HTML - implement the labels attribute (follow up)

20 files changed, 87 insertions, 77 deletions

diff --git a/dom/base/Element.cpp b/dom/base/Element.cpp
index 886acc670..9ced64c0d 100644
--- a/dom/base/Element.cpp
+++ b/dom/base/Element.cpp
@@ -165,10 +165,9 @@ nsIContent::DoGetID() const
 }
 
 const nsAttrValue*
-nsIContent::DoGetClasses() const
+Element::DoGetClasses() const
 {
   MOZ_ASSERT(HasFlag(NODE_MAY_HAVE_CLASS), "Unexpected call");
-  MOZ_ASSERT(IsElement(), "Only elements can have classes");
 
   if (IsSVGElement()) {
     const nsAttrValue* animClass =
@@ -178,7 +177,7 @@ nsIContent::DoGetClasses() const
     }
   }
 
-  return AsElement()->GetParsedAttr(nsGkAtoms::_class);
+  return GetParsedAttr(nsGkAtoms::_class);
 }
 
 NS_IMETHODIMP
diff --git a/dom/base/Element.h b/dom/base/Element.h
index 5d878df60..cf1d197e2 100644
--- a/dom/base/Element.h
+++ b/dom/base/Element.h
@@ -544,6 +544,18 @@ public:
   virtual uint32_t GetAttrCount() const override;
   virtual bool IsNodeOfType(uint32_t aFlags) const override;
 
+  /**
+   * Get the class list of this element (this corresponds to the value of the
+   * class attribute).  This may be null if there are no classes, but that's not
+   * guaranteed (e.g. we could have class="").
+   */
+  const nsAttrValue* GetClasses() const {
+    if (HasFlag(NODE_MAY_HAVE_CLASS)) {
+      return DoGetClasses();
+    }
+    return nullptr;
+  }
+
 #ifdef DEBUG
   virtual void List(FILE* out = stdout, int32_t aIndent = 0) const override
   {
@@ -1372,6 +1384,12 @@ protected:
 
 private:
   /**
+   * Hook for implementing GetClasses.  This is guaranteed to only be
+   * called if the NODE_MAY_HAVE_CLASS flag is set.
+   */
+  const nsAttrValue* DoGetClasses() const;
+
+  /**
    * Get this element's client area rect in app units.
    * @return the frame's client area
    */
diff --git a/dom/base/FragmentOrElement.cpp b/dom/base/FragmentOrElement.cpp
index 3112515ff..79f6cff51 100644
--- a/dom/base/FragmentOrElement.cpp
+++ b/dom/base/FragmentOrElement.cpp
@@ -1831,7 +1831,8 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(FragmentOrElement)
     }
 
     nsAutoString classes;
-    const nsAttrValue* classAttrValue = tmp->GetClasses();
+    const nsAttrValue* classAttrValue = tmp->IsElement() ?
+      tmp->AsElement()->GetClasses() : nullptr;
     if (classAttrValue) {
       classes.AppendLiteral(" class='");
       nsAutoString classString;
diff --git a/dom/base/nsContentListDeclarations.h b/dom/base/nsContentListDeclarations.h
index db3a09036..a5e0e3691 100644
--- a/dom/base/nsContentListDeclarations.h
+++ b/dom/base/nsContentListDeclarations.h
@@ -18,6 +18,12 @@ class nsINode;
 class nsString;
 class nsAString;
 
+namespace mozilla {
+namespace dom {
+class Element;
+} // namespace dom
+} // namespace mozilla
+
 // Magic namespace id that means "match all namespaces".  This is
 // negative so it won't collide with actual namespace constants.
 #define kNameSpaceID_Wildcard INT32_MIN
@@ -26,7 +32,7 @@ class nsAString;
 // arbitrary matching algorithm.  aContent is the content that may
 // match the list, while aNamespaceID, aAtom, and aData are whatever
 // was passed to the list's constructor.
-typedef bool (*nsContentListMatchFunc)(nsIContent* aContent,
+typedef bool (*nsContentListMatchFunc)(mozilla::dom::Element* aElement,
                                        int32_t aNamespaceID,
                                        nsIAtom* aAtom,
                                        void* aData);
diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
index 1cc352685..02c6bf1de 100644
--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -6287,11 +6287,11 @@ struct ClassMatchingInfo {
 
