public static bool Look(SyntaxNode node)
{
if (node == null)
{
throw new ArgumentNullException(nameof(node));
}
var finder = new ContractCSharpMethodCallFinder();
finder.Visit(node);
return(finder.found);
}
private bool VisitInvocationExpression(InvocationExpressionSyntax node, out StatementSyntax replacementSyntax)
{
replacementSyntax = null;
var assessExpression = node.Expression as MemberAccessExpressionSyntax;
var contractTypeRef = assessExpression?.Expression as IdentifierNameSyntax;
var contractMethodRef = assessExpression?.Name.Identifier.ValueText ?? "";
var contractMethodTypeParams = (assessExpression?.Name as GenericNameSyntax)?.TypeArgumentList.Arguments.ToList();
if (contractTypeRef?.Identifier.ValueText != "Contract" || ContractRemover.ContractMethods.Contains(contractMethodRef) == false)
{
return(false);
}
var methodParamNames = new List <string>();
var methodDecl = node.FirstAncestorOrSelf <BaseMethodDeclarationSyntax>();
var propDecl = node.FirstAncestorOrSelf <PropertyDeclarationSyntax>();
var indexDecl = node.FirstAncestorOrSelf <IndexerDeclarationSyntax>();
var eventDecl = node.FirstAncestorOrSelf <EventDeclarationSyntax>();
if (methodDecl != null)
{
methodParamNames.AddRange(methodDecl.ParameterList.Parameters.Select(p => p.Identifier.ValueText).ToList());
}
else if (propDecl != null || eventDecl != null)
{
methodParamNames.Add("value");
}
else if (indexDecl != null)
{
methodParamNames.AddRange(indexDecl.ParameterList.Parameters.Select(p => p.Identifier.ValueText).ToList());
methodParamNames.Add("value");
}
else
{
return(false);
}
if (this.mode == ContractReplacementMode.Convert && contractMethodRef == "Requires")
{
var nsPrefix = this.HasNamespace("System", node.SyntaxTree) ? "" : "System.";
var checkExpression = node.ArgumentList.Arguments[0].Expression;
var exceptionType = contractMethodTypeParams?.FirstOrDefault() ??
(
IsArgumentNullCheck(checkExpression, methodParamNames) ? SyntaxFactory.ParseTypeName(nsPrefix + "ArgumentNullException") :
IsRangeCheck(checkExpression, methodParamNames) ? SyntaxFactory.ParseTypeName(nsPrefix + "ArgumentOutOfRangeException") :
SyntaxFactory.ParseTypeName(nsPrefix + "ArgumentException")
);
var paramRef = (
from n in checkExpression.DescendantNodes()
let idSyntax = n as IdentifierNameSyntax
let id = idSyntax?.Identifier.ValueText
where id != null && methodParamNames.Contains(id)
select id
).FirstOrDefault() ?? "";
if (ContractCSharpMethodCallFinder.Look(checkExpression))
{
return(true); // replace with null
}
replacementSyntax = SyntaxFactory.IfStatement(
condition: InverseExpression(checkExpression),
statement: SyntaxFactory.Block(
SyntaxFactory.ThrowStatement(
SyntaxFactory.ObjectCreationExpression(
type: exceptionType,
argumentList: SyntaxFactory.ArgumentList(
new SeparatedSyntaxList <ArgumentSyntax>()
.Add(SyntaxFactory.Argument(SyntaxFactory.LiteralExpression(SyntaxKind.StringLiteralExpression, SyntaxFactory.Literal(paramRef))))
.Add(SyntaxFactory.Argument(SyntaxFactory.LiteralExpression(SyntaxKind.StringLiteralExpression, SyntaxFactory.Literal(checkExpression.ToString()))))
