Implement PotentialCustomElementName

third_party/WebKit/Source/core/dom/custom/CustomElement.cpp

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/dom/custom/CustomElement.h"
+
+#include "platform/text/Character.h"
+
+namespace blink {
+
+bool CustomElement::isPotentialCustomElementName(const AtomicString& name)
+{
+    if (!name.length() || name[0] < 'a' || name[0] > 'z')
+        return false;
+
+    bool hasHyphens = false;
+    for (size_t i = 1; i < name.length(); ) {
+        UChar32 ch;
+        if (name.is8Bit())
+            ch = name[i++];
+        else
+            U16_NEXT(name.characters16(), i, name.length(), ch);
+        if (ch == '-')
+            hasHyphens = true;
+        else if (!Character::isPotentialCustomElementNameChar(ch))
+            return false;
+    }
+    return hasHyphens;
+}
+
+} // namespace blink