private void CheckMultipleVariableExpression(MultipleVariableExpression e, TypeCheckingContext context)
{
List <Type> elementTypes = new List <Type>();
int index = 0;
foreach (string variable in e.Variables)
{
Type elementType = context.RightOperandType.GenericTypeArguments[index];
elementTypes.Add(elementType);
context.VariableContext.Set(variable, context.CreateAutoCreatedVariableValue(elementType));
index++;
if (index > context.RightOperandType.GenericTypeArguments.Length - 1)
{
break;
}
}
Type baseType = null;
int elementCount = elementTypes.Count;
if (elementCount == 1)
{
baseType = typeof(Tuple <>);
}
else if (elementCount == 2)
{
baseType = typeof(Tuple <,>);
}
else if (elementCount == 3)
{
baseType = typeof(Tuple <, ,>);
}
else if (elementCount == 4)
{
baseType = typeof(Tuple <, , ,>);
}
else if (elementCount == 5)
{
baseType = typeof(Tuple <, , , ,>);
}
else if (elementCount == 6)
{
baseType = typeof(Tuple <, , , , ,>);
}
e.Type = baseType.MakeGenericType(elementTypes.ToArray());
}
private void CheckVariableContextExpression(VariableContextExpression e, TypeCheckingContext context)
{
foreach (VariableInfo variable in e.Variables)
{
context.VariableContext.Set(variable.Name, context.CreateAutoCreatedVariableValue(variable.Type));
}
PerformTypeChecking(e.Expression, context);
foreach (VariableInfo variable in e.Variables)
{
context.VariableContext.Remove(variable.Name);
}
e.Type = typeof(VariableContextExpression);
e.Evaluator = new MathyExpressionEvaluator();
}
private void CheckVariableExpression(VariableExpression e, TypeCheckingContext context)
{
LambdaVariable variable = context.LambdaContext.GetVariable(e.VariableName);
if (variable != null)
{
e.Type = context.LambdaContext.GetVariable(variable.Name).Type;
}
else if (context.VariableContext.HasVariable(e.VariableName))
{
e.Type = context.VariableContext.GetType(e.VariableName);
}
else if (context.CreateVariableOnAssign && context.RightOperandType != null)
{
context.VariableContext.Set(e.VariableName, context.CreateAutoCreatedVariableValue(context.RightOperandType));
e.Type = context.VariableContext.GetType(e.VariableName);
}
else
{
context.ErrorProvider.ThrowException(string.Format("{0} not defined.", e.VariableName), e);
}
}