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// 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 CsvHelper.Configuration;
using CsvHelper.TypeConversion;
using System;
using System.Linq.Expressions;
namespace CsvHelper.Expressions
{
/// <summary>
/// Writes primitives.
/// </summary>
public class PrimitiveRecordWriter : RecordWriter
{
/// <summary>
/// Initializes a new instance using the given writer.
/// </summary>
/// <param name="writer">The writer.</param>
public PrimitiveRecordWriter(CsvWriter writer) : base(writer) { }
/// <summary>
/// Creates a <see cref="Delegate"/> of type <see cref="Action{T}"/>
/// that will write the given record using the current writer row.
/// </summary>
/// <typeparam name="T">The record type.</typeparam>
/// <param name="record">The record.</param>
protected override Action<T> CreateWriteDelegate<T>(T record)
{
var type = Writer.GetTypeForRecord(record);
var recordParameter = Expression.Parameter(typeof(T), "record");
Expression fieldExpression = Expression.Convert(recordParameter, typeof(object));
var typeConverter = Writer.Context.TypeConverterCache.GetConverter(type);
var typeConverterExpression = Expression.Constant(typeConverter);
var method = typeof(ITypeConverter).GetMethod(nameof(ITypeConverter.ConvertToString));
var memberMapData = new MemberMapData(null)
{
Index = 0,
TypeConverter = typeConverter,
TypeConverterOptions = TypeConverterOptions.Merge(new TypeConverterOptions(), Writer.Context.TypeConverterOptionsCache.GetOptions(type))
};
memberMapData.TypeConverterOptions.CultureInfo = Writer.Configuration.CultureInfo;
fieldExpression = Expression.Call(typeConverterExpression, method, fieldExpression, Expression.Constant(Writer), Expression.Constant(memberMapData));
fieldExpression = Expression.Call(Expression.Constant(Writer), nameof(Writer.WriteConvertedField), null, fieldExpression, Expression.Constant(type));
var action = Expression.Lambda<Action<T>>(fieldExpression, recordParameter).Compile();
return action;
}
}
}
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