),
initializer: null
)
)
)
).NormalizeWhitespace(eol: " ", indentation: " ").WithTriviaFrom(node.Parent);
}
else if (this.mode == ContractReplacementMode.Convert && (contractMethodRef == "Assert" || contractMethodRef == "Assume"))
{
var nsPrefix = this.HasNamespace("System.Diagnostics", node.SyntaxTree) ? "" : "System.Diagnostics.";
var checkExpression = node.ArgumentList.Arguments[0].Expression;
var messageExpression = node.ArgumentList.Arguments.ElementAtOrDefault(1)?.Expression;
replacementSyntax = SyntaxFactory.ExpressionStatement(
SyntaxFactory.InvocationExpression(
expression: SyntaxFactory.MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, SyntaxFactory.ParseTypeName(nsPrefix + "Debug"), SyntaxFactory.IdentifierName("Assert")),
argumentList: SyntaxFactory.ArgumentList(
new SeparatedSyntaxList <ArgumentSyntax>()
.Add(SyntaxFactory.Argument(checkExpression))
.Add(SyntaxFactory.Argument(messageExpression ?? SyntaxFactory.LiteralExpression(SyntaxKind.StringLiteralExpression, SyntaxFactory.Literal(checkExpression.ToString()))))
)
)
).NormalizeWhitespace(eol: string.Empty, indentation: " ").WithTriviaFrom(node.Parent);
}
return(true);
}
private bool VisitInvocationExpression(InvocationExpressionSyntax node, out StatementSyntax replacementSyntax)
{
replacementSyntax = null;
var assessExpression = node.Expression as MemberAccessExpressionSyntax;
var contractTypeRef = assessExpression?.Expression as IdentifierNameSyntax;
var contractMethodRef = assessExpression?.Name.Identifier.ValueText ?? "";
var contractMethodTypeParams = (assessExpression?.Name as GenericNameSyntax)?.TypeArgumentList.Arguments.ToList();
if (contractTypeRef?.Identifier.ValueText != "Contract" || ContractRemover.ContractMethods.Contains(contractMethodRef) == false)
{
return(false);
}
var methodParamNames = new List <string>();
var methodDecl = node.FirstAncestorOrSelf <BaseMethodDeclarationSyntax>();
var propDecl = node.FirstAncestorOrSelf <PropertyDeclarationSyntax>();
var indexDecl = node.FirstAncestorOrSelf <IndexerDeclarationSyntax>();
var eventDecl = node.FirstAncestorOrSelf <EventDeclarationSyntax>();
if (methodDecl != null)
{
methodParamNames.AddRange(methodDecl.ParameterList.Parameters.Select(p => p.Identifier.ValueText).ToList());
}
else if (propDecl != null || eventDecl != null)
{
methodParamNames.Add("value");
}
else if (indexDecl != null)
{
methodParamNames.AddRange(indexDecl.ParameterList.Parameters.Select(p => p.Identifier.ValueText).ToList());
methodParamNames.Add("value");
}
else
{
return(false);
}
if (this.mode == ContractReplacementMode.Convert && (contractMethodRef == "Assert" || contractMethodRef == "Assume" || contractMethodRef == "Requires"))
{
var nsPrefix = this.HasNamespace("System", node.SyntaxTree) ? "" : "System.";
var checkExpression = node.ArgumentList.Arguments[0].Expression;
var errorMessageExpression = node.ArgumentList.Arguments.Count > 1 ? node.ArgumentList.Arguments[1].Expression : null;
var exceptionType = contractMethodTypeParams?.FirstOrDefault() ??
