Issue #1375 - Stop largely using the parser service

This is based on Bug 1395828

* Add nsHTMLElement::IsBlock()
* Rename nsHTMLTags methods
* Remove AssertParserServiceIsCorrect()
* Remove most uses of nsIParserService/nsParserService

18 files changed, 77 insertions, 193 deletions

diff --git a/dom/base/CustomElementRegistry.cpp b/dom/base/CustomElementRegistry.cpp
index 99452df650..e4d4c0670f 100644
--- a/dom/base/CustomElementRegistry.cpp
+++ b/dom/base/CustomElementRegistry.cpp
@@ -11,7 +11,7 @@
 #include "mozilla/dom/HTMLElementBinding.h"
 #include "mozilla/dom/WebComponentsBinding.h"
 #include "mozilla/dom/DocGroup.h"
-#include "nsIParserService.h"
+#include "nsHTMLTags.h"
 #include "jsapi.h"
 
 namespace mozilla {
@@ -588,14 +588,8 @@ CustomElementRegistry::Define(const nsAString& aName,
       return;
     }
 
-    nsIParserService* ps = nsContentUtils::GetParserService();
-    if (!ps) {
-      aRv.Throw(NS_ERROR_UNEXPECTED);
-      return;
-    }
-
     // bgsound and multicol are unknown html element.
-    int32_t tag = ps->HTMLCaseSensitiveAtomTagToId(extendsAtom);
+    int32_t tag = nsHTMLTags::CaseSensitiveAtomTagToId(extendsAtom);
     if (tag == eHTMLTag_userdefined ||
         tag == eHTMLTag_bgsound ||
         tag == eHTMLTag_multicol) {
diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
index f4828b162c..a68f5ef87d 100644
--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -102,6 +102,7 @@
 #include "nsHostObjectProtocolHandler.h"
 #include "nsHtml5Module.h"
 #include "nsHtml5StringParser.h"
+#include "nsHTMLTags.h"
 #include "nsIAddonPolicyService.h"
 #include "nsIAnonymousContentCreator.h"
 #include "nsIAsyncVerifyRedirectCallback.h"
@@ -501,6 +502,8 @@ nsContentUtils::Init()
     return NS_OK;
   }
 
+  nsHTMLTags::AddRefTable();
+
   sNameSpaceManager = nsNameSpaceManager::GetInstance();
   NS_ENSURE_TRUE(sNameSpaceManager, NS_ERROR_OUT_OF_MEMORY);
 
@@ -1927,6 +1930,8 @@ nsContentUtils::Shutdown()
 {
   sInitialized = false;
 
+  nsHTMLTags::ReleaseTable();
+
   NS_IF_RELEASE(sContentPolicyService);
   sTriedToGetContentPolicy = false;
   uint32_t i;
diff --git a/dom/base/nsDocument.cpp b/dom/base/nsDocument.cpp
index 130580fad1..87d860c6ae 100644
--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -116,7 +116,6 @@
 
 #include "nsBidiUtils.h"
 
-#include "nsIParserService.h"
 #include "nsContentCreatorFunctions.h"
 
