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gecko-dev/layout/style/nsHTMLStyleSheet.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* 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/.
*
* This Original Code has been modified by IBM Corporation. Modifications made by IBM
* described herein are Copyright (c) International Business Machines Corporation, 2000.
* Modifications to Mozilla code or documentation identified per MPL Section 3.3
*
* Date Modified by Description of modification
* 04/20/2000 IBM Corp. OS/2 VisualAge build.
*/
/*
* style sheet and style rule processor representing data from presentational
* HTML attributes
*/
#include "nsHTMLStyleSheet.h"
#include "nsMappedAttributes.h"
#include "nsGkAtoms.h"
#include "nsPresContext.h"
#include "nsEventStates.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsStyleConsts.h"
#include "nsRuleWalker.h"
#include "nsRuleData.h"
#include "nsError.h"
#include "nsRuleProcessorData.h"
#include "nsCSSRuleProcessor.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/Element.h"
#include "nsHashKeys.h"
#include "RestyleManager.h"
using namespace mozilla;
using namespace mozilla::dom;
NS_IMPL_ISUPPORTS1(nsHTMLStyleSheet::HTMLColorRule, nsIStyleRule)
/* virtual */ void
nsHTMLStyleSheet::HTMLColorRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
if (aRuleData->mSIDs & NS_STYLE_INHERIT_BIT(Color)) {
nsCSSValue* color = aRuleData->ValueForColor();
if (color->GetUnit() == eCSSUnit_Null &&
aRuleData->mPresContext->UseDocumentColors())
color->SetColorValue(mColor);
}
}
#ifdef DEBUG
/* virtual */ void
nsHTMLStyleSheet::HTMLColorRule::List(FILE* out, int32_t aIndent) const
{
for (int32_t index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("[html color rule] {}\n", out);
}
#endif
NS_IMPL_ISUPPORTS1(nsHTMLStyleSheet::GenericTableRule, nsIStyleRule)
#ifdef DEBUG
/* virtual */ void
nsHTMLStyleSheet::GenericTableRule::List(FILE* out, int32_t aIndent) const
{
for (int32_t index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("[generic table rule] {}\n", out);
}
#endif
/* virtual */ void
nsHTMLStyleSheet::TableTHRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
if (aRuleData->mSIDs & NS_STYLE_INHERIT_BIT(Text)) {
nsCSSValue* textAlign = aRuleData->ValueForTextAlign();
if (textAlign->GetUnit() == eCSSUnit_Null) {
textAlign->SetIntValue(NS_STYLE_TEXT_ALIGN_MOZ_CENTER_OR_INHERIT,
eCSSUnit_Enumerated);
}
}
}
/* virtual */ void
nsHTMLStyleSheet::TableQuirkColorRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
if (aRuleData->mSIDs & NS_STYLE_INHERIT_BIT(Color)) {
nsCSSValue* color = aRuleData->ValueForColor();
// We do not check UseDocumentColors() here, because we want to
// use the body color no matter what.
if (color->GetUnit() == eCSSUnit_Null)
color->SetIntValue(NS_STYLE_COLOR_INHERIT_FROM_BODY,
eCSSUnit_Enumerated);
}
}
NS_IMPL_ISUPPORTS1(nsHTMLStyleSheet::LangRule, nsIStyleRule)
/* virtual */ void
nsHTMLStyleSheet::LangRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
if (aRuleData->mSIDs & NS_STYLE_INHERIT_BIT(Font)) {
nsCSSValue* lang = aRuleData->ValueForLang();
if (lang->GetUnit() == eCSSUnit_Null) {
lang->SetStringValue(mLang, eCSSUnit_Ident);
}
}
}
#ifdef DEBUG
/* virtual */ void
nsHTMLStyleSheet::LangRule::List(FILE* out, int32_t aIndent) const
{
for (int32_t index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("[lang rule] { language: \"", out);
fputs(NS_ConvertUTF16toUTF8(mLang).get(), out);
fputs("\" }\n", out);
}
#endif
// -----------------------------------------------------------
struct MappedAttrTableEntry : public PLDHashEntryHdr {
nsMappedAttributes *mAttributes;
};
static PLDHashNumber
MappedAttrTable_HashKey(PLDHashTable *table, const void *key)
{
nsMappedAttributes *attributes =
static_cast<nsMappedAttributes*>(const_cast<void*>(key));
return attributes->HashValue();
}
static void
MappedAttrTable_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
{
MappedAttrTableEntry *entry = static_cast<MappedAttrTableEntry*>(hdr);
entry->mAttributes->DropStyleSheetReference();
memset(entry, 0, sizeof(MappedAttrTableEntry));
}
static bool
