private IEnumerable <DataSourceValueGroup> ExecuteSeriesFunction(Target sourceTarget, Tuple <SeriesFunction, string, GroupOperation> parsedFunction, DateTime startTime, DateTime stopTime, string interval, bool decimate, bool dropEmptySeries, CancellationToken cancellationToken)
{
SeriesFunction seriesFunction = parsedFunction.Item1;
string expression = parsedFunction.Item2;
GroupOperation groupOperation = parsedFunction.Item3;
// Parse out function parameters and target expression
Tuple <string[], string> expressionParameters = TargetCache <Tuple <string[], string> > .GetOrAdd(expression, () =>
{
List <string> parsedParameters = new List <string>();
// Extract any required function parameters
int requiredParameters = s_requiredParameters[seriesFunction]; // Safe: no lock needed since content doesn't change
// Any slice operation adds one required parameter for time tolerance
if (groupOperation == GroupOperation.Slice)
{
requiredParameters++;
}
if (requiredParameters > 0)
{
int index = 0;
for (int i = 0; i < requiredParameters && index > -1; i++)
{
index = expression.IndexOf(',', index + 1);
}
if (index > -1)
{
parsedParameters.AddRange(expression.Substring(0, index).Split(','));
}
if (parsedParameters.Count == requiredParameters)
{
expression = expression.Substring(index + 1).Trim();
}
else
{
throw new FormatException($"Expected {requiredParameters + 1} parameters, received {parsedParameters.Count + 1} in: {(groupOperation == GroupOperation.None ? "" : groupOperation.ToString())}{seriesFunction}({expression})");
}
}
// Extract any provided optional function parameters
int optionalParameters = s_optionalParameters[seriesFunction]; // Safe: no lock needed since content doesn't change
bool hasSubExpression(string target) => target.StartsWith("FILTER", StringComparison.OrdinalIgnoreCase) || target.Contains("(");
if (optionalParameters > 0)
{
int index = expression.IndexOf(',');
int lastIndex;
if (index > -1 && !hasSubExpression(expression.Substring(0, index)))
{
lastIndex = index;
for (int i = 1; i < optionalParameters && index > -1; i++)
{
index = expression.IndexOf(',', index + 1);
if (index > -1 && hasSubExpression(expression.Substring(lastIndex + 1, index - lastIndex - 1).Trim()))
{
index = lastIndex;
break;
}
lastIndex = index;
}
if (index > -1)
{
parsedParameters.AddRange(expression.Substring(0, index).Split(','));
expression = expression.Substring(index + 1).Trim();
}
}
}
return(new Tuple <string[], string>(parsedParameters.ToArray(), expression));
});
string[] parameters = expressionParameters.Item1;
string queryExpression = expressionParameters.Item2; // Final function parameter is always target expression
// When accurate calculation results are requested, query data source at full resolution
if (seriesFunction == SeriesFunction.Interval && ParseFloat(parameters[0]) == 0.0D)
{
decimate = false;
}
// Query function expression to get series data
IEnumerable <DataSourceValueGroup> dataset = QueryTarget(sourceTarget, queryExpression, startTime, stopTime, interval, decimate, dropEmptySeries, cancellationToken);
// Handle label function as a special edge case - group operations on label are ignored
if (seriesFunction == SeriesFunction.Label)
{
// Derive labels
string label = parameters[0];
if (label.StartsWith("\"") || label.StartsWith("'"))
{
label = label.Substring(1, label.Length - 2);
}
DataSourceValueGroup[] valueGroups = dataset.ToArray();
string[] seriesLabels = new string[valueGroups.Length];
for (int i = 0; i < valueGroups.Length; i++)
