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-rw-r--r--layout/base/nsStyleSheetService.cpp405
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diff --git a/layout/base/nsStyleSheetService.cpp b/layout/base/nsStyleSheetService.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/. */
+
+/* implementation of interface for managing user and user-agent style sheets */
+
+#include "nsStyleSheetService.h"
+#include "mozilla/CSSStyleSheet.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/StyleSheet.h"
+#include "mozilla/StyleSheetInlines.h"
+#include "mozilla/Unused.h"
+#include "mozilla/css/Loader.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/ipc/URIUtils.h"
+#include "nsIURI.h"
+#include "nsCOMPtr.h"
+#include "nsICategoryManager.h"
+#include "nsISupportsPrimitives.h"
+#include "nsISimpleEnumerator.h"
+#include "nsNetUtil.h"
+#include "nsIConsoleService.h"
+#include "nsIObserverService.h"
+#include "nsLayoutStatics.h"
+
+using namespace mozilla;
+
+nsStyleSheetService *nsStyleSheetService::gInstance = nullptr;
+
+nsStyleSheetService::nsStyleSheetService()
+{
+ static_assert(0 == AGENT_SHEET && 1 == USER_SHEET && 2 == AUTHOR_SHEET,
+ "Convention for Style Sheet");
+ NS_ASSERTION(!gInstance, "Someone is using CreateInstance instead of GetService");
+ gInstance = this;
+ nsLayoutStatics::AddRef();
+}
+
+nsStyleSheetService::~nsStyleSheetService()
+{
+ UnregisterWeakMemoryReporter(this);
+
+ gInstance = nullptr;
+ nsLayoutStatics::Release();
+}
+
+NS_IMPL_ISUPPORTS(
+ nsStyleSheetService, nsIStyleSheetService, nsIMemoryReporter)
+
+void
+nsStyleSheetService::RegisterFromEnumerator(nsICategoryManager *aManager,
+ const char *aCategory,
+ nsISimpleEnumerator *aEnumerator,
+ uint32_t aSheetType)
+{
+ if (!aEnumerator)
+ return;
+
+ bool hasMore;
+ while (NS_SUCCEEDED(aEnumerator->HasMoreElements(&hasMore)) && hasMore) {
+ nsCOMPtr<nsISupports> element;
+ if (NS_FAILED(aEnumerator->GetNext(getter_AddRefs(element))))
+ break;
+
+ nsCOMPtr<nsISupportsCString> icStr = do_QueryInterface(element);
+ NS_ASSERTION(icStr,
+ "category manager entries must be nsISupportsCStrings");
+
+ nsAutoCString name;
+ icStr->GetData(name);
+
+ nsXPIDLCString spec;
+ aManager->GetCategoryEntry(aCategory, name.get(), getter_Copies(spec));
+
+ nsCOMPtr<nsIURI> uri;
+ NS_NewURI(getter_AddRefs(uri), spec);
+ if (uri)
+ LoadAndRegisterSheetInternal(uri, aSheetType);
+ }
+}
+
+int32_t
+nsStyleSheetService::FindSheetByURI(const nsTArray<RefPtr<StyleSheet>>& aSheets,
+ nsIURI* aSheetURI)
+{
+ for (int32_t i = aSheets.Length() - 1; i >= 0; i-- ) {
+ bool bEqual;
+ nsIURI* uri = aSheets[i]->GetSheetURI();
+ if (uri
+ && NS_SUCCEEDED(uri->Equals(aSheetURI, &bEqual))
+ && bEqual) {
+ return i;
+ }
+ }
+
+ return -1;
+}
+
+nsresult
+nsStyleSheetService::Init()
+{
+ // If you make changes here, consider whether
+ // SVGDocument::EnsureNonSVGUserAgentStyleSheetsLoaded should be updated too.
+
+ // Child processes get their style sheets from the ContentParent.
+ if (XRE_IsContentProcess()) {
+ return NS_OK;
+ }
+
+ // Enumerate all of the style sheet URIs registered in the category
+ // manager and load them.
+
+ nsCOMPtr<nsICategoryManager> catMan =
+ do_GetService(NS_CATEGORYMANAGER_CONTRACTID);
+
+ NS_ENSURE_TRUE(catMan, NS_ERROR_OUT_OF_MEMORY);
+
+ nsCOMPtr<nsISimpleEnumerator> sheets;
+ catMan->EnumerateCategory("agent-style-sheets", getter_AddRefs(sheets));
+ RegisterFromEnumerator(catMan, "agent-style-sheets", sheets, AGENT_SHEET);
+
+ catMan->EnumerateCategory("user-style-sheets", getter_AddRefs(sheets));
+ RegisterFromEnumerator(catMan, "user-style-sheets", sheets, USER_SHEET);
+
+ catMan->EnumerateCategory("author-style-sheets", getter_AddRefs(sheets));
+ RegisterFromEnumerator(catMan, "author-style-sheets", sheets, AUTHOR_SHEET);
+
+ RegisterWeakMemoryReporter(this);
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStyleSheetService::LoadAndRegisterSheet(nsIURI *aSheetURI,
+ uint32_t aSheetType)
+{
+ // Warn developers if their stylesheet URL has a #ref at the end.
