webserver_eval works, many things work

typon/include/python/builtins.hpp

@@ -65,8 +65,16 @@ namespace typon {
 
 // class TyNone {};
 
-using TyNone = std::nullopt_t;
-auto None = std::nullopt;
+//using TyNone = std::nullopt_t;
+
+struct TyNone {
+    operator bool() const { return false; }
+    operator std::nullopt_t() const { return std::nullopt; }
+    template <typename T>
+    operator std::optional<T>() const { return std::nullopt; }
+};
+
+auto None = TyNone{};
 
 } // namespace typon
 

typon/include/python/builtins/dict.hpp

@@ -173,21 +173,24 @@ struct TyDict__oo : classtype<_Base0, TyDict__oo<>> {
 
   template <typename K, typename V>
   struct Obj : instance<TyDict__oo<>, Obj<K, V>> {
+    using map_type = std::unordered_map<K, V>;
+    std::shared_ptr<map_type> _m;
 
-    std::shared_ptr<std::unordered_map<K, V>> _m;
-
-    Obj(std::shared_ptr<std::unordered_map<K, V>> &&m) : _m(std::move(m)) {}
+    /*Obj(std::shared_ptr<std::unordered_map<K, V>> &&m) : _m(std::move(m)) {}
     Obj(std::unordered_map<K, V> &&m)
         : _m(std::move(
-              std::make_shared<std::unordered_map<K, V>>(std::move(m)))) {}
-    Obj(std::initializer_list<std::pair<K, V>> &&m)
-        : _m(std::make_shared<std::unordered_map<K, V>>(std::move(m))) {}
+              std::make_shared<std::unordered_map<K, V>>(std::move(m)))) {}*/
+    Obj(std::initializer_list<typename map_type::value_type> &&m)
+        : _m(std::make_shared<map_type>(std::move(m))) {}
 
-    Obj() : _m(std::make_shared<std::unordered_map<K, V>>()) {}
+    Obj() : _m(std::make_shared<map_type>()) {}
     template <typename... Args>
     Obj(Args &&...args)
-        : _m(std::make_shared<std::unordered_map<K, V>>(
+        : _m(std::make_shared<map_type>(
               std::forward<Args>(args)...)) {}
+
+    auto begin() const { return _m->begin(); }
+    auto end() const { return _m->end(); }
   };
 
   template <typename T> auto operator()(std::initializer_list<T> &&v) const {

typon/include/python/builtins/slice.hpp

@@ -13,6 +13,10 @@
 namespace typon {
 using namespace referencemodel;
 
+struct UnpackedSlice {
+    ssize_t start, stop, step;
+  };
+
 template <typename _Base0 = object>
 struct TySlice__oo : classtype<_Base0, TySlice__oo<>> {
   static constexpr std::string_view name = "TySlice";
@@ -25,6 +29,33 @@ struct TySlice__oo : classtype<_Base0, TySlice__oo<>> {
 
     Obj(Start start, Stop stop, Step step)
         : start(start), stop(stop), step(step) {}
+
+    std::pair<ssize_t, UnpackedSlice> adjust_indices(ssize_t seq_length) {
+        UnpackedSlice res;
+
+        if constexpr (std::is_same_v<Step, TyNone>) {
+          res.step = 1;
+        } else {
+          res.step = this->step;
+        }
+
+        if constexpr (std::is_same_v<Start, TyNone>) {
+          res.start = res.step < 0 ? PY_SSIZE_T_MAX : 0;
+        } else {
+          res.start = this->start;
+        }
+
+        if constexpr (std::is_same_v<Stop, TyNone>) {
+          res.stop = res.step < 0 ? PY_SSIZE_T_MIN : PY_SSIZE_T_MAX;
+        } else {
+          res.stop = this->stop;
+        }
+
+        auto len =
+            PySlice_AdjustIndices(seq_length, &res.start, &res.stop, res.step);
+
+        return {len, res};
+      }
   };
 
   template <typename Stop> auto operator()(Stop stop) const {
@@ -64,36 +95,9 @@ static constexpr TySlice__oo<> TySlice{};
   std::optional<ssize_t> stop = 0;
   std::optional<ssize_t> step = 1;
 
