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gecko-dev/layout/inspector/InspectorUtils.cpp

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/* -*- 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/. */
#include "mozilla/ArrayUtils.h"
#include "mozilla/EventStates.h"
#include "inLayoutUtils.h"
#include "gfxTextRun.h"
#include "nsArray.h"
#include "nsAutoPtr.h"
#include "nsIServiceManager.h"
#include "nsString.h"
#include "nsIStyleSheetLinkingElement.h"
#include "nsIContentInlines.h"
#include "mozilla/dom/Document.h"
#include "nsIMutableArray.h"
#include "ChildIterator.h"
#include "nsComputedDOMStyle.h"
#include "mozilla/EventStateManager.h"
#include "nsAtom.h"
#include "nsPresContext.h"
#include "nsRange.h"
#include "mozilla/PresShell.h"
#include "mozilla/PresShellInlines.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/dom/CharacterData.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/CSSStyleRule.h"
#include "mozilla/dom/InspectorUtilsBinding.h"
#include "mozilla/dom/ToJSValue.h"
#include "nsCSSProps.h"
#include "nsCSSValue.h"
#include "nsColor.h"
#include "mozilla/ServoStyleSet.h"
#include "nsStyleUtil.h"
#include "nsQueryObject.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/ServoStyleRuleMap.h"
#include "mozilla/ServoCSSParser.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/dom/InspectorUtils.h"
#include "mozilla/dom/InspectorFontFace.h"
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
namespace mozilla {
namespace dom {
/* static */
void InspectorUtils::GetAllStyleSheets(GlobalObject& aGlobalObject,
Document& aDocument, bool aDocumentOnly,
nsTArray<RefPtr<StyleSheet>>& aResult) {
// Get the agent, then user and finally xbl sheets in the style set.
PresShell* presShell = aDocument.GetPresShell();
if (presShell) {
ServoStyleSet* styleSet = presShell->StyleSet();
if (!aDocumentOnly) {
const StyleOrigin kOrigins[] = {StyleOrigin::UserAgent,
StyleOrigin::User};
for (const auto origin : kOrigins) {
for (size_t i = 0, count = styleSet->SheetCount(origin); i < count;
i++) {
aResult.AppendElement(styleSet->SheetAt(origin, i));
}
}
}
AutoTArray<StyleSheet*, 32> xblSheetArray;
styleSet->AppendAllNonDocumentAuthorSheets(xblSheetArray);
// The XBL stylesheet array will quite often be full of duplicates. Cope:
//
// FIXME(emilio, bug 1454467): I think this is not true since bug 1452525.
nsTHashtable<nsPtrHashKey<StyleSheet>> sheetSet;
for (StyleSheet* sheet : xblSheetArray) {
if (!sheetSet.Contains(sheet)) {
sheetSet.PutEntry(sheet);
aResult.AppendElement(sheet);
}
}
}
// Get the document sheets.
for (size_t i = 0; i < aDocument.SheetCount(); i++) {
aResult.AppendElement(aDocument.SheetAt(i));
}
}
bool InspectorUtils::IsIgnorableWhitespace(CharacterData& aDataNode) {
if (!aDataNode.TextIsOnlyWhitespace()) {
return false;
}
// Okay. We have only white space. Let's check the white-space
// property now and make sure that this isn't preformatted text...
