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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.
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Text;
using System.Threading;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.LanguageService;
using Microsoft.CodeAnalysis.PooledObjects;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Utilities;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
using Microsoft.CodeAnalysis.CSharp.Shared.Extensions;
#if CODE_STYLE
using Microsoft.CodeAnalysis.Internal.Editing;
#else
using Microsoft.CodeAnalysis.Editing;
#endif
namespace Microsoft.CodeAnalysis.CSharp.LanguageService
{
internal class CSharpSyntaxFacts : ISyntaxFacts
{
internal static readonly CSharpSyntaxFacts Instance = new();
protected CSharpSyntaxFacts()
{
}
public bool IsCaseSensitive => true;
public StringComparer StringComparer { get; } = StringComparer.Ordinal;
public SyntaxTrivia ElasticMarker
=> SyntaxFactory.ElasticMarker;
public SyntaxTrivia ElasticCarriageReturnLineFeed
=> SyntaxFactory.ElasticCarriageReturnLineFeed;
public ISyntaxKinds SyntaxKinds { get; } = CSharpSyntaxKinds.Instance;
public bool SupportsIndexingInitializer(ParseOptions options)
=> options.LanguageVersion() >= LanguageVersion.CSharp6;
public bool SupportsThrowExpression(ParseOptions options)
=> options.LanguageVersion() >= LanguageVersion.CSharp7;
public bool SupportsLocalFunctionDeclaration(ParseOptions options)
=> options.LanguageVersion() >= LanguageVersion.CSharp7;
public bool SupportsRecord(ParseOptions options)
=> options.LanguageVersion() >= LanguageVersion.CSharp9;
public bool SupportsRecordStruct(ParseOptions options)
=> options.LanguageVersion() >= LanguageVersion.CSharp10;
public bool SupportsTargetTypedConditionalExpression(ParseOptions options)
=> options.LanguageVersion() >= LanguageVersion.CSharp9;
public bool SupportsConstantInterpolatedStrings(ParseOptions options)
=> options.LanguageVersion() >= LanguageVersion.CSharp10;
public bool SupportsTupleDeconstruction(ParseOptions options)
=> options.LanguageVersion() >= LanguageVersion.CSharp7;
public SyntaxToken ParseToken(string text)
=> SyntaxFactory.ParseToken(text);
public SyntaxTriviaList ParseLeadingTrivia(string text)
=> SyntaxFactory.ParseLeadingTrivia(text);
public string EscapeIdentifier(string identifier)
{
var nullIndex = identifier.IndexOf('\0');
if (nullIndex >= 0)
{
identifier = identifier[..nullIndex];
}
var needsEscaping = SyntaxFacts.GetKeywordKind(identifier) != SyntaxKind.None;
return needsEscaping ? "@" + identifier : identifier;
}
public bool IsVerbatimIdentifier(SyntaxToken token)
=> token.IsVerbatimIdentifier();
public bool IsOperator(SyntaxToken token)
{
var kind = token.Kind();
return
(SyntaxFacts.IsAnyUnaryExpression(kind) &&
(token.Parent is PrefixUnaryExpressionSyntax || token.Parent is PostfixUnaryExpressionSyntax || token.Parent is OperatorDeclarationSyntax)) ||
(SyntaxFacts.IsBinaryExpression(kind) && (token.Parent is BinaryExpressionSyntax or OperatorDeclarationSyntax or RelationalPatternSyntax)) ||
(SyntaxFacts.IsAssignmentExpressionOperatorToken(kind) && token.Parent is AssignmentExpressionSyntax);
}
public bool IsReservedKeyword(SyntaxToken token)
=> SyntaxFacts.IsReservedKeyword(token.Kind());
public bool IsContextualKeyword(SyntaxToken token)
=> SyntaxFacts.IsContextualKeyword(token.Kind());
public bool IsPreprocessorKeyword(SyntaxToken token)
=> SyntaxFacts.IsPreprocessorKeyword(token.Kind());
public bool IsPreProcessorDirectiveContext(SyntaxTree syntaxTree, int position, CancellationToken cancellationToken)
=> syntaxTree.IsPreProcessorDirectiveContext(
position, syntaxTree.FindTokenOnLeftOfPosition(position, cancellationToken, includeDirectives: true), cancellationToken);
public bool IsEntirelyWithinStringOrCharOrNumericLiteral([NotNullWhen(true)] SyntaxTree? syntaxTree, int position, CancellationToken cancellationToken)
{
if (syntaxTree == null)
{
return false;
}
return syntaxTree.IsEntirelyWithinStringOrCharLiteral(position, cancellationToken);
}
public bool IsDirective([NotNullWhen(true)] SyntaxNode? node)
=> node is DirectiveTriviaSyntax;
public bool TryGetExternalSourceInfo([NotNullWhen(true)] SyntaxNode? node, out ExternalSourceInfo info)
{
if (node is LineDirectiveTriviaSyntax lineDirective)
{
if (lineDirective.Line.Kind() == SyntaxKind.DefaultKeyword)
{
info = new ExternalSourceInfo(null, ends: true);
return true;
}
else if (lineDirective.Line.Kind() == SyntaxKind.NumericLiteralToken &&
lineDirective.Line.Value is int)
{
info = new ExternalSourceInfo((int)lineDirective.Line.Value, false);
return true;
}
}
info = default;
return false;
}
public bool IsNameOfSimpleMemberAccessExpression([NotNullWhen(true)] SyntaxNode? node)
{
var name = node as SimpleNameSyntax;
return name.IsSimpleMemberAccessExpressionName();
}
public bool IsNameOfAnyMemberAccessExpression([NotNullWhen(true)] SyntaxNode? node)
=> node?.Parent is MemberAccessExpressionSyntax memberAccess && memberAccess.Name == node;
public bool IsNameOfMemberBindingExpression([NotNullWhen(true)] SyntaxNode? node)
{
var name = node as SimpleNameSyntax;
return name.IsMemberBindingExpressionName();
}
[return: NotNullIfNotNull(nameof(node))]
public SyntaxNode? GetStandaloneExpression(SyntaxNode? node)
=> node is ExpressionSyntax expression ? SyntaxFactory.GetStandaloneExpression(expression) : node;
public SyntaxNode? GetRootConditionalAccessExpression(SyntaxNode? node)
=> node.GetRootConditionalAccessExpression();
public bool IsDeclarationExpression([NotNullWhen(true)] SyntaxNode? node)
=> node is DeclarationExpressionSyntax;
public bool IsAttributeName(SyntaxNode node)
=> SyntaxFacts.IsAttributeName(node);
public bool IsNamedArgument([NotNullWhen(true)] SyntaxNode? node)
=> node is ArgumentSyntax arg && arg.NameColon != null;
public bool IsNameOfNamedArgument([NotNullWhen(true)] SyntaxNode? node)
=> node.CheckParent<NameColonSyntax>(p => p.Name == node);
public SyntaxNode? GetParameterList(SyntaxNode node)
=> node.GetParameterList();
public bool IsParameterList([NotNullWhen(true)] SyntaxNode? node)
=> node is (kind: SyntaxKind.ParameterList or SyntaxKind.BracketedParameterList);
public bool IsUsingDirectiveName([NotNullWhen(true)] SyntaxNode? node)
=> node?.Parent is UsingDirectiveSyntax usingDirective &&
usingDirective.NamespaceOrType == node;
public bool IsUsingAliasDirective([NotNullWhen(true)] SyntaxNode? node)
=> node is UsingDirectiveSyntax usingDirectiveNode && usingDirectiveNode.Alias != null;
public void GetPartsOfUsingAliasDirective(SyntaxNode node, out SyntaxToken globalKeyword, out SyntaxToken alias, out SyntaxNode name)
{
var usingDirective = (UsingDirectiveSyntax)node;
globalKeyword = usingDirective.GlobalKeyword;
alias = usingDirective.Alias!.Name.Identifier;
name = usingDirective.NamespaceOrType;
}
public bool IsDeconstructionForEachStatement([NotNullWhen(true)] SyntaxNode? node)
=> node is ForEachVariableStatementSyntax;
public bool IsDeconstructionAssignment([NotNullWhen(true)] SyntaxNode? node)
=> node is AssignmentExpressionSyntax assignment && assignment.IsDeconstruction();
public Location GetDeconstructionReferenceLocation(SyntaxNode node)
{
return node switch
{
AssignmentExpressionSyntax assignment => assignment.Left.GetLocation(),
ForEachVariableStatementSyntax @foreach => @foreach.Variable.GetLocation(),
_ => throw ExceptionUtilities.UnexpectedValue(node.Kind()),
};
}