(
IsArgumentNullCheck(checkExpression, methodParamNames) ? ParseTypeName(nsPrefix + "ArgumentNullException") :
IsRangeCheck(checkExpression, methodParamNames) ? ParseTypeName(nsPrefix + "ArgumentOutOfRangeException") :
ParseTypeName(nsPrefix + "ArgumentException")
);
var paramRef = checkExpression.DescendantNodes().OfType <IdentifierNameSyntax>()
.Where(ids => methodParamNames.Contains(ids.Identifier.ValueText))
.FirstOrDefault();
var paramNameRef = paramRef != null
? (ExpressionSyntax)InvocationExpression(IdentifierName("nameof"))
.WithArgumentList(ArgumentList(SingletonSeparatedList(Argument(paramRef))))
: LiteralExpression(SyntaxKind.StringLiteralExpression, Literal("value"));
if (ContractCSharpMethodCallFinder.Look(checkExpression))
{
return(true); // replace with null
}
var replacementParams = new ExpressionSyntax[] {
paramNameRef,
errorMessageExpression ?? LiteralExpression(SyntaxKind.StringLiteralExpression, Literal("Contract assertion not met: " + checkExpression.ToString()))
};
if (exceptionType.ToString().EndsWith(".ArgumentException", StringComparison.Ordinal) ||
exceptionType.ToString().Equals("ArgumentException", StringComparison.Ordinal))
{
Array.Reverse(replacementParams); // ArgumentException has reverse params order
}
// this includes comments
var firstbaseWhitespace = node.Parent.GetLeadingTrivia();
// this is exclusively indention
var baseWhitespace = TriviaList(firstbaseWhitespace.Reverse().TakeWhile(stt => stt.IsKind(SyntaxKind.WhitespaceTrivia)).Reverse());
var indentedWhitespace = baseWhitespace.Add(Whitespace(" "));
var endOfLineTrivia = node.Parent.GetTrailingTrivia();
var spaceList = TriviaList(Space);
replacementSyntax = IfStatement(
condition: InverseExpression(checkExpression),
statement: Block(
ThrowStatement(
ObjectCreationExpression(
type: exceptionType,
argumentList: ArgumentList(
new SeparatedSyntaxList <ArgumentSyntax>()
.Add(Argument(replacementParams[0]))
.Add(Argument(replacementParams[1]))
),
initializer: null
).NormalizeWhitespace()
)
.WithThrowKeyword(Token(indentedWhitespace, SyntaxKind.ThrowKeyword, spaceList))
.WithSemicolonToken(Token(TriviaList(), SyntaxKind.SemicolonToken, endOfLineTrivia))
)
.WithOpenBraceToken(Token(baseWhitespace, SyntaxKind.OpenBraceToken, endOfLineTrivia))
.WithCloseBraceToken(Token(baseWhitespace, SyntaxKind.CloseBraceToken, endOfLineTrivia))
)
.WithIfKeyword(Token(firstbaseWhitespace, SyntaxKind.IfKeyword, spaceList))
.WithCloseParenToken(Token(TriviaList(), SyntaxKind.CloseParenToken, endOfLineTrivia));
}
//else if (this.mode == ContractReplacementMode.Convert && (contractMethodRef == "Assert" || contractMethodRef == "Assume"))
//{
// var nsPrefix = this.HasNamespace("System.Diagnostics", node.SyntaxTree) ? "" : "System.Diagnostics.";
// var checkExpression = node.ArgumentList.Arguments[0].Expression;
// var messageExpression = node.ArgumentList.Arguments.ElementAtOrDefault(1)?.Expression;
// replacementSyntax = SyntaxFactory.ExpressionStatement(
// SyntaxFactory.InvocationExpression(
// expression: SyntaxFactory.MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, SyntaxFactory.ParseTypeName(nsPrefix + "Debug"), SyntaxFactory.IdentifierName("Assert")),
// argumentList: SyntaxFactory.ArgumentList(
// new SeparatedSyntaxList<ArgumentSyntax>()
// .Add(SyntaxFactory.Argument(checkExpression))
// .Add(SyntaxFactory.Argument(messageExpression ?? SyntaxFactory.LiteralExpression(SyntaxKind.StringLiteralExpression, SyntaxFactory.Literal(checkExpression.ToString()))))
// )
// )
// ).NormalizeWhitespace(eol: string.Empty, indentation: " ").WithTriviaFrom(node.Parent);
//}
return(true);
}