updating.

4 files changed, 659 insertions, 354 deletions

diff --git a/MoonParser.xcodeproj/project.pbxproj b/MoonParser.xcodeproj/project.pbxproj
index 4d48a86..db93034 100644
--- a/MoonParser.xcodeproj/project.pbxproj
+++ b/MoonParser.xcodeproj/project.pbxproj
@@ -107,7 +107,7 @@
                 3C0F0F641EF3781E000EADDB /* Project object */ = {
                         isa = PBXProject;
                         attributes = {
-                                LastUpgradeCheck = 1030;
+                                LastUpgradeCheck = 1100;
                                 ORGANIZATIONNAME = "Li Jin";
                                 TargetAttributes = {
                                         3C0F0F6B1EF3781E000EADDB = {
@@ -257,6 +257,7 @@
                 3C0F0F741EF3781E000EADDB /* Debug */ = {
                         isa = XCBuildConfiguration;
                         buildSettings = {
+                                CODE_SIGN_IDENTITY = "-";
                                 OTHER_CPLUSPLUSFLAGS = (
                                         "$(OTHER_CFLAGS)",
                                         "-ftemplate-depth=512",
@@ -269,6 +270,7 @@
                 3C0F0F751EF3781E000EADDB /* Release */ = {
                         isa = XCBuildConfiguration;
                         buildSettings = {
+                                CODE_SIGN_IDENTITY = "-";
                                 OTHER_CPLUSPLUSFLAGS = (
                                         "$(OTHER_CFLAGS)",
                                         "-ftemplate-depth=512",
diff --git a/MoonParser/moon_ast.cpp b/MoonParser/moon_ast.cpp
index 217f2b5..c2e940c 100644
--- a/MoonParser/moon_ast.cpp
+++ b/MoonParser/moon_ast.cpp
@@ -36,7 +36,6 @@ AST_IMPL(Seperator)
 AST_IMPL(NameList)
 AST_IMPL(Local)
 AST_IMPL(colon_import_name)
-AST_IMPL(ImportName)
 AST_IMPL(Import)
 AST_IMPL(ExpListLow)
 AST_IMPL(ExpList)
@@ -58,7 +57,6 @@ AST_IMPL(TblComprehension)
 AST_IMPL(star_exp)
 AST_IMPL(CompForEach)
 AST_IMPL(CompFor)
-AST_IMPL(CompClause)
 AST_IMPL(CompInner)
 AST_IMPL(Assign)
 AST_IMPL(update_op)
@@ -154,7 +152,7 @@ public:
 private:
         int _indentOffset = 0;
         Converter _converter;
-        std::vector<input> _codeCache;
+        std::list<input> _codeCache;
         std::stack<std::string> _withVars;
         std::ostringstream _buf;
         std::string _newLine = "\n";
@@ -186,6 +184,7 @@ private:
         };
 
         struct DestructItem {
+                bool isVariable = false;
                 std::string name;
                 std::string structure;
         };
@@ -219,18 +218,19 @@ private:
         bool isDefined(const std::string& name, bool checkShadowScopeOnly = false) {
                 bool isDefined = false;
                 int mode = int(std::isupper(name[0]) ? ExportMode::Capital : ExportMode::Any);
-                for (auto it = _scopes.rbegin(); it != _scopes.rend(); ++it) {
-                        if (int(it->mode) >= mode) {
-                                if (it->exports) {
-                                        if (it->exports->find(name) != it->exports->end()) {
-                                                isDefined = true;
-                                                break;
-                                        }
-                                } else {
+                const auto& current = _scopes.back();
+                if (int(current.mode) >= mode) {
+                        if (current.exports) {
+                                if (current.exports->find(name) != current.exports->end()) {
                                         isDefined = true;
-                                        break;
+                                        current.vars->insert(name);
                                 }
+                        } else {
+                                isDefined = true;
+                                current.vars->insert(name);
                         }
+                }
+                for (auto it = _scopes.rbegin(); it != _scopes.rend(); ++it) {
                         auto vars = it->vars.get();
                         if (vars->find(name) != vars->end()) {
                                 isDefined = true;
@@ -324,8 +324,12 @@ private:
                 return _newLine;
         }
 
-        void setIndentOffset(int offset) {
-                _indentOffset = offset;
+        void incIndentOffset() {
+                _indentOffset++;
+        }
+
+        void decIndentOffset() {
+                _indentOffset--;
         }
 
         std::string indent() {
@@ -436,12 +440,12 @@ private:
                 return parse<T>(_codeCache.back(), r, el, &st);
         }
 
-        template <class T>
-        bool matchAst(std::string_view codes, rule& r) {
+        bool matchAst(rule& r, std::string_view codes) {
                 error_list el;
                 State st;
                 input i = _converter.from_bytes(s(codes));
-                return parse<T>(i, r, el, &st);
+                auto rEnd = rule(r >> eof());
+                return _parse(i, rEnd, el, &st);
         }
 
         bool isChainValueCall(ChainValue_t* chainValue) {
@@ -453,6 +457,20 @@ private:
                 return false;
         }
 
+        std::string variableFrom(ast_node* expList) {
+                if (!ast_is<Exp_t, ExpList_t>(expList)) return Empty;
+                if (auto value = singleValueFrom(expList)) {
+                        if (auto chainValue = value->getByPath<ChainValue_t>()) {
+                                if (!chainValue->arguments) {
+                                        if (auto callable = chainValue->caller.as<Callable_t>()) {
+                                                return toString(callable->item);
+                                        }
+                                }
+                        }
+                }
+                return Empty;
+        }
+
         bool isColonChain(ChainValue_t* chainValue) {
                 if (chainValue->arguments) return false;
                 if (auto chain = chainValue->caller.as<Chain_t>()) {
@@ -550,39 +568,13 @@ private:
                                 }
                                 case "CompInner"_id: {
                                         auto compInner = appendix->item.to<CompInner_t>();
-                                        switch (compInner->compFor->getId()) {
-                                                case "CompFor"_id: {
-                                                        auto compFor = compInner->compFor.to<CompFor_t>();
-                                                        auto forNode = new_ptr<For_t>();
-                                                        forNode->startValue.set(compFor->startValue);
-                                                        forNode->stopValue.set(compFor->stopValue);
-                                                        forNode->stepValue.set(compFor->stepValue);
-                                                        forNode->varName.set(compFor->varName);
-                                                        auto stmt = new_ptr<Statement_t>();
-                                                        stmt->content.set(statement->content);
-                                                        auto body = new_ptr<Body_t>();
-                                                        body->content.set(stmt);
-                                                        forNode->body.set(body);
-                                                        statement->appendix.set(nullptr);
-                                                        statement->content.set(forNode);
-                                                        break;
-                                                }
-                                                case "CompForEach"_id: {
-                                                        auto compForEach = compInner->compFor.to<CompForEach_t>();
-                                                        auto forEach = new_ptr<ForEach_t>();
-                                                        forEach->nameList.set(compForEach->nameList);
-                                                        forEach->loopValue.set(compForEach->loopValue);
-                                                        auto stmt = new_ptr<Statement_t>();
-                                                        stmt->content.set(statement->content);
-                                                        auto body = new_ptr<Body_t>();
-                                                        body->content.set(stmt);
-                                                        forEach->body.set(body);
-                                                        statement->appendix.set(nullptr);
-                                                        statement->content.set(forEach);
-                                                        break;
-                                                }
-                                                default: break;
-                                        }
+                                        auto comp = new_ptr<Comprehension_t>();
+                                        comp->forLoop.set(compInner);
+                                        auto stmt = new_ptr<Statement_t>();
+                                        stmt->content.set(statement->content);
+                                        comp->value.set(stmt);
+                                        statement->content.set(comp);
+                                        statement->appendix.set(nullptr);
                                         break;
                                 }
                                 default: break;
@@ -594,8 +586,8 @@ private:
                         return;
                 }
                 switch (content->getId()) {
-                        case "Import"_id: transformImport(content, out); break;
-                        case "While"_id: transformWhile(content, out); break;
+                        case "Import"_id: transformImport(static_cast<Import_t*>(content), out); break;
+                        case "While"_id: transformWhile(static_cast<While_t*>(content), out); break;
                         case "With"_id: transformWith(static_cast<With_t*>(content), out); break;
                         case "For"_id: transformFor(static_cast<For_t*>(content), out); break;
                         case "ForEach"_id: transformForEach(static_cast<ForEach_t*>(content), out); break;
@@ -605,6 +597,7 @@ private:
                         case "Export"_id: transformExport(static_cast<Export_t*>(content), out); break;
                         case "BreakLoop"_id: transformBreakLoop(content, out); break;
                         case "Assignment"_id: transformAssignment(static_cast<Assignment_t*>(content), out); break;
+                        case "Comprehension"_id: transformCompCommon(static_cast<Comprehension_t*>(content), out); break;
                         case "ExpList"_id: {
                                 auto expList = static_cast<ExpList_t*>(content);
                                 if (expList->exprs.objects().empty()) {
@@ -653,18 +646,10 @@ private:
 
         std::vector<std::string> getAssignVars(ExpList_t* expList) {
                 std::vector<std::string> vars;
-                expList->traverse([&](ast_node* child) {
-                        if (child->getId() == "Value"_id) {
-                                if (auto target = child->getByPath<ChainValue_t, Callable_t, Variable_t>()) {
-                                        auto name = toString(target);
-                                        vars.push_back(name);
-                                } else {
-                                        vars.push_back(Empty);
-                                }
-                                return traversal::Return;
-                        }
-                        return traversal::Continue;
-                });
+                for (auto exp : expList->exprs.objects()) {
+                        auto var = variableFrom(exp);
+                        vars.push_back(var.empty() ? Empty : var);
+                }
                 return vars;
         }
 