 #include "nsIScriptContext.h"
diff --git a/dom/base/nsDocumentEncoder.cpp b/dom/base/nsDocumentEncoder.cpp
index de41a7331d..2f5c3dc0a3 100644
--- a/dom/base/nsDocumentEncoder.cpp
+++ b/dom/base/nsDocumentEncoder.cpp
@@ -32,7 +32,6 @@
 #include "nsIDOMDocument.h"
 #include "nsGkAtoms.h"
 #include "nsIContent.h"
-#include "nsIParserService.h"
 #include "nsIScriptContext.h"
 #include "nsIScriptGlobalObject.h"
 #include "nsIScriptSecurityManager.h"
@@ -40,6 +39,7 @@
 #include "nsISelectionPrivate.h"
 #include "nsITransferable.h" // for kUnicodeMime
 #include "nsContentUtils.h"
+#include "nsElementTable.h"
 #include "nsNodeUtils.h"
 #include "nsUnicharUtils.h"
 #include "nsReadableUtils.h"
@@ -1741,9 +1741,6 @@ nsHTMLCopyEncoder::GetPromotedPoint(Endpoint aWhere, nsIDOMNode *aNode, int32_t
       rv = GetNodeLocation(node, address_of(parent), &offset);
       NS_ENSURE_SUCCESS(rv, rv);
       if (offset == -1) return NS_OK; // we hit generated content; STOP
-      nsIParserService *parserService = nsContentUtils::GetParserService();
-      if (!parserService)
-        return NS_ERROR_OUT_OF_MEMORY;
       while ((IsFirstNode(node)) && (!IsRoot(parent)) && (parent != common))
       {
         if (bResetPromotion)
@@ -1751,11 +1748,8 @@ nsHTMLCopyEncoder::GetPromotedPoint(Endpoint aWhere, nsIDOMNode *aNode, int32_t
           nsCOMPtr<nsIContent> content = do_QueryInterface(parent);
           if (content && content->IsHTMLElement())
           {
-            bool isBlock = false;
-            parserService->IsBlock(parserService->HTMLAtomTagToId(
-                                     content->NodeInfo()->NameAtom()), isBlock);
-            if (isBlock)
-            {
+            if (nsHTMLElement::IsBlock(nsHTMLTags::AtomTagToId(
+                                       content->NodeInfo()->NameAtom()))) {
               bResetPromotion = false;
             }
           }
@@ -1824,9 +1818,6 @@ nsHTMLCopyEncoder::GetPromotedPoint(Endpoint aWhere, nsIDOMNode *aNode, int32_t
       rv = GetNodeLocation(node, address_of(parent), &offset);
       NS_ENSURE_SUCCESS(rv, rv);
       if (offset == -1) return NS_OK; // we hit generated content; STOP
-      nsIParserService *parserService = nsContentUtils::GetParserService();
-      if (!parserService)
-        return NS_ERROR_OUT_OF_MEMORY;
       while ((IsLastNode(node)) && (!IsRoot(parent)) && (parent != common))
       {
         if (bResetPromotion)
@@ -1834,11 +1825,8 @@ nsHTMLCopyEncoder::GetPromotedPoint(Endpoint aWhere, nsIDOMNode *aNode, int32_t
           nsCOMPtr<nsIContent> content = do_QueryInterface(parent);
           if (content && content->IsHTMLElement())
           {
-            bool isBlock = false;
-            parserService->IsBlock(parserService->HTMLAtomTagToId(
-                                     content->NodeInfo()->NameAtom()), isBlock);
-            if (isBlock)
-            {
+            if (nsHTMLElement::IsBlock(nsHTMLTags::AtomTagToId(
+                                       content->NodeInfo()->NameAtom()))) {
               bResetPromotion = false;
             }
           }
diff --git a/dom/base/nsHTMLContentSerializer.cpp b/dom/base/nsHTMLContentSerializer.cpp
index c135c4cf85..ea9c5a66ff 100644
--- a/dom/base/nsHTMLContentSerializer.cpp
+++ b/dom/base/nsHTMLContentSerializer.cpp
@@ -15,6 +15,7 @@
 #include "nsIDOMElement.h"
 #include "nsIContent.h"
 #include "nsIDocument.h"
+#include "nsElementTable.h"
 #include "nsNameSpaceManager.h"
 #include "nsString.h"
 #include "nsUnicharUtils.h"
@@ -347,20 +348,13 @@ nsHTMLContentSerializer::AppendElementEnd(Element* aElement,
   }
   
   if (ns == kNameSpaceID_XHTML) {
-    nsIParserService* parserService = nsContentUtils::GetParserService();
-
-    if (parserService) {
-      bool isContainer;
-
-      parserService->
-        IsContainer(parserService->HTMLCaseSensitiveAtomTagToId(name),
-                    isContainer);
-      if (!isContainer) {
-        // Keep this in sync with the cleanup at the end of this method.
-        MOZ_ASSERT(name != nsGkAtoms::body);
-        MaybeLeaveFromPreContent(content);
-        return NS_OK;
-      }
+    bool isContainer =
+      nsHTMLElement::IsContainer(nsHTMLTags::CaseSensitiveAtomTagToId(name));
+    if (!isContainer) {
+      // Keep this in sync with the cleanup at the end of this method.
+      MOZ_ASSERT(name != nsGkAtoms::body);
+      MaybeLeaveFromPreContent(content);
+      return NS_OK;
     }
   }
 
