/// <summary>Initializes a new instance of the <see cref="CsvWriter" /> class.</summary>
/// <param name="properties">Extended properties.</param>
/// <param name="layout">The table layout.</param>
/// <param name="stream">The stream.</param>
/// <param name="closeBaseStream">if set to <c>true</c> [close base stream on close].</param>
public CsvWriter(RowLayout layout, Stream stream, CsvProperties properties = default, bool closeBaseStream = false)
{
BaseStream = stream ?? throw new ArgumentNullException(nameof(stream));
Layout = layout ?? throw new ArgumentNullException(nameof(layout));
Properties = properties.Valid ? properties : CsvProperties.Default;
CloseBaseStream = closeBaseStream;
writer = new DataWriter(stream, Properties.Encoding, Properties.NewLineMode);
if (Properties.NoHeader)
{
return;
}
// write header
for (var i = 0; i < Layout.FieldCount; i++)
{
if (i > 0)
{
writer.Write(Properties.Separator);
}
if (Properties.StringMarker.HasValue)
{
writer.Write(Properties.StringMarker.Value);
}
writer.Write(Layout[i].NameAtDatabase);
if (Properties.StringMarker.HasValue)
{
writer.Write(Properties.StringMarker.Value);
}
}
writer.WriteLine();
writer.Flush();
}
/// <summary>
/// Reads a whole list from the specified csv file.
/// </summary>
/// <param name="properties">Properties of the csv file.</param>
/// <param name="fileName">File name of the csv file.</param>
/// <returns>Returns a new <see cref="List{TStruct}"/>.</returns>
/// <typeparam name="TStruct">Structure type.</typeparam>
public static IList <TStruct> ReadList <TStruct>(CsvProperties properties, string fileName)
where TStruct : struct
{
var layout = RowLayout.CreateTyped(typeof(TStruct));
using var reader = new CsvReader(layout, fileName, properties);
return(reader.ReadList <TStruct>());
}
/// <summary>Reads a whole list from the specified csv stream.</summary>
/// <param name="properties">Properties of the csv file.</param>
/// <param name="stream">The stream.</param>
/// <returns>Returns a new <see cref="List{TStruct}" />.</returns>
/// <typeparam name="TStruct">Structure type.</typeparam>
public static List <TStruct> ReadList <TStruct>(CsvProperties properties, Stream stream)
where TStruct : struct
{
var layout = RowLayout.CreateTyped(typeof(TStruct));
using (var reader = new CsvReader(layout, stream, properties))
{
return(reader.ReadList <TStruct>());
}
}
/// <summary>Creates a new csv file with the specified name and writes the whole table.</summary>
/// <param name="table">Table to write to the csv file.</param>
/// <param name="stream">The stream to write to.</param>
/// <param name="properties">Properties of the csv file.</param>
public static void WriteTable(ITable table, Stream stream, CsvProperties properties = default)
{
if (table == null)
{
throw new ArgumentNullException(nameof(table));
}
var writer = new CsvWriter(table.Layout, stream, properties);
try
{
writer.Write(table);
}
finally
{
writer.Close();
}
}
/// <summary>Parses a single row of data from the specified string.</summary>
/// <param name="properties">The csv properties.</param>
/// <param name="layout">The row layout.</param>
/// <param name="data">The buffer to parse.</param>
/// <returns>Returns a new <see cref="Row" /> instance.</returns>
public static Row ParseRow(CsvProperties properties, RowLayout layout, string data)
{
try
{
var fieldCount = layout.FieldCount;
var fieldNumber = 0;
var ident = new Queue <char>();
var identInARowCount = 0;
var currentValue = new List <char>();
var i = -1;
var values = new object[fieldCount];
while (fieldNumber < fieldCount)
{
++i;
if ((i == data.Length) && (fieldNumber == (fieldCount - 1)))
{
break;
}
if (i >= data.Length)
{
throw new InvalidDataException("Unexpected end of input!");
}
if (properties.Separator == data[i])
{
if (ident.Count == 0)
{
identInARowCount = 0;
if (properties.StringMarker.HasValue)
{
values[fieldNumber] = layout.ParseValue(fieldNumber, new string(currentValue.ToArray()).Unescape(),
properties.StringMarker.Value.ToString(), properties.Format);
}
else
{
values[fieldNumber] = layout.ParseValue(fieldNumber, new string(currentValue.ToArray()).Unescape(), string.Empty,
properties.Format);
}
fieldNumber++;
currentValue.Clear();
continue;
}
}
