From 929dccb75a1405737975d76648e015a3e7c00177 Mon Sep 17 00:00:00 2001 From: Jesse Plamondon-Willard Date: Sat, 7 Oct 2017 23:07:10 -0400 Subject: reorganise repo structure --- src/SMAPI/SemanticVersion.cs | 237 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 237 insertions(+) create mode 100644 src/SMAPI/SemanticVersion.cs (limited to 'src/SMAPI/SemanticVersion.cs') diff --git a/src/SMAPI/SemanticVersion.cs b/src/SMAPI/SemanticVersion.cs new file mode 100644 index 00000000..1b99dae6 --- /dev/null +++ b/src/SMAPI/SemanticVersion.cs @@ -0,0 +1,237 @@ +using System; +using System.Text.RegularExpressions; +using Newtonsoft.Json; + +namespace StardewModdingAPI +{ + /// A semantic version with an optional release tag. + public class SemanticVersion : ISemanticVersion + { + /********* + ** Properties + *********/ + /// A regular expression matching a semantic version string. + /// + /// This pattern is derived from the BNF documentation in the semver repo, + /// 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. + /// + private static readonly Regex Regex = new Regex(@"^(?>(?0|[1-9]\d*))\.(?>(?0|[1-9]\d*))(?>(?:\.(?0|[1-9]\d*))?)(?:-(?(?>[a-z0-9]+[\-\.]?)+))?$", RegexOptions.CultureInvariant | RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.ExplicitCapture); + + + /********* + ** Accessors + *********/ + /// The major version incremented for major API changes. + public int MajorVersion { get; } + + /// The minor version incremented for backwards-compatible changes. + public int MinorVersion { get; } + + /// The patch version for backwards-compatible bug fixes. + public int PatchVersion { get; } + + /// An optional build tag. + public string Build { get; } + + + /********* + ** Public methods + *********/ + /// Construct an instance. + /// The major version incremented for major API changes. + /// The minor version incremented for backwards-compatible changes. + /// The patch version for backwards-compatible bug fixes. + /// An optional build tag. + [JsonConstructor] + public SemanticVersion(int majorVersion, int minorVersion, int patchVersion, string build = null) + { + this.MajorVersion = majorVersion; + this.MinorVersion = minorVersion; + this.PatchVersion = patchVersion; + this.Build = this.GetNormalisedTag(build); + } + + /// Construct an instance. + /// The semantic version string. + /// The is null. + /// The is not a valid semantic version. + public SemanticVersion(string version) + { + // parse + if (version == null) + throw new ArgumentNullException(nameof(version), "The input version string can't be null."); + var match = SemanticVersion.Regex.Match(version.Trim()); + if (!match.Success) + throw new FormatException($"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; + } + + /// Get an integer indicating whether this version precedes (less than 0), supercedes (more than 0), or is equivalent to (0) the specified version. + /// The version to compare with this instance. + /// The value is null. + /// The implementation is defined by Semantic Version 2.0 (http://semver.org/). + 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); + } + + /// Get whether this version is older than the specified version. + /// The version to compare with this instance. + public bool IsOlderThan(ISemanticVersion other) + { + return this.CompareTo(other) < 0; + } + + /// Get whether this version is older than the specified version. + /// The version to compare with this instance. + /// The specified version is not a valid semantic version. + public bool IsOlderThan(string other) + { + return this.IsOlderThan(new SemanticVersion(other)); + } + + /// Get whether this version is newer than the specified version. + /// The version to compare with this instance. + public bool IsNewerThan(ISemanticVersion other) + { + return this.CompareTo(other) > 0; + } + + /// Get whether this version is newer than the specified version. + /// The version to compare with this instance. + /// The specified version is not a valid semantic version. + public bool IsNewerThan(string other) + { + return this.IsNewerThan(new SemanticVersion(other)); + } + + /// Get whether this version is between two specified versions (inclusively). + /// The minimum version. + /// The maximum version. + public bool IsBetween(ISemanticVersion min, ISemanticVersion max) + { + return this.CompareTo(min) >= 0 && this.CompareTo(max) <= 0; + } + + /// Get whether this version is between two specified versions (inclusively). + /// The minimum version. + /// The maximum version. + /// One of the specified versions is not a valid semantic version. + public bool IsBetween(string min, string max) + { + return this.IsBetween(new SemanticVersion(min), new SemanticVersion(max)); + } + + /// Indicates whether the current object is equal to another object of the same type. + /// true if the current object is equal to the parameter; otherwise, false. + /// An object to compare with this object. + public bool Equals(ISemanticVersion other) + { + return other != null && this.CompareTo(other) == 0; + } + + /// Get a string representation of the version. + 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; + } + + /// Parse a version string without throwing an exception if it fails. + /// The version string. + /// The parsed representation. + /// Returns whether parsing the version succeeded. + internal static bool TryParse(string version, out ISemanticVersion parsed) + { + try + { + parsed = new SemanticVersion(version); + return true; + } + catch + { + parsed = null; + return false; + } + } + + + /********* + ** Private methods + *********/ + /// Get a normalised build tag. + /// The tag to normalise. + 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; + } + } +} -- cgit