From 2a1cd4fda8a4a8e649910d16b4dfa1ce7ae63543 Mon Sep 17 00:00:00 2001
From: chai <215380520@qq.com>
Date: Fri, 12 May 2023 09:24:40 +0800
Subject: *misc

---
 .../src/CsvHelper/Expressions/RecordHydrator.cs    | 126 +++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 ThirdParty/CsvHelper-master/src/CsvHelper/Expressions/RecordHydrator.cs

(limited to 'ThirdParty/CsvHelper-master/src/CsvHelper/Expressions/RecordHydrator.cs')

diff --git a/ThirdParty/CsvHelper-master/src/CsvHelper/Expressions/RecordHydrator.cs b/ThirdParty/CsvHelper-master/src/CsvHelper/Expressions/RecordHydrator.cs
new file mode 100644
index 0000000..7de4ddb
--- /dev/null
+++ b/ThirdParty/CsvHelper-master/src/CsvHelper/Expressions/RecordHydrator.cs
@@ -0,0 +1,126 @@
+// Copyright 2009-2022 Josh Close
+// This file is a part of CsvHelper and is dual licensed under MS-PL and Apache 2.0.
+// See LICENSE.txt for details or visit http://www.opensource.org/licenses/ms-pl.html for MS-PL and http://opensource.org/licenses/Apache-2.0 for Apache 2.0.
+// https://github.com/JoshClose/CsvHelper
+using System;
+using System.Collections.Generic;
+using System.Linq.Expressions;
+using System.Reflection;
+
+namespace CsvHelper.Expressions
+{
+	/// <summary>
+	/// Hydrates members of an existing record.
+	/// </summary>
+	public class RecordHydrator
+	{
+		private readonly CsvReader reader;
+		private readonly ExpressionManager expressionManager;
+		private readonly Dictionary<Type, Delegate> hydrateRecordActions = new Dictionary<Type, Delegate>();
+
+		/// <summary>
+		/// Creates a new instance using the given reader.
+		/// </summary>
+		/// <param name="reader">The reader.</param>
+		public RecordHydrator(CsvReader reader)
+		{
+			this.reader = reader;
+			expressionManager = ObjectResolver.Current.Resolve<ExpressionManager>(reader);
+		}
+
+		/// <summary>
+		/// Hydrates members of the given record using the current reader row.
+		/// </summary>
+		/// <typeparam name="T">The record type.</typeparam>
+		/// <param name="record">The record.</param>
+		public void Hydrate<T>(T record)
+		{
+			try
+			{
+				GetHydrateRecordAction<T>()(record);
+			}
+			catch (TargetInvocationException ex)
+			{
+				if (ex.InnerException != null)
+				{
+					throw ex.InnerException;
+				}
+				else
+				{
+					throw;
+				}
+			}
+		}
+
+		/// <summary>
+		/// Gets the action delegate used to hydrate a custom class object's members with data from the reader.
+		/// </summary>
+		/// <typeparam name="T">The record type.</typeparam>
+		protected virtual Action<T> GetHydrateRecordAction<T>()
+		{
+			var recordType = typeof(T);
+
+			if (!hydrateRecordActions.TryGetValue(recordType, out Delegate action))
+			{
+				hydrateRecordActions[recordType] = action = CreateHydrateRecordAction<T>();
+			}
+
+			return (Action<T>)action;
+		}
+
+		/// <summary>
+		/// Creates the action delegate used to hydrate a record's members with data from the reader.
+		/// </summary>
+		/// <typeparam name="T">The record type.</typeparam>
+		protected virtual Action<T> CreateHydrateRecordAction<T>()
+		{
+			var recordType = typeof(T);
+
+			if (reader.Context.Maps[recordType] == null)
+			{
+				reader.Context.Maps.Add(reader.Context.AutoMap(recordType));
+			}
+
+			var mapping = reader.Context.Maps[recordType];
+
+			var recordTypeParameter = Expression.Parameter(recordType, "record");
+			var memberAssignments = new List<Expression>();
+
+			foreach (var memberMap in mapping.MemberMaps)
+			{
+				var fieldExpression = expressionManager.CreateGetFieldExpression(memberMap);
+				if (fieldExpression == null)
+				{
+					continue;
+				}
+
+				var memberTypeParameter = Expression.Parameter(memberMap.Data.Member.MemberType(), "member");
+				var memberAccess = Expression.MakeMemberAccess(recordTypeParameter, memberMap.Data.Member);
+				var memberAssignment = Expression.Assign(memberAccess, fieldExpression);
+				memberAssignments.Add(memberAssignment);
+			}
+
+			foreach (var referenceMap in mapping.ReferenceMaps)
+			{
+				if (!reader.CanRead(referenceMap))
+				{
+					continue;
+				}
+
+				var referenceAssignments = new List<MemberAssignment>();
+				expressionManager.CreateMemberAssignmentsForMapping(referenceMap.Data.Mapping, referenceAssignments);
+
+				var referenceBody = expressionManager.CreateInstanceAndAssignMembers(referenceMap.Data.Member.MemberType(), referenceAssignments);
+
+				var memberTypeParameter = Expression.Parameter(referenceMap.Data.Member.MemberType(), "referenceMember");
+				var memberAccess = Expression.MakeMemberAccess(recordTypeParameter, referenceMap.Data.Member);
+				var memberAssignment = Expression.Assign(memberAccess, referenceBody);
+				memberAssignments.Add(memberAssignment);
+			}
+
+			var body = Expression.Block(memberAssignments);
+
+			return Expression.Lambda<Action<T>>(body, recordTypeParameter).Compile();
+		}
+	}
+}
-- 
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