public bool IsStatement([NotNullWhen(true)] SyntaxNode? node)
=> node is StatementSyntax;
public bool IsExecutableStatement([NotNullWhen(true)] SyntaxNode? node)
=> node is StatementSyntax;
public bool IsGlobalStatement([NotNullWhen(true)] SyntaxNode? node)
=> node is GlobalStatementSyntax;
public SyntaxNode GetStatementOfGlobalStatement(SyntaxNode node)
=> ((GlobalStatementSyntax)node).Statement;
public bool AreStatementsInSameContainer(SyntaxNode firstStatement, SyntaxNode secondStatement)
{
Debug.Assert(IsStatement(firstStatement));
Debug.Assert(IsStatement(secondStatement));
if (firstStatement.Parent == secondStatement.Parent)
return true;
if (IsGlobalStatement(firstStatement.Parent)
&& IsGlobalStatement(secondStatement.Parent)
&& firstStatement.Parent.Parent == secondStatement.Parent.Parent)
{
return true;
}
return false;
}
public bool IsMethodBody([NotNullWhen(true)] SyntaxNode? node)
{
if (node is BlockSyntax or
ArrowExpressionClauseSyntax)
{
return node.Parent is BaseMethodDeclarationSyntax or
AccessorDeclarationSyntax;
}
return false;
}
public SyntaxNode GetExpressionOfRefExpression(SyntaxNode node)
=> ((RefExpressionSyntax)node).Expression;
public SyntaxNode? GetExpressionOfReturnStatement(SyntaxNode node)
=> ((ReturnStatementSyntax)node).Expression;
public bool IsThisConstructorInitializer(SyntaxToken token)
=> token.Parent is ConstructorInitializerSyntax(SyntaxKind.ThisConstructorInitializer) constructorInit &&
constructorInit.ThisOrBaseKeyword == token;
public bool IsBaseConstructorInitializer(SyntaxToken token)
=> token.Parent is ConstructorInitializerSyntax(SyntaxKind.BaseConstructorInitializer) constructorInit &&
constructorInit.ThisOrBaseKeyword == token;
public bool IsQueryKeyword(SyntaxToken token)
{
switch (token.Kind())
{
case SyntaxKind.FromKeyword:
case SyntaxKind.JoinKeyword:
case SyntaxKind.LetKeyword:
case SyntaxKind.OrderByKeyword:
case SyntaxKind.WhereKeyword:
case SyntaxKind.OnKeyword:
case SyntaxKind.EqualsKeyword:
case SyntaxKind.InKeyword:
return token.Parent is QueryClauseSyntax;
case SyntaxKind.ByKeyword:
case SyntaxKind.GroupKeyword:
case SyntaxKind.SelectKeyword:
return token.Parent is SelectOrGroupClauseSyntax;
case SyntaxKind.AscendingKeyword:
case SyntaxKind.DescendingKeyword:
return token.Parent is OrderingSyntax;
case SyntaxKind.IntoKeyword:
return token.Parent is (kind: SyntaxKind.JoinIntoClause or SyntaxKind.QueryContinuation);
default:
return false;
}
}
public bool IsPredefinedType(SyntaxToken token)
=> TryGetPredefinedType(token, out _);
public bool IsPredefinedType(SyntaxToken token, PredefinedType type)
=> TryGetPredefinedType(token, out var actualType) && actualType == type;
public bool IsPredefinedType(SyntaxNode? node)
=> node is PredefinedTypeSyntax predefinedType && IsPredefinedType(predefinedType.Keyword);
public bool IsPredefinedType(SyntaxNode? node, PredefinedType type)
=> node is PredefinedTypeSyntax predefinedType && IsPredefinedType(predefinedType.Keyword, type);
public bool TryGetPredefinedType(SyntaxToken token, out PredefinedType type)
{
type = GetPredefinedType(token);
return type != PredefinedType.None;
}
private static PredefinedType GetPredefinedType(SyntaxToken token)
=> token.Kind() switch
{
SyntaxKind.BoolKeyword => PredefinedType.Boolean,
SyntaxKind.ByteKeyword => PredefinedType.Byte,
SyntaxKind.SByteKeyword => PredefinedType.SByte,
SyntaxKind.IntKeyword => PredefinedType.Int32,
SyntaxKind.UIntKeyword => PredefinedType.UInt32,
SyntaxKind.ShortKeyword => PredefinedType.Int16,
SyntaxKind.UShortKeyword => PredefinedType.UInt16,
SyntaxKind.LongKeyword => PredefinedType.Int64,
SyntaxKind.ULongKeyword => PredefinedType.UInt64,
SyntaxKind.FloatKeyword => PredefinedType.Single,
SyntaxKind.DoubleKeyword => PredefinedType.Double,
SyntaxKind.DecimalKeyword => PredefinedType.Decimal,
SyntaxKind.StringKeyword => PredefinedType.String,
SyntaxKind.CharKeyword => PredefinedType.Char,
SyntaxKind.ObjectKeyword => PredefinedType.Object,
SyntaxKind.VoidKeyword => PredefinedType.Void,
SyntaxKind.IdentifierToken => token.Text switch
{
"nint" => PredefinedType.IntPtr,
"nuint" => PredefinedType.UIntPtr,
_ => PredefinedType.None,
},
_ => PredefinedType.None,
};
public bool IsPredefinedOperator(SyntaxToken token)
=> TryGetPredefinedOperator(token, out var actualOperator) && actualOperator != PredefinedOperator.None;
public bool IsPredefinedOperator(SyntaxToken token, PredefinedOperator op)
=> TryGetPredefinedOperator(token, out var actualOperator) && actualOperator == op;
public bool TryGetPredefinedOperator(SyntaxToken token, out PredefinedOperator op)
{
op = GetPredefinedOperator(token);
return op != PredefinedOperator.None;
}
private static PredefinedOperator GetPredefinedOperator(SyntaxToken token)
{
switch ((SyntaxKind)token.RawKind)
{
case SyntaxKind.PlusToken:
case SyntaxKind.PlusEqualsToken:
return PredefinedOperator.Addition;
case SyntaxKind.MinusToken:
case SyntaxKind.MinusEqualsToken:
return PredefinedOperator.Subtraction;
case SyntaxKind.AmpersandAmpersandToken: // overridden bitwise & can be accessed through &&
case SyntaxKind.AmpersandToken:
case SyntaxKind.AmpersandEqualsToken:
return PredefinedOperator.BitwiseAnd;
case SyntaxKind.BarBarToken: // overridden bitwise | can be accessed through ||
case SyntaxKind.BarToken:
case SyntaxKind.BarEqualsToken:
return PredefinedOperator.BitwiseOr;
case SyntaxKind.MinusMinusToken:
return PredefinedOperator.Decrement;
case SyntaxKind.PlusPlusToken:
return PredefinedOperator.Increment;
case SyntaxKind.SlashToken:
case SyntaxKind.SlashEqualsToken:
return PredefinedOperator.Division;
case SyntaxKind.EqualsEqualsToken:
return PredefinedOperator.Equality;
case SyntaxKind.CaretToken:
case SyntaxKind.CaretEqualsToken:
return PredefinedOperator.ExclusiveOr;
case SyntaxKind.GreaterThanToken:
return PredefinedOperator.GreaterThan;
case SyntaxKind.GreaterThanEqualsToken:
return PredefinedOperator.GreaterThanOrEqual;
case SyntaxKind.ExclamationEqualsToken:
return PredefinedOperator.Inequality;
case SyntaxKind.LessThanLessThanToken:
case SyntaxKind.LessThanLessThanEqualsToken:
return PredefinedOperator.LeftShift;
case SyntaxKind.LessThanToken:
return PredefinedOperator.LessThan;
case SyntaxKind.LessThanEqualsToken:
return PredefinedOperator.LessThanOrEqual;
case SyntaxKind.AsteriskToken:
case SyntaxKind.AsteriskEqualsToken:
return PredefinedOperator.Multiplication;
case SyntaxKind.PercentToken:
case SyntaxKind.PercentEqualsToken:
return PredefinedOperator.Modulus;
case SyntaxKind.ExclamationToken:
case SyntaxKind.TildeToken:
return PredefinedOperator.Complement;
case SyntaxKind.GreaterThanGreaterThanToken:
case SyntaxKind.GreaterThanGreaterThanEqualsToken:
return PredefinedOperator.RightShift;
case SyntaxKind.GreaterThanGreaterThanGreaterThanToken:
case SyntaxKind.GreaterThanGreaterThanGreaterThanEqualsToken:
return PredefinedOperator.UnsignedRightShift;
}
return PredefinedOperator.None;
}
public string GetText(int kind)
=> SyntaxFacts.GetText((SyntaxKind)kind);
public bool IsIdentifierStartCharacter(char c)
=> SyntaxFacts.IsIdentifierStartCharacter(c);
public bool IsIdentifierPartCharacter(char c)
=> SyntaxFacts.IsIdentifierPartCharacter(c);
public bool IsIdentifierEscapeCharacter(char c)
=> c == '@';
public bool IsValidIdentifier(string identifier)
{
var token = SyntaxFactory.ParseToken(identifier);
return this.IsIdentifier(token) && !token.ContainsDiagnostics && token.ToString().Length == identifier.Length;
