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// Copyright (c) 2010 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/string_number_conversions.h"
#include "base/string_split.h"
#include "base/string_util.h"
#include "base/utf_string_conversions.h"
Version::Version() : is_valid_(false) {}
Version::~Version() {}
// static
Version* Version::GetVersionFromString(const std::string& version_str) {
Version* vers = new Version();
if (vers->InitFromString(version_str)) {
DCHECK(vers->is_valid_);
return vers;
}
delete vers;
return NULL;
}
Version* Version::Clone() const {
DCHECK(is_valid_);
Version* copy = new Version();
copy->components_ = components_;
copy->is_valid_ = true;
return copy;
}
bool Version::Equals(const Version& that) const {
DCHECK(is_valid_);
DCHECK(that.is_valid_);
return CompareTo(that) == 0;
}
int Version::CompareTo(const Version& other) const {
DCHECK(is_valid_);
DCHECK(other.is_valid_);
size_t count = std::min(components_.size(), other.components_.size());
for (size_t i = 0; i < count; ++i) {
if (components_[i] > other.components_[i])
return 1;
if (components_[i] < other.components_[i])
return -1;
}
if (components_.size() > other.components_.size()) {
for (size_t i = count; i < components_.size(); ++i)
if (components_[i] > 0)
return 1;
} else if (components_.size() < other.components_.size()) {
for (size_t i = count; i < other.components_.size(); ++i)
if (other.components_[i] > 0)
return -1;
}
return 0;
}
const std::string Version::GetString() const {
DCHECK(is_valid_);
std::string version_str;
size_t count = components_.size();
for (size_t i = 0; i < count - 1; ++i) {
version_str.append(base::IntToString(components_[i]));
version_str.append(".");
}
version_str.append(base::IntToString(components_[count - 1]));
return version_str;
}
bool Version::InitFromString(const std::string& version_str) {
DCHECK(!is_valid_);
std::vector<std::string> numbers;
base::SplitString(version_str, '.', &numbers);
if (numbers.empty())
return false;
for (std::vector<std::string>::iterator i = numbers.begin();
i != numbers.end(); ++i) {
int num;
if (!base::StringToInt(*i, &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 (base::IntToString(num) != *i)
return false;
uint16 component = static_cast<uint16>(num);
components_.push_back(component);
}
is_valid_ = true;
return true;
}
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