static IReadOnlyCollection <VariableName> EnumerateCapturedVariables(ArrowFunctionExpr fn)
{
var capturedvars = new HashSet <VariableName>();
// collect all variables in fn
foreach (var v in fn.Expression.SelectLocalVariables())
{
capturedvars.Add(v.VarName);
}
// remove vars specified in parameters
foreach (var p in fn.Signature.FormalParams)
{
capturedvars.Remove(p.Name.Name);
}
//// intersect with variables from parent function scope
//var containingvars = new HashSet<VariableName>();
//foreach (var v in fn.GetContainingRoutine().SelectLocalVariables())
//{
// containingvars.Add(v.VarName);
//}
//capturedvars.IntersectWith(containingvars);
//
return(capturedvars);
}
public SourceArrowFnSymbol(ArrowFunctionExpr syntax, NamedTypeSymbol container)
: base(syntax, container)
{
_body = ImmutableArray.Create <Statement>(new JumpStmt(syntax.Expression.Span, JumpStmt.Types.Return, syntax.Expression));
_useparams = EnumerateCapturedVariables(syntax)
.Select(v => new FormalParam(Span.Invalid, v.Value, Span.Invalid, null, FormalParam.Flags.Default, null))
.ToArray();
}