{
string target = valueGroups[i].RootTarget;
seriesLabels[i] = TargetCache <string> .GetOrAdd($"{label}@{target}", () =>
{
string table, derivedLabel;
string[] components = label.Split('.');
if (components.Length == 2)
{
table = components[0].Trim();
derivedLabel = components[1].Trim();
}
else
{
table = "ActiveMeasurements";
derivedLabel = label;
}
DataRow record = target.MetadataRecordFromTag(Metadata, table);
if (record != null && derivedLabel.IndexOf('{') >= 0)
{
foreach (string fieldName in record.Table.Columns.Cast <DataColumn>().Select(column => column.ColumnName))
{
derivedLabel = derivedLabel.ReplaceCaseInsensitive($"{{{fieldName}}}", record[fieldName].ToString());
}
}
// ReSharper disable once AccessToModifiedClosure
if (derivedLabel.Equals(label, StringComparison.Ordinal))
{
derivedLabel = $"{label}{(valueGroups.Length > 1 ? $" {i + 1}" : "")}";
}
return(derivedLabel);
});
}
// Verify that all series labels are unique
if (seriesLabels.Length > 1)
{
HashSet <string> uniqueLabelSet = new HashSet <string>(StringComparer.OrdinalIgnoreCase);
for (int i = 0; i < seriesLabels.Length; i++)
{
while (uniqueLabelSet.Contains(seriesLabels[i]))
{
seriesLabels[i] = $"{seriesLabels[i]}\u00A0"; // Suffixing with non-breaking space for label uniqueness
}
uniqueLabelSet.Add(seriesLabels[i]);
}
}
for (int i = 0; i < valueGroups.Length; i++)
{
yield return(new DataSourceValueGroup
{
Target = seriesLabels[i],
RootTarget = valueGroups[i].RootTarget,
SourceTarget = sourceTarget,
Source = valueGroups[i].Source,
DropEmptySeries = dropEmptySeries
});
}
}
else
{
switch (groupOperation)
{
case GroupOperation.Set:
{
// Flatten all series into a single enumerable
DataSourceValueGroup valueGroup = new DataSourceValueGroup
{
Target = $"Set{seriesFunction}({string.Join(", ", parameters)}{(parameters.Length > 0 ? ", " : "")}{queryExpression})",
RootTarget = queryExpression,
SourceTarget = sourceTarget,
Source = ExecuteSeriesFunctionOverSource(dataset.AsParallel().WithCancellation(cancellationToken).SelectMany(source => source.Source), seriesFunction, parameters),
DropEmptySeries = dropEmptySeries
};
// Handle edge-case set operations - for these functions there is data in the target series as well
if (seriesFunction == SeriesFunction.Minimum || seriesFunction == SeriesFunction.Maximum || seriesFunction == SeriesFunction.Median)
{
DataSourceValue dataValue = valueGroup.Source.First();
valueGroup.Target = $"Set{seriesFunction} = {dataValue.Target}";
valueGroup.RootTarget = dataValue.Target;
}
yield return(valueGroup);
break;
}
case GroupOperation.Slice:
{
TimeSliceScanner scanner = new TimeSliceScanner(dataset, ParseFloat(parameters[0]) / SI.Milli);
parameters = parameters.Skip(1).ToArray();
foreach (DataSourceValueGroup valueGroup in ExecuteSeriesFunctionOverTimeSlices(scanner, seriesFunction, parameters, cancellationToken))
{
yield return(new DataSourceValueGroup
{
Target = $"Slice{seriesFunction}({string.Join(", ", parameters)}{(parameters.Length > 0 ? ", " : "")}{valueGroup.Target})",
RootTarget = valueGroup.RootTarget ?? valueGroup.Target,
SourceTarget = sourceTarget,
Source = valueGroup.Source,
DropEmptySeries = dropEmptySeries
});
}
break;
}
default:
{
foreach (DataSourceValueGroup valueGroup in dataset)
{
yield return(new DataSourceValueGroup
{
Target = $"{seriesFunction}({string.Join(", ", parameters)}{(parameters.Length > 0 ? ", " : "")}{valueGroup.Target})",
RootTarget = valueGroup.RootTarget ?? valueGroup.Target,
SourceTarget = sourceTarget,
