107 lines
3.6 KiB
VB.net
107 lines
3.6 KiB
VB.net
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#Region "Microsoft.VisualBasic::14a0f2801edc83c85c1320e092067316, Microsoft.VisualBasic.Core\Text\Xml\Linq\NodeIterator.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 NodeIterator
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'
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' Function: IterateArrayNodes
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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 System.Xml
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Imports Microsoft.VisualBasic.Language
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Namespace Text.Xml.Linq
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Public Module NodeIterator
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''' <summary>
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''' 使用<see cref="XmlDocument.Load"/>方法加载XML文档依旧是一次性的全部加载所有的文本到内存之中，第一次加载效率会比较低
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''' 则可以使用这个方法来加载非常大的XML文档
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''' </summary>
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''' <param name="path$"></param>
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''' <returns></returns>
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<Extension> Public Iterator Function IterateArrayNodes(path$, tag$) As IEnumerable(Of String)
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Dim buffer As New List(Of String)
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Dim start$ = "<" & tag
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Dim ends$ = $"</{tag}>"
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Dim stack%
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Dim tagOpen As Boolean = False
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Dim lefts$
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Dim i%
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For Each line As String In path.IterateAllLines
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If tagOpen Then
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i = InStr(line, ends)
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If i > 0 Then
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' 遇到了结束标签，则取出来
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If stack > 0 Then
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stack -= 1 ' 内部栈，还没有结束，则忽略当前的这个标签
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Else
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' 这个是真正的结束标签
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lefts = Mid(line, i + ends.Length)
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buffer += ends
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tagOpen = False
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Yield buffer.JoinBy(vbLf)
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buffer *= 0
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buffer += lefts
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' 这里要跳出来，否则后面buffer += line处任然会添加这个结束标签行的
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Continue For
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End If
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ElseIf InStr(line, start) > 0 Then
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stack += 1
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End If
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buffer += line
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Else
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' 需要一直遍历到开始标签为止
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i = InStr(line, start)
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If i > 0 Then
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tagOpen = True
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buffer += Mid(line, i)
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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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End Module
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End Namespace
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