1 files changed, 141 insertions, 0 deletions
diff --git a/src/SMAPI/Framework/ModData/ModDataRecord.cs b/src/SMAPI/Framework/ModData/ModDataRecord.cs
new file mode 100644
index 00000000..79a954f7
--- /dev/null
+++ b/src/SMAPI/Framework/ModData/ModDataRecord.cs
@@ -0,0 +1,141 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace StardewModdingAPI.Framework.ModData
+{
+    /// <summary>Raw mod metadata from SMAPI's internal mod list.</summary>
+    internal class ModDataRecord
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>This field stores properties that aren't mapped to another field before they're parsed into <see cref="Fields"/>.</summary>
+        [JsonExtensionData]
+        private IDictionary<string, JToken> ExtensionData;
+
+
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The mod's current unique ID.</summary>
+        public string ID { get; set; }
+
+        /// <summary>The former mod IDs (if any).</summary>
+        /// <remarks>
+        /// This uses a custom format which uniquely identifies a mod across multiple versions and
+        /// supports matching other fields if no ID was specified. This doesn't include the latest
+        /// ID, if any. Format rules:
+        ///   1. If the mod's ID changed over time, multiple variants can be separated by the
+        ///      <c>|</c> character.
+        ///   2. Each variant can take one of two forms:
+        ///      - A simple string matching the mod's UniqueID value.
+        ///      - A JSON structure containing any of four manifest fields (ID, Name, Author, and
+        ///        EntryDll) to match.
+        /// </remarks>
+        public string FormerIDs { get; set; }
+
+        /// <summary>Maps local versions to a semantic version for update checks.</summary>
+        public IDictionary<string, string> MapLocalVersions { get; set; } = new Dictionary<string, string>();
+
+        /// <summary>Maps remote versions to a semantic version for update checks.</summary>
+        public IDictionary<string, string> MapRemoteVersions { get; set; } = new Dictionary<string, string>();
+
+        /// <summary>The versioned field data.</summary>
+        /// <remarks>
+        /// This maps field names to values. This should be accessed via <see cref="GetFields"/>.
+        /// Format notes:
+        ///   - Each key consists of a field name prefixed with any combination of version range
+        ///     and <c>Default</c>, separated by pipes (whitespace trimmed). For example, <c>Name</c>
+        ///     will always override the name, <c>Default | Name</c> will only override a blank
+        ///     name, and <c>~1.1 | Default | Name</c> will override blank names up to version 1.1.
+        ///   - The version format is <c>min~max</c> (where either side can be blank for unbounded), or
+        ///     a single version number.
+        ///   - The field name itself corresponds to a <see cref="ModDataFieldKey"/> value.
+        /// </remarks>
+        public IDictionary<string, string> Fields { get; set; } = new Dictionary<string, string>();
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Get a parsed representation of the <see cref="Fields"/>.</summary>
+        public IEnumerable<ModDataField> GetFields()
+        {
+            foreach (KeyValuePair<string, string> pair in this.Fields)
+            {
+                // init fields
+                string packedKey = pair.Key;
+                string value = pair.Value;
+                bool isDefault = false;
+                ISemanticVersion lowerVersion = null;
+                ISemanticVersion upperVersion = null;
+
+                // parse
+                string[] parts = packedKey.Split('|').Select(p => p.Trim()).ToArray();
+                ModDataFieldKey fieldKey = (ModDataFieldKey)Enum.Parse(typeof(ModDataFieldKey), parts.Last(), ignoreCase: true);
+                foreach (string part in parts.Take(parts.Length - 1))
+                {
+                    // 'default'
+                    if (part.Equals("Default", StringComparison.InvariantCultureIgnoreCase))
+                    {
+                        isDefault = true;
+                        continue;
+                    }
+
+                    // version range
+                    if (part.Contains("~"))
+                    {
+                        string[] versionParts = part.Split(new[] { '~' }, 2);
+                        lowerVersion = versionParts[0] != "" ? new SemanticVersion(versionParts[0]) : null;
+                        upperVersion = versionParts[1] != "" ? new SemanticVersion(versionParts[1]) : null;
+                        continue;
+                    }
+
+                    // single version
+                    lowerVersion = new SemanticVersion(part);
+                    upperVersion = new SemanticVersion(part);
+                }
+
+                yield return new ModDataField(fieldKey, value, isDefault, lowerVersion, upperVersion);
+            }
+        }
+
+        /// <summary>Get a semantic local version for update checks.</summary>
+        /// <param name="version">The remote version to normalise.</param>
+        public string GetLocalVersionForUpdateChecks(string version)
+        {
+            return this.MapLocalVersions != null && this.MapLocalVersions.TryGetValue(version, out string newVersion)
+                ? newVersion
+                : version;
+        }
+
+        /// <summary>Get a semantic remote version for update checks.</summary>
+        /// <param name="version">The remote version to normalise.</param>
+        public string GetRemoteVersionForUpdateChecks(string version)
+        {
+            return this.MapRemoteVersions != null && this.MapRemoteVersions.TryGetValue(version, out string newVersion)
+                ? newVersion
+                : version;
+        }
+
+
+        /*********
+        ** Private methods
+        *********/
+        /// <summary>The method invoked after JSON deserialisation.</summary>
+        /// <param name="context">The deserialisation context.</param>
+        [OnDeserialized]
+        private void OnDeserialized(StreamingContext context)
+        {
+            if (this.ExtensionData != null)
+            {
+                this.Fields = this.ExtensionData.ToDictionary(p => p.Key, p => p.Value.ToString());
+                this.ExtensionData = null;
+            }
+        }
+    }
+}