 // static
 bool
-nsContentUtils::MatchClassNames(nsIContent* aContent, int32_t aNamespaceID,
+nsContentUtils::MatchClassNames(Element* aElement, int32_t aNamespaceID,
                                 nsIAtom* aAtom, void* aData)
 {
   // We can't match if there are no class names
-  const nsAttrValue* classAttr = aContent->GetClasses();
+  const nsAttrValue* classAttr = aElement->GetClasses();
   if (!classAttr) {
     return false;
   }
diff --git a/dom/base/nsContentUtils.h b/dom/base/nsContentUtils.h
index f688eeecf..0a293d73e 100644
--- a/dom/base/nsContentUtils.h
+++ b/dom/base/nsContentUtils.h
@@ -2753,7 +2753,8 @@ private:
 
   static void DropFragmentParsers();
 
-  static bool MatchClassNames(nsIContent* aContent, int32_t aNamespaceID,
+  static bool MatchClassNames(mozilla::dom::Element* aElement,
+                              int32_t aNamespaceID,
                               nsIAtom* aAtom, void* aData);
   static void DestroyClassNameArray(void* aData);
   static void* AllocClassMatchingInfo(nsINode* aRootNode,
diff --git a/dom/base/nsIContent.h b/dom/base/nsIContent.h
index f05c47a61..405090865 100644
--- a/dom/base/nsIContent.h
+++ b/dom/base/nsIContent.h
@@ -862,18 +862,6 @@ public:
   }
 
   /**
-   * Get the class list of this content node (this corresponds to the
-   * value of the class attribute).  This may be null if there are no
-   * classes, but that's not guaranteed.
-   */
-  const nsAttrValue* GetClasses() const {
-    if (HasFlag(NODE_MAY_HAVE_CLASS)) {
-      return DoGetClasses();
-    }
-    return nullptr;
-  }
-
-  /**
    * Walk aRuleWalker over the content style rules (presentational
    * hint rules) for this content node.
    */
@@ -990,13 +978,6 @@ protected:
    */
   nsIAtom* DoGetID() const;
 
-private:
-  /**
-   * Hook for implementing GetClasses.  This is guaranteed to only be
-   * called if the NODE_MAY_HAVE_CLASS flag is set.
-   */
-  const nsAttrValue* DoGetClasses() const;
-
 public:
 #ifdef DEBUG
   /**
diff --git a/dom/html/HTMLAllCollection.cpp b/dom/html/HTMLAllCollection.cpp
index afa160e0c..6305cce31 100644
--- a/dom/html/HTMLAllCollection.cpp
+++ b/dom/html/HTMLAllCollection.cpp
@@ -8,6 +8,7 @@
 
 #include "mozilla/dom/HTMLAllCollectionBinding.h"
 #include "mozilla/dom/Nullable.h"
+#include "mozilla/dom/Element.h"
 #include "nsHTMLDocument.h"
 
 namespace mozilla {
@@ -86,14 +87,14 @@ IsAllNamedElement(nsIContent* aContent)
 }
 
 static bool
-DocAllResultMatch(nsIContent* aContent, int32_t aNamespaceID, nsIAtom* aAtom,
+DocAllResultMatch(Element* aElement, int32_t aNamespaceID, nsIAtom* aAtom,
                   void* aData)
 {
-  if (aContent->GetID() == aAtom) {
+  if (aElement->GetID() == aAtom) {
     return true;
   }
 
