public static bool TryConvertToArrowExpressionBody(
this BlockSyntax block,
SyntaxKind declarationKind,
ParseOptions options,
ExpressionBodyPreference preference,
out ArrowExpressionClauseSyntax arrowExpression,
out SyntaxToken semicolonToken
)
{
var version = ((CSharpParseOptions)options).LanguageVersion;
// We can always use arrow-expression bodies in C# 7 or above.
// We can also use them in C# 6, but only a select set of member kinds.
var acceptableVersion =
version >= LanguageVersion.CSharp7 ||
(version >= LanguageVersion.CSharp6 && IsSupportedInCSharp6(declarationKind));
if (
!acceptableVersion ||
!block.TryConvertToExpressionBody(
options,
preference,
out var expression,
out semicolonToken
)
)
{
arrowExpression = null;
semicolonToken = default;
return(false);
}
arrowExpression = SyntaxFactory.ArrowExpressionClause(expression);
return(true);
}
public static bool TryConvertToExpressionBody(
this BlockSyntax block, ParseOptions options,
ExpressionBodyPreference preference,
out ArrowExpressionClauseSyntax arrowExpression,
out SyntaxToken semicolonToken)
{
if (preference != ExpressionBodyPreference.Never &&
(options as CSharpParseOptions)?.LanguageVersion >= LanguageVersion.CSharp7)
{
if (block != null && block.Statements.Count == 1)
{
var firstStatement = block.Statements[0];
if (TryGetExpression(firstStatement, out var expression, out semicolonToken) &&
MatchesPreference(expression, preference))
{
arrowExpression = SyntaxFactory.ArrowExpressionClause(expression);
// The close brace of the block may have important trivia on it (like
// comments or directives). Preserve them on the semicolon when we
// convert to an expression body.
semicolonToken = semicolonToken.WithAppendedTrailingTrivia(
block.CloseBraceToken.LeadingTrivia.Where(t => !t.IsWhitespaceOrEndOfLine()));
return(true);
}
}
}
arrowExpression = null;
semicolonToken = default(SyntaxToken);
return(false);
}
public CSharpCodeGenerationPreferences(
bool placeSystemNamespaceFirst,
ExpressionBodyPreference preferExpressionBodiedMethods,
ExpressionBodyPreference preferExpressionBodiedAccessors,
ExpressionBodyPreference preferExpressionBodiedProperties,
ExpressionBodyPreference preferExpressionBodiedIndexers,
ExpressionBodyPreference preferExpressionBodiedConstructors,
ExpressionBodyPreference preferExpressionBodiedOperators,
ExpressionBodyPreference preferExpressionBodiedLocalFunctions,
NamespaceDeclarationPreference namespaceDeclarations,
AddImportPlacement preferredUsingDirectivePlacement,
LanguageVersion languageVersion)
: base(placeSystemNamespaceFirst)
{
PreferExpressionBodiedMethods = preferExpressionBodiedMethods;
PreferExpressionBodiedAccessors = preferExpressionBodiedAccessors;
PreferExpressionBodiedProperties = preferExpressionBodiedProperties;
PreferExpressionBodiedIndexers = preferExpressionBodiedIndexers;
PreferExpressionBodiedConstructors = preferExpressionBodiedConstructors;
PreferExpressionBodiedOperators = preferExpressionBodiedOperators;
PreferExpressionBodiedLocalFunctions = preferExpressionBodiedLocalFunctions;
NamespaceDeclarations = namespaceDeclarations;
PreferredUsingDirectivePlacement = preferredUsingDirectivePlacement;
LanguageVersion = languageVersion;
}
private static bool TryGetExpressionBody(
BasePropertyDeclarationSyntax baseProperty,
ParseOptions options,
ExpressionBodyPreference preference,
out ArrowExpressionClauseSyntax arrowExpression,
out SyntaxToken semicolonToken
)
{
var accessorList = baseProperty.AccessorList;
if (preference != ExpressionBodyPreference.Never && accessorList.Accessors.Count == 1)
{
var accessor = accessorList.Accessors[0];