}
public bool IsVerbatimIdentifier(string identifier)
{
var token = SyntaxFactory.ParseToken(identifier);
return this.IsIdentifier(token) && !token.ContainsDiagnostics && token.ToString().Length == identifier.Length && token.IsVerbatimIdentifier();
}
public bool IsTypeCharacter(char c) => false;
public bool IsStartOfUnicodeEscapeSequence(char c)
=> c == '\\';
public bool IsLiteral(SyntaxToken token)
{
switch (token.Kind())
{
case SyntaxKind.NumericLiteralToken:
case SyntaxKind.CharacterLiteralToken:
case SyntaxKind.StringLiteralToken:
case SyntaxKind.Utf8StringLiteralToken:
case SyntaxKind.SingleLineRawStringLiteralToken:
case SyntaxKind.Utf8SingleLineRawStringLiteralToken:
case SyntaxKind.MultiLineRawStringLiteralToken:
case SyntaxKind.Utf8MultiLineRawStringLiteralToken:
case SyntaxKind.NullKeyword:
case SyntaxKind.TrueKeyword:
case SyntaxKind.FalseKeyword:
case SyntaxKind.InterpolatedStringStartToken:
case SyntaxKind.InterpolatedStringEndToken:
case SyntaxKind.InterpolatedRawStringEndToken:
case SyntaxKind.InterpolatedVerbatimStringStartToken:
case SyntaxKind.InterpolatedStringTextToken:
case SyntaxKind.InterpolatedSingleLineRawStringStartToken:
case SyntaxKind.InterpolatedMultiLineRawStringStartToken:
return true;
default:
return false;
}
}
public bool IsStringLiteralOrInterpolatedStringLiteral(SyntaxToken token)
=> token.Kind() is SyntaxKind.StringLiteralToken or SyntaxKind.InterpolatedStringTextToken;
public bool IsBindableToken(SyntaxToken token)
{
if (this.IsWord(token) || this.IsLiteral(token) || this.IsOperator(token))
{
switch ((SyntaxKind)token.RawKind)
{
case SyntaxKind.DelegateKeyword:
case SyntaxKind.VoidKeyword:
return false;
}
return true;
}
// In the order by clause a comma might be bound to ThenBy or ThenByDescending
if (token.Kind() == SyntaxKind.CommaToken && token.Parent.IsKind(SyntaxKind.OrderByClause))
{
return true;
}
return false;
}
public bool IsPostfixUnaryExpression([NotNullWhen(true)] SyntaxNode? node)
=> node is PostfixUnaryExpressionSyntax;
public bool IsMemberBindingExpression([NotNullWhen(true)] SyntaxNode? node)
=> node is MemberBindingExpressionSyntax;
public bool IsPointerMemberAccessExpression([NotNullWhen(true)] SyntaxNode? node)
=> (node as MemberAccessExpressionSyntax)?.Kind() == SyntaxKind.PointerMemberAccessExpression;
public void GetNameAndArityOfSimpleName(SyntaxNode node, out string name, out int arity)
{
var simpleName = (SimpleNameSyntax)node;
name = simpleName.Identifier.ValueText;
arity = simpleName.Arity;
}
public bool LooksGeneric(SyntaxNode simpleName)
=> simpleName.IsKind(SyntaxKind.GenericName) ||
simpleName.GetLastToken().GetNextToken().Kind() == SyntaxKind.LessThanToken;
public SeparatedSyntaxList<SyntaxNode> GetTypeArgumentsOfGenericName(SyntaxNode? genericName)
=> (genericName as GenericNameSyntax)?.TypeArgumentList.Arguments ?? default;
public SyntaxNode? GetTargetOfMemberBinding(SyntaxNode? node)
=> (node as MemberBindingExpressionSyntax).GetParentConditionalAccessExpression()?.Expression;
public SyntaxNode GetNameOfMemberBindingExpression(SyntaxNode node)
=> ((MemberBindingExpressionSyntax)node).Name;
public SyntaxNode? GetExpressionOfMemberAccessExpression(SyntaxNode node, bool allowImplicitTarget)
=> ((MemberAccessExpressionSyntax)node).Expression;
public void GetPartsOfElementAccessExpression(SyntaxNode node, out SyntaxNode expression, out SyntaxNode argumentList)
{
var elementAccess = (ElementAccessExpressionSyntax)node;
expression = elementAccess.Expression;
argumentList = elementAccess.ArgumentList;
}
public SyntaxNode GetExpressionOfInterpolation(SyntaxNode node)
=> ((InterpolationSyntax)node).Expression;
public bool IsInStaticContext(SyntaxNode node)
=> node.IsInStaticContext();
public bool IsInNamespaceOrTypeContext([NotNullWhen(true)] SyntaxNode? node)
=> SyntaxFacts.IsInNamespaceOrTypeContext(node as ExpressionSyntax);
public bool IsBaseTypeList([NotNullWhen(true)] SyntaxNode? node)
=> node.IsKind(SyntaxKind.BaseList);
public SyntaxNode GetExpressionOfArgument(SyntaxNode node)
=> ((ArgumentSyntax)node).Expression;
public SyntaxNode GetExpressionOfAttributeArgument(SyntaxNode node)
=> ((AttributeArgumentSyntax)node).Expression;
public RefKind GetRefKindOfArgument(SyntaxNode node)
=> ((ArgumentSyntax)node).GetRefKind();
public bool IsArgument([NotNullWhen(true)] SyntaxNode? node)
=> node.IsKind(SyntaxKind.Argument);
public bool IsAttributeArgument([NotNullWhen(true)] SyntaxNode? node)
=> node.IsKind(SyntaxKind.AttributeArgument);
public bool IsSimpleArgument([NotNullWhen(true)] SyntaxNode? node)
{
return node is ArgumentSyntax argument &&
argument.RefOrOutKeyword.Kind() == SyntaxKind.None &&
argument.NameColon == null;
}
public bool IsInConstantContext([NotNullWhen(true)] SyntaxNode? node)
=> (node as ExpressionSyntax).IsInConstantContext();
public bool IsInConstructor(SyntaxNode node)
=> node.GetAncestor<ConstructorDeclarationSyntax>() != null;
public bool IsUnsafeContext(SyntaxNode node)
=> node.IsUnsafeContext();
public SyntaxNode GetNameOfAttribute(SyntaxNode node)
=> ((AttributeSyntax)node).Name;
public bool IsAttributeNamedArgumentIdentifier([NotNullWhen(true)] SyntaxNode? node)
=> (node as IdentifierNameSyntax).IsAttributeNamedArgumentIdentifier();
public SyntaxNode? GetContainingTypeDeclaration(SyntaxNode root, int position)
{
return root
.FindToken(position)
.GetAncestors<SyntaxNode>()
.FirstOrDefault(n => n is BaseTypeDeclarationSyntax or DelegateDeclarationSyntax);
}
public SyntaxNode? GetContainingVariableDeclaratorOfFieldDeclaration(SyntaxNode? node)
=> throw ExceptionUtilities.Unreachable();
public bool IsNameOfSubpattern([NotNullWhen(true)] SyntaxNode? node)
=> node.IsKind(SyntaxKind.IdentifierName) &&
node.IsParentKind(SyntaxKind.NameColon) &&
node.Parent.IsParentKind(SyntaxKind.Subpattern);
public bool IsPropertyPatternClause(SyntaxNode node)
=> node.Kind() == SyntaxKind.PropertyPatternClause;
public bool IsMemberInitializerNamedAssignmentIdentifier(
[NotNullWhen(true)] SyntaxNode? node, [NotNullWhen(true)] out SyntaxNode? initializedInstance)
{
initializedInstance = null;
if (node is IdentifierNameSyntax identifier &&
identifier.IsLeftSideOfAssignExpression())
{
if (identifier.Parent.IsParentKind(SyntaxKind.WithInitializerExpression))
{
var withInitializer = identifier.Parent.GetRequiredParent();
initializedInstance = withInitializer.GetRequiredParent();
return true;
}
else if (identifier.Parent.IsParentKind(SyntaxKind.ObjectInitializerExpression))
{
var objectInitializer = identifier.Parent.GetRequiredParent();
if (objectInitializer.Parent is BaseObjectCreationExpressionSyntax)
{
initializedInstance = objectInitializer.Parent;
return true;
}
else if (objectInitializer?.Parent is AssignmentExpressionSyntax(SyntaxKind.SimpleAssignmentExpression) assignment)
{
initializedInstance = assignment.Left;
return true;
}
}
}
return false;
}
public bool IsAnyInitializerExpression([NotNullWhen(true)] SyntaxNode? node, [NotNullWhen(true)] out SyntaxNode? creationExpression)
{
if (node is InitializerExpressionSyntax
{
Parent: BaseObjectCreationExpressionSyntax or ArrayCreationExpressionSyntax or ImplicitArrayCreationExpressionSyntax
})
{
creationExpression = node.Parent;
return true;
}
creationExpression = null;
return false;
}
public bool IsElementAccessExpression(SyntaxNode? node)
=> node.IsKind(SyntaxKind.ElementAccessExpression);
[return: NotNullIfNotNull(nameof(node))]
