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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 System.Collections;
using System.Collections.Generic;
using System.Linq;
using CsvHelper.Configuration;
namespace CsvHelper.TypeConversion
{
/// <summary>
/// Converts an <see cref="IEnumerable"/> to and from a <see cref="string"/>.
/// </summary>
public class IEnumerableConverter : DefaultTypeConverter
{
/// <summary>
/// Converts the object to a string.
/// </summary>
/// <param name="value">The object to convert to a string.</param>
/// <param name="row"></param>
/// <param name="memberMapData"></param>
/// <returns>The string representation of the object.</returns>
public override string? ConvertToString(object? value, IWriterRow row, MemberMapData memberMapData)
{
var list = value as IEnumerable;
if (list == null)
{
return base.ConvertToString(value, row, memberMapData);
}
foreach (var item in list)
{
row.WriteField(item.ToString());
}
return null;
}
/// <summary>
/// Converts the string to an object.
/// </summary>
/// <param name="text">The string to convert to an object.</param>
/// <param name="row">The <see cref="IReaderRow"/> for the current record.</param>
/// <param name="memberMapData">The <see cref="MemberMapData"/> for the member being created.</param>
/// <returns>The object created from the string.</returns>
public override object? ConvertFromString(string? text, IReaderRow row, MemberMapData memberMapData)
{
var list = new List<string>();
if (memberMapData.IsNameSet || row.Configuration.HasHeaderRecord && !memberMapData.IsIndexSet)
{
// Use the name.
var nameIndex = 0;
while (true)
{
if (!row.TryGetField(memberMapData.Names.FirstOrDefault(), nameIndex, out string field))
{
break;
}
list.Add(field);
nameIndex++;
}
}
else
{
// Use the index.
var indexEnd = memberMapData.IndexEnd < memberMapData.Index
? row.Parser.Count - 1
: memberMapData.IndexEnd;
for (var i = memberMapData.Index; i <= indexEnd; i++)
{
if (row.TryGetField(i, out string field))
{
list.Add(field);
}
}
}
return list;
}
}
}
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