private bool CheckForCastedLocalDeclarationPattern(
SemanticModel semanticModel,
AnonymousFunctionExpressionSyntax anonymousFunction,
CancellationToken cancellationToken,
out LocalDeclarationStatementSyntax localDeclaration)
{
// var t = (Type)(<anonymous function>)
var containingStatement = anonymousFunction.GetAncestor <StatementSyntax>();
if (containingStatement.IsKind(SyntaxKind.LocalDeclarationStatement))
{
localDeclaration = (LocalDeclarationStatementSyntax)containingStatement;
if (localDeclaration.Declaration.Variables.Count == 1)
{
var variableDeclarator = localDeclaration.Declaration.Variables[0];
if (variableDeclarator.Initializer != null)
{
var value = variableDeclarator.Initializer.Value.WalkDownParentheses();
if (value is CastExpressionSyntax castExpression)
{
if (castExpression.Expression.WalkDownParentheses() == anonymousFunction)
{
return(true);
}
}
}
}
}
localDeclaration = null;
return(false);
}
private static SyntaxNode ReplaceAnonymousWithLocalFunction(
Workspace workspace,
SyntaxNode currentRoot,
LocalDeclarationStatementSyntax localDeclaration,
AnonymousFunctionExpressionSyntax anonymousFunction,
IMethodSymbol delegateMethod,
ParameterListSyntax parameterList,
bool makeStatic
)
{
var newLocalFunctionStatement = CreateLocalFunctionStatement(
localDeclaration,
anonymousFunction,
delegateMethod,
parameterList,
makeStatic
)
.WithTriviaFrom(localDeclaration)
.WithAdditionalAnnotations(Formatter.Annotation);
var editor = new SyntaxEditor(currentRoot, workspace);
editor.ReplaceNode(localDeclaration, newLocalFunctionStatement);
var anonymousFunctionStatement = anonymousFunction.GetAncestor <StatementSyntax>();
if (anonymousFunctionStatement != localDeclaration)
{
// This is the split decl+init form. Remove the second statement as we're
// merging into the first one.
editor.RemoveNode(anonymousFunctionStatement);
}
return(editor.GetChangedRoot());
}