Source = ExecuteSeriesFunctionOverSource(valueGroup.Source, seriesFunction, parameters),
DropEmptySeries = dropEmptySeries
});
}
break;
}
}
}
}
private static int ParseCount(string parameter, DataSourceValue[] values, bool isSliceOperation)
{
int length = values.Length;
int count;
if (length == 0)
{
return(0);
}
parameter = parameter.Trim();
Tuple <bool, int> cache = TargetCache <Tuple <bool, int> > .GetOrAdd(parameter, () =>
{
bool success = true;
int result;
if (parameter.EndsWith("%"))
{
try
{
double percent = ParsePercentage(parameter, false);
result = (int)(length * (percent / 100.0D));
if (result == 0)
{
result = 1;
}
}
catch
{
success = false;
result = 0;
}
}
else
{
success = int.TryParse(parameter, out result);
}
return(new Tuple <bool, int>(success, result));
});
if (cache.Item1)
{
count = cache.Item2;
}
else
{
if (parameter.EndsWith("%"))
{
throw new ArgumentOutOfRangeException($"Could not parse '{parameter}' as a floating-point value or percentage is outside range of greater than 0 and less than or equal to 100.");
}
double defaultValue = 1.0D;
bool hasDefaultValue = false;
if (parameter.IndexOf(';') > -1)
{
string[] parts = parameter.Split(';');
if (parts.Length >= 2)
{
parameter = parts[0].Trim();
defaultValue = ParseCount(parts[1], values, isSliceOperation);
hasDefaultValue = true;
}
}
DataSourceValue result = values.FirstOrDefault(dataValue => dataValue.Target.Equals(parameter, StringComparison.OrdinalIgnoreCase));
if (string.IsNullOrEmpty(result.Target))
{
// Slice operations may not have a target for a given slice - in this case function should use a default value and not fail
if (isSliceOperation || hasDefaultValue)
{
result.Value = defaultValue;
}
else
{
throw new FormatException($"Value target '{parameter}' could not be found in dataset nor parsed as an integer value.");
}
}
// Treat fractional numbers as a percentage of length
if (result.Value > 0.0D && result.Value < 1.0D)
{
count = (int)(length * result.Value);
}
else
{
count = (int)result.Value;
}
}
if (count < 1)
{
throw new ArgumentOutOfRangeException($"Count '{count}' is less than one.");
}
return(count);
}
// Design philosophy: whenever possible this function should delay source enumeration since source data sets could be very large.
private static IEnumerable <DataSourceValue> ExecuteSeriesFunctionOverSource(IEnumerable <DataSourceValue> source, SeriesFunction seriesFunction, string[] parameters, bool isSliceOperation = false)
{
DataSourceValue[] values;
DataSourceValue result = new DataSourceValue();
double lastValue = double.NaN;
double lastTime = 0.0D;
string lastTarget = null;
IEnumerable <double> trackedValues = source.Select(dataValue =>
{
lastTime = dataValue.Time;
lastTarget = dataValue.Target;
return(dataValue.Value);
});
double baseTime, timeStep, value, low, high;
bool normalizeTime, lowInclusive, highInclusive;
int count;
TargetTimeUnit timeUnit;
AngleUnit angleUnit;
switch (seriesFunction)
{
case SeriesFunction.Minimum:
DataSourceValue minValue = new DataSourceValue {
Value = double.MaxValue
};
foreach (DataSourceValue dataValue in source)
{
if (dataValue.Value <= minValue.Value)
{
minValue = dataValue;
}
}
if (minValue.Time > 0.0D)
{
yield return(minValue);
}
break;
case SeriesFunction.Maximum:
DataSourceValue maxValue = new DataSourceValue {
Value = double.MinValue
};
foreach (DataSourceValue dataValue in source)
{
if (dataValue.Value >= maxValue.Value)
{
maxValue = dataValue;
}
}
if (maxValue.Time > 0.0D)
{
yield return(maxValue);
