Upgrade chardet to 5.1.0

37 files changed, 620 insertions, 287 deletions

diff --git a/news/chardet.vendor.rst b/news/chardet.vendor.rst
new file mode 100644
index 000000000..5aceb6c5e
--- /dev/null
+++ b/news/chardet.vendor.rst
@@ -0,0 +1 @@
+Upgrade chardet to 5.1.0
diff --git a/src/pip/_vendor/chardet.pyi b/src/pip/_vendor/chardet.pyi
deleted file mode 100644
index 29e87e331..000000000
--- a/src/pip/_vendor/chardet.pyi
+++ /dev/null
@@ -1 +0,0 @@
-from chardet import *
\ No newline at end of file
diff --git a/src/pip/_vendor/chardet/__init__.py b/src/pip/_vendor/chardet/__init__.py
index e91ad6182..fe581623d 100644
--- a/src/pip/_vendor/chardet/__init__.py
+++ b/src/pip/_vendor/chardet/__init__.py
@@ -15,19 +15,29 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from typing import List, Union
+
+from .charsetgroupprober import CharSetGroupProber
+from .charsetprober import CharSetProber
 from .enums import InputState
+from .resultdict import ResultDict
 from .universaldetector import UniversalDetector
 from .version import VERSION, __version__
 
 __all__ = ["UniversalDetector", "detect", "detect_all", "__version__", "VERSION"]
 
 
-def detect(byte_str):
+def detect(
+    byte_str: Union[bytes, bytearray], should_rename_legacy: bool = False
+) -> ResultDict:
     """
     Detect the encoding of the given byte string.
 
     :param byte_str:     The byte sequence to examine.
     :type byte_str:      ``bytes`` or ``bytearray``
+    :param should_rename_legacy:  Should we rename legacy encodings
+                                  to their more modern equivalents?
+    :type should_rename_legacy:   ``bool``
     """
     if not isinstance(byte_str, bytearray):
         if not isinstance(byte_str, bytes):
@@ -35,12 +45,16 @@ def detect(byte_str):
                 f"Expected object of type bytes or bytearray, got: {type(byte_str)}"
             )
         byte_str = bytearray(byte_str)
-    detector = UniversalDetector()
+    detector = UniversalDetector(should_rename_legacy=should_rename_legacy)
     detector.feed(byte_str)
     return detector.close()
 
 
-def detect_all(byte_str, ignore_threshold=False):
+def detect_all(
+    byte_str: Union[bytes, bytearray],
+    ignore_threshold: bool = False,
+    should_rename_legacy: bool = False,
+) -> List[ResultDict]:
     """
     Detect all the possible encodings of the given byte string.
 
@@ -50,6 +64,9 @@ def detect_all(byte_str, ignore_threshold=False):
                               ``UniversalDetector.MINIMUM_THRESHOLD``
                               in results.
     :type ignore_threshold:   ``bool``
+    :param should_rename_legacy:  Should we rename legacy encodings
+                                  to their more modern equivalents?
+    :type should_rename_legacy:   ``bool``
     """
     if not isinstance(byte_str, bytearray):
         if not isinstance(byte_str, bytes):
@@ -58,15 +75,15 @@ def detect_all(byte_str, ignore_threshold=False):
             )
         byte_str = bytearray(byte_str)
 
-    detector = UniversalDetector()
+    detector = UniversalDetector(should_rename_legacy=should_rename_legacy)
     detector.feed(byte_str)
     detector.close()
 
     if detector.input_state == InputState.HIGH_BYTE:
-        results = []
-        probers = []
+        results: List[ResultDict] = []
+        probers: List[CharSetProber] = []
         for prober in detector.charset_probers:
-            if hasattr(prober, "probers"):
+            if isinstance(prober, CharSetGroupProber):
                 probers.extend(p for p in prober.probers)
             else:
                 probers.append(prober)
@@ -80,6 +97,11 @@ def detect_all(byte_str, ignore_threshold=False):
                     charset_name = detector.ISO_WIN_MAP.get(
                         lower_charset_name, charset_name
                     )
+                # Rename legacy encodings with superset encodings if asked
+                if should_rename_legacy:
+                    charset_name = detector.LEGACY_MAP.get(
+                        charset_name.lower(), charset_name
+                    )
                 results.append(
                     {
                         "encoding": charset_name,
diff --git a/src/pip/_vendor/chardet/big5prober.py b/src/pip/_vendor/chardet/big5prober.py
index e4dfa7aa0..ef09c60e3 100644
--- a/src/pip/_vendor/chardet/big5prober.py
+++ b/src/pip/_vendor/chardet/big5prober.py
@@ -32,16 +32,16 @@ from .mbcssm import BIG5_SM_MODEL
 
 
 class Big5Prober(MultiByteCharSetProber):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.coding_sm = CodingStateMachine(BIG5_SM_MODEL)
         self.distribution_analyzer = Big5DistributionAnalysis()
         self.reset()
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
         return "Big5"
 
     @property
-    def language(self):
+    def language(self) -> str:
         return "Chinese"
diff --git a/src/pip/_vendor/chardet/chardistribution.py b/src/pip/_vendor/chardet/chardistribution.py
index 27b4a2939..176cb9964 100644
--- a/src/pip/_vendor/chardet/chardistribution.py
+++ b/src/pip/_vendor/chardet/chardistribution.py
@@ -25,6 +25,8 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from typing import Tuple, Union
+
 from .big5freq import (
     BIG5_CHAR_TO_FREQ_ORDER,
     BIG5_TABLE_SIZE,
@@ -59,22 +61,22 @@ class CharDistributionAnalysis:
     SURE_NO = 0.01
     MINIMUM_DATA_THRESHOLD = 3
 
