private static SyntaxNode Unwrap(ISyntaxFactsService syntaxFacts, SyntaxNode node)
{
var invocation = node as TInvocationExpression;
if (invocation != null)
{
return(syntaxFacts.GetExpressionOfInvocationExpression(invocation));
}
var memberAccess = node as TMemberAccessExpression;
if (memberAccess != null)
{
return(syntaxFacts.GetExpressionOfMemberAccessExpression(memberAccess));
}
var conditionalAccess = node as TConditionalAccessExpression;
if (conditionalAccess != null)
{
return(syntaxFacts.GetExpressionOfConditionalAccessExpression(conditionalAccess));
}
var elementAccess = node as TElementAccessExpression;
if (elementAccess != null)
{
return(syntaxFacts.GetExpressionOfElementAccessExpression(elementAccess));
}
return(null);
}
private bool TryAnalyzeIndexAssignment(
TExpressionStatementSyntax statement,
out SyntaxNode instance)
{
instance = null;
if (!_syntaxFacts.SupportsIndexingInitializer(statement.SyntaxTree.Options))
{
return(false);
}
if (!_syntaxFacts.IsSimpleAssignmentStatement(statement))
{
return(false);
}
SyntaxNode left, right;
_syntaxFacts.GetPartsOfAssignmentStatement(statement, out left, out right);
if (!_syntaxFacts.IsElementAccessExpression(left))
{
return(false);
}
instance = _syntaxFacts.GetExpressionOfElementAccessExpression(left);
return(true);
}
private bool TryAnalyzeIndexAssignment(
TExpressionStatementSyntax statement,
out SyntaxNode instance)
{
instance = null;
if (!_syntaxFacts.SupportsIndexingInitializer(statement.SyntaxTree.Options))
{
return(false);
}
if (!_syntaxFacts.IsSimpleAssignmentStatement(statement))
{
return(false);
}
_syntaxFacts.GetPartsOfAssignmentStatement(statement,
out var left, out var right);
if (!_syntaxFacts.IsElementAccessExpression(left))
{
return(false);
}
// If we're initializing a variable, then we can't reference that variable on the right
// side of the initialization. Rewriting this into a collection initializer would lead
// to a definite-assignment error.
if (_variableSymbol != null)
{
foreach (var child in right.DescendantNodesAndSelf().OfType <TExpressionSyntax>())
{
if (ValuePatternMatches(child) &&
_variableSymbol.Equals(_semanticModel.GetSymbolInfo(child, _cancellationToken).GetAnySymbol()))
{
return(false);
}
}
}
instance = _syntaxFacts.GetExpressionOfElementAccessExpression(left);
return(true);
}
private static SyntaxNode Unwrap(ISyntaxFactsService syntaxFacts, SyntaxNode node)
{
if (node is TInvocationExpression invocation)
{
return(syntaxFacts.GetExpressionOfInvocationExpression(invocation));
}
if (node is TMemberAccessExpression memberAccess)
{
return(syntaxFacts.GetExpressionOfMemberAccessExpression(memberAccess));
}
if (node is TConditionalAccessExpression conditionalAccess)
{
return(syntaxFacts.GetExpressionOfConditionalAccessExpression(conditionalAccess));
}
if (node is TElementAccessExpression elementAccess)
{
return(syntaxFacts.GetExpressionOfElementAccessExpression(elementAccess));
}
return(null);
}