protected ExpressionResult Assign(InstructionContext context, ExpressionResult result)
{
var left = Left as IdentifierExpression;
if (left == null)
{
throw new ExpressionEvaluationException(this, "only identifiers can be assigned");
}
var store = context.GetStore(left.Variable);
if (store != null)
{
switch (result.Type)
{
case ExpressionResultType.Boolean:
store.ChangeOrAdd(left.Variable.Name, result.Boolean);
break;
case ExpressionResultType.Integer:
store.ChangeOrAdd(left.Variable.Name, result.Integer);
break;
case ExpressionResultType.Number:
store.ChangeOrAdd(left.Variable.Name, result.Number);
break;
}
}
else
{
throw new ExpressionEvaluationException(this, string.Format("unable to assign to variable {0}", left.Variable.Name));
}
return(result);
}
