//Function used to construct our expression. This is used to properly create a curried function call, which will be
//able to support partial function application.
protected Expression ToExpression(
Expression function,
IEnumerable <string> parameters,
int expectedArgs,
Dictionary <INode, string> symbols,
Dictionary <INode, List <INode> > letEntries,
HashSet <string> initializedIds,
HashSet <string> conditionalIds)
{
//If no arguments have been supplied and if we are expecting arguments, simply return the function.
if (arguments.Keys.Count == 0 && expectedArgs > 0)
{
return(function);
}
//If the number of expected arguments is greater than how many arguments have been supplied, we perform a partial
//application, returning a function which takes the remaining arguments.
if (arguments.Keys.Count < expectedArgs)
{
//Get all of the missing arguments.
IEnumerable <string> missingArgs = parameters.Where(
input => !arguments.ContainsKey(input)
);
//Return a function that...
return(Utils.MakeAnon(
//...takes all of the missing arguments...
missingArgs.ToList(),
Expression.NewList_E(
FSharpList <Expression> .Cons(
//...and calls this function...
function,
Utils.SequenceToFSharpList(
//...with the arguments which were supplied.
parameters.Select(
input =>
missingArgs.Contains(input)
? Expression.NewId(input)
: arguments[input].compile(
symbols, letEntries, initializedIds, conditionalIds)))))));
}
//If all the arguments were supplied, just return a standard function call expression.
else
{
return(Expression.NewList_E(
FSharpList <Expression> .Cons(
function,
Utils.SequenceToFSharpList(
parameters.Select(
input => arguments[input].compile(
symbols, letEntries, initializedIds, conditionalIds))
)
)
));
}
}
protected override Expression compileBody(
Dictionary <INode, string> symbols,
Dictionary <INode, List <INode> > letEntries,
HashSet <string> initializedIds,
HashSet <string> conditionalIds)
{
var arg = arguments.First().Value.compile(
symbols, letEntries, initializedIds, conditionalIds);
//idle :: (() -> A) -> A
//Evaluates the given function in the Revit Idle thread.
var idle = Expression.NewFunction_E(
FSharpFunc <FSharpList <Value>, Value> .FromConverter(
args =>
{
var f = (args[0] as Value.Function).Item;
if (dynSettings.Controller.DynamoViewModel.RunInDebug)
{
return(f.Invoke(FSharpList <Value> .Empty));
}
return(IdlePromise <Value> .ExecuteOnIdle(
() => f.Invoke(FSharpList <Value> .Empty)));
}));
//startTransaction :: () -> ()
//Starts a Dynamo Transaction.
var startTransaction = Expression.NewFunction_E(
FSharpFunc <FSharpList <Value>, Value> .FromConverter(
_ =>
{
if (_node.Controller.RunCancelled)
{
throw new CancelEvaluationException(false);
}
if (!dynSettings.Controller.DynamoViewModel.RunInDebug)
{
dynRevitSettings.Controller.InIdleThread = true;
dynRevitSettings.Controller.InitTransaction();
}
return(Value.NewDummy("started transaction"));
}));
//endTransaction :: () -> ()
//Ends a Dynamo Transaction.
var endTransaction = Expression.NewFunction_E(
FSharpFunc <FSharpList <Value>, Value> .FromConverter(
_ =>
{
if (!dynRevitSettings.Controller.DynamoViewModel.RunInDebug)
{
dynRevitSettings.Controller.EndTransaction();
dynRevitSettings.Controller.InIdleThread = false;
dynSettings.Controller.DynamoViewModel.OnRequestLayoutUpdate(this, EventArgs.Empty);
_node.ValidateConnections();
}
else
{
_node.setDirty(false);
}
return(Value.NewDummy("ended transaction"));
}));
/* (define (idleArg)
* (startTransaction)
* (let ((a <arg>))
* (endTransaction)
* a))
*/
var idleArg = Expression.NewFun(
FSharpList <FScheme.Parameter> .Empty,
Expression.NewBegin(
Utils.SequenceToFSharpList(new List <Expression>
{
Expression.NewList_E(
Utils.SequenceToFSharpList(
new List <Expression> {
startTransaction
})),
Expression.NewLet(
Utils.SequenceToFSharpList(
new List <string> {
"__result"
}),
Utils.SequenceToFSharpList(
new List <Expression> {
arg
}),
Expression.NewBegin(
Utils.SequenceToFSharpList(
new List <Expression>
{
Expression.NewList_E(
Utils.SequenceToFSharpList(
new List <Expression> {
endTransaction
})),
Expression.NewId("__result")
})))
})));
// (idle idleArg)
return(Expression.NewList_E(
Utils.SequenceToFSharpList(new List <Expression>
{
idle,
idleArg
})));
}