if (nsIFrame* frame = aDataNode.GetPrimaryFrame()) {
return !frame->StyleText()->WhiteSpaceIsSignificant();
}
// empty inter-tag text node without frame, e.g., in between <table>\n<tr>
return true;
}
/* static */
nsINode* InspectorUtils::GetParentForNode(nsINode& aNode,
bool aShowingAnonymousContent) {
// First do the special cases -- document nodes and anonymous content
nsINode* parent = nullptr;
if (aNode.IsDocument()) {
parent = inLayoutUtils::GetContainerFor(*aNode.AsDocument());
} else if (aShowingAnonymousContent) {
if (aNode.IsContent()) {
parent = aNode.AsContent()->GetFlattenedTreeParent();
}
}
if (!parent) {
// Ok, just get the normal DOM parent node
return aNode.GetParentNode();
}
return parent;
}
/* static */
already_AddRefed<nsINodeList> InspectorUtils::GetChildrenForNode(
nsINode& aNode, bool aShowingAnonymousContent) {
nsCOMPtr<nsINodeList> kids;
if (aShowingAnonymousContent) {
if (aNode.IsContent()) {
kids = aNode.AsContent()->GetChildren(nsIContent::eAllChildren);
}
}
if (!kids) {
kids = aNode.ChildNodes();
}
return kids.forget();
}
/* static */
void InspectorUtils::GetCSSStyleRules(
GlobalObject& aGlobalObject, Element& aElement, const nsAString& aPseudo,
bool aIncludeVisitedStyle, nsTArray<RefPtr<BindingStyleRule>>& aResult) {
RefPtr<nsAtom> pseudoElt;
if (!aPseudo.IsEmpty()) {
pseudoElt = NS_Atomize(aPseudo);
}
RefPtr<ComputedStyle> computedStyle =
GetCleanComputedStyleForElement(&aElement, pseudoElt);
if (!computedStyle) {
// This can fail for elements that are not in the document or
// if the document they're in doesn't have a presshell. Bail out.
return;
}
if (aIncludeVisitedStyle) {
if (ComputedStyle* styleIfVisited = computedStyle->GetStyleIfVisited()) {
computedStyle = styleIfVisited;
}
}
Document* doc = aElement.OwnerDoc();
PresShell* presShell = doc->GetPresShell();
if (!presShell) {
return;
}
nsTArray<const RawServoStyleRule*> rawRuleList;
Servo_ComputedValues_GetStyleRuleList(computedStyle, &rawRuleList);
AutoTArray<ServoStyleRuleMap*, 1> maps;
{
ServoStyleSet* styleSet = presShell->StyleSet();
ServoStyleRuleMap* map = styleSet->StyleRuleMap();
maps.AppendElement(map);
}
// Now shadow DOM stuff...
if (auto* shadow = aElement.GetShadowRoot()) {
maps.AppendElement(&shadow->ServoStyleRuleMap());
}
for (auto* shadow = aElement.GetContainingShadow(); shadow;
shadow = shadow->Host()->GetContainingShadow()) {
maps.AppendElement(&shadow->ServoStyleRuleMap());
}
// Rules from the assigned slot.
for (auto* slot = aElement.GetAssignedSlot(); slot;
slot = slot->GetAssignedSlot()) {
if (auto* shadow = slot->GetContainingShadow()) {
maps.AppendElement(&shadow->ServoStyleRuleMap());
}
}
// Find matching rules in the table.
for (const RawServoStyleRule* rawRule : Reversed(rawRuleList)) {
CSSStyleRule* rule = nullptr;
for (ServoStyleRuleMap* map : maps) {
rule = map->Lookup(rawRule);
if (rule) {
break;
}
}
if (rule) {
aResult.AppendElement(rule);
} else {
#ifdef DEBUG
nsAutoCString str;
fprintf(stderr, "%s\n", str.get());
Servo_StyleRule_Debug(rawRule, &str);
MOZ_CRASH_UNSAFE_PRINTF(
"We should be able to map a raw rule to a rule: %s\n", str.get());
#endif
}
}
}
/* static */
uint32_t InspectorUtils::GetRuleLine(GlobalObject& aGlobal, css::Rule& aRule) {
return aRule.GetLineNumber();
}
/* static */
uint32_t InspectorUtils::GetRuleColumn(GlobalObject& aGlobal,
css::Rule& aRule) {
return aRule.GetColumnNumber();
}
/* static */
uint32_t InspectorUtils::GetRelativeRuleLine(GlobalObject& aGlobal,
css::Rule& aRule) {
uint32_t lineNumber = aRule.GetLineNumber();
// If aRule was parsed along with its stylesheet, then it will
// have an absolute lineNumber that we need to remap to its
// containing node. But if aRule was added via CSSOM after parsing,
// then it has a sort-of relative line number already:
// Gecko gives all rules a 0 lineNumber.
