Implement spec-compliant HTMLElement.prototype.isContentEditable

third_party/WebKit/Source/core/editing/EditingUtilities.cpp

Index: third_party/WebKit/Source/core/editing/EditingUtilities.cpp
diff --git a/third_party/WebKit/Source/core/editing/EditingUtilities.cpp b/third_party/WebKit/Source/core/editing/EditingUtilities.cpp
index 742755960833b21ed25818d812686d968695b74c..8d9b53bbbf6681c6186799ae0721e7e2347f8176 100644
--- a/third_party/WebKit/Source/core/editing/EditingUtilities.cpp
+++ b/third_party/WebKit/Source/core/editing/EditingUtilities.cpp
@@ -27,6 +27,7 @@
 
 #include "core/HTMLElementFactory.h"
 #include "core/HTMLNames.h"
+#include "core/MathMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/NodeComputedStyle.h"
@@ -57,6 +58,7 @@
 #include "core/html/HTMLUListElement.h"
 #include "core/layout/LayoutObject.h"
 #include "core/layout/LayoutTableCell.h"
+#include "core/svg/SVGSVGElement.h"
 #include "wtf/Assertions.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/StringBuilder.h"
@@ -299,6 +301,39 @@ static bool isEditableToAccessibility(const Node& node, EditableLevel editableLe
     return false;
 }
 
+bool isEditingHost(const Node& node)
+{
+    if (!node.isHTMLElement())
+        return false;
+    String ceValue = toHTMLElement(node).contentEditable();
+    if (ceValue == "true" || ceValue == "plaintext-only")
+        return true;
+    if (node.document().inDesignMode() && node.document().documentElement() == &node)
+        return true;
+    return false;
+}

[yoichio, 2016/07/27 01:29:35]

If these functions are just for HTMLEelement::isContentEditable and no one
 won't use them, could you place them inside HTMLElement.cpp?
At least we need to name("isSpecedEditingHost" or something?) to avoid confusing
between existing *edit*-named functions.

+
+bool isEditable(const Node& node)
+{
+    if (isEditingHost(node))
+        return false;
+    if (node.isHTMLElement() && toHTMLElement(node).contentEditable() == "false")
+        return false;
+    if (!node.parentNode())
+        return false;
+    if (!isEditingHost(*node.parentNode()) && !isEditable(*node.parentNode()))
+        return false;
+    if (node.isHTMLElement())
+        return true;
+    if (isSVGSVGElement(node))
+        return true;
+    if (node.isElementNode() && toElement(node).hasTagName(MathMLNames::mathTag))
+        return true;
+    if (!node.isElementNode() && node.parentNode()->isHTMLElement())
+        return true;
+    return false;
+}
+
 bool isContentEditable(const Node& node)
 {
     node.document().updateStyleAndLayoutTree();