Add SpellCheckMarkerList in preparation for DocumentMarkerController refactor

third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerList.cpp

Index: third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerList.cpp
diff --git a/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerList.cpp b/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerList.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..5853852526811fc4d1de5ffd392e6e4f87cf0852
--- /dev/null
+++ b/third_party/WebKit/Source/core/editing/markers/SpellCheckMarkerList.cpp
@@ -0,0 +1,73 @@
+// Copyright 2017 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/editing/markers/SpellCheckMarkerList.h"
+
+#include <algorithm>
+
+namespace blink {
+
+SpellCheckMarkerList::SpellCheckMarkerList(DocumentMarker::MarkerType type)
+    : m_type(type) {}
+
+DocumentMarker::MarkerType SpellCheckMarkerList::allowedMarkerType() const {
+  return m_type;
+}
+
+bool SpellCheckMarkerList::isSpellCheckMarkerList() const {
+  return true;
+}
+
+void SpellCheckMarkerList::add(DocumentMarker* marker) {
+  DCHECK(marker->type() == allowedMarkerType());
+  // Optimize case where (non-merging) markers are being added in order so we
+  // can add n markers in O(n) time instead of O(n log n)
+  if (m_markers.isEmpty() ||
+      m_markers.back()->endOffset() < marker->startOffset()) {
+    m_markers.push_back(marker);
+    return;
+  }
+
+  auto firstOverlappingIt = std::lower_bound(
+      m_markers.begin(), m_markers.end(), marker,
+      [](const Member<DocumentMarker>& lhv, const DocumentMarker* rhv) {
+        return lhv->endOffset() < rhv->startOffset();
+      });
+
+  size_t index = firstOverlappingIt - m_markers.begin();
+  m_markers.insert(index, marker);
+  auto insertedIt = m_markers.begin() + index;
+
+  unsigned newStart = marker->startOffset();
+  unsigned newEnd = marker->endOffset();
+
+  iterator it;
+  for (it = insertedIt + 1;
+       it != m_markers.end() && (*it)->startOffset() <= newEnd; ++it) {
+    newStart = std::min(newStart, (*it)->startOffset());
+    newEnd = std::max(newEnd, (*it)->endOffset());
+  }
+  m_markers.erase(index + 1, it - (insertedIt + 1));
+
+  (*insertedIt)->setStartOffset(newStart);
+  (*insertedIt)->setEndOffset(newEnd);
+}
+
+void SpellCheckMarkerList::removeMarkersForWords(const String& nodeText,
+                                                 const Vector<String>& words) {
+  // Build a second vector and swap with m_markers to avoid O(n^2) performance
+  HeapVector<Member<DocumentMarker>> newMarkerList;
+
+  for (Member<DocumentMarker> marker : m_markers) {
+    unsigned start = marker->startOffset();
+    unsigned length = marker->endOffset() - marker->startOffset();
+    String markerText = nodeText.substring(start, length);
+    if (!words.contains(markerText))
+      newMarkerList.push_back(marker);
+  }
+
+  std::swap(m_markers, newMarkerList);
+}
+
+}  // namespace blink