+ // Stylesheet URIs don't benefit from having a #ref suffix -- and if the
+ // sheet is a data URI, someone might've created this #ref by accident (and
+ // truncated their data-URI stylesheet) by using an unescaped # character in
+ // a #RRGGBB color or #foo() ID-selector in their data-URI representation.
+ bool hasRef;
+ nsresult rv = aSheetURI->GetHasRef(&hasRef);
+ NS_ENSURE_SUCCESS(rv, rv);
+ if (aSheetURI && hasRef) {
+ nsCOMPtr<nsIConsoleService> consoleService =
+ do_GetService(NS_CONSOLESERVICE_CONTRACTID);
+ NS_WARNING_ASSERTION(consoleService, "Failed to get console service!");
+ if (consoleService) {
+ const char16_t* message = u"nsStyleSheetService::LoadAndRegisterSheet: "
+ u"URI contains unescaped hash character, which might be truncating "
+ u"the sheet, if it's a data URI.";
+ consoleService->LogStringMessage(message);
+ }
+ }
+
+ rv = LoadAndRegisterSheetInternal(aSheetURI, aSheetType);
+ if (NS_SUCCEEDED(rv)) {
+ const char* message;
+ switch (aSheetType) {
+ case AGENT_SHEET:
+ message = "agent-sheet-added";
+ break;
+ case USER_SHEET:
+ message = "user-sheet-added";
+ break;
+ case AUTHOR_SHEET:
+ message = "author-sheet-added";
+ break;
+ default:
+ return NS_ERROR_INVALID_ARG;
+ }
+ nsCOMPtr<nsIObserverService> serv = services::GetObserverService();
+ if (serv) {
+ // We're guaranteed that the new sheet is the last sheet in
+ // mSheets[aSheetType]
+
+ // XXXheycam Once the nsStyleSheetService can hold ServoStyleSheets too,
+ // we'll need to include them in the notification.
+ StyleSheet* sheet = mSheets[aSheetType].LastElement();
+ if (sheet->IsGecko()) {
+ CSSStyleSheet* cssSheet = sheet->AsGecko();
+ serv->NotifyObservers(NS_ISUPPORTS_CAST(nsIDOMCSSStyleSheet*, cssSheet),
+ message, nullptr);
+ } else {
+ NS_ERROR("stylo: can't notify observers of ServoStyleSheets");
+ }
+ }
+
+ if (XRE_IsParentProcess()) {
+ nsTArray<dom::ContentParent*> children;
+ dom::ContentParent::GetAll(children);
+
+ if (children.IsEmpty()) {
+ return rv;
+ }
+
+ mozilla::ipc::URIParams uri;
+ SerializeURI(aSheetURI, uri);
+
+ for (uint32_t i = 0; i < children.Length(); i++) {
+ Unused << children[i]->SendLoadAndRegisterSheet(uri, aSheetType);
+ }
+ }
+ }
+ return rv;
+}
+
+nsresult
+nsStyleSheetService::LoadAndRegisterSheetInternal(nsIURI *aSheetURI,
+ uint32_t aSheetType)
+{
+ NS_ENSURE_ARG_POINTER(aSheetURI);
+
+ css::SheetParsingMode parsingMode;
+ switch (aSheetType) {
+ case AGENT_SHEET:
+ parsingMode = css::eAgentSheetFeatures;
+ break;
+
+ case USER_SHEET:
+ parsingMode = css::eUserSheetFeatures;
+ break;
+
+ case AUTHOR_SHEET:
+ parsingMode = css::eAuthorSheetFeatures;
+ break;
+
+ default:
+ NS_WARNING("invalid sheet type argument");
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ // XXXheycam We'll need to load and register both a Gecko- and Servo-backed
+ // style sheet.
+ RefPtr<css::Loader> loader = new css::Loader(StyleBackendType::Gecko);
+
+ RefPtr<StyleSheet> sheet;
+ nsresult rv = loader->LoadSheetSync(aSheetURI, parsingMode, true, &sheet);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ mSheets[aSheetType].AppendElement(sheet);
+
+ return rv;
+}
+
+NS_IMETHODIMP
+nsStyleSheetService::SheetRegistered(nsIURI *sheetURI,
+ uint32_t aSheetType, bool *_retval)
+{
+ NS_ENSURE_ARG(aSheetType == AGENT_SHEET ||
+ aSheetType == USER_SHEET ||
+ aSheetType == AUTHOR_SHEET);
+ NS_ENSURE_ARG_POINTER(sheetURI);
+ NS_PRECONDITION(_retval, "Null out param");
+
+ *_retval = (FindSheetByURI(mSheets[aSheetType], sheetURI) >= 0);
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStyleSheetService::PreloadSheet(nsIURI *aSheetURI, uint32_t aSheetType,
+ nsIDOMStyleSheet **aSheet)
+{
+ NS_PRECONDITION(aSheet, "Null out param");
+ NS_ENSURE_ARG_POINTER(aSheetURI);
+ css::SheetParsingMode parsingMode;
+ switch (aSheetType) {
+ case AGENT_SHEET:
+ parsingMode = css::eAgentSheetFeatures;
+ break;
+
+ case USER_SHEET:
+ parsingMode = css::eUserSheetFeatures;
+ break;
+
+ case AUTHOR_SHEET:
+ parsingMode = css::eAuthorSheetFeatures;
+ break;
+
+ default:
+ NS_WARNING("invalid sheet type argument");
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ // XXXheycam PreloadSheet can't support ServoStyleSheets until they implement
+ // nsIDOMStyleSheet.
