public static bool TryAnalyzeVariableDeclaration(
SemanticModel semanticModel,
VariableDeclarationSyntax variableDeclaration,
[NotNullWhen(true)] out INamedTypeSymbol?tupleType,
out ImmutableArray <MemberAccessExpressionSyntax> memberAccessExpressions,
CancellationToken cancellationToken)
{
tupleType = null;
memberAccessExpressions = default;
// Only support code of the form:
//
// var t = ...; or
// (T1 e1, ..., TN eN) t = ...
if (!variableDeclaration.IsParentKind(SyntaxKind.LocalDeclarationStatement))
{
return(false);
}
if (variableDeclaration.Variables.Count != 1)
{
return(false);
}
var declarator = variableDeclaration.Variables[0];
if (declarator.Initializer == null)
{
return(false);
}
var local = (ILocalSymbol)semanticModel.GetRequiredDeclaredSymbol(declarator, cancellationToken);
var initializerConversion = semanticModel.GetConversion(declarator.Initializer.Value, cancellationToken);
return(TryAnalyze(
semanticModel, local, variableDeclaration.Type, declarator.Identifier, initializerConversion,
variableDeclaration.GetRequiredParent().GetRequiredParent(), out tupleType, out memberAccessExpressions, cancellationToken));
}