Clone(bool aWillAddAttr)
1.58 +{
1.59 + uint32_t extra = aWillAddAttr ? 1 : 0;
1.60 +
1.61 + // This will call the overridden operator new
1.62 + return new (mAttrCount + extra) nsMappedAttributes(*this);
1.63 +}
1.64 +
1.65 +void* nsMappedAttributes::operator new(size_t aSize, uint32_t aAttrCount) CPP_THROW_NEW
1.66 +{
1.67 + NS_ASSERTION(aAttrCount > 0, "zero-attribute nsMappedAttributes requested");
1.68 +
1.69 + // aSize will include the mAttrs buffer so subtract that.
1.70 + void* newAttrs = ::operator new(aSize - sizeof(void*[1]) +
1.71 + aAttrCount * sizeof(InternalAttr));
1.72 +
1.73 +#ifdef DEBUG
1.74 + static_cast<nsMappedAttributes*>(newAttrs)->mBufferSize = aAttrCount;
1.75 +#endif
1.76 +
1.77 + return newAttrs;
1.78 +}
1.79 +
1.80 +NS_IMPL_ISUPPORTS(nsMappedAttributes,
1.81 + nsIStyleRule)
1.82 +
1.83 +void
1.84 +nsMappedAttributes::SetAndTakeAttr(nsIAtom* aAttrName, nsAttrValue& aValue)
1.85 +{
1.86 + NS_PRECONDITION(aAttrName, "null name");
1.87 +
1.88 + uint32_t i;
1.89 + for (i = 0; i < mAttrCount && !Attrs()[i].mName.IsSmaller(aAttrName); ++i) {
1.90 + if (Attrs()[i].mName.Equals(aAttrName)) {
1.91 + Attrs()[i].mValue.Reset();
1.92 + Attrs()[i].mValue.SwapValueWith(aValue);
1.93 + return;
1.94 + }
1.95 + }
1.96 +
1.97 + NS_ASSERTION(mBufferSize >= mAttrCount + 1, "can't fit attributes");
1.98 +
1.99 + if (mAttrCount != i) {
1.100 + memmove(&Attrs()[i + 1], &Attrs()[i], (mAttrCount - i) * sizeof(InternalAttr));
1.101 + }
1.102 +
1.103 + new (&Attrs()[i].mName) nsAttrName(aAttrName);
1.104 + new (&Attrs()[i].mValue) nsAttrValue();
1.105 + Attrs()[i].mValue.SwapValueWith(aValue);
1.106 + ++mAttrCount;
1.107 +}
1.108 +
1.109 +const nsAttrValue*
1.110 +nsMappedAttributes::GetAttr(nsIAtom* aAttrName) const
1.111 +{
1.112 + NS_PRECONDITION(aAttrName, "null name");
1.113 +
1.114 + for (uint32_t i = 0; i < mAttrCount; ++i) {
1.115 + if (Attrs()[i].mName.Equals(aAttrName)) {
1.116 + return &Attrs()[i].mValue;
1.117 + }
1.118 + }
1.119 +
1.120 + return nullptr;
1.121 +}
1.122 +
1.123 +const nsAttrValue*
1.124 +nsMappedAttributes::GetAttr(const nsAString& aAttrName) const
1.125 +{
1.126 + for (uint32_t i = 0; i < mAttrCount; ++i) {
1.127 + if (Attrs()[i].mName.Atom()->Equals(aAttrName)) {
1.128 + return &Attrs()[i].mValue;
1.129 + }
1.130 + }
1.131 +
1.132 + return nullptr;
1.133 +}
1.134 +
1.135 +bool
1.136 +nsMappedAttributes::Equals(const nsMappedAttributes* aOther) const
1.137 +{
1.138 + if (this == aOther) {
1.139 + return true;
1.140 + }
1.141 +
1.142 + if (mRuleMapper != aOther->mRuleMapper || mAttrCount != aOther->mAttrCount) {
1.143 + return false;
1.144 + }
1.145 +
1.146 + uint32_t i;
1.147 + for (i = 0; i < mAttrCount; ++i) {
1.148 + if (!Attrs()[i].mName.Equals(aOther->Attrs()[i].mName) ||
1.149 + !Attrs()[i].mValue.Equals(aOther->Attrs()[i].mValue)) {
1.150 + return false;
1.151 + }
1.152 + }
1.153 +
1.154 + return true;
1.155 +}
1.156 +
1.157 +uint32_t
1.158 +nsMappedAttributes::HashValue() const
