NuGetGallery/tests/CatalogTests/SemanticVersionExtensions.cs

using NuGet;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CatalogTests
{
    static class SemanticVersionExtensions
    {
        public static string Normalize(string version)
        {
            SemanticVersion parsed;
            if (!SemanticVersion.TryParse(version, out parsed))
            {
                return version;
            }
            return parsed.ToNormalizedString();
        }


        public static string ToNormalizedString(this SemanticVersion self)
        {
            // SemanticVersion normalizes the missing components to 0.
            return String.Format(CultureInfo.InvariantCulture,
                "{0}.{1}.{2}{3}{4}",
                self.Version.Major,
                self.Version.Minor,
                self.Version.Build,
                self.Version.Revision > 0 ? ("." + self.Version.Revision.ToString(CultureInfo.InvariantCulture)) : String.Empty,
                !String.IsNullOrEmpty(self.SpecialVersion) ? ("-" + self.SpecialVersion) : String.Empty);


        }


        public static string ToNormalizedStringSafe(this SemanticVersion self)
        {
            return self != null ? self.ToNormalizedString() : String.Empty;
        }
    }
}