private static string ComsumeQuoted(CsvSplitInfo info, StringEnumWithPeek readMe)
{
info.FieldExpected = false;
var sb = new StringBuilder();
sb.Append('"');
while (readMe.MoveNext())
{
// null not possible with inside a MoveNext loop
var item = readMe.Current.Value;
if (item == '"')
{
var nextItem = readMe.PeekNext();
if (nextItem == '"')
{
sb.Append('"');
readMe.MoveNext();
continue;
}
sb.Append('"');
return(sb.ToString());
}
sb.Append(item);
}
sb.Append('"');
return(sb.ToString());
}
private static string ConsumeNoQuoted(CsvSplitInfo info, char starter, StringEnumWithPeek readMe)
{
info.FieldExpected = false;
var sb = new StringBuilder();
sb.Append(starter);
while (readMe.MoveNext())
{
// null not possible with inside a MoveNext loop
var item = readMe.Current.Value;
if (item == ',')
{
info.FieldExpected = true;
// Remove ending spaces on No Quoted Fields
return(sb.ToString().Trim());
}
sb.Append(item);
}
// Remove ending spaces on No Quoted Fields
return(sb.ToString().Trim());
}
private static void GoToNextItem(CsvSplitInfo info, StringEnumWithPeek readMe)
{
while (readMe.MoveNext())
{
// null not possible with inside a MoveNext loop
var item = readMe.Current.Value;
if (item == ',')
{
info.FieldExpected = true;
return;
}
}
}
public static List <string> Split(string text)
{
var result = new List <string>();
var readMe = new StringEnumWithPeek(text);
var info = new CsvSplitInfo();
info.FieldExpected = false;
while (readMe.MoveNext())
{
// null not possible with inside a MoveNext loop
var item = readMe.Current.Value;
if (item == ' ')
{
continue;
}
if (item == ',')
{
result.Add(string.Empty);
info.FieldExpected = true;
continue;
}
if (item == '"')
{
var quotedItem = ComsumeQuoted(info, readMe);
result.Add(quotedItem);
GoToNextItem(info, readMe);
continue;
}
var unquotedItem = ConsumeNoQuoted(info, item, readMe);
result.Add(unquotedItem);
}
// ending comma situation
if (info.FieldExpected)
{
result.Add(string.Empty);
}
return(result);
}