-  nsGenericHTMLElement* elm = nsGenericHTMLElement::FromContent(aContent);
+  nsGenericHTMLElement* elm = nsGenericHTMLElement::FromContent(aElement);
   if (!elm) {
     return false;
   }
diff --git a/dom/html/HTMLDataListElement.cpp b/dom/html/HTMLDataListElement.cpp
index d9ad4da09..5aa772645 100644
--- a/dom/html/HTMLDataListElement.cpp
+++ b/dom/html/HTMLDataListElement.cpp
@@ -35,11 +35,11 @@ NS_INTERFACE_MAP_END_INHERITING(nsGenericHTMLElement)
 NS_IMPL_ELEMENT_CLONE(HTMLDataListElement)
 
 bool
-HTMLDataListElement::MatchOptions(nsIContent* aContent, int32_t aNamespaceID,
+HTMLDataListElement::MatchOptions(Element* aElement, int32_t aNamespaceID,
                                   nsIAtom* aAtom, void* aData)
 {
-  return aContent->NodeInfo()->Equals(nsGkAtoms::option, kNameSpaceID_XHTML) &&
-         !aContent->HasAttr(kNameSpaceID_None, nsGkAtoms::disabled);
+  return aElement->NodeInfo()->Equals(nsGkAtoms::option, kNameSpaceID_XHTML) &&
+         !aElement->HasAttr(kNameSpaceID_None, nsGkAtoms::disabled);
 }
 
 } // namespace dom
diff --git a/dom/html/HTMLDataListElement.h b/dom/html/HTMLDataListElement.h
index e0aff818b..ba2a2e0b4 100644
--- a/dom/html/HTMLDataListElement.h
+++ b/dom/html/HTMLDataListElement.h
@@ -37,8 +37,8 @@ public:
   virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const override;
 
   // This function is used to generate the nsContentList (option elements).
-  static bool MatchOptions(nsIContent* aContent, int32_t aNamespaceID,
-                             nsIAtom* aAtom, void* aData);
+  static bool MatchOptions(Element* aElement, int32_t aNamespaceID,
+                           nsIAtom* aAtom, void* aData);
 
   NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLDataListElement,
                                            nsGenericHTMLElement)
diff --git a/dom/html/HTMLFieldSetElement.cpp b/dom/html/HTMLFieldSetElement.cpp
index 865d3c9cf..d72fd1061 100644
--- a/dom/html/HTMLFieldSetElement.cpp
+++ b/dom/html/HTMLFieldSetElement.cpp
@@ -120,10 +120,10 @@ HTMLFieldSetElement::GetType(nsAString& aType)
 
 /* static */
 bool
-HTMLFieldSetElement::MatchListedElements(nsIContent* aContent, int32_t aNamespaceID,
+HTMLFieldSetElement::MatchListedElements(Element* aElement, int32_t aNamespaceID,
                                          nsIAtom* aAtom, void* aData)
 {
-  nsCOMPtr<nsIFormControl> formControl = do_QueryInterface(aContent);
+  nsCOMPtr<nsIFormControl> formControl = do_QueryInterface(aElement);
   return formControl;
 }
 
diff --git a/dom/html/HTMLFieldSetElement.h b/dom/html/HTMLFieldSetElement.h
index d169434ae..96fff4582 100644
--- a/dom/html/HTMLFieldSetElement.h
+++ b/dom/html/HTMLFieldSetElement.h
@@ -124,8 +124,8 @@ private:
   void NotifyElementsForFirstLegendChange(bool aNotify);
 
   // This function is used to generate the nsContentList (listed form elements).
-  static bool MatchListedElements(nsIContent* aContent, int32_t aNamespaceID,
-                                    nsIAtom* aAtom, void* aData);
+  static bool MatchListedElements(Element* aElement, int32_t aNamespaceID,
+                                  nsIAtom* aAtom, void* aData);
 
   // listed form controls elements.
   RefPtr<nsContentList> mElements;
diff --git a/dom/html/HTMLSelectElement.cpp b/dom/html/HTMLSelectElement.cpp
index 24ddabb65..53f42317a 100644
--- a/dom/html/HTMLSelectElement.cpp
+++ b/dom/html/HTMLSelectElement.cpp
@@ -735,12 +735,12 @@ HTMLSelectElement::SetLength(uint32_t aLength, ErrorResult& aRv)
 
