' Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.

Imports System.Collections.Immutable
Imports System.Threading
Imports Microsoft.CodeAnalysis.Structure
Imports Microsoft.CodeAnalysis.VisualBasic.Syntax

Namespace Microsoft.CodeAnalysis.VisualBasic.Structure
    Friend Class CompilationUnitStructureProvider
        Inherits AbstractSyntaxNodeStructureProvider(Of CompilationUnitSyntax)

        Protected Overrides Sub CollectBlockSpans(compilationUnit As CompilationUnitSyntax,
                                                  spans As ImmutableArray(Of BlockSpan).Builder,
                                                  cancellationToken As CancellationToken)
            Dim regions As New List(Of BlockSpan)

            CollectCommentsRegions(compilationUnit, spans)
            spans.Add(CreateRegion(
                compilationUnit.Imports, bannerText:="Imports" & SpaceEllipsis,
                autoCollapse:=True, type:=BlockTypes.Nonstructural, isCollapsible:=True))
            CollectCommentsRegions(compilationUnit.EndOfFileToken.LeadingTrivia, spans)
        End Sub

        Protected Overrides Function SupportedInWorkspaceKind(kind As String) As Boolean
            Return True
        End Function
    End Class
End Namespace