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12208408
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2012-08-31T03:12:09.170
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2013-01-19T04:29:31.193
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2013-01-19T04:29:31.193
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518872
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2
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text
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<p>Here's one I created which appears to work... rather well. Not perfect, as it doesn't take into consideration many possible situations but it's a start.</p> <pre><code>Imports ICSharpCode.AvalonEdit.Folding Imports ICSharpCode.AvalonEdit.Document Public Class VBNETFoldingStrategy Inherits AbstractFoldingStrategy Private foldableKeywords() As String = {"namespace", "class", "sub", "function", "structure", "enum"} Public Overrides Function CreateNewFoldings(document As ICSharpCode.AvalonEdit.Document.TextDocument, ByRef firstErrorOffset As Integer) As System.Collections.Generic.IEnumerable(Of ICSharpCode.AvalonEdit.Folding.NewFolding) firstErrorOffset = -1 Dim foldings As New List(Of NewFolding) Dim text As String = document.Text Dim lowerCaseText As String = text.ToLower() For Each foldableKeyword In foldableKeywords foldings.AddRange(GetFoldings(text, lowerCaseText, foldableKeyword)) Next Return foldings.OrderBy(Function(f) f.StartOffset) End Function Public Function GetFoldings(text As String, lowerCaseText As String, keyword As String) As IEnumerable(Of NewFolding) Dim foldings As New List(Of NewFolding) Dim closingKeyword As String = "end " + keyword Dim closingKeywordLength As String = closingKeyword.Length keyword += " " Dim keywordLength As String = keyword.Length Dim startOffsets As New Stack(Of Integer) For i As Integer = 0 To text.Length - closingKeywordLength If lowerCaseText.Substring(i, keywordLength) = keyword Then Dim k As Integer = i If k <> 0 Then Dim lastLetterPos As Integer = i Do Until text(k - 1) = vbLf OrElse text(k - 1) = vbCr If Char.IsLetter(text(k)) Then lastLetterPos = k k -= 1 Loop If lastLetterPos > k Then k = lastLetterPos End If startOffsets.Push(k) ElseIf lowerCaseText.Substring(i, closingKeywordLength) = closingKeyword Then Dim startOffset As Integer = startOffsets.Pop() Dim newFolding As NewFolding = New NewFolding(startOffset, i + closingKeywordLength) Dim p As Integer = text.IndexOf(vbLf, startOffset) If p = -1 Then p = text.IndexOf(vbCr, startOffset) If p = -1 Then p = text.Length - 1 newFolding.Name = text.Substring(startOffset, p - startOffset) foldings.Add(newFolding) End If Next Return foldings End Function End Class </code></pre>
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1. POAvalonEdit Folding Strategy for VB
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