public SyntaxNode? ConvertToSingleLine(SyntaxNode? node, bool useElasticTrivia = false)
=> node.ConvertToSingleLine(useElasticTrivia);
public SyntaxNode? GetContainingMemberDeclaration(SyntaxNode root, int position, bool useFullSpan = true)
{
var end = root.FullSpan.End;
if (end == 0)
{
// empty file
return null;
}
// make sure position doesn't touch end of root
position = Math.Min(position, end - 1);
var node = root.FindToken(position).Parent;
while (node != null)
{
if (useFullSpan || node.Span.Contains(position))
{
var kind = node.Kind();
if ((kind != SyntaxKind.GlobalStatement) && (kind != SyntaxKind.IncompleteMember) && (node is MemberDeclarationSyntax))
{
return node;
}
}
node = node.Parent;
}
return null;
}
public bool IsMethodLevelMember([NotNullWhen(true)] SyntaxNode? node)
{
return node is BaseMethodDeclarationSyntax or
BasePropertyDeclarationSyntax or
EnumMemberDeclarationSyntax or
BaseFieldDeclarationSyntax;
}
public bool IsTopLevelNodeWithMembers([NotNullWhen(true)] SyntaxNode? node)
{
return node is BaseNamespaceDeclarationSyntax or
TypeDeclarationSyntax or
EnumDeclarationSyntax;
}
private const string dotToken = ".";
public string GetDisplayName(SyntaxNode? node, DisplayNameOptions options, string? rootNamespace = null)
{
if (node == null)
{
return string.Empty;
}
var pooled = PooledStringBuilder.GetInstance();
var builder = pooled.Builder;
// return type
var memberDeclaration = node as MemberDeclarationSyntax;
if ((options & DisplayNameOptions.IncludeType) != 0)
{
var type = memberDeclaration.GetMemberType();
if (type != null && !type.IsMissing)
{
builder.Append(type);
builder.Append(' ');
}
}
var names = ArrayBuilder<string?>.GetInstance();
// containing type(s)
var parent = node.GetAncestor<TypeDeclarationSyntax>() ?? node.Parent;
while (parent is TypeDeclarationSyntax)
{
names.Push(GetName(parent, options));
parent = parent.Parent;
}
// containing namespace(s) in source (if any)
if ((options & DisplayNameOptions.IncludeNamespaces) != 0)
{
while (parent is BaseNamespaceDeclarationSyntax)
{
names.Add(GetName(parent, options));
parent = parent.Parent;
}
}
while (!names.IsEmpty())
{
var name = names.Pop();
if (name != null)
{
builder.Append(name);
builder.Append(dotToken);
}
}
// name (including generic type parameters)
builder.Append(GetName(node, options));
// parameter list (if any)
if ((options & DisplayNameOptions.IncludeParameters) != 0)
{
builder.Append(memberDeclaration.GetParameterList());
}
return pooled.ToStringAndFree();
}
private static string? GetName(SyntaxNode node, DisplayNameOptions options)
{
const string missingTokenPlaceholder = "?";
switch (node.Kind())
{
case SyntaxKind.CompilationUnit:
return null;
case SyntaxKind.IdentifierName:
var identifier = ((IdentifierNameSyntax)node).Identifier;
return identifier.IsMissing ? missingTokenPlaceholder : identifier.Text;
case SyntaxKind.IncompleteMember:
return missingTokenPlaceholder;
case SyntaxKind.NamespaceDeclaration:
case SyntaxKind.FileScopedNamespaceDeclaration:
return GetName(((BaseNamespaceDeclarationSyntax)node).Name, options);
case SyntaxKind.QualifiedName:
var qualified = (QualifiedNameSyntax)node;
return GetName(qualified.Left, options) + dotToken + GetName(qualified.Right, options);
}
string? name = null;
if (node is MemberDeclarationSyntax memberDeclaration)
{
if (memberDeclaration.Kind() == SyntaxKind.ConversionOperatorDeclaration)
{
name = (memberDeclaration as ConversionOperatorDeclarationSyntax)?.Type.ToString();
}
else
{
var nameToken = memberDeclaration.GetNameToken();
if (nameToken != default)
{
name = nameToken.IsMissing ? missingTokenPlaceholder : nameToken.Text;
if (memberDeclaration.Kind() == SyntaxKind.DestructorDeclaration)
{
name = "~" + name;
}
if ((options & DisplayNameOptions.IncludeTypeParameters) != 0)
{
var pooled = PooledStringBuilder.GetInstance();
var builder = pooled.Builder;
builder.Append(name);
AppendTypeParameterList(builder, memberDeclaration.GetTypeParameterList());
name = pooled.ToStringAndFree();
}
}
else
{
Debug.Assert(memberDeclaration.Kind() == SyntaxKind.IncompleteMember);
name = "?";
}
}
}
else
{
if (node is VariableDeclaratorSyntax fieldDeclarator)
{
var nameToken = fieldDeclarator.Identifier;
if (nameToken != default)
{
name = nameToken.IsMissing ? missingTokenPlaceholder : nameToken.Text;
}
}
}
Debug.Assert(name != null, "Unexpected node type " + node.Kind());
return name;
}
private static void AppendTypeParameterList(StringBuilder builder, TypeParameterListSyntax typeParameterList)
{
if (typeParameterList != null && typeParameterList.Parameters.Count > 0)
{
builder.Append('<');
builder.Append(typeParameterList.Parameters[0].Identifier.ValueText);
for (var i = 1; i < typeParameterList.Parameters.Count; i++)
{
builder.Append(", ");
builder.Append(typeParameterList.Parameters[i].Identifier.ValueText);
}
builder.Append('>');
}
}
public List<SyntaxNode> GetTopLevelAndMethodLevelMembers(SyntaxNode? root)
{
var list = new List<SyntaxNode>();
AppendMembers(root, list, topLevel: true, methodLevel: true);
return list;
}
public List<SyntaxNode> GetMethodLevelMembers(SyntaxNode? root)
{
var list = new List<SyntaxNode>();
AppendMembers(root, list, topLevel: false, methodLevel: true);
return list;
}
public SyntaxList<SyntaxNode> GetMembersOfTypeDeclaration(SyntaxNode typeDeclaration)
=> ((TypeDeclarationSyntax)typeDeclaration).Members;
private void AppendMembers(SyntaxNode? node, List<SyntaxNode> list, bool topLevel, bool methodLevel)
{
Debug.Assert(topLevel || methodLevel);
foreach (var member in node.GetMembers())
{
if (IsTopLevelNodeWithMembers(member))
{
if (topLevel)
{
list.Add(member);
}
AppendMembers(member, list, topLevel, methodLevel);
continue;
}
if (methodLevel && IsMethodLevelMember(member))
{
list.Add(member);
}
}
}
public TextSpan GetMemberBodySpanForSpeculativeBinding(SyntaxNode node)
{
if (node.Span.IsEmpty)
{
return default;
}
var member = GetContainingMemberDeclaration(node, node.SpanStart);
if (member == null)
{
return default;
}
// TODO: currently we only support method for now
if (member is BaseMethodDeclarationSyntax method)
{
if (method.Body == null)
{
return default;
}
return GetBlockBodySpan(method.Body);
}
return default;
}
public bool ContainsInMemberBody([NotNullWhen(true)] SyntaxNode? node, TextSpan span)
{
switch (node)
{
case ConstructorDeclarationSyntax constructor:
return (constructor.Body != null && GetBlockBodySpan(constructor.Body).Contains(span)) ||
(constructor.Initializer != null && constructor.Initializer.Span.Contains(span));
case BaseMethodDeclarationSyntax method:
return method.Body != null && GetBlockBodySpan(method.Body).Contains(span);
case BasePropertyDeclarationSyntax property:
return property.AccessorList != null && property.AccessorList.Span.Contains(span);
case EnumMemberDeclarationSyntax @enum:
return @enum.EqualsValue != null && @enum.EqualsValue.Span.Contains(span);
case BaseFieldDeclarationSyntax field:
return field.Declaration != null && field.Declaration.Span.Contains(span);
}
return false;
}
private static TextSpan GetBlockBodySpan(BlockSyntax body)
=> TextSpan.FromBounds(body.OpenBraceToken.Span.End, body.CloseBraceToken.SpanStart);
public SyntaxNode? TryGetBindableParent(SyntaxToken token)
{
var node = token.Parent;
while (node != null)
{
var parent = node.Parent;
// If this node is on the left side of a member access expression, don't ascend
// further or we'll end up binding to something else.
