//******************************************************************************************************//  ValueExpressionParser.cs - Gbtc////  Copyright © 2017, Grid Protection Alliance.  All Rights Reserved.////  Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See//  the NOTICE file distributed with this work for additional information regarding copyright ownership.//  The GPA licenses this file to you under the MIT License (MIT), the "License"; you may not use this//  file except in compliance with the License. You may obtain a copy of the License at:////      http://opensource.org/licenses/MIT////  Unless agreed to in writing, the subject software distributed under the License is distributed on an//  "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the//  License for the specific language governing permissions and limitations.////  Code Modification History://  ----------------------------------------------------------------------------------------------------//  04/09/2017 - J. Ritchie Carroll//       Generated original version of source code.////****************************************************************************************************** using System;using System.Collections.Generic;using System.ComponentModel;using System.Diagnostics.CodeAnalysis;using System.Linq;using System.Linq.Expressions;using System.Reflection;using System.Text.RegularExpressions;using ExpressionEvaluator;using GSF.Collections;using GSF.Identity;using GSF.Reflection; // ReSharper disable UnusedMember.Local// ReSharper disable StaticMemberInGenericType// ReSharper disable PossibleNullReferenceExceptionnamespace GSF.ComponentModel{    /// <summary>    /// Represents a parser for <see cref="IValueExpressionAttribute"/> instances.    /// </summary>    public class ValueExpressionParser : ValueExpressionParser<object>    {        #region [ Constructors ]         /// <summary>        /// Creates a new <see cref="ValueExpressionParser"/>.        /// </summary>        /// <param name="expression">C# expression to be parsed.</param>        public ValueExpressionParser(string expression) : base(expression)        {        }         /// <summary>        /// Creates a new <see cref="ValueExpressionParser"/> from the specified        /// <paramref name="valueExpressionAttribute"/> and <paramref name="property"/>        /// parameters deriving the base expression value from        /// <see cref="IValueExpressionAttribute.GetPropertyUpdateValue"/>.        /// </summary>        /// <param name="valueExpressionAttribute">Source <see cref="IValueExpressionAttribute"/> instance.</param>        /// <param name="property">Source <see cref="PropertyInfo"/> instance.</param>        public ValueExpressionParser(IValueExpressionAttribute valueExpressionAttribute, PropertyInfo property) : base(valueExpressionAttribute, property)        {                    }         #endregion         #region [ Static ]         // Static Fields        private static readonly TypeRegistry s_defaultTypeRegistry;        private static readonly Regex s_findThisKeywords;         // Static Constructor        static ValueExpressionParser()        {            // Setup default type registry for parsing value expression attributes            s_defaultTypeRegistry = new TypeRegistry();            s_defaultTypeRegistry.RegisterDefaultTypes();            s_defaultTypeRegistry.RegisterType<Guid>();            s_defaultTypeRegistry.RegisterType<UserInfo>();            s_defaultTypeRegistry.RegisterType("Common", typeof(Common));            s_defaultTypeRegistry.RegisterType("StringExtensions", typeof(StringExtensions));             // Define a regular expression to find "this" keywords            s_findThisKeywords = new Regex(@"(^this(?=[^\w]))|((?<=[^\w])this(?=[^\w]))|(^this$)", RegexOptions.Compiled | RegexOptions.Multiline);        }         // Static Properties         /// <summary>        /// Gets the default <see cref="TypeRegistry"/> instance used for evaluating <see cref="IValueExpressionAttribute"/> instances.        /// </summary>        public static TypeRegistry DefaultTypeRegistry => s_defaultTypeRegistry;         // Static Methods         /// <summary>        /// Returns a flag that determines if the "this" keyword exists with the specified <paramref name="expression"/>.        /// </summary>        /// <param name="expression">Expression to search.</param>        /// <returns><c>true</c> if "this" keyword exists in expression; otherwise, <c>false</c>.</returns>        public static bool HasThisKeywords(string expression)        {            lock (s_findThisKeywords)                return s_findThisKeywords.IsMatch(expression);        }         /// <summary>        /// Replaces references to "this" keyword with a specified <paramref name="fieldName"/>.        /// </summary>        /// <param name="expression">Expression to search.</param>        /// <param name="fieldName">Replacement value for "this" keyword usages.</param>        /// <returns>An expression with "this" keywords replaced with specified <paramref name="fieldName"/>.</returns>        public static string ReplaceThisKeywords(string expression, string fieldName)        {            lock (s_findThisKeywords)                return s_findThisKeywords.Replace(expression, fieldName);        }         /// <summary>        /// Derives an expression based on <paramref name="member"/> info with any <c>this</c>        /// keywords properly referencing <see cref="ValueExpressionScopeBase{T}.Instance"/> value.        /// </summary>        /// <param name="expression">Expression to derive, typically from <see cref="IValueExpressionAttribute.GetPropertyUpdateValue"/> or <see cref="IValueExpressionAttribute.GetExpressionUpdateValue"/>.</param>        /// <param name="valueExpressionAttribute">Associated <see cref="IValueExpressionAttribute"/> instance.</param>        /// <param name="member">Associated <see cref="MemberInfo"/> instance, typically target property for <paramref name="valueExpressionAttribute"/>.</param>        /// <param name="typeName">Modeled type name, e.g., typeof&lt;T&gt;.FullName.</param>        /// <returns>Derived expression with any <c>this</c> keywords properly referencing <see cref="ValueExpressionScopeBase{T}.Instance"/> value.</returns>        /// <exception cref="EvaluationOrderException">        /// Specified <paramref name="expression"/> references the <c>this</c> keyword and must specify a positive <see cref="IValueExpressionAttribute.EvaluationOrder"/>.        /// </exception>        /// <exception cref="ArgumentNullException">Parameter <paramref name="expression"/> cannot be <c>null</c>.</exception>        public static string DeriveExpression(string expression, IValueExpressionAttribute valueExpressionAttribute, MemberInfo member, string typeName)        {            if ((object)expression == null)                throw new ArgumentNullException(nameof(expression));             // Check for "this" keywords in expression            if (HasThisKeywords(expression))            {                if (valueExpressionAttribute.EvaluationOrder < 1)                    throw new EvaluationOrderException($"Value expression attribute for property \"{typeName}.{member.Name}\" references the \"this\" keyword and must specify a positive \"EvaluationOrder\".");                 // Replace all references to "this" with "Instance"                expression = ReplaceThisKeywords(expression, "Instance");            }             return expression;        }         #endregion    }     /// <summary>    /// Represents a typed parser for <see cref="IValueExpressionAttribute"/> instances.    /// </summary>    /// <typeparam name="T">Type of associated model.</typeparam>    public class ValueExpressionParser<T> : CompiledExpression<T>    {        #region [ Members ]         // Nested Types        private class MinimumScope : ValueExpressionScopeBase<T> { }         #endregion         #region [ Constructors ]         /// <summary>        /// Creates a new <see cref="ValueExpressionParser{T}"/>.        /// </summary>        /// <param name="expression">C# expression to be parsed.</param>        public ValueExpressionParser(string expression) : base(expression)        {            TypeRegistry = ValueExpressionParser.DefaultTypeRegistry;        }         /// <summary>        /// Creates a new <see cref="ValueExpressionParser"/> from the specified        /// <paramref name="valueExpressionAttribute"/> and <paramref name="property"/>        /// parameters deriving the base expression value from        /// <see cref="IValueExpressionAttribute.GetPropertyUpdateValue"/>.        /// </summary>        /// <param name="valueExpressionAttribute">Source <see cref="IValueExpressionAttribute"/> instance.</param>        /// <param name="property">Source <see cref="PropertyInfo"/> instance.</param>        public ValueExpressionParser(IValueExpressionAttribute valueExpressionAttribute, PropertyInfo property) : this(DeriveExpression(null, valueExpressionAttribute, property))        {        }         #endregion         #region [ Methods ]         /// <summary>        /// Parses the expression with the provided parameter expression <paramref name="scope"/> and optional <paramref name="typeRegistry"/>.        /// </summary>        /// <param name="scope">Parameter expression used to provide context to parsed instances.