Re-organize directory structure (#4971)

See discussion in #2491

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>

stdlib/_codecs.pyi

@@ -0,0 +1,82 @@
+import codecs
+import sys
+from typing import Any, Callable, Dict, Optional, Text, Tuple, Union
+
+# For convenience:
+_Handler = Callable[[Exception], Tuple[Text, int]]
+_String = Union[bytes, str]
+_Errors = Union[str, Text, None]
+if sys.version_info < (3, 0):
+    _Decodable = Union[bytes, Text]
+    _Encodable = Union[bytes, Text]
+else:
+    _Decodable = bytes
+    _Encodable = str
+
+# This type is not exposed; it is defined in unicodeobject.c
+class _EncodingMap(object):
+    def size(self) -> int: ...
+
+_MapT = Union[Dict[int, int], _EncodingMap]
+
+def register(__search_function: Callable[[str], Any]) -> None: ...
+def register_error(__errors: Union[str, Text], __handler: _Handler) -> None: ...
+def lookup(__encoding: Union[str, Text]) -> codecs.CodecInfo: ...
+def lookup_error(__name: Union[str, Text]) -> _Handler: ...
+def decode(obj: Any, encoding: Union[str, Text] = ..., errors: _Errors = ...) -> Any: ...
+def encode(obj: Any, encoding: Union[str, Text] = ..., errors: _Errors = ...) -> Any: ...
+def charmap_build(__map: Text) -> _MapT: ...
+def ascii_decode(__data: _Decodable, __errors: _Errors = ...) -> Tuple[Text, int]: ...
+def ascii_encode(__str: _Encodable, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+
+if sys.version_info < (3, 2):
+    def charbuffer_encode(__data: _Encodable, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+
+def charmap_decode(__data: _Decodable, __errors: _Errors = ..., __mapping: Optional[_MapT] = ...) -> Tuple[Text, int]: ...
+def charmap_encode(__str: _Encodable, __errors: _Errors = ..., __mapping: Optional[_MapT] = ...) -> Tuple[bytes, int]: ...
+def escape_decode(__data: _String, __errors: _Errors = ...) -> Tuple[str, int]: ...
+def escape_encode(__data: bytes, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+def latin_1_decode(__data: _Decodable, __errors: _Errors = ...) -> Tuple[Text, int]: ...
+def latin_1_encode(__str: _Encodable, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+def raw_unicode_escape_decode(__data: _String, __errors: _Errors = ...) -> Tuple[Text, int]: ...
+def raw_unicode_escape_encode(__str: _Encodable, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+def readbuffer_encode(__data: _String, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+def unicode_escape_decode(__data: _String, __errors: _Errors = ...) -> Tuple[Text, int]: ...
+def unicode_escape_encode(__str: _Encodable, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+
+if sys.version_info < (3, 8):
+    def unicode_internal_decode(__obj: _String, __errors: _Errors = ...) -> Tuple[Text, int]: ...
+    def unicode_internal_encode(__obj: _String, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+
+def utf_16_be_decode(__data: _Decodable, __errors: _Errors = ..., __final: int = ...) -> Tuple[Text, int]: ...
+def utf_16_be_encode(__str: _Encodable, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+def utf_16_decode(__data: _Decodable, __errors: _Errors = ..., __final: int = ...) -> Tuple[Text, int]: ...
+def utf_16_encode(__str: _Encodable, __errors: _Errors = ..., __byteorder: int = ...) -> Tuple[bytes, int]: ...
+def utf_16_ex_decode(
+    __data: _Decodable, __errors: _Errors = ..., __byteorder: int = ..., __final: int = ...
+) -> Tuple[Text, int, int]: ...
+def utf_16_le_decode(__data: _Decodable, __errors: _Errors = ..., __final: int = ...) -> Tuple[Text, int]: ...
+def utf_16_le_encode(__str: _Encodable, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+def utf_32_be_decode(__data: _Decodable, __errors: _Errors = ..., __final: int = ...) -> Tuple[Text, int]: ...
+def utf_32_be_encode(__str: _Encodable, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+def utf_32_decode(__data: _Decodable, __errors: _Errors = ..., __final: int = ...) -> Tuple[Text, int]: ...
+def utf_32_encode(__str: _Encodable, __errors: _Errors = ..., __byteorder: int = ...) -> Tuple[bytes, int]: ...
+def utf_32_ex_decode(
+    __data: _Decodable, __errors: _Errors = ..., __byteorder: int = ..., __final: int = ...
+) -> Tuple[Text, int, int]: ...
+def utf_32_le_decode(__data: _Decodable, __errors: _Errors = ..., __final: int = ...) -> Tuple[Text, int]: ...
+def utf_32_le_encode(__str: _Encodable, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+def utf_7_decode(__data: _Decodable, __errors: _Errors = ..., __final: int = ...) -> Tuple[Text, int]: ...
+def utf_7_encode(__str: _Encodable, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+def utf_8_decode(__data: _Decodable, __errors: _Errors = ..., __final: int = ...) -> Tuple[Text, int]: ...
+def utf_8_encode(__str: _Encodable, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+
+if sys.platform == "win32":
+    def mbcs_decode(__data: _Decodable, __errors: _Errors = ..., __final: int = ...) -> Tuple[Text, int]: ...
+    def mbcs_encode(__str: _Encodable, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+    if sys.version_info >= (3, 0):
+        def code_page_decode(__codepage: int, __data: bytes, __errors: _Errors = ..., __final: int = ...) -> Tuple[Text, int]: ...
+        def code_page_encode(__code_page: int, __str: Text, __errors: _Errors = ...) -> Tuple[bytes, int]: ...
+    if sys.version_info >= (3, 6):
+        def oem_decode(__data: bytes, __errors: _Errors = ..., __final: int = ...) -> Tuple[Text, int]: ...
+        def oem_encode(__str: Text, __errors: _Errors = ...) -> Tuple[bytes, int]: ...