' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.

Imports System.Threading
Imports Microsoft.CodeAnalysis.PooledObjects
Imports Microsoft.CodeAnalysis.Structure
Imports Microsoft.CodeAnalysis.Text

Namespace Microsoft.CodeAnalysis.VisualBasic.Structure
    Friend Class DisabledTextTriviaStructureProvider
        Inherits AbstractSyntaxTriviaStructureProvider

        Public Overrides Sub CollectBlockSpans(trivia As SyntaxTrivia,
                                               spans As ArrayBuilder(Of BlockSpan),
                                               options As BlockStructureOptions,
                                               cancellationToken As CancellationToken)
            If trivia.Kind = SyntaxKind.DisabledTextTrivia Then
                ' Don't include trailing line breaks in spanToCollapse
                Dim nodeSpan = trivia.Span
                Dim startPos = nodeSpan.Start
                Dim endPos = startPos + trivia.ToString().TrimEnd().Length

                Dim span = TextSpan.FromBounds(startPos, endPos)
                spans.AddIfNotNull(CreateBlockSpan(
                    span:=span, hintSpan:=span,
                    bannerText:=Ellipsis, autoCollapse:=True,
                    type:=BlockTypes.PreprocessorRegion,
                    isCollapsible:=True, isDefaultCollapsed:=False))
            End If
        End Sub
    End Class
End Namespace