}
break;
case SeriesFunction.Average:
result.Value = trackedValues.Average();
result.Time = lastTime;
result.Target = lastTarget;
yield return(result);
break;
case SeriesFunction.Total:
result.Value = trackedValues.Sum();
result.Time = lastTime;
result.Target = lastTarget;
yield return(result);
break;
case SeriesFunction.Range:
DataSourceValue rangeMin = new DataSourceValue {
Value = double.MaxValue
};
DataSourceValue rangeMax = new DataSourceValue {
Value = double.MinValue
};
foreach (DataSourceValue dataValue in source)
{
if (dataValue.Value <= rangeMin.Value)
{
rangeMin = dataValue;
}
if (dataValue.Value >= rangeMax.Value)
{
rangeMax = dataValue;
}
}
if (rangeMin.Time > 0.0D && rangeMax.Time > 0.0D)
{
result = rangeMax;
result.Value = rangeMax.Value - rangeMin.Value;
yield return(result);
}
break;
case SeriesFunction.Count:
result.Value = trackedValues.Count();
result.Time = lastTime;
result.Target = lastTarget;
yield return(result);
break;
case SeriesFunction.Distinct:
foreach (DataSourceValue dataValue in source.DistinctBy(dataValue => dataValue.Value))
{
yield return(dataValue);
}
break;
case SeriesFunction.AbsoluteValue:
foreach (DataSourceValue dataValue in source.Select(dataValue => new DataSourceValue {
Value = Math.Abs(dataValue.Value), Time = dataValue.Time, Target = dataValue.Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.Add:
value = ParseFloat(parameters[0], source, false, isSliceOperation);
foreach (DataSourceValue dataValue in source.Select(dataValue => new DataSourceValue {
Value = dataValue.Value + value, Time = dataValue.Time, Target = dataValue.Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.Subtract:
value = ParseFloat(parameters[0], source, false, isSliceOperation);
foreach (DataSourceValue dataValue in source.Select(dataValue => new DataSourceValue {
Value = dataValue.Value - value, Time = dataValue.Time, Target = dataValue.Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.Multiply:
value = ParseFloat(parameters[0], source, false, isSliceOperation);
foreach (DataSourceValue dataValue in source.Select(dataValue => new DataSourceValue {
Value = dataValue.Value * value, Time = dataValue.Time, Target = dataValue.Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.Divide:
value = ParseFloat(parameters[0], source, false, isSliceOperation);
foreach (DataSourceValue dataValue in source.Select(dataValue => new DataSourceValue {
Value = dataValue.Value / value, Time = dataValue.Time, Target = dataValue.Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.Round:
count = parameters.Length == 0 ? 0 : ParseInt(parameters[0]);
foreach (DataSourceValue dataValue in source.Select(dataValue => new DataSourceValue {
Value = Math.Round(dataValue.Value, count), Time = dataValue.Time, Target = dataValue.Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.Floor:
foreach (DataSourceValue dataValue in source.Select(dataValue => new DataSourceValue {
Value = Math.Floor(dataValue.Value), Time = dataValue.Time, Target = dataValue.Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.Ceiling:
foreach (DataSourceValue dataValue in source.Select(dataValue => new DataSourceValue {
Value = Math.Ceiling(dataValue.Value), Time = dataValue.Time, Target = dataValue.Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.Truncate:
foreach (DataSourceValue dataValue in source.Select(dataValue => new DataSourceValue {
Value = Math.Truncate(dataValue.Value), Time = dataValue.Time, Target = dataValue.Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.StandardDeviation:
