115 lines
3.7 KiB
VB.net
115 lines
3.7 KiB
VB.net
#Region "Microsoft.VisualBasic::2b6226b1eef6db682e0798b5b09dee22, Microsoft.VisualBasic.Core\Scripting\Expressions\ArrayIndex.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 ArrayIndex
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'
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' Function: AsVector, TranslateIndex
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'
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'
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' /********************************************************************************/
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#End Region
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Imports System.Runtime.CompilerServices
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Imports Microsoft.VisualBasic.Language
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Namespace Scripting.Expressions
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Public Module ArrayIndex
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''' <summary>
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''' 表达式字符串只允许：``1, 2, 3, 4, 5``
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''' </summary>
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''' <param name="exp$"></param>
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''' <returns></returns>
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<Extension> Public Function AsVector(exp$) As Double()
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Return exp.Split(","c) _
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.Select(AddressOf Trim) _
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.Select(Function(s) Val(s)) _
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.ToArray
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End Function
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''' <summary>
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''' Translate the vector expression into a intger index vector
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''' </summary>
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''' <param name="exp$">
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''' + ``1``, index=1
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''' + ``1:8``, index=1, count=8
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''' + ``1->8``, index from 1 to 8
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''' + ``8->1``, index from 8 to 1
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''' + ``1,2,3,4``, index=1 or 2 or 3 or 4
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''' </param>
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''' <returns></returns>
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<Extension> Public Function TranslateIndex(exp$) As Integer()
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If exp.IsPattern("-?\d+") Then
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Return {
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CInt(exp)
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}
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ElseIf exp.IndexOf(":"c) > -1 Then
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Dim t = exp.Split(":"c)
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Dim from = CInt(t(Scan0))
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Dim count = CInt(t(1))
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Dim indcies%() = New Integer(count - 1) {}
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For i As Integer = 0 To count - 1
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indcies(i) = i + from
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Next
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Return indcies
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ElseIf exp.IndexOf(","c) > -1 Then
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Dim t As Integer() = exp _
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.Split(","c) _
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.Select(Function(i) CInt(Val(i.Trim))) _
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.ToArray
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Return t
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ElseIf InStr(exp, "->") > 0 Then
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Dim t As Integer() = Strings.Split(exp, "->") _
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.Select(Function(s) CInt(s.Trim)) _
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.ToArray
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Dim from = t(Scan0)
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Dim to% = t(1)
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Dim delta = If(from < [to], 1, -1)
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Dim out As New List(Of Integer)
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For i As Integer = from To [to] Step delta
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out += i
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Next
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Return out
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Else
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Throw New SyntaxErrorException($"'{exp}' expression syntax error!")
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End If
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End Function
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End Module
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End Namespace
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