@@ -697,6 +682,30 @@ private:
                 return indent() + s("local "sv) + join(defs, ", "sv);
         }
 
+        std::string getDestrucureDefine(Assignment_t* assignment) {
+                auto info = extractDestructureInfo(assignment);
+                if (!info.first.empty()) {
+                        for (const auto& destruct : info.first) {
+                                std::vector<std::string> defs;
+                                for (const auto& item : destruct.items) {
+                                        if (item.isVariable && addToScope(item.name)) {
+                                                defs.push_back(item.name);
+                                        }
+                                }
+                                if (!defs.empty()) _buf << indent() << "local "sv << join(defs,", "sv);
+                        }
+                }
+                return clearBuf();
+        }
+
+        std::string getPredefine(Assignment_t* assignment) {
+                auto preDefine = getDestrucureDefine(assignment);
+                if (preDefine.empty()) {
+                        preDefine = getPredefine(transformAssignDefs(assignment->assignable));
+                }
+                return preDefine.empty() ? preDefine : preDefine + nll(assignment);
+        }
+
         void transformAssignment(Assignment_t* assignment, std::vector<std::string>& out) {
                 auto assign = ast_cast<Assign_t>(assignment->target);
                 do {
@@ -744,71 +753,73 @@ private:
                         }
                         auto exp = ast_cast<Exp_t>(value);
                         if (!exp) break;
-                        auto simpleVal = exp->value->item.as<SimpleValue_t>();
-                        if (!simpleVal) break;
-                        auto valueItem = simpleVal->value.get();
-                        switch (valueItem->getId()) {
-                                case "Do"_id: {
-                                        auto expList = assignment->assignable.get();
-                                        auto doNode = static_cast<Do_t*>(valueItem);
-                                        auto last = lastStatementFrom(doNode->body);
-                                        auto valueList = last ? last->content.as<ExpList_t>() : nullptr;
-                                        if (last && valueList) {
-                                                auto newAssignment = new_ptr<Assignment_t>();
-                                                newAssignment->assignable.set(expList);
-                                                auto assign = new_ptr<Assign_t>();
-                                                assign->values.dup(valueList->exprs);
-                                                newAssignment->target.set(assign);
-                                                last->content.set(newAssignment);
-                                                std::string preDefine = getPredefine(transformAssignDefs(expList));
-                                                auto nl = preDefine.empty() ? Empty : nll(assignment);
-                                                transformDo(doNode, out);
-                                                out.back() = preDefine + nl + out.back();
+                        if (auto simpleVal = exp->value->item.as<SimpleValue_t>()) {
+                                auto valueItem = simpleVal->value.get();
+                                switch (valueItem->getId()) {
+                                        case "Do"_id: {
+                                                auto expList = assignment->assignable.get();
+                                                auto doNode = static_cast<Do_t*>(valueItem);
+                                                auto last = lastStatementFrom(doNode->body);
+                                                auto valueList = last ? last->content.as<ExpList_t>() : nullptr;
+                                                if (last && valueList) {
+                                                        auto newAssignment = new_ptr<Assignment_t>();
+                                                        newAssignment->assignable.set(expList);
+                                                        auto assign = new_ptr<Assign_t>();
+                                                        assign->values.dup(valueList->exprs);
+                                                        newAssignment->target.set(assign);
+                                                        last->content.set(newAssignment);
+                                                        std::string preDefine = getPredefine(assignment);
+                                                        transformDo(doNode, out);
+                                                        out.back() = preDefine + out.back();
+                                                }
+                                                return;
+                                        }
+                                        case "Comprehension"_id: {
+                                                auto expList = assignment->assignable.get();
+                                                std::string preDefine = getPredefine(assignment);
+                                                transformCompInPlace(static_cast<Comprehension_t*>(valueItem), expList, out);
+                                                out.back() = preDefine + out.back();
+                                                return;
+                                        }
+                                        case "TblComprehension"_id: {
+                                                auto expList = assignment->assignable.get();
+                                                std::string preDefine = getPredefine(assignment);
+                                                transformTblCompInPlace(static_cast<TblComprehension_t*>(valueItem), expList, out);
+                                                out.back() = preDefine + out.back();
+                                                return;
+                                        }
+                                        case "For"_id: {
+                                                std::vector<std::string> temp;
+                                                auto expList = assignment->assignable.get();
+                                                std::string preDefine = getPredefine(assignment);
+                                                transformForInPlace(static_cast<For_t*>(valueItem), temp, expList);
+                                                out.push_back(preDefine + temp.front());
+                                                return;
+                                        }
+                                        case "ForEach"_id: {
+                                                std::vector<std::string> temp;
+                                                auto expList = assignment->assignable.get();
+                                                std::string preDefine = getPredefine(assignment);
+                                                transformForEachInPlace(static_cast<ForEach_t*>(valueItem), temp, expList);
+                                                out.push_back(preDefine + temp.front());
+                                                return;
+                                        }
+                                        case "ClassDecl"_id: {
+                                                std::vector<std::string> temp;
+                                                auto expList = assignment->assignable.get();
+                                                std::string preDefine = getPredefine(assignment);
+                                                transformClassDecl(static_cast<ClassDecl_t*>(valueItem), temp, ExpUsage::Assignment, expList);
+                                                out.push_back(preDefine + temp.front());
+                                                return;
+                                        }
+                                        case "While"_id: {
+                                                std::vector<std::string> temp;
+                                                auto expList = assignment->assignable.get();
+                                                std::string preDefine = getPredefine(assignment);
+                                                transformWhileClosure(static_cast<While_t*>(valueItem), temp, expList);
+                                                out.push_back(preDefine + temp.front());
+                                                return;
                                         }
-                                        return;
-                                }
-                                case "Comprehension"_id: {
-                                        auto expList = assignment->assignable.get();
-                                        std::string preDefine = getPredefine(transformAssignDefs(expList));
-                                        auto nl = preDefine.empty() ? Empty : nll(assignment);
-                                        transformCompInPlace(static_cast<Comprehension_t*>(valueItem), expList, out);
-                                        out.back() = preDefine + nl + out.back();
-                                        return;
-                                }
-                                case "TblComprehension"_id: {
-                                        auto expList = assignment->assignable.get();
-                                        std::string preDefine = getPredefine(transformAssignDefs(expList));
-                                        auto nl = preDefine.empty() ? Empty : nll(assignment);
-                                        transformTblCompInPlace(static_cast<TblComprehension_t*>(valueItem), expList, out);
-                                        out.back() = preDefine + nl + out.back();
-                                        return;
-                                }
-                                case "For"_id: {
-                                        std::vector<std::string> temp;
-                                        auto expList = assignment->assignable.get();
-                                        std::string preDefine = getPredefine(transformAssignDefs(expList));
-                                        auto nl = preDefine.empty() ? Empty : nll(assignment);
-                                        transformForInPlace(static_cast<For_t*>(valueItem), temp, expList);
-                                        out.push_back(preDefine + nl + temp.front());
-                                        return;
-                                }
-                                case "ForEach"_id: {
-                                        std::vector<std::string> temp;
-                                        auto expList = assignment->assignable.get();
-                                        std::string preDefine = getPredefine(transformAssignDefs(expList));
-                                        transformForEachInPlace(static_cast<ForEach_t*>(valueItem), temp, expList);
-                                        auto nl = preDefine.empty() ? Empty : nll(assignment);
-                                        out.push_back(preDefine + nl + temp.front());
-                                        return;
-                                }
-                                case "ClassDecl"_id: {
-                                        std::vector<std::string> temp;
-                                        auto expList = assignment->assignable.get();
-                                        std::string preDefine = getPredefine(transformAssignDefs(expList));
-                                        transformClassDecl(static_cast<ClassDecl_t*>(valueItem), temp, ExpUsage::Assignment, expList);
-                                        auto nl = preDefine.empty() ? Empty : nll(assignment);
-                                        out.push_back(preDefine + nl + temp.front());
-                                        return;
                                 }
                         }
                         if (auto chainValue = exp->value->item.as<ChainValue_t>()) {
@@ -831,28 +842,35 @@ private:
                                 if (destruct.items.size() == 1) {
                                         auto& pair = destruct.items.front();
                                         _buf << indent();
-                                        if (addToScope(pair.name)) {
+                                        if (pair.isVariable && addToScope(pair.name)) {
                                                 _buf << s("local "sv);
                                         }
                                         _buf << pair.name << " = "sv << info.first.front().value << pair.structure << nll(assignment);
                                         temp.push_back(clearBuf());
-                                } else if (matchAst<Name_t>(destruct.value, Name)) {
+                                } else if (matchAst(Name, destruct.value)) {
                                         std::vector<std::string> defs, names, values;
                                         for (const auto& item : destruct.items) {
-                                                if (addToScope(item.name)) {
+                                                if (item.isVariable && addToScope(item.name)) {
                                                         defs.push_back(item.name);
                                                 }
                                                 names.push_back(item.name);
                                                 values.push_back(item.structure);
                                         }
-                                        if (!defs.empty()) _buf << indent() << "local "sv << join(defs,", "sv) << nll(assignment);
                                         for (auto& v : values) v.insert(0, destruct.value);
-                                        _buf << indent() << join(names, ", "sv) << " = "sv << join(values, ", "sv) << nll(assignment);
+                                        if (defs.empty()) {
+                                                _buf << indent() << join(names, ", "sv) << " = "sv << join(values, ", "sv) << nll(assignment);
+                                        } else {
+                                                _buf << indent() << "local "sv;
+                                                if (defs.size() != names.size()) {
+                                                        _buf << join(defs,", "sv) << nll(assignment) << indent();
+                                                }
+                                                _buf << join(names, ", "sv) << " = "sv << join(values, ", "sv) << nll(assignment);
+                                        }
                                         temp.push_back(clearBuf());
                                 } else {
                                         std::vector<std::string> defs, names, values;
                                         for (const auto& item : destruct.items) {
-                                                if (addToScope(item.name)) {
+                                                if (item.isVariable && addToScope(item.name)) {
                                                         defs.push_back(item.name);
                                                 }
                                                 names.push_back(item.name);
@@ -888,7 +906,7 @@ private:
                 }
         }
 