-    def __init__(self):
+    def __init__(self) -> None:
         # Mapping table to get frequency order from char order (get from
         # GetOrder())
-        self._char_to_freq_order = tuple()
-        self._table_size = None  # Size of above table
+        self._char_to_freq_order: Tuple[int, ...] = tuple()
+        self._table_size = 0  # Size of above table
         # This is a constant value which varies from language to language,
         # used in calculating confidence.  See
         # http://www.mozilla.org/projects/intl/UniversalCharsetDetection.html
         # for further detail.
-        self.typical_distribution_ratio = None
-        self._done = None
-        self._total_chars = None
-        self._freq_chars = None
+        self.typical_distribution_ratio = 0.0
+        self._done = False
+        self._total_chars = 0
+        self._freq_chars = 0
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         """reset analyser, clear any state"""
         # If this flag is set to True, detection is done and conclusion has
         # been made
@@ -83,7 +85,7 @@ class CharDistributionAnalysis:
         # The number of characters whose frequency order is less than 512
         self._freq_chars = 0
 
-    def feed(self, char, char_len):
+    def feed(self, char: Union[bytes, bytearray], char_len: int) -> None:
         """feed a character with known length"""
         if char_len == 2:
             # we only care about 2-bytes character in our distribution analysis
@@ -97,7 +99,7 @@ class CharDistributionAnalysis:
                 if 512 > self._char_to_freq_order[order]:
                     self._freq_chars += 1
 
-    def get_confidence(self):
+    def get_confidence(self) -> float:
         """return confidence based on existing data"""
         # if we didn't receive any character in our consideration range,
         # return negative answer
@@ -114,12 +116,12 @@ class CharDistributionAnalysis:
         # normalize confidence (we don't want to be 100% sure)
         return self.SURE_YES
 
-    def got_enough_data(self):
+    def got_enough_data(self) -> bool:
         # It is not necessary to receive all data to draw conclusion.
         # For charset detection, certain amount of data is enough
         return self._total_chars > self.ENOUGH_DATA_THRESHOLD
 
-    def get_order(self, _):
+    def get_order(self, _: Union[bytes, bytearray]) -> int:
         # We do not handle characters based on the original encoding string,
         # but convert this encoding string to a number, here called order.
         # This allows multiple encodings of a language to share one frequency
@@ -128,13 +130,13 @@ class CharDistributionAnalysis:
 
 
 class EUCTWDistributionAnalysis(CharDistributionAnalysis):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self._char_to_freq_order = EUCTW_CHAR_TO_FREQ_ORDER
         self._table_size = EUCTW_TABLE_SIZE
         self.typical_distribution_ratio = EUCTW_TYPICAL_DISTRIBUTION_RATIO
 
-    def get_order(self, byte_str):
+    def get_order(self, byte_str: Union[bytes, bytearray]) -> int:
         # for euc-TW encoding, we are interested
         #   first  byte range: 0xc4 -- 0xfe
         #   second byte range: 0xa1 -- 0xfe
@@ -146,13 +148,13 @@ class EUCTWDistributionAnalysis(CharDistributionAnalysis):
 
 
 class EUCKRDistributionAnalysis(CharDistributionAnalysis):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self._char_to_freq_order = EUCKR_CHAR_TO_FREQ_ORDER
         self._table_size = EUCKR_TABLE_SIZE
         self.typical_distribution_ratio = EUCKR_TYPICAL_DISTRIBUTION_RATIO
 
-    def get_order(self, byte_str):
+    def get_order(self, byte_str: Union[bytes, bytearray]) -> int:
         # for euc-KR encoding, we are interested
         #   first  byte range: 0xb0 -- 0xfe
         #   second byte range: 0xa1 -- 0xfe
@@ -164,13 +166,13 @@ class EUCKRDistributionAnalysis(CharDistributionAnalysis):
 
 
 class JOHABDistributionAnalysis(CharDistributionAnalysis):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self._char_to_freq_order = EUCKR_CHAR_TO_FREQ_ORDER
         self._table_size = EUCKR_TABLE_SIZE
         self.typical_distribution_ratio = EUCKR_TYPICAL_DISTRIBUTION_RATIO
 
-    def get_order(self, byte_str):
+    def get_order(self, byte_str: Union[bytes, bytearray]) -> int:
         first_char = byte_str[0]
         if 0x88 <= first_char < 0xD4:
             code = first_char * 256 + byte_str[1]
@@ -179,13 +181,13 @@ class JOHABDistributionAnalysis(CharDistributionAnalysis):
 
 
 class GB2312DistributionAnalysis(CharDistributionAnalysis):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self._char_to_freq_order = GB2312_CHAR_TO_FREQ_ORDER
         self._table_size = GB2312_TABLE_SIZE
         self.typical_distribution_ratio = GB2312_TYPICAL_DISTRIBUTION_RATIO
 