if (properties.StringMarker == data[i])
{
identInARowCount++;
if ((ident.Count > 0) && (ident.Peek() == data[i]))
{
ident.Dequeue();
if (identInARowCount > 1)
{
// escaped char
currentValue.Add(data[i]);
}
}
else
{
ident.Enqueue(data[i]);
}
}
else
{
identInARowCount = 0;
currentValue.Add(data[i]);
}
}
if (ident.Count > 0)
{
throw new InvalidDataException("Invalid ident/escaping!");
}
if (properties.StringMarker.HasValue)
{
values[fieldNumber] = layout.ParseValue(fieldNumber, new string(currentValue.ToArray()).Unescape(),
properties.StringMarker.Value.ToString(), properties.Format);
}
else
{
values[fieldNumber] = layout.ParseValue(fieldNumber, new string(currentValue.ToArray()).Unescape(), string.Empty, properties.Format);
}
fieldNumber++;
if (i < data.Length)
{
if (properties.Separator == data[i])
{
i++;
}
if (i < data.Length)
{
throw new InvalidDataException("Additional data at end of line!");
}
}
return(new Row(layout, values, false));
}
catch (EndOfStreamException)
{
if (data.Length > 0)
{
throw;
}
return(null);
}
catch (Exception ex)
{
throw new InvalidDataException("Error while reading row data!", ex);
}
}
/// <summary>Initializes a new instance of the <see cref="CsvReader" /> class.</summary>
/// <param name="properties">Properties to apply to the reader.</param>
/// <param name="layout">Layout to use when reading the csv data.</param>
/// <param name="stream">Stream to read data from.</param>
/// <param name="closeBaseStream">if set to <c>true</c> [close base stream on close].</param>
public CsvReader(RowLayout layout, Stream stream, CsvProperties properties = default, bool closeBaseStream = false)
{
Layout = layout;
BaseStream = stream ?? throw new ArgumentNullException(nameof(stream));
Properties = properties.Valid ? properties : CsvProperties.Default;
CloseBaseStream = closeBaseStream;
reader = new DataReader(stream, Properties.Encoding, Properties.NewLineMode);
if (!Properties.NoHeader)
{
var header = reader.ReadLine();
currentRowNumber++;
var fields = header.Split(Properties.Separator);
if (!Properties.AllowFieldMatching)
{
if (fields.Length != Layout.FieldCount)
{
if ((fields.Length - 1) != Layout.FieldCount)
{
throw new InvalidDataException($"Invalid header fieldcount (expected '{Layout.FieldCount}' got '{fields.Length}')!");
}
}
}
else
{
if (fields.Length != Layout.FieldCount)
{
fieldNumberMatching = new int[Layout.FieldCount];
}
}
var count = Math.Min(Layout.FieldCount, fields.Length);
for (var i = 0; i < count; i++)
{
var fieldName = fields[i].UnboxText(false);
var fieldIndex = Layout.GetFieldIndex(fieldName, false);
if (fieldIndex < 0)
{
throw new InvalidDataException(
$"Error loading CSV Header! Got field name '{fieldName}' instead of '{Layout[i].Name}' at type '{Layout.Name}'");
}
if (!Properties.AllowFieldMatching)
{
if (fieldIndex != i)
{
throw new InvalidDataException($"Fieldposition of Field '{fieldName}' does not match!");
}
if (!string.Equals(Layout[fieldIndex].Name, fieldName))
{
throw new InvalidDataException(
$"Invalid header value at field number '{i}' name '{fieldName}' expected '{Layout[fieldIndex].Name}'!");
}
}
else
{
if ((fieldNumberMatching == null) && (fieldIndex != i))
{
fieldNumberMatching = new int[Layout.FieldCount];
}
}
}
if (fieldNumberMatching != null)
{
var i = 0;
for (; i < count; i++)
{
var fieldName = fields[i].UnboxText(false);
fieldNumberMatching[i] = Layout.GetFieldIndex(fieldName, false);
}
for (; i < Layout.FieldCount; i++)
{
fieldNumberMatching[i] = -1;
}
}
}
}
/// <summary>Initializes a new instance of the <see cref="CsvReader" /> class.</summary>
/// <param name="properties">Properties to apply to the reader.</param>
/// <param name="layout">Layout to use when reading from the csv file.</param>
/// <param name="fileName">Filename to write to.</param>
public CsvReader(RowLayout layout, string fileName, CsvProperties properties = default)
: this(layout, File.OpenRead(fileName), properties, true)
{
}
/// <summary>Initializes a new instance of the <see cref="CsvWriter" /> class.</summary>
/// <param name="layout">The table layout.</param>
/// <param name="fileName">Filename to write to.</param>
/// <param name="properties">Extended properties.</param>
public CsvWriter(RowLayout layout, string fileName, CsvProperties properties = default)