-        std::list<std::pair<std::string, std::string>> destructFromExp(ast_node* node) {
+        std::list<DestructItem> destructFromExp(ast_node* node) {
                 const std::list<ast_node*>* tableItems = nullptr;
                 if (ast_cast<Exp_t>(node)) {
                         auto item = singleValueFrom(node)->item.get();
@@ -903,7 +921,7 @@ private:
                 } else if (auto table = ast_cast<TableBlock_t>(node)) {
                         tableItems = &table->values.objects();
                 }
-                std::list<std::pair<std::string, std::string>> pairs;
+                std::list<DestructItem> pairs;
                 int index = 0;
                 for (auto pair : *tableItems) {
                         switch (pair->getId()) {
@@ -911,26 +929,29 @@ private:
                                         ++index;
                                         auto item = singleValueFrom(pair)->item.get();
                                         if (!item) throw std::logic_error("Invalid destructure value");
-                                        if (auto value = item->getByPath<Callable_t, Variable_t>()) {
-                                                auto name = toString(value);
-                                                //"Can't destructure value of type: parens"
-                                                pairs.push_back({name, s("["sv) + std::to_string(index) + s("]"sv)});
-                                                break;
-                                        }
+                                        if (item->getId() == "Parens"_id)  throw std::logic_error("Can't destructure value of type: parens");
                                         if (ast_cast<simple_table_t>(item) ||
                                                 item->getByPath<TableLit_t>()) {
                                                 auto subPairs = destructFromExp(pair);
                                                 for (auto& p : subPairs) {
-                                                        pairs.push_back({p.first, s("["sv) + std::to_string(index) + s("]"sv) + p.second});
+                                                        pairs.push_back({p.isVariable, p.name,
+                                                                s("["sv) + std::to_string(index) + s("]"sv) + p.structure});
                                                 }
-                                                break;
+                                        } else {
+                                                std::vector<std::string> temp;
+                                                transformExp(static_cast<Exp_t*>(pair), temp);
+                                                pairs.push_back({
+                                                        item->getByPath<Callable_t, Variable_t>(),
+                                                        temp.back(),
+                                                        s("["sv) + std::to_string(index) + s("]"sv)
+                                                });
                                         }
                                         break;
                                 }
                                 case "variable_pair"_id: {
                                         auto vp = static_cast<variable_pair_t*>(pair);
                                         auto name = toString(vp->name);
-                                        pairs.push_back({name, s("."sv) + name});
+                                        pairs.push_back({true, name, s("."sv) + name});
                                         break;
                                 }
                                 case "normal_pair"_id: {
@@ -940,23 +961,28 @@ private:
                                         if (auto exp = np->value.as<Exp_t>()) {
                                                 auto item = singleValueFrom(exp)->item.get();
                                                 if (!item) throw std::logic_error("Invalid destructure value");
-                                                if (auto var = item->getByPath<Callable_t, Variable_t>()) {
-                                                        pairs.push_back({toString(var), s("."sv) + toString(key)});
-                                                        break;
-                                                }
                                                 if (ast_cast<simple_table_t>(item) ||
                                                         item->getByPath<TableLit_t>()) {
                                                         auto subPairs = destructFromExp(exp);
                                                         for (auto& p : subPairs) {
-                                                                pairs.push_back({p.first, s("."sv) + toString(key) + p.second});
+                                                                pairs.push_back({p.isVariable, p.name,
+                                                                        s("."sv) + toString(key) + p.structure});
                                                         }
-                                                        break;
+                                                } else {
+                                                        std::vector<std::string> temp;
+                                                        transformExp(exp, temp);
+                                                        pairs.push_back({
+                                                                item->getByPath<Callable_t, Variable_t>(),
+                                                                temp.back(), s("."sv) + toString(key)
+                                                        });
                                                 }
+                                                break;
                                         }
                                         if (np->value.as<TableBlock_t>()) {
                                                 auto subPairs = destructFromExp(pair);
                                                 for (auto& p : subPairs) {
-                                                        pairs.push_back({p.first, s("."sv) + toString(key) + p.second});
+                                                        pairs.push_back({p.isVariable, p.name,
+                                                                s("."sv) + toString(key) + p.structure});
                                                 }
                                         }
                                         break;
@@ -990,16 +1016,14 @@ private:
                         ast_node* destructNode = expr->getByPath<Value_t, SimpleValue_t, TableLit_t>();
                         if (destructNode || (destructNode = expr->getByPath<Value_t, simple_table_t>())) {
                                 destructPairs.push_back({i,j});
+                                pushScope();
                                 transformAssignItem(*j, temp);
+                                popScope();
                                 auto& destruct = destructs.emplace_back();
                                 destruct.value = temp.back();
                                 temp.pop_back();
                                 auto pairs = destructFromExp(expr);
-                                for (auto& pair : pairs) {
-                                        auto& item = destruct.items.emplace_back();
-                                        item.name = std::move(pair.first);
-                                        item.structure = std::move(pair.second);
-                                }
+                                destruct.items = std::move(pairs);
                         }
                 }
                 for (const auto& p : destructPairs) {
@@ -1116,17 +1140,50 @@ private:
                 }
                 auto assign = ifCondPairs.front().first->assign.get();
                 if (assign) {
-                        auto exp = ifCondPairs.front().first->condition.get();
-                        auto expList = new_ptr<ExpList_t>();
-                        expList->exprs.push_back(exp);
-                        auto assignment = new_ptr<Assignment_t>();
-                        assignment->assignable.set(expList);
-                        assignment->target.set(assign);
                         if (usage != IfUsage::Closure) {
                                 temp.push_back(indent() + s("do"sv) + nll(assign));
                                 pushScope();
                         }
-                        transformAssignment(assignment, temp);
+                        auto exp = ifCondPairs.front().first->condition.get();
+                        if (auto table = exp->getByPath<Value_t, SimpleValue_t, TableLit_t>()) {
+                                std::string desVar = getUnusedName("_des_");
+                                bool storingValue = true;
+                                if (assign->values.objects().size() == 1) {
+                                        auto var = variableFrom(assign->values.objects().front());
+                                        if (!var.empty()) {
+                                                desVar = var;
+                                                storingValue = false;
+                                        }
+                                }
+                                if (storingValue) {
+                                        auto expList = toAst<ExpList_t>(desVar, ExpList);
+                                        auto assignment = new_ptr<Assignment_t>();
+                                        assignment->assignable.set(expList);
+                                        assignment->target.set(assign);
+                                        transformAssignment(assignment, temp);
+                                }
+                                {
+                                        auto expList = new_ptr<ExpList_t>();
+                                        expList->exprs.push_back(exp);
+                                        auto assignOne = new_ptr<Assign_t>();
+                                        auto valExp = toAst<Exp_t>(desVar, Exp);
+                                        assignOne->values.push_back(valExp);
+                                        auto assignment = new_ptr<Assignment_t>();
+                                        assignment->assignable.set(expList);
+                                        assignment->target.set(assignOne);
+                                        transformAssignment(assignment, temp);
+                                        auto pair = destructFromExp(exp);
+                                        auto cond = toAst<Exp_t>(pair.front().name, Exp);
+                                        ifCondPairs.front().first->condition.set(cond);
+                                }
+                        } else {
+                                auto expList = new_ptr<ExpList_t>();
+                                expList->exprs.push_back(exp);
+                                auto assignment = new_ptr<Assignment_t>();
+                                assignment->assignable.set(expList);
+                                assignment->target.set(assign);
+                                transformAssignment(assignment, temp);
+                        }
                 }
                 for (const auto& pair : ifCondPairs) {
                         if (pair.first) {
@@ -1260,7 +1317,7 @@ private:
                         case "ClassDecl"_id: transformClassDeclClosure(static_cast<ClassDecl_t*>(value), out); break;
                         case "ForEach"_id: transformForEachClosure(static_cast<ForEach_t*>(value), out); break;
                         case "For"_id: transformForClosure(static_cast<For_t*>(value), out); break;
-                        case "While"_id: transformWhile(value, out); break;
+                        case "While"_id: transformWhileClosure(static_cast<While_t*>(value), out); break;
                         case "Do"_id: transformDoClosure(static_cast<Do_t*>(value), out); break;
                         case "unary_exp"_id: transform_unary_exp(static_cast<unary_exp_t*>(value), out); break;
                         case "TblComprehension"_id: transformTblCompClosure(static_cast<TblComprehension_t*>(value), out); break;
@@ -1294,8 +1351,8 @@ private:
                                 popScope();
                                 _buf << indent() << "end"sv;
                         } else {
-                                _buf << " end"sv;
                                 popScope();
+                                _buf << " end"sv;
                         }
                 } else {
                         if (funLit->body) {
@@ -1312,8 +1369,8 @@ private:
                                 popScope();
                                 _buf << indent() << "end"sv;
                         } else {
-                                _buf << " end"sv;
                                 popScope();
+                                _buf << " end"sv;
                         }
                 }
                 out.push_back(clearBuf());
@@ -1329,8 +1386,7 @@ private:
                                 expListLow->exprs = expList->exprs;
                                 auto returnNode = new_ptr<Return_t>();
                                 returnNode->valueList.set(expListLow);
-                                auto statement = ast_cast<Statement_t>(last);
-                                statement->content.set(returnNode);
+                                last->content.set(returnNode);
                         }
                 }
                 std::vector<std::string> temp;
@@ -1391,13 +1447,14 @@ private:
                                 out.push_back(indent() + s("return "sv) + temp.back() + nlr(returnNode));
                         }
                 } else {
-                        out.push_back(s("return"sv) + nll(returnNode));
+                        out.push_back(indent() + s("return"sv) + nll(returnNode));
                 }
         }
 