diff --git a/dom/base/nsXHTMLContentSerializer.cpp b/dom/base/nsXHTMLContentSerializer.cpp
index 0a39ef6636..aa330364b6 100755
--- a/dom/base/nsXHTMLContentSerializer.cpp
+++ b/dom/base/nsXHTMLContentSerializer.cpp
@@ -15,6 +15,7 @@
 #include "nsIDOMElement.h"
 #include "nsIContent.h"
 #include "nsIDocument.h"
+#include "nsElementTable.h"
 #include "nsNameSpaceManager.h"
 #include "nsString.h"
 #include "nsUnicharUtils.h"
@@ -27,7 +28,6 @@
 #include "nsEscape.h"
 #include "nsITextToSubURI.h"
 #include "nsCRT.h"
-#include "nsIParserService.h"
 #include "nsContentUtils.h"
 #include "nsLWBrkCIID.h"
 #include "nsIScriptElement.h"
@@ -667,18 +667,7 @@ nsXHTMLContentSerializer::LineBreakBeforeOpen(int32_t aNamespaceID, nsIAtom* aNa
       aName == nsGkAtoms::html) {
     return true;
   }
-  else {
-    nsIParserService* parserService = nsContentUtils::GetParserService();
-
-    if (parserService) {
-      bool res;
-      parserService->
-        IsBlock(parserService->HTMLCaseSensitiveAtomTagToId(aName), res);
-      return res;
-    }
-  }
-
-  return mAddSpace;
+  return nsHTMLElement::IsBlock(nsHTMLTags::CaseSensitiveAtomTagToId(aName));
 }
 
 bool
@@ -761,18 +750,7 @@ nsXHTMLContentSerializer::LineBreakAfterClose(int32_t aNamespaceID, nsIAtom* aNa
       (aName == nsGkAtoms::div)) {
     return true;
   }
-  else {
-    nsIParserService* parserService = nsContentUtils::GetParserService();
-
-    if (parserService) {
-      bool res;
-      parserService->
-        IsBlock(parserService->HTMLCaseSensitiveAtomTagToId(aName), res);
-      return res;
-    }
-  }
-
-  return false;
+  return nsHTMLElement::IsBlock(nsHTMLTags::CaseSensitiveAtomTagToId(aName));
 }
 
 
diff --git a/dom/base/nsXMLContentSerializer.cpp b/dom/base/nsXMLContentSerializer.cpp
index f12bb8fdc7..71a675e11b 100644
--- a/dom/base/nsXMLContentSerializer.cpp
+++ b/dom/base/nsXMLContentSerializer.cpp
@@ -19,7 +19,7 @@
 #include "nsIContent.h"
 #include "nsIDocument.h"
 #include "nsIDocumentEncoder.h"
-#include "nsIParserService.h"
+#include "nsElementTable.h"
 #include "nsNameSpaceManager.h"
 #include "nsTextFragment.h"
 #include "nsString.h"
@@ -994,14 +994,9 @@ ElementNeedsSeparateEndTag(Element* aElement, Element* aOriginalElement)
   // HTML container tags should have a separate end tag even if empty, per spec.
   // See
   // https://w3c.github.io/DOM-Parsing/#dfn-concept-xml-serialization-algorithm
-  bool isHTMLContainer = true; // Default in case we get no parser service.
-  nsIParserService* parserService = nsContentUtils::GetParserService();
-  if (parserService) {
-    nsIAtom* localName = aElement->NodeInfo()->NameAtom();
-    parserService->IsContainer(
-      parserService->HTMLCaseSensitiveAtomTagToId(localName),
-      isHTMLContainer);
-  }
+  nsIAtom* localName = aElement->NodeInfo()->NameAtom();
+  bool isHTMLContainer =
+    nsHTMLElement::IsContainer(nsHTMLTags::CaseSensitiveAtomTagToId(localName));
   return isHTMLContainer;
 }
 
