public static bool Applicable(SemanticModel semanticModel, ArgumentSyntax argument, IEnumerable<ParameterSyntax> parameters)
{
var symbolInfo = semanticModel.GetSymbolInfo(argument.Expression);
var symbol = symbolInfo.Symbol;
if (symbol == null)
{
return true;
}
if (symbol.Kind != SymbolKind.Field &&
symbol.Kind != SymbolKind.Parameter &&
symbol.Kind != SymbolKind.Local)
{
return false;
}
var field = symbol as IFieldSymbol;
if (field != null)
{
return !field.IsReadOnly;
}
return true;
}
private async Task<Document> UseDeclarationExpression(Document document, ArgumentSyntax argument, VariableDeclaratorSyntax declarator,
CancellationToken cancellationToken)
{
// get variable declaration
var declaration = declarator.Parent;
// get statement which contains both local declaration statement and method call with out argument
var statement = DiagnosticAnalyzer.GetContainingStatement(declaration.Parent);
// remove entire local declaration statement or just single variable declaration
// depending on how many variables are declared within single local declaration statement
var nodeToRemove = declaration.ChildNodes().OfType<VariableDeclaratorSyntax>().Count() > 1 ? declarator : declaration.Parent;
var newStatement = statement.RemoveNode(nodeToRemove, SyntaxRemoveOptions.KeepEndOfLine);
// get variable type
var type = declaration.ChildNodes().First() as TypeSyntax;
// create new Declaration Expression using variable type and declarator
var newDeclarationExpression = SyntaxFactory.DeclarationExpression(type, declarator);
// fix the trivia aroung Declaration Expression
var firstToken = newDeclarationExpression.GetFirstToken();
var leadingTrivia = firstToken.LeadingTrivia;
var trimmedDeclarationExpression = newDeclarationExpression.ReplaceToken(firstToken, firstToken.WithLeadingTrivia(SyntaxTriviaList.Empty));
// get ArgumentSyntax from newStatement which is equivalent to argument from original syntax tree
var newArgument = newStatement.DescendantNodes()
.FirstOrDefault(n => n.IsEquivalentTo(argument));
// replace argument with new version, containing Declaration Expression
newStatement = newStatement.ReplaceNode(newArgument.ChildNodes().First(), trimmedDeclarationExpression);
// get root for current document and replace statement with new version
var root = await document.GetSyntaxRootAsync(cancellationToken);
var newRoot = root.ReplaceNode(statement, newStatement);
// return document with modified syntax
return document.WithSyntaxRoot(newRoot);
}
public static IParameterSymbol GetParameterSymbol(ArgumentSyntax argument, ArgumentListSyntax argumentList, IMethodSymbol method)
{
if (!argumentList.Arguments.Contains(argument) ||
method == null)
{
return null;
}
if (argument.NameColon != null)
{
return method.Parameters
.FirstOrDefault(symbol => symbol.Name == argument.NameColon.Name.Identifier.ValueText);
}
var argumentIndex = argumentList.Arguments.IndexOf(argument);
var parameterIndex = argumentIndex;
if (parameterIndex >= method.Parameters.Length)
{
var p = method.Parameters.Last();
return p.IsParams ? p : null;
}
var parameter = method.Parameters[parameterIndex];
return parameter;
}
public static bool TryGetParameterSymbol(ArgumentSyntax argument, ArgumentListSyntax argumentList,
IMethodSymbol method, out IParameterSymbol parameter)
{
parameter = null;
if (!argumentList.Arguments.Contains(argument) ||
method == null ||
method.IsVararg)
{
return false;
}
if (argument.NameColon != null)
{
parameter = method.Parameters
.FirstOrDefault(symbol => symbol.Name == argument.NameColon.Name.Identifier.ValueText);
return parameter != null;
}
var argumentIndex = argumentList.Arguments.IndexOf(argument);
var parameterIndex = argumentIndex;
if (parameterIndex >= method.Parameters.Length)
{
var lastParameter = method.Parameters.Last();
parameter = lastParameter.IsParams ? lastParameter : null;
return parameter != null;
}
parameter = method.Parameters[parameterIndex];
return true;
}
private async Task<Document> FormatXmlAsync(Document document, ArgumentSyntax argSntax, CancellationToken cancellationToken)
{
var root = await document.GetSyntaxRootAsync(cancellationToken);
var tree = root.SyntaxTree;
//Get the character position of the ArgumentSyntax
FileLinePositionSpan position = tree.GetLineSpan(argSntax.Span);
int cSpace = position.StartLinePosition.Character;
//Get the parent VariableDeclaration to figure out the preceeding trivia since we can't
//get the column position from GetLineSpan (bug?)