         void transformFnArgsDef(FnArgsDef_t* argsDef, std::vector<std::string>& out) {
                 if (!argsDef->defList) {
                         out.push_back(Empty);
+                        out.push_back(Empty);
                         return;
                 }
                 transformFnArgDefList(argsDef->defList, out);
@@ -1419,7 +1476,6 @@ private:
                 struct ArgItem {
                         std::string name;
                         std::string assignSelf;
-                        std::string defaultVal;
                 };
                 std::list<ArgItem> argItems;
                 std::vector<std::string> temp;
@@ -1453,17 +1509,24 @@ private:
                                         break;
                                 }
                         }
+                        forceAddToScope(arg.name);
                         if (def->defaultValue) {
-                                transformExp(static_cast<Exp_t*>(def->defaultValue.get()), temp);
-                                arg.defaultVal = temp.front();
-                                temp.clear();
-                                _buf << indent() << "if "sv << arg.name << " == nil then"sv << nll(def) <<
-                                        indent(1) << arg.name << " = "sv << arg.defaultVal << nll(def) <<
-                                        indent() << "end"sv << nll(def);
+                                pushScope();
+                                auto expList = toAst<ExpList_t>(arg.name, ExpList);
+                                auto assign = new_ptr<Assign_t>();
+                                assign->values.push_back(def->defaultValue.get());
+                                auto assignment = new_ptr<Assignment_t>();
+                                assignment->assignable.set(expList);
+                                assignment->target.set(assign);
+                                transformAssignment(assignment, temp);
+                                popScope();
+                                _buf << indent() << "if "sv << arg.name << " == nil then"sv << nll(def);
+                                _buf << temp.back();
+                                _buf << indent() << "end"sv << nll(def);
+                                temp.back() = clearBuf();
                         }
                         if (varNames.empty()) varNames = arg.name;
                         else varNames.append(s(", "sv) + arg.name);
-                        forceAddToScope(arg.name);
                 }
                 if (argDefList->varArg) {
                         auto& arg = argItems.emplace_back();
@@ -1471,7 +1534,7 @@ private:
                         if (varNames.empty()) varNames = arg.name;
                         else varNames.append(s(", "sv) + arg.name);
                 }
-                std::string initCodes = clearBuf();
+                std::string initCodes = join(temp);
                 if (assignSelf) {
                         auto sjoin = [](const decltype(argItems)& items, int index) {
                                 std::string result;
@@ -1514,7 +1577,7 @@ private:
                 pushScope();
                 transformColonChain(chainValue, temp, ExpUsage::Return);
                 popScope();
-                temp.push_back(s("end)()"sv));
+                temp.push_back(indent() + s("end)()"sv));
                 out.push_back(join(temp));
         }
 
@@ -1670,28 +1733,37 @@ private:
                 out.push_back(toString(num));
         }
 
-        void transformTableLit(TableLit_t* tableLit, std::vector<std::string>& out) {
+        void transformTableLit(TableLit_t* table, std::vector<std::string>& out) {
+                transformTable(table, table->values.objects(), out);
+        }
+
+        void transformCompCommon(Comprehension_t* comp, std::vector<std::string>& out) {
                 std::vector<std::string> temp;
-                ast_node* lastNode = nullptr;
-                for (auto value : tableLit->values.objects()) {
-                        switch (value->getId()) {
-                                case "variable_pair"_id:
-                                        transform_variable_pair(static_cast<variable_pair_t*>(value), temp);
+                auto compInner = comp->forLoop.get();
+                for (auto item : compInner->items.objects()) {
+                        switch (item->getId()) {
+                                case "CompForEach"_id:
+                                        transformCompForEach(static_cast<CompForEach_t*>(item), temp);
                                         break;
-                                case "normal_pair"_id:
-                                        transform_normal_pair(static_cast<normal_pair_t*>(value), temp);
+                                case "CompFor"_id:
+                                        transformCompFor(static_cast<CompFor_t*>(item), temp);
                                         break;
                                 case "Exp"_id:
+                                        transformExp(static_cast<Exp_t*>(item), temp);
+                                        temp.back() = indent() + s("if "sv) + temp.back() + s(" then"sv) + nll(item);
                                         pushScope();
-                                        transformExp(static_cast<Exp_t*>(value), temp);
-                                        popScope();
                                         break;
-                                default: break;
                         }
-                        temp.back() = (lastNode ? s(","sv) + nll(lastNode) : Empty) + indent(1) + temp.back();
-                        lastNode = value;
                 }
-                out.push_back(s("{"sv) + nll(tableLit) + join(temp) + nlr(tableLit) + indent() + s("}"sv));
+                transformStatement(comp->value.to<Statement_t>(), temp);
+                auto value = temp.back();
+                temp.pop_back();
+                _buf << join(temp) << value;
+                for (size_t i = 0; i < compInner->items.objects().size(); ++i) {
+                        popScope();
+                        _buf << indent() << "end"sv << nll(comp);
+                }
+                out.push_back(clearBuf());
         }
 