if (accessor.IsKind(SyntaxKind.GetAccessorDeclaration))
{
return(TryGetArrowExpressionBody(
baseProperty.Kind(),
accessor,
options,
preference,
out arrowExpression,
out semicolonToken
));
}
}
arrowExpression = null;
semicolonToken = default;
return(false);
}
private static SyntaxNode UseExpressionOrBlockBodyIfDesired(
LanguageVersion languageVersion,
MethodDeclarationSyntax methodDeclaration,
ExpressionBodyPreference expressionBodyPreference,
bool createReturnStatementForExpression)
{
if (methodDeclaration.Body != null && expressionBodyPreference != ExpressionBodyPreference.Never)
{
if (methodDeclaration.Body.TryConvertToArrowExpressionBody(
methodDeclaration.Kind(), languageVersion, expressionBodyPreference,
out var arrowExpression, out var semicolonToken))
{
return(methodDeclaration.WithBody(null)
.WithExpressionBody(arrowExpression)
.WithSemicolonToken(semicolonToken)
.WithAdditionalAnnotations(Formatter.Annotation));
}
}
else if (methodDeclaration.ExpressionBody != null && expressionBodyPreference == ExpressionBodyPreference.Never)
{
if (methodDeclaration.ExpressionBody.TryConvertToBlock(
methodDeclaration.SemicolonToken, createReturnStatementForExpression, out var block))
{
return(methodDeclaration.WithExpressionBody(null)
.WithSemicolonToken(default)
public static bool TryConvertToExpressionBody(
this BlockSyntax block, SyntaxKind declarationKind,
ParseOptions options, ExpressionBodyPreference preference,
out ExpressionSyntax expression,
out SyntaxToken semicolonToken)
{
if (preference != ExpressionBodyPreference.Never &&
block != null && block.Statements.Count == 1)
{
var version = ((CSharpParseOptions)options).LanguageVersion;
var acceptableVersion =
version >= LanguageVersion.CSharp7 ||
(version >= LanguageVersion.CSharp6 && IsSupportedInCSharp6(declarationKind));
if (acceptableVersion)
{
var firstStatement = block.Statements[0];
if (TryGetExpression(version, firstStatement, out expression, out semicolonToken) &&
MatchesPreference(expression, preference))
{
// The close brace of the block may have important trivia on it (like
// comments or directives). Preserve them on the semicolon when we
// convert to an expression body.
semicolonToken = semicolonToken.WithAppendedTrailingTrivia(
block.CloseBraceToken.LeadingTrivia.Where(t => !t.IsWhitespaceOrEndOfLine()));
return(true);
}
}
}
expression = null;
semicolonToken = default;
return(false);
}
public static bool TryConvertToExpressionBody(
this BlockSyntax?block,
LanguageVersion languageVersion,
ExpressionBodyPreference preference,
[NotNullWhen(true)] out ExpressionSyntax?expression,
out SyntaxToken semicolonToken)
{
if (preference != ExpressionBodyPreference.Never &&
block != null && block.Statements.Count == 1)
{
var firstStatement = block.Statements[0];
if (TryGetExpression(firstStatement, languageVersion, out expression, out semicolonToken) &&
MatchesPreference(expression, preference))
{
// The close brace of the block may have important trivia on it (like
// comments or directives). Preserve them on the semicolon when we
// convert to an expression body.
semicolonToken = semicolonToken.WithAppendedTrailingTrivia(
block.CloseBraceToken.LeadingTrivia.Where(t => !t.IsWhitespaceOrEndOfLine()));
return(true);
}
}
expression = null;
semicolonToken = default;
return(false);
}
public static bool TryConvertToArrowExpressionBody(
this BlockSyntax block,
SyntaxKind declarationKind,
LanguageVersion languageVersion,
ExpressionBodyPreference preference,
[NotNullWhen(true)] out ArrowExpressionClauseSyntax?arrowExpression,
out SyntaxToken semicolonToken)
{
// We can always use arrow-expression bodies in C# 7 or above.