var parent = argSntax.Ancestors().Where(t => t.IsKind(SyntaxKind.VariableDeclaration)).FirstOrDefault();
var parentTrivia = parent.GetLeadingTrivia().ToFullString();
var xml = argSntax.Expression.GetFirstToken().ValueText;
var newXml = FormatXml(xml);
//Process each line of the formatted XML and prepend the parent trivia & spaces
string[] xmlLines = newXml.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.None);
for (int i = 1; i < xmlLines.Length; i++)
{
xmlLines[i] = parentTrivia + new String(' ', (cSpace - 14)) + xmlLines[i];
}
newXml = String.Join("\r\n", xmlLines);
newXml = "@\"" + newXml + "\"";
var newNode = SyntaxFactory.Argument(null, SyntaxFactory.Token(SyntaxKind.None), SyntaxFactory.IdentifierName(newXml));
var newRoot = root.ReplaceNode(argSntax, newNode);
return document.WithSyntaxRoot(newRoot);
}
public override SyntaxNode VisitArgument(ArgumentSyntax node)
{
var invocationSyntax = node.Parent.Parent as InvocationExpressionSyntax;
if(invocationSyntax == null)
return base.VisitArgument(node);
var memberAccessExpressionSyntax = invocationSyntax.Expression as MemberAccessExpressionSyntax;
if(memberAccessExpressionSyntax == null)
return base.VisitArgument(node);
var methodNameSyntax = memberAccessExpressionSyntax.Name as SimpleNameSyntax;
var method = model.GetSymbolInfo(methodNameSyntax).Symbol as IMethodSymbol;
if(method == null)
return base.VisitArgument(node);
var argList = (ArgumentListSyntax)node.Parent;
//TODO check that parameter name preserved if specified, otherwise order can be broken
var argIndex = argList.Arguments.IndexOf(node);
var parameterSymbol = method.Parameters[argIndex]; //TODO when there is params argument in method index may be well out of range
var lambda = node.Expression as LambdaExpressionSyntax;
if(parameterSymbol.HasAttribute<MetaRewriteLambdaParamAttribute>(model.Compilation) && lambda != null) {
//TODO error if value is not lambda
return node.WithExpression(VisitLambdaExpression(lambda));
}
if(parameterSymbol.HasAttribute<MetaRewriteParamAttribute>(model.Compilation))
return node.WithExpression(SyntaxFactory.LiteralExpression(SyntaxKind.StringLiteralExpression, SyntaxFactory.Literal(node.Expression.ToFullString())));
return base.VisitArgument(node);
}
static InvocationExpressionSyntax CheckThat(INamedTypeSymbol nfluentCheck, ArgumentSyntax argument)
{
return InvocationExpression(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
nfluentCheck.ToNameSyntax(),
IdentifierName("That")),
ArgumentList(SingletonSeparatedList(argument)));
}
private static bool IsOrdinalOrOrdinalIgnoreCase(ArgumentSyntax argumentSyntax, SemanticModel model)
{
var argumentSymbol = model.GetSymbolInfo(argumentSyntax.Expression).Symbol;
if (argumentSymbol != null)
{
return IsOrdinalOrOrdinalIgnoreCase(argumentSymbol.Name);
}
return false;
}
public static string Argument(ArgumentSyntax arg)
{
var output = SyntaxNode(arg.Expression);
if (arg.NameColon != null)
{
output = SyntaxNode(arg.NameColon.Name) + ": " + output;
}
return output;
}
public AddOutOrRefCodeAction(
Document document,
SemanticModel semanticModel,
ArgumentSyntax argument,
IEnumerable<ParameterSyntax> parameters)
{
this.document = document;
this.semanticModel = semanticModel;
this.argument = argument;
this.parameters = parameters;
}
public override VisualBasicSyntaxNode VisitArgument(CSS.ArgumentSyntax node)
{
NameColonEqualsSyntax name = null;
if (node.NameColon != null)
{
name = SyntaxFactory.NameColonEquals((IdentifierNameSyntax)node.NameColon.Name.Accept(this));
