microsoft-visualbasic-runtime/Scripting/ExternalCall.vb

#Region "Microsoft.VisualBasic::1472354ab6a5d2b672d99b8df06c3298, Microsoft.VisualBasic.Core\Scripting\ExternalCall.vb"

    ' 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:

    '     Class ExternalCall
    ' 
    '         Constructor: (+1 Overloads) Sub New
    '         Function: buildArguments, Run, Shell, ToString
    ' 
    '     Structure ShellValue
    ' 
    '         Constructor: (+1 Overloads) Sub New
    '         Function: GetObject, ToString
    ' 
    ' 
    ' /********************************************************************************/

#End Region

Imports System.Collections.Specialized
Imports System.Runtime.CompilerServices
Imports Microsoft.VisualBasic.ApplicationServices
Imports Microsoft.VisualBasic.CommandLine
Imports Microsoft.VisualBasic.Serialization.JSON
Imports Microsoft.VisualBasic.Text

Namespace Scripting

    ''' <summary>
    ''' Shell object for the external script running.
    ''' </summary>
    Public Class ExternalCall

        ''' <summary>
        ''' 脚本宿主的可执行文件的路径
        ''' </summary>
        ReadOnly __host As String
        ReadOnly __ext As String

        ''' <summary>
        ''' 
        ''' </summary>
        ''' <param name="host">The program its file name to run the script</param>
        ''' <param name="ext">File extension name of this type of script</param>
        Sub New(host As String, Optional ext As String = ".txt")
            __host = FileIO.FileSystem.GetFileInfo(host).FullName
            __ext = ext
        End Sub

        ''' <summary>
        ''' 
        ''' </summary>
        ''' <param name="script">The script content</param>
        ''' <param name="args"></param>
        ''' <returns></returns>
        Public Function Run(script As String, Optional args As NameValueCollection = Nothing) As ShellValue
            Dim tmp As String = App.GetAppSysTempFile(__ext)
            Call script.SaveTo(tmp, Encodings.ASCII.CodePage)
            Return Shell(path:=tmp, args:=args)
        End Function

        ''' <summary>
        ''' 
        ''' </summary>
        ''' <param name="path">The script file path</param>
        ''' <param name="args"></param>
        ''' <returns></returns>
        ''' <remarks>Perl脚本测试通过！</remarks>
        Public Function Shell(path As String, Optional args As NameValueCollection = Nothing) As ShellValue
            Dim param As String = buildArguments(args)
            Dim IO As New IORedirect(__host, path & " " & param)
            Dim code As Integer = IO.Start(WaitForExit:=True)
            Return New ShellValue(IO, code)
        End Function

        Private Shared Function buildArguments(args As NameValueCollection) As String
            If args Is Nothing Then
                Return ""
            Else
                Return args _
                    .AllKeys _
                    .Select(Function(s)
                                Return $"{s} {args.Get(s).CLIToken}"
                            End Function) _
                    .JoinBy(" ")
            End If
        End Function

        Public Overrides Function ToString() As String
            Return __host
        End Function
    End Class

    ''' <summary>
    ''' Script shell result.
    ''' </summary>
    Public Structure ShellValue
        ''' <summary>
        ''' Standard output on the console
        ''' </summary>
        Public STD_OUT As String
        ''' <summary>
        ''' Standard error
        ''' </summary>
        Public STD_ERR As String
        ''' <summary>
        ''' Process exit code
        ''' </summary>
        Public state As Integer

        Sub New(io As IORedirect, exitCode As Integer)
            state = exitCode
            STD_OUT = io.StandardOutput
            STD_ERR = io.GetError
        End Sub

        ''' <summary>
        ''' Parsing object from the standard output
        ''' </summary>
        ''' <typeparam name="T"></typeparam>
        ''' <param name="parser">Object parser</param>
        ''' <returns></returns>
        ''' 
        <MethodImpl(MethodImplOptions.AggressiveInlining)>
        Public Function GetObject(Of T)(parser As Func(Of String, T)) As T
            Return parser(STD_OUT)
        End Function

        Public Overrides Function ToString() As String
            Return Me.GetJson
        End Function
    End Structure
End Namespace