private static string[] GetHeaders(string line, CsvOptions options)
{
return(Trim(SplitLine(line, options), options));
}
public ReadLine(string[] headers, Dictionary <string, int> headerLookup, int index, string raw, CsvOptions options)
{
this.headerLookup = headerLookup;
this.options = options;
Headers = headers;
Raw = raw;
Index = index;
}
private static IEnumerable <ICsvLine> ReadImpl(TextReader reader, CsvOptions options)
{
if (options == null)
{
options = new CsvOptions();
}
string line;
var index = 0;
string[] headers = null;
Dictionary <string, int> headerLookup = null;
var initalized = false;
while ((line = reader.ReadLine()) != null)
{
index++;
if (index <= options.RowsToSkip || options.SkipRow?.Invoke(line, index) == true)
{
continue;
}
if (!initalized)
{
InitializeOptions(line, options);
var skipInitialLine = options.HeaderMode == HeaderMode.HeaderPresent;
headers = skipInitialLine ? GetHeaders(line, options) : CreateDefaultHeaders(line, options);
try
{
headerLookup = headers.Select((h, idx) => Tuple.Create(h, idx)).ToDictionary(h => h.Item1, h => h.Item2, options.Comparer);
}
catch (ArgumentException)
{
throw new InvalidOperationException("Duplicate headers detected in HeaderPresent mode. If you don't have a header you can set the HeaderMode to HeaderAbsent.");
}
var aliases = options.Aliases;
if (aliases != null)
{
// NOTE: For each group we need at most 1 match (i.e. SingleOrDefault)
foreach (var aliasGroup in aliases)
{
var groupIndex = -1;
foreach (var alias in aliasGroup)
{
int aliasIndex;
if (headerLookup.TryGetValue(alias, out aliasIndex))
{
if (groupIndex != -1)
{
throw new InvalidOperationException("Found multiple matches within alias group: " + string.Join(";", aliasGroup));
}
groupIndex = aliasIndex;
}
}
if (groupIndex != -1)
{
foreach (var alias in aliasGroup)
{
headerLookup[alias] = groupIndex;
}
}
}
}
initalized = true;
if (skipInitialLine)
{
continue;
}
}
var record = new ReadLine(headers, headerLookup, index, line, options);
if (options.AllowNewLineInEnclosedFieldValues)
{
while (record.RawSplitLine.Any(f => IsUnterminatedQuotedValue(f, options)))
{
var nextLine = reader.ReadLine();
if (nextLine == null)
{
break;
}
line += options.NewLine + nextLine;
record = new ReadLine(headers, headerLookup, index, line, options);
}
}
yield return(record);
}
}