 /* static */
 bool
-HTMLSelectElement::MatchSelectedOptions(nsIContent* aContent,
+HTMLSelectElement::MatchSelectedOptions(Element* aElement,
                                         int32_t /* unused */,
                                         nsIAtom* /* unused */,
                                         void* /* unused*/)
 {
-  HTMLOptionElement* option = HTMLOptionElement::FromContent(aContent);
+  HTMLOptionElement* option = HTMLOptionElement::FromContent(aElement);
   return option && option->Selected();
 }
 
diff --git a/dom/html/HTMLSelectElement.h b/dom/html/HTMLSelectElement.h
index d7e4350b4..8a25385de 100644
--- a/dom/html/HTMLSelectElement.h
+++ b/dom/html/HTMLSelectElement.h
@@ -247,7 +247,7 @@ public:
     mOptions->IndexedSetter(aIndex, aOption, aRv);
   }
 
-  static bool MatchSelectedOptions(nsIContent* aContent, int32_t, nsIAtom*,
+  static bool MatchSelectedOptions(Element* aElement, int32_t, nsIAtom*,
                                    void*);
 
   nsIHTMLCollection* SelectedOptions();
diff --git a/dom/html/HTMLTableRowElement.cpp b/dom/html/HTMLTableRowElement.cpp
index 2dec9c883..ac2463400 100644
--- a/dom/html/HTMLTableRowElement.cpp
+++ b/dom/html/HTMLTableRowElement.cpp
@@ -120,10 +120,10 @@ HTMLTableRowElement::SectionRowIndex() const
 }
 
 static bool
-IsCell(nsIContent *aContent, int32_t aNamespaceID,
+IsCell(Element *aElement, int32_t aNamespaceID,
        nsIAtom* aAtom, void *aData)
 {
-  return aContent->IsAnyOfHTMLElements(nsGkAtoms::td, nsGkAtoms::th);
+  return aElement->IsAnyOfHTMLElements(nsGkAtoms::td, nsGkAtoms::th);
 }
 
 nsIHTMLCollection*
diff --git a/dom/html/nsHTMLDocument.cpp b/dom/html/nsHTMLDocument.cpp
index 7d66aab04..fea78dc37 100644
--- a/dom/html/nsHTMLDocument.cpp
+++ b/dom/html/nsHTMLDocument.cpp
@@ -1100,31 +1100,31 @@ nsHTMLDocument::Applets()
 }
 
 bool
-nsHTMLDocument::MatchLinks(nsIContent *aContent, int32_t aNamespaceID,
+nsHTMLDocument::MatchLinks(Element* aElement, int32_t aNamespaceID,
                            nsIAtom* aAtom, void* aData)
 {
-  nsIDocument* doc = aContent->GetUncomposedDoc();
+  nsIDocument* doc = aElement->GetUncomposedDoc();
 
   if (doc) {
-    NS_ASSERTION(aContent->IsInUncomposedDoc(),
+    NS_ASSERTION(aElement->IsInUncomposedDoc(),
                  "This method should never be called on content nodes that "
                  "are not in a document!");
 #ifdef DEBUG
     {
       nsCOMPtr<nsIHTMLDocument> htmldoc =
-        do_QueryInterface(aContent->GetUncomposedDoc());
+        do_QueryInterface(aElement->GetUncomposedDoc());
       NS_ASSERTION(htmldoc,
                    "Huh, how did this happen? This should only be used with "
                    "HTML documents!");
     }
 #endif
 
-    mozilla::dom::NodeInfo *ni = aContent->NodeInfo();
+    mozilla::dom::NodeInfo *ni = aElement->NodeInfo();
 
     nsIAtom *localName = ni->NameAtom();
     if (ni->NamespaceID() == kNameSpaceID_XHTML &&
         (localName == nsGkAtoms::a || localName == nsGkAtoms::area)) {
-      return aContent->HasAttr(kNameSpaceID_None, nsGkAtoms::href);
+      return aElement->HasAttr(kNameSpaceID_None, nsGkAtoms::href);
     }
   }
 