// Servo gives the first line of a rule a 0 lineNumber, and then
// counts up from there.
// The Servo behavior is arguably more correct, but harder to
// interpret for purposes of deciding whether a lineNumber is
// relative or absolute.
// Since most of the time, inserted rules are single line and
// therefore have 0 lineNumbers in both Gecko and Servo, we use
// that to detect that a lineNumber is already relative.
// There is one ugly edge case that we avoid: if an inserted rule
// is multi-line, then Servo will give it 0+ lineNumbers. If we
// do relative number mapping on those line numbers, we could get
// negative underflow. So we check for underflow and instead report
// a 0 lineNumber.
StyleSheet* sheet = aRule.GetStyleSheet();
if (sheet && lineNumber != 0) {
nsINode* owningNode = sheet->GetOwnerNode();
if (owningNode) {
nsCOMPtr<nsIStyleSheetLinkingElement> link =
do_QueryInterface(owningNode);
if (link) {
// Check for underflow, which is one indication that we're
// trying to remap an already relative lineNumber.
uint32_t linkLineIndex0 = link->GetLineNumber() - 1;
if (linkLineIndex0 > lineNumber) {
lineNumber = 0;
} else {
lineNumber -= linkLineIndex0;
}
}
}
}
return lineNumber;
}
/* static */
bool InspectorUtils::HasRulesModifiedByCSSOM(GlobalObject& aGlobal,
StyleSheet& aSheet) {
return aSheet.HasModifiedRules();
}
/* static */
uint32_t InspectorUtils::GetSelectorCount(GlobalObject& aGlobal,
BindingStyleRule& aRule) {
return aRule.GetSelectorCount();
}
/* static */
void InspectorUtils::GetSelectorText(GlobalObject& aGlobal,
BindingStyleRule& aRule,
uint32_t aSelectorIndex, nsString& aText,
ErrorResult& aRv) {
aRv = aRule.GetSelectorText(aSelectorIndex, aText);
}
/* static */
uint64_t InspectorUtils::GetSpecificity(GlobalObject& aGlobal,
BindingStyleRule& aRule,
uint32_t aSelectorIndex,
ErrorResult& aRv) {
uint64_t s;
aRv = aRule.GetSpecificity(aSelectorIndex, &s);
return s;
}
/* static */
bool InspectorUtils::SelectorMatchesElement(
GlobalObject& aGlobalObject, Element& aElement, BindingStyleRule& aRule,
uint32_t aSelectorIndex, const nsAString& aPseudo,
bool aRelevantLinkVisited, ErrorResult& aRv) {
bool result = false;
aRv = aRule.SelectorMatchesElement(&aElement, aSelectorIndex, aPseudo,
aRelevantLinkVisited, &result);
return result;
}
/* static */
bool InspectorUtils::IsInheritedProperty(GlobalObject& aGlobalObject,
const nsAString& aPropertyName) {
NS_ConvertUTF16toUTF8 propName(aPropertyName);
return Servo_Property_IsInherited(&propName);
}
/* static */
void InspectorUtils::GetCSSPropertyNames(GlobalObject& aGlobalObject,
const PropertyNamesOptions& aOptions,
nsTArray<nsString>& aResult) {
CSSEnabledState enabledState = aOptions.mIncludeExperimentals
? CSSEnabledState::IgnoreEnabledState
: CSSEnabledState::ForAllContent;
auto appendProperty = [enabledState, &aResult](uint32_t prop) {
nsCSSPropertyID cssProp = nsCSSPropertyID(prop);
if (nsCSSProps::IsEnabled(cssProp, enabledState)) {
aResult.AppendElement(
NS_ConvertASCIItoUTF16(nsCSSProps::GetStringValue(cssProp)));
}
};
uint32_t prop = 0;
for (; prop < eCSSProperty_COUNT_no_shorthands; ++prop) {