}
var value = (ExpressionSyntax)node.Expression.Accept(this);
return(SyntaxFactory.SimpleArgument(name, value));
}
protected ITypeSymbol GetArgumentType(ArgumentSyntax syntax)
{
var symbol = this.semanticModel.GetSpeculativeSymbolInfo(syntax.Expression.SpanStart + this.displacement, syntax.Expression, SpeculativeBindingOption.BindAsExpression).Symbol;
var property = symbol?.GetType().GetProperty("Type");
if (property != null)
{
return property.GetValue(symbol) as ITypeSymbol;
}
return this.semanticModel.GetSpeculativeTypeInfo(syntax.Expression.SpanStart + this.displacement, syntax.Expression, SpeculativeBindingOption.BindAsExpression).Type;
}
/// <summary>
/// Lifts the expression represented by <paramref name="argument" />, if necessary.
/// </summary>
public override SyntaxNode VisitArgument(ArgumentSyntax argument)
{
if (argument.Parent.Parent is ElementAccessExpressionSyntax)
return base.VisitArgument(argument);
var requiresLifting = argument.HasAttribute<LiftExpressionAttribute>(SemanticModel);
argument = (ArgumentSyntax)base.VisitArgument(argument);
if (!requiresLifting)
return argument;
var expression = SyntaxBuilder.Lambda(Enumerable.Empty<ParameterSyntax>(), argument.Expression).WithTrivia(argument);
return argument.WithExpression(expression);
}
private bool IsPassedToDelegateCreationExpression(ArgumentSyntax argument, ITypeSymbol type)
{
if (type.IsDelegateType() &&
argument.IsParentKind(SyntaxKind.ArgumentList) &&
argument.Parent.IsParentKind(SyntaxKind.ObjectCreationExpression))
{
var objectCreationExpression = (ObjectCreationExpressionSyntax)argument.Parent.Parent;
var objectCreationType = _semanticModel.GetTypeInfo(objectCreationExpression).Type;
if (objectCreationType.Equals(type))
{
return true;
}
}
return false;
}
private Task<Document> ComputeRoot(
Document document, SyntaxNode root,
ArgumentSyntax argument, IMethodSymbol methodSymbol) {
var providenArgumentsList = argument.Parent as ArgumentListSyntax;
var providenArguments = providenArgumentsList.Arguments;
var argumentIndex = providenArguments.IndexOf(argument);
var newArguments = Enumerable.Concat(
providenArguments.Take(argumentIndex),
providenArguments.Skip(argumentIndex)
.Select((arg, index) => {
var parameterName = methodSymbol.Parameters[index].Name;
return arg
.WithNameColon(NameColon(IdentifierName(parameterName)))
.WithAdditionalAnnotations(Formatter.Annotation, Simplifier.Annotation);
}));
var newArgumentList = providenArgumentsList.WithArguments(SeparatedList(newArguments));
var newRoot = root.ReplaceNode(providenArgumentsList, newArgumentList);
return Task.FromResult(document.WithSyntaxRoot(newRoot));
}
private async Task<Document> DiagnosticSeverityError(Document document, ArgumentSyntax argument, CancellationToken c)
{
SyntaxGenerator generator = SyntaxGenerator.GetGenerator(document);
SyntaxNode expression = generator.IdentifierName("DiagnosticSeverity");
var newExpression = generator.MemberAccessExpression(expression, "Error") as ExpressionSyntax;
var rule = argument.FirstAncestorOrSelf<FieldDeclarationSyntax>();
var newRule = rule.ReplaceNode(argument.Expression, newExpression);
return await ReplaceNode(argument.FirstAncestorOrSelf<FieldDeclarationSyntax>(), newRule.WithTrailingTrivia(SyntaxFactory.TriviaList(SyntaxFactory.EndOfLine("\r\n"), SyntaxFactory.Whitespace(" "), SyntaxFactory.ParseTrailingTrivia("// defaultSeverity: Is set to DiagnosticSeverity.[severity] where severity can be Error, Warning, Hidden or Info, but can only be Error or Warning for the purposes of this tutorial").ElementAt(0), SyntaxFactory.EndOfLine("\r\n"))).WithLeadingTrivia(argument.FirstAncestorOrSelf<FieldDeclarationSyntax>().GetLeadingTrivia()), document);
