1// Copyright (c) 2012 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 <algorithm>
8#include <limits>
9
10#include "base/format_macros.h"
11#include "base/logging.h"
12#include "base/strings/stringprintf.h"
13
14namespace gfx {
15
16Range::Range()
17    : start_(0),
18      end_(0) {
19}
20
21Range::Range(size_t start, size_t end)
22    : start_(start),
23      end_(end) {
24}
25
26Range::Range(size_t position)
27    : start_(position),
28      end_(position) {
29}
30
31// static
32const Range Range::InvalidRange() {
33  return Range(std::numeric_limits<size_t>::max());
34}
35
36bool Range::IsValid() const {
37  return *this != InvalidRange();
38}
39
40size_t Range::GetMin() const {
41  return std::min(start(), end());
42}
43
44size_t Range::GetMax() const {
45  return std::max(start(), end());
46}
47
48bool Range::operator==(const Range& other) const {
49  return start() == other.start() && end() == other.end();
50}
51
52bool Range::operator!=(const Range& other) const {
53  return !(*this == other);
54}
55
56bool Range::EqualsIgnoringDirection(const Range& other) const {
57  return GetMin() == other.GetMin() && GetMax() == other.GetMax();
58}
59
60bool Range::Intersects(const Range& range) const {
61  return IsValid() && range.IsValid() &&
62      !(range.GetMax() < GetMin() || range.GetMin() >= GetMax());
63}
64
65bool Range::Contains(const Range& range) const {
66  return IsValid() && range.IsValid() &&
67      GetMin() <= range.GetMin() && range.GetMax() <= GetMax();
68}
69
70Range Range::Intersect(const Range& range) const {
71  size_t min = std::max(GetMin(), range.GetMin());
72  size_t max = std::min(GetMax(), range.GetMax());
73
74  if (min >= max)  // No intersection.
75    return InvalidRange();
76
77  return Range(min, max);
78}
79
80std::string Range::ToString() const {
81  return base::StringPrintf("{%" PRIuS ",%" PRIuS "}", start(), end());
82}
83
84std::ostream& operator<<(std::ostream& os, const Range& range) {
85  return os << range.ToString();
86}
87
88}  // namespace gfx
89