internal ContractEnsures(ICSharpStatement statement, PredicateExpression predicateExpression, Message message)
: base(statement, predicateExpression, message)
{
_contractResultArgument =
predicateExpression.Predicates.Select(p => p.Argument)
.OfType<ContractResultPredicateArgument>()
.FirstOrDefault();
}
private IfThrowPrecondition(IIfStatement ifStatement,
PredicateExpression predicateExpression, Message message, IClrTypeName exceptionTypeName)
: base(ifStatement, predicateExpression, message)
{
Contract.Requires(ifStatement != null);
Contract.Requires(exceptionTypeName != null);
_ifStatement = ifStatement;
_exceptionTypeName = exceptionTypeName;
}
protected ContractStatement(ICSharpStatement statement, PredicateExpression predicateExpression, Message message)
{
Contract.Requires(statement != null);
Contract.Requires(predicateExpression != null);
Contract.Requires(message != null);
_statement = statement;
_predicateExpression = predicateExpression;
_message = message;
}
internal static CodeContractAssertion FromInvocationExpression(IInvocationExpression invocationExpression)
{
Contract.Requires(invocationExpression != null);
var statement = invocationExpression.GetContainingStatement();
Contract.Assert(statement != null);
ContractAssertionType?assertionType = GetContractAssertionType(invocationExpression);
if (assertionType == null)
{
return(null);
}
Contract.Assert(invocationExpression.Arguments.Count != 0, "Invocation expression should have at least one argument!");
IExpression originalPredicateExpression = invocationExpression.Arguments[0].Expression;
var predicateExpression = PredicateExpression.Create(originalPredicateExpression);
var message = ExtractMessage(invocationExpression);
// TODO: switch to dictionary of factory methods?
switch (assertionType.Value)
{
case ContractAssertionType.Requires:
return(new ContractRequires(statement, invocationExpression,
predicateExpression, message));
case ContractAssertionType.Ensures:
return(new ContractEnsures(statement, predicateExpression, message));
case ContractAssertionType.Invariant:
return(new ContractInvariant(statement, predicateExpression, message));
case ContractAssertionType.Assert:
return(new ContractAssert(statement, predicateExpression, message));
case ContractAssertionType.Assume:
return(new ContractAssume(statement, predicateExpression, message));
default:
Contract.Assert(false, "Unknown assertion type: " + assertionType.Value);
return(null);
}
}
internal static IfThrowPrecondition TryCreate(ICSharpStatement statement)
{
Contract.Requires(statement != null);
var ifStatement = statement as IIfStatement;
if (ifStatement == null || ifStatement.Condition == null)
{
return(null);
}
var predicateExpression = PredicateExpression.Create(ifStatement.Condition);
IThrowStatement throwStatement = ParseThrowStatement(ifStatement);
if (throwStatement == null)
{
return(null);
}
var arguments = throwStatement.GetArguments().ToList();
var exceptionType = throwStatement.GetExceptionType();
if (exceptionType == null)
{
return(null);
}
// We can deal with any exception derived from the ArgumentException
if (!IsDerivedOrEqualFor(exceptionType, typeof(ArgumentException)) ||
arguments.Count == 0)
{
return(null);
}
var message =
arguments.Skip(1).FirstOrDefault()
.Return(ExtractMessage, NoMessage.Instance); // message is optional and should be second argument
return(new IfThrowPrecondition(ifStatement, predicateExpression, message, exceptionType));
}
internal ContractRequires(ICSharpStatement statement, IInvocationExpression invocationExpression,
PredicateExpression predicateExpression, Message message)
: base(statement, predicateExpression, message)
{
GenericArgumentDeclaredType = GetGenericRequiresType(invocationExpression);
}
internal ContractInvariant(ICSharpStatement statement, PredicateExpression predicateExpression, Message message)
: base(statement, predicateExpression, message)
{
}
internal ContractInvariant(ICSharpStatement statement, PredicateExpression predicateExpression, Message message)
: base(statement, predicateExpression, message)
{}
internal ContractRequires(ICSharpStatement statement, IInvocationExpression invocationExpression,
PredicateExpression predicateExpression, Message message)
: base(statement, predicateExpression, message)
{
GenericArgumentDeclaredType = GetGenericRequiresType(invocationExpression);
}
public PreconditionValidator(ICSharpStatement statement,
PredicateExpression predicateExpression, Message message) : base(statement, predicateExpression, message)
{}
public PreconditionValidator(ICSharpStatement statement,
PredicateExpression predicateExpression, Message message) : base(statement, predicateExpression, message)
{
}
protected CodeContractAssertion(ICSharpStatement statement,
PredicateExpression predicateExpression, Message message)
: base(statement, predicateExpression, message)
{}
protected CodeContractAssertion(ICSharpStatement statement,
PredicateExpression predicateExpression, Message message)
: base(statement, predicateExpression, message)
{
}