if (!nsCSSProps::PropHasFlags(nsCSSPropertyID(prop),
CSSPropFlags::Inaccessible)) {
appendProperty(prop);
}
}
if (aOptions.mIncludeShorthands) {
for (; prop < eCSSProperty_COUNT; ++prop) {
appendProperty(prop);
}
}
if (aOptions.mIncludeAliases) {
for (prop = eCSSProperty_COUNT; prop < eCSSProperty_COUNT_with_aliases;
++prop) {
appendProperty(prop);
}
}
}
/* static */
void InspectorUtils::GetCSSPropertyPrefs(GlobalObject& aGlobalObject,
nsTArray<PropertyPref>& aResult) {
for (const auto* src = nsCSSProps::kPropertyPrefTable;
src->mPropID != eCSSProperty_UNKNOWN; src++) {
PropertyPref& dest = *aResult.AppendElement();
dest.mName.Assign(
NS_ConvertASCIItoUTF16(nsCSSProps::GetStringValue(src->mPropID)));
dest.mPref.AssignASCII(src->mPref);
}
}
/* static */
void InspectorUtils::GetSubpropertiesForCSSProperty(GlobalObject& aGlobal,
const nsAString& aProperty,
nsTArray<nsString>& aResult,
ErrorResult& aRv) {
nsCSSPropertyID propertyID = nsCSSProps::LookupProperty(aProperty);
if (propertyID == eCSSProperty_UNKNOWN) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
if (propertyID == eCSSPropertyExtra_variable) {
aResult.AppendElement(aProperty);
return;
}
if (!nsCSSProps::IsShorthand(propertyID)) {
nsString* name = aResult.AppendElement();
CopyASCIItoUTF16(nsCSSProps::GetStringValue(propertyID), *name);
return;
}
for (const nsCSSPropertyID* props =
nsCSSProps::SubpropertyEntryFor(propertyID);
*props != eCSSProperty_UNKNOWN; ++props) {
nsString* name = aResult.AppendElement();
CopyASCIItoUTF16(nsCSSProps::GetStringValue(*props), *name);
}
}
/* static */
bool InspectorUtils::CssPropertyIsShorthand(GlobalObject& aGlobalObject,
const nsAString& aProperty,
ErrorResult& aRv) {
NS_ConvertUTF16toUTF8 prop(aProperty);
bool found;
bool isShorthand = Servo_Property_IsShorthand(&prop, &found);
if (!found) {
aRv.Throw(NS_ERROR_FAILURE);
}
return isShorthand;
}
// This should match the constants in specified_value_info.rs
//
// Once we can use bitflags in consts, we can also cbindgen that and use them
// here instead.
static uint8_t ToServoCssType(InspectorPropertyType aType) {
switch (aType) {
case InspectorPropertyType::Color:
return 1;
case InspectorPropertyType::Gradient:
return 1 << 1;
case InspectorPropertyType::Timing_function:
return 1 << 2;
default:
MOZ_ASSERT_UNREACHABLE("Unknown property type?");
return 0;
}
}
bool InspectorUtils::CssPropertySupportsType(GlobalObject& aGlobalObject,
const nsAString& aProperty,
InspectorPropertyType aType,
ErrorResult& aRv) {
NS_ConvertUTF16toUTF8 property(aProperty);
bool found;
bool result =
Servo_Property_SupportsType(&property, ToServoCssType(aType), &found);
if (!found) {
aRv.Throw(NS_ERROR_FAILURE);
return false;
}
return result;
}
/* static */
void InspectorUtils::GetCSSValuesForProperty(GlobalObject& aGlobalObject,
const nsAString& aProperty,
nsTArray<nsString>& aResult,
ErrorResult& aRv) {
NS_ConvertUTF16toUTF8 property(aProperty);
bool found;
Servo_Property_GetCSSValuesForProperty(&property, &found, &aResult);
if (!found) {
aRv.Throw(NS_ERROR_FAILURE);
}
return;
}
/* static */
void InspectorUtils::RgbToColorName(GlobalObject& aGlobalObject, uint8_t aR,