-  struct UnpackedSlice {
-    ssize_t start, stop, step;
-  };
 
-  std::pair<ssize_t, UnpackedSlice> adjust_indices(ssize_t seq_length) {
-    UnpackedSlice res;
 
-    if (this->step == std::nullopt) {
-      res.step = 1;
-    } else {
-      res.step = this->step.value();
-    }
-
-    if (this->start == std::nullopt) {
-      res.start = res.step < 0 ? PY_SSIZE_T_MAX : 0;
-    } else {
-      res.start = this->start.value();
-    }
 
-    if (this->stop == std::nullopt) {
-      res.stop = res.step < 0 ? PY_SSIZE_T_MIN : PY_SSIZE_T_MAX;
-    } else {
-      res.stop = this->stop.value();
-    }
-
-    auto len =
-        PySlice_AdjustIndices(seq_length, &res.start, &res.stop, res.step);
-
-    return {len, res};
-  }
 };*/
 
 #endif // TYPON_SLICE_HPP

typon/include/python/builtins/str.hpp

@@ -178,6 +178,28 @@ struct TyStr__oo : classtype<_Base0, TyStr__oo<>> {
 
   // getitem
   struct : method {
+    auto operator()(auto self, TySlice__oo<>::Obj<auto, auto, auto> slice) const {
+      auto [len, new_slice] = slice.adjust_indices(self->value.size());
+      Obj result;
+      result.value.reserve(len);
+      if (new_slice.start < new_slice.stop) {
+        if (new_slice.step > 0) {
+          for (auto i = new_slice.start; i < new_slice.stop;
+               i += new_slice.step) {
+            result.value.push_back(self->value[i]);
+          }
+        }
+      } else {
+        if (new_slice.step < 0) {
+          for (auto i = new_slice.start; i > new_slice.stop;
+               i += new_slice.step) {
+            result.value.push_back(self->value[i]);
+          }
+        }
+      }
+      return result;
+    }
+
     auto operator()(auto self, auto index) const {
       if (index < 0) {
         index += self->value.size();
@@ -186,12 +208,24 @@ struct TyStr__oo : classtype<_Base0, TyStr__oo<>> {
     }
   } static constexpr oo__getitem__oo{};
 
-  /*struct : method {
+  struct : method {
       auto operator()(auto self, auto other) const {
       auto pos = self->value.find(other->value);
-      return typon::TyInt(pos == std::string::npos ? -1 : pos);
+      return (pos == std::string::npos ? -1 : pos);
       }
-  } static constexpr oo__find__oo{};*/
+  } static constexpr find{};
+
+  struct : method {
+    auto operator()(auto self, auto other) const {
+      return self->value.starts_with(other->value);
+    }
+  } static constexpr startswith{};
+
+  struct : method {
+    auto operator()(auto self, auto encoding = Obj(std::string("utf-8"))) const {
+      return Obj(self->value);
+    }
+  } static constexpr encode{};
 
   // format
   /*
@@ -208,12 +242,19 @@ struct TyStr__oo : classtype<_Base0, TyStr__oo<>> {
   } static constexpr format{};
 
   struct Obj : value<TyStr__oo<>, Obj> {
+    using value_type = std::string::value_type;
     std::string value;
 
     constexpr Obj() : value() {}
     constexpr Obj(std::string value) : value(value) {}
+    constexpr Obj(const char* value, size_t count) : value(value, count) {}
     operator std::string() const { return value; }
     operator std::string_view() const { return value; }
+
+    auto data() const { return value.data(); }
+    auto size() const { return value.size(); }
+
+    bool operator ==(const Obj &other) const { return value == other.value; }
   };
 
   auto operator()(std::string value) const { return Obj(value); }
@@ -226,6 +267,12 @@ inline constexpr auto operator""_ps(const char *s, size_t len) noexcept {
   return typon::TyStr__oo<>::Obj(std::string(s, len));
 }
 