// We can also use them in C# 6, but only a select set of member kinds.
var acceptableVersion =
languageVersion >= LanguageVersion.CSharp7 ||
(languageVersion >= LanguageVersion.CSharp6 && IsSupportedInCSharp6(declarationKind));
if (acceptableVersion &&
block.TryConvertToExpressionBody(languageVersion, preference, out var expression, out semicolonToken))
{
arrowExpression = SyntaxFactory.ArrowExpressionClause(expression);
return(true);
}
arrowExpression = null;
semicolonToken = default;
return(false);
}
private static bool TryGetArrowExpressionBody(
SyntaxKind declaratoinKind,
AccessorDeclarationSyntax accessor,
ParseOptions options,
ExpressionBodyPreference preference,
out ArrowExpressionClauseSyntax arrowExpression,
out SyntaxToken semicolonToken
)
{
// If the accessor has an expression body already, then use that as the expression body
// for the property.
if (accessor.ExpressionBody != null)
{
arrowExpression = accessor.ExpressionBody;
semicolonToken = accessor.SemicolonToken;
return(true);
}
return(accessor.Body.TryConvertToArrowExpressionBody(
declaratoinKind,
options,
preference,
out arrowExpression,
out semicolonToken
));
}
protected override async Task <ImmutableArray <CodeAction> > ComputeOpposingRefactoringsWhenAnalyzerActiveAsync(
Document document, TextSpan span, ExpressionBodyPreference option, CancellationToken cancellationToken)
{
if (option == ExpressionBodyPreference.Never)
{
// the user wants block-bodies (and the analyzer will be trying to enforce that). So
// the reverse of this is that we want to offer the refactoring to convert a
// block-body to an expression-body whenever possible.
return(await ComputeRefactoringsAsync(
document, span, ExpressionBodyPreference.WhenPossible, cancellationToken).ConfigureAwait(false));
}
else if (option == ExpressionBodyPreference.WhenPossible)
{
// the user likes expression-bodies whenever possible, and the analyzer will be
// trying to enforce that. So the reverse of this is that we want to offer the
// refactoring to convert an expression-body to a block-body whenever possible.
return(await ComputeRefactoringsAsync(
document, span, ExpressionBodyPreference.Never, cancellationToken).ConfigureAwait(false));
}
else if (option == ExpressionBodyPreference.WhenOnSingleLine)
{
// the user likes expression-bodies *if* the body would be on a single line. this
// means if we hit an block-body with an expression on a single line, then the
// analyzer will handle it for us.
// So we need to handle the cases of either hitting an expression-body and wanting
// to convert it to a block-body *or* hitting an block-body over *multiple* lines and
// wanting to offer to convert to an expression-body.
// Always offer to convert an expression to a block since the analyzer will never
// offer that. For this option setting.
var useBlockRefactorings = await ComputeRefactoringsAsync(
document, span, ExpressionBodyPreference.Never, cancellationToken).ConfigureAwait(false);
var whenOnSingleLineRefactorings = await ComputeRefactoringsAsync(
document, span, ExpressionBodyPreference.WhenOnSingleLine, cancellationToken).ConfigureAwait(false);
if (whenOnSingleLineRefactorings.Length > 0)
{
// this block lambda would be converted to an expression lambda based on the
// analyzer alone. So we don't want to offer that as a refactoring ourselves.
return(useBlockRefactorings);
}
// The lambda block statement wasn't on a single line. So the analyzer would
// not offer to convert it to an expression body. So we should can offer that
// as a refactoring if possible.
