1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
// Copyright (c) 2012 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 "base/version.h"
#include <stddef.h>
#include <algorithm>
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
namespace base {
namespace {
// Parses the |numbers| vector representing the different numbers
// inside the version string and constructs a vector of valid integers. It stops
// when it reaches an invalid item (including the wildcard character). |parsed|
// is the resulting integer vector. Function returns true if all numbers were
// parsed successfully, false otherwise.
bool ParseVersionNumbers(const std::string& version_str,
std::vector<uint32_t>* parsed) {
std::vector<StringPiece> numbers =
SplitStringPiece(version_str, ".", KEEP_WHITESPACE, SPLIT_WANT_ALL);
if (numbers.empty())
return false;
for (auto it = numbers.begin(); it != numbers.end(); ++it) {
if (StartsWith(*it, "+", CompareCase::SENSITIVE))
return false;
// TODO(brettw) when we have a StringPiece version of StringToUint, delete
// this string conversion.
unsigned int num;
if (!StringToUint(*it, &num))
return false;
// This throws out leading zeros for the first item only.
if (it == numbers.begin() && UintToString(num) != *it)
return false;
// StringToUint returns unsigned int but Version fields are uint32_t.
static_assert(sizeof (uint32_t) == sizeof (unsigned int),
"uint32_t must be same as unsigned int");
parsed->push_back(num);
}
return true;
}
// Compares version components in |components1| with components in
// |components2|. Returns -1, 0 or 1 if |components1| is less than, equal to,
// or greater than |components2|, respectively.
int CompareVersionComponents(const std::vector<uint32_t>& components1,
const std::vector<uint32_t>& components2) {
const size_t count = std::min(components1.size(), components2.size());
for (size_t i = 0; i < count; ++i) {
if (components1[i] > components2[i])
return 1;
if (components1[i] < components2[i])
return -1;
}
if (components1.size() > components2.size()) {
for (size_t i = count; i < components1.size(); ++i) {
if (components1[i] > 0)
return 1;
}
} else if (components1.size() < components2.size()) {
for (size_t i = count; i < components2.size(); ++i) {
if (components2[i] > 0)
return -1;
}
}
return 0;
}
} // namespace
Version::Version() {
}
Version::~Version() {
}
Version::Version(const std::string& version_str) {
std::vector<uint32_t> parsed;
if (!ParseVersionNumbers(version_str, &parsed))
return;
components_.swap(parsed);
}
bool Version::IsValid() const {
return (!components_.empty());
}
// static
bool Version::IsValidWildcardString(const std::string& wildcard_string) {
std::string version_string = wildcard_string;
if (EndsWith(version_string, ".*", CompareCase::SENSITIVE))
version_string.resize(version_string.size() - 2);
Version version(version_string);
return version.IsValid();
}
bool Version::IsOlderThan(const std::string& version_str) const {
Version proposed_ver(version_str);
if (!proposed_ver.IsValid())
return false;
return (CompareTo(proposed_ver) < 0);
}
int Version::CompareToWildcardString(const std::string& wildcard_string) const {
DCHECK(IsValid());
DCHECK(Version::IsValidWildcardString(wildcard_string));
// Default behavior if the string doesn't end with a wildcard.
if (!EndsWith(wildcard_string, ".*", CompareCase::SENSITIVE)) {
Version version(wildcard_string);
DCHECK(version.IsValid());
return CompareTo(version);
}
std::vector<uint32_t> parsed;
const bool success = ParseVersionNumbers(
wildcard_string.substr(0, wildcard_string.length() - 2), &parsed);
DCHECK(success);
const int comparison = CompareVersionComponents(components_, parsed);
// If the version is smaller than the wildcard version's |parsed| vector,
// then the wildcard has no effect (e.g. comparing 1.2.3 and 1.3.*) and the
// version is still smaller. Same logic for equality (e.g. comparing 1.2.2 to
// 1.2.2.* is 0 regardless of the wildcard). Under this logic,
// 1.2.0.0.0.0 compared to 1.2.* is 0.
if (comparison == -1 || comparison == 0)
return comparison;
// Catch the case where the digits of |parsed| are found in |components_|,
// which means that the two are equal since |parsed| has a trailing "*".
// (e.g. 1.2.3 vs. 1.2.* will return 0). All other cases return 1 since
// components is greater (e.g. 3.2.3 vs 1.*).
DCHECK_GT(parsed.size(), 0UL);
const size_t min_num_comp = std::min(components_.size(), parsed.size());
for (size_t i = 0; i < min_num_comp; ++i) {
if (components_[i] != parsed[i])
return 1;
}
return 0;
}
bool Version::Equals(const Version& that) const {
DCHECK(IsValid());
DCHECK(that.IsValid());
return (CompareTo(that) == 0);
}
int Version::CompareTo(const Version& other) const {
DCHECK(IsValid());
DCHECK(other.IsValid());
return CompareVersionComponents(components_, other.components_);
}
const std::string Version::GetString() const {
DCHECK(IsValid());
std::string version_str;
size_t count = components_.size();
for (size_t i = 0; i < count - 1; ++i) {
version_str.append(UintToString(components_[i]));
version_str.append(".");
}
version_str.append(UintToString(components_[count - 1]));
return version_str;
}
} // namespace base
|
