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Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.
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# copyright 2004-2005 Samuele Pedroni
define: (ClassBodyDeclarations)typeinfo0

  /* type info */

  `basic;

define: (ClassBodyDeclarations)typeinfo1

  public static void typeSetup(PyObject dict, PyType.Newstyle marker) {
    `setup;
  }

define: (BlockStatements)pair
  `trailer;
  `last;
define: getset
    dict.__setitem__(
            `strfy`(`name),
            new PyGetSetDescr(`strfy`(`name), `typ.class, `get, `set, `del));

define: (ClassBodyDeclarations)call_cmeths args body
    public PyObject __call__(`args) {
        `body;
    }

define: (ClassBodyDeclarations)call_meths args body
    public PyObject __call__(`args) {
        `body;
    }

define: expose_wide_meth
        class `concat`(exposed_,`name) extends PyBuiltinMethod {

            `concat`(exposed_,`name)(PyObject self, PyBuiltinFunction.Info info) {
                super(self, info);
            }

            public PyBuiltinFunction bind(PyObject self) {
                return new `concat`(exposed_,`name)(self, info);
            }

            public PyObject __call__(PyObject[] args) {
                 return __call__(args,Py.NoKeywords);
            }

            `call_meths;

        }

        dict.__setitem__(
            `strfy`(`name),
            new PyMethodDescr(
                `strfy`(`name),
                `typ.class,
                `minargs,
                `maxargs,
                new `concat`(exposed_,`name)(null, null)));

define: expose_narrow_meth typ name minargs maxargs call_meths
        class `concat`(exposed_,`name) extends PyBuiltinMethodNarrow {

            `concat`(exposed_,`name)(PyObject self, PyBuiltinFunction.Info info) {
                super(self, info);
            }

            public PyBuiltinFunction bind(PyObject self) {
                return new `concat`(exposed_,`name)(self, info);
            }

            `call_meths;

        }

        dict.__setitem__(
            `strfy`(`name),
            new PyMethodDescr(
                `strfy`(`name),
                `typ.class,
                `minargs,
                `maxargs,
                new `concat`(exposed_,`name)(null, null)));    

define: expose_narrow_cmeth typ name minargs maxargs call_meths
        class `concat`(exposed_,`name) extends PyBuiltinMethodNarrow {

            `concat`(exposed_,`name)(PyObject self, PyBuiltinFunction.Info info) {
                super(self, info);
            }

            public PyBuiltinFunction bind(PyObject self) {
                return new `concat`(exposed_,`name)(self, info);
            }

            `call_meths;

        }

        dict.__setitem__(
            `strfy`(`name),
            new PyClassMethodDescr(
                `strfy`(`name),
                `typ.class,
                `minargs,
                `maxargs,
                new `concat`(exposed_,`name)(null, null)));    

define: conv_error_handling unsafe_body
     try {
         `unsafe_body;
     } catch(PyObject.ConversionException e) {
         String msg;
         switch(e.index) {
         case `cases;
         default:
           msg = "xxx";   
         }
         throw Py.TypeError(msg);
     }
define: key_getitem
   PyObject ret = `deleg`(__finditem__);
   if (ret == null)
       throw Py.KeyError(`arg0.toString());
   return ret;
define: index_getitem
   PyObject ret = `deleg`(__finditem__);
   if (ret == null) {
       throw Py.IndexError("index out of range: "+`arg0);
   }
   return ret;
define: vanilla_cmp deleg_prefix
  int ret = ((`typ)self).`concat`(`deleg_prefix,__cmp__)(`arg0); 
  if (ret == -2) {
    throw Py.TypeError(`strfy`(`typname)+".__cmp__(x,y) requires y to be '"+
                       `strfy`(`typname)+"', not a '"+(`arg0).getType().fastGetName()+"'");
  }
  return Py.newInteger(ret);
define: vanilla_pow deleg_prefix
  PyObject ret =  ((`typ)self).`concat`(`deleg_prefix,__pow__)(`arg0,`arg1);  
  if (ret == null)
    return Py.NotImplemented;
  return ret;
define: unary deleg_prefix
  return ((`typ)self).`concat`(`deleg_prefix,`name)();
define: binary deleg_prefix
  PyObject ret =  ((`typ)self).`concat`(`deleg_prefix,`name)(`arg0);  
  if (ret == null)
    return Py.NotImplemented;
  return ret;
define: (Expression)deleg name deleg_prefix
  ((`typ)self).`concat`(`deleg_prefix,`name)(`all)
define: vdeleg: name deleg_prefix
  `deleg`(`name,`deleg_prefix);
define: rdeleg: name deleg_prefix
  return `deleg`(`name,`deleg_prefix);
define: ideleg: name deleg_prefix
  return Py.newInteger(`deleg`(`name,`deleg_prefix));
define: ldeleg: name deleg_prefix
  return new PyLong(`deleg`(`name,`deleg_prefix));
define: bdeleg: name deleg_prefix
  return Py.newBoolean(`deleg`(`name,`deleg_prefix));
define: sdeleg: name deleg_prefix
  return new PyString(`deleg`(`name,`deleg_prefix));
define: udeleg: name deleg_prefix
  return new PyUnicode(`deleg`(`name,`deleg_prefix));
define: void:
  return Py.None;
define: expose_new
       dict
            .__setitem__(
                "__new__",
                new PyNewWrapper(`typ.class, "__new__", `minargs, `maxargs) {
            public PyObject new_impl(
                boolean init,
                PyType subtype,
                PyObject[] args,
                String[] keywords) {
                `body;
            }
        });

define: mutable_new_body
                `typ newobj;
                if (for_type == subtype) {
                    newobj = new `typ();
                    if (init) newobj.`concat`(`typname,_init)(args,keywords);
                } else {
                    newobj = new `concat`(`typ,Derived)(subtype);
                }
                return newobj;
define: immutable_new_body
                return `concat`(`typname,_new)(this,init,subtype,args,keywords);