if (parent is MemberAccessExpressionSyntax memberAccess)
{
if (memberAccess.Expression == node)
{
break;
}
}
// If this node is on the left side of a qualified name, don't ascend
// further or we'll end up binding to something else.
if (parent is QualifiedNameSyntax qualifiedName)
{
if (qualifiedName.Left == node)
{
break;
}
}
// If this node is on the left side of a alias-qualified name, don't ascend
// further or we'll end up binding to something else.
if (parent is AliasQualifiedNameSyntax aliasQualifiedName)
{
if (aliasQualifiedName.Alias == node)
{
break;
}
}
// If this node is the type of an object creation expression, return the
// object creation expression.
if (parent is ObjectCreationExpressionSyntax objectCreation)
{
if (objectCreation.Type == node)
{
node = parent;
break;
}
}
// The inside of an interpolated string is treated as its own token so we
// need to force navigation to the parent expression syntax.
if (node is InterpolatedStringTextSyntax && parent is InterpolatedStringExpressionSyntax)
{
node = parent;
break;
}
// If this node is not parented by a name, we're done.
if (parent is not NameSyntax)
{
break;
}
node = parent;
}
if (node is VarPatternSyntax)
{
return node;
}
// Patterns are never bindable (though their constituent types/exprs may be).
return node is PatternSyntax ? null : node;
}
public IEnumerable<SyntaxNode> GetConstructors(SyntaxNode? root, CancellationToken cancellationToken)
{
if (root is not CompilationUnitSyntax compilationUnit)
{
return SpecializedCollections.EmptyEnumerable<SyntaxNode>();
}
var constructors = new List<SyntaxNode>();
AppendConstructors(compilationUnit.Members, constructors, cancellationToken);
return constructors;
}
private void AppendConstructors(SyntaxList<MemberDeclarationSyntax> members, List<SyntaxNode> constructors, CancellationToken cancellationToken)
{
foreach (var member in members)
{
cancellationToken.ThrowIfCancellationRequested();
switch (member)
{
case ConstructorDeclarationSyntax constructor:
constructors.Add(constructor);
continue;
case BaseNamespaceDeclarationSyntax @namespace:
AppendConstructors(@namespace.Members, constructors, cancellationToken);
break;
case ClassDeclarationSyntax @class:
AppendConstructors(@class.Members, constructors, cancellationToken);
break;
case RecordDeclarationSyntax record:
AppendConstructors(record.Members, constructors, cancellationToken);
break;
case StructDeclarationSyntax @struct:
AppendConstructors(@struct.Members, constructors, cancellationToken);
break;
}
}
}
public TextSpan GetInactiveRegionSpanAroundPosition(SyntaxTree syntaxTree, int position, CancellationToken cancellationToken)
{
var trivia = syntaxTree.GetRoot(cancellationToken).FindTrivia(position, findInsideTrivia: false);
if (trivia.Kind() == SyntaxKind.DisabledTextTrivia)
{
return trivia.FullSpan;
}
var token = syntaxTree.FindTokenOrEndToken(position, cancellationToken);
if (token.Kind() == SyntaxKind.EndOfFileToken)
{
var triviaList = token.LeadingTrivia;
foreach (var triviaTok in triviaList.Reverse())
{
if (triviaTok.Span.Contains(position))
{
return default;
}
if (triviaTok.Span.End < position)
{
if (!triviaTok.HasStructure)
{
return default;
}
var structure = triviaTok.GetStructure();
if (structure is BranchingDirectiveTriviaSyntax branch)
{
return !branch.IsActive || !branch.BranchTaken ? TextSpan.FromBounds(branch.FullSpan.Start, position) : default;
}
}
}
}
return default;
}
public string GetNameForArgument(SyntaxNode? argument)
=> (argument as ArgumentSyntax)?.NameColon?.Name.Identifier.ValueText ?? string.Empty;
public string GetNameForAttributeArgument(SyntaxNode? argument)
=> (argument as AttributeArgumentSyntax)?.NameEquals?.Name.Identifier.ValueText ?? string.Empty;
public bool IsLeftSideOfDot([NotNullWhen(true)] SyntaxNode? node)
=> (node as ExpressionSyntax).IsLeftSideOfDot();
public SyntaxNode? GetRightSideOfDot(SyntaxNode? node)
{
return (node as QualifiedNameSyntax)?.Right ??
(node as MemberAccessExpressionSyntax)?.Name;
}
public SyntaxNode? GetLeftSideOfDot(SyntaxNode? node, bool allowImplicitTarget)
{
return (node as QualifiedNameSyntax)?.Left ??