@@ -1148,24 +1148,24 @@ nsHTMLDocument::Links()
 }
 
 bool
-nsHTMLDocument::MatchAnchors(nsIContent *aContent, int32_t aNamespaceID,
+nsHTMLDocument::MatchAnchors(Element* aElement, int32_t aNamespaceID,
                              nsIAtom* aAtom, void* aData)
 {
-  NS_ASSERTION(aContent->IsInUncomposedDoc(),
+  NS_ASSERTION(aElement->IsInUncomposedDoc(),
                "This method should never be called on content nodes that "
                "are not in a document!");
 #ifdef DEBUG
   {
     nsCOMPtr<nsIHTMLDocument> htmldoc =
-      do_QueryInterface(aContent->GetUncomposedDoc());
+      do_QueryInterface(aElement->GetUncomposedDoc());
     NS_ASSERTION(htmldoc,
                  "Huh, how did this happen? This should only be used with "
                  "HTML documents!");
   }
 #endif
 
-  if (aContent->NodeInfo()->Equals(nsGkAtoms::a, kNameSpaceID_XHTML)) {
-    return aContent->HasAttr(kNameSpaceID_None, nsGkAtoms::name);
+  if (aElement->IsHTMLElement(nsGkAtoms::a)) {
+    return aElement->HasAttr(kNameSpaceID_None, nsGkAtoms::name);
   }
 
   return false;
@@ -1952,14 +1952,14 @@ nsHTMLDocument::Writeln(JSContext* cx, const Sequence<nsString>& aText,
 }
 
 bool
-nsHTMLDocument::MatchNameAttribute(nsIContent* aContent, int32_t aNamespaceID,
+nsHTMLDocument::MatchNameAttribute(Element* aElement, int32_t aNamespaceID,
                                    nsIAtom* aAtom, void* aData)
 {
-  NS_PRECONDITION(aContent, "Must have content node to work with!");
+  NS_PRECONDITION(aElement, "Must have element to work with!");
   nsString* elementName = static_cast<nsString*>(aData);
   return
-    aContent->GetNameSpaceID() == kNameSpaceID_XHTML &&
-    aContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
+    aElement->GetNameSpaceID() == kNameSpaceID_XHTML &&
+    aElement->AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
                           *elementName, eCaseMatters);
 }
 
@@ -2279,10 +2279,10 @@ nsHTMLDocument::GetForms()
   return mForms;
 }
 
-static bool MatchFormControls(nsIContent* aContent, int32_t aNamespaceID,
-                                nsIAtom* aAtom, void* aData)
+static bool MatchFormControls(Element* aElement, int32_t aNamespaceID,
+                              nsIAtom* aAtom, void* aData)
 {
-  return aContent->IsNodeOfType(nsIContent::eHTML_FORM_CONTROL);
+  return aElement->IsNodeOfType(nsIContent::eHTML_FORM_CONTROL);
 }
 
 nsContentList*
diff --git a/dom/html/nsHTMLDocument.h b/dom/html/nsHTMLDocument.h
index 2dbbf2b57..426ebddc5 100644
--- a/dom/html/nsHTMLDocument.h
+++ b/dom/html/nsHTMLDocument.h
@@ -261,12 +261,13 @@ protected:
 
   nsIContent *MatchId(nsIContent *aContent, const nsAString& aId);
 
-  static bool MatchLinks(nsIContent *aContent, int32_t aNamespaceID,
+  static bool MatchLinks(mozilla::dom::Element* aElement, int32_t aNamespaceID,
+                         nsIAtom* aAtom, void* aData);
+  static bool MatchAnchors(mozilla::dom::Element* aElement, int32_t aNamespaceID,
                            nsIAtom* aAtom, void* aData);
-  static bool MatchAnchors(nsIContent *aContent, int32_t aNamespaceID,
-                             nsIAtom* aAtom, void* aData);
-  static bool MatchNameAttribute(nsIContent* aContent, int32_t aNamespaceID,
-                                   nsIAtom* aAtom, void* aData);
+  static bool MatchNameAttribute(mozilla::dom::Element* aElement,
+                                 int32_t aNamespaceID,
+                                 nsIAtom* aAtom, void* aData);
   static void* UseExistingNameString(nsINode* aRootNode, const nsString* aName);
 
