from pypy.interpreter.mixedmodule import MixedModule
from pypy.interpreter.error import OperationError
from pypy.rlib.objectmodel import we_are_translated
import sys

_WIN = sys.platform == 'win32'

class Module(MixedModule):
    """Sys Builtin Module. """
    _immutable_fields_ = ["defaultencoding?"]

    def __init__(self, space, w_name):
        """NOT_RPYTHON""" # because parent __init__ isn't
        if space.config.translating:
            del self.__class__.interpleveldefs['pypy_getudir']
        super(Module, self).__init__(space, w_name) 
        self.recursionlimit = 100
        self.w_default_encoder = None
        self.defaultencoding = "ascii"
        self.filesystemencoding = None

    interpleveldefs = {
        '__name__'              : '(space.wrap("sys"))', 
        '__doc__'               : '(space.wrap("PyPy sys module"))', 

        'platform'              : 'space.wrap(sys.platform)', 
        'maxint'                : 'space.wrap(sys.maxint)',
        'maxsize'               : 'space.wrap(sys.maxint)',
        'byteorder'             : 'space.wrap(sys.byteorder)', 
        'maxunicode'            : 'space.wrap(vm.MAXUNICODE)',
        'stdin'                 : 'state.getio(space).w_stdin',
        '__stdin__'             : 'state.getio(space).w_stdin',
        'stdout'                : 'state.getio(space).w_stdout',
        '__stdout__'            : 'state.getio(space).w_stdout',
        'stderr'                : 'state.getio(space).w_stderr',
        '__stderr__'            : 'state.getio(space).w_stderr',
        'pypy_objspaceclass'    : 'space.wrap(repr(space))',
        #'prefix'               : # added by pypy_initial_path() when it 
        #'exec_prefix'          : # succeeds, pointing to trunk or /usr
        'path'                  : 'state.get(space).w_path',
        'modules'               : 'state.get(space).w_modules', 
        'argv'                  : 'state.get(space).w_argv',
        'py3kwarning'           : 'space.w_False',
        'warnoptions'           : 'state.get(space).w_warnoptions', 
        'builtin_module_names'  : 'space.w_None',
        'pypy_getudir'          : 'state.pypy_getudir',    # not translated
        'pypy_initial_path'     : 'state.pypy_initial_path',

        '_getframe'             : 'vm._getframe', 
        '_current_frames'       : 'currentframes._current_frames', 
        'setrecursionlimit'     : 'vm.setrecursionlimit', 
        'getrecursionlimit'     : 'vm.getrecursionlimit', 
        'setcheckinterval'      : 'vm.setcheckinterval', 
        'getcheckinterval'      : 'vm.getcheckinterval', 
        'exc_info'              : 'vm.exc_info', 
        'exc_clear'             : 'vm.exc_clear', 
        'settrace'              : 'vm.settrace',
        'gettrace'              : 'vm.gettrace',
        'setprofile'            : 'vm.setprofile',
        'getprofile'            : 'vm.getprofile',
        'call_tracing'          : 'vm.call_tracing',
        'getsizeof'             : 'vm.getsizeof',
        
        'executable'            : 'space.wrap("py.py")', 
        'api_version'           : 'version.get_api_version(space)',
        'version_info'          : 'version.get_version_info(space)',
        'version'               : 'version.get_version(space)',
        'pypy_version_info'     : 'version.get_pypy_version_info(space)',
        'subversion'            : 'version.get_subversion_info(space)',
        '_mercurial'            : 'version.get_repo_info(space)',
        'hexversion'            : 'version.get_hexversion(space)',

        'displayhook'           : 'hook.displayhook', 
        '__displayhook__'       : 'hook.__displayhook__', 
        'meta_path'             : 'space.wrap([])',
        'path_hooks'            : 'space.wrap([])',
        'path_importer_cache'   : 'space.wrap({})',
        'dont_write_bytecode'   : 'space.w_False',
        
        'getdefaultencoding'    : 'interp_encoding.getdefaultencoding', 
        'setdefaultencoding'    : 'interp_encoding.setdefaultencoding',
        'getfilesystemencoding' : 'interp_encoding.getfilesystemencoding',

        'float_info'            : 'system.get_float_info(space)',
        'long_info'             : 'system.get_long_info(space)',
        'float_repr_style'      : 'system.get_float_repr_style(space)'
        }

    if sys.platform == 'win32':
        interpleveldefs['winver'] = 'version.get_winver(space)'
        interpleveldefs['getwindowsversion'] = 'vm.getwindowsversion'
    
    appleveldefs = {
        'excepthook'            : 'app.excepthook', 
        '__excepthook__'        : 'app.excepthook', 
        'exit'                  : 'app.exit', 
        'exitfunc'              : 'app.exitfunc',
        'callstats'             : 'app.callstats',
        'copyright'             : 'app.copyright_str',
        'flags'                 : 'app.null_sysflags',
    }

    def setbuiltinmodule(self, w_module, name): 
        w_name = self.space.wrap(name)
        w_modules = self.get('modules')
        self.space.setitem(w_modules, w_name, w_module)

    def startup(self, space):
        if space.config.translating and not we_are_translated():
            # don't get the filesystemencoding at translation time
            assert self.filesystemencoding is None

        else:
            if _WIN:
                from pypy.module.sys import vm
                w_handle = vm.get_dllhandle(space)
                space.setitem(self.w_dict, space.wrap("dllhandle"), w_handle)

    def getmodule(self, name):
        space = self.space
        w_modules = self.get('modules') 
        try: 
            return space.getitem(w_modules, space.wrap(name))
        except OperationError, e: 
            if not e.match(space, space.w_KeyError): 
                raise 
            return None 

    def setmodule(self, w_module): 
        space = self.space
        w_name = self.space.getattr(w_module, space.wrap('__name__'))
        w_modules = self.get('modules')
        self.space.setitem(w_modules, w_name, w_module)

    def getdictvalue(self, space, attr):
        """ specialize access to dynamic exc_* attributes. """ 
        value = MixedModule.getdictvalue(self, space, attr) 
        if value is not None: 
            return value
        if attr == 'exc_type':
            operror = space.getexecutioncontext().sys_exc_info()
            if operror is None:
                return space.w_None
            else:
                return operror.w_type
        elif attr == 'exc_value':
            operror = space.getexecutioncontext().sys_exc_info()
            if operror is None:
                return space.w_None
            else:
                return operror.get_w_value(space)
        elif attr == 'exc_traceback':
            operror = space.getexecutioncontext().sys_exc_info()
            if operror is None:
                return space.w_None
            else:
                return space.wrap(operror.get_traceback())
        return None 

    def get_w_default_encoder(self):
        if self.w_default_encoder is not None:
            # XXX is this level of caching ok?  CPython has some shortcuts
            # for common encodings, but as far as I can see it has no general
            # cache.
            return self.w_default_encoder
        else:
            from pypy.module.sys.interp_encoding import get_w_default_encoder
            return get_w_default_encoder(self.space)

    def get_flag(self, name):
        space = self.space
        return space.int_w(space.getattr(self.get('flags'), space.wrap(name)))

    def get_state(self, space):
        from pypy.module.sys import state
        return state.get(space)