uint8_t aG, uint8_t aB,
nsAString& aColorName, ErrorResult& aRv) {
const char* color = NS_RGBToColorName(NS_RGB(aR, aG, aB));
if (!color) {
aColorName.Truncate();
aRv.Throw(NS_ERROR_INVALID_ARG);
return;
}
aColorName.AssignASCII(color);
}
/* static */
void InspectorUtils::ColorToRGBA(GlobalObject& aGlobalObject,
const nsAString& aColorString,
Nullable<InspectorRGBATuple>& aResult) {
nscolor color = NS_RGB(0, 0, 0);
if (!ServoCSSParser::ComputeColor(nullptr, NS_RGB(0, 0, 0), aColorString,
&color)) {
aResult.SetNull();
return;
}
InspectorRGBATuple& tuple = aResult.SetValue();
tuple.mR = NS_GET_R(color);
tuple.mG = NS_GET_G(color);
tuple.mB = NS_GET_B(color);
tuple.mA = nsStyleUtil::ColorComponentToFloat(NS_GET_A(color));
}
/* static */
bool InspectorUtils::IsValidCSSColor(GlobalObject& aGlobalObject,
const nsAString& aColorString) {
return ServoCSSParser::IsValidCSSColor(aColorString);
}
void InspectorUtils::GetBindingURLs(GlobalObject& aGlobalObject,
Element& aElement,
nsTArray<nsString>& aResult) {}
/* static */
bool InspectorUtils::SetContentState(GlobalObject& aGlobalObject,
Element& aElement, uint64_t aState,
ErrorResult& aRv) {
RefPtr<EventStateManager> esm =
inLayoutUtils::GetEventStateManagerFor(aElement);
EventStates state(aState);
if (!esm || !EventStateManager::ManagesState(state)) {
aRv.Throw(NS_ERROR_INVALID_ARG);
return false;
}
return esm->SetContentState(&aElement, state);
}
/* static */
bool InspectorUtils::RemoveContentState(GlobalObject& aGlobalObject,
Element& aElement, uint64_t aState,
bool aClearActiveDocument,
ErrorResult& aRv) {
RefPtr<EventStateManager> esm =
inLayoutUtils::GetEventStateManagerFor(aElement);
EventStates state(aState);
if (!esm || !EventStateManager::ManagesState(state)) {
aRv.Throw(NS_ERROR_INVALID_ARG);
return false;
}
bool result = esm->SetContentState(nullptr, state);
if (aClearActiveDocument && state == NS_EVENT_STATE_ACTIVE) {
EventStateManager* activeESM = static_cast<EventStateManager*>(
EventStateManager::GetActiveEventStateManager());
if (activeESM == esm) {
EventStateManager::ClearGlobalActiveContent(nullptr);
}
}
return result;
}
/* static */
uint64_t InspectorUtils::GetContentState(GlobalObject& aGlobalObject,
Element& aElement) {
// NOTE: if this method is removed,
// please remove GetInternalValue from EventStates
return aElement.State().GetInternalValue();
}
/* static */
already_AddRefed<ComputedStyle> InspectorUtils::GetCleanComputedStyleForElement(
dom::Element* aElement, nsAtom* aPseudo) {
MOZ_ASSERT(aElement);
Document* doc = aElement->GetComposedDoc();
if (!doc) {
return nullptr;
}
PresShell* presShell = doc->GetPresShell();
if (!presShell) {
return nullptr;
}
nsPresContext* presContext = presShell->GetPresContext();
if (!presContext) {
return nullptr;
}
presContext->EnsureSafeToHandOutCSSRules();
return nsComputedDOMStyle::GetComputedStyle(aElement, aPseudo);
}
/* static */
void InspectorUtils::GetUsedFontFaces(
GlobalObject& aGlobalObject, nsRange& aRange, uint32_t aMaxRanges,
bool aSkipCollapsedWhitespace,
nsTArray<nsAutoPtr<InspectorFontFace>>& aResult, ErrorResult& aRv) {