diff --git a/dom/bindings/BindingUtils.cpp b/dom/bindings/BindingUtils.cpp
index f76f14d95f..51274f1af0 100644
--- a/dom/bindings/BindingUtils.cpp
+++ b/dom/bindings/BindingUtils.cpp
@@ -23,9 +23,9 @@
 #include "nsContentCreatorFunctions.h"
 #include "nsContentUtils.h"
 #include "nsGlobalWindow.h"
+#include "nsHTMLTags.h"
 #include "nsIDocShell.h"
 #include "nsIDOMGlobalPropertyInitializer.h"
-#include "nsIParserService.h"
 #include "nsIPermissionManager.h"
 #include "nsIPrincipal.h"
 #include "nsIXPConnect.h"
@@ -3493,13 +3493,7 @@ CreateHTMLElement(const GlobalObject& aGlobal, const JS::CallArgs& aCallArgs,
     // Step 5.
     // If the definition is for a customized built-in element, the localName
     // should be defined in the specification.
-    nsIParserService* parserService = nsContentUtils::GetParserService();
-    if (!parserService) {
-      aRv.Throw(NS_ERROR_UNEXPECTED);
-      return nullptr;
-    }
-
-    tag = parserService->HTMLCaseSensitiveAtomTagToId(definition->mLocalName);
+    tag = nsHTMLTags::CaseSensitiveAtomTagToId(definition->mLocalName);
     if (tag == eHTMLTag_userdefined) {
       aRv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
       return nullptr;
diff --git a/dom/html/nsHTMLContentSink.cpp b/dom/html/nsHTMLContentSink.cpp
index 1fe5d2a865..1c390a53ec 100644
--- a/dom/html/nsHTMLContentSink.cpp
+++ b/dom/html/nsHTMLContentSink.cpp
@@ -14,6 +14,7 @@
 
 #include "nsContentSink.h"
 #include "nsCOMPtr.h"
+#include "nsHTMLTags.h"
 #include "nsReadableUtils.h"
 #include "nsUnicharUtils.h"
 #include "nsIHTMLContentSink.h"
@@ -59,8 +60,6 @@
 #include "nsIScriptGlobalObject.h"
 #include "nsNameSpaceManager.h"
 
-#include "nsIParserService.h"
-
 #include "nsIStyleSheetLinkingElement.h"
 #include "nsITimer.h"
 #include "nsError.h"
@@ -262,10 +261,6 @@ NS_NewHTMLElement(Element** aResult, already_AddRefed<mozilla::dom::NodeInfo>&&
 
   RefPtr<mozilla::dom::NodeInfo> nodeInfo = aNodeInfo;
 
-  nsIParserService* parserService = nsContentUtils::GetParserService();
-  if (!parserService)
-    return NS_ERROR_OUT_OF_MEMORY;
-
   nsIAtom *name = nodeInfo->NameAtom();
   RefPtr<nsIAtom> tagAtom = nodeInfo->NameAtom();
   RefPtr<nsIAtom> typeAtom = aIs ? NS_Atomize(*aIs) : tagAtom;
@@ -273,7 +268,7 @@ NS_NewHTMLElement(Element** aResult, already_AddRefed<mozilla::dom::NodeInfo>&&
   NS_ASSERTION(nodeInfo->NamespaceEquals(kNameSpaceID_XHTML),
                "Trying to HTML elements that don't have the XHTML namespace");
 
-  int32_t tag = parserService->HTMLCaseSensitiveAtomTagToId(name);
+  int32_t tag = nsHTMLTags::CaseSensitiveAtomTagToId(name);
 
   bool isCustomElementName = (tag == eHTMLTag_userdefined &&
                               nsContentUtils::IsCustomElementName(name));
diff --git a/dom/xul/XULDocument.cpp b/dom/xul/XULDocument.cpp
index 1dcb55aee4..929efc1afc 100644
--- a/dom/xul/XULDocument.cpp
+++ b/dom/xul/XULDocument.cpp
@@ -66,7 +66,6 @@
 #include "nsContentUtils.h"
 #include "nsIParser.h"
 #include "nsCharsetSource.h"
-#include "nsIParserService.h"
 #include "mozilla/StyleSheetInlines.h"
 #include "mozilla/css/Loader.h"
 #include "nsIScriptError.h"
diff --git a/editor/libeditor/EditorBase.cpp b/editor/libeditor/EditorBase.cpp
index 27983df31b..3f419a74ed 100644
--- a/editor/libeditor/EditorBase.cpp
+++ b/editor/libeditor/EditorBase.cpp
@@ -107,16 +107,12 @@
 #include "prtime.h"                     // for PR_Now
 
 class nsIOutputStream;
-class nsIParserService;
 class nsITransferable;
 
