SearchExpressionEvaluatorAttribute

Definition

• Type: Class
• Namespace: UnityEditor.Search
• Assembly: UnityEditor
• Inherits from: Attribute

[AttributeUsage(AttributeTargets.Method)]public class SearchExpressionEvaluatorAttribute : Attribute

Examples

using System;using System.Collections.Generic;using System.ComponentModel;using System.Linq;using Unity.Collections.LowLevel.Unsafe;using UnityEditor;using UnityEditor.Search;using UnityEngine;public class SearchExpressionEvaluator_Example{    #region SearchExpressionTakeFirst    [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;                    }                }            }        }    }    #endregion    [MenuItem("Examples/ExpressionEvaluator/Take First")]    static void TestTakeFirst()    {        var ctx = SearchService.CreateContext("takexfirst{[1,2,3,4], [34, 45, 66], t:script}");        SearchService.ShowWindow(ctx);    }    [MenuItem("Examples/ExpressionEvaluator/Take 2 First")]    static void TestTake2First()    {        var ctx = SearchService.CreateContext("takexfirst{2, [1,2,3,4], [34, 45, 66], t:script}");        SearchService.ShowWindow(ctx);    }    #region SearchExpression_ThreadNotSupported1    [Description("Returns ids of current selection")]    [SearchExpressionEvaluator(SearchExpressionEvaluationHints.ThreadNotSupported)]    public static IEnumerable<SearchItem> SelectionIds(SearchExpressionContext c)    {        var entityIds = UnityEditor.Selection.entityIds;        foreach (var id in entityIds)        {            EntityId entityId = id;            yield return SearchExpression.CreateItem(UnsafeUtility.As<EntityId, ulong>(ref entityId), c.ResolveAlias("selected id"));        }    }    #endregion    [MenuItem("Examples/ExpressionEvaluator/Selection ids")]    static void SelectionIds()    {        var ctx = SearchService.CreateContext("selectionids{}");        SearchService.ShowWindow(ctx);    }    #region SearchExpression_ThreadNotSupported2    [Description("Returns asset paths corresponding to a list of instance ids")]    [SearchExpressionEvaluator("IdsToPaths", SearchExpressionEvaluationHints.ThreadNotSupported, SearchExpressionType.Iterable)]    public static IEnumerable<SearchItem> IdsToPath(SearchExpressionContext c)    {        foreach (var idItem in c.args[0].Execute(c))        {            if (SearchExpression.TryConvertToULong(idItem, out var idNum))            {                var id = UnsafeUtility.As<ulong, EntityId>(ref idNum);                var path = AssetDatabase.GetAssetPath(id);                if (!string.IsNullOrEmpty(path))                {                    yield return SearchExpression.CreateItem(path, c.ResolveAlias("asset path"));                }            }        }    }    #endregion    [MenuItem("Examples/ExpressionEvaluator/Selection ids to Paths")]    static void IdsToPaths()    {        var ctx = SearchService.CreateContext("IdsToPaths{selectionids{}}");        SearchService.ShowWindow(ctx);    }    #region SignatureOverload    [Description("Convert arguments to a string allowing you to format the result.")]    [SearchExpressionEvaluator(SearchExpressionType.Selector | SearchExpressionType.Text, SearchExpressionType.Iterable | SearchExpressionType.Literal | SearchExpressionType.Variadic)]    [SearchExpressionEvaluatorSignatureOverload(SearchExpressionType.Iterable | SearchExpressionType.Literal | SearchExpressionType.Variadic)]    public static IEnumerable<SearchItem> FormatItems(SearchExpressionContext c)    {        var skipCount = 0;        if (SearchExpression.GetFormatString(c.args[0], out var formatStr))            skipCount++;        var items = c.args.Skip(skipCount).SelectMany(e => e.Execute(c));        var dataSet = SearchExpression.ProcessValues(items, null, item => SearchExpression.FormatItem(c.search, item, formatStr));        return dataSet;    }    #endregion    [MenuItem("Examples/ExpressionEvaluator/Get Script Paths")]    static void GetScriptPaths()    {        var ctx = SearchService.CreateContext("formatitems{t:script search}");        SearchService.ShowWindow(ctx);    }}

Constructors

Inheritance