1 files changed, 55 insertions, 0 deletions
diff --git a/src/SMAPI/Framework/Models/ModCompatibility.cs b/src/SMAPI/Framework/Models/ModCompatibility.cs
new file mode 100644
index 00000000..54737e6c
--- /dev/null
+++ b/src/SMAPI/Framework/Models/ModCompatibility.cs
@@ -0,0 +1,55 @@
+using System;
+
+namespace StardewModdingAPI.Framework.Models
+{
+    /// <summary>Specifies the compatibility of a given mod version range.</summary>
+    internal class ModCompatibility
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The lowest version in the range, or <c>null</c> for all past versions.</summary>
+        public ISemanticVersion LowerVersion { get; }
+
+        /// <summary>The highest version in the range, or <c>null</c> for all future versions.</summary>
+        public ISemanticVersion UpperVersion { get; }
+
+        /// <summary>The mod compatibility.</summary>
+        public ModStatus Status { get; }
+
+        /// <summary>The reason phrase to show in log output, or <c>null</c> to use the default value.</summary>
+        /// <example>For example, "this version is incompatible with the latest version of the game".</example>
+        public string ReasonPhrase { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="versionRange">A version range, which consists of two version strings separated by a '~' character. Either side can be left blank for an unbounded range.</param>
+        /// <param name="status">The mod compatibility.</param>
+        /// <param name="reasonPhrase">The reason phrase to show in log output, or <c>null</c> to use the default value.</param>
+        public ModCompatibility(string versionRange, ModStatus status, string reasonPhrase)
+        {
+            // extract version strings
+            string[] versions = versionRange.Split('~');
+            if (versions.Length != 2)
+                throw new FormatException($"Could not parse '{versionRange}' as a version range. It must have two version strings separated by a '~' character (either side can be left blank for an unbounded range).");
+
+            // initialise
+            this.LowerVersion = !string.IsNullOrWhiteSpace(versions[0]) ? new SemanticVersion(versions[0]) : null;
+            this.UpperVersion = !string.IsNullOrWhiteSpace(versions[1]) ? new SemanticVersion(versions[1]) : null;
+            this.Status = status;
+            this.ReasonPhrase = reasonPhrase;
+        }
+
+        /// <summary>Get whether a given version is contained within this compatibility range.</summary>
+        /// <param name="version">The version to check.</param>
+        public bool MatchesVersion(ISemanticVersion version)
+        {
+            return
+                (this.LowerVersion == null || !version.IsOlderThan(this.LowerVersion))
+                && (this.UpperVersion == null || !version.IsNewerThan(this.UpperVersion));
+        }
+    }
+}