SemVersion.cs

/*
Copyright (c) 2013 Max Hauser 

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

From: https://github.com/maxhauser/semver
*/

using System;
#if !NETSTANDARD
using System.Globalization;
using System.Runtime.Serialization;
using System.Security.Permissions;
#endif
using System.Text.RegularExpressions;

namespace Semver
{
#if NETSTANDARD
    public sealed class SemVersion : IComparable<SemVersion>, IComparable
#else
    [Serializable]
    internal sealed class SemVersion : IComparable<SemVersion>, IComparable, ISerializable
#endif
    {
        static Regex parseEx =
            new Regex(@"^(?<major>\d+)" +
                @"(\.(?<minor>\d+))?" +
                @"(\.(?<patch>\d+))?" +
                @"(\-(?<pre>[0-9A-Za-z\-\.]+))?" +
                @"(\+(?<build>[0-9A-Za-z\-\.]+))?$",
#if NETSTANDARD
                RegexOptions.CultureInvariant | RegexOptions.ExplicitCapture);
#else
                RegexOptions.CultureInvariant | RegexOptions.Compiled | RegexOptions.ExplicitCapture);
#endif

#if !NETSTANDARD
        private SemVersion(SerializationInfo info, StreamingContext context)
        {
            if (info == null) throw new ArgumentNullException("info");
            var semVersion = Parse(info.GetString("SemVersion"));
            Major = semVersion.Major;
            Minor = semVersion.Minor;
            Patch = semVersion.Patch;
            Prerelease = semVersion.Prerelease;
            Build = semVersion.Build;
        }
#endif

        public SemVersion(int major, int minor = 0, int patch = 0, string prerelease = "", string build = "")
        {
            this.Major = major;
            this.Minor = minor;
            this.Patch = patch;

            this.Prerelease = prerelease ?? "";
            this.Build = build ?? "";
        }

        public SemVersion(Version version)
        {
            if (version == null)
                throw new ArgumentNullException("version");

            this.Major = version.Major;
            this.Minor = version.Minor;

            if (version.Revision >= 0)
            {
                this.Patch = version.Revision;
            }

            this.Prerelease = String.Empty;

            if (version.Build > 0)
            {
                this.Build = version.Build.ToString();
            }
            else
            {
                this.Build = String.Empty;
            }
        }

        public static SemVersion Parse(string version, bool strict = false)
        {
            var match = parseEx.Match(version);
            if (!match.Success)
            {
                return new SemVersion(0);
            }

#if NETSTANDARD
            var major = int.Parse(match.Groups["major"].Value);
#else
            var major = int.Parse(match.Groups["major"].Value, CultureInfo.InvariantCulture);
#endif

            var minorMatch = match.Groups["minor"];
            int minor = 0;
            if (minorMatch.Success) 
            {
#if NETSTANDARD
                minor = int.Parse(minorMatch.Value);
#else
                minor = int.Parse(minorMatch.Value, CultureInfo.InvariantCulture);
#endif
            }
            else if (strict)
            {
                throw new InvalidOperationException("Invalid version (no minor version given in strict mode)");
            }

            var patchMatch = match.Groups["patch"];
            int patch = 0;
            if (patchMatch.Success)
            {
#if NETSTANDARD
                patch = int.Parse(patchMatch.Value);
#else
                patch = int.Parse(patchMatch.Value, CultureInfo.InvariantCulture);
#endif
            }
            else if (strict) 
            {
                throw new InvalidOperationException("Invalid version (no patch version given in strict mode)");
            }

            var prerelease = match.Groups["pre"].Value;
            var build = match.Groups["build"].Value;

            return new SemVersion(major, minor, patch, prerelease, build);
        }

        public static bool TryParse(string version, out SemVersion semver, bool strict = false)
        {
            try
            {
                semver = Parse(version, strict);
                return true;
            }
            catch (Exception)
            {
                semver = null;
                return false;
            }
        }

        public static bool Equals(SemVersion versionA, SemVersion versionB)
        {
            if (ReferenceEquals(versionA, null))
                return ReferenceEquals(versionB, null);
            return versionA.Equals(versionB);
        }

        public static int Compare(SemVersion versionA, SemVersion versionB)
        {
            if (ReferenceEquals(versionA, null))
                return ReferenceEquals(versionB, null) ? 0 : -1;
            return versionA.CompareTo(versionB);
        }

        public SemVersion Change(int? major = null, int? minor = null, int? patch = null,
            string prerelease = null, string build = null)
        {
            return new SemVersion(
                major ?? this.Major,
                minor ?? this.Minor,
                patch ?? this.Patch,
                prerelease ?? this.Prerelease,
                build ?? this.Build);
        }