(node as MemberAccessExpressionSyntax)?.Expression;
}
public bool IsLeftSideOfExplicitInterfaceSpecifier([NotNullWhen(true)] SyntaxNode? node)
=> (node as NameSyntax).IsLeftSideOfExplicitInterfaceSpecifier();
public bool IsLeftSideOfAssignment([NotNullWhen(true)] SyntaxNode? node)
=> (node as ExpressionSyntax).IsLeftSideOfAssignExpression();
public bool IsLeftSideOfAnyAssignment([NotNullWhen(true)] SyntaxNode? node)
=> (node as ExpressionSyntax).IsLeftSideOfAnyAssignExpression();
public bool IsLeftSideOfCompoundAssignment([NotNullWhen(true)] SyntaxNode? node)
=> (node as ExpressionSyntax).IsLeftSideOfCompoundAssignExpression();
public SyntaxNode GetRightHandSideOfAssignment(SyntaxNode node)
=> ((AssignmentExpressionSyntax)node).Right;
public bool IsInferredAnonymousObjectMemberDeclarator([NotNullWhen(true)] SyntaxNode? node)
=> node is AnonymousObjectMemberDeclaratorSyntax anonObject &&
anonObject.NameEquals == null;
public bool IsOperandOfIncrementExpression([NotNullWhen(true)] SyntaxNode? node)
=> node.IsParentKind(SyntaxKind.PostIncrementExpression) ||
node.IsParentKind(SyntaxKind.PreIncrementExpression);
public static bool IsOperandOfDecrementExpression([NotNullWhen(true)] SyntaxNode? node)
=> node.IsParentKind(SyntaxKind.PostDecrementExpression) ||
node.IsParentKind(SyntaxKind.PreDecrementExpression);
public bool IsOperandOfIncrementOrDecrementExpression([NotNullWhen(true)] SyntaxNode? node)
=> IsOperandOfIncrementExpression(node) || IsOperandOfDecrementExpression(node);
public SyntaxList<SyntaxNode> GetContentsOfInterpolatedString(SyntaxNode interpolatedString)
=> ((InterpolatedStringExpressionSyntax)interpolatedString).Contents;
public bool IsVerbatimStringLiteral(SyntaxToken token)
=> token.IsVerbatimStringLiteral();
public bool IsNumericLiteral(SyntaxToken token)
=> token.Kind() == SyntaxKind.NumericLiteralToken;
public SeparatedSyntaxList<SyntaxNode> GetArgumentsOfObjectCreationExpression(SyntaxNode objectCreationExpression)
=> ((BaseObjectCreationExpressionSyntax)objectCreationExpression).ArgumentList is { } argumentList
? GetArgumentsOfArgumentList(argumentList)
: default;
public SeparatedSyntaxList<SyntaxNode> GetArgumentsOfArgumentList(SyntaxNode argumentList)
=> ((BaseArgumentListSyntax)argumentList).Arguments;
public SeparatedSyntaxList<SyntaxNode> GetArgumentsOfAttributeArgumentList(SyntaxNode argumentList)
=> ((AttributeArgumentListSyntax)argumentList).Arguments;
public bool IsRegularComment(SyntaxTrivia trivia)
=> trivia.IsRegularComment();
public bool IsDocumentationComment(SyntaxTrivia trivia)
=> trivia.IsDocComment();
public bool IsElastic(SyntaxTrivia trivia)
=> trivia.IsElastic();
public bool IsPragmaDirective(SyntaxTrivia trivia, out bool isDisable, out bool isActive, out SeparatedSyntaxList<SyntaxNode> errorCodes)
=> trivia.IsPragmaDirective(out isDisable, out isActive, out errorCodes);
public bool IsDocumentationCommentExteriorTrivia(SyntaxTrivia trivia)
=> trivia.Kind() == SyntaxKind.DocumentationCommentExteriorTrivia;
public bool IsDocumentationComment(SyntaxNode node)
=> SyntaxFacts.IsDocumentationCommentTrivia(node.Kind());
public bool IsUsingOrExternOrImport([NotNullWhen(true)] SyntaxNode? node)
{
return node.IsKind(SyntaxKind.UsingDirective) ||
node.IsKind(SyntaxKind.ExternAliasDirective);
}
public bool IsGlobalAssemblyAttribute([NotNullWhen(true)] SyntaxNode? node)
=> IsGlobalAttribute(node, SyntaxKind.AssemblyKeyword);
public bool IsGlobalModuleAttribute([NotNullWhen(true)] SyntaxNode? node)
=> IsGlobalAttribute(node, SyntaxKind.ModuleKeyword);
private static bool IsGlobalAttribute([NotNullWhen(true)] SyntaxNode? node, SyntaxKind attributeTarget)
=> node.IsKind(SyntaxKind.Attribute) &&
node.Parent is AttributeListSyntax attributeList &&
attributeList.Target?.Identifier.Kind() == attributeTarget;
public bool IsDeclaration(SyntaxNode? node)
{
if (node is null)
return false;
if (SyntaxFacts.IsNamespaceMemberDeclaration(node.Kind()))
return true;
// From the C# language spec:
// class-member-declaration:
// constant-declaration
// field-declaration
// method-declaration
// property-declaration
// event-declaration
// indexer-declaration
// operator-declaration
// constructor-declaration
// destructor-declaration
// static-constructor-declaration
// type-declaration
switch (node.Kind())
{
// Because fields declarations can define multiple symbols "public int a, b;"
// We want to get the VariableDeclarator node inside the field declaration to print out the symbol for the name.
case SyntaxKind.VariableDeclarator:
return node.Parent.IsParentKind(SyntaxKind.FieldDeclaration) ||
node.Parent.IsParentKind(SyntaxKind.EventFieldDeclaration);
case SyntaxKind.FieldDeclaration:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.PropertyDeclaration:
case SyntaxKind.GetAccessorDeclaration:
case SyntaxKind.SetAccessorDeclaration:
case SyntaxKind.EventDeclaration:
case SyntaxKind.EventFieldDeclaration:
case SyntaxKind.AddAccessorDeclaration:
case SyntaxKind.RemoveAccessorDeclaration:
case SyntaxKind.IndexerDeclaration:
case SyntaxKind.OperatorDeclaration:
case SyntaxKind.ConversionOperatorDeclaration:
case SyntaxKind.ConstructorDeclaration:
case SyntaxKind.DestructorDeclaration:
return true;
default:
return false;
}
}
public bool IsTypeDeclaration(SyntaxNode node)
=> SyntaxFacts.IsTypeDeclaration(node.Kind());
public bool IsSimpleAssignmentStatement([NotNullWhen(true)] SyntaxNode? statement)
=> statement is ExpressionStatementSyntax exprStatement &&
exprStatement.Expression.IsKind(SyntaxKind.SimpleAssignmentExpression);
public void GetPartsOfAssignmentStatement(
SyntaxNode statement, out SyntaxNode left, out SyntaxToken operatorToken, out SyntaxNode right)
{
GetPartsOfAssignmentExpressionOrStatement(
((ExpressionStatementSyntax)statement).Expression, out left, out operatorToken, out right);
}
public void GetPartsOfAssignmentExpressionOrStatement(
SyntaxNode statement, out SyntaxNode left, out SyntaxToken operatorToken, out SyntaxNode right)
{
var expression = statement;
if (statement is ExpressionStatementSyntax expressionStatement)
{
expression = expressionStatement.Expression;
}
var assignment = (AssignmentExpressionSyntax)expression;
left = assignment.Left;
operatorToken = assignment.OperatorToken;
right = assignment.Right;
}
// C# does not have assignment statements.
