public static DataSinkStream Create(DataTable table, TextWriter writer)
{
var ds = new DataSinkStream()
{
_table = table,
_writer = writer,
MaxWidth = 79,
Lines = new List <string>(),
};
return(ds);
}
// special for tables
public TextValue PrettyPrint(TypedValue value)
{
Logger.Assert(value.DataType.IsVariable, "pp non-var");
Logger.WriteLine(3, "PrettyPrint {0}", value);
var sb = new StringBuilder();
if (value.DataType is DataTypeRelation)
{
var dss = DataSinkStream.Create(value.AsTable(), new StringWriter(sb));
dss.OutputTable();
}
else
{
sb.Append($"{value.Format()} : {value.DataType}");
}
var ret = TextValue.Create(sb.ToString());
Logger.WriteLine(3, "[PP]");
return(ret);
}
// Internal table writer, called recursively
void WriteTable()
{
if (_table.Degree == 0)
{
WriteLine(_table.GetCount() == 0 ? T0 : T1);
return;
}
var rowvalues = new List <object[]>();
int[] widths = _table.Heading.Columns.Select(c => ColumnWidth(c)).ToArray();
bool[] rjust = _table.Heading.Columns.Select(c => RightJustify(c.DataType.Name)).ToArray();
foreach (var row in _table.GetRows())
{
var rowval = new object[_table.Degree];
for (var col = 0; col < _table.Degree; ++col)
{
var dtype = _table.Heading.Columns[col].DataType;
var value = row.Values[col];
if (dtype is DataTypeRelation)
{
var sink = DataSinkStream.Create(value.AsTable(), _writer);
sink.WriteTable();
rowval[col] = sink;
widths[col] = Math.Max(widths[col], sink._width);
}
else
{
var val = value.ToString();
if (val.Length > MaxColumnWidth)
{
var s = String.Format("(...{0})", val.Length);
val = val.Substring(0, MaxColumnWidth - s.Length) + s;
}
rowval[col] = val;
widths[col] = Math.Max(widths[col], val.Length);
}
}
rowvalues.Add(rowval);
}
WriteLine(String.Join(_colsep,
_table.Heading.Columns.Zip(widths, (c, w) => c.Name.PadRight(w))));
WriteLine(new string(_rowsep[0], widths.Sum() + (widths.Length - 1) * _colsep.Length));
foreach (var rowvalue in rowvalues)
{
var more = true;
for (int subrow = 0; more; subrow++)
{
more = false;
string[] vv = new string[_table.Degree];
for (int col = 0; col < _table.Degree; ++col)
{
if (rowvalue[col] is string)
{
vv[col] = (subrow == 0) ? rowvalue[col] as string : "";
}
else
{
var dss = rowvalue[col] as DataSinkStream;
vv[col] = (subrow < dss.Lines.Count) ? dss.Lines[subrow] : "";
if (subrow + 1 < dss.Lines.Count)
{
more = true;
}
}
}
WriteLine(String.Join(_colsep, Enumerable.Range(0, vv.Length).Select(x => PadToWidth(vv[x], widths[x], rjust[x]))));
}
}
}