}
public static glsl.ArgumentSyntax Translate(this cs.ArgumentSyntax node)
{
return(new glsl.ArgumentSyntax().Update(
node.Expression.Translate()
));
}
private async Task<Document> EnabledByDefaultAsync(Document document, ArgumentSyntax argument, CancellationToken c)
{
SyntaxGenerator generator = SyntaxGenerator.GetGenerator(document);
var rule = argument.FirstAncestorOrSelf<FieldDeclarationSyntax>();
var newRule = rule.ReplaceNode(argument.Expression, generator.LiteralExpression(true));
return await ReplaceNode(argument.FirstAncestorOrSelf<FieldDeclarationSyntax>(), newRule.WithTrailingTrivia(SyntaxFactory.TriviaList(SyntaxFactory.EndOfLine("\r\n"), SyntaxFactory.Whitespace(" "), SyntaxFactory.ParseTrailingTrivia("// isEnabledByDefault: Determines whether the analyzer is enabled by default or if the user must manually enable it. Generally set to true").ElementAt(0), SyntaxFactory.EndOfLine("\r\n"))).WithLeadingTrivia(argument.FirstAncestorOrSelf<FieldDeclarationSyntax>().GetLeadingTrivia()), document);
}
internal static FieldDeclarationSyntax CreateEmptyRule(SyntaxGenerator generator, string idName="Change me to the name of the above constant", string titleDefault="Enter a title for this diagnostic", string messageDefault="Enter a message to be displayed with this diagnostic",
string categoryDefault="Enter a category for this diagnostic (e.g. Formatting)", ExpressionSyntax severityDefault=null, ExpressionSyntax enabledDefault=null)
{
if (severityDefault == null)
{
severityDefault = generator.DefaultExpression(SyntaxFactory.ParseTypeName("DiagnosticSeverity")) as ExpressionSyntax;
}
if (enabledDefault == null)
{
enabledDefault = generator.DefaultExpression(generator.TypeExpression(SpecialType.System_Boolean)) as ExpressionSyntax;
}
var type = SyntaxFactory.ParseTypeName("DiagnosticDescriptor");
var arguments = new ArgumentSyntax[6];
var whitespace = " ";
var id = generator.LiteralExpression(idName);
var idArg = generator.Argument("id", RefKind.None, id).WithLeadingTrivia(SyntaxFactory.CarriageReturnLineFeed, SyntaxFactory.Whitespace(whitespace)) as ArgumentSyntax;
arguments[0] = idArg;
var title = generator.LiteralExpression(titleDefault);
var titleArg = generator.Argument("title", RefKind.None, title).WithLeadingTrivia(SyntaxFactory.Whitespace(whitespace)) as ArgumentSyntax;
arguments[1] = titleArg;
var message = generator.LiteralExpression(messageDefault);
var messageArg = generator.Argument("messageFormat", RefKind.None, message).WithLeadingTrivia(SyntaxFactory.Whitespace(whitespace)) as ArgumentSyntax;
arguments[2] = messageArg;
var category = generator.LiteralExpression(categoryDefault);
var categoryArg = generator.Argument("category", RefKind.None, category).WithLeadingTrivia(SyntaxFactory.Whitespace(whitespace)) as ArgumentSyntax;
arguments[3] = categoryArg;
var defaultSeverityArg = generator.Argument("defaultSeverity", RefKind.None, severityDefault).WithLeadingTrivia(SyntaxFactory.Whitespace(whitespace)) as ArgumentSyntax;
arguments[4] = defaultSeverityArg;
var enabledArg = generator.Argument("isEnabledByDefault", RefKind.None, enabledDefault).WithLeadingTrivia(SyntaxFactory.Whitespace(whitespace)) as ArgumentSyntax;
arguments[5] = enabledArg;
