Bug 1574852 - part 68: Make HTMLEditRules::GetDefinitionListItemTypes() to a stack class r=m_kato

It scans children and returns whether `<dt>` and `<dd>` are found or not.
So, we can make it a stack class and makes caller pick the necessary value
with getter methods.

Differential Revision: https://phabricator.services.mozilla.com/D44461

--HG--
extra : moz-landing-system : lando

editor/libeditor/HTMLEditRules.cpp

@@ -974,11 +974,13 @@ nsresult HTMLEditRules::GetListItemState(bool* aMixed, bool* aLI, bool* aDT,
     } else if (node->IsHTMLElement(nsGkAtoms::dd)) {
       *aDD = true;
     } else if (node->IsHTMLElement(nsGkAtoms::dl)) {
+      if (*aDT && *aDD) {
+        continue;
+      }
       // need to look inside dl and see which types of items it has
-      bool bDT, bDD;
-      GetDefinitionListItemTypes(node->AsElement(), &bDT, &bDD);
-      *aDT |= bDT;
-      *aDD |= bDD;
+      DefinitionListItemScanner scanner(*node->AsElement());
+      *aDT |= scanner.DTElementFound();
+      *aDD |= scanner.DDElementFound();
     } else {
       bNonList = true;
     }
@@ -7871,24 +7873,6 @@ Element* HTMLEditor::GetDeepestEditableOnlyChildDivBlockquoteOrListElement(
   return parentElement;
 }
 
-void HTMLEditRules::GetDefinitionListItemTypes(dom::Element* aElement,
-                                               bool* aDT, bool* aDD) const {
-  MOZ_ASSERT(aElement);
-  MOZ_ASSERT(aElement->IsHTMLElement(nsGkAtoms::dl));
-  MOZ_ASSERT(aDT);
-  MOZ_ASSERT(aDD);
-
-  *aDT = *aDD = false;
-  for (nsIContent* child = aElement->GetFirstChild(); child;
-       child = child->GetNextSibling()) {
-    if (child->IsHTMLElement(nsGkAtoms::dt)) {
-      *aDT = true;
-    } else if (child->IsHTMLElement(nsGkAtoms::dd)) {
-      *aDD = true;
-    }
-  }
-}
-
 nsresult HTMLEditRules::GetParagraphFormatNodes(
     nsTArray<OwningNonNull<nsINode>>& outArrayOfNodes) {
   MOZ_ASSERT(IsEditorDataAvailable());

editor/libeditor/HTMLEditRules.h

@@ -367,8 +367,6 @@ class HTMLEditRules : public TextEditRules {
   OutdentPartOfBlock(Element& aBlockElement, nsIContent& aStartOfOutdent,
                      nsIContent& aEndOutdent, bool aIsBlockIndentedWithCSS);
 
-  void GetDefinitionListItemTypes(Element* aElement, bool* aDT,
-                                  bool* aDD) const;
   MOZ_CAN_RUN_SCRIPT
   nsresult GetParagraphFormatNodes(
       nsTArray<OwningNonNull<nsINode>>& outArrayOfNodes);

editor/libeditor/HTMLEditUtils.h

@@ -6,15 +6,13 @@
 #ifndef HTMLEditUtils_h
 #define HTMLEditUtils_h
 
-#include <stdint.h>
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/Element.h"
+#include "nsGkAtoms.h"
 
 class nsAtom;
-class nsINode;
 
 namespace mozilla {
-namespace dom {
-class Element;
-}  // namespace dom
 
 class HTMLEditUtils final {
  public:
@@ -64,6 +62,42 @@ class HTMLEditUtils final {
   static EditAction GetEditActionForAlignment(const nsAString& aAlignType);
 };
 
+/**
+ * DefinitionListItemScanner() scans given `<dl>` element's children.
+ * Then, you can check whether `<dt>` and/or `<dd>` elements are in it.
+ */
+class MOZ_STACK_CLASS DefinitionListItemScanner final {
+ public:
+  DefinitionListItemScanner() = delete;
+  explicit DefinitionListItemScanner(dom::Element& aDLElement) {
+    MOZ_ASSERT(aDLElement.IsHTMLElement(nsGkAtoms::dl));
+    for (nsIContent* child = aDLElement.GetFirstChild(); child;
+         child = child->GetNextSibling()) {
+      if (child->IsHTMLElement(nsGkAtoms::dt)) {
+        mDTFound = true;
+        if (mDDFound) {
+          break;
+        }
+        continue;
+      }
+      if (child->IsHTMLElement(nsGkAtoms::dd)) {
+        mDDFound = true;
+        if (mDTFound) {
+          break;
+        }
+        continue;
+      }
+    }
+  }
+
+  bool DTElementFound() const { return mDTFound; }
+  bool DDElementFound() const { return mDDFound; }
+
+ private:
+  bool mDTFound = false;
+  bool mDDFound = false;
+};
+
 }  // namespace mozilla
 
 #endif  // #ifndef HTMLEditUtils_h