public bool IsAnyAssignmentStatement([NotNullWhen(true)] SyntaxNode? node)
=> false;
public SyntaxToken GetIdentifierOfSimpleName(SyntaxNode node)
=> ((SimpleNameSyntax)node).Identifier;
public SyntaxToken GetIdentifierOfVariableDeclarator(SyntaxNode node)
=> ((VariableDeclaratorSyntax)node).Identifier;
public SyntaxToken GetIdentifierOfTypeDeclaration(SyntaxNode node)
=> node switch
{
BaseTypeDeclarationSyntax typeDecl => typeDecl.Identifier,
DelegateDeclarationSyntax delegateDecl => delegateDecl.Identifier,
_ => throw ExceptionUtilities.UnexpectedValue(node),
};
public bool IsDeclaratorOfLocalDeclarationStatement(SyntaxNode declarator, SyntaxNode localDeclarationStatement)
{
return ((LocalDeclarationStatementSyntax)localDeclarationStatement).Declaration.Variables.Contains(
(VariableDeclaratorSyntax)declarator);
}
public bool AreEquivalent(SyntaxToken token1, SyntaxToken token2)
=> SyntaxFactory.AreEquivalent(token1, token2);
public bool AreEquivalent(SyntaxNode? node1, SyntaxNode? node2)
=> SyntaxFactory.AreEquivalent(node1, node2);
public static SyntaxNode GetExpressionOfInvocationExpression(SyntaxNode node)
=> ((InvocationExpressionSyntax)node).Expression;
public bool IsExpressionOfForeach([NotNullWhen(true)] SyntaxNode? node)
=> node?.Parent is ForEachStatementSyntax foreachStatement && foreachStatement.Expression == node;
public SyntaxNode GetExpressionOfForeachStatement(SyntaxNode node)
=> ((CommonForEachStatementSyntax)node).Expression;
public SyntaxNode GetExpressionOfExpressionStatement(SyntaxNode node)
=> ((ExpressionStatementSyntax)node).Expression;
public void GetPartsOfTupleExpression<TArgumentSyntax>(SyntaxNode node,
out SyntaxToken openParen, out SeparatedSyntaxList<TArgumentSyntax> arguments, out SyntaxToken closeParen) where TArgumentSyntax : SyntaxNode
{
var tupleExpression = (TupleExpressionSyntax)node;
openParen = tupleExpression.OpenParenToken;
arguments = (SeparatedSyntaxList<SyntaxNode>)tupleExpression.Arguments;
closeParen = tupleExpression.CloseParenToken;
}
public bool IsPreprocessorDirective(SyntaxTrivia trivia)
=> SyntaxFacts.IsPreprocessorDirective(trivia.Kind());
public bool ContainsInterleavedDirective(TextSpan span, SyntaxToken token, CancellationToken cancellationToken)
=> token.ContainsInterleavedDirective(span, cancellationToken);
public SyntaxTokenList GetModifiers(SyntaxNode? node)
=> node.GetModifiers();
[return: NotNullIfNotNull(nameof(node))]
public SyntaxNode? WithModifiers(SyntaxNode? node, SyntaxTokenList modifiers)
=> node.WithModifiers(modifiers);
public SeparatedSyntaxList<SyntaxNode> GetVariablesOfLocalDeclarationStatement(SyntaxNode node)
=> ((LocalDeclarationStatementSyntax)node).Declaration.Variables;
public SyntaxNode? GetInitializerOfVariableDeclarator(SyntaxNode node)
=> ((VariableDeclaratorSyntax)node).Initializer;
public SyntaxNode GetTypeOfVariableDeclarator(SyntaxNode node)
=> ((VariableDeclarationSyntax)((VariableDeclaratorSyntax)node).Parent!).Type;
public SyntaxNode GetValueOfEqualsValueClause(SyntaxNode node)
=> ((EqualsValueClauseSyntax)node).Value;
public bool IsEqualsValueOfPropertyDeclaration(SyntaxNode? node)
=> node?.Parent is PropertyDeclarationSyntax propertyDeclaration && propertyDeclaration.Initializer == node;
public bool IsConversionExpression([NotNullWhen(true)] SyntaxNode? node)
=> node is CastExpressionSyntax;
public bool IsCastExpression([NotNullWhen(true)] SyntaxNode? node)
=> node is CastExpressionSyntax;
public void GetPartsOfCastExpression(SyntaxNode node, out SyntaxNode type, out SyntaxNode expression)
{
var cast = (CastExpressionSyntax)node;
type = cast.Type;
expression = cast.Expression;
}
public SyntaxToken? GetDeclarationIdentifierIfOverride(SyntaxToken token)
{
if (token.Kind() == SyntaxKind.OverrideKeyword && token.Parent is MemberDeclarationSyntax member)
{
return member.GetNameToken();
}
return null;
}
public SyntaxList<SyntaxNode> GetAttributeLists(SyntaxNode? node)
=> node.GetAttributeLists();
public bool IsParameterNameXmlElementSyntax([NotNullWhen(true)] SyntaxNode? node)
=> node is XmlElementSyntax xmlElement &&
xmlElement.StartTag.Name.LocalName.ValueText == DocumentationCommentXmlNames.ParameterElementName;
public SyntaxList<SyntaxNode> GetContentFromDocumentationCommentTriviaSyntax(SyntaxTrivia trivia)
{
if (trivia.GetStructure() is DocumentationCommentTriviaSyntax documentationCommentTrivia)
{
return documentationCommentTrivia.Content;
}
throw ExceptionUtilities.UnexpectedValue(trivia.Kind());
}
public void GetPartsOfAnyIsTypeExpression(SyntaxNode node, out SyntaxNode expression, out SyntaxNode type)
{
var isPatternExpression = (BinaryExpressionSyntax)node;
expression = isPatternExpression.Left;
type = isPatternExpression.Right;
}
public void GetPartsOfIsPatternExpression(SyntaxNode node, out SyntaxNode left, out SyntaxToken isToken, out SyntaxNode right)
{
var isPatternExpression = (IsPatternExpressionSyntax)node;
left = isPatternExpression.Expression;
isToken = isPatternExpression.IsKeyword;
right = isPatternExpression.Pattern;
}
public bool IsAnyPattern([NotNullWhen(true)] SyntaxNode? node)
=> node is PatternSyntax;
public SyntaxNode GetExpressionOfConstantPattern(SyntaxNode node)
=> ((ConstantPatternSyntax)node).Expression;
public void GetPartsOfDeclarationPattern(SyntaxNode node, out SyntaxNode type, out SyntaxNode designation)
{
var declarationPattern = (DeclarationPatternSyntax)node;
type = declarationPattern.Type;
designation = declarationPattern.Designation;
}
public void GetPartsOfRecursivePattern(SyntaxNode node, out SyntaxNode? type, out SyntaxNode? positionalPart, out SyntaxNode? propertyPart, out SyntaxNode? designation)
{
var recursivePattern = (RecursivePatternSyntax)node;
type = recursivePattern.Type;
positionalPart = recursivePattern.PositionalPatternClause;
propertyPart = recursivePattern.PropertyPatternClause;
designation = recursivePattern.Designation;
}
public bool SupportsNotPattern(ParseOptions options)
=> options.LanguageVersion() >= LanguageVersion.CSharp9;
// C# only supports the pattern form, not the expression form.
public bool SupportsIsNotTypeExpression(ParseOptions options)
=> false;
public bool IsBinaryPattern([NotNullWhen(true)] SyntaxNode? node)
=> node is BinaryPatternSyntax;
public bool IsUnaryPattern([NotNullWhen(true)] SyntaxNode? node)
=> node is UnaryPatternSyntax;
public void GetPartsOfParenthesizedPattern(SyntaxNode node, out SyntaxToken openParen, out SyntaxNode pattern, out SyntaxToken closeParen)
{
var parenthesizedPattern = (ParenthesizedPatternSyntax)node;
openParen = parenthesizedPattern.OpenParenToken;
pattern = parenthesizedPattern.Pattern;
closeParen = parenthesizedPattern.CloseParenToken;
}
public void GetPartsOfBinaryPattern(SyntaxNode node, out SyntaxNode left, out SyntaxToken operatorToken, out SyntaxNode right)
{
var binaryPattern = (BinaryPatternSyntax)node;
left = binaryPattern.Left;
operatorToken = binaryPattern.OperatorToken;
right = binaryPattern.Right;
}
public void GetPartsOfUnaryPattern(SyntaxNode node, out SyntaxToken operatorToken, out SyntaxNode pattern)
{
var unaryPattern = (UnaryPatternSyntax)node;
operatorToken = unaryPattern.OperatorToken;
pattern = unaryPattern.Pattern;
}
public void GetPartsOfRelationalPattern(SyntaxNode node, out SyntaxToken operatorToken, out SyntaxNode expression)
{
var relationalPattern = (RelationalPatternSyntax)node;
operatorToken = relationalPattern.OperatorToken;
expression = relationalPattern.Expression;
}
public SyntaxNode GetTypeOfTypePattern(SyntaxNode node)
=> ((TypePatternSyntax)node).Type;
public bool IsVerbatimInterpolatedStringExpression(SyntaxNode node)
=> node is InterpolatedStringExpressionSyntax interpolatedString &&
interpolatedString.StringStartToken.IsKind(SyntaxKind.InterpolatedVerbatimStringStartToken);
public bool IsInInactiveRegion(SyntaxTree syntaxTree, int position, CancellationToken cancellationToken)
{
