"csv parser c#" Code Answer's
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csv parser c#
Inexpensive Ibex
on Jan 21, 2021
public static class CsvParser
{
private static Tuple<T, IEnumerable<T>> HeadAndTail<T>(this IEnumerable<T> source)
{
if (source == null)
throw new ArgumentNullException("source");
var en = source.GetEnumerator();
en.MoveNext();
return Tuple.Create(en.Current, EnumerateTail(en));
}
private static IEnumerable<T> EnumerateTail<T>(IEnumerator<T> en)
{
while (en.MoveNext()) yield return en.Current;
}
public static IEnumerable<IList<string>>
Parse(string content, char delimiter, char qualifier)
{
using (var reader = new StringReader(content))
return Parse(reader, delimiter, qualifier);
}
public static Tuple<IList<string>, IEnumerable<IList<string>>>
ParseHeadAndTail(TextReader reader, char delimiter, char qualifier)
{
return HeadAndTail(Parse(reader, delimiter, qualifier));
}
public static IEnumerable<IList<string>>
Parse(TextReader reader, char delimiter, char qualifier)
{
var inQuote = false;
var record = new List<string>();
var sb = new StringBuilder();
while (reader.Peek() != -1)
{
var readChar = (char) reader.Read();
if (readChar == '\n' || (readChar == '\r' && (char) reader.Peek() == '\n'))
{
// If it's a \r\n combo consume the \n part and throw it away.
if (readChar == '\r')
reader.Read();
if (inQuote)
{
if (readChar == '\r')
sb.Append('\r');
sb.Append('\n');
}
else
{
if (record.Count > 0 || sb.Length > 0)
{
record.Add(sb.ToString());
sb.Clear();
}
if (record.Count > 0)
yield return record;
record = new List<string>(record.Count);
}
}
else if (sb.Length == 0 && !inQuote)
{
if (readChar == qualifier)
inQuote = true;
else if (readChar == delimiter)
{
record.Add(sb.ToString());
sb.Clear();
}
else if (char.IsWhiteSpace(readChar))
{
// Ignore leading whitespace
}
else
sb.Append(readChar);
}
else if (readChar == delimiter)
{
if (inQuote)
sb.Append(delimiter);
else
{
record.Add(sb.ToString());
sb.Clear();
}
}
else if (readChar == qualifier)
{
if (inQuote)
{
if ((char) reader.Peek() == qualifier)
{
reader.Read();
sb.Append(qualifier);
}
else
inQuote = false;
}
else
sb.Append(readChar);
}
else
sb.Append(readChar);
}
if (record.Count > 0 || sb.Length > 0)
record.Add(sb.ToString());
if (record.Count > 0)
yield return record;
}
}Source: www.codeproject.com
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