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Close| signatureArgumentTypes | Array of types corresponding to the type of the parameters used with this evaluator. |
| name | N ame of the evaluator. If no name are specified the name of the evaluator functio will be used. |
| hints | Hints to specify to the evaluator runtime how function should be run. |
Use this attribute to register a static C# function as a new evaluator. SearchExpressionEvaluator when use within a SearchExpression can have a signature that is validated against the passed parameters.
Here is an example using a Variadic paramater.
[SearchExpressionEvaluator(SearchExpressionType.Iterable | SearchExpressionType.Variadic)] [SearchExpressionEvaluatorSignatureOverload(SearchExpressionType.Number, SearchExpressionType.Iterable | SearchExpressionType.Variadic)] [Description("Extract and returns the X first results for each expression.")] public static IEnumerable<SearchItem> TakeXFirst(SearchExpressionContext c) { var argIndex = 0; var takeNumber = 1; if (c.args[0].types.HasFlag(SearchExpressionType.Number)) { ++argIndex; takeNumber = Math.Max((int)(c.args[0].GetNumberValue(takeNumber)), 0); } for ( ; argIndex < c.args.Length; ++argIndex) { var iterable = c.args[argIndex].Execute(c); var taken = 0; foreach (var item in iterable) { if (item == null) yield return null; else { yield return item; ++taken; if (taken == takeNumber) { c.Break(); break; } } } } }
Here is an example not supporting thread evaluation.
[Description("Returns ids of current selection")]
[SearchExpressionEvaluator(SearchExpressionEvaluationHints.ThreadNotSupported)]
public static IEnumerable<SearchItem> SelectionIds(SearchExpressionContext c)
{
var instanceIds = UnityEditor.Selection.instanceIDs;
foreach (var id in instanceIds)
{
yield return SearchExpression.CreateItem(id, c.ResolveAlias("selected id"));
}
}