-    def get_order(self, byte_str):
+    def get_order(self, byte_str: Union[bytes, bytearray]) -> int:
         # for GB2312 encoding, we are interested
         #  first  byte range: 0xb0 -- 0xfe
         #  second byte range: 0xa1 -- 0xfe
@@ -197,13 +199,13 @@ class GB2312DistributionAnalysis(CharDistributionAnalysis):
 
 
 class Big5DistributionAnalysis(CharDistributionAnalysis):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self._char_to_freq_order = BIG5_CHAR_TO_FREQ_ORDER
         self._table_size = BIG5_TABLE_SIZE
         self.typical_distribution_ratio = BIG5_TYPICAL_DISTRIBUTION_RATIO
 
-    def get_order(self, byte_str):
+    def get_order(self, byte_str: Union[bytes, bytearray]) -> int:
         # for big5 encoding, we are interested
         #   first  byte range: 0xa4 -- 0xfe
         #   second byte range: 0x40 -- 0x7e , 0xa1 -- 0xfe
@@ -217,13 +219,13 @@ class Big5DistributionAnalysis(CharDistributionAnalysis):
 
 
 class SJISDistributionAnalysis(CharDistributionAnalysis):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self._char_to_freq_order = JIS_CHAR_TO_FREQ_ORDER
         self._table_size = JIS_TABLE_SIZE
         self.typical_distribution_ratio = JIS_TYPICAL_DISTRIBUTION_RATIO
 
-    def get_order(self, byte_str):
+    def get_order(self, byte_str: Union[bytes, bytearray]) -> int:
         # for sjis encoding, we are interested
         #   first  byte range: 0x81 -- 0x9f , 0xe0 -- 0xfe
         #   second byte range: 0x40 -- 0x7e,  0x81 -- oxfe
@@ -242,13 +244,13 @@ class SJISDistributionAnalysis(CharDistributionAnalysis):
 
 
 class EUCJPDistributionAnalysis(CharDistributionAnalysis):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self._char_to_freq_order = JIS_CHAR_TO_FREQ_ORDER
         self._table_size = JIS_TABLE_SIZE
         self.typical_distribution_ratio = JIS_TYPICAL_DISTRIBUTION_RATIO
 
-    def get_order(self, byte_str):
+    def get_order(self, byte_str: Union[bytes, bytearray]) -> int:
         # for euc-JP encoding, we are interested
         #   first  byte range: 0xa0 -- 0xfe
         #   second byte range: 0xa1 -- 0xfe
diff --git a/src/pip/_vendor/chardet/charsetgroupprober.py b/src/pip/_vendor/chardet/charsetgroupprober.py
index 778ff332b..6def56b4a 100644
--- a/src/pip/_vendor/chardet/charsetgroupprober.py
+++ b/src/pip/_vendor/chardet/charsetgroupprober.py
@@ -25,29 +25,30 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from typing import List, Optional, Union
+
 from .charsetprober import CharSetProber
-from .enums import ProbingState
+from .enums import LanguageFilter, ProbingState
 
 
 class CharSetGroupProber(CharSetProber):
-    def __init__(self, lang_filter=None):
+    def __init__(self, lang_filter: LanguageFilter = LanguageFilter.NONE) -> None:
         super().__init__(lang_filter=lang_filter)
         self._active_num = 0
-        self.probers = []
-        self._best_guess_prober = None
+        self.probers: List[CharSetProber] = []
+        self._best_guess_prober: Optional[CharSetProber] = None
 
-    def reset(self):
+    def reset(self) -> None:
         super().reset()
         self._active_num = 0
         for prober in self.probers:
-            if prober:
-                prober.reset()
-                prober.active = True
-                self._active_num += 1
+            prober.reset()
+            prober.active = True
+            self._active_num += 1
         self._best_guess_prober = None
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> Optional[str]:
         if not self._best_guess_prober:
             self.get_confidence()
             if not self._best_guess_prober:
@@ -55,17 +56,15 @@ class CharSetGroupProber(CharSetProber):
         return self._best_guess_prober.charset_name
 
     @property
-    def language(self):
+    def language(self) -> Optional[str]:
         if not self._best_guess_prober:
             self.get_confidence()
             if not self._best_guess_prober:
                 return None
         return self._best_guess_prober.language
 
-    def feed(self, byte_str):
+    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
         for prober in self.probers:
-            if not prober:
-                continue
             if not prober.active:
                 continue
             state = prober.feed(byte_str)
@@ -83,7 +82,7 @@ class CharSetGroupProber(CharSetProber):
                     return self.state
         return self.state
 
-    def get_confidence(self):
+    def get_confidence(self) -> float:
         state = self.state
         if state == ProbingState.FOUND_IT:
             return 0.99
@@ -92,8 +91,6 @@ class CharSetGroupProber(CharSetProber):
         best_conf = 0.0
         self._best_guess_prober = None
         for prober in self.probers:
-            if not prober:
-                continue
             if not prober.active:
                 self.logger.debug("%s not active", prober.charset_name)
                 continue
diff --git a/src/pip/_vendor/chardet/charsetprober.py b/src/pip/_vendor/chardet/charsetprober.py
index 9f1afd999..a103ca113 100644
--- a/src/pip/_vendor/chardet/charsetprober.py
+++ b/src/pip/_vendor/chardet/charsetprober.py
@@ -28,8 +28,9 @@
 
 import logging
 import re
+from typing import Optional, Union
 
-from .enums import ProbingState
+from .enums import LanguageFilter, ProbingState
 
