85 lines
2.9 KiB
VB.net
85 lines
2.9 KiB
VB.net
#Region "Microsoft.VisualBasic::b73cf94e64e0a1427dcb840d2830adc6, Microsoft.VisualBasic.Core\Language\Linq\Indexer.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Module Indexer
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'
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' Function: Indexing
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'
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'
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' /********************************************************************************/
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#End Region
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Imports Microsoft.VisualBasic.Emit.Delegates
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Imports Microsoft.VisualBasic.Linq
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Namespace Language
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Public Module Indexer
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#Region "Default Public Overloads Property Item(args As Object) As T()"
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''' <summary>
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''' Generates the vector elements index collection.
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''' </summary>
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''' <param name="args"></param>
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''' <returns></returns>
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Public Function Indexing(args As Object) As IEnumerable(Of Integer)
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Dim type As Type = args.GetType
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If type Is GetType(Integer) Then
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Return {DirectCast(args, Integer)}
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ElseIf type.ImplementInterface(GetType(IEnumerable(Of Integer))) Then
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Return DirectCast(args, IEnumerable(Of Integer))
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ElseIf type.ImplementInterface(GetType(IEnumerable(Of Boolean))) Then
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Return Which(DirectCast(args, IEnumerable(Of Boolean)))
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ElseIf type.ImplementInterface(GetType(IEnumerable(Of Object))) Then
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Dim array = DirectCast(args, IEnumerable(Of Object)).ToArray
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With array(Scan0).GetType
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If .ByRef Is GetType(Boolean) Then
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Return Which(array.Select(Function(o) CBool(o)))
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ElseIf .ByRef Is GetType(Integer) Then
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Return array.Select(Function(o) CInt(o))
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Else
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Throw New NotImplementedException
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End If
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End With
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Else
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Throw New NotImplementedException
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End If
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End Function
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#End Region
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End Module
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End Namespace
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