// Copyright (c) 2011 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 "ui/gfx/range/range.h"

#include <limits>

#include "base/logging.h"

namespace gfx {

Range::Range(const CHARRANGE& range, LONG total_length) {
  // Check if this is an invalid range.
  if (range.cpMin == -1 && range.cpMax == -1) {
    *this = InvalidRange();
  } else {
    DCHECK_GE(range.cpMin, 0);
    set_start(range.cpMin);
    // {0,-1} is the "whole range" but that doesn't mean much out of context,
    // so use the |total_length| parameter.
    if (range.cpMax == -1) {
      DCHECK_EQ(0, range.cpMin);
      DCHECK_NE(-1, total_length);
      set_end(total_length);
    } else {
      set_end(range.cpMax);
    }
  }
}

CHARRANGE Range::ToCHARRANGE() const {
  CHARRANGE r = { -1, -1 };
  if (!IsValid())
    return r;

  const LONG kLONGMax = std::numeric_limits<LONG>::max();
  CHECK_LE(static_cast<LONG>(start()), kLONGMax);
  CHECK_LE(static_cast<LONG>(end()), kLONGMax);
  r.cpMin = static_cast<LONG>(start());
  r.cpMax = static_cast<LONG>(end());
  return r;
}

}  // namespace gfx