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microsoft-visualbasic-runtime/Scripting/Actives.vb

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update file headers
2019-07-29 02:05:05 +08:00
#Region "Microsoft.VisualBasic::cf2d4a9335521ac19fb87b0859d735d6, Microsoft.VisualBasic.Core\Scripting\Actives.vb"
add source files
2018-08-02 20:14:48 +08:00
' Author:
'
' asuka (amethyst.asuka@gcmodeller.org)
' xie (genetics@smrucc.org)
' xieguigang (xie.guigang@live.com)
'
' Copyright (c) 2018 GPL3 Licensed
'
'
' GNU GENERAL PUBLIC LICENSE (GPL3)
'
'
' This program is free software: you can redistribute it and/or modify
' it under the terms of the GNU General Public License as published by
' the Free Software Foundation, either version 3 of the License, or
' (at your option) any later version.
'
' This program is distributed in the hope that it will be useful,
' but WITHOUT ANY WARRANTY; without even the implied warranty of
' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
' GNU General Public License for more details.
'
' You should have received a copy of the GNU General Public License
' along with this program. If not, see <http://www.gnu.org/licenses/>.
' /********************************************************************************/
' Summaries:
' Module Activity
'
' Function: __active, __activeArray, __activeDictionary, __activeList, Active
' ActiveObject, DisplayType
'
'
' /********************************************************************************/
#End Region
Imports System.Reflection
Imports System.Runtime.CompilerServices
Imports System.Text
Imports Microsoft.VisualBasic.CommandLine.Reflection
Imports Microsoft.VisualBasic.Serialization.JSON
Imports Microsoft.VisualBasic.Language
Imports v = System.Array
Namespace Scripting
''' <summary>
''' Display the object instance object json from the type definition by using <see cref="Activator"/>.
''' </summary>
Public Module Activity
''' <summary>
''' 请注意，所需要进行显示的类型必须要Public类型的，假若该目标类型在Module之中，请保证Module也是Public访问的
''' </summary>
''' <param name="type"></param>
''' <returns></returns>
<Extension> Public Function DisplayType(type As Type) As String
Dim sb As New StringBuilder
Dim view As ActiveViews = type.GetCustomAttribute(Of ActiveViews)
Dim fullName$ = type.FullName
If fullName.Split("."c).First = "System" Then
Call sb.AppendLine($"**Decalre**: _<a href=""https://msdn.microsoft.com/en-us/library/{fullName.ToLower}(v=vs.110).aspx?cs-save-lang=1&cs-lang=vb#code-snippet-1"">{fullName}</a>_")
Else
Call sb.AppendLine($"**Decalre**: _{fullName}_")
End If
Call sb.AppendLine()
Call sb.AppendLine("Example: ")
If view Is Nothing Then
Call sb.AppendLine("```json")
Call sb.AppendLine(Active(type))
Call sb.AppendLine("```")
Else
Call sb.AppendLine("```" & view.type)
Call sb.AppendLine(view.Views)
Call sb.AppendLine("```")
End If
Return sb.ToString
End Function
''' <summary>
''' Display the json of the target type its instance object.
''' </summary>
''' <param name="type"></param>
''' <returns></returns>
'''
<MethodImpl(MethodImplOptions.AggressiveInlining)>
Public Function Active(type As Type) As String
Return type.GetObjectJson(obj:=type.__active)
End Function
''' <summary>
''' 与<see cref="Activator.CreateInstance(Type)"/>所不同的是，这个函数还会对属性进行一些Demo值得赋值操作
''' </summary>
''' <param name="type"></param>
''' <returns></returns>
<Extension> Public Function ActiveObject(type As Type) As Object
Return type.__active
End Function
''' <summary>
''' Creates the example instance object for the example
''' </summary>
''' <param name="type"></param>
''' <returns></returns>
<Extension> Private Function __active(type As Type) As Object
If type.Equals(GetType(String)) Then
Return type.FullName
End If
If type.Equals(GetType(Char)) Then
Return "c"c
End If
If type.Equals(GetType(Date)) OrElse
type.Equals(GetType(DateTime)) Then
Return Now
End If
If __examples.ContainsKey(type) Then
Return __examples(type)
End If
If type.IsInheritsFrom(GetType(Array)) Then
Return type.__activeArray
ElseIf type.IsInheritsFrom(GetType(List(Of )), strict:=False) Then
Return type.__activeList
ElseIf type.IsInheritsFrom(GetType(Dictionary(Of ,)), strict:=False) Then
Return type.__activeDictionary
End If
Try
Dim obj As Object = Activator.CreateInstance(type)
Dim source As IEnumerable(Of PropertyInfo) =
type _
.GetProperties _
.Where(Function(x)
Return x.CanWrite AndAlso
x.GetIndexParameters _
.IsNullOrEmpty
End Function)
For Each prop As PropertyInfo In source
Dim value As Object = prop _
.PropertyType _
.__active
' 对于复杂的自定义类型，进行递归分解构造
Call prop.SetValue(obj, value)
Next
Return obj
Catch ex As Exception
ex = New Exception(type.FullName, ex)
Call App.LogException(ex)
Return Nothing
End Try
End Function
''' <summary>
''' + <see cref="System.Collections.Generic.List(Of T)"/>
''' + <see cref="Microsoft.VisualBasic.Language.List(Of T)"/>(会统一返回这种类型)
''' </summary>
''' <param name="type"></param>
''' <returns></returns>
<Extension>
Private Function __activeList(type As Type) As Object
Dim base As Type = type.GenericTypeArguments(Scan0)
Dim value As Object = base.__active
Dim list As Type = GetType(List(Of )).MakeGenericType(base)
Dim IList As IList = DirectCast(Activator.CreateInstance(list), IList)
Call IList.Add(value)
Return IList
End Function
<Extension>
Private Function __activeArray(type As Type) As Object
Dim base As Type = type.GetElementType
Dim value As Object = base.__active
Dim array As Array = v.CreateInstance(base, 1)
Call array.SetValue(value, Scan0)
Return array
End Function
<Extension>
Private Function __activeDictionary(type As Type) As Object
With type.GenericTypeArguments.AsList
Dim baseKey As Type = .Item(0)
Dim baseValue As Type = .Item(1)
Dim k As Object = baseKey.__active
Dim v As Object = baseValue.__active
Dim IDictionary As IDictionary = DirectCast(Activator.CreateInstance(type), IDictionary)
Call IDictionary.Add(k, v)
Return IDictionary
End With
End Function
ReadOnly __examples As IReadOnlyDictionary(Of Type, Object) =
New Dictionary(Of Type, Object) From {
_
{GetType(Double), 0R},
{GetType(Double?), 0R},
{GetType(Single), 0!},
{GetType(Single?), 0!},
{GetType(Integer), 0},
{GetType(Integer?), 0},
{GetType(Long), 0L},
{GetType(Long?), 0L},
{GetType(Short), 0S},
{GetType(Short?), 0S},
{GetType(Byte), 0},
{GetType(SByte), 0},
{GetType(Boolean), True},
{GetType(Decimal), 0@}
}
End Module
End Namespace