HTML parser: implementing throw-on-dynamic-markup-insertion counter

third_party/WebKit/Source/core/dom/ThrowOnDynamicMarkupInsertionCountIncrementer.h

+// 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.
+
+#ifndef ThrowOnDynamicMarkupInsertionCountIncrementer_h
+#define ThrowOnDynamicMarkupInsertionCountIncrementer_h
+
+#include "core/dom/Document.h"
+#include "wtf/Allocator.h"
+
+namespace blink {
+
+class ThrowOnDynamicMarkupInsertionCountIncrementer {
+    STACK_ALLOCATED();
+    WTF_MAKE_NONCOPYABLE(ThrowOnDynamicMarkupInsertionCountIncrementer);
+public:
+    explicit ThrowOnDynamicMarkupInsertionCountIncrementer(Document* document)
+        : m_count(document ? &document->m_throwOnDynamicMarkupInsertionCount : 0)
+    {
+        if (!m_count)
+            return;
+        ++(*m_count);
+    }
+
+    ~ThrowOnDynamicMarkupInsertionCountIncrementer()
+    {
+        if (!m_count)
+            return;
+        --(*m_count);
+    }
+
+private:
+    unsigned* m_count;
+};
+
+} // namespace blink
+
+#endif