 #ifdef DEBUG
 #include "nsIDOMHTMLDocument.h"         // for nsIDOMHTMLDocument
 #endif
 
-// Defined in nsEditorRegistration.cpp
-extern nsIParserService *sParserService;
-
 namespace mozilla {
 
 using namespace dom;
diff --git a/editor/libeditor/HTMLEditor.cpp b/editor/libeditor/HTMLEditor.cpp
index 766ab81cfd..04a710cde1 100644
--- a/editor/libeditor/HTMLEditor.cpp
+++ b/editor/libeditor/HTMLEditor.cpp
@@ -63,13 +63,13 @@
 #include "nsIWidget.h"
 
 #include "nsIFrame.h"
-#include "nsIParserService.h"
 #include "mozilla/dom/Selection.h"
 #include "mozilla/dom/DocumentFragment.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/dom/Event.h"
 #include "mozilla/dom/EventTarget.h"
 #include "mozilla/dom/HTMLBodyElement.h"
+#include "nsElementTable.h"
 #include "nsTextFragment.h"
 #include "nsContentList.h"
 #include "mozilla/StyleSheet.h"
@@ -690,49 +690,6 @@ HTMLEditor::HandleKeyPressEvent(nsIDOMKeyEvent* aKeyEvent)
   return TypedText(str, eTypedText);
 }
 
-static void
-AssertParserServiceIsCorrect(nsIAtom* aTag, bool aIsBlock)
-{
-#ifdef DEBUG
-  // Check this against what we would have said with the old code:
-  if (aTag == nsGkAtoms::p ||
-      aTag == nsGkAtoms::div ||
-      aTag == nsGkAtoms::blockquote ||
-      aTag == nsGkAtoms::h1 ||
-      aTag == nsGkAtoms::h2 ||
-      aTag == nsGkAtoms::h3 ||
-      aTag == nsGkAtoms::h4 ||
-      aTag == nsGkAtoms::h5 ||
-      aTag == nsGkAtoms::h6 ||
-      aTag == nsGkAtoms::ul ||
-      aTag == nsGkAtoms::ol ||
-      aTag == nsGkAtoms::dl ||
-      aTag == nsGkAtoms::noscript ||
-      aTag == nsGkAtoms::form ||
-      aTag == nsGkAtoms::hr ||
-      aTag == nsGkAtoms::table ||
-      aTag == nsGkAtoms::fieldset ||
-      aTag == nsGkAtoms::address ||
-      aTag == nsGkAtoms::col ||
-      aTag == nsGkAtoms::colgroup ||
-      aTag == nsGkAtoms::li ||
-      aTag == nsGkAtoms::dt ||
-      aTag == nsGkAtoms::dd ||
-      aTag == nsGkAtoms::legend) {
-    if (!aIsBlock) {
-      nsAutoString assertmsg (NS_LITERAL_STRING("Parser and editor disagree on blockness: "));
-
-      nsAutoString tagName;
-      aTag->ToString(tagName);
-      assertmsg.Append(tagName);
-      char* assertstr = ToNewCString(assertmsg);
-      NS_ASSERTION(aIsBlock, assertstr);
-      free(assertstr);
-    }
-  }
-#endif // DEBUG
-}
-
 /**
  * Returns true if the id represents an element of block type.
  * Can be used to determine if a new paragraph should be started.
@@ -742,8 +699,8 @@ HTMLEditor::NodeIsBlockStatic(const nsINode* aElement)
 {
   MOZ_ASSERT(aElement);
 