         void transformComprehension(Comprehension_t* comp, std::vector<std::string>& out) {
@@ -1701,56 +1773,35 @@ private:
                 addToScope(accum);
                 addToScope(len);
                 auto compInner = comp->forLoop.get();
-                switch (compInner->compFor->getId()) {
-                        case "CompForEach"_id:
-                                transformCompForEach(compInner->compFor.to<CompForEach_t>(), temp);
-                                break;
-                        case "CompFor"_id:
-                                transformCompFor(compInner->compFor.to<CompFor_t>(), temp);
-                                break;
-                        default: break;
-                }
-                std::vector<std::string> clauseCodes;
-                for (auto clause : compInner->clauses.objects()) {
-                        pushScope();
-                        auto child = clause->getFirstChild();
-                        switch (child->getId()) {
+                for (auto item : compInner->items.objects()) {
+                        switch (item->getId()) {
                                 case "CompForEach"_id:
-                                        transformCompForEach(static_cast<CompForEach_t*>(child), clauseCodes);
+                                        transformCompForEach(static_cast<CompForEach_t*>(item), temp);
+                                        break;
+                                case "CompFor"_id:
+                                        transformCompFor(static_cast<CompFor_t*>(item), temp);
                                         break;
-                                case "CompFor"_id: transformCompFor(static_cast<CompFor_t*>(child), clauseCodes); break;
                                 case "Exp"_id:
-                                        transformExp(static_cast<Exp_t*>(child), clauseCodes);
-                                        clauseCodes.back() = indent() + s("if "sv) + clauseCodes.back() + s(" then"sv) + nll(clause);
+                                        transformExp(static_cast<Exp_t*>(item), temp);
+                                        temp.back() = indent() + s("if "sv) + temp.back() + s(" then"sv) + nll(item);
+                                        pushScope();
                                         break;
-                                default: break;
                         }
                 }
-                pushScope();
-                transformExp(comp->value, temp);
-                popScope();
+                transformExp(comp->value.to<Exp_t>(), temp);
                 auto value = temp.back();
                 temp.pop_back();
-                for (size_t i = 0; i < compInner->clauses.objects().size(); ++i) {
+                for (size_t i = 0; i < compInner->items.objects().size(); ++i) {
                         popScope();
                 }
                 _buf << indent() << "local "sv << accum << " = { }"sv << nll(comp);
                 _buf << indent() << "local "sv << len << " = 1"sv << nll(comp);
-                _buf << temp.back();
-                pushScope();
-                if (clauseCodes.empty()) {
-                        _buf << indent() << accum << "["sv << len << "] = "sv << value << nll(comp);
-                        _buf << indent() << len << " = "sv << len << " + 1"sv << nll(comp);
-                } else {
-                        _buf << join(clauseCodes);
-                        _buf << indent(int(clauseCodes.size())) << accum << "["sv << len << "] = "sv << value << nll(comp);
-                        _buf << indent(int(clauseCodes.size())) << len << " = "sv << len << " + 1"sv << nll(comp);
-                        for (int ind = int(clauseCodes.size()) - 1; ind > -1 ; --ind) {
-                                _buf << indent(ind) << "end"sv << nll(comp);
-                        }
+                _buf << join(temp);
+                _buf << indent(int(temp.size())) << accum << "["sv << len << "] = "sv << value << nll(comp);
+                _buf << indent(int(temp.size())) << len << " = "sv << len << " + 1"sv << nll(comp);
+                for (int ind = int(temp.size()) - 1; ind > -1 ; --ind) {
+                        _buf << indent(ind) << "end"sv << nll(comp);
                 }
-                popScope();
-                _buf << indent() << "end"sv << nll(comp);
                 out.push_back(accum);
                 out.push_back(clearBuf());
         }
@@ -1759,11 +1810,18 @@ private:
                 std::vector<std::string> temp;
                 pushScope();
                 transformComprehension(comp, temp);
-                transformExpList(expList, temp);
+                auto assign = new_ptr<Assign_t>();
+                assign->values.push_back(toAst<Exp_t>(temp.front(), Exp));
+                auto assignment = new_ptr<Assignment_t>();
+                assignment->assignable.set(expList);
+                assignment->target.set(assign);
+                assignment->m_begin.m_line = comp->m_end.m_line;
+                assignment->m_end.m_line = comp->m_end.m_line;
+                transformAssignment(assignment, temp);
                 out.push_back(
                         s("do"sv) + nll(comp) +
                         temp[1] +
-                        indent() + temp.back() + s(" = "sv) + temp.front() + nll(comp));
+                        temp.back());
                 popScope();
                 out.back() = out.back() + indent() + s("end"sv) + nlr(comp);
         }
@@ -1806,13 +1864,19 @@ private:
                                 default: break;
                         }
                 }
+                std::list<std::string> varBefore, varAfter;
                 switch (loopTarget->getId()) {
                         case "star_exp"_id: {
                                 auto star_exp = static_cast<star_exp_t*>(loopTarget);
-                                auto listVar = getUnusedName("_list_");
+                                bool newListVal = false;
+                                auto listVar = variableFrom(star_exp->value);
+                                if (listVar.empty()) {
+                                        newListVal = true;
+                                        listVar = getUnusedName("_list_");
+                                        varBefore.push_back(listVar);
+                                }
                                 auto indexVar = getUnusedName("_index_");
-                                addToScope(listVar);
-                                addToScope(indexVar);
+                                varAfter.push_back(indexVar);
                                 auto value = singleValueFrom(star_exp->value);
                                 if (!value) throw std::logic_error("Invalid star syntax");
                                 bool endWithSlice = false;
@@ -1846,12 +1910,14 @@ private:
                                                 stepValue = temp.back();
                                                 temp.pop_back();
                                         }
-                                        transformChain(chain, temp);
-                                        _buf << indent() << "local "sv << listVar << " = "sv << temp.back() << nll(nameList);
+                                        if (newListVal) {
+                                                transformChain(chain, temp);
+                                                _buf << indent() << "local "sv << listVar << " = "sv << temp.back() << nll(nameList);
+                                        }
                                         std::string maxVar;
                                         if (!stopValue.empty()) {
                                                 maxVar = getUnusedName("_max_");
-                                                addToScope(maxVar);
+                                                varBefore.push_back(maxVar);
                                                 _buf << indent() << "local "sv << maxVar << " = "sv << stopValue << nll(nameList);
                                         }
                                         _buf << indent() << "for "sv << indexVar << " = "sv;
@@ -1870,7 +1936,7 @@ private:
                                 } while (false);
                                 if (!endWithSlice) {
                                         transformExp(star_exp->value, temp);
-                                        _buf << indent() << "local "sv << listVar << " = "sv << temp.back() << nll(nameList);
+                                        if (newListVal) _buf << indent() << "local "sv << listVar << " = "sv << temp.back() << nll(nameList);
                                         _buf << indent() << "for "sv << indexVar << " = 1, #"sv << listVar << " do"sv << nlr(loopTarget);
                                         _buf << indent(1) << "local "sv << join(vars) << " = "sv << listVar << "["sv << indexVar << "]"sv << nll(nameList);
                                         out.push_back(clearBuf());
@@ -1911,6 +1977,9 @@ private:
                         out.back().append(join(temp));
                         popScope();
                 }
+                for (auto& var : varBefore) addToScope(var);
+                pushScope();
+                for (auto& var : varAfter) addToScope(var);
         }
 
         void transformCompForEach(CompForEach_t* comp, std::vector<std::string>& out) {
@@ -2017,8 +2086,14 @@ private:
                 temp.push_back(indent() + len + s(" = "sv) + len + s(" + 1"sv) + nlr(forNode->body));
                 popScope();
                 temp.push_back(indent() + s("end"sv) + nlr(forNode));
-                transformExpList(assignExpList, temp);
-                temp.back() = indent() + temp.back() + s(" = "sv) + accum + nlr(forNode);
+                auto assign = new_ptr<Assign_t>();
+                assign->values.push_back(toAst<Exp_t>(accum, Exp));
+                auto assignment = new_ptr<Assignment_t>();
+                assignment->assignable.set(assignExpList);
+                assignment->target.set(assign);
+                assignment->m_begin.m_line = forNode->m_end.m_line;
+                assignment->m_end.m_line = forNode->m_end.m_line;
+                transformAssignment(assignment, temp);
                 popScope();
                 temp.push_back(indent() + s("end"sv) + nlr(forNode));
                 out.push_back(join(temp));
@@ -2103,8 +2178,14 @@ private:
                 temp.push_back(indent() + len + s(" = "sv) + len + s(" + 1"sv) + nlr(forEach->body));
                 popScope();
                 temp.push_back(indent() + s("end"sv) + nlr(forEach));
-                transformExpList(assignExpList, temp);
-                temp.back() = indent() + temp.back() + s(" = "sv) + accum + nlr(forEach);
+                auto assign = new_ptr<Assign_t>();
+                assign->values.push_back(toAst<Exp_t>(accum, Exp));
+                auto assignment = new_ptr<Assignment_t>();
+                assignment->assignable.set(assignExpList);
+                assignment->target.set(assign);
+                assignment->m_begin.m_line = forEach->m_end.m_line;
+                assignment->m_end.m_line = forEach->m_end.m_line;
+                transformAssignment(assignment, temp);
                 popScope();
                 temp.push_back(indent() + s("end"sv) + nlr(forEach));
                 out.push_back(join(temp));
@@ -2116,7 +2197,6 @@ private:
         }
 
         void transform_normal_pair(normal_pair_t* pair, std::vector<std::string>& out) {
-                pushScope();
                 auto key = pair->key.get();
                 std::vector<std::string> temp;
                 switch (key->getId()) {
@@ -2141,7 +2221,6 @@ private:
                         default: break;
                 }
                 out.push_back(temp[0] + s(" = "sv) + temp[1]);
-                popScope();
         }
 