+template <> struct std::hash<decltype(""_ps)> {
+  std::size_t operator()(const decltype(""_ps) &s) const noexcept {
+    return std::hash<std::string>()(s);
+  }
+};
+
 /*template <typename T> auto str(const T &x) { return dot(x, oo__str__oo)(); }
 
 template <typename T>
@@ -264,4 +311,11 @@ template <typename T> auto repr(const T &x) {
   }
 }
 
+namespace PYBIND11_NAMESPACE {
+namespace detail {
+template<>
+struct type_caster<decltype(""_ps)>
+    : string_caster<decltype(""_ps)> {};
+}}
+
 #endif // TYPON_STR_HPP

runtime @ f58767e0

-Subproject commit 76287636438cf0a82701102ccb8014c66ea88506
+Subproject commit f58767e045d32aaaed44c68082220e08c481c159

typon/trans/stdlib/builtins_.py

@@ -49,7 +49,8 @@ class Iterable[U](Protocol):
 class str:
     def find(self, sub: Self) -> int: ...
     def format(self, *args) -> Self: ...
-    def encode(self, encoding: Self) -> bytes: ...
+    def encode(self, encoding: Self) -> Self: ... # TODO: bytes
+    def decode(self, encoding: Self) -> Self: ...
     def __len__(self) -> int: ...
     def __add__(self, other: Self) -> Self: ...
     def __mul__(self, other: int) -> Self: ...

typon/trans/tests/webserver_eval.py

@@ -3,8 +3,7 @@
 
 import sys
 from socket import socket, SOCK_STREAM, AF_INET6, SOL_SOCKET, SO_REUSEADDR
-from typon import fork
-from builtins import eval
+from python.builtins import eval
 #fork = lambda x: x()
 
 BACKLOG = 1024
@@ -25,21 +24,24 @@ def create_listening_socket(port):
     return sockfd
 
 def handle_connection(connfd):
-    buf = connfd.recv(1024).decode("utf-8")
+    buf: str = connfd.recv(1024).decode("utf-8")
     resp: str
     if not buf.startswith("GET /eval?e="):
         resp = "Expression missing"
     else:
         http_pos = buf.find("HTTP/1.1\r\n")
         s = "str(" + buf[12:http_pos-1] + ")"
-        resp = eval(s, {"req": buf})
+        #resp = eval(s, {"req": buf})
+        context = {"req": buf}
+        resp = eval(s, context)
     response = response_fmt.format(len(resp), resp)
     connfd.send(response.encode("utf-8"))
     connfd.close()
 
 def server_loop(sockfd):
     while True:
-        connfd, _ = sockfd.accept()
+        #connfd, _ = sockfd.accept()
+        connfd = sockfd.accept()[0]
 
         fork(lambda: handle_connection(connfd))
 

typon/trans/transpiler/phases/emit_cpp/expr.py

@@ -345,19 +345,18 @@ class ExpressionVisitor(NodeVisitor):
 
     def visit_Dict(self, node: ast.Dict) -> Iterable[str]:
         def visit_item(key, value):
-            yield "std::pair {"
+            yield "{"
             yield from self.visit(key)
             yield ", "
             yield from self.visit(value)
             yield "}"
 
         if node.keys:
-            #yield from self.visit(node.type)
-            yield "typon::TyDict("
-            yield "{"
+            yield from self.visit(node.type)
+            #yield "typon::TyDict("
+            yield "({"
             yield from join(", ", map(visit_item, node.keys, node.values))
-            yield "}"
-            yield ")"
+            yield "})"
         else:
             yield from self.visit(node.type)
             yield "{}"
@@ -394,8 +393,10 @@ class ExpressionVisitor(NodeVisitor):
     def visit_unary_operation(self, op, operand) -> Iterable[str]:
         if type(op) != str:
             op = SYMBOLS[type(op)]
+        yield "("
         yield op
-        yield from self.prec("unary").visit(operand)
+        yield from self.visit(operand)
+        yield ")"
 
     def visit_IfExp(self, node: ast.IfExp) -> Iterable[str]:
         yield "("