-  // Nodes we know we want to treat as block
-  // even though the parser says they're not:
+  // We want to treat these as block nodes even though nsHTMLElement says
+  // they're not.
   if (aElement->IsAnyOfHTMLElements(nsGkAtoms::body,
                                     nsGkAtoms::head,
                                     nsGkAtoms::tbody,
@@ -752,27 +709,13 @@ HTMLEditor::NodeIsBlockStatic(const nsINode* aElement)
                                     nsGkAtoms::tr,
                                     nsGkAtoms::th,
                                     nsGkAtoms::td,
-                                    nsGkAtoms::li,
                                     nsGkAtoms::dt,
-                                    nsGkAtoms::dd,
-                                    nsGkAtoms::pre)) {
+                                    nsGkAtoms::dd)) {
     return true;
   }
 
-  bool isBlock;
-#ifdef DEBUG
-  // XXX we can't use DebugOnly here because VC++ is stupid (bug 802884)
-  nsresult rv =
-#endif
-    nsContentUtils::GetParserService()->
-    IsBlock(nsContentUtils::GetParserService()->HTMLAtomTagToId(
-              aElement->NodeInfo()->NameAtom()),
-            isBlock);
-  MOZ_ASSERT(rv == NS_OK);
-
-  AssertParserServiceIsCorrect(aElement->NodeInfo()->NameAtom(), isBlock);
-
-  return isBlock;
+  return nsHTMLElement::IsBlock(
+    nsHTMLTags::AtomTagToId(aElement->NodeInfo()->NameAtom()));
 }
 
 nsresult
@@ -3538,17 +3481,15 @@ bool
 HTMLEditor::TagCanContainTag(nsIAtom& aParentTag,
                              nsIAtom& aChildTag)
 {
-  nsIParserService* parserService = nsContentUtils::GetParserService();
-
   int32_t childTagEnum;
   // XXX Should this handle #cdata-section too?
   if (&aChildTag == nsGkAtoms::textTagName) {
     childTagEnum = eHTMLTag_text;
   } else {
-    childTagEnum = parserService->HTMLAtomTagToId(&aChildTag);
+    childTagEnum = nsHTMLTags::AtomTagToId(&aChildTag);
   }
 
-  int32_t parentTagEnum = parserService->HTMLAtomTagToId(&aParentTag);
+  int32_t parentTagEnum = nsHTMLTags::AtomTagToId(&aParentTag);
   return HTMLEditUtils::CanContain(parentTagEnum, childTagEnum);
 }
 
@@ -3562,8 +3503,7 @@ HTMLEditor::IsContainer(nsINode* aNode)
   if (aNode->IsNodeOfType(nsINode::eTEXT)) {
     tagEnum = eHTMLTag_text;
   } else {
-    tagEnum =
-      nsContentUtils::GetParserService()->HTMLStringTagToId(aNode->NodeName());
+    tagEnum = nsHTMLTags::StringTagToId(aNode->NodeName());
   }
 
   return HTMLEditUtils::IsContainer(tagEnum);
diff --git a/parser/htmlparser/moz.build b/parser/htmlparser/moz.build
index 7e5da29a5a..3a91ae1421 100644
--- a/parser/htmlparser/moz.build
+++ b/parser/htmlparser/moz.build
@@ -15,6 +15,7 @@ XPIDL_SOURCES += [
 XPIDL_MODULE = 'htmlparser'
 
 EXPORTS += [
+    'nsElementTable.h',
     'nsHTMLTagList.h',
     'nsHTMLTags.h',
     'nsIContentSink.h',
diff --git a/parser/htmlparser/nsElementTable.cpp b/parser/htmlparser/nsElementTable.cpp
index 86fbdad861..52507a9765 100644
--- a/parser/htmlparser/nsElementTable.cpp
+++ b/parser/htmlparser/nsElementTable.cpp
@@ -174,14 +174,23 @@ const nsHTMLElement gHTMLElements[] = {
 
 /*********************************************************************************************/
 
-bool nsHTMLElement::IsContainer(eHTMLTags aChild)
+bool nsHTMLElement::IsMemberOf(int32_t aSet) const
 {
-  return !gHTMLElements[aChild].mLeaf;
+  return TestBits(aSet, mParentBits);
 }
 