         void transformKeyName(KeyName_t* keyName, std::vector<std::string>& out) {
@@ -2247,9 +2326,9 @@ private:
                         assignItem = temp.back();
                         temp.pop_back();
                 } else if (expList) {
-                        auto firstValue = firstValueFrom(expList);
-                        if (auto name = firstValue->getByPath<ChainValue_t, Callable_t, Variable_t>()) {
-                                className = s("\""sv) + toString(name) + s("\""sv);
+                        auto name = variableFrom(expList);
+                        if (!name.empty()) {
+                                className = s("\""sv) + name + s("\""sv);
                         }
                 }
                 temp.push_back(indent() + s("do"sv) + nll(classDecl));
@@ -2268,7 +2347,7 @@ private:
                                                 if (!info.first.empty()) {
                                                         for (const auto& destruct : info.first)
                                                                 for (const auto& item : destruct.items)
-                                                                        if (addToScope(item.name))
+                                                                        if (item.isVariable && addToScope(item.name))
                                                                                 varDefs.push_back(item.name);
                                                 }
                                         }
@@ -2345,6 +2424,15 @@ private:
                         temp.back() += s("{ }"sv) + nll(classDecl);
                 }
                 temp.push_back(indent() + baseVar + s(".__index = "sv) + baseVar + nll(classDecl));
+                std::vector<std::string> tmp;
+                if (usage == ExpUsage::Assignment) {
+                        auto assign = new_ptr<Assign_t>();
+                        assign->values.push_back(toAst<Exp_t>(classVar, Exp));
+                        auto assignment = new_ptr<Assignment_t>();
+                        assignment->assignable.set(expList);
+                        assignment->target.set(assign);
+                        transformAssignment(assignment, tmp);
+                }
                 if (extend) {
                         _buf << indent() << "setmetatable("sv << baseVar << ", "sv << parentVar << ".__base)"sv << nll(classDecl);
                 }
@@ -2408,9 +2496,7 @@ private:
                                 break;
                         }
                         case ExpUsage::Assignment: {
-                                std::vector<std::string> tmp;
-                                transformExpList(expList, tmp);
-                                _buf << indent() << tmp.back() << " = "sv << classVar << nlr(classDecl);
+                                _buf << tmp.back();
                                 break;
                         }
                         default: break;
@@ -2509,8 +2595,9 @@ private:
                                         return traversal::Continue;
                                 });
                         } while (false);
+                        pushScope();
                         if (type == MemType::Property) {
-                                setIndentOffset(-1);
+                                decIndentOffset();
                         }
                         switch (keyValue->getId()) {
                                 case "variable_pair"_id:
@@ -2521,8 +2608,9 @@ private:
                                         break;
                         }
                         if (type == MemType::Property) {
-                                setIndentOffset(0);
+                                incIndentOffset();
                         }
+                        popScope();
                         out.push_back({temp.back(), type, keyValue});
                         temp.clear();
                         ++count;
@@ -2542,42 +2630,51 @@ private:
 
         void transformWith(With_t* with, std::vector<std::string>& out) {
                 std::vector<std::string> temp;
-                temp.push_back(indent() + s("do"sv) + nll(with));
-                pushScope();
                 std::string withVar;
+                bool scoped = false;
                 if (with->assigns) {
                         auto vars = getAssignVars(with->valueList);
                         if (vars.front().empty()) {
-                                withVar = getUnusedName("_with_");
-                                {
+                                if (with->assigns->values.objects().size() == 1) {
+                                        auto var = variableFrom(with->assigns->values.objects().front());
+                                        if (!var.empty()) {
+                                                withVar = var;
+                                        }
+                                }
+                                if (withVar.empty()) {
+                                        withVar = getUnusedName("_with_");
                                         auto assignment = new_ptr<Assignment_t>();
                                         assignment->assignable.set(toAst<ExpList_t>(withVar, ExpList));
                                         auto assign = new_ptr<Assign_t>();
                                         assign->values.push_back(with->assigns->values.objects().front());
                                         assignment->target.set(assign);
+                                        scoped = true;
+                                        temp.push_back(indent() + s("do"sv) + nll(with));
+                                        pushScope();
                                         transformAssignment(assignment, temp);
                                 }
-                                {
-                                        auto assignment = new_ptr<Assignment_t>();
-                                        assignment->assignable.set(with->valueList);
-                                        auto assign = new_ptr<Assign_t>();
-                                        assign->values.push_back(toAst<Exp_t>(withVar, Exp));
-                                        bool skipFirst = true;
-                                        for (auto value : with->assigns->values.objects()) {
-                                                if (skipFirst) {
-                                                        skipFirst = false;
-                                                        continue;
-                                                }
-                                                assign->values.push_back(value);
+                                auto assignment = new_ptr<Assignment_t>();
+                                assignment->assignable.set(with->valueList);
+                                auto assign = new_ptr<Assign_t>();
+                                assign->values.push_back(toAst<Exp_t>(withVar, Exp));
+                                bool skipFirst = true;
+                                for (auto value : with->assigns->values.objects()) {
+                                        if (skipFirst) {
+                                                skipFirst = false;
+                                                continue;
                                         }
-                                        assignment->target.set(assign);
-                                        transformAssignment(assignment, temp);
+                                        assign->values.push_back(value);
                                 }
+                                assignment->target.set(assign);
+                                transformAssignment(assignment, temp);
                         } else {
                                 withVar = vars.front();
                                 auto assignment = new_ptr<Assignment_t>();
                                 assignment->assignable.set(with->valueList);
                                 assignment->target.set(with->assigns);
+                                scoped = true;
+                                temp.push_back(indent() + s("do"sv) + nll(with));
+                                pushScope();
                                 transformAssignment(assignment, temp);
                         }
                 } else {
@@ -2587,13 +2684,23 @@ private:
                         auto assign = new_ptr<Assign_t>();
                         assign->values.dup(with->valueList->exprs);
                         assignment->target.set(assign);
+                        scoped = true;
+                        temp.push_back(indent() + s("do"sv) + nll(with));
+                        pushScope();
                         transformAssignment(assignment, temp);
                 }
+                auto exp = with->valueList->exprs.objects().front();
+                if (exp->getByPath<Value_t, SimpleValue_t, TableLit_t>()) {
+                        auto pair = destructFromExp(exp);
+                        withVar = pair.front().name;
+                }
                 _withVars.push(withVar);
                 transformBody(with->body, temp);
                 _withVars.pop();
-                popScope();
-                temp.push_back(indent() + s("end"sv) + nll(with));
+                if (scoped) {
+                        popScope();
+                        temp.push_back(indent() + s("end"sv) + nll(with));
+                }
                 out.push_back(join(temp));
         }
 
@@ -2643,6 +2750,10 @@ private:
                                         assign->values.dup(values->valueList->exprs);
                                         assignment->target.set(assign);
                                         transformAssignment(assignment, out);
+                                } else {
+                                        for (auto name : values->nameList->names.objects()) {
+                                                addExportedVar(toString(name));
+                                        }
                                 }
                                 break;
                         }
@@ -2651,19 +2762,24 @@ private:
                 }
         }
 
-        void transform_simple_table(simple_table_t* table, std::vector<std::string>& out) {
+        void transformTable(ast_node* table, const std::list<ast_node*>& pairs, std::vector<std::string>& out) {
                 std::vector<std::string> temp;
                 pushScope();
-                const auto& pairs = table->pairs.objects();
                 for (auto pair : pairs) {
                         switch (pair->getId()) {
+                                case "Exp"_id: transformExp(static_cast<Exp_t*>(pair), temp); break;
                                 case "variable_pair"_id: transform_variable_pair(static_cast<variable_pair_t*>(pair), temp); break;
                                 case "normal_pair"_id: transform_normal_pair(static_cast<normal_pair_t*>(pair), temp); break;
                         }
                         temp.back() = indent() + temp.back() + (pair == pairs.back() ? Empty : s(","sv)) + nll(pair);
                 }
+                out.push_back(s("{"sv) + nll(table) + join(temp));
                 popScope();
-                out.push_back(s("{"sv) + nll(table) + join(temp) + s("}"sv));
+                out.back() += (indent() + s("}"sv));
+        }
+
+        void transform_simple_table(simple_table_t* table, std::vector<std::string>& out) {
+                transformTable(table, table->pairs.objects(), out);
         }
 
