private async Task <Document> InsertConfigureAwaitAsync(Document document, PrefixUnaryExpressionSyntax oldAwaitExpr, bool arg, CancellationToken cancellationToken)
{
var configureAwait = SyntaxFactory.IdentifierName("ConfigureAwait");
var oldOperand = oldAwaitExpr.Operand;
var newOperand =
SyntaxFactory.InvocationExpression(
SyntaxFactory.MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
oldOperand,
configureAwait
),
SyntaxFactory.ArgumentList(
SyntaxFactory.Token(SyntaxKind.OpenParenToken),
SyntaxFactory.SeparatedList(new[]
{
SyntaxFactory.Argument(
SyntaxFactory.LiteralExpression(arg ? SyntaxKind.TrueLiteralExpression : SyntaxKind.FalseLiteralExpression)
)
}),
SyntaxFactory.Token(SyntaxKind.CloseParenToken)
)
);
var newAwaitExpr = oldAwaitExpr.WithOperand(newOperand);
var oldRoot = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var newRoot = oldRoot.ReplaceNode(oldAwaitExpr, newAwaitExpr);
return(document.WithSyntaxRoot(newRoot));
}
private ExpressionSyntax DifferentiateExpression(
PrefixUnaryExpressionSyntax expression, SyntaxToken x)
{
var innerDerivative = DifferentiateExpression(expression.Operand, x);
switch (expression.Kind())
{
case SyntaxKind.UnaryPlusExpression:
case SyntaxKind.UnaryMinusExpression:
return(expression.WithOperand(innerDerivative));
default:
throw new ArgumentException($"Unexpected syntax kind: {expression.Kind()}");
}
}
public override SyntaxNode VisitPrefixUnaryExpression(PrefixUnaryExpressionSyntax node)
{
if (node.Kind() != SyntaxKind.LogicalNotExpression)
{
throw new InvalidPreprocessorExpressionException("Expected logical not expression");
}
var newExpression = (ExpressionSyntax)node.Operand.Accept(this);
if (newExpression.Kind() == SyntaxKind.LogicalNotExpression)
{
return(((PrefixUnaryExpressionSyntax)newExpression).Operand
.WithLeadingTrivia(node.GetLeadingTrivia())
.WithTrailingTrivia(node.GetTrailingTrivia()));
}
else
{
return(node.Operand != newExpression?
node.WithOperand(newExpression) : node);
}
}
public override SyntaxNode VisitPrefixUnaryExpression(PrefixUnaryExpressionSyntax node)
{
if (node.Kind() != SyntaxKind.LogicalNotExpression)
{
throw new InvalidPreprocessorExpressionException("Expected logical not expression");
}
var newExpression = (ExpressionSyntax)node.Operand.Accept(this);
if (newExpression.Kind() == SyntaxKind.LogicalNotExpression)
{
return ((PrefixUnaryExpressionSyntax)newExpression).Operand
.WithLeadingTrivia(node.GetLeadingTrivia())
.WithTrailingTrivia(node.GetTrailingTrivia());
}
else
{
return node.Operand != newExpression ?
node.WithOperand(newExpression) : node;
}
}