public override DLR.Expression GenerateExpressionTree(GenScope scope)
{
var loop = scope.CreateLoop();
var condition = Utils.Convert(Condition.GenerateExpressionTree(scope), typeof(bool));
var block = Block.GenerateExpressionTree(loop);
return(Utils.While(condition, block, DLR.Expression.Empty(), loop.BreakTarget, loop.ContinueTarget));
}
public override DLR.Expression GenerateExpressionTree(GenScope scope)
{
var loopScope = scope.CreateLoop();
var bindVar = DLR.Expression.Variable(typeof(object), VariableName);
var inExpr = InExpression.GenerateExpressionTree(scope);
loopScope.Definitions[VariableName] = bindVar;
var block = Block.GenerateExpressionTree(loopScope);
var enumeratorVar = DLR.Expression.Variable(typeof(object), "$enumeratorVar");
var getEnumeratorCall = DLR.Expression.Dynamic(
scope.Runtime.GetInvokeMemberBinder(new Tuple <string, CallInfo>("GetEnumerator", new CallInfo(0))),
typeof(object),
inExpr);
var enumeratorAssign = DLR.Expression.Assign(enumeratorVar, getEnumeratorCall);
var enumeratorDispose = DLR.Expression.Dynamic(scope.Runtime.GetInvokeMemberBinder(new Tuple <string, CallInfo>("Dispose", new CallInfo(0))),
typeof(void),
enumeratorVar);
var moveNextCall = DLR.Expression.Dynamic(scope.Runtime.GetInvokeMemberBinder(new Tuple <string, CallInfo>("MoveNext", new CallInfo(0))),
typeof(object),
enumeratorVar);
var loop =
DLR.Expression.Loop(
DLR.Expression.IfThenElse(
DLR.Expression.Convert(
DLR.Expression.Dynamic(scope.Runtime.GetBinaryOperationBinder(ExpressionType.Equal), typeof(object), moveNextCall, DLR.Expression.Constant(true)),
typeof(bool)),
DLR.Expression.Block(
new[] { bindVar },
DLR.Expression.Assign(bindVar, DLR.Expression.Dynamic(scope.Runtime.GetGetMemberBinder("Current"), typeof(object), enumeratorVar)),
block),
DLR.Expression.Break(loopScope.BreakTarget)),
loopScope.BreakTarget,
loopScope.ContinueTarget);
var tryFinally =
DLR.Expression.TryFinally(
loop,
DLR.Expression.IfThen( //Arrays do not implement IDisposable, so we need to check
DLR.Expression.TypeIs(enumeratorVar, typeof(IDisposable)), enumeratorDispose));
var body =
DLR.Expression.Block(
new[] { enumeratorVar },
enumeratorAssign,
tryFinally);
return(body);
}