         void transformTblComprehension(TblComprehension_t* comp, std::vector<std::string>& out) {
@@ -2672,60 +2788,41 @@ private:
                 addToScope(tbl);
                 std::vector<std::string> temp;
                 auto compInner = comp->forLoop.get();
-                switch (compInner->compFor->getId()) {
-                        case "CompForEach"_id:
-                                transformCompForEach(compInner->compFor.to<CompForEach_t>(), temp);
-                                break;
-                        case "CompFor"_id:
-                                transformCompFor(compInner->compFor.to<CompFor_t>(), temp);
-                                break;
-                        default: break;
-                }
-                std::vector<std::string> clauseCodes;
-                for (auto clause : compInner->clauses.objects()) {
-                        pushScope();
-                        auto child = clause->getFirstChild();
-                        switch (child->getId()) {
+                for (auto item : compInner->items.objects()) {
+                        switch (item->getId()) {
                                 case "CompForEach"_id:
-                                        transformCompForEach(static_cast<CompForEach_t*>(child), clauseCodes);
+                                        transformCompForEach(static_cast<CompForEach_t*>(item), temp);
                                         break;
                                 case "CompFor"_id:
-                                        transformCompFor(static_cast<CompFor_t*>(child), clauseCodes);
+                                        transformCompFor(static_cast<CompFor_t*>(item), temp);
                                         break;
                                 case "Exp"_id:
-                                        transformExp(static_cast<Exp_t*>(child), clauseCodes);
-                                        clauseCodes.back() = indent() + s("if "sv) + clauseCodes.back() + s(" then"sv) + nll(clause);
+                                        transformExp(static_cast<Exp_t*>(item), temp);
+                                        temp.back() = indent() + s("if "sv) + temp.back() + s(" then"sv) + nll(item);
+                                        pushScope();
                                         break;
-                                default: break;
                         }
                 }
-                pushScope();
                 transformExp(comp->key, kv);
-                popScope();
                 if (comp->value) {
                         transformExp(comp->value->value, kv);
                 }
-                for (size_t i = 0; i < compInner->clauses.objects().size(); ++i) {
+                for (size_t i = 0; i < compInner->items.objects().size(); ++i) {
                         popScope();
                 }
                 _buf << indent() << "local "sv << tbl << " = { }"sv << nll(comp);
-                _buf << temp.back();
+                _buf << join(temp);
                 pushScope();
                 if (!comp->value) {
                         auto keyVar = getUnusedName("_key_");
                         auto valVar = getUnusedName("_val_");
-                        _buf << indent() << "local "sv << keyVar << ", "sv << valVar << " = "sv << kv.front() << nll(comp);
+                        _buf << indent(int(temp.size())-1) << "local "sv << keyVar << ", "sv << valVar << " = "sv << kv.front() << nll(comp);
                         kv.front() = keyVar;
                         kv.push_back(valVar);
                 }
-                if (clauseCodes.empty()) {
-                        _buf << indent() << tbl << "["sv << kv.front() << "] = "sv << kv.back() << nll(comp);
-                } else {
-                        _buf << join(clauseCodes);
-                        _buf << indent(int(clauseCodes.size())) << tbl << "["sv << kv.front() << "] = "sv << kv.back() << nll(comp);
-                        for (int ind = int(clauseCodes.size()) - 1; ind > -1 ; --ind) {
-                                _buf << indent(ind) << "end"sv << nll(comp);
-                        }
+                _buf << indent(int(temp.size())-1) << tbl << "["sv << kv.front() << "] = "sv << kv.back() << nll(comp);
+                for (int ind = int(temp.size()) - 2; ind > -1 ; --ind) {
+                        _buf << indent(ind) << "end"sv << nll(comp);
                 }
                 popScope();
                 _buf << indent() << "end"sv << nll(comp);
@@ -2737,14 +2834,18 @@ private:
                 std::vector<std::string> temp;
                 pushScope();
                 transformTblComprehension(comp, temp);
-                const auto& tbVar = temp.front();
-                const auto& compBody = temp.back();
-                transformExpList(expList, temp);
-                const auto& assignLeft = temp.back();
+                auto assign = new_ptr<Assign_t>();
+                assign->values.push_back(toAst<Exp_t>(temp.front(), Exp));
+                auto assignment = new_ptr<Assignment_t>();
+                assignment->assignable.set(expList);
+                assignment->target.set(assign);
+                assignment->m_begin.m_line = comp->m_end.m_line;
+                assignment->m_end.m_line = comp->m_end.m_line;
+                transformAssignment(assignment, temp);
                 out.push_back(
                         s("do"sv) + nll(comp) +
-                        compBody +
-                        indent() + assignLeft + s(" = "sv) + tbVar + nll(comp));
+                        temp[1] +
+                        temp.back());
                 popScope();
                 out.back() = out.back() + indent() + s("end"sv) + nlr(comp);
         }
@@ -2782,22 +2883,12 @@ private:
                 }
                 _buf << indent() << "for "sv << varName << " = "sv << temp[0] << ", "sv << temp[1] << (temp[2].empty() ? Empty : s(", "sv) + temp[2]) << " do"sv << nll(comp);
                 out.push_back(clearBuf());
+                pushScope();
+                addToScope(varName);
         }
 
         void transformTableBlock(TableBlock_t* table, std::vector<std::string>& out) {
-                std::vector<std::string> temp;
-                pushScope();
-                const auto& pairs = table->values.objects();
-                for (auto pair : pairs) {
-                        switch (pair->getId()) {
-                                case "Exp"_id: transformExp(static_cast<Exp_t*>(pair), temp); break;
-                                case "variable_pair"_id: transform_variable_pair(static_cast<variable_pair_t*>(pair), temp); break;
-                                case "normal_pair"_id: transform_normal_pair(static_cast<normal_pair_t*>(pair), temp); break;
-                        }
-                        temp.back() = indent() + temp.back() + (pair == pairs.back() ? Empty : s(","sv)) + nll(pair);
-                }
-                popScope();
-                out.push_back(s("{"sv) + nll(table) + join(temp) + s("}"sv));
+                transformTable(table, table->values.objects(), out);
         }
 
         void transformDo(Do_t* doNode, std::vector<std::string>& out, bool implicitReturn = false) {
@@ -2820,9 +2911,166 @@ private:
                 out.push_back(join(temp));
         }
 
+        void transformImport(Import_t* import, std::vector<std::string>& out) {
+                std::vector<std::string> temp;
+                auto objVar = variableFrom(import->exp);
+                ast_ptr<Assignment_t, false, false> objAssign;
+                if (objVar.empty()) {
+                        objVar = getUnusedName("_obj_"sv);
+                        auto expList = toAst<ExpList_t>(objVar, ExpList);
+                        auto assign = new_ptr<Assign_t>();
+                        assign->values.push_back(import->exp);
+                        auto assignment = new_ptr<Assignment_t>();
+                        assignment->assignable.set(expList);
+                        assignment->target.set(assign);
+                        objAssign.set(assignment);
+                }
+                auto expList = new_ptr<ExpList_t>();
+                auto assign = new_ptr<Assign_t>();
+                for (auto name : import->names.objects()) {
+                        switch (name->getId()) {
+                                case "Variable"_id: {
+                                        auto var = ast_to<Variable_t>(name);
+                                        {
+                                                auto callable = toAst<Callable_t>(objVar, Callable);
+                                                auto dotChainItem = new_ptr<DotChainItem_t>();
+                                                dotChainItem->name.set(var->name);
+                                                auto chain = new_ptr<Chain_t>();
+                                                chain->items.push_back(callable);
+                                                chain->items.push_back(dotChainItem);
+                                                auto chainValue = new_ptr<ChainValue_t>();
+                                                chainValue->caller.set(chain);
+                                                auto value = new_ptr<Value_t>();
+                                                value->item.set(chainValue);
+                                                auto exp = new_ptr<Exp_t>();
+                                                exp->value.set(value);
+                                                assign->values.push_back(exp);
+                                        }
+                                        auto callable = new_ptr<Callable_t>();
+                                        callable->item.set(var);
+                                        auto chainValue = new_ptr<ChainValue_t>();
+                                        chainValue->caller.set(callable);
+                                        auto value = new_ptr<Value_t>();
+                                        value->item.set(chainValue);
+                                        auto exp = new_ptr<Exp_t>();
+                                        exp->value.set(value);
+                                        expList->exprs.push_back(exp);
+                                        break;
+                                }
+                                case "colon_import_name"_id: {
+                                        auto var = static_cast<colon_import_name_t*>(name)->name.get();
+                                        {
+                                                auto nameNode = var->name.get();
+                                                auto callable = toAst<Callable_t>(objVar, Callable);
+                                                auto colonChain = new_ptr<ColonChainItem_t>();
+                                                colonChain->name.set(nameNode);
+                                                auto chain = new_ptr<Chain_t>();
+                                                chain->items.push_back(callable);
+                                                chain->items.push_back(colonChain);
+                                                auto chainValue = new_ptr<ChainValue_t>();
+                                                chainValue->caller.set(chain);
+                                                auto value = new_ptr<Value_t>();
+                                                value->item.set(chainValue);
+                                                auto exp = new_ptr<Exp_t>();
+                                                exp->value.set(value);
+                                                assign->values.push_back(exp);
+                                        }
+                                        auto callable = new_ptr<Callable_t>();
+                                        callable->item.set(var);
+                                        auto chainValue = new_ptr<ChainValue_t>();
+                                        chainValue->caller.set(callable);
+                                        auto value = new_ptr<Value_t>();
+                                        value->item.set(chainValue);
+                                        auto exp = new_ptr<Exp_t>();
+                                        exp->value.set(value);
+                                        expList->exprs.push_back(exp);
+                                        break;
+                                }
+                        }
+                }
+                if (objAssign) {
+                        auto preDef = getPredefine(transformAssignDefs(expList));
+                        if (!preDef.empty()) {
+                                temp.push_back(preDef + nll(import));
+                        }
+                        temp.push_back(indent() + s("do"sv) + nll(import));
+                        pushScope();
+                        transformAssignment(objAssign, temp);
+                }
+                auto assignment = new_ptr<Assignment_t>();
+                assignment->assignable.set(expList);
+                assignment->target.set(assign);
+                transformAssignment(assignment, temp);
+                if (objAssign) {
+                        popScope();
+                        temp.push_back(indent() + s("end"sv) + nlr(import));
+                }
+                out.push_back(join(temp));
+        }
+
+        void transformWhileClosure(While_t* whileNode, std::vector<std::string>& out, ExpList_t* expList = nullptr) {
+                std::vector<std::string> temp;
+                if (expList) {
+                        temp.push_back(indent() + s("do"sv) + nll(whileNode));
+                } else {
+                        temp.push_back(s("(function() "sv) + nll(whileNode));
+                }
+                pushScope();
+                auto accumVar = getUnusedName("_accum_"sv);
+                addToScope(accumVar);
+                auto lenVar = getUnusedName("_len_"sv);
+                addToScope(lenVar);
+                temp.push_back(indent() + s("local "sv) + accumVar + s(" = { }"sv) + nll(whileNode));
+                temp.push_back(indent() + s("local "sv) + lenVar + s(" = 1"sv) + nll(whileNode));
+                transformExp(whileNode->condition, temp);
+                temp.back() = indent() + s("while "sv) + temp.back() + s(" do"sv) + nll(whileNode);
+                pushScope();
+                auto last = lastStatementFrom(whileNode->body);
+                auto valueList = last ? last->content.as<ExpList_t>() : nullptr;
+                if (last && valueList) {
+                        auto newAssignment = new_ptr<Assignment_t>();
+                        newAssignment->assignable.set(toAst<ExpList_t>(accumVar + s("["sv) + lenVar + s("]"sv), ExpList));
+                        auto assign = new_ptr<Assign_t>();
+                        assign->values.dup(valueList->exprs);
+                        newAssignment->target.set(assign);
+                        last->content.set(newAssignment);
+                }
+                transformBody(whileNode->body, temp);
+                temp.push_back(indent() + lenVar + s(" = "sv) + lenVar + s(" + 1"sv) + nlr(whileNode));
+                popScope();
+                temp.push_back(indent() + s("end"sv) + nlr(whileNode));
+                if (expList) {
+                        auto assign = new_ptr<Assign_t>();
+                        assign->values.push_back(toAst<Exp_t>(accumVar, Exp));
+                        auto assignment = new_ptr<Assignment_t>();
+                        assignment->assignable.set(expList);
+                        assignment->target.set(assign);
+                        transformAssignment(assignment, temp);
+                } else {
+                        temp.push_back(indent() + s("return "sv) + accumVar + nlr(whileNode));
+                }
+                popScope();
+                if (expList) {
+                        temp.push_back(indent() + s("end"sv) + nlr(whileNode));
+                } else {
+                        temp.push_back(indent() + s("end)()"sv));
+                }
+                out.push_back(join(temp));
+        }
+
+        void transformWhile(While_t* whileNode, std::vector<std::string>& out) {
+                std::vector<std::string> temp;
+                pushScope();
+                transformExp(whileNode->condition, temp);
+                transformBody(whileNode->body, temp);
+                popScope();
+                _buf << indent() << "while "sv << temp.front() << " do"sv << nll(whileNode);
+                _buf << temp.back();
+                _buf << indent() << "end"sv << nlr(whileNode);
+                out.push_back(clearBuf());
+        }
+
         void transformUpdate(ast_node* node, std::vector<std::string>& out) {noop(node, out);}
-        void transformImport(ast_node* node, std::vector<std::string>& out) {noopnl(node, out);}
-        void transformWhile(ast_node* node, std::vector<std::string>& out) {noopnl(node, out);}
         void transformSwitch(ast_node* node, std::vector<std::string>& out) {noopnl(node, out);}
         void transformLocal(ast_node* node, std::vector<std::string>& out) {noopnl(node, out);}
         void transformBreakLoop(ast_node* node, std::vector<std::string>& out) {noopnl(node, out);}
@@ -2833,17 +3081,80 @@ const std::string MoonCompliler::Empty;
 
