private ITypeSymbol TryGetArgsArgumentType(
SemanticModel semanticModel,
SeparatedSyntaxList <SyntaxNode> arguments,
ImmutableArray <IParameterSymbol> parameters,
ISyntaxFactsService syntaxFacts)
{
var argsArgument = TryGetArgument(semanticModel, NameOfArgsParameter, arguments, parameters);
if (argsArgument == null)
{
return(null);
}
var expression = syntaxFacts.GetExpressionOfArgument(argsArgument);
return(semanticModel.GetTypeInfo(expression).Type);
}
private async Task <Document> CreateInterpolatedString(
TInvocationExpressionSyntax invocation,
Document document,
ISyntaxFactsService syntaxFactsService,
CancellationToken cancellationToken)
{
var semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var arguments = syntaxFactsService.GetArgumentsOfInvocationExpression(invocation);
var literalExpression = syntaxFactsService.GetExpressionOfArgument(arguments[0]) as TLiteralExpressionSyntax;
var text = literalExpression.GetFirstToken().ToString();
var syntaxGenerator = document.Project.LanguageServices.GetService <SyntaxGenerator>();
var expandedArguments = GetExpandedArguments(semanticModel, arguments, syntaxGenerator, syntaxFactsService);
var interpolatedString = GetInterpolatedString(text);
var newInterpolatedString = VisitArguments(expandedArguments, interpolatedString, syntaxFactsService);
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var newRoot = root.ReplaceNode(invocation, newInterpolatedString.WithTriviaFrom(invocation));
return(document.WithSyntaxRoot(newRoot));
}
static bool IsValidPlaceholderToInterpolatedString(
TInvocationExpressionSyntax invocation,
ISyntaxFactsService syntaxFactsService,
SemanticModel semanticModel,
ImmutableArray <IMethodSymbol> formatMethods,
AbstractConvertPlaceholderToInterpolatedStringRefactoringProvider <
TInvocationExpressionSyntax,
TExpressionSyntax,
TArgumentSyntax,
TLiteralExpressionSyntax,
TArgumentListExpressionSyntax
> thisInstance,
CancellationToken cancellationToken
)
{
var arguments = syntaxFactsService.GetArgumentsOfInvocationExpression(invocation);
if (arguments.Count >= 2)
{
if (
syntaxFactsService.GetExpressionOfArgument(
GetFormatArgument(arguments, syntaxFactsService)
)
is TLiteralExpressionSyntax firstArgumentExpression &&
syntaxFactsService.IsStringLiteral(
firstArgumentExpression.GetFirstToken()
)
)
{
var invocationSymbol =
semanticModel.GetSymbolInfo(invocation, cancellationToken).Symbol;
if (formatMethods.Contains(invocationSymbol))
{
return(true);
}
}
}
return(false);
}
protected SyntaxNode?TryGetFormatStringLiteralExpressionSyntax(
SeparatedSyntaxList <SyntaxNode> arguments,
ImmutableArray <IParameterSymbol> parameters,
ISyntaxFactsService syntaxFacts)
{
var formatArgumentSyntax = TryGetArgument(
NameOfFormatStringParameter,
arguments,
parameters);
if (formatArgumentSyntax == null)
{
return(null);
}
if (!syntaxFacts.IsStringLiteralExpression(syntaxFacts.GetExpressionOfArgument(formatArgumentSyntax)))
{
return(null);
}
return(GetArgumentExpression(formatArgumentSyntax));
}
private static TArgumentSyntax DetermineFirstArgumentToAdd(
SemanticModel semanticModel,
ISyntaxFactsService syntaxFacts,
StringComparer comparer,
IMethodSymbol method,
SeparatedSyntaxList <TArgumentSyntax> arguments)
{
var compilation = semanticModel.Compilation;
var methodParameterNames = new HashSet <string>(comparer);
methodParameterNames.AddRange(method.Parameters.Select(p => p.Name));
for (int i = 0, n = arguments.Count; i < n; i++)
{
var argument = arguments[i];
var argumentName = syntaxFacts.GetNameForArgument(argument);
if (!string.IsNullOrWhiteSpace(argumentName))
{
// If the user provided an argument-name and we don't have any parameters that
// match, then this is the argument we want to add a parameter for.
if (!methodParameterNames.Contains(argumentName))
{
return(argument);
}
}
else
{
// Positional argument. If the position is beyond what the method supports,
// then this definitely is an argument we could add.
if (i >= method.Parameters.Length)
{
if (method.Parameters.LastOrDefault()?.IsParams == true)
{
// Last parameter is a params. We can't place any parameters past it.
return(null);
}
return(argument);
}
// Now check the type of the argument versus the type of the parameter. If they
// don't match, then this is the argument we should make the parameter for.
var expressionOfArgument = syntaxFacts.GetExpressionOfArgument(argument);
if (expressionOfArgument is null)
{
return(null);
}
var argumentTypeInfo = semanticModel.GetTypeInfo(expressionOfArgument);
var isNullLiteral = syntaxFacts.IsNullLiteralExpression(expressionOfArgument);
var isDefaultLiteral = syntaxFacts.IsDefaultLiteralExpression(expressionOfArgument);
if (argumentTypeInfo.Type == null && argumentTypeInfo.ConvertedType == null)
{
// Didn't know the type of the argument. We shouldn't assume it doesn't
// match a parameter. However, if the user wrote 'null' and it didn't
// match anything, then this is the problem argument.
if (!isNullLiteral && !isDefaultLiteral)
{
continue;
}
}
var parameter = method.Parameters[i];
if (!TypeInfoMatchesType(
compilation, argumentTypeInfo, parameter.Type,
isNullLiteral, isDefaultLiteral))
{
if (TypeInfoMatchesWithParamsExpansion(
compilation, argumentTypeInfo, parameter,
isNullLiteral, isDefaultLiteral))
{
// The argument matched if we expanded out the params-parameter.
// As the params-parameter has to be last, there's nothing else to
// do here.
return(null);
}
return(argument);
}
}
}
return(null);
}
private bool MatchesPattern(ISyntaxFactsService syntaxFacts, SyntaxNode node1, SyntaxNode node2) => syntaxFacts.IsNullLiteralExpression(syntaxFacts.GetExpressionOfArgument(node1)) && !syntaxFacts.IsNullLiteralExpression(syntaxFacts.GetExpressionOfArgument(node2));