var whenPossibleRefactorings = await ComputeRefactoringsAsync(
document, span, ExpressionBodyPreference.WhenPossible, cancellationToken).ConfigureAwait(false);
return(useBlockRefactorings.AddRange(whenPossibleRefactorings));
}
else
{
throw ExceptionUtilities.UnexpectedValue(option);
}
}
protected override bool TryConvertToExpressionBody(
IndexerDeclarationSyntax declaration, ParseOptions options,
ExpressionBodyPreference conversionPreference,
out ArrowExpressionClauseSyntax arrowExpression,
out SyntaxToken semicolonToken)
{
return(this.TryConvertToExpressionBodyForBaseProperty(
declaration, options, conversionPreference,
out arrowExpression, out semicolonToken));
}
internal static bool TryConvertToExpressionBody(
LambdaExpressionSyntax declaration,
LanguageVersion languageVersion,
ExpressionBodyPreference conversionPreference,
[NotNullWhen(true)] out ExpressionSyntax?expression)
{
var body = declaration.Body as BlockSyntax;
return(body.TryConvertToExpressionBody(languageVersion, conversionPreference, out expression, out _));
}
private static bool TryConvertToExpressionBody(
LambdaExpressionSyntax declaration,
ParseOptions options, ExpressionBodyPreference conversionPreference,
out ExpressionSyntax expressionWhenOnSingleLine,
out SyntaxToken semicolonWhenOnSingleLine)
{
return(TryConvertToExpressionBodyWorker(
declaration, options, conversionPreference,
out expressionWhenOnSingleLine, out semicolonWhenOnSingleLine));
}
private static bool TryConvertToExpressionBodyWorker(
LambdaExpressionSyntax declaration, ParseOptions options, ExpressionBodyPreference conversionPreference,
out ExpressionSyntax expressionWhenOnSingleLine, out SyntaxToken semicolonWhenOnSingleLine)
{
var body = declaration.Body as BlockSyntax;
return(body.TryConvertToExpressionBody(
declaration.Kind(), options, conversionPreference,
out expressionWhenOnSingleLine, out semicolonWhenOnSingleLine));
}
protected virtual bool TryConvertToExpressionBody(
TDeclaration declaration,
ExpressionBodyPreference conversionPreference,
[NotNullWhen(true)] out ArrowExpressionClauseSyntax?expressionWhenOnSingleLine,
out SyntaxToken semicolonWhenOnSingleLine)
{
return(TryConvertToExpressionBodyWorker(
declaration, conversionPreference,
out expressionWhenOnSingleLine, out semicolonWhenOnSingleLine));
}
public static bool MatchesPreference(
ExpressionSyntax expression, ExpressionBodyPreference preference)
{
if (preference == ExpressionBodyPreference.WhenPossible)
{
return(true);
}
Contract.ThrowIfFalse(preference == ExpressionBodyPreference.WhenOnSingleLine);
return(CSharpSyntaxFactsService.Instance.IsOnSingleLine(expression, fullSpan: false));
}
protected virtual bool TryConvertToExpressionBody(
TDeclaration declaration,
ParseOptions options, ExpressionBodyPreference conversionPreference,
out ArrowExpressionClauseSyntax expressionWhenOnSingleLine,
out SyntaxToken semicolonWhenOnSingleLine)
{
var body = this.GetBody(declaration);
return(body.TryConvertToExpressionBody(options, conversionPreference,
out expressionWhenOnSingleLine, out semicolonWhenOnSingleLine));
}
private static object ParseExpressionBodyPreference(string value, ExpressionBodyPreference @default)
{
if (bool.TryParse(value, out var boolValue))
{
return(boolValue ? ExpressionBodyPreference.WhenPossible : ExpressionBodyPreference.Never);
}
if (value == "when_on_single_line")
{
return(ExpressionBodyPreference.WhenOnSingleLine);
}
return(@default);
}
internal static bool CanOfferUseBlockBody(
SemanticModel semanticModel, ExpressionBodyPreference preference,
LambdaExpressionSyntax declaration, CancellationToken cancellationToken)
{
var userPrefersBlockBodies = preference == ExpressionBodyPreference.Never;
if (!userPrefersBlockBodies)
{
// If the user doesn't even want block bodies, then certainly do not offer.