typon/trans/transpiler/phases/emit_cpp/function.py

@@ -38,11 +38,16 @@ def emit_function(name: str, func: CallableInstanceType, base="function", gen_p=
             yield rty
         yield " {"
         for var, initval in func.block_data.scope.root_decls.items():
-            yield "typename std::remove_reference<decltype(" # TODO: duplicate code in visit_lvalue
-            yield from ExpressionVisitor(func.block_data.scope, mode).visit(initval)
-            yield ")>::type"
+            __TB_NODE__ = initval
+            if isinstance(initval, BaseType):
+                yield from NodeVisitor().visit_BaseType(initval)
+            else:
+                yield "typename std::remove_reference<decltype(" # TODO: duplicate code in visit_lvalue
+                yield from ExpressionVisitor(func.block_data.scope, mode).visit(initval)
+                yield ")>::type"
             yield var
             yield ";"
+        __TB_NODE__ = func.block_data.node
         vis = BlockVisitor(func.block_data.scope, generator=mode)
         for stmt in func.block_data.node.body:
             yield from vis.visit(stmt)

typon/trans/transpiler/phases/emit_cpp/module.py

@@ -2,11 +2,13 @@ import ast
 from typing import Iterable
 
 from transpiler.phases.emit_cpp.class_ import emit_class
-from transpiler.phases.emit_cpp.function import emit_function
-from transpiler.phases.emit_cpp.visitors import NodeVisitor
+from transpiler.phases.emit_cpp.expr import ExpressionVisitor
+from transpiler.phases.emit_cpp.function import emit_function, BlockVisitor
+from transpiler.phases.emit_cpp.visitors import NodeVisitor, CoroutineMode
 from transpiler.phases.typing.modules import ModuleType, TyponModuleType, PythonModuleType
 from transpiler.phases.typing.types import CallableInstanceType, ClassTypeType, TypeVariable, BaseType, GenericType, \
-    GenericInstanceType, UserGenericType
+    GenericInstanceType, UserGenericType, RuntimeValue
+from transpiler.utils import linenodata
 
 
 def emit_module(mod: ModuleType) -> Iterable[str]:
@@ -24,7 +26,7 @@ def emit_module(mod: ModuleType) -> Iterable[str]:
             case TyponModuleType():
                 yield f"#include <python/{name}.hpp>"
             case PythonModuleType():
-                yield f"namespace py_{name} {{"
+                yield f"namespace py_python_{name} {{"
 
                 yield "template <typename _Unused = void>"
                 yield f"struct {name}__oo : referencemodel::moduletype<{name}__oo<>> {{"
@@ -75,24 +77,43 @@ def emit_module(mod: ModuleType) -> Iterable[str]:
             case ast.Import(names):
                 for alias in names:
                     yield from emit(alias.module_obj)
-                    incl_vars.append(f"auto& {alias.asname or alias.name} = py_{alias.name}::all;")
+                    prefix = "python_" if isinstance(alias.module_obj, PythonModuleType) else ""
+                    incl_vars.append(f"auto& {alias.asname or alias.name} = py_{prefix}{alias.module_obj.name()}::all;")
             case ast.ImportFrom(module, names, _):
                 yield from emit(node.module_obj)
+                prefix = "python_" if isinstance(node.module_obj, PythonModuleType) else ""
                 for alias in names:
-                    incl_vars.append(f"auto& {alias.asname or alias.name} = py_{module}::all.{alias.name};")
+                    if isinstance(node.module_obj, PythonModuleType):
+                        if isinstance(node.module_obj.fields[alias.name].type.resolve(), TypeVariable):
+                            continue # unused function
+                    incl_vars.append(f"auto& {alias.asname or alias.name} = py_{prefix}{node.module_obj.name()}::all.{alias.name};")
     yield "namespace PROGRAMNS {"
     yield from incl_vars
     yield "template <typename _Unused = void>"
     yield f"struct {mod.name()}__oo : referencemodel::moduletype<{mod.name()}__oo<>>"
     yield "{"
+    init_lines = []
     for name, field in mod.fields.items():
         if not field.in_class_def:
             continue
 
