private static IImmutableSet <DayOfWeekSpecified> GetWeekOfDaySet(string values, bool isMonth)
{
if (string.IsNullOrEmpty(values))
{
return(ImmutableHashSet <DayOfWeekSpecified> .Empty.AddRange(GetAllEnums <DayOfWeek>().Select(day => new DayOfWeekSpecified(day, 0))));
}
var seed = ReductionState <DayOfWeekSpecified> .Default();
// https://regex101.com/r/lbGStS/2
RegexOptions options = RegexOptions.IgnoreCase;
string input = values.Substring(1, values.Length - 2);
string pattern = $"([+])|([Mo|Tu|We|Th|Fr|Sa|Su]+{GetSpecifierRegexPattern(isMonth)})";
return(Regex.Matches(input, pattern, options)
.Cast <Match>()
.Select(match => match.Value)
.Aggregate(seed, (accu, current) =>
{
if (current == "+")
{
return new ReductionState <DayOfWeekSpecified>(accu.Reduction, Operator.Add);
}
var operand = DayOfWeekSpecifiedFromValue(current, isMonth);
return new ReductionState <DayOfWeekSpecified>(accu.Reduction.Add(operand), accu.Op);
})
.Reduction);
}
private static IImmutableSet <int> GetTimesSet(string values, int start, int end)
{
if (string.IsNullOrEmpty(values))
{
return(ImmutableHashSet <int> .Empty.AddRange(Enumerable.Range(start, end - start + 1)));
}
var seed = ReductionState <int> .Default();
// https://regex101.com/r/P8yGDm/2
RegexOptions options = RegexOptions.IgnoreCase;
string input = values.Substring(1, values.Length - 2);
string pattern = @"([+\-])|(\d{1,4})";
return(Regex.Matches(input, pattern, options)
.Cast <Match>()
.Select(match => match.Value)
.Aggregate(seed, (accu, current) =>
{
if (current == "+" || current == "-")
{
return new ReductionState <int>(accu.Reduction, (current == "+") ? Operator.Add : Operator.Range);
}
var operand = Convert.ToInt32(current);
if (accu.Op == Operator.Add)
{
return new ReductionState <int>(accu.Reduction.Add(operand), accu.Op);
}
else if (accu.Reduction.Count == 0)
{
return new ReductionState <int>(accu.Reduction.Add(-operand), Operator.Add);
}
var lastOperand = accu.Reduction.Last();
var range = GetRange(lastOperand, operand);
return new ReductionState <int>(accu.Reduction.AddRange(range), Operator.Add);
})
.Reduction);
}
private static IImmutableSet <DayOfWeek> GetWeekOfDaySet(string values)
{
if (string.IsNullOrEmpty(values))
{
return(ImmutableHashSet <DayOfWeek> .Empty.AddRange(GetAllEnums <DayOfWeek>()));
}
var seed = ReductionState <DayOfWeek> .Default();
// https://regex101.com/r/4NRHND/2
RegexOptions options = RegexOptions.IgnoreCase;
string input = values.Substring(1, values.Length - 2);
string pattern = @"([+\-])|(Mo|Tu|We|Th|Fr|Sa|Su)";
return(Regex.Matches(input, pattern, options)
.Cast <Match>()
.Select(match => match.Value)
.Aggregate(seed, (accu, current) =>
{
if (current == "+" || current == "-")
{
return new ReductionState <DayOfWeek>(accu.Reduction, (current == "+") ? Operator.Add : Operator.Range);
}
var operand = GetDayOfWeekFrom(current);
if (accu.Op == Operator.Add)
{
return new ReductionState <DayOfWeek>(accu.Reduction.Add(operand), accu.Op);
}
var lastOperand = accu.Reduction.Last();
var range = GetRange(lastOperand, operand);
return new ReductionState <DayOfWeek>(accu.Reduction.AddRange(range), Operator.Add);
})
.Reduction);
}
