135 lines
4.6 KiB
VB.net
135 lines
4.6 KiB
VB.net
#Region "Microsoft.VisualBasic::d9963abdb1cd9050ffd80f3c10d220fc, Microsoft.VisualBasic.Core\Text\Paragraph.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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' Module Paragraph
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'
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' Function: Chunks, SplitParagraph, Trim
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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.ComponentModel.DataSourceModel
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Imports Microsoft.VisualBasic.Language
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Imports Microsoft.VisualBasic.Linq
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Namespace Text
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Public Module Paragraph
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''' <summary>
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''' 对于空文本，这个函数返回一个空集合
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''' </summary>
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''' <param name="text$"></param>
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''' <param name="lineBreak%"></param>
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''' <returns></returns>
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<Extension>
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Public Iterator Function Chunks(text$, lineBreak%) As IEnumerable(Of String)
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If Not text.StringEmpty Then
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For i As Integer = 1 To text.Length Step lineBreak
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Yield Mid(text, i, lineBreak)
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Next
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End If
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End Function
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''' <summary>
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'''
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''' </summary>
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''' <param name="text$"></param>
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''' <param name="len%"></param>
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''' <returns></returns>
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''' <remarks>
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''' 假若长度分割落在单词内，则添加一个连接符，假如是空格或者标点符号，则不处理
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''' </remarks>
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<Extension> Public Iterator Function SplitParagraph(text$, len%) As IEnumerable(Of String)
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Dim lines$() = text.LineTokens
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For Each i As SeqValue(Of String) In lines.SeqIterator
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Dim line$ = +i
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Dim s As New Value(Of String)
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Dim left% = Scan0 + 1
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Do While (s = Mid$(line$, left, len)).Length = len
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If s.Value.Length = 0 Then
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Exit Do ' 已经结束了
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Else
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left += len
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End If
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Dim nextLine$ = Mid(line, left, len) _
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.Replace(ASCII.TAB, " "c)
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Dim part As NamedValue(Of String) =
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nextLine.GetTagValue
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If String.IsNullOrEmpty(nextLine) Then
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Exit Do
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End If
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If Not String.IsNullOrEmpty(part.Name) Then ' 有空格
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s.Value = Trim((+s) & part.Name)
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left += part.Name.Length + 1
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ElseIf nextLine.First = " "c Then ' 第一个字符是空格，则忽略掉
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left += 1
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Else
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s.Value &= nextLine ' 是剩余的结束部分
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Yield Trim(+s)
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s.Value = Nothing ' 必须要value值删除字符串，否则会重复出现最后一行
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Exit Do
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End If
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Yield Trim(+s)
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Loop
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If Not String.IsNullOrEmpty(+s) Then
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Yield Trim(+s)
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Else
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If i.i <> lines.Length - 1 Then
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Yield vbCrLf
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End If
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End If
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Next
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Private Function Trim(s$) As String
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If s Is Nothing Then
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Return ""
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Else
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Return s.Trim(" ", ASCII.TAB)
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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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