 INTERNATIONAL_WORDS_PATTERN = re.compile(
     b"[a-zA-Z]*[\x80-\xFF]+[a-zA-Z]*[^a-zA-Z\x80-\xFF]?"
@@ -40,35 +41,40 @@ class CharSetProber:
 
     SHORTCUT_THRESHOLD = 0.95
 
-    def __init__(self, lang_filter=None):
-        self._state = None
+    def __init__(self, lang_filter: LanguageFilter = LanguageFilter.NONE) -> None:
+        self._state = ProbingState.DETECTING
+        self.active = True
         self.lang_filter = lang_filter
         self.logger = logging.getLogger(__name__)
 
-    def reset(self):
+    def reset(self) -> None:
         self._state = ProbingState.DETECTING
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> Optional[str]:
         return None
 
-    def feed(self, byte_str):
+    @property
+    def language(self) -> Optional[str]:
+        raise NotImplementedError
+
+    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
         raise NotImplementedError
 
     @property
-    def state(self):
+    def state(self) -> ProbingState:
         return self._state
 
-    def get_confidence(self):
+    def get_confidence(self) -> float:
         return 0.0
 
     @staticmethod
-    def filter_high_byte_only(buf):
+    def filter_high_byte_only(buf: Union[bytes, bytearray]) -> bytes:
         buf = re.sub(b"([\x00-\x7F])+", b" ", buf)
         return buf
 
     @staticmethod
-    def filter_international_words(buf):
+    def filter_international_words(buf: Union[bytes, bytearray]) -> bytearray:
         """
         We define three types of bytes:
         alphabet: english alphabets [a-zA-Z]
@@ -102,7 +108,7 @@ class CharSetProber:
         return filtered
 
     @staticmethod
-    def remove_xml_tags(buf):
+    def remove_xml_tags(buf: Union[bytes, bytearray]) -> bytes:
         """
         Returns a copy of ``buf`` that retains only the sequences of English
         alphabet and high byte characters that are not between <> characters.
@@ -117,10 +123,13 @@ class CharSetProber:
 
         for curr, buf_char in enumerate(buf):
             # Check if we're coming out of or entering an XML tag
-            if buf_char == b">":
+
+            # https://github.com/python/typeshed/issues/8182
+            if buf_char == b">":  # type: ignore[comparison-overlap]
                 prev = curr + 1
                 in_tag = False
-            elif buf_char == b"<":
+            # https://github.com/python/typeshed/issues/8182
+            elif buf_char == b"<":  # type: ignore[comparison-overlap]
                 if curr > prev and not in_tag:
                     # Keep everything after last non-extended-ASCII,
                     # non-alphabetic character
diff --git a/src/pip/_vendor/chardet/cli/chardetect.py b/src/pip/_vendor/chardet/cli/chardetect.py
index 7926fa37e..43f6e144f 100644
--- a/src/pip/_vendor/chardet/cli/chardetect.py
+++ b/src/pip/_vendor/chardet/cli/chardetect.py
@@ -15,12 +15,18 @@ If no paths are provided, it takes its input from stdin.
 
 import argparse
 import sys
+from typing import Iterable, List, Optional
 
 from .. import __version__
 from ..universaldetector import UniversalDetector
 
 
-def description_of(lines, name="stdin"):
+def description_of(
+    lines: Iterable[bytes],
+    name: str = "stdin",
+    minimal: bool = False,
+    should_rename_legacy: bool = False,
+) -> Optional[str]:
     """
     Return a string describing the probable encoding of a file or
     list of strings.
@@ -29,8 +35,11 @@ def description_of(lines, name="stdin"):
     :type lines: Iterable of bytes
     :param name: Name of file or collection of lines
     :type name: str
+    :param should_rename_legacy:  Should we rename legacy encodings to
+                                  their more modern equivalents?
+    :type should_rename_legacy:   ``bool``
     """
-    u = UniversalDetector()
+    u = UniversalDetector(should_rename_legacy=should_rename_legacy)
     for line in lines:
         line = bytearray(line)
         u.feed(line)
@@ -39,12 +48,14 @@ def description_of(lines, name="stdin"):
             break
     u.close()
     result = u.result
+    if minimal:
+        return result["encoding"]
     if result["encoding"]:
         return f'{name}: {result["encoding"]} with confidence {result["confidence"]}'
     return f"{name}: no result"
 
 
-def main(argv=None):
+def main(argv: Optional[List[str]] = None) -> None:
     """
     Handles command line arguments and gets things started.
 
@@ -54,18 +65,29 @@ def main(argv=None):
     """
     # Get command line arguments
     parser = argparse.ArgumentParser(
-        description="Takes one or more file paths and reports their detected \
-                     encodings"
+        description=(
+            "Takes one or more file paths and reports their detected encodings"
+        )
     )
     parser.add_argument(
         "input",
-        help="File whose encoding we would like to determine. \
-                              (default: stdin)",
+        help="File whose encoding we would like to determine. (default: stdin)",
         type=argparse.FileType("rb"),
         nargs="*",
         default=[sys.stdin.buffer],
     )
     parser.add_argument(
+        "--minimal",
+        help="Print only the encoding to standard output",
+        action="store_true",
+    )
+    parser.add_argument(
+        "-l",
+        "--legacy",
+        help="Rename legacy encodings to more modern ones.",
+        action="store_true",
+    )
+    parser.add_argument(
         "--version", action="version", version=f"%(prog)s {__version__}"
     )
     args = parser.parse_args(argv)
@@ -79,7 +101,11 @@ def main(argv=None):
                 "--help\n",
                 file=sys.stderr,
             )
-        print(description_of(f, f.name))
+        print(
+            description_of(
+                f, f.name, minimal=args.minimal, should_rename_legacy=args.legacy
+            )
+        )
 