-bool nsHTMLElement::IsMemberOf(int32_t aSet) const
+bool nsHTMLElement::IsContainer(eHTMLTags aId)
+{
+  return !gHTMLElements[aId].mLeaf;
+}
+
+bool nsHTMLElement::IsBlock(eHTMLTags aId)
 {
-  return TestBits(aSet,mParentBits);
+  return gHTMLElements[aId].IsMemberOf(kBlock)       ||
+         gHTMLElements[aId].IsMemberOf(kBlockEntity) ||
+         gHTMLElements[aId].IsMemberOf(kHeading)     ||
+         gHTMLElements[aId].IsMemberOf(kPreformatted)||
+         gHTMLElements[aId].IsMemberOf(kList);
 }
 
 #ifdef DEBUG
diff --git a/parser/htmlparser/nsElementTable.h b/parser/htmlparser/nsElementTable.h
index 28d2fa532b..e3479db8d1 100644
--- a/parser/htmlparser/nsElementTable.h
+++ b/parser/htmlparser/nsElementTable.h
@@ -87,6 +87,7 @@ struct nsHTMLElement {
   bool            mLeaf;
 
   static  bool    IsContainer(eHTMLTags aTag);
+  static  bool    IsBlock(eHTMLTags aTag);
 };
 
 extern const nsHTMLElement gHTMLElements[];
diff --git a/parser/htmlparser/nsHTMLTags.cpp b/parser/htmlparser/nsHTMLTags.cpp
index e98d2c4cd8..681c374897 100644
--- a/parser/htmlparser/nsHTMLTags.cpp
+++ b/parser/htmlparser/nsHTMLTags.cpp
@@ -161,7 +161,7 @@ nsHTMLTags::ReleaseTable(void)
 
 // static
 nsHTMLTag
-nsHTMLTags::LookupTag(const nsAString& aTagName)
+nsHTMLTags::StringTagToId(const nsAString& aTagName)
 {
   uint32_t length = aTagName.Length();
 
@@ -195,7 +195,7 @@ nsHTMLTags::LookupTag(const nsAString& aTagName)
 
   buf[i] = 0;
 
-  return CaseSensitiveLookupTag(buf);
+  return CaseSensitiveStringTagToId(buf);
 }
 
 #ifdef DEBUG
@@ -210,33 +210,33 @@ nsHTMLTags::TestTagTable()
      // Make sure we can find everything we are supposed to
      for (int i = 0; i < NS_HTML_TAG_MAX; ++i) {
        tag = sTagUnicodeTable[i];
-       id = LookupTag(nsDependentString(tag));
+       id = StringTagToId(nsDependentString(tag));
        NS_ASSERTION(id != eHTMLTag_userdefined, "can't find tag id");
        const char16_t* check = GetStringValue(id);
        NS_ASSERTION(0 == nsCRT::strcmp(check, tag), "can't map id back to tag");
 
        nsAutoString uname(tag);
        ToUpperCase(uname);
-       NS_ASSERTION(id == LookupTag(uname), "wrong id");
+       NS_ASSERTION(id == StringTagToId(uname), "wrong id");
 
-       NS_ASSERTION(id == CaseSensitiveLookupTag(tag), "wrong id");
+       NS_ASSERTION(id == CaseSensitiveStringTagToId(tag), "wrong id");
 
        atom = NS_Atomize(tag);
-       NS_ASSERTION(id == CaseSensitiveLookupTag(atom), "wrong id");
+       NS_ASSERTION(id == CaseSensitiveAtomTagToId(atom), "wrong id");
        NS_ASSERTION(atom == GetAtom(id), "can't map id back to atom");
      }
 
      // Make sure we don't find things that aren't there
-     id = LookupTag(NS_LITERAL_STRING("@"));
+     id = StringTagToId(NS_LITERAL_STRING("@"));
      NS_ASSERTION(id == eHTMLTag_userdefined, "found @");
-     id = LookupTag(NS_LITERAL_STRING("zzzzz"));
+     id = StringTagToId(NS_LITERAL_STRING("zzzzz"));
      NS_ASSERTION(id == eHTMLTag_userdefined, "found zzzzz");
 
