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' 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.Collections.Generic
Imports System.Collections.Immutable
Imports System.Collections.ObjectModel
Imports System.Threading
Imports Microsoft.CodeAnalysis.Text
Imports Microsoft.CodeAnalysis.VisualBasic.Symbols
Imports Microsoft.CodeAnalysis.VisualBasic.Syntax
Namespace Microsoft.CodeAnalysis.VisualBasic.Symbols
''' <summary>
''' Represents a range variable symbol.
''' </summary>
Friend MustInherit Class RangeVariableSymbol
Inherits Symbol
Implements IRangeVariableSymbol
Friend ReadOnly m_Binder As Binder
Private ReadOnly _type As TypeSymbol
Public MustOverride ReadOnly Property Syntax As VisualBasicSyntaxNode
Private Sub New(
binder As Binder,
type As TypeSymbol
)
m_Binder = binder
_type = type
End Sub
Public Overrides ReadOnly Property Kind As SymbolKind
Get
Return SymbolKind.RangeVariable
End Get
End Property
Public Overrides ReadOnly Property ContainingSymbol As Symbol
Get
Return m_Binder.ContainingMember
End Get
End Property
Public Overridable ReadOnly Property Type As TypeSymbol
Get
Return _type
End Get
End Property
Public MustOverride Overrides ReadOnly Property Name As String
Public MustOverride Overrides ReadOnly Property Locations As ImmutableArray(Of Location)
Public Overrides ReadOnly Property DeclaredAccessibility As Accessibility
Get
Return Accessibility.NotApplicable
End Get
End Property
Public Overrides ReadOnly Property IsShared As Boolean
Get
Return False
End Get
End Property
Public Overrides ReadOnly Property IsOverridable As Boolean
Get
Return False
End Get
End Property
Public Overrides ReadOnly Property IsMustOverride As Boolean
Get
Return False
End Get
End Property
Public Overrides ReadOnly Property IsNotOverridable As Boolean
Get
Return False
End Get
End Property
Public Overrides ReadOnly Property IsOverrides As Boolean
Get
Return False
End Get
End Property
Friend NotOverridable Overrides ReadOnly Property ObsoleteAttributeData As ObsoleteAttributeData
Get
Return Nothing
End Get
End Property
Friend Overrides Function Accept(Of TArgument, TResult)(visitor As VisualBasicSymbolVisitor(Of TArgument, TResult), arg As TArgument) As TResult
Return visitor.VisitRangeVariable(Me, arg)
End Function
#Region "ISymbol"
Public Overrides Sub Accept(visitor As SymbolVisitor)
visitor.VisitRangeVariable(DirectCast(Me, IRangeVariableSymbol))
End Sub
Public Overrides Function Accept(Of TResult)(visitor As SymbolVisitor(Of TResult)) As TResult
Return visitor.VisitRangeVariable(DirectCast(Me, IRangeVariableSymbol))
End Function
Public Overrides Function Accept(Of TArgument, TResult)(visitor As SymbolVisitor(Of TArgument, TResult), argument As TArgument) As TResult
Return visitor.VisitRangeVariable(Me, argument)
End Function
Public Overrides Sub Accept(visitor As VisualBasicSymbolVisitor)
visitor.VisitRangeVariable(Me)
End Sub
Public Overrides Function Accept(Of TResult)(visitor As VisualBasicSymbolVisitor(Of TResult)) As TResult
Return visitor.VisitRangeVariable(Me)
End Function
#End Region
''' <summary>
''' Create a range variable symbol associated with an identifier token.
''' </summary>
Friend Shared Function Create(
binder As Binder,
declaringIdentifier As SyntaxToken,
type As TypeSymbol
) As RangeVariableSymbol
Return New WithIdentifierToken(binder, declaringIdentifier, type)
End Function
''' <summary>
''' Create a range variable symbol not associated with an identifier token, i.e. with illegal name.
''' Used for error recovery binding.
