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
14 namespace gfx {
15
Range()16 Range::Range()
17 : start_(0),
18 end_(0) {
19 }
20
Range(size_t start,size_t end)21 Range::Range(size_t start, size_t end)
22 : start_(start),
23 end_(end) {
24 }
25
Range(size_t position)26 Range::Range(size_t position)
27 : start_(position),
28 end_(position) {
29 }
30
31 // static
InvalidRange()32 const Range Range::InvalidRange() {
33 return Range(std::numeric_limits<size_t>::max());
34 }
35
IsValid() const36 bool Range::IsValid() const {
37 return *this != InvalidRange();
38 }
39
GetMin() const40 size_t Range::GetMin() const {
41 return std::min(start(), end());
42 }
43
GetMax() const44 size_t Range::GetMax() const {
45 return std::max(start(), end());
46 }
47
operator ==(const Range & other) const48 bool Range::operator==(const Range& other) const {
49 return start() == other.start() && end() == other.end();
50 }
51
operator !=(const Range & other) const52 bool Range::operator!=(const Range& other) const {
53 return !(*this == other);
54 }
55
EqualsIgnoringDirection(const Range & other) const56 bool Range::EqualsIgnoringDirection(const Range& other) const {
57 return GetMin() == other.GetMin() && GetMax() == other.GetMax();
58 }
59
Intersects(const Range & range) const60 bool Range::Intersects(const Range& range) const {
61 return IsValid() && range.IsValid() &&
62 !(range.GetMax() < GetMin() || range.GetMin() >= GetMax());
63 }
64
Contains(const Range & range) const65 bool Range::Contains(const Range& range) const {
66 return IsValid() && range.IsValid() &&
67 GetMin() <= range.GetMin() && range.GetMax() <= GetMax();
68 }
69
Intersect(const Range & range) const70 Range 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
ToString() const80 std::string Range::ToString() const {
81 return base::StringPrintf("{%" PRIuS ",%" PRIuS "}", start(), end());
82 }
83
operator <<(std::ostream & os,const Range & range)84 std::ostream& operator<<(std::ostream& os, const Range& range) {
85 return os << range.ToString();
86 }
87
88 } // namespace gfx
89