-        if isinstance(field.type, ClassTypeType):
-            ty = field.type.inner_type
-        else:
-            ty = field.type
+        ty = field.type
+
+        if isinstance(field.from_node, ast.Assign):
+            yield "static inline"
+            yield from NodeVisitor().visit_BaseType(field.from_node.value.type)
+            yield name
+            yield "="
+            yield from ExpressionVisitor(mod.block_data.scope, CoroutineMode.SYNC).visit(field.from_node.value)
+            yield ";"
+            # if not isinstance(field.from_node.value, RuntimeValue):
+            #     assign_node = ast.Assign([ast.Name(name)], field.from_node.value, None, **linenodata(field.from_node))
+            #     assign_node.is_declare = None
+            #     init_lines.append(BlockVisitor(mod.block_data.scope).visit(assign_node))
+            continue
+
+        if isinstance(ty, ClassTypeType):
+            ty = ty.inner_type
 
         gen_p = [TypeVariable(p.name, emit_as_is=True) for p in ty.parameters]
         ty = ty.instantiate(gen_p)
@@ -109,7 +130,12 @@ def emit_module(mod: ModuleType) -> Iterable[str]:
             case _:
                 raise NotImplementedError(f"Unsupported module item type {ty}")
 
+    yield f"{mod.name()}__oo() {{"
+    for line in init_lines:
+        yield from line
+    yield "}"
+
     yield "};"
-    yield f"constexpr {mod.name()}__oo<> {mod.name()};"
+    yield f"{mod.name()}__oo<> {mod.name()};"
     yield f"static_assert(sizeof {mod.name()} == 1);"
     yield "}"

typon/trans/transpiler/phases/emit_cpp/visitors.py

@@ -73,6 +73,8 @@ class NodeVisitor(UniversalVisitor):
                 yield 'decltype(""_ps)'
             case types.TY_LIST:
                 yield "typon::TyList__oo<>::Obj"
+            case types.TY_DICT:
+                yield "typon::TyDict__oo<>::Obj"
             case types.TypeVariable(name, emit_as_is=em, decltype_str=dt):
                 if em:
                     yield name

typon/trans/transpiler/phases/typing/block.py

@@ -115,8 +115,10 @@ class ScoperBlockVisitor(ScoperVisitor):
                 # return True
                 val = val or RuntimeValue()
                 self.scope.function.vars[target.id] = VarDecl(VarKind.LOCAL, decl_val, val)
-                if self.scope.kind == ScopeKind.FUNCTION_INNER:
-                    self.scope.function.root_decls[target.id] = val
+                #if self.scope.kind == ScopeKind.FUNCTION_INNER:
+                #if not isinstance(val, RuntimeValue):
+                if True:
+                    self.scope.function.root_decls[target.id] = val if not isinstance(val, RuntimeValue) else decl_val
                     return False
                 return True
         elif isinstance(target, ast.Tuple):

typon/trans/transpiler/phases/typing/expr.py

@@ -322,11 +322,14 @@ class ScoperExprVisitor(ScoperVisitor):
     def visit_Dict(self, node: ast.Dict) -> BaseType:
         if not node.keys:
             return TY_DICT.instantiate_default()
-        keys = [self.visit(e) for e in node.keys]
-        values = [self.visit(e) for e in node.values]
-        if len(set(keys)) != 1 or len(set(values)) != 1:
-            raise NotImplementedError(f"Dict with different types not handled yet in `{ast.unparse(node)}`")
-        return TY_DICT.instantiate([keys[0], values[0]])
+        key_type = TypeVariable()
+        value_type = TypeVariable()
+        for k, v in zip(node.keys, node.values):
+            if not key_type.try_assign(self.visit(k)):
+                raise NotImplementedError(f"Dict with different key types not handled yet in `{ast.unparse(node)}`")
+            if not value_type.try_assign(self.visit(v)):
+                raise NotImplementedError(f"Dict with different value types not handled yet in `{ast.unparse(node)}`")
+        return TY_DICT.instantiate([key_type, value_type])
 
     def visit_Subscript(self, node: ast.Subscript) -> BaseType:
         left = self.visit(node.value)

typon/trans/transpiler/phases/typing/modules.py

@@ -23,7 +23,7 @@ def make_module(name: str, scope: Scope) -> TyponModuleType:
             return name
     ty = CreatedType()
     for n, v in scope.vars.items():
-        ty.fields[n] = MemberDef(v.type, v.val, v.is_item_decl)
+        ty.fields[n] = MemberDef(v.type, v.val, v.is_item_decl, v.from_node)
     return ty
 
 visited_modules = {}
@@ -62,6 +62,8 @@ def parse_module(mod_name: str, python_path: list[Path], scope=None, preprocess=
         
