Avoid duplicate functions/code in core/editing: computeDistance

third_party/WebKit/Source/core/editing/EditingUtilities.h

 /*
  * Copyright (C) 2004, 2006, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 400 matching lines @@
   return character == '\'' || character == rightSingleQuotationMarkCharacter ||
          character == hebrewPunctuationGershayimCharacter;
 }
 
 String stringWithRebalancedWhitespace(const String&,
                                       bool startIsStartOfParagraph,
                                       bool shouldEmitNBSPbeforeEnd);
 const String& nonBreakingSpaceString();
 
 // -------------------------------------------------------------------------
+// Distance calculation functions
+// -------------------------------------------------------------------------
+
+// If current position is at grapheme boundary, return 0; otherwise, return the
+// distance to its nearest left grapheme boundary.
+size_t computeDistanceToLeftGraphemeBoundary(const Position&);
+
+// If current position is at grapheme boundary, return 0; otherwise, return the
+// distance to its nearest right grapheme boundary.
+size_t computeDistanceToRightGraphemeBoundary(const Position&);
+
+// -------------------------------------------------------------------------
 // Events
 // -------------------------------------------------------------------------
 
 // Functions dispatch InputEvent
 const StaticRangeVector* targetRangesForInputEvent(const Node&);
 DispatchEventResult dispatchBeforeInputInsertText(
     Node*,
     const String& data,
     InputEvent::InputType = InputEvent::InputType::InsertText);
 DispatchEventResult dispatchBeforeInputEditorCommand(Node*,
                                                      InputEvent::InputType,
                                                      const StaticRangeVector*);
 DispatchEventResult dispatchBeforeInputDataTransfer(Node*,
                                                     InputEvent::InputType,
                                                     DataTransfer*);
 
 InputEvent::InputType deletionInputTypeFromTextGranularity(DeleteDirection,
                                                            TextGranularity);
 
 }  // namespace blink
 
 #endif