/// <summary>
/// Performs the semantic analysis of the statement
/// </summary>
/// <param name="instance">the reference instance on which this element should analysed</param>
/// <returns>True if semantic analysis should be continued</returns>
public override bool SemanticAnalysis(Utils.INamable instance)
{
bool retVal = base.SemanticAnalysis(instance);
if (retVal)
{
ListExpression.SemanticAnalysis(instance);
Types.Collection collectionType = ListExpression.GetExpressionType() as Types.Collection;
if (collectionType != null)
{
IteratorVariable.Type = collectionType.Type;
}
Value.SemanticAnalysis(instance);
Types.Type valueType = Value.GetExpressionType();
if (valueType != null)
{
if (!valueType.Match(collectionType.Type))
{
AddError("Type of " + Value + " does not match collection type " + collectionType);
}
}
else
{
AddError("Cannot determine type of " + Value);
}
if (Condition != null)
{
Condition.SemanticAnalysis(instance);
}
}
return(retVal);
}
/// <summary>
/// Checks the statement for semantical errors
/// </summary>
public override void CheckStatement()
{
Types.Type targetType = VariableIdentification.GetExpressionType();
if (targetType == null)
{
Root.AddError("Cannot determine type of target " + VariableIdentification.ToString());
}
else if (Expression != null)
{
Expression.checkExpression();
Types.Type type = Expression.GetExpressionType();
if (type != null)
{
if (targetType != null)
{
if (!targetType.Match(type))
{
UnaryExpression unaryExpression = Expression as UnaryExpression;
if (unaryExpression != null && unaryExpression.Term.LiteralValue != null)
{
if (targetType.getValue(unaryExpression.ToString()) == null)
{
Root.AddError("Expression " + Expression.ToString() + " does not fit in variable " + VariableIdentification.ToString());
}
}
else
{
Root.AddError("Expression [" + Expression.ToString() + "] type (" + type.FullName + ") does not match variable [" + VariableIdentification.ToString() + "] type (" + targetType.FullName + ")");
}
}
}
else
{
Root.AddError("Cannot determine variable type");
}
}
else
{
Root.AddError("Cannot determine expression type (3) for " + Expression.ToString());
}
}
else
{
Root.AddError("Invalid expression in assignment");
}
}
/// <summary>
/// Provides the type of this expression
/// </summary>
/// <returns></returns>
public override Types.Type GetExpressionType()
{
Types.Type retVal = null;
Types.Type leftType = Left.GetExpressionType();
if (leftType == null)
{
AddError("Cannot determine expression type (1) for " + Left.ToString());
}
else
{
Types.Type rightType = Right.GetExpressionType();
if (rightType == null)
{
AddError("Cannot determine expression type (2) for " + Right.ToString());
}
else
{
switch (Operation)
{
case OPERATOR.EXP:
case OPERATOR.MULT:
case OPERATOR.DIV:
case OPERATOR.ADD:
case OPERATOR.SUB:
if (leftType.Match(rightType))
{
if (leftType is Types.IntegerType || leftType is Types.DoubleType)
{
retVal = rightType;
}
else
{
retVal = leftType;
}
}
else
{
retVal = leftType.CombineType(rightType, Operation);
}
break;
case OPERATOR.AND:
case OPERATOR.OR:
if (leftType == EFSSystem.BoolType && rightType == EFSSystem.BoolType)
{
retVal = EFSSystem.BoolType;
}
break;
case OPERATOR.EQUAL:
case OPERATOR.NOT_EQUAL:
case OPERATOR.LESS:
case OPERATOR.LESS_OR_EQUAL:
case OPERATOR.GREATER:
case OPERATOR.GREATER_OR_EQUAL:
if (leftType.Match(rightType) || rightType.Match(leftType))
{
retVal = EFSSystem.BoolType;
}
break;
case OPERATOR.IN:
case OPERATOR.NOT_IN:
Types.Collection collection = rightType as Types.Collection;
if (collection != null)
{
if (collection.Type == null)
{
retVal = EFSSystem.BoolType;
}
else if (collection.Type == leftType)
{
retVal = EFSSystem.BoolType;
}
}
else
{
Types.StateMachine stateMachine = rightType as Types.StateMachine;
if (stateMachine != null && leftType.Match(stateMachine))
{
retVal = EFSSystem.BoolType;
}
}
break;
case OPERATOR.UNDEF:
break;
}
}
}
return(retVal);
}
public override ICallable getStaticCallable()
{
if (__staticCallable == null)
{
ICallable left = Left.getStaticCallable();
if (left != null)
{
ICallable right = Right.getStaticCallable();
if (right != null)
{
if (left.FormalParameters.Count == right.FormalParameters.Count)
{
bool match = true;
for (int i = 0; i < left.FormalParameters.Count; i++)
{
Types.Type leftType = ((Parameter)left.FormalParameters[i]).Type;
Types.Type rightType = ((Parameter)right.FormalParameters[i]).Type;
if (!leftType.Equals(rightType))
{
AddError("Non matching formal parameter type for parameter " + i + " " + leftType + " vs " + rightType);
match = false;
}
}
if (left.ReturnType != right.ReturnType)
{
AddError("Non matching return types " + left.ReturnType + " vs " + right.ReturnType);
match = false;
}
if (match)
{
// Create a dummy funciton for type analysis
Function function = (Function)Generated.acceptor.getFactory().createFunction();
function.Name = ToString();
function.ReturnType = left.ReturnType;
foreach (Parameter param in left.FormalParameters)
{
Parameter parameter = (Parameter)Generated.acceptor.getFactory().createParameter();
parameter.Name = param.Name;
parameter.Type = param.Type;
parameter.Enclosing = function;
function.appendParameters(parameter);
}
function.Enclosing = Root;
__staticCallable = function;
}
}
else
{
AddError("Invalid number of parameters, " + Left + " and " + Right + " should have the same number of parameters");
}
}
else
{
// Left is not null, but right is.
// Ensure that right type corresponds to left return type
// and return left
Types.Type rightType = Right.GetExpressionType();
if (rightType.Match(left.ReturnType))
{
__staticCallable = left;
}
else
{
AddError(Left + "(" + left.ReturnType + " ) does not correspond to " + Right + "(" + rightType + ")");
}
}
}
else
{
ICallable right = Right.getStaticCallable();
if (right != null)
{
// Right is not null, but left is.
// Ensure that left type corresponds to right return type
// and return right
Types.Type leftType = Left.GetExpressionType();
if ((leftType.Match(right.ReturnType)))
{
__staticCallable = right;
}
else
{
AddError(Left + "(" + leftType + ") does not correspond to " + Right + "(" + right.ReturnType + ")");
}
}
}
}
return(__staticCallable);
}