 int main()
 {
-        std::string s = R"TestCodesHere(a = 1 + do
-  123
+        std::string s = R"TestCodesHere(
+
+hi = [x*2 for _, x in ipairs{1,2,3,4}]
+
+items = {1,2,3,4,5,6}
+
+[z for z in ipairs items when z > 4]
+
+rad = [{a} for a in ipairs {
+   1,2,3,4,5,6,
+} when good_number a]
+
+
+[z for z in items for j in list when z > 4]
+
+require "util"
+
+dump = (x) -> print util.dump x
+
+range = (count) ->
+  i = 0
+  return coroutine.wrap ->
+    while i < count
+      coroutine.yield i
+      i = i + 1
+
+dump [x for x in range 10]
+dump [{x, y} for x in range 5 when x > 2 for y in range 5]
+
+things = [x + y for x in range 10 when x > 5 for y in range 10 when y > 7]
+
+print x,y for x in ipairs{1,2,4} for y in ipairs{1,2,3} when x != 2
+
+print "hello", x for x in items
+
+[x for x in x]
+x = [x for x in x]
+
+print x,y for x in ipairs{1,2,4} for y in ipairs{1,2,3} when x != 2
+
+double = [x*2 for x in *items]
+
+print x for x in *double
+
+cut = [x for x in *items when x > 3]
+
+hello = [x + y for x in *items for y in *items]
+
+print z for z in *hello
+
+
+-- slice
+x = {1, 2, 3, 4, 5, 6, 7}
+print y for y in *x[2,-5,2]
+print y for y in *x[,3]
+print y for y in *x[2,]
+print y for y in *x[,,2]
+print y for y in *x[2,,2]
+
+a, b, c = 1, 5, 2
+print y for y in *x[a,b,c]
+
+
+normal = (hello) ->
+  [x for x in yeah]
+
+
+test = x 1,2,3,4,5
+print thing for thing in *test
 
-a = do
-  123
+-> a = b for row in *rows
 
-do
-  123
 
-do
-  123)TestCodesHere";
+)TestCodesHere";
         MoonCompliler{}.complile(s);
         return 0;
 }
diff --git a/MoonParser/moon_ast.h b/MoonParser/moon_ast.h
index 4f6dc92..adaf29f 100644
--- a/MoonParser/moon_ast.h
+++ b/MoonParser/moon_ast.h
@@ -101,13 +101,9 @@ AST_END(colon_import_name)
 
 class Exp_t;
 
-AST_NODE(ImportName, "ImportName"_id)
-        ast_ptr<ast_node> name; // colon_import_name_t | Variable_t
-AST_END(ImportName)
-
 AST_NODE(Import, "Import"_id)
         ast_ptr<Seperator_t> sep;
-        ast_list<ImportName_t> names;
+        ast_sel_list<colon_import_name_t, Variable_t> names;
         ast_ptr<Exp_t> exp;
 AST_END(Import)
 
@@ -191,9 +187,10 @@ AST_NODE(Do, "Do"_id)
 AST_END(Do)
 
 class CompInner_t;
+class Statement_t;
 
 AST_NODE(Comprehension, "Comprehension"_id)
-        ast_ptr<Exp_t> value;
+        ast_sel<Exp_t, Statement_t> value;
         ast_ptr<CompInner_t> forLoop;
 AST_END(Comprehension)
 
@@ -223,14 +220,9 @@ AST_NODE(CompFor, "CompFor"_id)
         ast_ptr<for_step_value_t, true> stepValue;
 AST_END(CompFor)
 
-AST_NODE(CompClause, "CompClause"_id)
-        ast_ptr<ast_node> nestExp; // CompFor_t | CompForEach_t | Exp_t
-AST_END(CompClause)
-
 AST_NODE(CompInner, "CompInner"_id)
-        ast_ptr<ast_node> compFor; // CompFor_t | CompForEach_t
         ast_ptr<Seperator_t> sep;
-        ast_list<CompClause_t> clauses;
+        ast_sel_list<CompFor_t, CompForEach_t, Exp_t> items;
 AST_END(CompInner)
 
 class TableBlock_t;
diff --git a/MoonParser/moon_parser.cpp b/MoonParser/moon_parser.cpp
index 99cf1a1..3c3078a 100644
--- a/MoonParser/moon_parser.cpp
+++ b/MoonParser/moon_parser.cpp
@@ -208,11 +208,11 @@ extern rule CompInner;
 
 rule Comprehension = sym('[') >> Exp >> CompInner >> sym(']');
 rule comp_value = sym(',') >> Exp;
-rule TblComprehension = sym('{') >> (Exp >> -comp_value) >> CompInner >> sym('}');
+rule TblComprehension = sym('{') >> (Exp >> -comp_value)   >> CompInner >> sym('}');
 
 extern rule CompForEach, CompFor, CompClause;
 
-rule CompInner = (CompForEach | CompFor) >> Seperator >> *CompClause;
+rule CompInner = Seperator >> (CompForEach | CompFor) >> *CompClause;
 rule star_exp = sym('*') >> Exp;
 rule CompForEach = key("for") >> AssignableNameList >> key("in") >> (star_exp | Exp);
 rule CompFor = key("for") >> Space >> Variable >> sym('=') >> Exp >> sym(',') >> Exp >> -for_step_value;