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224 lines
9.4 KiB
224 lines
9.4 KiB
using System;
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using System.Collections.Generic;
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using System.Text;
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#if NET3
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using Net3_Proxy;
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#endif
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namespace IPA.Loader.Features
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{
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/// <summary>
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/// The root interface for a mod Feature.
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/// </summary>
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/// <remarks>
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/// Avoid storing any data in any subclasses. If you do, it may result in a failure to load the feature.
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/// </remarks>
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public abstract class Feature
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{
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/// <summary>
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/// Initializes the feature with the parameters provided in the definition.
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///
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/// Note: When no parenthesis are provided, <paramref name="parameters"/> is an empty array.
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/// </summary>
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/// <remarks>
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/// This gets called BEFORE *your* `Init` method.
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///
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/// Returning <see langword="false" /> does *not* prevent the plugin from being loaded. It simply prevents the feature from being used.
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/// </remarks>
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/// <param name="meta">the metadata of the plugin that is being prepared</param>
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/// <param name="parameters">the parameters passed to the feature definition, or null</param>
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/// <returns><see langword="true"/> if the feature is valid for the plugin, <see langword="false"/> otherwise</returns>
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public abstract bool Initialize(PluginMetadata meta, string[] parameters);
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/// <summary>
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/// Evaluates the Feature for use in conditional meta-Features. This should be re-calculated on every call, unless it can be proven to not change.
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///
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/// This will be called on every feature that returns <see langword="true" /> from <see cref="Initialize"/>
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/// </summary>
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/// <returns>the truthiness of the Feature.</returns>
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public virtual bool Evaluate() => true;
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/// <summary>
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/// The message to be logged when the feature is not valid for a plugin.
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/// This should also be set whenever either <see cref="BeforeLoad"/> or <see cref="BeforeInit"/> returns false.
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/// </summary>
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/// <value>the message to show when the feature is marked invalid</value>
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public virtual string InvalidMessage { get; protected set; }
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/// <summary>
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/// Called before a plugin is loaded. This should never throw an exception. An exception will abort the loading of the plugin with an error.
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/// </summary>
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/// <remarks>
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/// The assembly will still be loaded, but the plugin will not be constructed if this returns <see langword="false" />.
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/// Any features it defines, for example, will still be loaded.
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/// </remarks>
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/// <param name="plugin">the plugin about to be loaded</param>
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/// <returns>whether or not the plugin should be loaded</returns>
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public virtual bool BeforeLoad(PluginMetadata plugin) => true;
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/// <summary>
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/// Called before a plugin's `Init` method is called. This will not be called if there is no `Init` method. This should never throw an exception. An exception will abort the loading of the plugin with an error.
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/// </summary>
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/// <param name="plugin">the plugin to be initialized</param>
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/// <returns>whether or not to call the Init method</returns>
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public virtual bool BeforeInit(PluginMetadata plugin) => true;
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/// <summary>
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/// Called after a plugin has been fully initialized, whether or not there is an `Init` method. This should never throw an exception.
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/// </summary>
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/// <param name="plugin">the plugin that was just initialized</param>
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/// <param name="pluginInstance">the instance of the plugin being initialized</param>
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public virtual void AfterInit(PluginMetadata plugin, object pluginInstance) => AfterInit(plugin);
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/// <summary>
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/// Called after a plugin has been fully initialized, whether or not there is an `Init` method. This should never throw an exception.
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/// </summary>
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/// <param name="plugin">the plugin that was just initialized</param>
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public virtual void AfterInit(PluginMetadata plugin) { }
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/// <summary>
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/// Ensures a plugin's assembly is loaded. Do not use unless you need to.
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/// </summary>
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/// <param name="plugin">the plugin to ensure is loaded.</param>
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protected void RequireLoaded(PluginMetadata plugin) => PluginLoader.Load(plugin);
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/// <summary>
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/// Defines whether or not this feature will be accessible from the plugin metadata once loaded.
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/// </summary>
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/// <value><see langword="true"/> if this <see cref="Feature"/> will be stored on the plugin metadata, <see langword="false"/> otherwise</value>
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protected internal virtual bool StoreOnPlugin => true;
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static Feature()
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{
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Reset();
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}
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internal static void Reset()
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{
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featureTypes = new Dictionary<string, Type>
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{
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{ "define-feature", typeof(DefineFeature) }
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};
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}
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private static Dictionary<string, Type> featureTypes;
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internal static bool HasFeature(string name) => featureTypes.ContainsKey(name);
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internal static bool RegisterFeature(string name, Type type)
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{
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if (!typeof(Feature).IsAssignableFrom(type))
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throw new ArgumentException($"Feature type not subclass of {nameof(Feature)}", nameof(type));
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if (featureTypes.ContainsKey(name)) return false;
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featureTypes.Add(name, type);
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return true;
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}
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internal struct FeatureParse
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{
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public readonly string Name;
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public readonly string[] Parameters;
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public FeatureParse(string name, string[] parameters)
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{
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Name = name;
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Parameters = parameters;
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}
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}
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// returns false with both outs null for no such feature
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internal static bool TryParseFeature(string featureString, PluginMetadata plugin,
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out Feature feature, out Exception failException, out bool featureValid, out FeatureParse parsed,
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FeatureParse? preParsed = null)
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{
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failException = null;
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feature = null;
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featureValid = false;
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if (preParsed == null)
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{
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var builder = new StringBuilder();
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string name = null;
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var parameters = new List<string>();
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bool escape = false;
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int parens = 0;
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bool removeWhitespace = true;
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foreach (var chr in featureString)
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{
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if (escape)
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{
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builder.Append(chr);
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escape = false;
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}
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else
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{
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switch (chr)
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{
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case '\\':
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escape = true;
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break;
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case '(':
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parens++;
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if (parens != 1) goto default;
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removeWhitespace = true;
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name = builder.ToString();
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builder.Clear();
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break;
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case ')':
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parens--;
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if (parens != 0) goto default;
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goto case ',';
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case ',':
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if (parens > 1) goto default;
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parameters.Add(builder.ToString());
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builder.Clear();
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removeWhitespace = true;
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break;
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default:
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if (removeWhitespace && !char.IsWhiteSpace(chr))
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removeWhitespace = false;
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if (!removeWhitespace)
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builder.Append(chr);
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break;
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}
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}
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}
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if (name == null)
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name = builder.ToString();
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parsed = new FeatureParse(name, parameters.ToArray());
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if (parens != 0)
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{
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failException = new Exception("Malformed feature definition");
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return false;
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}
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}
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else
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parsed = preParsed.Value;
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if (!featureTypes.TryGetValue(parsed.Name, out var featureType))
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return false;
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try
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{
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if (!(Activator.CreateInstance(featureType) is Feature aFeature))
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{
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failException = new InvalidCastException("Feature type not a subtype of Feature");
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return false;
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}
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featureValid = aFeature.Initialize(plugin, parsed.Parameters);
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feature = aFeature;
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return true;
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}
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catch (Exception e)
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{
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failException = e;
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return false;
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}
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}
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}
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}
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