         
         """
+        if mod_name.startswith("python."):
+            mod_name = mod_name[len("python."):]
         try:
             py_mod = importlib.import_module(mod_name)
         except ModuleNotFoundError:

typon/trans/transpiler/phases/typing/scope.py

@@ -29,6 +29,7 @@ class VarDecl:
     type: BaseType
     val: Any = RuntimeValue()
     is_item_decl: bool = False
+    from_node: ast.AST = None
 
 
 class ScopeKind(Enum):

typon/trans/transpiler/phases/typing/stdlib.py

@@ -102,7 +102,11 @@ class StdlibVisitor(NodeVisitorSeq):
             self.visit(stmt)
 
     def visit_Assign(self, node: ast.Assign):
-        self.scope.vars[node.targets[0].id] = VarDecl(VarKind.LOCAL, self.anno().visit(node.value).type_type())
+        if self.is_native:
+            decl = VarDecl(VarKind.LOCAL, self.anno().visit(node.value).type_type())
+        else:
+            decl = VarDecl(VarKind.LOCAL, self.expr().visit(node.value), is_item_decl=True, from_node=node)
+        self.scope.vars[node.targets[0].id] = decl
 
     def visit_AnnAssign(self, node: ast.AnnAssign):
         ty = self.anno().visit(node.annotation)

typon/trans/transpiler/phases/typing/types.py

@@ -24,6 +24,7 @@ class MemberDef:
     type: "BaseType"
     val: typing.Any = RuntimeValue()
     in_class_def: bool = True
+    from_node: ast.AST = None
 
 @dataclass
 class UnifyMode:

