IronLua.Compiler.Scope.BreakLabel C# (CSharp) Method

        public LabelTarget BreakLabel()
        {
            return breakLabel ?? (breakLabel = Expr.Label());
        }

        Expr IStatementVisitor <Expr> .Visit(Statement.ForIn statement)
        {
            var iterFuncVar  = Expr.Variable(typeof(object));
            var iterStateVar = Expr.Variable(typeof(object));
            var iterableVar  = Expr.Variable(typeof(object));
            var iterVars     = new[] { iterFuncVar, iterStateVar, iterableVar };

            var valueExprs     = statement.Values.Select(v => Expr.Convert(v.Visit(this), typeof(object)));
            var assignIterVars = VarargsExpandAssignment(iterVars, valueExprs);

            var parentScope = scope;

            scope = Scope.CreateChild(scope);
            var locals = statement.Identifiers.Select(id => scope.AddLocal(id)).ToList();

            var invokeIterFunc = Expr.Dynamic(Context.DynamicCache.GetInvokeBinder(new CallInfo(2)),
                                              typeof(object), iterFuncVar, iterStateVar, iterableVar);
            var loop =
                Expr.Loop(
                    Expr.Block(
                        locals,
                        VarargsExpandAssignment(
                            locals,
                            new[] { invokeIterFunc }),
                        Expr.IfThen(Expr.Equal(locals[0], Expr.Constant(null)), Expr.Break(scope.BreakLabel())),
                        Visit(statement.Body)),
                    scope.BreakLabel());

            var expr = Expr.Block(iterVars, assignIterVars, loop);

            scope = parentScope;
            return(expr);
        }