return(false);
}
var expressionBodyOpt = GetBodyAsExpression(declaration);
if (expressionBodyOpt == null)
{
// they already have a block body.
return(false);
}
// We need to know what sort of lambda this is (void returning or not) in order to be
// able to create the right sort of block body (i.e. with a return-statement or
// expr-statement). So, if we can't figure out what lambda type this is, we should not
// proceed.
if (semanticModel.GetTypeInfo(declaration, cancellationToken).ConvertedType is not INamedTypeSymbol lambdaType || lambdaType.DelegateInvokeMethod == null)
{
return(false);
}
var canOffer = expressionBodyOpt.TryConvertToStatement(
semicolonTokenOpt: null, createReturnStatementForExpression: false, out _);
if (!canOffer)
{
// Couldn't even convert the expression into statement form.
return(false);
}
var languageVersion = declaration.SyntaxTree.Options.LanguageVersion();
if (expressionBodyOpt.IsKind(SyntaxKind.ThrowExpression) &&
languageVersion < LanguageVersion.CSharp7)
{
// Can't convert this prior to C# 7 because ```a => throw ...``` isn't allowed.
return(false);
}
return(true);
}
private static async Task ComputeRefactoringsAsync(
CodeRefactoringContext context, ExpressionBodyPreference option, bool analyzerActive)
{
var document = context.Document;
var span = context.Span;
var cancellationToken = context.CancellationToken;
var computationTask = analyzerActive
? ComputeOpposingRefactoringsWhenAnalyzerActiveAsync(document, span, option, cancellationToken)
: ComputeAllRefactoringsWhenAnalyzerInactiveAsync(document, span, cancellationToken);
var codeActions = await computationTask.ConfigureAwait(false);
context.RegisterRefactorings(codeActions);
}
private static async Task <ImmutableArray <CodeAction> > ComputeRefactoringsAsync(
Document document,
TextSpan span,
ExpressionBodyPreference option,
CancellationToken cancellationToken
)
{
var lambdaNode = await document
.TryGetRelevantNodeAsync <LambdaExpressionSyntax>(span, cancellationToken)
.ConfigureAwait(false);
if (lambdaNode == null)
{
return(ImmutableArray <CodeAction> .Empty);
}
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var optionSet = await document.GetOptionsAsync(cancellationToken).ConfigureAwait(false);
using var resultDisposer = ArrayBuilder <CodeAction> .GetInstance(out var result);
if (CanOfferUseExpressionBody(option, lambdaNode))
{
result.Add(
new MyCodeAction(
UseExpressionBodyTitle.ToString(),
c => UpdateDocumentAsync(document, root, lambdaNode, c)
)
);
}
var semanticModel = await document
.GetSemanticModelAsync(cancellationToken)
.ConfigureAwait(false);
if (CanOfferUseBlockBody(semanticModel, option, lambdaNode, cancellationToken))
{
result.Add(
new MyCodeAction(
UseBlockBodyTitle.ToString(),
c => UpdateDocumentAsync(document, root, lambdaNode, c)
)
);
}
return(result.ToImmutable());
}
public static bool TryConvertToArrowExpressionBody(
this BlockSyntax block, SyntaxKind declarationKind,
ParseOptions options, ExpressionBodyPreference preference,
out ArrowExpressionClauseSyntax arrowExpression,
out SyntaxToken semicolonToken)
{
if (!block.TryConvertToExpressionBody(
declarationKind, options, preference,
out var expression, out semicolonToken))
{
arrowExpression = default;
return(false);
}
arrowExpression = SyntaxFactory.ArrowExpressionClause(expression);
return(true);
}
private bool TryConvertToExpressionBodyWorker(
SyntaxNode declaration, ExpressionBodyPreference conversionPreference,
[NotNullWhen(true)] out ArrowExpressionClauseSyntax?expressionWhenOnSingleLine, out SyntaxToken semicolonWhenOnSingleLine)
{
var body = GetBody(declaration);
if (body is null)
{
expressionWhenOnSingleLine = null;
semicolonWhenOnSingleLine = default;
return(false);
}
var languageVersion = ((CSharpParseOptions)body.SyntaxTree.Options).LanguageVersion;
