public override DLR.Expression GenerateExpressionTree(GenScope scope)
{
if (!scope.IsInLambda())
{
throw new InvalidOperationException("No function to return from!");
}
if (Expression is null)
{
return(DLR.Expression.Goto(scope.GetFirstLambdaScope().CreateReturnTarget()));
}
var expression = Expression.GenerateExpressionTree(scope);
return(DLR.Expression.Goto(scope.GetFirstLambdaScope().CreateReturnTarget(false), expression, expression.Type));
}
public override DLR.Expression GenerateExpressionTree(GenScope scope)
{
if (scope.IsInLoop() || scope.IsInLambda())
{
throw new InvalidOperationException("Cannot declare a function inside the body of another function or inside a loop!");
}
if (scope.Root.FunctionDefinitions.ContainsKey(Name))
{
throw new InvalidOperationException($"Function \"{Name}\" is already defined!");
}
var functionScope = scope.CreateLambda();
var parameters = new DLR.ParameterExpression[Parameters.Count];
for (var i = 0; i < Parameters.Count; i++)
{
var name = Parameters.ElementAt(i).Name;
var param = DLR.Expression.Parameter(typeof(object), name);
parameters[i] = param;
functionScope.Definitions[name] = param;
}
var body = Body.GenerateExpressionTree(functionScope);
DLR.LambdaExpression function = null;
if (functionScope.ReturnTarget is null) //void returning function
{
function = DLR.Expression.Lambda(body, Name, parameters);
}
else
{
var wrapper = DLR.Expression.Block(body, DLR.Expression.Label(functionScope.ReturnTarget, body));
function = DLR.Expression.Lambda(wrapper, Name, parameters);
}
scope.Root.FunctionDefinitions[Name] = function.Compile();
return(function);
}
