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Diffstat (limited to 'src/StardewModdingAPI/SemanticVersion.cs')
| -rw-r--r-- | src/StardewModdingAPI/SemanticVersion.cs | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/src/StardewModdingAPI/SemanticVersion.cs b/src/StardewModdingAPI/SemanticVersion.cs new file mode 100644 index 00000000..e448eae1 --- /dev/null +++ b/src/StardewModdingAPI/SemanticVersion.cs @@ -0,0 +1,239 @@ +using System; +using System.Text.RegularExpressions; +using Newtonsoft.Json; + +namespace StardewModdingAPI +{ + /// <summary>A semantic version with an optional release tag.</summary> + public class SemanticVersion : ISemanticVersion + { + /********* + ** Properties + *********/ + /// <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> + private 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]+[\-\.]?)+))?$", RegexOptions.CultureInvariant | RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.ExplicitCapture); + + + /********* + ** Accessors + *********/ + /// <summary>The major version incremented for major API changes.</summary> + public int MajorVersion { get; } + + /// <summary>The minor version incremented for backwards-compatible changes.</summary> + public int MinorVersion { get; } + + /// <summary>The patch version for backwards-compatible bug fixes.</summary> + public int PatchVersion { get; } + + /// <summary>An optional build tag.</summary> + public string Build { get; } + + + /********* + ** Public methods + *********/ + /// <summary>Construct an instance.</summary> + /// <param name="majorVersion">The major version incremented for major API changes.</param> + /// <param name="minorVersion">The minor version incremented for backwards-compatible changes.</param> + /// <param name="patchVersion">The patch version for backwards-compatible bug fixes.</param> + /// <param name="build">An optional build tag.</param> + [JsonConstructor] + public SemanticVersion(int majorVersion, int minorVersion, int patchVersion, string build = null) + { + this.MajorVersion = majorVersion; + this.MinorVersion = minorVersion; + this.PatchVersion = patchVersion; + this.Build = this.GetNormalisedTag(build); + } + + /// <summary>Construct an instance.</summary> + /// <param name="version">The semantic version string.</param> + /// <exception cref="ArgumentNullException">The <paramref name="version"/> is null.</exception> + /// <exception cref="FormatException">The <paramref name="version"/> is not a valid semantic version.</exception> + public SemanticVersion(string version) + { + // parse + if (version == null) + throw new ArgumentNullException(nameof(version), "The input version string can't be null."); + var match = SemanticVersion.Regex.Match(version.Trim()); + if (!match.Success) + throw new FormatException($"The input '{version}' isn't a valid semantic version."); + + // initialise + this.MajorVersion = int.Parse(match.Groups["major"].Value); + this.MinorVersion = match.Groups["minor"].Success ? int.Parse(match.Groups["minor"].Value) : 0; + this.PatchVersion = match.Groups["patch"].Success ? int.Parse(match.Groups["patch"].Value) : 0; + this.Build = 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> + /// <remarks>The implementation is defined by Semantic Version 2.0 (http://semver.org/).</remarks> + public int CompareTo(ISemanticVersion other) + { + if (other == null) + throw new ArgumentNullException(nameof(other)); + + const int same = 0; + const int curNewer = 1; + const int curOlder = -1; + + // compare stable versions + if (this.MajorVersion != other.MajorVersion) + return this.MajorVersion.CompareTo(other.MajorVersion); + if (this.MinorVersion != other.MinorVersion) + return this.MinorVersion.CompareTo(other.MinorVersion); + if (this.PatchVersion != other.PatchVersion) + return this.PatchVersion.CompareTo(other.PatchVersion); + if (this.Build == other.Build) + return same; + + // stable supercedes pre-release + bool curIsStable = string.IsNullOrWhiteSpace(this.Build); + bool otherIsStable = string.IsNullOrWhiteSpace(other.Build); + if (curIsStable) + return curNewer; + if (otherIsStable) + return curOlder; + + // compare two pre-release tag values + string[] curParts = this.Build.Split('.', '-'); + string[] otherParts = other.Build.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(), other.ToString(), StringComparison.InvariantCultureIgnoreCase); + } + + /// <summary>Get whether this version is older than the specified version.</summary> + /// <param name="other">The version to compare with this instance.</param> + public bool IsOlderThan(ISemanticVersion other) + { + return this.CompareTo(other) < 0; + } + + /// <summary>Get whether this version is older than the specified version.</summary> + /// <param name="other">The version to compare with this instance.</param> + /// <exception cref="FormatException">The specified version is not a valid semantic version.</exception> + public bool IsOlderThan(string other) + { + return this.IsOlderThan(new SemanticVersion(other)); + } + + /// <summary>Get whether this version is newer than the specified version.</summary> + /// <param name="other">The version to compare with this instance.</param> + public bool IsNewerThan(ISemanticVersion other) + { + return this.CompareTo(other) > 0; + } + + /// <summary>Get whether this version is newer than the specified version.</summary> + /// <param name="other">The version to compare with this instance.</param> + /// <exception cref="FormatException">The specified version is not a valid semantic version.</exception> + public bool IsNewerThan(string other) + { + return this.IsNewerThan(new SemanticVersion(other)); + } + + /// <summary>Get whether this version is between two specified versions (inclusively).</summary> + /// <param name="min">The minimum version.</param> + /// <param name="max">The maximum version.</param> + public bool IsBetween(ISemanticVersion min, ISemanticVersion max) + { + return this.CompareTo(min) >= 0 && this.CompareTo(max) <= 0; + } + + /// <summary>Get whether this version is between two specified versions (inclusively).</summary> + /// <param name="min">The minimum version.</param> + /// <param name="max">The maximum version.</param> + /// <exception cref="FormatException">One of the specified versions is not a valid semantic version.</exception> + public bool IsBetween(string min, string max) + { + return this.IsBetween(new SemanticVersion(min), new SemanticVersion(max)); + } + +#if !SMAPI_1_x + /// <summary>Indicates whether the current object is equal to another object of the same type.</summary> + /// <returns>true if the current object is equal to the <paramref name="other" /> parameter; otherwise, false.</returns> + /// <param name="other">An object to compare with this object.</param> + public bool Equals(ISemanticVersion other) + { + return other != null && this.CompareTo(other) == 0; + } +#endif + + /// <summary>Get a string representation of the version.</summary> + public override string ToString() + { + // version + string result = this.PatchVersion != 0 + ? $"{this.MajorVersion}.{this.MinorVersion}.{this.PatchVersion}" + : $"{this.MajorVersion}.{this.MinorVersion}"; + + // tag + string tag = this.Build; + 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 ISemanticVersion parsed) + { + try + { + parsed = new SemanticVersion(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(); + if (string.IsNullOrWhiteSpace(tag) || tag == "0") // '0' from incorrect examples in old SMAPI documentation + return null; + return tag; + } + } +} |