''' </summary>
Friend Shared Function CreateForErrorRecovery(
binder As Binder,
syntax As VisualBasicSyntaxNode,
type As TypeSymbol
) As RangeVariableSymbol
Return New ForErrorRecovery(binder, syntax, type)
End Function
Friend Shared Function CreateCompilerGenerated(
binder As Binder,
syntax As VisualBasicSyntaxNode,
name As String,
type As TypeSymbol
) As RangeVariableSymbol
Return New CompilerGenerated(binder, syntax, name, type)
End Function
Private Class WithIdentifierToken
Inherits RangeVariableSymbol
Private ReadOnly _identifierToken As SyntaxToken
Public Sub New(
binder As Binder,
declaringIdentifier As SyntaxToken,
type As TypeSymbol
)
MyBase.New(binder, type)
_identifierToken = declaringIdentifier
End Sub
Public Overrides ReadOnly Property Name As String
Get
Return _identifierToken.GetIdentifierText()
End Get
End Property
Public Overrides ReadOnly Property Syntax As VisualBasicSyntaxNode
Get
Return DirectCast(_identifierToken.Parent, VisualBasicSyntaxNode)
End Get
End Property
Public Overrides ReadOnly Property Locations As ImmutableArray(Of Location)
Get
Return ImmutableArray.Create(Of Location)(_identifierToken.GetLocation())
End Get
End Property
Public Overrides ReadOnly Property DeclaringSyntaxReferences As ImmutableArray(Of SyntaxReference)
Get
Dim parent As VisualBasicSyntaxNode
Dim grandParent As VisualBasicSyntaxNode = Nothing
Dim ggParent As VisualBasicSyntaxNode = Nothing
parent = DirectCast(_identifierToken.Parent, VisualBasicSyntaxNode)
If parent IsNot Nothing Then
grandParent = parent.Parent
End If
If grandParent IsNot Nothing Then
ggParent = grandParent.Parent
End If
Dim collectionRange = TryCast(grandParent, CollectionRangeVariableSyntax)
If collectionRange IsNot Nothing AndAlso _identifierToken = collectionRange.Identifier.Identifier Then
Return ImmutableArray.Create(Of SyntaxReference)(collectionRange.GetReference())
End If
Dim expressionRange = TryCast(ggParent, ExpressionRangeVariableSyntax)
If expressionRange IsNot Nothing AndAlso expressionRange.NameEquals IsNot Nothing AndAlso expressionRange.NameEquals.Identifier.Identifier = _identifierToken Then
Return ImmutableArray.Create(Of SyntaxReference)(expressionRange.GetReference())
End If
Dim aggregationRange = TryCast(ggParent, AggregationRangeVariableSyntax)
If aggregationRange IsNot Nothing AndAlso aggregationRange.NameEquals IsNot Nothing AndAlso aggregationRange.NameEquals.Identifier.Identifier = _identifierToken Then
Return ImmutableArray.Create(Of SyntaxReference)(aggregationRange.GetReference())
End If
Return ImmutableArray(Of SyntaxReference).Empty
End Get
End Property
Public Overrides Function Equals(obj As Object) As Boolean
'PERF: TryCast is to avoid going through GetObjectValue when calling ReferenceEquals
Dim other = TryCast(obj, RangeVariableSymbol.WithIdentifierToken)
If Me Is other Then
Return True
End If
Return other IsNot Nothing AndAlso other._identifierToken.Equals(_identifierToken)
End Function
Public Overrides Function GetHashCode() As Integer
Return _identifierToken.GetHashCode()
End Function
End Class
Private Class ForErrorRecovery
Inherits RangeVariableSymbol
Private ReadOnly _syntax As VisualBasicSyntaxNode
Public Sub New(
binder As Binder,
syntax As VisualBasicSyntaxNode,
type As TypeSymbol
)
MyBase.New(binder, type)
Debug.Assert(syntax IsNot Nothing)
_syntax = syntax
End Sub
Public Overrides ReadOnly Property Syntax As VisualBasicSyntaxNode
Get
Return _syntax
End Get
End Property
Public Overrides ReadOnly Property Name As String
Get
Return "$"c & _syntax.Position.ToString()
End Get
End Property
Public Overrides ReadOnly Property Locations As ImmutableArray(Of Location)
Get
Return ImmutableArray.Create(Of Location)(_syntax.GetLocation())
End Get
End Property
Public Overrides ReadOnly Property DeclaringSyntaxReferences As ImmutableArray(Of SyntaxReference)
Get
Return ImmutableArray(Of SyntaxReference).Empty
End Get
End Property
End Class
Private Class CompilerGenerated
Inherits ForErrorRecovery
Private ReadOnly _name As String
Public Sub New(
binder As Binder,
syntax As VisualBasicSyntaxNode,
name As String,
type As TypeSymbol
)
MyBase.New(binder, syntax, type)
Debug.Assert(name IsNot Nothing)
_name = name
End Sub
Public Overrides ReadOnly Property Name As String
Get
Return _name
End Get
End Property
End Class
End Class
End Namespace
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