</param>        /// <param name="typeRegistry">        /// Type registry to use when parsing <see cref="IValueExpressionAttribute"/> instances, or <c>null</c>        /// to use <see cref="ValueExpressionParser.DefaultTypeRegistry"/>.        /// </param>        /// <param name="isCall"><c>true</c> if parsing an action; otherwise, <c>false</c> for a function.</param>        public void Parse(Expression scope, TypeRegistry typeRegistry = null, bool isCall = false)        {            if ((object)scope == null)                throw new ArgumentNullException(nameof(scope));             if ((object)typeRegistry != null)                TypeRegistry = typeRegistry;             BuildTree(scope, isCall);        }         #endregion         #region [ Static ]         // Static Fields         // Cached expression value dictionary is defined per type T to reduce contention        private static readonly Dictionary<PropertyInfo, object> s_cachedExpressionValues;        private static readonly MethodInfo s_addCachedValueMethod;        private static readonly MethodInfo s_getCachedValueMethod;         // Static Constructor        static ValueExpressionParser()        {            // Define a table of cached default value expression values            s_cachedExpressionValues = new Dictionary<PropertyInfo, object>();            Type expressionParser = typeof(ValueExpressionParser<T>);            s_addCachedValueMethod = expressionParser.GetMethod("AddCachedValue", BindingFlags.Static | BindingFlags.NonPublic);            s_getCachedValueMethod = expressionParser.GetMethod("GetCachedValue", BindingFlags.Static | BindingFlags.NonPublic);        }         // Static Methods         /// <summary>        /// Validates that any static type <typeparamref name="T"/> functionality is initialized.        /// </summary>        /// <remarks>        /// As long as type <typeparamref name="T"/> defines a parameterless constructor, this method        /// will create an instance of the modeled class so that any defined static functionality will        /// be initialized. Calling this method in advance of any of the static create or update delegate        /// generation functions will allow modeled types to self-register any custom symbols and types        /// that may be used during evaluation of value expressions attributes, e.g.:        /// <code>        /// static MyModel()        /// {        ///     TableOperations&lt;MyModel&gt;.TypeRegistry.RegisterType&lt;MyType&gt;();        /// }        /// </code>        /// </remarks>        /// <returns>        /// <c>true</c> if type <typeparamref name="T"/> supports a parameterless constructor and was        /// successfully initialized; otherwise, <c>false</c>.        /// </returns>        public static bool InitializeType()        {            // ReSharper disable once ConditionIsAlwaysTrueOrFalse            if ((object)typeof(T).GetConstructor(Type.EmptyTypes) != null)                return (object)Activator.CreateInstance<T>() != null;             return false;        }         /// <summary>        /// Generates a delegate that will create new instance of type <typeparamref name="T"/> applying any specified        /// <see cref="DefaultValueAttribute"/> or <see cref="DefaultValueExpressionAttribute"/> instances that are        /// declared on the type <typeparamref name="T"/> properties.        /// </summary>        /// <param name="properties">Specific properties to target, or <c>null</c> to target all properties.</param>        /// <param name="typeRegistry">        /// Type registry to use when parsing <see cref="DefaultValueExpressionAttribute"/> instances, or <c>null</c>        /// to use <see cref="ValueExpressionParser.DefaultTypeRegistry"/>.        /// </param>        /// <remarks>        /// This function is useful for generating a delegate to a compiled function that will create new        /// objects of type <typeparamref name="T"/> where properties of the type of have been decorated with        /// <see cref="DefaultValueAttribute"/> or <see cref="DefaultValueExpressionAttribute"/> attributes.        /// The newly created object will automatically have applied any defined default values as specified by        /// the encountered attributes.        /// <note type="note">        /// This function will assign evaluated expression values to properties in a newly created model.        /// </note>        /// </remarks>        /// <returns>        /// Generated delegate that will create new <typeparamref name="T"/> instances with default values applied.        /// </returns>        public static Func<T> CreateInstance(IEnumerable<PropertyInfo> properties = null, TypeRegistry typeRegistry = null)        {            Func<MinimumScope, T> createInstanceFunction = CreateInstance<MinimumScope>(properties, typeRegistry);            return () => createInstanceFunction(new MinimumScope());        }         /// <summary>        /// Generates a delegate that will create new instance of type <typeparamref name="T"/> applying any specified        /// <see cref="DefaultValueAttribute"/> or <typeparamref name="TValueExpressionAttribute"/> instances that are        /// declared on the type <typeparamref name="T"/> properties.        /// </summary>        /// <param name="properties">Specific properties to target, or <c>null</c> to target all properties.</param>        /// <param name="typeRegistry">        /// Type registry to use when parsing <typeparamref name="TValueExpressionAttribute"/> instances, or <c>null</c>        /// to use <see cref="ValueExpressionParser.DefaultTypeRegistry"/>.        /// </param>        /// <remarks>        /// This function is useful for generating a delegate to a compiled function that will create new        /// objects of type <typeparamref name="T"/> where properties of the type of have been decorated with        /// <see cref="DefaultValueAttribute"/> or <typeparamref name="TValueExpressionAttribute"/> attributes.        /// The newly created object will automatically have applied any defined default values as specified by        /// the encountered attributes.        /// <note type="note">        /// This function will assign evaluated expression values to properties in a newly created model.        /// </note>        /// </remarks>        /// <returns>        /// Generated delegate that will create new <typeparamref name="T"/> instances with default values applied.        /// </returns>        /// <typeparam name="TValueExpressionAttribute"><see cref="IValueExpressionAttribute"/> parameter type.</typeparam>        [SuppressMessage("Microsoft.Design", "CA1004:GenericMethodsShouldProvideTypeParameter")]        public static Func<T> CreateInstanceForType<TValueExpressionAttribute>(IEnumerable<PropertyInfo> properties = null, TypeRegistry typeRegistry = null) where TValueExpressionAttribute : Attribute, IValueExpressionAttribute        {            Func<MinimumScope, T> createInstanceFunction = CreateInstanceForType<TValueExpressionAttribute, MinimumScope>(properties, typeRegistry);            return () => createInstanceFunction(new MinimumScope());        }         /// <summary>        /// Generates a delegate that will update an instance of type <typeparamref name="T"/> applying any specified        /// <see cref="DefaultValueAttribute"/> or <see cref="DefaultValueExpressionAttribute"/> instances that are        /// declared on the type <typeparamref name="T"/> properties. Target <typeparamref name="T"/> instance is        /// accepted as the parameter to the returned delegate <see cref="Action{T}"/>.        /// </summary>        /// <param name="properties">Specific properties to target, or <c>null</c> to target all properties.</param>        /// <param name="typeRegistry">        /// Type registry to use when parsing <see cref="DefaultValueExpressionAttribute"/> instances, or <c>null</c>        /// to use <see cref="ValueExpressionParser.DefaultTypeRegistry"/>.        /// </param>        /// <remarks>        /// This function is useful for generating a delegate to a compiled function that will update        /// objects of type <typeparamref name="T"/> where properties of the type of have been decorated with        /// <see cref="DefaultValueAttribute"/> or <see cref="DefaultValueExpressionAttribute"/> attributes.        /// The updated object will automatically have applied any defined default values as specified by        /// the encountered attributes.        /// <note type="note">        /// This function will assign evaluated expression values to properties in an existing model.        /// </note>        /// </remarks>        /// <returns>        /// Generated delegate that will update <typeparamref name="T"/> instances with default values applied.        /// </returns>        public static Action<T> ApplyDefaults(IEnumerable<PropertyInfo> properties = null, TypeRegistry typeRegistry = null)        {            Action<MinimumScope> applyDefaultsFunction = ApplyDefaults<MinimumScope>(properties, typeRegistry);            return instance => applyDefaultsFunction(new MinimumScope { Instance = instance });        }         /// <summary>        /// Generates a delegate that will update an instance of type <typeparamref name="T"/> applying any specified        /// <see cref="DefaultValueAttribute"/> or <typeparamref name="TValueExpressionAttribute"/> instances that are        /// declared on the type <typeparamref name="T"/> properties. Target <typeparamref name="T"/> instance is        /// accepted as the parameter to the returned delegate <see cref="Action{T}"/>.        /// </summary>        /// <param name="properties">Specific properties to target, or <c>null</c> to target all properties.</param>        /// <param name="typeRegistry">        /// Type registry to use when parsing <typeparamref name="TValueExpressionAttribute"/> instances, or <c>null</c>        /// to use <see cref="ValueExpressionParser.DefaultTypeRegistry"/>.        /// </param>        /// <remarks>        /// This function is useful for generating a delegate to a compiled function that will update        /// objects of type <typeparamref name="T"/> where properties of the type of have been decorated with        /// <see cref="DefaultValueAttribute"/> or <typeparamref name="TValueExpressionAttribute"/> attributes.        /// The updated object will automatically have applied any defined default values as specified by        /// the encountered attributes.        /// <note type="note">        /// This function will assign evaluated expression values to properties in an existing model.        /// </note>        /// </remarks>        /// <returns>        /// Generated delegate that will update <typeparamref name="T"/> instances with default values applied.        /// </returns>        /// <typeparam name="TValueExpressionAttribute"><see cref="IValueExpressionAttribute"/> parameter type.</typeparam>        [SuppressMessage("Microsoft.Design", "CA1004:GenericMethodsShouldProvideTypeParameter")]        public static Action<T> ApplyDefaultsForType<TValueExpressionAttribute>(IEnumerable<PropertyInfo> properties = null, TypeRegistry typeRegistry = null) where TValueExpressionAttribute : Attribute, IValueExpressionAttribute        {            Action<MinimumScope> applyDefaultsFunction = ApplyDefaultsForType<TValueExpressionAttribute, MinimumScope>(properties, typeRegistry);            return instance => applyDefaultsFunction(new MinimumScope { Instance = instance });        }         /// <summary>        /// Generates a delegate that will update an instance of type <typeparamref name="T"/> applying any        /// specified <see cref="UpdateValueExpressionAttribute"/> instances that are declared on the type        /// <typeparamref name="T"/> properties. Target <typeparamref name="T"/> instance is accepted        /// as the parameter to the returned delegate <see cref="Action{T}"/>.        /// </summary>        /// <param name="properties">Specific properties to target, or <c>null</c> to target all properties.</param>        /// <param name="typeRegistry">        /// Type registry to use when parsing <see cref="UpdateValueExpressionAttribute"/> instances, or <c>null</c>        /// to use <see cref="ValueExpressionParser.DefaultTypeRegistry"/>.        /// </param>        /// <remarks>        /// This function is useful for generating a delegate to a compiled function that will update        /// objects of type <typeparamref name="T"/> where properties of the type of have been decorated        /// with <see cref="UpdateValueExpressionAttribute"/> attributes. The updated object will automatically        /// have applied any defined update values as specified by the encountered attributes.        /// <note type="note">        /// This function will assign evaluated expression values to properties in an existing model.        /// </note>        /// </remarks>        /// <returns>        /// Generated delegate that will update <typeparamref name="T"/> instances with update expression values applied.        /// </returns>        public static Action<T> UpdateInstance(IEnumerable<PropertyInfo> properties = null, TypeRegistry typeRegistry = null)        {            Action<MinimumScope> updateInstanceFunction = UpdateInstance<MinimumScope>(properties, typeRegistry);            return instance => updateInstanceFunction(new MinimumScope { Instance = instance });        }         /// <summary>        /// Generates a delegate that will update an instance of type <typeparamref name="T"/> applying any        /// specified <typeparamref name="TValueExpressionAttribute"/> instances that are declared on the type        /// <typeparamref name="T"/> properties. Target <typeparamref name="T"/> instance is accepted        /// as the parameter to the returned delegate <see cref="Action{T}"/>.        /// </summary>        /// <param name="properties">Specific properties to target, or <c>null</c> to target all properties.</param>        /// <param name="typeRegistry">        /// Type registry to use when parsing <typeparamref name="TValueExpressionAttribute"/> instances, or <c>null</c>        /// to use <see cref="ValueExpressionParser.DefaultTypeRegistry"/>.        /// </param>        /// <remarks>        /// This function is useful for generating a delegate to a compiled function that will update        /// objects of type <typeparamref name="T"/> where properties of the type of have been decorated        /// with <typeparamref name="TValueExpressionAttribute"/> attributes. The updated object will automatically        /// have applied any defined update values as specified by the encountered attributes.        /// <note type="note">        /// This function will assign evaluated expression values to properties in an existing model.        /// </note>        /// </remarks>        /// <returns>        /// Generated delegate that will update <typeparamref name="T"/> instances with update expression values applied.        /// </returns>        /// <typeparam name="TValueExpressionAttribute"><see cref="IValueExpressionAttribute"/> parameter type.</typeparam>        [SuppressMessage("Microsoft.Design", "CA1004:GenericMethodsShouldProvideTypeParameter")]        public static Action<T> UpdateInstanceForType<TValueExpressionAttribute>(IEnumerable<PropertyInfo> properties = null, TypeRegistry typeRegistry = null) where TValueExpressionAttribute : Attribute, IValueExpressionAttribute        {            Action<MinimumScope> updateInstanceFunction = UpdateInstanceForType<TValueExpressionAttribute, MinimumScope>(properties, typeRegistry);            return instance => updateInstanceFunction(new MinimumScope { Instance = instance });        }         /// <summary>        /// Generates a delegate that will execute expression assignments on an instance of type <typeparamref name="T"/>        /// where expressions are <see cref="TypeConvertedValueExpressionAttribute"/> instances that are declared        /// on the type <typeparamref name="T"/> properties. Target <typeparamref name="T"/> instance is accepted        /// as the parameter to the returned delegate <see cref="Action{T}"/>.        /// </summary>        /// <param name="properties">Specific properties to target, or <c>null</c> to target all properties.</param>        /// <param name="typeRegistry">        /// Type registry to use when parsing <see cref="TypeConvertedValueExpressionAttribute"/> instances,        /// or <c>null</c> to use <see cref="ValueExpressionParser.DefaultTypeRegistry"/>.        /// </param>        /// <remarks>        /// <para>        /// This function is useful for generating a delegate to a compiled function that will execute expression        /// assignments on objects of type <typeparamref name="T"/> where properties of the type of have been decorated        /// with <see cref="TypeConvertedValueExpressionAttribute"/> attributes. Note that the expression in the        /// <see cref="TypeConvertedValueExpressionAttribute"/> attribute is expected to evaluate to a property        /// such that it can be assigned the target type <typeparamref name="T"/> property value.        /// <note type="note">        /// This function will assign current modeled property values back to expressions, this is often useful        /// when a model is being synchronized to an external source, e.g., user interface elements.        /// </note>        /// </para>        /// <para>        /// This method is the inverse call for <see cref="UpdateProperties"/>.        /// </para>        /// </remarks>        /// <returns>        /// Generated delegate that will execute expression assignments on <typeparamref name="T"/> instances.        /// </returns>        public static Action<T> UpdateExpressions(IEnumerable<PropertyInfo> properties = null, TypeRegistry typeRegistry = null)        {            Action<MinimumScope> updateExpressionsFunction = UpdateExpressions<MinimumScope>(properties, typeRegistry);            return instance => updateExpressionsFunction(new MinimumScope { Instance = instance });        }         /// <summary>        /// Generates a delegate that will execute expression assignments on an instance of type <typeparamref name="T"/>        /// where expressions are <typeparamref name="TValueExpressionAttribute"/> instances that are declared        /// on the type <typeparamref name="T"/> properties. Target <typeparamref name="T"/> instance is accepted        /// as the parameter to the returned delegate <see cref="Action{T}"/>.        /// </summary>        /// <param name="properties">Specific properties to target, or <c>null</c> to target all properties.</param>        /// <param name="typeRegistry">        /// Type registry to use when parsing <typeparamref name="TValueExpressionAttribute"/> instances, or <c>null</c>        /// to use <see cref="ValueExpressionParser.DefaultTypeRegistry"/>.        /// </param>        /// <remarks>        /// This function is useful for generating a delegate to a compiled function that will execute expression

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