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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ui/gfx/range/range.h"
      6 
      7 #include <limits>
      8 
      9 #include "base/logging.h"
     10 
     11 namespace gfx {
     12 
     13 Range::Range(const NSRange& range) {
     14   *this = range;
     15 }
     16 
     17 Range& Range::operator=(const NSRange& range) {
     18   if (range.location == NSNotFound) {
     19     DCHECK_EQ(0U, range.length);
     20     *this = InvalidRange();
     21   } else {
     22     set_start(range.location);
     23     // Don't overflow |end_|.
     24     DCHECK_LE(range.length, std::numeric_limits<size_t>::max() - start());
     25     set_end(start() + range.length);
     26   }
     27   return *this;
     28 }
     29 
     30 NSRange Range::ToNSRange() const {
     31   if (!IsValid())
     32     return NSMakeRange(NSNotFound, 0);
     33   return NSMakeRange(GetMin(), length());
     34 }
     35 
     36 }  // namespace gfx
     37