if (syntaxTree == null)
{
return false;
}
return syntaxTree.IsInInactiveRegion(position, cancellationToken);
}
#region IsXXX members
public bool IsAnonymousFunctionExpression([NotNullWhen(true)] SyntaxNode? node)
=> node is AnonymousFunctionExpressionSyntax;
public bool IsBaseNamespaceDeclaration([NotNullWhen(true)] SyntaxNode? node)
=> node is BaseNamespaceDeclarationSyntax;
public bool IsBinaryExpression([NotNullWhen(true)] SyntaxNode? node)
=> node is BinaryExpressionSyntax;
public bool IsLiteralExpression([NotNullWhen(true)] SyntaxNode? node)
=> node is LiteralExpressionSyntax;
public bool IsMemberAccessExpression([NotNullWhen(true)] SyntaxNode? node)
=> node is MemberAccessExpressionSyntax;
public bool IsSimpleName([NotNullWhen(true)] SyntaxNode? node)
=> node is SimpleNameSyntax;
public bool IsNamedMemberInitializer([NotNullWhen(true)] SyntaxNode? node)
=> node is AssignmentExpressionSyntax(SyntaxKind.SimpleAssignmentExpression) { Left: IdentifierNameSyntax };
public bool IsElementAccessInitializer([NotNullWhen(true)] SyntaxNode? node)
=> node is AssignmentExpressionSyntax(SyntaxKind.SimpleAssignmentExpression) { Left: ImplicitElementAccessSyntax };
public bool IsObjectMemberInitializer([NotNullWhen(true)] SyntaxNode? node)
=> node is InitializerExpressionSyntax(SyntaxKind.ObjectInitializerExpression);
public bool IsObjectCollectionInitializer([NotNullWhen(true)] SyntaxNode? node)
=> node is InitializerExpressionSyntax(SyntaxKind.CollectionInitializerExpression);
#endregion
#region GetPartsOfXXX members
public void GetPartsOfArgumentList(SyntaxNode node, out SyntaxToken openParenToken, out SeparatedSyntaxList<SyntaxNode> arguments, out SyntaxToken closeParenToken)
{
var argumentListNode = (ArgumentListSyntax)node;
openParenToken = argumentListNode.OpenParenToken;
arguments = argumentListNode.Arguments;
closeParenToken = argumentListNode.CloseParenToken;
}
public void GetPartsOfBaseObjectCreationExpression(SyntaxNode node, out SyntaxNode? argumentList, out SyntaxNode? initializer)
{
var objectCreationExpression = (BaseObjectCreationExpressionSyntax)node;
argumentList = objectCreationExpression.ArgumentList;
initializer = objectCreationExpression.Initializer;
}
public void GetPartsOfBinaryExpression(SyntaxNode node, out SyntaxNode left, out SyntaxToken operatorToken, out SyntaxNode right)
{
var binaryExpression = (BinaryExpressionSyntax)node;
left = binaryExpression.Left;
operatorToken = binaryExpression.OperatorToken;
right = binaryExpression.Right;
}
public void GetPartsOfCompilationUnit(SyntaxNode node, out SyntaxList<SyntaxNode> imports, out SyntaxList<SyntaxNode> attributeLists, out SyntaxList<SyntaxNode> members)
{
var compilationUnit = (CompilationUnitSyntax)node;
imports = compilationUnit.Usings;
attributeLists = compilationUnit.AttributeLists;
members = compilationUnit.Members;
}
public void GetPartsOfConditionalAccessExpression(
SyntaxNode node, out SyntaxNode expression, out SyntaxToken operatorToken, out SyntaxNode whenNotNull)
{
var conditionalAccess = (ConditionalAccessExpressionSyntax)node;
expression = conditionalAccess.Expression;
operatorToken = conditionalAccess.OperatorToken;
whenNotNull = conditionalAccess.WhenNotNull;
}
public void GetPartsOfConditionalExpression(SyntaxNode node, out SyntaxNode condition, out SyntaxNode whenTrue, out SyntaxNode whenFalse)
{
var conditionalExpression = (ConditionalExpressionSyntax)node;
condition = conditionalExpression.Condition;
whenTrue = conditionalExpression.WhenTrue;
whenFalse = conditionalExpression.WhenFalse;
}
public void GetPartsOfGenericName(SyntaxNode node, out SyntaxToken identifier, out SeparatedSyntaxList<SyntaxNode> typeArguments)
{
var genericName = (GenericNameSyntax)node;
identifier = genericName.Identifier;
typeArguments = genericName.TypeArgumentList.Arguments;
}
public void GetPartsOfInterpolationExpression(SyntaxNode node,
out SyntaxToken stringStartToken, out SyntaxList<SyntaxNode> contents, out SyntaxToken stringEndToken)
{
var interpolatedStringExpression = (InterpolatedStringExpressionSyntax)node;
stringStartToken = interpolatedStringExpression.StringStartToken;
contents = interpolatedStringExpression.Contents;
stringEndToken = interpolatedStringExpression.StringEndToken;
}
public void GetPartsOfInvocationExpression(SyntaxNode node, out SyntaxNode expression, out SyntaxNode? argumentList)
{
var invocation = (InvocationExpressionSyntax)node;
expression = invocation.Expression;
argumentList = invocation.ArgumentList;
}
public void GetPartsOfMemberAccessExpression(SyntaxNode node, out SyntaxNode expression, out SyntaxToken operatorToken, out SyntaxNode name)
{
var memberAccess = (MemberAccessExpressionSyntax)node;
expression = memberAccess.Expression;
operatorToken = memberAccess.OperatorToken;
name = memberAccess.Name;
}
public void GetPartsOfBaseNamespaceDeclaration(SyntaxNode node, out SyntaxNode name, out SyntaxList<SyntaxNode> imports, out SyntaxList<SyntaxNode> members)
{
var namespaceDeclaration = (BaseNamespaceDeclarationSyntax)node;
name = namespaceDeclaration.Name;
imports = namespaceDeclaration.Usings;
members = namespaceDeclaration.Members;
}
public void GetPartsOfNamedMemberInitializer(SyntaxNode node, out SyntaxNode identifier, out SyntaxNode expression)
{
var assignment = (AssignmentExpressionSyntax)node;
identifier = assignment.Left;
expression = assignment.Right;
}
public void GetPartsOfObjectCreationExpression(SyntaxNode node, out SyntaxNode type, out SyntaxNode? argumentList, out SyntaxNode? initializer)
{
var objectCreationExpression = (ObjectCreationExpressionSyntax)node;
type = objectCreationExpression.Type;
argumentList = objectCreationExpression.ArgumentList;
initializer = objectCreationExpression.Initializer;
}
public void GetPartsOfParameter(SyntaxNode node, out SyntaxToken identifier, out SyntaxNode? @default)
{
var parameter = (ParameterSyntax)node;
identifier = parameter.Identifier;
@default = parameter.Default;
}
public void GetPartsOfParenthesizedExpression(
SyntaxNode node, out SyntaxToken openParen, out SyntaxNode expression, out SyntaxToken closeParen)
{
var parenthesizedExpression = (ParenthesizedExpressionSyntax)node;
openParen = parenthesizedExpression.OpenParenToken;
expression = parenthesizedExpression.Expression;
closeParen = parenthesizedExpression.CloseParenToken;
}
public void GetPartsOfPrefixUnaryExpression(SyntaxNode node, out SyntaxToken operatorToken, out SyntaxNode operand)
{
var prefixUnaryExpression = (PrefixUnaryExpressionSyntax)node;
operatorToken = prefixUnaryExpression.OperatorToken;
operand = prefixUnaryExpression.Operand;
}
public void GetPartsOfQualifiedName(SyntaxNode node, out SyntaxNode left, out SyntaxToken operatorToken, out SyntaxNode right)
{
var qualifiedName = (QualifiedNameSyntax)node;
left = qualifiedName.Left;
operatorToken = qualifiedName.DotToken;
right = qualifiedName.Right;
}
#endregion
#region GetXXXOfYYY members
public SyntaxNode GetArgumentListOfImplicitElementAccess(SyntaxNode node)
=> ((ImplicitElementAccessSyntax)node).ArgumentList;
public SyntaxNode GetExpressionOfAwaitExpression(SyntaxNode node)
=> ((AwaitExpressionSyntax)node).Expression;
public SyntaxNode GetExpressionOfThrowExpression(SyntaxNode node)
=> ((ThrowExpressionSyntax)node).Expression;
public SyntaxNode? GetExpressionOfThrowStatement(SyntaxNode node)
=> ((ThrowStatementSyntax)node).Expression;
public SeparatedSyntaxList<SyntaxNode> GetInitializersOfObjectMemberInitializer(SyntaxNode node)
=> node is InitializerExpressionSyntax(SyntaxKind.ObjectInitializerExpression) initExpr ? initExpr.Expressions : default;
public SeparatedSyntaxList<SyntaxNode> GetExpressionsOfObjectCollectionInitializer(SyntaxNode node)
=> node is InitializerExpressionSyntax(SyntaxKind.CollectionInitializerExpression) initExpr ? initExpr.Expressions : default;
#endregion
}
}
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