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using System;
using System.Text.RegularExpressions;
namespace StardewModdingAPI.Common
{
/// <summary>A low-level implementation of a semantic version with an optional release tag.</summary>
/// <remarks>The implementation is defined by Semantic Version 2.0 (http://semver.org/).</remarks>
internal class SemanticVersionImpl
{
/*********
** Accessors
*********/
/// <summary>The major version incremented for major API changes.</summary>
public int Major { get; }
/// <summary>The minor version incremented for backwards-compatible changes.</summary>
public int Minor { get; }
/// <summary>The patch version for backwards-compatible bug fixes.</summary>
public int Patch { get; }
/// <summary>An optional prerelease tag.</summary>
public string Tag { get; }
/// <summary>A regular expression matching a semantic version string.</summary>
/// <remarks>
/// This pattern is derived from the BNF documentation in the <a href="https://github.com/mojombo/semver">semver repo</a>,
/// with three important deviations intended to support Stardew Valley mod conventions:
/// - allows short-form "x.y" versions;
/// - allows hyphens in prerelease tags as synonyms for dots (like "-unofficial-update.3");
/// - doesn't allow '+build' suffixes.
/// </remarks>
internal static readonly Regex Regex = new Regex(@"^(?>(?<major>0|[1-9]\d*))\.(?>(?<minor>0|[1-9]\d*))(?>(?:\.(?<patch>0|[1-9]\d*))?)(?:-(?<prerelease>(?>[a-z0-9]+[\-\.]?)+))?$", RegexOptions.CultureInvariant | RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.ExplicitCapture);
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="major">The major version incremented for major API changes.</param>
/// <param name="minor">The minor version incremented for backwards-compatible changes.</param>
/// <param name="patch">The patch version for backwards-compatible bug fixes.</param>
/// <param name="tag">An optional prerelease tag.</param>
public SemanticVersionImpl(int major, int minor, int patch, string tag = null)
{
this.Major = major;
this.Minor = minor;
this.Patch = patch;
this.Tag = this.GetNormalisedTag(tag);
}
/// <summary>Construct an instance.</summary>
/// <param name="version">The assembly version.</param>
/// <exception cref="ArgumentNullException">The <paramref name="version"/> is null.</exception>
public SemanticVersionImpl(Version version)
{
if (version == null)
throw new ArgumentNullException(nameof(version), "The input version can't be null.");
this.Major = version.Major;
this.Minor = version.Minor;
this.Patch = version.Build;
}
/// <summary>Construct an instance.</summary>
/// <param name="version">The semantic version string.</param>
/// <exception cref="ArgumentNullException">The <paramref name="version"/> is null.</exception>
/// <exception cref="FormatException">The <paramref name="version"/> is not a valid semantic version.</exception>
public SemanticVersionImpl(string version)
{
// parse
if (version == null)
throw new ArgumentNullException(nameof(version), "The input version string can't be null.");
var match = SemanticVersionImpl.Regex.Match(version.Trim());
if (!match.Success)
throw new FormatException($"The input '{version}' isn't a valid semantic version.");
// initialise
this.Major = int.Parse(match.Groups["major"].Value);
this.Minor = match.Groups["minor"].Success ? int.Parse(match.Groups["minor"].Value) : 0;
this.Patch = match.Groups["patch"].Success ? int.Parse(match.Groups["patch"].Value) : 0;
this.Tag = match.Groups["prerelease"].Success ? this.GetNormalisedTag(match.Groups["prerelease"].Value) : null;
}
/// <summary>Get an integer indicating whether this version precedes (less than 0), supercedes (more than 0), or is equivalent to (0) the specified version.</summary>
/// <param name="other">The version to compare with this instance.</param>
/// <exception cref="ArgumentNullException">The <paramref name="other"/> value is null.</exception>
public int CompareTo(SemanticVersionImpl other)
{
if (other == null)
throw new ArgumentNullException(nameof(other));
return this.CompareTo(other.Major, other.Minor, other.Patch, other.Tag);
}
/// <summary>Get an integer indicating whether this version precedes (less than 0), supercedes (more than 0), or is equivalent to (0) the specified version.</summary>
/// <param name="otherMajor">The major version to compare with this instance.</param>
/// <param name="otherMinor">The minor version to compare with this instance.</param>
/// <param name="otherPatch">The patch version to compare with this instance.</param>
/// <param name="otherTag">The prerelease tag to compare with this instance.</param>
public int CompareTo(int otherMajor, int otherMinor, int otherPatch, string otherTag)
{
const int same = 0;
const int curNewer = 1;
const int curOlder = -1;
// compare stable versions
if (this.Major != otherMajor)
return this.Major.CompareTo(otherMajor);
if (this.Minor != otherMinor)
return this.Minor.CompareTo(otherMinor);
if (this.Patch != otherPatch)
return this.Patch.CompareTo(otherPatch);
if (this.Tag == otherTag)
return same;
// stable supercedes pre-release
bool curIsStable = string.IsNullOrWhiteSpace(this.Tag);
bool otherIsStable = string.IsNullOrWhiteSpace(otherTag);
if (curIsStable)
return curNewer;
if (otherIsStable)
return curOlder;
// compare two pre-release tag values
string[] curParts = this.Tag.Split('.', '-');
string[] otherParts = otherTag.Split('.', '-');
for (int i = 0; i < curParts.Length; i++)
{
// longer prerelease tag supercedes if otherwise equal
if (otherParts.Length <= i)
return curNewer;
// compare if different
if (curParts[i] != otherParts[i])
{
// compare numerically if possible
{
if (int.TryParse(curParts[i], out int curNum) && int.TryParse(otherParts[i], out int otherNum))
return curNum.CompareTo(otherNum);
}
// else compare lexically
return string.Compare(curParts[i], otherParts[i], StringComparison.OrdinalIgnoreCase);
}
}
// fallback (this should never happen)
return string.Compare(this.ToString(), new SemanticVersionImpl(otherMajor, otherMinor, otherPatch, otherTag).ToString(), StringComparison.InvariantCultureIgnoreCase);
}
/// <summary>Get a string representation of the version.</summary>
public override string ToString()
{
// version
string result = this.Patch != 0
? $"{this.Major}.{this.Minor}.{this.Patch}"
: $"{this.Major}.{this.Minor}";
// tag
string tag = this.Tag;
if (tag != null)
result += $"-{tag}";
return result;
}
/// <summary>Parse a version string without throwing an exception if it fails.</summary>
/// <param name="version">The version string.</param>
/// <param name="parsed">The parsed representation.</param>
/// <returns>Returns whether parsing the version succeeded.</returns>
internal static bool TryParse(string version, out SemanticVersionImpl parsed)
{
try
{
parsed = new SemanticVersionImpl(version);
return true;
}
catch
{
parsed = null;
return false;
}
}
/*********
** Private methods
*********/
/// <summary>Get a normalised build tag.</summary>
/// <param name="tag">The tag to normalise.</param>
private string GetNormalisedTag(string tag)
{
tag = tag?.Trim();
return !string.IsNullOrWhiteSpace(tag) ? tag : null;
}
}
}
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