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SemanticVersion.cs
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SemanticVersion.cs
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/* Copyright 2013-present MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.Text.RegularExpressions;
namespace MongoDB.Driver.Core.Misc
{
/// <summary>
/// Represents a semantic version number.
/// </summary>
public class SemanticVersion : IEquatable<SemanticVersion>, IComparable<SemanticVersion>
{
#region static
private static void LookForPreReleaseNumericSuffix(string preRelease, out string preReleasePrefix, out int? preReleaseNumericSuffix)
{
var pattern = @"^(?<prefix>[^\d]+)(?<numericSuffix>\d+)$";
var match = Regex.Match(preRelease, pattern);
if (match.Success)
{
preReleasePrefix = match.Groups["prefix"].Value;
preReleaseNumericSuffix = int.Parse(match.Groups["numericSuffix"].Value);
}
else
{
preReleasePrefix = preRelease;
preReleaseNumericSuffix = null;
}
}
#endregion
// fields
private readonly int _major;
private readonly int _minor;
private readonly int _patch;
private readonly string _preRelease;
private readonly int? _preReleaseNumericSuffix;
private readonly string _preReleasePrefix;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="SemanticVersion"/> class.
/// </summary>
/// <param name="major">The major version.</param>
/// <param name="minor">The minor version.</param>
/// <param name="patch">The patch version.</param>
public SemanticVersion(int major, int minor, int patch)
: this(major, minor, patch, null)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="SemanticVersion"/> class.
/// </summary>
/// <param name="major">The major version.</param>
/// <param name="minor">The minor version.</param>
/// <param name="patch">The patch version.</param>
/// <param name="preRelease">The pre release version.</param>
public SemanticVersion(int major, int minor, int patch, string preRelease)
{
_major = Ensure.IsGreaterThanOrEqualToZero(major, nameof(major));
_minor = Ensure.IsGreaterThanOrEqualToZero(minor, nameof(minor));
_patch = Ensure.IsGreaterThanOrEqualToZero(patch, nameof(patch));
_preRelease = preRelease; // can be null
if (_preRelease != null)
{
LookForPreReleaseNumericSuffix(_preRelease, out _preReleasePrefix, out _preReleaseNumericSuffix);
}
}
// properties
/// <summary>
/// Gets the major version.
/// </summary>
/// <value>
/// The major version.
/// </value>
public int Major
{
get { return _major; }
}
/// <summary>
/// Gets the minor version.
/// </summary>
/// <value>
/// The minor version.
/// </value>
public int Minor
{
get { return _minor; }
}
/// <summary>
/// Gets the patch version.
/// </summary>
/// <value>
/// The patch version.
/// </value>
public int Patch
{
get { return _patch; }
}
/// <summary>
/// Gets the pre release version.
/// </summary>
/// <value>
/// The pre release version.
/// </value>
public string PreRelease
{
get { return _preRelease; }
}
// methods
/// <inheritdoc/>
public int CompareTo(SemanticVersion other)
{
if (object.ReferenceEquals(other, null))
{
return 1;
}
var result = _major.CompareTo(other._major);
if (result != 0)
{
return result;
}
result = _minor.CompareTo(other._minor);
if (result != 0)
{
return result;
}
result = _patch.CompareTo(other._patch);
if (result != 0)
{
return result;
}
if (IsInternalServerBuild() || other.IsInternalServerBuild())
{
return this.AsServerVersion().CompareTo(other.AsServerVersion());
}
result = ComparePreReleases();
if (result != 0)
{
return result;
}
return 0;
int ComparePreReleases()
{
if (_preRelease == null && other._preRelease == null)
{
return 0;
}
else if (_preRelease == null)
{
return 1;
}
else if (other._preRelease == null)
{
return -1;
}
result = _preReleasePrefix.CompareTo(other._preReleasePrefix);
if (result != 0)
{
return result;
}
if (_preReleaseNumericSuffix == null && other._preReleaseNumericSuffix == null)
{
return 0;
}
else if (_preReleaseNumericSuffix == null)
{
return -1;
}
else if (other._preReleaseNumericSuffix == null)
{
return 1;
}
return _preReleaseNumericSuffix.Value.CompareTo(other._preReleaseNumericSuffix.Value);
}
}
/// <inheritdoc/>
public override bool Equals(object obj)
{
return Equals(obj as SemanticVersion);
}
/// <inheritdoc/>
public bool Equals(SemanticVersion other)
{
return CompareTo(other) == 0;
}
/// <inheritdoc/>
public override int GetHashCode()
{
return ToString().GetHashCode();
}
/// <inheritdoc/>
public override string ToString()
{
if (_preRelease == null)
{
return string.Format("{0}.{1}.{2}", _major, _minor, _patch);
}
else
{
return string.Format("{0}.{1}.{2}-{3}", _major, _minor, _patch, _preRelease);
}
}
/// <summary>
/// Parses a string representation of a semantic version.
