Add m-esr52 at 52.6.0

1 files changed, 405 insertions, 0 deletions

diff --git a/layout/base/nsStyleSheetService.cpp b/layout/base/nsStyleSheetService.cpp
new file mode 100644
index 000000000..676e46a50
--- /dev/null
+++ b/layout/base/nsStyleSheetService.cpp
@@ -0,0 +1,405 @@
+/* -*- 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;
+}