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- // 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 <ostream>
- #include "base/check_op.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(StringPiece 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;
- unsigned int num;
- if (!StringToUint(*it, &num))
- return false;
- // This throws out leading zeros for the first item only.
- if (it == numbers.begin() && NumberToString(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() = default;
- Version::Version(const Version& other) = default;
- Version::~Version() = default;
- Version::Version(StringPiece version_str) {
- std::vector<uint32_t> parsed;
- if (!ParseVersionNumbers(version_str, &parsed))
- return;
- components_.swap(parsed);
- }
- Version::Version(std::vector<uint32_t> components)
- : components_(std::move(components)) {}
- bool Version::IsValid() const {
- return (!components_.empty());
- }
- // static
- bool Version::IsValidWildcardString(StringPiece wildcard_string) {
- StringPiece version_string = wildcard_string;
- if (EndsWith(version_string, ".*", CompareCase::SENSITIVE))
- version_string = version_string.substr(0, version_string.size() - 2);
- Version version(version_string);
- return version.IsValid();
- }
- int Version::CompareToWildcardString(StringPiece 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;
- }
- int Version::CompareTo(const Version& other) const {
- DCHECK(IsValid());
- DCHECK(other.IsValid());
- return CompareVersionComponents(components_, other.components_);
- }
- std::string Version::GetString() const {
- if (!IsValid())
- return "invalid";
- std::string version_str;
- size_t count = components_.size();
- for (size_t i = 0; i < count - 1; ++i) {
- version_str.append(NumberToString(components_[i]));
- version_str.append(".");
- }
- version_str.append(NumberToString(components_[count - 1]));
- return version_str;
- }
- bool operator==(const Version& v1, const Version& v2) {
- return v1.CompareTo(v2) == 0;
- }
- bool operator!=(const Version& v1, const Version& v2) {
- return !(v1 == v2);
- }
- bool operator<(const Version& v1, const Version& v2) {
- return v1.CompareTo(v2) < 0;
- }
- bool operator<=(const Version& v1, const Version& v2) {
- return v1.CompareTo(v2) <= 0;
- }
- bool operator>(const Version& v1, const Version& v2) {
- return v1.CompareTo(v2) > 0;
- }
- bool operator>=(const Version& v1, const Version& v2) {
- return v1.CompareTo(v2) >= 0;
- }
- std::ostream& operator<<(std::ostream& stream, const Version& v) {
- return stream << v.GetString();
- }
- } // namespace base
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