: this(layout, File.Create(fileName), properties, true)
{
}
/// <summary>Creates a new csv file with the specified name and writes the whole table.</summary>
/// <param name="rows">Table to write to the csv file.</param>
/// <param name="fileName">File name of the csv file.</param>
/// <param name="properties">Properties of the csv file.</param>
/// <typeparam name="TStruct">Structure type.</typeparam>
public static void WriteAlien <TStruct>(IEnumerable <TStruct> rows, string fileName, CsvProperties properties = default)
where TStruct : struct
{
var layout = RowLayout.CreateAlien(typeof(TStruct), false);
var writer = new CsvWriter(layout, fileName, properties);
try
{
writer.Write(rows);
}
finally
{
writer.Close();
}
}
/// <summary>Creates a string representation of the specified row.</summary>
/// <param name="properties">The csv properties.</param>
/// <param name="layout">The row layout.</param>
/// <param name="row">The row.</param>
/// <returns>Returns a new string representing the row.</returns>
public static string RowToString(CsvProperties properties, RowLayout layout, Row row)
{
var result = new StringBuilder();
var values = row.Values;
for (var i = 0; i < layout.FieldCount; i++)
{
if (i > 0)
{
result.Append(properties.Separator);
}
if ((values != null) && (values[i] != null))
{
var field = layout[i];
switch (field.DataType)
{
case DataType.Binary:
{
var str = Base64.NoPadding.Encode((byte[])values[i]);
result.Append(str);
break;
}
case DataType.Bool:
case DataType.Int8:
case DataType.Int16:
case DataType.Int32:
case DataType.Int64:
case DataType.UInt8:
case DataType.UInt16:
case DataType.UInt32:
case DataType.UInt64:
{
if (!properties.SaveDefaultValues && values[i].Equals(0))
{
break;
}
var str = values[i].ToString();
result.Append(str);
break;
}
case DataType.Char:
{
if (!properties.SaveDefaultValues && values[i].Equals((char)0))
{
break;
}
var str = values[i].ToString();
result.Append(str);
break;
}
case DataType.Decimal:
{
if (!properties.SaveDefaultValues && values[i].Equals(0m))
{
break;
}
var value = (decimal)values[i];
result.Append(value.ToString(properties.Format));
break;
}
case DataType.Single:
{
if (!properties.SaveDefaultValues && values[i].Equals(0f))
{
break;
}
var value = (float)values[i];
result.Append(value.ToString("R", properties.Format));
break;
}
case DataType.Double:
{
if (!properties.SaveDefaultValues && values[i].Equals(0d))
{
break;
}
var value = (double)values[i];
result.Append(value.ToString("R", properties.Format));
break;
}
case DataType.TimeSpan:
{
if (!properties.SaveDefaultValues && values[i].Equals(TimeSpan.Zero))
{
break;
}
var str = field.GetString(values[i], $"{properties.StringMarker}", properties.Format);
result.Append(str);
break;
}
case DataType.DateTime:
{
if (!properties.SaveDefaultValues && values[i].Equals(new DateTime(0)))
{
break;
}
string str;
if (properties.DateTimeFormat != null)
{
str = ((DateTime)values[i]).ToString(properties.DateTimeFormat, properties.Format);
}
else
{
str = field.GetString(values[i], $"{properties.StringMarker}", properties.Format);
}
result.Append(str);
break;
}
case DataType.User:
case DataType.String:
{
if (!properties.SaveDefaultValues && values[i].Equals(string.Empty))
{
break;
}
var str = values[i] == null ? string.Empty : values[i].ToString();
str = str.EscapeUtf8();
if (properties.StringMarker.HasValue)
{
str = str.Replace($"{properties.StringMarker}", $"{properties.StringMarker}{properties.StringMarker}");
result.Append(properties.StringMarker);
}
if (str.Length == 0)
{
result.Append(" ");
}
else
{
if (properties.StringMarker.HasValue)
{
if (str.StartsWith(properties.StringMarker.ToString()))
{
result.Append(" ");
}
}
result.Append(str);
if (properties.StringMarker.HasValue)
{
if (str.EndsWith(properties.StringMarker.ToString()))
{
result.Append(" ");
}
}
}
if (properties.StringMarker.HasValue)
{
result.Append(properties.StringMarker);
}
break;
}
case DataType.Enum:
{
if (!properties.SaveDefaultValues && Convert.ToInt32(values[i]).Equals(0))
{
break;
}
var str = values[i].ToString();
result.Append(str);
break;
}
default:
throw new NotImplementedException($"DataType {layout[i].DataType} is not implemented!");
}
}
}
return(result.ToString());
}