   static void DocumentWriteTerminationFunc(nsISupports *aRef);
diff --git a/dom/xul/XULDocument.cpp b/dom/xul/XULDocument.cpp
index ae3cdb7eb..1dcb55aee 100644
--- a/dom/xul/XULDocument.cpp
+++ b/dom/xul/XULDocument.cpp
@@ -1919,26 +1919,26 @@ XULDocument::StartLayout(void)
 
 /* static */
 bool
-XULDocument::MatchAttribute(nsIContent* aContent,
+XULDocument::MatchAttribute(Element* aElement,
                             int32_t aNamespaceID,
                             nsIAtom* aAttrName,
                             void* aData)
 {
-    NS_PRECONDITION(aContent, "Must have content node to work with!");
+    NS_PRECONDITION(aElement, "Must have content node to work with!");
     nsString* attrValue = static_cast<nsString*>(aData);
     if (aNamespaceID != kNameSpaceID_Unknown &&
         aNamespaceID != kNameSpaceID_Wildcard) {
         return attrValue->EqualsLiteral("*") ?
-            aContent->HasAttr(aNamespaceID, aAttrName) :
-            aContent->AttrValueIs(aNamespaceID, aAttrName, *attrValue,
+            aElement->HasAttr(aNamespaceID, aAttrName) :
+            aElement->AttrValueIs(aNamespaceID, aAttrName, *attrValue,
                                   eCaseMatters);
     }
 
     // Qualified name match. This takes more work.
 
-    uint32_t count = aContent->GetAttrCount();
+    uint32_t count = aElement->GetAttrCount();
     for (uint32_t i = 0; i < count; ++i) {
-        const nsAttrName* name = aContent->GetAttrNameAt(i);
+        const nsAttrName* name = aElement->GetAttrNameAt(i);
         bool nameMatch;
         if (name->IsAtom()) {
             nameMatch = name->Atom() == aAttrName;
@@ -1950,7 +1950,7 @@ XULDocument::MatchAttribute(nsIContent* aContent,
 
         if (nameMatch) {
             return attrValue->EqualsLiteral("*") ||
-                aContent->AttrValueIs(name->NamespaceID(), name->LocalName(),
+                aElement->AttrValueIs(name->NamespaceID(), name->LocalName(),
                                       *attrValue, eCaseMatters);
         }
     }
diff --git a/dom/xul/XULDocument.h b/dom/xul/XULDocument.h
index a2f82bb89..06abb797f 100644
--- a/dom/xul/XULDocument.h
+++ b/dom/xul/XULDocument.h
@@ -180,7 +180,7 @@ public:
     NS_IMETHOD OnScriptCompileComplete(JSScript* aScript, nsresult aStatus) override;
 
     static bool
-    MatchAttribute(nsIContent* aContent,
+    MatchAttribute(Element* aContent,
                    int32_t aNameSpaceID,
                    nsIAtom* aAttrName,
                    void* aData);
diff --git a/layout/base/nsLayoutDebugger.cpp b/layout/base/nsLayoutDebugger.cpp
index 22c313c72..6ce629bc9 100644
--- a/layout/base/nsLayoutDebugger.cpp
+++ b/layout/base/nsLayoutDebugger.cpp
@@ -126,8 +126,10 @@ PrintDisplayItemTo(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem,
       contentData.AppendLiteral(" id:");
       contentData.Append(tmp);
     }
-    if (content->GetClasses()) {
-      content->GetClasses()->ToString(tmp);
+    const nsAttrValue* classes = content->IsElement() ?
+      content->AsElement()->GetClasses() : nullptr;
+    if (classes) {
+      classes->ToString(tmp);
       contentData.AppendLiteral(" class:");
       contentData.Append(tmp);
     }