result.Value = trackedValues.StandardDeviation(parameters.Length > 0 && parameters[0].Trim().ParseBoolean());
result.Time = lastTime;
result.Target = lastTarget;
yield return(result);
break;
case SeriesFunction.Median:
values = source.Median();
if (values.Length == 0) //-V3080
{
yield break;
}
result = values.Last();
if (values.Length > 1)
{
result.Value = values.Select(dataValue => dataValue.Value).Average();
}
yield return(result);
break;
case SeriesFunction.Mode:
values = source.ToArray();
yield return(values.MajorityBy(values.Last(), dataValue => dataValue.Value, false));
break;
case SeriesFunction.Top:
values = source.ToArray();
if (values.Length == 0)
{
yield break;
}
count = ParseCount(parameters[0], values, isSliceOperation);
if (count > values.Length)
{
count = values.Length;
}
normalizeTime = parameters.Length == 1 || parameters[1].Trim().ParseBoolean();
baseTime = values[0].Time;
timeStep = (values[values.Length - 1].Time - baseTime) / (count - 1).NotZero(1);
Array.Sort(values, (a, b) => a.Value < b.Value ? -1 : (a.Value > b.Value ? 1 : 0));
foreach (DataSourceValue dataValue in values.Take(count).Select((dataValue, i) => new DataSourceValue {
Value = dataValue.Value, Time = normalizeTime ? baseTime + i * timeStep : dataValue.Time, Target = dataValue.Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.Bottom:
values = source.ToArray();
if (values.Length == 0)
{
yield break;
}
count = ParseCount(parameters[0], values, isSliceOperation);
if (count > values.Length)
{
count = values.Length;
}
normalizeTime = parameters.Length == 1 || parameters[1].Trim().ParseBoolean();
baseTime = values[0].Time;
timeStep = (values[values.Length - 1].Time - baseTime) / (count - 1).NotZero(1);
Array.Sort(values, (a, b) => a.Value > b.Value ? -1 : (a.Value < b.Value ? 1 : 0));
foreach (DataSourceValue dataValue in values.Take(count).Select((dataValue, i) => new DataSourceValue {
Value = dataValue.Value, Time = normalizeTime ? baseTime + i * timeStep : dataValue.Time, Target = dataValue.Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.Random:
values = source.ToArray();
if (values.Length == 0)
{
yield break;
}
count = ParseCount(parameters[0], values, isSliceOperation);
if (count > values.Length)
{
count = values.Length;
}
normalizeTime = parameters.Length == 1 || parameters[1].Trim().ParseBoolean();
baseTime = values[0].Time;
timeStep = (values[values.Length - 1].Time - baseTime) / (count - 1).NotZero(1);
List <int> indexes = new List <int>(Enumerable.Range(0, values.Length));
indexes.Scramble();
foreach (DataSourceValue dataValue in indexes.Take(count).Select((index, i) => new DataSourceValue {
Value = values[index].Value, Time = normalizeTime ? baseTime + i * timeStep : values[index].Time, Target = values[index].Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.First:
values = source.ToArray();
if (values.Length == 0)
{
yield break;
}
count = parameters.Length == 0 ? 1 : ParseCount(parameters[0], values, isSliceOperation);
if (count > values.Length)
{
count = values.Length;
}
for (int i = 0; i < count; i++)
{
yield return(values[i]);
}
break;
case SeriesFunction.Last:
values = source.ToArray();
if (values.Length == 0)
{
yield break;
}
count = parameters.Length == 0 ? 1 : ParseCount(parameters[0], values, isSliceOperation);
if (count > values.Length)
{
count = values.Length;
}
for (int i = 0; i < count; i++)
{
yield return(values[values.Length - 1 - i]);
}
break;