+
+ RefPtr<css::Loader> loader = new css::Loader(StyleBackendType::Gecko);
+
+ RefPtr<StyleSheet> sheet;
+ nsresult rv = loader->LoadSheetSync(aSheetURI, parsingMode, true, &sheet);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ MOZ_ASSERT(sheet->IsGecko(),
+ "stylo: didn't expect Loader to create a ServoStyleSheet");
+
+ RefPtr<CSSStyleSheet> cssSheet = sheet->AsGecko();
+ cssSheet.forget(aSheet);
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStyleSheetService::UnregisterSheet(nsIURI *aSheetURI, uint32_t aSheetType)
+{
+ NS_ENSURE_ARG(aSheetType == AGENT_SHEET ||
+ aSheetType == USER_SHEET ||
+ aSheetType == AUTHOR_SHEET);
+ NS_ENSURE_ARG_POINTER(aSheetURI);
+
+ int32_t foundIndex = FindSheetByURI(mSheets[aSheetType], aSheetURI);
+ NS_ENSURE_TRUE(foundIndex >= 0, NS_ERROR_INVALID_ARG);
+ RefPtr<StyleSheet> sheet = mSheets[aSheetType][foundIndex];
+ mSheets[aSheetType].RemoveElementAt(foundIndex);
+
+ const char* message;
+ switch (aSheetType) {
+ case AGENT_SHEET:
+ message = "agent-sheet-removed";
+ break;
+ case USER_SHEET:
+ message = "user-sheet-removed";
+ break;
+ case AUTHOR_SHEET:
+ message = "author-sheet-removed";
+ break;
+ }
+
+ nsCOMPtr<nsIObserverService> serv = services::GetObserverService();
+ if (serv) {
+ // XXXheycam Once the nsStyleSheetService can hold ServoStyleSheets too,
+ // we'll need to include them in the notification.
+ if (sheet->IsGecko()) {
+ CSSStyleSheet* cssSheet = sheet->AsGecko();
+ serv->NotifyObservers(NS_ISUPPORTS_CAST(nsIDOMCSSStyleSheet*, cssSheet),
+ message, nullptr);
+ } else {
+ NS_ERROR("stylo: can't notify observers of ServoStyleSheets");
+ }
+ }
+
+ if (XRE_IsParentProcess()) {
+ nsTArray<dom::ContentParent*> children;
+ dom::ContentParent::GetAll(children);
+
+ if (children.IsEmpty()) {
+ return NS_OK;
+ }
+
+ mozilla::ipc::URIParams uri;
+ SerializeURI(aSheetURI, uri);
+
+ for (uint32_t i = 0; i < children.Length(); i++) {
+ Unused << children[i]->SendUnregisterSheet(uri, aSheetType);
+ }
+ }
+
+ return NS_OK;
+}
+
+//static
+nsStyleSheetService *
+nsStyleSheetService::GetInstance()
+{
+ static bool first = true;
+ if (first) {
+ // make sure at first call that it's inited
+ nsCOMPtr<nsIStyleSheetService> dummy =
+ do_GetService(NS_STYLESHEETSERVICE_CONTRACTID);
+ first = false;
+ }
+
+ return gInstance;
+}
+
+MOZ_DEFINE_MALLOC_SIZE_OF(StyleSheetServiceMallocSizeOf)
+
+NS_IMETHODIMP
+nsStyleSheetService::CollectReports(nsIHandleReportCallback* aHandleReport,
+ nsISupports* aData, bool aAnonymize)
+{
+ MOZ_COLLECT_REPORT(
+ "explicit/layout/style-sheet-service", KIND_HEAP, UNITS_BYTES,
+ SizeOfIncludingThis(StyleSheetServiceMallocSizeOf),
+ "Memory used for style sheets held by the style sheet service.");
+
+ return NS_OK;
+}
+
+size_t
+nsStyleSheetService::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
+{
+ size_t n = aMallocSizeOf(this);
+ for (auto& sheetArray : mSheets) {
+ n += sheetArray.ShallowSizeOfExcludingThis(aMallocSizeOf);
+ for (StyleSheet* sheet : sheetArray) {
+ n += sheet->SizeOfIncludingThis(aMallocSizeOf);
+ }
+ }
+ return n;
+}