var identifier = SyntaxFactory.ParseToken("spacingRule");
var separators = new List<SyntaxToken>();
var separator = SyntaxFactory.ParseToken(",").WithTrailingTrivia(SyntaxFactory.CarriageReturnLineFeed);
separators.Add(separator);
separators.Add(separator);
separators.Add(separator);
separators.Add(separator);
separators.Add(separator);
var argumentsNewLines = SyntaxFactory.SeparatedList(arguments, separators);
var argumentList = SyntaxFactory.ArgumentList(argumentsNewLines);
var value = SyntaxFactory.ObjectCreationExpression(type, argumentList, null);
var initializer = SyntaxFactory.EqualsValueClause(value);
var variables = new SeparatedSyntaxList<VariableDeclaratorSyntax>();
var variable = SyntaxFactory.VariableDeclarator(identifier, null, initializer);
variables = variables.Add(variable);
var declaration = SyntaxFactory.VariableDeclaration(type.WithTrailingTrivia(SyntaxFactory.Whitespace(" ")), variables);
var modifiers = SyntaxFactory.TokenList(SyntaxFactory.ParseToken("internal").WithTrailingTrivia(SyntaxFactory.Whitespace(" ")), SyntaxFactory.ParseToken("static").WithTrailingTrivia(SyntaxFactory.Whitespace(" ")));
var rule = SyntaxFactory.FieldDeclaration(new SyntaxList<AttributeListSyntax>(), modifiers, declaration);
return rule;
}
public override object ExtractArgumentValue(CSharpSyntax.ArgumentSyntax argumentSyntax) => Compiler.SemanticModel.GetConstantValue(argumentSyntax.Expression).Value;
public override SyntaxNode VisitArgument(ArgumentSyntax node)
{
_cancellationToken.ThrowIfCancellationRequested();
var newArgument = (ArgumentSyntax)base.VisitArgument(node);
var argumentType = _semanticModel.GetTypeInfo(node.Expression).ConvertedType;
if (argumentType != null &&
!IsPassedToDelegateCreationExpression(node, argumentType))
{
ExpressionSyntax newArgumentExpressionWithCast;
if (TryCastTo(argumentType, node.Expression, newArgument.Expression, out newArgumentExpressionWithCast))
{
return newArgument.WithExpression(newArgumentExpressionWithCast);
}
}
return newArgument;
}
static SyntaxNode GetArgumentValue(ArgumentSyntax argument)
{
return argument.Expression;
}
public ArgumentParameterMapping(ArgumentSyntax argument, IParameterSymbol parameter)
{
Argument = argument;
Parameter = parameter;
}
private IEnumerable<ITypeSymbol> InferTypeInArgument(int index, IEnumerable<IMethodSymbol> methods, ArgumentSyntax argumentOpt)
{
return InferTypeInArgument(index, methods.Select(m => m.Parameters), argumentOpt);
}
static string FormatArgument(ArgumentSyntax argument)
{
return string.Format(@"new Nake.TaskArgument(""{0}"", {1})",
GetArgumentName(argument), GetArgumentValue(argument));
}
private static InvocationExpressionSyntax GetIsInstanceOfTypeCall(InvocationExpressionSyntax invocation,
ExpressionSyntax typeInstance, ArgumentSyntax getTypeCallInArgument)
{
return SyntaxFactory.InvocationExpression(
SyntaxFactory.MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
typeInstance,
SyntaxFactory.IdentifierName("IsInstanceOfType")).WithTriviaFrom(invocation.Expression),
SyntaxFactory.ArgumentList(
SyntaxFactory.SeparatedList(new[]
{
SyntaxFactory.Argument(
GetExpressionFromGetType(getTypeCallInArgument.Expression)).WithTriviaFrom(getTypeCallInArgument)
}))
.WithTriviaFrom(invocation.ArgumentList))
.WithTriviaFrom(invocation);
}
private IEnumerable<ITypeSymbol> InferTypeInArgument(
int index,
IEnumerable<ImmutableArray<IParameterSymbol>> parameterizedSymbols,
ArgumentSyntax argumentOpt)
{
