From 51f5be1e740f8897339afbbd5916fd627c081db0 Mon Sep 17 00:00:00 2001 From: Jesse Plamondon-Willard Date: Sun, 8 Oct 2017 00:09:16 -0400 Subject: move semver implementation into shared project for reuse --- src/SMAPI.Common/SemanticVersionImpl.cs | 192 ++++++++++++++++++++++++++++++++ 1 file changed, 192 insertions(+) create mode 100644 src/SMAPI.Common/SemanticVersionImpl.cs (limited to 'src/SMAPI.Common/SemanticVersionImpl.cs') diff --git a/src/SMAPI.Common/SemanticVersionImpl.cs b/src/SMAPI.Common/SemanticVersionImpl.cs new file mode 100644 index 00000000..c257aaaf --- /dev/null +++ b/src/SMAPI.Common/SemanticVersionImpl.cs @@ -0,0 +1,192 @@ +using System; +using System.Text.RegularExpressions; +using Newtonsoft.Json; + +namespace StardewModdingAPI.Common +{ + /// A low-level implementation of a semantic version with an optional release tag. + /// The implementation is defined by Semantic Version 2.0 (http://semver.org/). + internal class SemanticVersionImpl + { + /********* + ** 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]+[\-\.]?)+))?$", RegexOptions.CultureInvariant | RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.ExplicitCapture); + + + /********* + ** Accessors + *********/ + /// The major version incremented for major API changes. + public int Major { get; } + + /// The minor version incremented for backwards-compatible changes. + public int Minor { get; } + + /// The patch version for backwards-compatible bug fixes. + public int Patch { get; } + + /// An optional prerelease tag. + public string Tag { get; } + + + /********* + ** Public methods + *********/ + /// Construct an instance. + /// The major version incremented for major API changes. + /// The minor version incremented for backwards-compatible changes. + /// The patch version for backwards-compatible bug fixes. + /// An optional prerelease tag. + [JsonConstructor] + public SemanticVersionImpl(int major, int minor, int patch, string tag = null) + { + this.Major = major; + this.Minor = minor; + this.Patch = patch; + this.Tag = this.GetNormalisedTag(tag); + } + + /// Construct an instance. + /// The semantic version string. + /// The is null. + /// The is not a valid semantic version. + public SemanticVersionImpl(string version) + { + // parse + if (version == null) + throw new ArgumentNullException(nameof(version), "The input version string can't be null."); + var match = SemanticVersionImpl.Regex.Match(version.Trim()); + if (!match.Success) + throw new FormatException($"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; + } + + /// 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. + public int CompareTo(SemanticVersionImpl other) + { + if (other == null) + throw new ArgumentNullException(nameof(other)); + return this.CompareTo(other.Major, other.Minor, other.Patch, other.Tag); + } + + + /// Get an integer indicating whether this version precedes (less than 0), supercedes (more than 0), or is equivalent to (0) the specified version. + /// The major version to compare with this instance. + /// The minor version to compare with this instance. + /// The patch version to compare with this instance. + /// The prerelease tag to compare with this instance. + 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); + } + + /// Get a string representation of the version. + 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; + } + + /// 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 SemanticVersionImpl parsed) + { + try + { + parsed = new SemanticVersionImpl(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