 
 if __name__ == "__main__":
diff --git a/src/pip/_vendor/chardet/codingstatemachine.py b/src/pip/_vendor/chardet/codingstatemachine.py
index d3e3e825d..8ed4a8773 100644
--- a/src/pip/_vendor/chardet/codingstatemachine.py
+++ b/src/pip/_vendor/chardet/codingstatemachine.py
@@ -27,6 +27,7 @@
 
 import logging
 
+from .codingstatemachinedict import CodingStateMachineDict
 from .enums import MachineState
 
 
@@ -53,18 +54,19 @@ class CodingStateMachine:
                  encoding from consideration from here on.
     """
 
-    def __init__(self, sm):
+    def __init__(self, sm: CodingStateMachineDict) -> None:
         self._model = sm
         self._curr_byte_pos = 0
         self._curr_char_len = 0
-        self._curr_state = None
+        self._curr_state = MachineState.START
+        self.active = True
         self.logger = logging.getLogger(__name__)
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         self._curr_state = MachineState.START
 
-    def next_state(self, c):
+    def next_state(self, c: int) -> int:
         # for each byte we get its class
         # if it is first byte, we also get byte length
         byte_class = self._model["class_table"][c]
@@ -77,12 +79,12 @@ class CodingStateMachine:
         self._curr_byte_pos += 1
         return self._curr_state
 
-    def get_current_charlen(self):
+    def get_current_charlen(self) -> int:
         return self._curr_char_len
 
-    def get_coding_state_machine(self):
+    def get_coding_state_machine(self) -> str:
         return self._model["name"]
 
     @property
-    def language(self):
+    def language(self) -> str:
         return self._model["language"]
diff --git a/src/pip/_vendor/chardet/codingstatemachinedict.py b/src/pip/_vendor/chardet/codingstatemachinedict.py
new file mode 100644
index 000000000..7a3c4c7e3
--- /dev/null
+++ b/src/pip/_vendor/chardet/codingstatemachinedict.py
@@ -0,0 +1,19 @@
+from typing import TYPE_CHECKING, Tuple
+
+if TYPE_CHECKING:
+    # TypedDict was introduced in Python 3.8.
+    #
+    # TODO: Remove the else block and TYPE_CHECKING check when dropping support
+    # for Python 3.7.
+    from typing import TypedDict
+
+    class CodingStateMachineDict(TypedDict, total=False):
+        class_table: Tuple[int, ...]
+        class_factor: int
+        state_table: Tuple[int, ...]
+        char_len_table: Tuple[int, ...]
+        name: str
+        language: str  # Optional key
+
+else:
+    CodingStateMachineDict = dict
diff --git a/src/pip/_vendor/chardet/cp949prober.py b/src/pip/_vendor/chardet/cp949prober.py
index 28a1f3dbb..fa7307ed8 100644
--- a/src/pip/_vendor/chardet/cp949prober.py
+++ b/src/pip/_vendor/chardet/cp949prober.py
@@ -32,7 +32,7 @@ from .mbcssm import CP949_SM_MODEL
 
 
 class CP949Prober(MultiByteCharSetProber):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.coding_sm = CodingStateMachine(CP949_SM_MODEL)
         # NOTE: CP949 is a superset of EUC-KR, so the distribution should be
@@ -41,9 +41,9 @@ class CP949Prober(MultiByteCharSetProber):
         self.reset()
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
         return "CP949"
 
     @property
-    def language(self):
+    def language(self) -> str:
         return "Korean"
diff --git a/src/pip/_vendor/chardet/enums.py b/src/pip/_vendor/chardet/enums.py
index 32a77e76c..5e3e19823 100644
--- a/src/pip/_vendor/chardet/enums.py
+++ b/src/pip/_vendor/chardet/enums.py
@@ -4,6 +4,8 @@ All of the Enums that are used throughout the chardet package.
 :author: Dan Blanchard (dan.blanchard@gmail.com)
 """
 
+from enum import Enum, Flag
+
 
 class InputState:
     """
@@ -15,12 +17,13 @@ class InputState:
     HIGH_BYTE = 2
 
 
-class LanguageFilter:
+class LanguageFilter(Flag):
     """
     This enum represents the different language filters we can apply to a
     ``UniversalDetector``.
     """
 
+    NONE = 0x00
     CHINESE_SIMPLIFIED = 0x01
     CHINESE_TRADITIONAL = 0x02
     JAPANESE = 0x04
@@ -31,7 +34,7 @@ class LanguageFilter:
     CJK = CHINESE | JAPANESE | KOREAN
 
 
-class ProbingState:
+class ProbingState(Enum):
     """
     This enum represents the different states a prober can be in.
     """
@@ -62,7 +65,7 @@ class SequenceLikelihood:
     POSITIVE = 3
 