1.159 +{
1.160 + uint32_t hash = HashGeneric(mRuleMapper);
1.161 +
1.162 + uint32_t i;
1.163 + for (i = 0; i < mAttrCount; ++i) {
1.164 + hash = AddToHash(hash,
1.165 + Attrs()[i].mName.HashValue(),
1.166 + Attrs()[i].mValue.HashValue());
1.167 + }
1.168 +
1.169 + return hash;
1.170 +}
1.171 +
1.172 +void
1.173 +nsMappedAttributes::SetStyleSheet(nsHTMLStyleSheet* aSheet)
1.174 +{
1.175 + if (mSheet) {
1.176 + mSheet->DropMappedAttributes(this);
1.177 + }
1.178 + mSheet = aSheet; // not ref counted
1.179 +}
1.180 +
1.181 +/* virtual */ void
1.182 +nsMappedAttributes::MapRuleInfoInto(nsRuleData* aRuleData)
1.183 +{
1.184 + if (mRuleMapper) {
1.185 + (*mRuleMapper)(this, aRuleData);
1.186 + }
1.187 +}
1.188 +
1.189 +#ifdef DEBUG
1.190 +/* virtual */ void
1.191 +nsMappedAttributes::List(FILE* out, int32_t aIndent) const
1.192 +{
1.193 + nsAutoString buffer;
1.194 + uint32_t i;
1.195 +
1.196 + for (i = 0; i < mAttrCount; ++i) {
1.197 + int32_t indent;
1.198 + for (indent = aIndent; indent > 0; --indent)
1.199 + fputs(" ", out);
1.200 +
1.201 + Attrs()[i].mName.GetQualifiedName(buffer);
1.202 + fputs(NS_LossyConvertUTF16toASCII(buffer).get(), out);
1.203 +
1.204 + Attrs()[i].mValue.ToString(buffer);
1.205 + fputs(NS_LossyConvertUTF16toASCII(buffer).get(), out);
1.206 + fputs("\n", out);
1.207 + }
1.208 +}
1.209 +#endif
1.210 +
1.211 +void
1.212 +nsMappedAttributes::RemoveAttrAt(uint32_t aPos, nsAttrValue& aValue)
1.213 +{
1.214 + Attrs()[aPos].mValue.SwapValueWith(aValue);
1.215 + Attrs()[aPos].~InternalAttr();
1.216 + memmove(&Attrs()[aPos], &Attrs()[aPos + 1],
1.217 + (mAttrCount - aPos - 1) * sizeof(InternalAttr));
1.218 + mAttrCount--;
1.219 +}
1.220 +
1.221 +const nsAttrName*
1.222 +nsMappedAttributes::GetExistingAttrNameFromQName(const nsAString& aName) const
1.223 +{
1.224 + uint32_t i;
1.225 + for (i = 0; i < mAttrCount; ++i) {
1.226 + if (Attrs()[i].mName.IsAtom()) {
1.227 + if (Attrs()[i].mName.Atom()->Equals(aName)) {
1.228 + return &Attrs()[i].mName;
1.229 + }
1.230 + }
1.231 + else {
1.232 + if (Attrs()[i].mName.NodeInfo()->QualifiedNameEquals(aName)) {
1.233 + return &Attrs()[i].mName;
1.234 + }
1.235 + }
1.236 + }
1.237 +
1.238 + return nullptr;
1.239 +}
1.240 +
1.241 +int32_t
1.242 +nsMappedAttributes::IndexOfAttr(nsIAtom* aLocalName) const
1.243 +{
1.244 + uint32_t i;
1.245 + for (i = 0; i < mAttrCount; ++i) {
1.246 + if (Attrs()[i].mName.Equals(aLocalName)) {
1.247 + return i;
1.248 + }
1.249 + }
1.250 +
1.251 + return -1;
1.252 +}
1.253 +
1.254 +size_t
1.255 +nsMappedAttributes::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
1.256 +{
1.257 + NS_ASSERTION(mAttrCount == mBufferSize,
1.258 + "mBufferSize and mAttrCount are expected to be the same.");
1.259 +
1.260 + size_t n = aMallocSizeOf(this);
1.261 + for (uint16_t i = 0; i < mAttrCount; ++i) {
1.262 + n += Attrs()[i].mValue.SizeOfExcludingThis(aMallocSizeOf);
1.263 + }
1.264 + return n;
1.265 +}
1.266 +