nsresult rv =
aRange.GetUsedFontFaces(aResult, aMaxRanges, aSkipCollapsedWhitespace);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
}
}
static EventStates GetStatesForPseudoClass(const nsAString& aStatePseudo) {
if (aStatePseudo.IsEmpty() || aStatePseudo[0] != u':') {
return EventStates();
}
NS_ConvertUTF16toUTF8 statePseudo(Substring(aStatePseudo, 1));
return EventStates(Servo_PseudoClass_GetStates(&statePseudo));
}
/* static */
void InspectorUtils::GetCSSPseudoElementNames(GlobalObject& aGlobalObject,
nsTArray<nsString>& aResult) {
const auto kPseudoCount =
static_cast<size_t>(PseudoStyleType::CSSPseudoElementsEnd);
for (size_t i = 0; i < kPseudoCount; ++i) {
PseudoStyleType type = static_cast<PseudoStyleType>(i);
if (nsCSSPseudoElements::IsEnabled(type, CSSEnabledState::ForAllContent)) {
nsAtom* atom = nsCSSPseudoElements::GetPseudoAtom(type);
aResult.AppendElement(nsDependentAtomString(atom));
}
}
}
/* static */
void InspectorUtils::AddPseudoClassLock(GlobalObject& aGlobalObject,
Element& aElement,
const nsAString& aPseudoClass,
bool aEnabled) {
EventStates state = GetStatesForPseudoClass(aPseudoClass);
if (state.IsEmpty()) {
return;
}
aElement.LockStyleStates(state, aEnabled);
}
/* static */
void InspectorUtils::RemovePseudoClassLock(GlobalObject& aGlobal,
Element& aElement,
const nsAString& aPseudoClass) {
EventStates state = GetStatesForPseudoClass(aPseudoClass);
if (state.IsEmpty()) {
return;
}
aElement.UnlockStyleStates(state);
}
/* static */
bool InspectorUtils::HasPseudoClassLock(GlobalObject& aGlobalObject,
Element& aElement,
const nsAString& aPseudoClass) {
EventStates state = GetStatesForPseudoClass(aPseudoClass);
if (state.IsEmpty()) {
return false;
}
EventStates locks = aElement.LockedStyleStates().mLocks;
return locks.HasAllStates(state);
}
/* static */
void InspectorUtils::ClearPseudoClassLocks(GlobalObject& aGlobalObject,
Element& aElement) {
aElement.ClearStyleStateLocks();
}
/* static */
void InspectorUtils::ParseStyleSheet(GlobalObject& aGlobalObject,
StyleSheet& aSheet,
const nsAString& aInput,
ErrorResult& aRv) {
aRv = aSheet.ReparseSheet(aInput);
}
bool InspectorUtils::IsCustomElementName(GlobalObject&, const nsAString& aName,
const nsAString& aNamespaceURI) {
if (aName.IsEmpty()) {
return false;
}
int32_t namespaceID;
nsContentUtils::NameSpaceManager()->RegisterNameSpace(aNamespaceURI,
namespaceID);
RefPtr<nsAtom> nameElt = NS_Atomize(aName);
return nsContentUtils::IsCustomElementName(nameElt, namespaceID);
}
/* static */
bool InspectorUtils::IsElementThemed(GlobalObject&, Element& aElement) {
// IsThemed will check if the native theme supports the widget using
// ThemeSupportsWidget which in turn will check that the widget is not
// already styled by content through nsNativeTheme::IsWidgetStyled. We
// assume that if the native theme styles the widget and the author did not
// override the appropriate styles, the theme will provide focus styling.
nsIFrame* frame = aElement.GetPrimaryFrame(FlushType::Frames);
return frame && frame->IsThemed();
}
} // namespace dom
} // namespace mozilla
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