typon/trans/we2.cpp

+#include <python/builtins.hpp>
+#include <python/socket.hpp>
+#include <python/sys.hpp>
+namespace py_python_builtins {
+template <typename _Unused = void>
+struct builtins__oo : referencemodel::moduletype<builtins__oo<>> {
+  struct : referencemodel::function {
+    auto
+    operator()(lvalue_or_rvalue<decltype(""_ps)> arg0,
+               lvalue_or_rvalue<
+                   typon::TyDict__oo<>::Obj<decltype(""_ps), decltype(""_ps)>>
+                   arg1) const {
+      InterpGuard guard{};
+      try {
+        return py::module_::import("builtins")
+            .attr("eval")(*arg0, *arg1)
+            .cast<decltype(""_ps)>();
+      } catch (py::error_already_set &e) {
+        std::cerr << "Python exception: " << e.what() << std::endl;
+        throw;
+      }
+    }
+  } static constexpr eval{};
+};
+builtins__oo<> all;
+} // namespace py_python_builtins
+namespace PROGRAMNS {
+auto &sys = py_sys::all;
+auto &socket = py_socket::all.socket;
+auto &SOCK_STREAM = py_socket::all.SOCK_STREAM;
+auto &AF_INET6 = py_socket::all.AF_INET6;
+auto &SOL_SOCKET = py_socket::all.SOL_SOCKET;
+auto &SO_REUSEADDR = py_socket::all.SO_REUSEADDR;
+auto &eval = py_python_builtins::all.eval;
+template <typename _Unused = void>
+struct webserver_eval__oo : referencemodel::moduletype<webserver_eval__oo<>> {
+  static decltype(0_pi) BACKLOG;
+  static decltype(0_pi) PORT;
+  static decltype(""_ps) response_fmt;
+  struct : referencemodel::function {
+    template <typename AutoVar$9120453574589009546 = void,
+              typename AutoVar$return = void>
+    auto typon$$sync(AutoVar$9120453574589009546 port) const {
+      auto sockfd = call_sync(socket)(AF_INET6, SOCK_STREAM);
+      call_sync(dot((sockfd), setsockopt))(SOL_SOCKET, SO_REUSEADDR, 1_pi);
+      call_sync(dot((sockfd), bind))(std::make_tuple(""_ps, port));
+      call_sync(dot((sockfd), listen))(BACKLOG);
+      return sockfd;
+    }
+    using has_sync = std::true_type;
+    template <typename AutoVar$9120453574589009546 = void,
+              typename AutoVar$return = void>
+    auto operator()(AutoVar$9120453574589009546 port) const
+        -> typon::Task<decltype(typon$$sync(port))> {
+      auto sockfd = co_await (socket)(AF_INET6, SOCK_STREAM);
+      co_await (dot((sockfd), setsockopt))(SOL_SOCKET, SO_REUSEADDR, 1_pi);
+      co_await (dot((sockfd), bind))(std::make_tuple(""_ps, port));
+      co_await (dot((sockfd), listen))(BACKLOG);
+      co_return sockfd;
+    }
+  } static constexpr create_listening_socket{};
+  static_assert(HasSync<decltype(create_listening_socket)>);
+  static_assert(sizeof create_listening_socket == 1);
+  struct : referencemodel::function {
+    template <typename AutoVar$1818216228010231424 = void,
+              typename AutoVar$return = void>
+    auto operator()(AutoVar$1818216228010231424 connfd) const
+        -> typon::Task<typon::TyNone> {
+      auto buf = co_await (dot((co_await (dot((connfd), recv))(1024_pi)), decode))(
+          "utf-8"_ps);
+      if ((!co_await (dot((buf), startswith))("GET /eval?e="_ps))) {
+        auto resp = "Expression missing"_ps;
+      } else
+      {
+        auto http_pos = co_await (dot((buf), find))("HTTP/1.1\r\n"_ps);
+        auto s = ( (( ("str("_ps
+
+                                  +
+
+                                  ( dot(buf, oo__getitem__oo)(
+                                      typon::TySlice(12_pi,
+                                                     ( (http_pos
+
+                                                                -
+
+                                                                1_pi)),
+                                                     None)))))
+
+                       +
+
+                       ")"_ps));
+        //auto resp = co_await (eval)(s, typon::TyDict({std::pair{"req"_ps, buf}}));
+      }
+      co_return None;
+    }
+  } static constexpr handle_connection{};
+  static_assert(sizeof handle_connection == 1);
+  struct : referencemodel::function {
+    template <typename AutoVar$1872507998259318362 = void,
+              typename AutoVar$return = void>
+    auto operator()(AutoVar$1872507998259318362 sockfd) const
+        -> typon::Join<typon::TyNone> {
+      while (typon::TyBool(true)) {
+        auto connfd = (co_await typon::constant_get<0>(
+            co_await (dot((sockfd), accept))()));
+        co_await typon::fork(handle_connection(connfd));
+      }
+      co_return None;
+    }
+  } static constexpr server_loop{};
+  static_assert(sizeof server_loop == 1);
+  struct : referencemodel::function {
+    template <typename AutoVar$return = void>
+    auto operator()() const -> typon::Task<typon::TyNone> {
+
+      co_await (print)("Serving on port"_ps, PORT);
+      co_await (print)();
+      auto sockfd = co_await (create_listening_socket)(PORT);
+      co_await (server_loop)(sockfd);
+      co_return None;
+    }
+  } static constexpr main{};
+  static_assert(sizeof main == 1);
+  webserver_eval__oo() {
+    BACKLOG = 1024_pi;
+    PORT = 8000_pi;
+    response_fmt =
+        "HTTP/1.0 200 OK\r\nContent-type: text/plain\r\nContent-length: {}\r\n\r\n{}"_ps;
+  }
+};
+webserver_eval__oo<> webserver_eval;
+static_assert(sizeof webserver_eval == 1);
+} // namespace PROGRAMNS
+#ifdef TYPON_EXTENSION
+#else
+typon::Root root() { co_await dot(PROGRAMNS::webserver_eval, main)(); }
+int main(int argc, char *argv[]) {
+  py_sys::all.argv = typon::TyList__oo<>::Obj(
+      std::vector<typon::TyStr__oo<>::Obj>(argv, argv + argc));
+  root().call();
+}
+#endif
\ No newline at end of file