return(body.TryConvertToArrowExpressionBody(
declaration.Kind(), languageVersion, conversionPreference,
out expressionWhenOnSingleLine, out semicolonWhenOnSingleLine));
}
private static ImmutableArray <SyntaxNode> ConvertPropertyToMembers(
LanguageVersion languageVersion,
SyntaxGenerator generator,
IPropertySymbol property,
PropertyDeclarationSyntax propertyDeclaration,
IFieldSymbol?propertyBackingField,
ExpressionBodyPreference expressionBodyPreference,
string desiredGetMethodName,
string desiredSetMethodName,
CancellationToken cancellationToken)
{
using var _ = ArrayBuilder <SyntaxNode> .GetInstance(out var result);
if (propertyBackingField != null)
{
var initializer = propertyDeclaration.Initializer?.Value;
result.Add(generator.FieldDeclaration(propertyBackingField, initializer));
}
var getMethod = property.GetMethod;
if (getMethod != null)
{
result.Add(GetGetMethod(
languageVersion,
generator, propertyDeclaration, propertyBackingField,
getMethod, desiredGetMethodName, expressionBodyPreference,
cancellationToken));
}
var setMethod = property.SetMethod;
if (setMethod != null)
{
result.Add(GetSetMethod(
languageVersion,
generator, propertyDeclaration, propertyBackingField,
setMethod, desiredSetMethodName, expressionBodyPreference,
cancellationToken));
}
return(result.ToImmutable());
}
private async Task <ImmutableArray <CodeAction> > ComputeRefactoringsAsync(
Document document, TextSpan span, ExpressionBodyPreference option, CancellationToken cancellationToken)
{
if (span.Length > 0)
{
return(ImmutableArray <CodeAction> .Empty);
}
var position = span.Start;
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var lambdaNode = root.FindToken(position).Parent.FirstAncestorOrSelf <LambdaExpressionSyntax>();
if (lambdaNode == null)
{
return(ImmutableArray <CodeAction> .Empty);
}
var optionSet = await document.GetOptionsAsync(cancellationToken).ConfigureAwait(false);
var result = ArrayBuilder <CodeAction> .GetInstance();
if (CanOfferUseExpressionBody(option, lambdaNode))
{
result.Add(new MyCodeAction(
UseExpressionBodyTitle.ToString(),
c => UpdateDocumentAsync(
document, root, lambdaNode, c)));
}
var semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
if (CanOfferUseBlockBody(semanticModel, option, lambdaNode, cancellationToken))
{
result.Add(new MyCodeAction(
UseBlockBodyTitle.ToString(),
c => UpdateDocumentAsync(
document, root, lambdaNode, c)));
}
return(result.ToImmutableAndFree());
}
private static SyntaxNode GetGetMethod(
LanguageVersion languageVersion,
SyntaxGenerator generator,
PropertyDeclarationSyntax propertyDeclaration,
IFieldSymbol?propertyBackingField,
IMethodSymbol getMethod,
string desiredGetMethodName,
ExpressionBodyPreference expressionBodyPreference,
CancellationToken cancellationToken)
{
var methodDeclaration = GetGetMethodWorker(
generator, propertyDeclaration, propertyBackingField, getMethod,
desiredGetMethodName, cancellationToken);
methodDeclaration = CopyLeadingTrivia(propertyDeclaration, methodDeclaration, ConvertValueToReturnsRewriter.Instance);
return(UseExpressionOrBlockBodyIfDesired(
languageVersion, methodDeclaration, expressionBodyPreference,
createReturnStatementForExpression: true));
}
private static SyntaxNode GetSetMethod(
LanguageVersion languageVersion,
SyntaxGenerator generator,
PropertyDeclarationSyntax propertyDeclaration,
IFieldSymbol?propertyBackingField,
IMethodSymbol setMethod,
string desiredSetMethodName,
ExpressionBodyPreference expressionBodyPreference,
CancellationToken cancellationToken)
{
var methodDeclaration = GetSetMethodWorker(
generator, propertyDeclaration, propertyBackingField,
setMethod, desiredSetMethodName, cancellationToken);
// The analyzer doesn't report diagnostics when the trivia contains preprocessor directives, so it's safe
// to copy the complete leading trivia to both generated methods.