        public int Major { get; private set; }

        public int Minor { get; private set; }

        public int Patch { get; private set; }

        public string Prerelease { get; private set; }

        public string Build { get; private set; }

        public override string ToString()
        {
            var version = "" + Major + "." + Minor + "." + Patch;
            if (!String.IsNullOrEmpty(Prerelease))
                version += "-" + Prerelease;
            if (!String.IsNullOrEmpty(Build))
                version += "+" + Build;
            return version;
        }

        public int CompareTo(object obj)
        {
            return CompareTo((SemVersion)obj);
        }

        public int CompareTo(SemVersion other)
        {
            if (ReferenceEquals(other, null))
                return 1;

            var r = this.CompareByPrecedence(other);
            if (r != 0)
                return r;

            r = CompareComponent(this.Build, other.Build);
            return r;
        }

        public bool PrecedenceMatches(SemVersion other)
        {
            return CompareByPrecedence(other) == 0;
        }

        public int CompareByPrecedence(SemVersion other)
        {
            if (ReferenceEquals(other, null))
                return 1;

            var r = this.Major.CompareTo(other.Major);
            if (r != 0) return r;

            r = this.Minor.CompareTo(other.Minor);
            if (r != 0) return r;

            r = this.Patch.CompareTo(other.Patch);
            if (r != 0) return r;

            r = CompareComponent(this.Prerelease, other.Prerelease, true);
            return r;
        }

        static int CompareComponent(string a, string b, bool lower = false)
        {
            var aEmpty = String.IsNullOrEmpty(a);
            var bEmpty = String.IsNullOrEmpty(b);
            if (aEmpty && bEmpty)
                return 0;

            if (aEmpty)
                return lower ? 1 : -1;
            if (bEmpty)
                return lower ? -1 : 1;

            var aComps = a.Split('.');
            var bComps = b.Split('.');

            var minLen = Math.Min(aComps.Length, bComps.Length);
            for (int i = 0; i < minLen; i++)
            {
                var ac = aComps[i];
                var bc = bComps[i];
                int anum, bnum;
                var isanum = Int32.TryParse(ac, out anum);
                var isbnum = Int32.TryParse(bc, out bnum);
                int r;
                if (isanum && isbnum)
                {
                    r = anum.CompareTo(bnum);
                    if (r != 0) return anum.CompareTo(bnum);
                }
                else
                {
                    if (isanum)
                        return -1;
                    if (isbnum)
                        return 1;
                    r = String.CompareOrdinal(ac, bc);
                    if (r != 0)
                        return r;
                }
            }

            return aComps.Length.CompareTo(bComps.Length);
        }

        public override bool Equals(object obj)
        {
            if (ReferenceEquals(obj, null))
                return false;

            if (ReferenceEquals(this, obj))
                return true;

            var other = (SemVersion)obj;

            return this.Major == other.Major &&
                this.Minor == other.Minor &&
                this.Patch == other.Patch &&
                string.Equals(this.Prerelease, other.Prerelease, StringComparison.Ordinal) &&
                string.Equals(this.Build, other.Build, StringComparison.Ordinal);
        }

        public override int GetHashCode()
        {
            unchecked
            {
                int result = this.Major.GetHashCode();
                result = result * 31 + this.Minor.GetHashCode();
                result = result * 31 + this.Patch.GetHashCode();
                result = result * 31 + this.Prerelease.GetHashCode();
                result = result * 31 + this.Build.GetHashCode();
                return result;
            }
        }

#if !NETSTANDARD
        [SecurityPermission(SecurityAction.Demand, SerializationFormatter = true)]
        public void GetObjectData(SerializationInfo info, StreamingContext context)
        {
            if (info == null) throw new ArgumentNullException("info");
            info.AddValue("SemVersion", ToString());
        }
#endif

        public static implicit operator SemVersion(string version)
        {
            return SemVersion.Parse(version);
        }

        public static bool operator ==(SemVersion left, SemVersion right)
        {
            return SemVersion.Equals(left, right);
        }

        public static bool operator !=(SemVersion left, SemVersion right)
        {
            return !SemVersion.Equals(left, right);
        }

        public static bool operator >(SemVersion left, SemVersion right)
        {
            return SemVersion.Compare(left, right) > 0;
        }

        public static bool operator >=(SemVersion left, SemVersion right)
        {
            return left == right || left > right;
        }

        public static bool operator <(SemVersion left, SemVersion right)
        {
            return SemVersion.Compare(left, right) < 0;
        }

        public static bool operator <=(SemVersion left, SemVersion right)
        {
            return left == right || left < right;
        }
    }
}