/// <summary>
/// Parses dates from a string. Results is set to Single if only one date was found, Two if two dates, Week if a week
/// was found ("Uke xx"), NoDate if no date was found.
/// Returns a list of dates. The list is empty if no dates were found. If a week was found, the first day of that week
/// is returned.
/// </summary>
/// <param name="date">The datestring to parse.</param>
/// <param name="results">The results of the parsing.</param>
/// <returns></returns>
public DateTime[] ParseDate(string date, out DateParseResults results)
{
results = DateParseResults.NoDate;
var dates = new List <DateTime>();
var pattern = "(\\d)?\\d\\.(\\d)?\\d\\."; // Regex pattern of the dates
var match = Regex.Match(date, pattern); // Find first match
if (match.Success)
{
// Since we found match, try to parse it to a date and add it to the dates list
DateTime dt1;
if (TryParse(match.Value, out dt1))
{
results = DateParseResults.Single;
dates.Add(dt1);
}
// See if there is another match and if the datetext contains "og" (which means there are two dates)
var nextMatch = match.NextMatch();
if (date.ToLower().Contains("og") && nextMatch.Success)
{
// Also parse this date and add it to the list
DateTime dt2;
if (TryParse(nextMatch.Value, out dt2))
{
results = DateParseResults.Two;
dates.Add(dt2);
}
}
}
else
{
// Since we couldn't find a match, see if the datestring has "uke", which means it specifies a week
if (date.ToLower().Contains("uke"))
{
// Try to parse the weeknumber to a date (the first day of that week) and add it to the dates list
DateTime dt;
if (TryParseWeekToFirstDate(date, out dt))
{
results = DateParseResults.Week;
dates.Add(dt);
}
else
{
results = DateParseResults.NoDate;
}
}
else
{
results = DateParseResults.NoDate;
}
}
return(dates.ToArray());
}
private const string ddMMyyyy_Format = "dd.MM.yyyy HH:mm:ss"; // Format for parsing date from eksamen/innlevering data
/// <summary>
/// Parses the date and time specified (to the format dd.MM.yyyy HH:mm:ss). Results gives Single on succes, NoDate on
/// fail.
/// Checks if the two strings are null.
/// </summary>
public DateTime SimpleParse(string date, string time, out DateParseResults results)
{
results = DateParseResults.NoDate;
DateTime dt;
if (date != null && time != null &&
DateTime.TryParseExact($"{date} {time}:00", ddMMyyyy_Format, CultureInfo.InvariantCulture, DateTimeStyles.None,
out dt))
{
results = DateParseResults.Single;
return(dt);
}
return(DateTime.MinValue);
}
