1 | #Region "Microsoft.VisualBasic::71faaa05d0751672bc4431e6784d7976, Microsoft.VisualBasic.Core\Language\Linq\Indexer.vb" |
2 | |
3 | ' Author: |
4 | ' |
5 | ' asuka (amethyst.asuka@gcmodeller.org) |
6 | ' xie (genetics@smrucc.org) |
7 | ' xieguigang (xie.guigang@live.com) |
8 | ' |
9 | ' Copyright (c) 2018 GPL3 Licensed |
10 | ' |
11 | ' |
12 | ' GNU GENERAL PUBLIC LICENSE (GPL3) |
13 | ' |
14 | ' |
15 | ' This program is free software: you can redistribute it and/or modify |
16 | ' it under the terms of the GNU General Public License as published by |
17 | ' the Free Software Foundation, either version 3 of the License, or |
18 | ' (at your option) any later version. |
19 | ' |
20 | ' This program is distributed in the hope that it will be useful, |
21 | ' but WITHOUT ANY WARRANTY; without even the implied warranty of |
22 | ' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
23 | ' GNU General Public License for more details. |
24 | ' |
25 | ' You should have received a copy of the GNU General Public License |
26 | ' along with this program. If not, see <http://www.gnu.org/licenses/>. |
27 | |
28 | |
29 | |
30 | ' /********************************************************************************/ |
31 | |
32 | ' Summaries: |
33 | |
34 | ' Module Indexer |
35 | ' |
36 | ' Function: Indexing |
37 | ' |
38 | ' |
39 | ' /********************************************************************************/ |
40 | |
41 | #End Region |
42 | |
43 | Imports Microsoft.VisualBasic.Emit.Delegates |
44 | Imports Microsoft.VisualBasic.Linq |
45 | |
46 | Namespace Language |
47 | |
48 | Public Module Indexer |
49 | |
50 | #Region "Default Public Overloads Property Item(args As Object) As T()" |
51 | |
52 | ''' <summary> |
53 | ''' Generates the vector elements index collection. |
54 | ''' </summary> |
55 | ''' <param name="args"></param> |
56 | ''' <returns></returns> |
57 | Public Function Indexing(args As Object) As IEnumerable(Of Integer) |
58 | Dim type As Type = args.GetType |
59 | |
60 | If type Is GetType(Integer) Then |
61 | Return {DirectCast(args, Integer)} |
62 | ElseIf type.ImplementInterface(GetType(IEnumerable(Of Integer))) Then |
63 | Return DirectCast(args, IEnumerable(Of Integer)) |
64 | ElseIf type.ImplementInterface(GetType(IEnumerable(Of Boolean))) Then |
65 | Return Which.IsTrue(DirectCast(args, IEnumerable(Of Boolean))) |
66 | ElseIf type.ImplementInterface(GetType(IEnumerable(Of Object))) Then |
67 | Dim array = DirectCast(args, IEnumerable(Of Object)).ToArray |
68 | |
69 | With array(Scan0).GetType |
70 | If .ByRef Is GetType(Boolean) Then |
71 | Return Which.IsTrue(array.Select(Function(o) CBool(o))) |
72 | ElseIf .ByRef Is GetType(Integer) Then |
73 | Return array.Select(Function(o) CInt(o)) |
74 | Else |
75 | Throw New NotImplementedException |
76 | End If |
77 | End With |
78 | Else |
79 | Throw New NotImplementedException |
80 | End If |
81 | End Function |
82 | #End Region |
83 | End Module |
84 | End Namespace |