114 lines
3.5 KiB
VB.net
114 lines
3.5 KiB
VB.net
#Region "Microsoft.VisualBasic::9f189648e6096fdf1ff2f336ffa3c895, Microsoft.VisualBasic.Core\Text\Parser\CharEnumerator.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 CharPtr
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'
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' Properties: Remaining
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'
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' Constructor: (+1 Overloads) Sub New
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' Function: PeekNext, PopNext, ToString
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' Operators: (+2 Overloads) Not
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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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Imports Microsoft.VisualBasic.Emit.Marshal
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Imports Microsoft.VisualBasic.Linq
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Imports Microsoft.VisualBasic.Language
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Namespace Text.Parser
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''' <summary>
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''' Char enumerator
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''' </summary>
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Public Class CharPtr : Inherits Pointer(Of Char)
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''' <summary>
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''' 查看还有多少字符没有被处理完
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''' </summary>
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''' <returns></returns>
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Public ReadOnly Property Remaining As String
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Get
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Return buffer.Skip(index).CharString
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End Get
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End Property
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Sub New(data As String)
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' 可能会存在空字符串
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Call MyBase.New(data.SafeQuery)
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End Sub
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Public Overloads Function PeekNext(length As Integer) As String
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Dim buf As New List(Of Char)
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For i As Integer = 0 To length - 1
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buf += Me(i)
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Next
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Return buf.CharString
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End Function
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Public Function PopNext(length As Integer) As String
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Dim result As String = PeekNext(length)
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index += length
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Return result
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End Function
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''' <summary>
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''' 这个调试试图函数会将当前的读取位置给标记出来
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''' </summary>
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''' <returns></returns>
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Public Overrides Function ToString() As String
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Dim previous$ = buffer.Take(index).CharString
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Dim current As Char = Me.Current
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Dim remaining$ = Me.Remaining
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Return $"{previous} ->[{current}]<- {remaining}"
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Shared Operator Not(chars As CharPtr) As Boolean
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Return Not chars.EndRead
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End Operator
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Overloads Shared Widening Operator CType(str As String) As CharPtr
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Return New CharPtr(str)
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End Operator
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End Class
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End Namespace
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