[InputEvent] Introduce |StaticRange| and use in |InputEvent::getRanges()|

third_party/WebKit/Source/core/dom/StaticRange.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.
+
+// https://discourse.wicg.io/t/proposal-staticrange-to-be-used-instead-of-range-for-new-apis/1472
+
+#include "core/dom/StaticRange.h"
+
+#include "bindings/core/v8/ExceptionState.h"
+#include "bindings/core/v8/ScriptState.h"
+#include "core/dom/Range.h"
+#include "core/frame/LocalDOMWindow.h"
+
+namespace blink {
+
+StaticRange::StaticRange(Document& document)
+    : m_ownerDocument(document)
+    , m_startContainer(nullptr)
+    , m_startOffset(0)
+    , m_endContainer(nullptr)
+    , m_endOffset(0)
+{
+}
+
+StaticRange::StaticRange(Document& document, Node* startContainer, int startOffset, Node* endContainer, int endOffset)
+    : m_ownerDocument(document)
+    , m_startContainer(startContainer)
+    , m_startOffset(startOffset)
+    , m_endContainer(endContainer)
+    , m_endOffset(endOffset)
+{
+}
+
+void StaticRange::setStart(Node* container, int offset)
+{
+    m_startContainer = container;
+    m_startOffset = offset;
+}
+
+void StaticRange::setEnd(Node* container, int offset)
+{
+    m_endContainer = container;
+    m_endOffset = offset;
+}
+
+Range* StaticRange::toRange(ExceptionState& exceptionState) const
+{
+    Range* range = Range::create(*m_ownerDocument.get());
+    // Do the offset checking.
+    range->setStart(m_startContainer, m_startOffset, exceptionState);
+    range->setEnd(m_endContainer, m_endOffset, exceptionState);
+    return range;
+}
+
+DEFINE_TRACE(StaticRange)
+{
+    visitor->trace(m_ownerDocument);
+    visitor->trace(m_startContainer);
+    visitor->trace(m_endContainer);
+}
+
+} // namespace blink