MappedAttrTable_MatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
const void *key)
{
nsMappedAttributes *attributes =
static_cast<nsMappedAttributes*>(const_cast<void*>(key));
const MappedAttrTableEntry *entry =
static_cast<const MappedAttrTableEntry*>(hdr);
return attributes->Equals(entry->mAttributes);
}
static const PLDHashTableOps MappedAttrTable_Ops = {
PL_DHashAllocTable,
PL_DHashFreeTable,
MappedAttrTable_HashKey,
MappedAttrTable_MatchEntry,
PL_DHashMoveEntryStub,
MappedAttrTable_ClearEntry,
PL_DHashFinalizeStub,
nullptr
};
// -----------------------------------------------------------
struct LangRuleTableEntry : public PLDHashEntryHdr {
nsRefPtr<nsHTMLStyleSheet::LangRule> mRule;
};
static PLDHashNumber
LangRuleTable_HashKey(PLDHashTable *table, const void *key)
{
const nsString *lang = static_cast<const nsString*>(key);
return HashString(*lang);
}
static void
LangRuleTable_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
{
LangRuleTableEntry *entry = static_cast<LangRuleTableEntry*>(hdr);
entry->~LangRuleTableEntry();
memset(entry, 0, sizeof(LangRuleTableEntry));
}
static bool
LangRuleTable_MatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
const void *key)
{
const nsString *lang = static_cast<const nsString*>(key);
const LangRuleTableEntry *entry = static_cast<const LangRuleTableEntry*>(hdr);
return entry->mRule->mLang == *lang;
}
static bool
LangRuleTable_InitEntry(PLDHashTable *table, PLDHashEntryHdr *hdr,
const void *key)
{
const nsString *lang = static_cast<const nsString*>(key);
LangRuleTableEntry *entry = new (hdr) LangRuleTableEntry();
// Create the unique rule for this language
entry->mRule = new nsHTMLStyleSheet::LangRule(*lang);
return true;
}
static const PLDHashTableOps LangRuleTable_Ops = {
PL_DHashAllocTable,
PL_DHashFreeTable,
LangRuleTable_HashKey,
LangRuleTable_MatchEntry,
PL_DHashMoveEntryStub,
LangRuleTable_ClearEntry,
PL_DHashFinalizeStub,
LangRuleTable_InitEntry
};
// -----------------------------------------------------------
nsHTMLStyleSheet::nsHTMLStyleSheet(nsIDocument* aDocument)
: mDocument(aDocument)
, mTableQuirkColorRule(new TableQuirkColorRule())
, mTableTHRule(new TableTHRule())
{
MOZ_ASSERT(aDocument);
mMappedAttrTable.ops = nullptr;
mLangRuleTable.ops = nullptr;
}
nsHTMLStyleSheet::~nsHTMLStyleSheet()
{
if (mLangRuleTable.ops)
PL_DHashTableFinish(&mLangRuleTable);
if (mMappedAttrTable.ops)
PL_DHashTableFinish(&mMappedAttrTable);
}
NS_IMPL_ISUPPORTS1(nsHTMLStyleSheet, nsIStyleRuleProcessor)
/* virtual */ void
nsHTMLStyleSheet::RulesMatching(ElementRuleProcessorData* aData)
{
nsRuleWalker *ruleWalker = aData->mRuleWalker;
if (aData->mElement->IsHTML() && !ruleWalker->AuthorStyleDisabled()) {
nsIAtom* tag = aData->mElement->Tag();
// if we have anchor colors, check if this is an anchor with an href
if (tag == nsGkAtoms::a) {
if (mLinkRule || mVisitedRule || mActiveRule) {
nsEventStates state = nsCSSRuleProcessor::GetContentStateForVisitedHandling(
aData->mElement,
aData->mTreeMatchContext,
aData->mTreeMatchContext.VisitedHandling(),
// If the node being matched is a link,
// it's the relevant link.
nsCSSRuleProcessor::IsLink(aData->mElement));
if (mLinkRule && state.HasState(NS_EVENT_STATE_UNVISITED)) {
ruleWalker->Forward(mLinkRule);
aData->mTreeMatchContext.SetHaveRelevantLink();
}
else if (mVisitedRule && state.HasState(NS_EVENT_STATE_VISITED)) {
ruleWalker->Forward(mVisitedRule);
aData->mTreeMatchContext.SetHaveRelevantLink();
}
// No need to add to the active rule if it's not a link
if (mActiveRule && nsCSSRuleProcessor::IsLink(aData->mElement) &&
state.HasState(NS_EVENT_STATE_ACTIVE)) {
ruleWalker->Forward(mActiveRule);
}
} // end link/visited/active rules
} // end A tag
// add the rule to handle text-align for a <th>
else if (tag == nsGkAtoms::th) {
ruleWalker->Forward(mTableTHRule);
}
else if (tag == nsGkAtoms::table) {
if (aData->mTreeMatchContext.mCompatMode == eCompatibility_NavQuirks) {
ruleWalker->Forward(mTableQuirkColorRule);
}
}
} // end html element
// just get the style rules from the content. For SVG we do this even if
// author style is disabled, because SVG presentational hints aren't
// considered style.