     @classmethod
-    def get_num_categories(cls):
+    def get_num_categories(cls) -> int:
         """:returns: The number of likelihood categories in the enum."""
         return 4
 
diff --git a/src/pip/_vendor/chardet/escprober.py b/src/pip/_vendor/chardet/escprober.py
index d9926115d..fd713830d 100644
--- a/src/pip/_vendor/chardet/escprober.py
+++ b/src/pip/_vendor/chardet/escprober.py
@@ -25,6 +25,8 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from typing import Optional, Union
+
 from .charsetprober import CharSetProber
 from .codingstatemachine import CodingStateMachine
 from .enums import LanguageFilter, MachineState, ProbingState
@@ -43,7 +45,7 @@ class EscCharSetProber(CharSetProber):
     identify these encodings.
     """
 
-    def __init__(self, lang_filter=None):
+    def __init__(self, lang_filter: LanguageFilter = LanguageFilter.NONE) -> None:
         super().__init__(lang_filter=lang_filter)
         self.coding_sm = []
         if self.lang_filter & LanguageFilter.CHINESE_SIMPLIFIED:
@@ -53,17 +55,15 @@ class EscCharSetProber(CharSetProber):
             self.coding_sm.append(CodingStateMachine(ISO2022JP_SM_MODEL))
         if self.lang_filter & LanguageFilter.KOREAN:
             self.coding_sm.append(CodingStateMachine(ISO2022KR_SM_MODEL))
-        self.active_sm_count = None
-        self._detected_charset = None
-        self._detected_language = None
-        self._state = None
+        self.active_sm_count = 0
+        self._detected_charset: Optional[str] = None
+        self._detected_language: Optional[str] = None
+        self._state = ProbingState.DETECTING
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         super().reset()
         for coding_sm in self.coding_sm:
-            if not coding_sm:
-                continue
             coding_sm.active = True
             coding_sm.reset()
         self.active_sm_count = len(self.coding_sm)
@@ -71,20 +71,20 @@ class EscCharSetProber(CharSetProber):
         self._detected_language = None
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> Optional[str]:
         return self._detected_charset
 
     @property
-    def language(self):
+    def language(self) -> Optional[str]:
         return self._detected_language
 
-    def get_confidence(self):
+    def get_confidence(self) -> float:
         return 0.99 if self._detected_charset else 0.00
 
-    def feed(self, byte_str):
+    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
         for c in byte_str:
             for coding_sm in self.coding_sm:
-                if not coding_sm or not coding_sm.active:
+                if not coding_sm.active:
                     continue
                 coding_state = coding_sm.next_state(c)
                 if coding_state == MachineState.ERROR:
diff --git a/src/pip/_vendor/chardet/escsm.py b/src/pip/_vendor/chardet/escsm.py
index 3aa0f4d96..11d4adf77 100644
--- a/src/pip/_vendor/chardet/escsm.py
+++ b/src/pip/_vendor/chardet/escsm.py
@@ -25,6 +25,7 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from .codingstatemachinedict import CodingStateMachineDict
 from .enums import MachineState
 
 # fmt: off
@@ -75,7 +76,7 @@ MachineState.ITS_ME, MachineState.ITS_ME, MachineState.ERROR, MachineState.ERROR
 
 HZ_CHAR_LEN_TABLE = (0, 0, 0, 0, 0, 0)
 
-HZ_SM_MODEL = {
+HZ_SM_MODEL: CodingStateMachineDict = {
     "class_table": HZ_CLS,
     "class_factor": 6,
     "state_table": HZ_ST,
@@ -134,7 +135,7 @@ ISO2022CN_ST = (
 
 ISO2022CN_CHAR_LEN_TABLE = (0, 0, 0, 0, 0, 0, 0, 0, 0)
 
-ISO2022CN_SM_MODEL = {
+ISO2022CN_SM_MODEL: CodingStateMachineDict = {
     "class_table": ISO2022CN_CLS,
     "class_factor": 9,
     "state_table": ISO2022CN_ST,
@@ -194,7 +195,7 @@ ISO2022JP_ST = (
 
 ISO2022JP_CHAR_LEN_TABLE = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
 
-ISO2022JP_SM_MODEL = {
+ISO2022JP_SM_MODEL: CodingStateMachineDict = {
     "class_table": ISO2022JP_CLS,
     "class_factor": 10,
     "state_table": ISO2022JP_ST,
@@ -250,7 +251,7 @@ ISO2022KR_ST = (
 
 ISO2022KR_CHAR_LEN_TABLE = (0, 0, 0, 0, 0, 0)
 
-ISO2022KR_SM_MODEL = {
+ISO2022KR_SM_MODEL: CodingStateMachineDict = {
     "class_table": ISO2022KR_CLS,
     "class_factor": 6,
     "state_table": ISO2022KR_ST,
diff --git a/src/pip/_vendor/chardet/eucjpprober.py b/src/pip/_vendor/chardet/eucjpprober.py
index abf2e66e2..39487f409 100644
--- a/src/pip/_vendor/chardet/eucjpprober.py
+++ b/src/pip/_vendor/chardet/eucjpprober.py
@@ -25,6 +25,8 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from typing import Union
+
 from .chardistribution import EUCJPDistributionAnalysis
 from .codingstatemachine import CodingStateMachine
 from .enums import MachineState, ProbingState
@@ -34,26 +36,29 @@ from .mbcssm import EUCJP_SM_MODEL
 
 
 class EUCJPProber(MultiByteCharSetProber):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.coding_sm = CodingStateMachine(EUCJP_SM_MODEL)
         self.distribution_analyzer = EUCJPDistributionAnalysis()
         self.context_analyzer = EUCJPContextAnalysis()
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         super().reset()
         self.context_analyzer.reset()
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
         return "EUC-JP"
 