case SeriesFunction.Percentile:
double percent = ParsePercentage(parameters[0]);
values = source.ToArray();
if (values.Length == 0)
{
yield break;
}
Array.Sort(values, (a, b) => a.Value < b.Value ? -1 : (a.Value > b.Value ? 1 : 0));
count = values.Length;
if (percent == 0.0D)
{
yield return(values.First());
}
else if (percent == 100.0D)
{
yield return(values.Last());
}
else
{
double n = (count - 1) * (percent / 100.0D) + 1.0D;
int k = (int)n;
DataSourceValue kData = values[k];
double d = n - k;
double k0 = values[k - 1].Value;
double k1 = kData.Value;
result.Value = k0 + d * (k1 - k0);
result.Time = kData.Time;
result.Target = kData.Target;
yield return(result);
}
break;
case SeriesFunction.Difference:
foreach (DataSourceValue dataValue in source)
{
if (lastTime > 0.0D)
{
yield return new DataSourceValue {
Value = dataValue.Value - lastValue, Time = dataValue.Time, Target = lastTarget
}
}
;
lastValue = dataValue.Value;
lastTime = dataValue.Time;
lastTarget = dataValue.Target;
}
break;
case SeriesFunction.TimeDifference:
if (parameters.Length == 0 || !TargetTimeUnit.TryParse(parameters[0], out timeUnit))
{
timeUnit = new TargetTimeUnit {
Unit = TimeUnit.Seconds
}
}
;
foreach (DataSourceValue dataValue in source)
{
if (lastTime > 0.0D)
{
yield return new DataSourceValue {
Value = ToTimeUnits((dataValue.Time - lastTime) * SI.Milli, timeUnit), Time = dataValue.Time, Target = lastTarget
}
}
;
lastTime = dataValue.Time;
lastTarget = dataValue.Target;
}
break;
case SeriesFunction.Derivative:
if (parameters.Length == 0 || !TargetTimeUnit.TryParse(parameters[0], out timeUnit))
{
timeUnit = new TargetTimeUnit {
Unit = TimeUnit.Seconds
}
}
;
foreach (DataSourceValue dataValue in source)
{
if (lastTime > 0.0D)
{
yield return new DataSourceValue {
Value = (dataValue.Value - lastValue) / ToTimeUnits((dataValue.Time - lastTime) * SI.Milli, timeUnit), Time = dataValue.Time, Target = lastTarget
}
}
;
lastValue = dataValue.Value;
lastTime = dataValue.Time;
lastTarget = dataValue.Target;
}
break;
case SeriesFunction.TimeIntegration:
if (parameters.Length == 0 || !TargetTimeUnit.TryParse(parameters[0], out timeUnit))
{
timeUnit = new TargetTimeUnit {
Unit = TimeUnit.Hours
}
}
;
result.Value = 0.0D;
foreach (DataSourceValue dataValue in source)
{
if (lastTime > 0.0D)
{
result.Value += dataValue.Value * ToTimeUnits((dataValue.Time - lastTime) * SI.Milli, timeUnit);
}
lastTime = dataValue.Time;
lastTarget = dataValue.Target;
}
if (lastTime > 0.0D)
{
result.Time = lastTime;
result.Target = lastTarget;
yield return(result);
}
break;
case SeriesFunction.Interval:
if (parameters.Length == 1 || !TargetTimeUnit.TryParse(parameters[1], out timeUnit))
{
timeUnit = new TargetTimeUnit {
Unit = TimeUnit.Seconds
}
}
;
value = FromTimeUnits(ParseFloat(parameters[0], source, true, isSliceOperation), timeUnit) / SI.Milli;
foreach (DataSourceValue dataValue in source)
{
if (lastTime > 0.0D)
{
if (dataValue.Time - lastTime > value)
{
lastTime = dataValue.Time;
yield return(dataValue);
}
}
else
{
lastTime = dataValue.Time;
yield return(dataValue);
}
}
break;
case SeriesFunction.IncludeRange:
low = ParseFloat(parameters[0], source, false, isSliceOperation);
high = ParseFloat(parameters[1], source, false, isSliceOperation);
lowInclusive = parameters.Length > 2 && parameters[2].Trim().ParseBoolean();
highInclusive = parameters.Length > 3 ? parameters[3].Trim().ParseBoolean() : lowInclusive;