      atom = NS_Atomize("@");
-     id = CaseSensitiveLookupTag(atom);
+     id = CaseSensitiveAtomTagToId(atom);
      NS_ASSERTION(id == eHTMLTag_userdefined, "found @");
      atom = NS_Atomize("zzzzz");
-     id = CaseSensitiveLookupTag(atom);
+     id = CaseSensitiveAtomTagToId(atom);
      NS_ASSERTION(id == eHTMLTag_userdefined, "found zzzzz");
 
      tag = GetStringValue((nsHTMLTag) 0);
diff --git a/parser/htmlparser/nsHTMLTags.h b/parser/htmlparser/nsHTMLTags.h
index 27a23b89fe..07d542f08a 100644
--- a/parser/htmlparser/nsHTMLTags.h
+++ b/parser/htmlparser/nsHTMLTags.h
@@ -46,8 +46,13 @@ public:
   static void ReleaseTable(void);
 
   // Functions for converting string or atom to id
-  static nsHTMLTag LookupTag(const nsAString& aTagName);
-  static nsHTMLTag CaseSensitiveLookupTag(const char16_t* aTagName)
+  static nsHTMLTag StringTagToId(const nsAString& aTagName);
+  static nsHTMLTag AtomTagToId(nsIAtom* aTagName)
+  {
+    return StringTagToId(nsDependentAtomString(aTagName));
+  }
+
+  static nsHTMLTag CaseSensitiveStringTagToId(const char16_t* aTagName)
   {
     NS_ASSERTION(gTagTable, "no lookup table, needs addref");
     NS_ASSERTION(aTagName, "null tagname!");
@@ -56,7 +61,7 @@ public:
 
     return tag ? (nsHTMLTag)NS_PTR_TO_INT32(tag) : eHTMLTag_userdefined;
   }
-  static nsHTMLTag CaseSensitiveLookupTag(nsIAtom* aTagName)
+  static nsHTMLTag CaseSensitiveAtomTagToId(nsIAtom* aTagName)
   {
     NS_ASSERTION(gTagAtomTable, "no lookup table, needs addref");
     NS_ASSERTION(aTagName, "null tagname!");
diff --git a/parser/htmlparser/nsParserService.cpp b/parser/htmlparser/nsParserService.cpp
index d89badd01d..ab5c20c70e 100644
--- a/parser/htmlparser/nsParserService.cpp
+++ b/parser/htmlparser/nsParserService.cpp
@@ -25,19 +25,19 @@ NS_IMPL_ISUPPORTS(nsParserService, nsIParserService)
 int32_t
 nsParserService::HTMLAtomTagToId(nsIAtom* aAtom) const
 {
-  return nsHTMLTags::LookupTag(nsDependentAtomString(aAtom));
+  return nsHTMLTags::StringTagToId(nsDependentAtomString(aAtom));
 }
 
 int32_t
 nsParserService::HTMLCaseSensitiveAtomTagToId(nsIAtom* aAtom) const
 {
-  return nsHTMLTags::CaseSensitiveLookupTag(aAtom);
+  return nsHTMLTags::CaseSensitiveAtomTagToId(aAtom);
 }
 
 int32_t
 nsParserService::HTMLStringTagToId(const nsAString& aTag) const
 {
-  return nsHTMLTags::LookupTag(aTag);
+  return nsHTMLTags::StringTagToId(aTag);
 }
 
 const char16_t*
@@ -84,16 +84,7 @@ nsParserService::IsContainer(int32_t aId, bool& aIsContainer) const
 NS_IMETHODIMP
 nsParserService::IsBlock(int32_t aId, bool& aIsBlock) const
 {
-  if((aId>eHTMLTag_unknown) && (aId<eHTMLTag_userdefined)) {
-    aIsBlock=((gHTMLElements[aId].IsMemberOf(kBlock))       ||
-              (gHTMLElements[aId].IsMemberOf(kBlockEntity)) ||
-              (gHTMLElements[aId].IsMemberOf(kHeading))     ||
-              (gHTMLElements[aId].IsMemberOf(kPreformatted))||
-              (gHTMLElements[aId].IsMemberOf(kList)));
-  }
-  else {
-    aIsBlock = false;
-  }
+  aIsBlock = nsHTMLElement::IsBlock((eHTMLTags)aId);
 
   return NS_OK;
 }