     @property
-    def language(self):
+    def language(self) -> str:
         return "Japanese"
 
-    def feed(self, byte_str):
+    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
+        assert self.coding_sm is not None
+        assert self.distribution_analyzer is not None
+
         for i, byte in enumerate(byte_str):
             # PY3K: byte_str is a byte array, so byte is an int, not a byte
             coding_state = self.coding_sm.next_state(byte)
@@ -89,7 +94,9 @@ class EUCJPProber(MultiByteCharSetProber):
 
         return self.state
 
-    def get_confidence(self):
+    def get_confidence(self) -> float:
+        assert self.distribution_analyzer is not None
+
         context_conf = self.context_analyzer.get_confidence()
         distrib_conf = self.distribution_analyzer.get_confidence()
         return max(context_conf, distrib_conf)
diff --git a/src/pip/_vendor/chardet/euckrprober.py b/src/pip/_vendor/chardet/euckrprober.py
index 154a6d216..1fc5de046 100644
--- a/src/pip/_vendor/chardet/euckrprober.py
+++ b/src/pip/_vendor/chardet/euckrprober.py
@@ -32,16 +32,16 @@ from .mbcssm import EUCKR_SM_MODEL
 
 
 class EUCKRProber(MultiByteCharSetProber):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.coding_sm = CodingStateMachine(EUCKR_SM_MODEL)
         self.distribution_analyzer = EUCKRDistributionAnalysis()
         self.reset()
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
         return "EUC-KR"
 
     @property
-    def language(self):
+    def language(self) -> str:
         return "Korean"
diff --git a/src/pip/_vendor/chardet/euctwprober.py b/src/pip/_vendor/chardet/euctwprober.py
index ca10a23ca..a37ab1899 100644
--- a/src/pip/_vendor/chardet/euctwprober.py
+++ b/src/pip/_vendor/chardet/euctwprober.py
@@ -32,16 +32,16 @@ from .mbcssm import EUCTW_SM_MODEL
 
 
 class EUCTWProber(MultiByteCharSetProber):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.coding_sm = CodingStateMachine(EUCTW_SM_MODEL)
         self.distribution_analyzer = EUCTWDistributionAnalysis()
         self.reset()
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
         return "EUC-TW"
 
     @property
-    def language(self):
+    def language(self) -> str:
         return "Taiwan"
diff --git a/src/pip/_vendor/chardet/gb2312prober.py b/src/pip/_vendor/chardet/gb2312prober.py
index 251c04295..d423e7311 100644
--- a/src/pip/_vendor/chardet/gb2312prober.py
+++ b/src/pip/_vendor/chardet/gb2312prober.py
@@ -32,16 +32,16 @@ from .mbcssm import GB2312_SM_MODEL
 
 
 class GB2312Prober(MultiByteCharSetProber):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.coding_sm = CodingStateMachine(GB2312_SM_MODEL)
         self.distribution_analyzer = GB2312DistributionAnalysis()
         self.reset()
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
         return "GB2312"
 
     @property
-    def language(self):
+    def language(self) -> str:
         return "Chinese"
diff --git a/src/pip/_vendor/chardet/hebrewprober.py b/src/pip/_vendor/chardet/hebrewprober.py
index 3ca634bf3..785d0057b 100644
--- a/src/pip/_vendor/chardet/hebrewprober.py
+++ b/src/pip/_vendor/chardet/hebrewprober.py
@@ -25,8 +25,11 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from typing import Optional, Union
+
 from .charsetprober import CharSetProber
 from .enums import ProbingState
+from .sbcharsetprober import SingleByteCharSetProber
 
 # This prober doesn't actually recognize a language or a charset.
 # It is a helper prober for the use of the Hebrew model probers
@@ -127,6 +130,7 @@ from .enums import ProbingState
 
 
 class HebrewProber(CharSetProber):
+    SPACE = 0x20
     # windows-1255 / ISO-8859-8 code points of interest
     FINAL_KAF = 0xEA
     NORMAL_KAF = 0xEB
@@ -152,31 +156,35 @@ class HebrewProber(CharSetProber):
     VISUAL_HEBREW_NAME = "ISO-8859-8"
     LOGICAL_HEBREW_NAME = "windows-1255"
 
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
-        self._final_char_logical_score = None
-        self._final_char_visual_score = None
-        self._prev = None
-        self._before_prev = None
-        self._logical_prober = None
-        self._visual_prober = None
+        self._final_char_logical_score = 0
+        self._final_char_visual_score = 0
+        self._prev = self.SPACE
+        self._before_prev = self.SPACE
+        self._logical_prober: Optional[SingleByteCharSetProber] = None
+        self._visual_prober: Optional[SingleByteCharSetProber] = None
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         self._final_char_logical_score = 0
         self._final_char_visual_score = 0
         # The two last characters seen in the previous buffer,
         # mPrev and mBeforePrev are initialized to space in order to simulate
         # a word delimiter at the beginning of the data
-        self._prev = " "
-        self._before_prev = " "
+        self._prev = self.SPACE
+        self._before_prev = self.SPACE
         # These probers are owned by the group prober.
 
