private static Result Cut(Evaluator.Args args)
{
var separator = args.ToString(args.GetSwitch("d") ?? " \t\r\n");
var fieldsValue = args.GetSwitch("f");
var fields = fieldsValue != null
? args.Preview(args.ToScalar(fieldsValue))
: "1";
var fieldIndices = new HashSet <int>(fields
.Split(',')
.SelectMany(f => int.TryParse(f, out var idx) ? new[] { idx - 1 } : new int[0]));
return(args
.Flatten()
.Select(obj => string
.Join(
separator,
args
.Preview(obj)
.Split(separator.ToCharArray(), StringSplitOptions.RemoveEmptyEntries)
.Where((_, idx) => fieldIndices.Contains(idx)))
.Trim())
.Where(s => s.Length > 0)
.ToArray());
}
private static Result Sum(Evaluator.Args args)
{
return(args
.Flatten()
.Select(obj => args.ToNumber(obj))
.Sum());
}
private static Result Avg(Evaluator.Args args)
{
return((long)args
.Flatten()
.Select(obj => args.ToNumber(obj))
.Average());
}
private static Result Tail(Evaluator.Args args)
{
var numElements = (int)args.GetNumSwitch("n", 10);
var flattened = args.Flatten().ToList();
return(flattened.Skip(flattened.Count - numElements).ToArray());
}
private static Result Join(Evaluator.Args args)
{
var separator = args.GetSwitch("d");
return(string.Join(
separator != null ? args.ToString(separator) : Environment.NewLine,
args.Flatten().Select(args.Preview)));
}
private static Result Sort(Evaluator.Args args)
{
var objs = args.Flatten();
var ordered = args.HasSwitch("n") // numeric sorting (otherwise string sorting)
? objs.OrderBy(args.ToInt)
: objs.OrderBy(args.Preview);
var finalOrder = args.HasSwitch("r") // reverse
? ordered.Reverse()
: ordered;
return(finalOrder.ToArray());
}
private static Result Uniq(Evaluator.Args args)
{
var groups = args.Flatten().GroupBy(obj => args.Preview(obj));
if (args.HasSwitch("c")) // count objects in each group
{
return(groups
.Select(grp => $"{grp.Count()}\t{args.Preview(grp.First())}")
.ToArray());
}
else
{
return(groups
.Select(grp => grp.First())
.ToArray());
}
}
private static Result Uniq(Evaluator.Args args)
{
var fieldToGroupBy = args.GetStrSwitch("k", null);
Func <object, object> keySelector = o => o;
if (!string.IsNullOrEmpty(fieldToGroupBy))
{
keySelector = o => args.Eval.Resolve(o).Properties.FirstOrDefault(p => p.Name == fieldToGroupBy)?.Value;
}
var aa = args.Flatten();
var groups = aa.GroupBy(obj => args.Preview(keySelector(obj)));
if (args.HasSwitch("c")) // count objects in each group
{
return(groups
.Select(grp =>
{
return new ObjectInfo(
preview: $"{grp.Count()}: {grp.Key}",
properties: new[]
{
new Property(name: "Key", value: grp.Key),
new Property(name: "Count", value: grp.Count()),
new Property(name: "Elems", value: grp.ToArray())
});
})
.ToArray());
}
else
{
return(groups
.Select(grp => grp.First())
.ToArray());
}
}
private static Result Sort(Evaluator.Args args)
{
var objs = args.Flatten();
var fieldToSortBy = args.GetStrSwitch("k", null);
Func <object, object> keySelector = o => o;
if (!string.IsNullOrEmpty(fieldToSortBy))
{
keySelector = o => args.Eval.Resolve(o).Properties.FirstOrDefault(p => p.Name == fieldToSortBy)?.Value;
}
IComparer <object> comparer = args.HasSwitch("n")
? Comparer <object> .Create((lhs, rhs) => Comparer <long?> .Default.Compare(args.Eval.TryToNumber(lhs), args.Eval.TryToNumber(rhs)))
: Comparer <object> .Create((lhs, rhs) => Comparer <string> .Default.Compare(args.Preview(lhs), args.Preview(rhs)));
var ordered = objs.OrderBy(keySelector, comparer);
var finalOrder = args.HasSwitch("r") // reverse
? ordered.Reverse()
: ordered;
return(finalOrder.ToArray());
}
private static Result Count(Evaluator.Args args)
{
return(args.Flatten().Count());
}
private static Result Head(Evaluator.Args args)
{
var numElements = (int)args.GetNumSwitch("n", 10);
return(args.Flatten().Take(numElements).ToArray());
}
private static Result StrCat(Evaluator.Args args, string defaultSeparator)
{
return(string.Join(
args.GetStrSwitch("d", defaultSeparator),
args.Flatten().Select(args.Preview)));
}