foreach (DataSourceValue dataValue in source.Where(dataValue => (lowInclusive ? dataValue.Value >= low : dataValue.Value > low) && (highInclusive ? dataValue.Value <= high : dataValue.Value < high)))
{
yield return(dataValue);
}
break;
case SeriesFunction.ExcludeRange:
low = ParseFloat(parameters[0], source, false, isSliceOperation);
high = ParseFloat(parameters[1], source, false, isSliceOperation);
lowInclusive = parameters.Length > 2 && parameters[2].Trim().ParseBoolean();
highInclusive = parameters.Length > 3 ? parameters[3].Trim().ParseBoolean() : lowInclusive;
foreach (DataSourceValue dataValue in source.Where(dataValue => (lowInclusive ? dataValue.Value <= low : dataValue.Value < low) || (highInclusive ? dataValue.Value >= high : dataValue.Value > high)))
{
yield return(dataValue);
}
break;
case SeriesFunction.FilterNaN:
bool alsoFilterInifinity = parameters.Length == 0 || parameters[0].Trim().ParseBoolean();
foreach (DataSourceValue dataValue in source.Where(dataValue => !(double.IsNaN(dataValue.Value) || alsoFilterInifinity && double.IsInfinity(dataValue.Value)))) //-V3130
{
yield return(dataValue);
}
break;
case SeriesFunction.UnwrapAngle:
if (parameters.Length == 0 || !Enum.TryParse(parameters[0], true, out angleUnit))
{
angleUnit = AngleUnit.Degrees;
}
values = source.ToArray();
foreach (DataSourceValue dataValue in Angle.Unwrap(values.Select(dataValue => Angle.ConvertFrom(dataValue.Value, angleUnit))).Select((angle, index) => new DataSourceValue {
Value = angle.ConvertTo(angleUnit), Time = values[index].Time, Target = values[index].Target
}))
{
yield return(dataValue);
}
break;
case SeriesFunction.WrapAngle:
if (parameters.Length == 0 || !Enum.TryParse(parameters[0], true, out angleUnit))
{
angleUnit = AngleUnit.Degrees;
}
foreach (DataSourceValue dataValue in source.Select(dataValue => new DataSourceValue {
Value = Angle.ConvertFrom(dataValue.Value, angleUnit).ToRange(-Math.PI, false).ConvertTo(angleUnit), Time = dataValue.Time, Target = dataValue.Target
}))
{
yield return(dataValue);
}
break;
}
}
private static double ParseFloat(string parameter, IEnumerable <DataSourceValue> source = null, bool validateGTEZero = true, bool isSliceOperation = false)
{
double value;
parameter = parameter.Trim();
Tuple <bool, double> cache = TargetCache <Tuple <bool, double> > .GetOrAdd(parameter, () =>
{
bool success = double.TryParse(parameter, out double result);
return(new Tuple <bool, double>(success, result));
});
if (cache.Item1)
{
value = cache.Item2;
}
else
{
if (source == null)
{
throw new FormatException($"Could not parse '{parameter}' as a floating-point value.");
}
double defaultValue = 0.0D;
bool hasDefaultValue = false;
if (parameter.IndexOf(';') > -1)
{
string[] parts = parameter.Split(';');
if (parts.Length >= 2)
{
parameter = parts[0].Trim();
defaultValue = ParseFloat(parts[1], source, validateGTEZero, isSliceOperation);
hasDefaultValue = true;
}
}
DataSourceValue result = source.FirstOrDefault(dataValue => dataValue.Target.Equals(parameter, StringComparison.OrdinalIgnoreCase));
if (string.IsNullOrEmpty(result.Target))
{
// Slice operations may not have a target for a given slice - in this case function should use a default value and not fail
if (isSliceOperation || hasDefaultValue)
{
result.Value = defaultValue;
}
else
{
throw new FormatException($"Value target '{parameter}' could not be found in dataset nor parsed as a floating-point value.");
}
}
value = result.Value;
}
if (validateGTEZero)
{
if (value < 0.0D)
{
throw new ArgumentOutOfRangeException($"Value '{parameter}' is less than zero.");
}
}
return(value);
}