methodDeclaration = CopyLeadingTrivia(propertyDeclaration, methodDeclaration, ConvertValueToParamRewriter.Instance);
return(UseExpressionOrBlockBodyIfDesired(
languageVersion, methodDeclaration, expressionBodyPreference,
createReturnStatementForExpression: false));
}
public static bool TryConvertToArrowExpressionBody(
this BlockSyntax block,
SyntaxKind declarationKind,
LanguageVersion languageVersion,
ExpressionBodyPreference preference,
[NotNullWhen(true)] out ArrowExpressionClauseSyntax?arrowExpression,
out SyntaxToken semicolonToken)
{
// We can always use arrow-expression bodies in C# 7 or above.
// We can also use them in C# 6, but only a select set of member kinds.
var acceptableVersion =
languageVersion >= LanguageVersion.CSharp7 ||
(languageVersion >= LanguageVersion.CSharp6 && IsSupportedInCSharp6(declarationKind));
if (acceptableVersion &&
block.TryConvertToExpressionBody(languageVersion, preference, out var expression, out semicolonToken))
{
arrowExpression = SyntaxFactory.ArrowExpressionClause(expression);
var parent = block.GetRequiredParent();
if (parent.Kind() == SyntaxKind.GetAccessorDeclaration)
{
var comments = parent.GetLeadingTrivia().Where(t => !t.IsWhitespaceOrEndOfLine());
if (!comments.IsEmpty())
{
arrowExpression = arrowExpression.WithLeadingTrivia(
parent.GetLeadingTrivia());
}
}
return(true);
}
arrowExpression = null;
semicolonToken = default;
return(false);
}
protected override bool TryConvertToExpressionBody(
PropertyDeclarationSyntax declaration, ParseOptions options,
ExpressionBodyPreference conversionPreference,
out ArrowExpressionClauseSyntax arrowExpression,
out SyntaxToken semicolonToken)
{
if (base.TryConvertToExpressionBody(declaration, options, conversionPreference, out arrowExpression, out semicolonToken))
{
return(true);
}
var getAccessor = GetSingleGetAccessor(declaration.AccessorList);
if (getAccessor?.ExpressionBody != null &&
BlockSyntaxExtensions.MatchesPreference(getAccessor.ExpressionBody.Expression, conversionPreference))
{
arrowExpression = SyntaxFactory.ArrowExpressionClause(getAccessor.ExpressionBody.Expression);
semicolonToken = getAccessor.SemicolonToken;
return(true);
}
return(false);
}
protected bool TryConvertToExpressionBodyForBaseProperty(
BasePropertyDeclarationSyntax declaration,
ExpressionBodyPreference conversionPreference,
[NotNullWhen(true)] out ArrowExpressionClauseSyntax?arrowExpression,
out SyntaxToken semicolonToken)
{
if (TryConvertToExpressionBodyWorker(declaration, conversionPreference, out arrowExpression, out semicolonToken))
{
return(true);
}
var getAccessor = GetSingleGetAccessor(declaration.AccessorList);
if (getAccessor?.ExpressionBody != null &&
BlockSyntaxExtensions.MatchesPreference(getAccessor.ExpressionBody.Expression, conversionPreference))
{
arrowExpression = SyntaxFactory.ArrowExpressionClause(getAccessor.ExpressionBody.Expression);
semicolonToken = getAccessor.SemicolonToken;
return(true);
}
return(false);
}