if (!ruleWalker->AuthorStyleDisabled() || aData->mElement->IsSVG()) {
aData->mElement->WalkContentStyleRules(ruleWalker);
}
// http://www.whatwg.org/specs/web-apps/current-work/multipage/elements.html#language
// says that the xml:lang attribute overrides HTML's lang attribute,
// so we need to do this after WalkContentStyleRules.
nsString lang;
if (aData->mElement->GetAttr(kNameSpaceID_XML, nsGkAtoms::lang, lang)) {
ruleWalker->Forward(LangRuleFor(lang));
}
}
// Test if style is dependent on content state
/* virtual */ nsRestyleHint
nsHTMLStyleSheet::HasStateDependentStyle(StateRuleProcessorData* aData)
{
if (aData->mElement->IsHTML(nsGkAtoms::a) &&
nsCSSRuleProcessor::IsLink(aData->mElement) &&
((mActiveRule && aData->mStateMask.HasState(NS_EVENT_STATE_ACTIVE)) ||
(mLinkRule && aData->mStateMask.HasState(NS_EVENT_STATE_VISITED)) ||
(mVisitedRule && aData->mStateMask.HasState(NS_EVENT_STATE_VISITED)))) {
return eRestyle_Self;
}
return nsRestyleHint(0);
}
/* virtual */ bool
nsHTMLStyleSheet::HasDocumentStateDependentStyle(StateRuleProcessorData* aData)
{
return false;
}
/* virtual */ nsRestyleHint
nsHTMLStyleSheet::HasAttributeDependentStyle(AttributeRuleProcessorData* aData)
{
// Do nothing on before-change checks
if (!aData->mAttrHasChanged) {
return nsRestyleHint(0);
}
// Note: no need to worry about whether some states changed with this
// attribute here, because we handle that under HasStateDependentStyle() as
// needed.
// Result is true for |href| changes on HTML links if we have link rules.
Element *element = aData->mElement;
if (aData->mAttribute == nsGkAtoms::href &&
(mLinkRule || mVisitedRule || mActiveRule) &&
element->IsHTML(nsGkAtoms::a)) {
return eRestyle_Self;
}
// Don't worry about the mDocumentColorRule since it only applies
// to descendants of body, when we're already reresolving.
// Handle the content style rules.
if (element->IsAttributeMapped(aData->mAttribute)) {
// cellpadding on tables is special and requires reresolving all
// the cells in the table
if (aData->mAttribute == nsGkAtoms::cellpadding &&
element->IsHTML(nsGkAtoms::table)) {
return eRestyle_Subtree;
}
return eRestyle_Self;
}
return nsRestyleHint(0);
}
/* virtual */ bool
nsHTMLStyleSheet::MediumFeaturesChanged(nsPresContext* aPresContext)
{
return false;
}
/* virtual */ size_t
nsHTMLStyleSheet::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
return 0; // nsHTMLStyleSheets are charged to the DOM, not layout
}
/* virtual */ size_t
nsHTMLStyleSheet::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
return 0; // nsHTMLStyleSheets are charged to the DOM, not layout
}
/* virtual */ void
nsHTMLStyleSheet::RulesMatching(PseudoElementRuleProcessorData* aData)
{
}
/* virtual */ void
nsHTMLStyleSheet::RulesMatching(AnonBoxRuleProcessorData* aData)
{
}
#ifdef MOZ_XUL
/* virtual */ void
nsHTMLStyleSheet::RulesMatching(XULTreeRuleProcessorData* aData)
{
}
#endif
void
nsHTMLStyleSheet::SetOwningDocument(nsIDocument* aDocument)
{
mDocument = aDocument; // not refcounted
}
void
nsHTMLStyleSheet::Reset()
{
mLinkRule = nullptr;
mVisitedRule = nullptr;
mActiveRule = nullptr;
if (mLangRuleTable.ops) {
PL_DHashTableFinish(&mLangRuleTable);
mLangRuleTable.ops = nullptr;
}
if (mMappedAttrTable.ops) {
PL_DHashTableFinish(&mMappedAttrTable);
mMappedAttrTable.ops = nullptr;
}
}
nsresult
nsHTMLStyleSheet::ImplLinkColorSetter(nsRefPtr<HTMLColorRule>& aRule, nscolor aColor)
{
if (aRule && aRule->mColor == aColor) {
return NS_OK;
}
aRule = new HTMLColorRule();
if (!aRule)
return NS_ERROR_OUT_OF_MEMORY;
aRule->mColor = aColor;
// Now make sure we restyle any links that might need it. This
// shouldn't happen often, so just rebuilding everything is ok.
