private static IEnumerable <ValidationRule> GetValidationRules()
{
yield return(ValidationRule.CheckStatement(
s =>
{
// void-return methods are prohibited by CC compiler
if (IsVoidReturnMethod(s))
{
return ValidationResult.CreateError(s, MalformedContractError.VoidReturnMethodCall);
}
return ValidationResult.CreateNoError(s);
}));
yield return(ValidationRule.CheckStatement(
s =>
{
// Non-void return methods lead to warning from the compiler
if (IsNonVoidReturnMethod(s))
{
return ValidationResult.CreateWarning(s, MalformedContractWarning.NonVoidReturnMethodCall);
}
return ValidationResult.CreateNoError(s);
}));
yield return(ValidationRule.CheckStatement(
s =>
{
// Assignments are forbidden in contract block
if (IsAssignmentStatement(s))
{
return ValidationResult.CreateError(s, MalformedContractError.AssignmentInContractBlock);
}
return ValidationResult.CreateNoError(s);
}));
yield return(ValidationRule.CheckCodeContractStatement(
s =>
{
// Assert/Assume are forbidden in contract block
if ((s.StatementType == CodeContractStatementType.Assert ||
s.StatementType == CodeContractStatementType.Assume))
{
return ValidationResult.CreateError(s.Statement, MalformedContractError.AssertOrAssumeInContractBlock);
}
return ValidationResult.CreateNoError(s.Statement);
}));
yield return(ValidationRule.CheckContractBlock(
(currentStatement, contractBlock) =>
{
// Ensures/Ensures on throw should not be before requires
if (currentStatement.IsPostcondition && HasPreconditionAfterCurrentStatement(contractBlock, currentStatement))
{
return ValidationResult.CreateError(currentStatement.Statement,
MalformedContractError.RequiresAfterEnsures);
}
return ValidationResult.CreateNoError(currentStatement.Statement);
}));
yield return(ValidationRule.CheckContractBlock(
(currentStatement, contractBlock) =>
{
// Ensures/Ensures on throw should not be before requires
if (currentStatement.IsPrecondition && HasPostconditionsBeforeCurentStatement(contractBlock, currentStatement))
{
return ValidationResult.CreateError(currentStatement.Statement,
MalformedContractError.RequiresAfterEnsures);
}
return ValidationResult.CreateNoError(currentStatement.Statement);
}));
yield return(ValidationRule.CheckContractBlock(
(currentStatement, contractBlock) =>
{
// Ensures/Ensures on throw should not be before requires
if ((currentStatement.IsPrecondition ||
currentStatement.IsPostcondition) &&
HasEndContractBlockBeforeCurrentStatement(contractBlock, currentStatement))
{
return ValidationResult.CreateError(currentStatement.Statement,
MalformedContractError.ReqruiesOrEnsuresAfterEndContractBlock);
}
return ValidationResult.CreateNoError(currentStatement.Statement);
}));
yield return(ValidationRule.CheckContractBlock(
(currentStatement, contractBlock) =>
{
// EndContractBlock should be only one!
if (currentStatement.IsEndContractBlock && HasEndContractBlockBeforeCurrentStatement(contractBlock, currentStatement))
{
return ValidationResult.CreateError(currentStatement.Statement,
MalformedContractError.DuplicatedEndContractBlock);
}
return ValidationResult.CreateNoError(currentStatement.Statement);
}));
}
public static IEnumerable <ValidationRule> GetValidationRules()
{
yield return(ValidationRule.CheckCodeContractStatement(
CheckCompatibilityOfContractResultWithMethodReturnType));
}