125 lines
4.0 KiB
VB.net
125 lines
4.0 KiB
VB.net
#Region "Microsoft.VisualBasic::02a6b956c15a6bc900237956efeeadbb, Microsoft.VisualBasic.Core\My\JavaScript\UnionType.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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' Class UnionType
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'
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' Properties: IsLambda
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'
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' Function: [GetType], ToString
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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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Namespace My.JavaScript
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''' <summary>
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''' Union type of the value and its value generator function.
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''' </summary>
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''' <typeparam name="T"></typeparam>
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Public Class UnionType(Of T)
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Public value As T
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Public lambda As Func(Of T)
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Public lambda1 As Func(Of Object, T)
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Public lambda2 As Func(Of Object, Object, T)
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Public lambda3 As Func(Of Object, Object, Object, T)
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Default Public ReadOnly Property Eval(a As Object) As T
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Get
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Return lambda1(a)
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End Get
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End Property
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Default Public ReadOnly Property Eval(a As Object, b As Object) As T
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Get
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Return lambda2(a, b)
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End Get
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End Property
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Default Public ReadOnly Property Eval(a As Object, b As Object, c As Object) As T
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Get
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Return lambda3(a, b, c)
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End Get
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End Property
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Public ReadOnly Property IsLambda As Boolean
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Get
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With {
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lambda, lambda1, lambda2, lambda3
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}
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Return .Any(Function(f) Not f Is Nothing)
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End With
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End Get
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End Property
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Public Overloads Function [GetType]() As Type
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If IsLambda Then
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' 是一个函数
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Return GetType(Func(Of T))
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Else
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Return GetType(T)
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End If
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End Function
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Public Overrides Function ToString() As String
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If Me.GetType Is GetType(T) Then
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Return $"Dim <Anonymous> As {GetType(T).FullName} = {value.ToString}"
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Else
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Return $"<Anonymous> Function(...) As {GetType(T).FullName}"
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End If
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End Function
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Public Shared Narrowing Operator CType(uv As UnionType(Of T)) As T
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If uv.GetType Is GetType(T) Then
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Return uv.value
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ElseIf Not uv.lambda Is Nothing Then
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Return uv.lambda()
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Else
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Throw New InvalidCastException()
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End If
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End Operator
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Shared Widening Operator CType(val As T) As UnionType(Of T)
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Return New UnionType(Of T) With {.value = val}
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End Operator
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End Class
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End Namespace
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