if (mDocument && mDocument->GetShell()) {
Element* root = mDocument->GetRootElement();
if (root) {
mDocument->GetShell()->GetPresContext()->RestyleManager()->
PostRestyleEvent(root, eRestyle_Subtree, NS_STYLE_HINT_NONE);
}
}
return NS_OK;
}
nsresult
nsHTMLStyleSheet::SetLinkColor(nscolor aColor)
{
return ImplLinkColorSetter(mLinkRule, aColor);
}
nsresult
nsHTMLStyleSheet::SetActiveLinkColor(nscolor aColor)
{
return ImplLinkColorSetter(mActiveRule, aColor);
}
nsresult
nsHTMLStyleSheet::SetVisitedLinkColor(nscolor aColor)
{
return ImplLinkColorSetter(mVisitedRule, aColor);
}
already_AddRefed<nsMappedAttributes>
nsHTMLStyleSheet::UniqueMappedAttributes(nsMappedAttributes* aMapped)
{
if (!mMappedAttrTable.ops) {
bool res = PL_DHashTableInit(&mMappedAttrTable, &MappedAttrTable_Ops,
nullptr, sizeof(MappedAttrTableEntry), 16);
if (!res) {
mMappedAttrTable.ops = nullptr;
return nullptr;
}
}
MappedAttrTableEntry *entry = static_cast<MappedAttrTableEntry*>
(PL_DHashTableOperate(&mMappedAttrTable, aMapped, PL_DHASH_ADD));
if (!entry)
return nullptr;
if (!entry->mAttributes) {
// We added a new entry to the hashtable, so we have a new unique set.
entry->mAttributes = aMapped;
}
nsRefPtr<nsMappedAttributes> ret = entry->mAttributes;
return ret.forget();
}
void
nsHTMLStyleSheet::DropMappedAttributes(nsMappedAttributes* aMapped)
{
NS_ENSURE_TRUE_VOID(aMapped);
NS_ASSERTION(mMappedAttrTable.ops, "table uninitialized");
#ifdef DEBUG
uint32_t entryCount = mMappedAttrTable.entryCount - 1;
#endif
PL_DHashTableOperate(&mMappedAttrTable, aMapped, PL_DHASH_REMOVE);
NS_ASSERTION(entryCount == mMappedAttrTable.entryCount, "not removed");
}
nsIStyleRule*
nsHTMLStyleSheet::LangRuleFor(const nsString& aLanguage)
{
if (!mLangRuleTable.ops) {
bool res = PL_DHashTableInit(&mLangRuleTable, &LangRuleTable_Ops,
nullptr, sizeof(LangRuleTableEntry), 16);
if (!res) {
NS_ASSERTION(false, "out of memory");
mLangRuleTable.ops = nullptr;
return nullptr;
}
}
LangRuleTableEntry *entry = static_cast<LangRuleTableEntry*>
(PL_DHashTableOperate(&mLangRuleTable, &aLanguage, PL_DHASH_ADD));
if (!entry) {
NS_ASSERTION(false, "out of memory");
return nullptr;
}
return entry->mRule;
}
static size_t
SizeOfAttributesEntryExcludingThis(PLDHashEntryHdr* aEntry,
MallocSizeOf aMallocSizeOf,
void* aArg)
{
NS_PRECONDITION(aEntry, "The entry should not be null!");
MappedAttrTableEntry* entry = static_cast<MappedAttrTableEntry*>(aEntry);
NS_ASSERTION(entry->mAttributes, "entry->mAttributes should not be null!");
return entry->mAttributes->SizeOfIncludingThis(aMallocSizeOf);
}
size_t
nsHTMLStyleSheet::DOMSizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
if (mMappedAttrTable.ops) {
n += PL_DHashTableSizeOfExcludingThis(&mMappedAttrTable,
SizeOfAttributesEntryExcludingThis,
aMallocSizeOf);
}
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - mURL
// - mLinkRule
// - mVisitedRule
// - mActiveRule
// - mTableQuirkColorRule
// - mTableTHRule
// - mLangRuleTable
//
// The following members are not measured:
// - mDocument, because it's non-owning
return n;
}
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