[DMC #1.9] Move DocumentMarkerListEditor to its own .h/.cpp files

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

+// 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/DocumentMarkerListEditor.h"
+
+#include "core/editing/markers/RenderedDocumentMarker.h"
+
+namespace blink {
+
+static bool StartsFurther(const Member<RenderedDocumentMarker>& lhv,
+                          const DocumentMarker* rhv) {
+  return lhv->StartOffset() < rhv->StartOffset();
+}
+
+static bool EndsBefore(size_t start_offset,
+                       const Member<RenderedDocumentMarker>& rhv) {
+  return start_offset < rhv->EndOffset();
+}
+
+static bool DoesNotOverlap(const Member<RenderedDocumentMarker>& lhv,
+                           const DocumentMarker* rhv) {
+  return lhv->EndOffset() < rhv->StartOffset();
+}
+
+// TODO(rlanday): this method was created by cutting and pasting code from
+// DocumentMarkerController::AddMarker(), it should be refactored in a future CL
+void DocumentMarkerListEditor::AddMarker(MarkerList* list,
+                                         const DocumentMarker* marker) {
+  RenderedDocumentMarker* rendered_marker =
+      RenderedDocumentMarker::Create(*marker);
+  if (list->IsEmpty() || list->back()->EndOffset() < marker->StartOffset()) {
+    list->push_back(rendered_marker);
+  } else {
+    if (marker->GetType() != DocumentMarker::kTextMatch &&
+        marker->GetType() != DocumentMarker::kComposition) {
+      MergeOverlapping(list, rendered_marker);
+    } else {
+      MarkerList::iterator pos =
+          std::lower_bound(list->begin(), list->end(), marker, StartsFurther);
+      list->insert(pos - list->begin(), rendered_marker);
+    }
+  }
+}
+
+bool DocumentMarkerListEditor::MoveMarkers(MarkerList* src_list,
+                                           int length,
+                                           MarkerList* dst_list) {
+  DCHECK_GT(length, 0);
+  bool didMoveMarker = false;
+  unsigned end_offset = length - 1;
+
+  MarkerList::iterator it;
+  for (it = src_list->begin(); it != src_list->end(); ++it) {
+    DocumentMarker& marker = **it;
+    if (marker.StartOffset() > end_offset)
+      break;
+
+    // pin the marker to the specified range and apply the shift delta
+    if (marker.EndOffset() > end_offset)
+      marker.SetEndOffset(end_offset);
+
+    DocumentMarkerListEditor::AddMarker(dst_list, &marker);
+    didMoveMarker = true;
+  }
+
+  // Remove the range of markers that were moved to dstNode
+  src_list->erase(0, it - src_list->begin());
+
+  return didMoveMarker;
+}
+
+// TODO(rlanday): this method was created by cutting and pasting code from
+// DocumentMarkerController::RemoveMarkers(), it should be refactored in a
+// future CL
+bool DocumentMarkerListEditor::RemoveMarkers(MarkerList* list,
+                                             unsigned start_offset,
+                                             int length) {
+  bool doc_dirty = false;
+  unsigned end_offset = start_offset + length;
+  MarkerList::iterator start_pos =
+      std::upper_bound(list->begin(), list->end(), start_offset, EndsBefore);
+  for (MarkerList::iterator i = start_pos; i != list->end();) {
+    DocumentMarker marker(*i->Get());
+
+    // markers are returned in order, so stop if we are now past the specified
+    // range
+    if (marker.StartOffset() >= end_offset)
+      break;
+
+    list->erase(i - list->begin());
+    doc_dirty = true;
+  }
+
+  return doc_dirty;
+}
+
+bool DocumentMarkerListEditor::ShiftMarkers(MarkerList* list,
+                                            unsigned offset,
+                                            unsigned old_length,
+                                            unsigned new_length) {
+  bool did_shift_marker = false;
+  for (MarkerList::iterator it = list->begin(); it != list->end(); ++it) {
+    RenderedDocumentMarker& marker = **it;
+    Optional<DocumentMarker::MarkerOffsets> result =
+        marker.ComputeOffsetsAfterShift(offset, old_length, new_length);
+    if (result == WTF::kNullopt) {
+      list->erase(it - list->begin());
+      --it;
+      did_shift_marker = true;
+      continue;
+    }
+
+    if (marker.StartOffset() != result.value().start_offset ||
+        marker.EndOffset() != result.value().end_offset) {
+      did_shift_marker = true;
+      marker.SetStartOffset(result.value().start_offset);
+      marker.SetEndOffset(result.value().end_offset);
+    }
+  }
+
+  return did_shift_marker;
+}
+
+void DocumentMarkerListEditor::MergeOverlapping(
+    DocumentMarkerListEditor::MarkerList* list,
+    RenderedDocumentMarker* to_insert) {
+  auto first_overlapping =
+      std::lower_bound(list->begin(), list->end(), to_insert, DoesNotOverlap);
+  size_t index = first_overlapping - list->begin();
+  list->insert(index, to_insert);
+  const auto inserted = list->begin() + index;
+  first_overlapping = inserted + 1;
+  for (const auto i = first_overlapping;
+       i != list->end() && (*i)->StartOffset() <= (*inserted)->EndOffset();) {
+    (*inserted)->SetStartOffset(
+        std::min((*inserted)->StartOffset(), (*i)->StartOffset()));
+    (*inserted)->SetEndOffset(
+        std::max((*inserted)->EndOffset(), (*i)->EndOffset()));
+    list->erase(i - list->begin());
+  }
+}
+
+}  // namespace blink