version.cc 5.3 KB
Newer Older
gejun's avatar
gejun committed
1 2 3 4
// 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.

5
#include "butil/version.h"
gejun's avatar
gejun committed
6 7 8 9 10

#include <stddef.h>

#include <algorithm>

11 12 13 14
#include "butil/logging.h"
#include "butil/strings/string_number_conversions.h"
#include "butil/strings/string_split.h"
#include "butil/strings/string_util.h"
gejun's avatar
gejun committed
15

16
namespace butil {
gejun's avatar
gejun committed
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

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_t>* 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_t 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_t>(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_t>& components1,
                             const std::vector<uint16_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<uint16_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(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_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;
}

178
}  // namespace butil