public void Format(CrontabField field, TextWriter writer, bool noNames)
{
if (field == null)
{
throw new ArgumentNullException(nameof(field));
}
if (writer == null)
{
throw new ArgumentNullException(nameof(writer));
}
var next = field.GetFirst();
var count = 0;
while (next != -1)
{
var first = next;
int last;
do
{
last = next;
next = field.Next(last + 1);
} while (next - last == 1);
if (count == 0 &&
first == MinValue && last == MaxValue)
{
writer.Write('*');
return;
}
if (count > 0)
{
writer.Write(',');
}
if (first == last)
{
FormatValue(first, writer, noNames);
}
else
{
FormatValue(first, writer, noNames);
writer.Write('-');
FormatValue(last, writer, noNames);
}
count++;
}
}
private CrontabSchedule(string expression)
{
Debug.Assert(expression != null);
var fields = expression.Split(Separators, StringSplitOptions.RemoveEmptyEntries);
if (fields.Length != 5)
{
throw new FormatException($"'{expression}' is not a valid crontab expression. " +
"It must contain at least 5 components of a schedule (in the sequence of minutes, hours, days, months, days of week).");
}
minutes = CrontabField.Minutes(fields[0]);
hours = CrontabField.Hours(fields[1]);
days = CrontabField.Days(fields[2]);
months = CrontabField.Months(fields[3]);
daysOfWeek = CrontabField.DaysOfWeek(fields[4]);
}