var name = argumentOpt != null && argumentOpt.NameColon != null ? argumentOpt.NameColon.Name.Identifier.ValueText : null;
return InferTypeInArgument(index, parameterizedSymbols, name);
}
static string GetArgumentName(ArgumentSyntax argument)
{
return argument.NameColon != null
? argument.NameColon.Name.Identifier.ValueText
: "";
}
public override void VisitArgument(ArgumentSyntax node)
{
base.VisitArgument(node);
if (!node.RefOrOutKeyword.IsKind(SyntaxKind.None))
{
CheckForFieldWrite(node.Expression);
}
}
private bool IsAccessed(
SemanticModel semanticModel,
ISymbol outSymbol,
BlockSyntax enclosingBlockOfLocalStatement,
LocalDeclarationStatementSyntax localStatement,
ArgumentSyntax argumentNode,
CancellationToken cancellationToken)
{
var localStatementStart = localStatement.Span.Start;
var argumentNodeStart = argumentNode.Span.Start;
var variableName = outSymbol.Name;
// Walk the block that the local is declared in looking for accesses.
// We can ignore anything prior to the actual local declaration point,
// and we only need to check up until we reach the out-argument.
foreach (var descendentNode in enclosingBlockOfLocalStatement.DescendantNodes())
{
var descendentStart = descendentNode.Span.Start;
if (descendentStart <= localStatementStart)
{
// This node is before the local declaration. Can ignore it entirely as it could
// not be an access to the local.
continue;
}
if (descendentStart >= argumentNodeStart)
{
// We reached the out-var. We can stop searching entirely.
break;
}
if (descendentNode.IsKind(SyntaxKind.IdentifierName))
{
// See if this looks like an accessor to the local variable syntactically.
var identifierName = (IdentifierNameSyntax)descendentNode;
if (identifierName.Identifier.ValueText == variableName)
{
// Confirm that it is a access of the local.
var symbol = semanticModel.GetSymbolInfo(identifierName, cancellationToken).Symbol;
if (outSymbol.Equals(symbol))
{
// We definitely accessed the local before the out-argument. We
// can't inline this local.
return true;
}
}
}
}
// No accesses detected
return false;
}
public override SyntaxNode VisitArgument(ArgumentSyntax node)
{
_cancellationToken.ThrowIfCancellationRequested();
var newArgument = (ArgumentSyntax)base.VisitArgument(node);
var argumentType = _semanticModel.GetTypeInfo(node.Expression).ConvertedType;
if (argumentType != null &&
!IsPassedToDelegateCreationExpression(node, argumentType))
{
var specAnalyzer = new SpeculationAnalyzer(node.Expression, newArgument.Expression, _semanticModel, _cancellationToken);
var speculativeSemanticModel = specAnalyzer.SpeculativeSemanticModel;
var speculatedExpession = specAnalyzer.ReplacedExpression;
bool wasCastAdded;
var newArgumentExpression = speculatedExpession.CastIfPossible(argumentType, speculatedExpession.SpanStart, speculativeSemanticModel, out wasCastAdded);
if (wasCastAdded)
{
return newArgument.WithExpression(newArgumentExpression);
}
}
return newArgument;
}
/// <summary>
/// Given an argument node, tries to generate an appropriate name that can be used for that
/// argument.
/// </summary>
public static string GenerateNameForArgument(
this SemanticModel semanticModel, ArgumentSyntax argument)
{
// If it named argument then we use the name provided.
if (argument.NameColon != null)
{
return argument.NameColon.Name.Identifier.ValueText;
}
return semanticModel.GenerateNameForExpression(argument.Expression);
}
private bool TryGenerateArgument(ArgumentSyntax argument)
{
using (ArgumentTag())
{
return TryGenerateExpression(argument.Expression);
}
}