using System; using System.Collections.Generic; using System.Linq; using System.Linq.Expressions; using System.Reflection; using System.Text; namespace Cinemachine.Utility { /// An ad-hoc collection of helpers for reflection, used by Cinemachine /// or its editor tools in various places [DocumentationSorting(0, DocumentationSortingAttribute.Level.Undoc)] public static class ReflectionHelpers { /// Copy the fields from one object to another /// The source object to copy from /// The destination object to copy to /// The mask to filter the attributes. /// Only those fields that get caught in the filter will be copied public static void CopyFields( Object src, Object dst, BindingFlags bindingAttr = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance) { if (src != null && dst != null) { Type type = src.GetType(); FieldInfo[] fields = type.GetFields(bindingAttr); for (int i = 0; i < fields.Length; ++i) if (!fields[i].IsStatic) fields[i].SetValue(dst, fields[i].GetValue(src)); } } #if UNITY_EDITOR /// Search the assembly for all types that match a predicate /// The assembly to search /// The type to look for /// A list of types found in the assembly that inherit from the predicate public static IEnumerable GetTypesInAssembly( Assembly assembly, Predicate predicate) { if (assembly == null) return null; Type[] types = new Type[0]; try { types = assembly.GetTypes(); } catch (Exception) { // Can't load the types in this assembly } types = (from t in types where t != null && predicate(t) select t).ToArray(); return types; } /// Get a type from a name /// The name of the type to search for /// The type matching the name, or null if not found public static Type GetTypeInAllLoadedAssemblies(string typeName) { foreach (Type type in GetTypesInAllLoadedAssemblies(t => t.Name == typeName)) return type; return null; } /// Search all assemblies for all types that match a predicate /// The type to look for /// A list of types found in the assembly that inherit from the predicate public static IEnumerable GetTypesInAllLoadedAssemblies(Predicate predicate) { Assembly[] assemblies = System.AppDomain.CurrentDomain.GetAssemblies(); List foundTypes = new List(100); foreach (Assembly assembly in assemblies) { foreach (Type foundType in GetTypesInAssembly(assembly, predicate)) foundTypes.Add(foundType); } return foundTypes; } /// call GetTypesInAssembly() for all assemblies that match a predicate /// Which assemblies to search /// What type to look for public static IEnumerable GetTypesInLoadedAssemblies( Predicate assemblyPredicate, Predicate predicate) { Assembly[] assemblies = System.AppDomain.CurrentDomain.GetAssemblies(); assemblies = assemblies.Where((Assembly assembly) => { return assemblyPredicate(assembly); }).OrderBy((Assembly ass) => { return ass.FullName; }).ToArray(); List foundTypes = new List(100); foreach (Assembly assembly in assemblies) { foreach (Type foundType in GetTypesInAssembly(assembly, predicate)) foundTypes.Add(foundType); } return foundTypes; } public static bool TypeIsDefined(string fullname) { return (from assembly in AppDomain.CurrentDomain.GetAssemblies() from type in assembly.GetTypes() where type.FullName == fullname select type).Count() > 0; } #endif /// Cheater extension to access internal field of an object /// The type of the field /// The object to access /// The string name of the field to access /// The value of the field in the objects public static T AccessInternalField(this Type type, object obj, string memberName) { if (string.IsNullOrEmpty(memberName) || (type == null)) return default(T); BindingFlags bindingFlags = BindingFlags.NonPublic; if (obj != null) bindingFlags |= BindingFlags.Instance; else bindingFlags |= BindingFlags.Static; FieldInfo field = type.GetField(memberName, bindingFlags); if ((field != null) && (field.FieldType == typeof(T))) return (T)field.GetValue(obj); else return default(T); } /// Get the object owner of a field. This method processes /// the '.' separator to get from the object that owns the compound field /// to the object that owns the leaf field /// The name of the field, which may contain '.' separators /// the owner of the compound field public static object GetParentObject(string path, object obj) { var fields = path.Split('.'); if (fields.Length == 1) return obj; var info = obj.GetType().GetField( fields[0], BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance); obj = info.GetValue(obj); return GetParentObject(string.Join(".", fields, 1, fields.Length - 1), obj); } /// Returns a string path from an expression - mostly used to retrieve serialized properties /// without hardcoding the field path. Safer, and allows for proper refactoring. public static string GetFieldPath(Expression> expr) { MemberExpression me; switch (expr.Body.NodeType) { case ExpressionType.MemberAccess: me = expr.Body as MemberExpression; break; default: throw new InvalidOperationException(); } var members = new List(); while (me != null) { members.Add(me.Member.Name); me = me.Expression as MemberExpression; } var sb = new StringBuilder(); for (int i = members.Count - 1; i >= 0; i--) { sb.Append(members[i]); if (i > 0) sb.Append('.'); } return sb.ToString(); } } }