/// </summary>
/// <param name="value">The string value to parse.</param>
/// <returns>A semantic version.</returns>
public static SemanticVersion Parse(string value)
{
if (TryParse(value, out var result))
{
return result;
}
throw new FormatException($"Invalid SemanticVersion string: '{value}'.");
}
/// <summary>
/// Tries to parse a string representation of a semantic version.
/// </summary>
/// <param name="value">The string value to parse.</param>
/// <param name="result">The result.</param>
/// <returns>True if the string representation was parsed successfully; otherwise false.</returns>
public static bool TryParse(string value, out SemanticVersion result)
{
if (!string.IsNullOrEmpty(value))
{
var pattern = @"(?<major>\d+)\.(?<minor>\d+)(\.(?<patch>\d+)(-(?<preRelease>.*))?)?";
var match = Regex.Match((string)value, pattern);
if (match.Success)
{
var major = int.Parse(match.Groups["major"].Value);
var minor = int.Parse(match.Groups["minor"].Value);
var patch = match.Groups["patch"].Success ? int.Parse(match.Groups["patch"].Value) : 0;
var preRelease = match.Groups["preRelease"].Success ? match.Groups["preRelease"].Value : null;
result = new SemanticVersion(major, minor, patch, preRelease);
return true;
}
}
result = null;
return false;
}
/// <summary>
/// Determines whether two specified semantic versions have the same value.
/// </summary>
/// <param name="a">The first semantic version to compare, or null.</param>
/// <param name="b">The second semantic version to compare, or null.</param>
/// <returns>
/// True if the value of a is the same as the value of b; otherwise false.
/// </returns>
public static bool operator ==(SemanticVersion a, SemanticVersion b)
{
if (object.ReferenceEquals(a, null))
{
return object.ReferenceEquals(b, null);
}
return a.CompareTo(b) == 0;
}
/// <summary>
/// Determines whether two specified semantic versions have different values.
/// </summary>
/// <param name="a">The first semantic version to compare, or null.</param>
/// <param name="b">The second semantic version to compare, or null.</param>
/// <returns>
/// True if the value of a is different from the value of b; otherwise false.
/// </returns>
public static bool operator !=(SemanticVersion a, SemanticVersion b)
{
return !(a == b);
}
/// <summary>
/// Determines whether the first specified SemanticVersion is greater than the second specified SemanticVersion.
/// </summary>
/// <param name="a">The first semantic version to compare, or null.</param>
/// <param name="b">The second semantic version to compare, or null.</param>
/// <returns>
/// True if the value of a is greater than b; otherwise false.
/// </returns>
public static bool operator >(SemanticVersion a, SemanticVersion b)
{
if (object.ReferenceEquals(a, null))
{
return false;
}
return a.CompareTo(b) > 0;
}
/// <summary>
/// Determines whether the first specified SemanticVersion is greater than or equal to the second specified SemanticVersion.
/// </summary>
/// <param name="a">The first semantic version to compare, or null.</param>
/// <param name="b">The second semantic version to compare, or null.</param>
/// <returns>
/// True if the value of a is greater than or equal to b; otherwise false.
/// </returns>
public static bool operator >=(SemanticVersion a, SemanticVersion b)
{
return !(a < b);
}
/// <summary>
/// Determines whether the first specified SemanticVersion is less than the second specified SemanticVersion.
/// </summary>
/// <param name="a">The first semantic version to compare, or null.</param>
/// <param name="b">The second semantic version to compare, or null.</param>
/// <returns>
/// True if the value of a is less than b; otherwise false.
/// </returns>
public static bool operator <(SemanticVersion a, SemanticVersion b)
{
return b > a;
}
/// <summary>
/// Determines whether the first specified SemanticVersion is less than or equal to the second specified SemanticVersion.
/// </summary>
/// <param name="a">The first semantic version to compare, or null.</param>
/// <param name="b">The second semantic version to compare, or null.</param>
/// <returns>
/// True if the value of a is less than or equal to b; otherwise false.
/// </returns>
public static bool operator <=(SemanticVersion a, SemanticVersion b)
{
return !(b < a);
}
// private methods
private ServerVersion AsServerVersion()
{
return new ServerVersion(_major, _minor, _patch, _preRelease);
}
private bool IsInternalServerBuild()
{
if (_preRelease != null)
{
var internalBuildPattern = @"^(.+-)?\d+-g[0-9a-fA-F]{4,40}$";
return Regex.IsMatch(_preRelease, internalBuildPattern);
}
return false;
}
}
}