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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 "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(IntToString(components_[i]));
version_str.append(".");
}
version_str.append(IntToString(components_[count - 1]));
return version_str;
}
} // namespace base
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