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author | Zeno Albisser <zeno.albisser@digia.com> | 2013-08-15 21:46:11 +0200 |
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committer | Zeno Albisser <zeno.albisser@digia.com> | 2013-08-15 21:46:11 +0200 |
commit | 679147eead574d186ebf3069647b4c23e8ccace6 (patch) | |
tree | fc247a0ac8ff119f7c8550879ebb6d3dd8d1ff69 /chromium/base/version.cc | |
download | qtwebengine-chromium-679147eead574d186ebf3069647b4c23e8ccace6.tar.gz |
Initial import.
Diffstat (limited to 'chromium/base/version.cc')
-rw-r--r-- | chromium/base/version.cc | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/chromium/base/version.cc b/chromium/base/version.cc new file mode 100644 index 00000000000..70d35c192c2 --- /dev/null +++ b/chromium/base/version.cc @@ -0,0 +1,176 @@ +// 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 <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<uint16>* parsed) { + std::vector<std::string> numbers; + SplitString(version_str, '.', &numbers); + if (numbers.empty()) + return false; + + for (std::vector<std::string>::const_iterator it = numbers.begin(); + it != numbers.end(); ++it) { + int num; + if (!StringToInt(*it, &num)) + return false; + + if (num < 0) + return false; + + const uint16 max = 0xFFFF; + if (num > max) + return false; + + // This throws out things like +3, or 032. + if (IntToString(num) != *it) + return false; + + parsed->push_back(static_cast<uint16>(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<uint16>& components1, + const std::vector<uint16>& 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<uint16> 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(wildcard_string.c_str(), ".*", false)) + version_string = wildcard_string.substr(0, wildcard_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.c_str(), ".*", false)) { + Version version(wildcard_string); + DCHECK(version.IsValid()); + return CompareTo(version); + } + + std::vector<uint16> 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(IntToString(components_[i])); + version_str.append("."); + } + version_str.append(IntToString(components_[count - 1])); + return version_str; +} + +} // namespace base |