102 lines
2.9 KiB
VB.net
102 lines
2.9 KiB
VB.net
#Region "Microsoft.VisualBasic::f55b44ccaca05d1edae7551d0b6e9456, Microsoft.VisualBasic.Core\Text\Parser\TryParse.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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' Enum TryParseOptions
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'
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' [Nothing], Empty, Source
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'
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'
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'
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'
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'
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' Delegate Function
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'
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'
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' Module ParserHelpers
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'
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' Function: TryParse
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'
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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 Text.Parser
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Public Enum TryParseOptions
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''' <summary>
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''' Function should returns empty string when try parse failed.
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''' </summary>
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Empty
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''' <summary>
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''' Function should returns nothing when try parse failed.
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''' </summary>
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[Nothing]
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''' <summary>
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''' Function should returns the source input when try parse failed.
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''' </summary>
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Source
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End Enum
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Public Delegate Function ITryParse(input As String, ByRef output As String) As Boolean
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''' <summary>
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''' Helpers for text parser
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''' </summary>
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Public Module ParserHelpers
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<Extension>
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Public Function TryParse(parser As ITryParse, input$, Optional opt As TryParseOptions = TryParseOptions.Empty) As String
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Dim out$ = Nothing
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If parser(input, out) Then
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Return out
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Else
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Select Case opt
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Case TryParseOptions.Empty
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Return ""
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Case TryParseOptions.Nothing
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Return Nothing
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Case TryParseOptions.Source
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Return input
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Case Else
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Return String.Empty
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End Select
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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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