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#Region "Microsoft.VisualBasic::f5419d3f4252bbbeed3dd101c5d483a3, Microsoft.VisualBasic.Core\CommandLine\Reflection\EntryPoints\Delegate.vb"
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#End Region
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Imports System.Reflection
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Imports System.Text
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Imports Microsoft.VisualBasic.CommandLine.ManView
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Imports Microsoft.VisualBasic.ComponentModel
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Imports Microsoft.VisualBasic.Text
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Namespace CommandLine.Reflection.EntryPoints
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Public Class APIDelegate : Implements IExportAPI
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Protected _NumberOfParameters As Integer
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Protected _metaData As Binding(Of ExportAPIAttribute, MethodInfo)
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Protected __funcInvoker As Func(Of Object(), Integer)
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Public ReadOnly Property Name() As String Implements IExportAPI.Name
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Get
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Return _metaData.Bind.Name
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End Get
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End Property
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Public ReadOnly Property Info() As String Implements IExportAPI.Info
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Get
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Return _metaData.Bind.Info
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End Get
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End Property
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Public ReadOnly Property Usage() As String Implements IExportAPI.Usage
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Get
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Return _metaData.Bind.Usage
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End Get
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End Property
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Public ReadOnly Property Example() As String Implements IExportAPI.Example
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Get
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Return _metaData.Bind.Example
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End Get
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End Property
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Public Sub New(attribute As Binding(Of ExportAPIAttribute, MethodInfo), [Invoke] As Func(Of Object(), Integer))
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_metaData = attribute
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__funcInvoker = Invoke
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_metaData = attribute
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_NumberOfParameters = 32
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End Sub
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Protected Sub New()
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End Sub
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Public Overridable Function HelpInformation(Optional md As Boolean = False) As String
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Dim sb As New StringBuilder(1024)
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If md Then
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sb.AppendLine($"{Name}</h3>")
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Else
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sb.AppendLine($"Help for command ""{Name}"":")
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End If
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Call sb.AppendLine()
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If md Then
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Dim prototype$ = APIPrototype(_metaData.Target.GetFullName)
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Call sb.AppendLine(Info)
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Call sb.AppendLine()
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Call sb.AppendLine($"**Prototype**: ``{prototype}``")
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Call sb.AppendLine()
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Call sb.AppendLine("###### Usage")
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Call sb.AppendLine()
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Call sb.AppendLine("```bash")
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Call sb.AppendLine($"{App.AssemblyName} {Usage}")
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Call sb.AppendLine("```")
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If Not String.IsNullOrEmpty(Example) Then
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Call sb.AppendLine("###### Example")
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Call sb.AppendLine("```bash")
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Call sb.AppendLine($"{App.AssemblyName} {Example}")
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Call sb.AppendLine("```")
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End If
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Else
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Dim infoLines$() = Paragraph.SplitParagraph(Info, 90).ToArray
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sb.AppendLine(String.Format(" Information: {0}", infoLines.FirstOrDefault))
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If infoLines.Length > 1 Then
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For Each line$ In infoLines.Skip(1)
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Call sb.AppendLine($" {line}")
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Next
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End If
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sb.AppendLine(String.Format(" Usage: {0} {1}", Application.ExecutablePath, Usage))
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sb.AppendLine(String.Format(" Example: {0} {1}", App.AssemblyName, Example))
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End If
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Return sb.ToString
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End Function
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<param name="parameters">数组的长度必须与目标函数的参数的数目一致,否则短于目标函数的参数的数目的数组会使用Nothing来填充缺少的部分,而多于目标函数的参数会被截断</param>
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Public Function Execute(parameters As Object()) As Integer
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Dim callParameters() As Object
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If parameters.Length < _NumberOfParameters Then
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callParameters = New Object(_NumberOfParameters - 1) {}
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Call parameters.CopyTo(callParameters, 0)
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ElseIf parameters.Length > _NumberOfParameters Then
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callParameters = New Object(_NumberOfParameters - 1) {}
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Call Array.ConstrainedCopy(parameters, 0, callParameters, 0, _NumberOfParameters)
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Else
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callParameters = parameters
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End If
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Return __funcInvoker.Invoke(callParameters)
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End Function
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Public Overrides Function ToString() As String
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Return Name
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End Function
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End Class
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End Namespace
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