-    def set_model_probers(self, logical_prober, visual_prober):
+    def set_model_probers(
+        self,
+        logical_prober: SingleByteCharSetProber,
+        visual_prober: SingleByteCharSetProber,
+    ) -> None:
         self._logical_prober = logical_prober
         self._visual_prober = visual_prober
 
-    def is_final(self, c):
+    def is_final(self, c: int) -> bool:
         return c in [
             self.FINAL_KAF,
             self.FINAL_MEM,
@@ -185,7 +193,7 @@ class HebrewProber(CharSetProber):
             self.FINAL_TSADI,
         ]
 
-    def is_non_final(self, c):
+    def is_non_final(self, c: int) -> bool:
         # The normal Tsadi is not a good Non-Final letter due to words like
         # 'lechotet' (to chat) containing an apostrophe after the tsadi. This
         # apostrophe is converted to a space in FilterWithoutEnglishLetters
@@ -198,7 +206,7 @@ class HebrewProber(CharSetProber):
         # since these words are quite rare.
         return c in [self.NORMAL_KAF, self.NORMAL_MEM, self.NORMAL_NUN, self.NORMAL_PE]
 
-    def feed(self, byte_str):
+    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
         # Final letter analysis for logical-visual decision.
         # Look for evidence that the received buffer is either logical Hebrew
         # or visual Hebrew.
@@ -232,9 +240,9 @@ class HebrewProber(CharSetProber):
         byte_str = self.filter_high_byte_only(byte_str)
 
         for cur in byte_str:
-            if cur == " ":
+            if cur == self.SPACE:
                 # We stand on a space - a word just ended
-                if self._before_prev != " ":
+                if self._before_prev != self.SPACE:
                     # next-to-last char was not a space so self._prev is not a
                     # 1 letter word
                     if self.is_final(self._prev):
@@ -247,9 +255,9 @@ class HebrewProber(CharSetProber):
             else:
                 # Not standing on a space
                 if (
-                    (self._before_prev == " ")
+                    (self._before_prev == self.SPACE)
                     and (self.is_final(self._prev))
-                    and (cur != " ")
+                    and (cur != self.SPACE)
                 ):
                     # case (3) [-2:space][-1:final letter][cur:not space]
                     self._final_char_visual_score += 1
@@ -261,7 +269,10 @@ class HebrewProber(CharSetProber):
         return ProbingState.DETECTING
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
+        assert self._logical_prober is not None
+        assert self._visual_prober is not None
+
         # Make the decision: is it Logical or Visual?
         # If the final letter score distance is dominant enough, rely on it.
         finalsub = self._final_char_logical_score - self._final_char_visual_score
@@ -289,11 +300,14 @@ class HebrewProber(CharSetProber):
         return self.LOGICAL_HEBREW_NAME
 
     @property
-    def language(self):
+    def language(self) -> str:
         return "Hebrew"
 
     @property
-    def state(self):
+    def state(self) -> ProbingState:
+        assert self._logical_prober is not None
+        assert self._visual_prober is not None
+
         # Remain active as long as any of the model probers are active.
         if (self._logical_prober.state == ProbingState.NOT_ME) and (
             self._visual_prober.state == ProbingState.NOT_ME
diff --git a/src/pip/_vendor/chardet/johabprober.py b/src/pip/_vendor/chardet/johabprober.py
index 6f359d193..d7364ba61 100644
--- a/src/pip/_vendor/chardet/johabprober.py
+++ b/src/pip/_vendor/chardet/johabprober.py
@@ -32,16 +32,16 @@ from .mbcssm import JOHAB_SM_MODEL
 
 
 class JOHABProber(MultiByteCharSetProber):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.coding_sm = CodingStateMachine(JOHAB_SM_MODEL)
         self.distribution_analyzer = JOHABDistributionAnalysis()
         self.reset()
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
         return "Johab"
 
     @property
-    def language(self):
+    def language(self) -> str:
         return "Korean"
diff --git a/src/pip/_vendor/chardet/jpcntx.py b/src/pip/_vendor/chardet/jpcntx.py
index 7a8e5be06..2f53bdda0 100644
--- a/src/pip/_vendor/chardet/jpcntx.py
+++ b/src/pip/_vendor/chardet/jpcntx.py
@@ -25,6 +25,7 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from typing import List, Tuple, Union
 
 # This is hiragana 2-char sequence table, the number in each cell represents its frequency category
 # fmt: off
@@ -123,15 +124,15 @@ class JapaneseContextAnalysis:
     MAX_REL_THRESHOLD = 1000
     MINIMUM_DATA_THRESHOLD = 4
 
-    def __init__(self):
-        self._total_rel = None
-        self._rel_sample = None
-        self._need_to_skip_char_num = None
-        self._last_char_order = None
-        self._done = None
+    def __init__(self) -> None:
+        self._total_rel = 0
+        self._rel_sample: List[int] = []
+        self._need_to_skip_char_num = 0
+        self._last_char_order = -1
+        self._done = False
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         self._total_rel = 0  # total sequence received
         # category counters, each integer counts sequence in its category
         self._rel_sample = [0] * self.NUM_OF_CATEGORY
@@ -143,7 +144,7 @@ class JapaneseContextAnalysis:
         # been made
         self._done = False
 
-    def feed(self, byte_str, num_bytes):
+    def feed(self, byte_str: Union[bytes, bytearray], num_bytes: int) -> None:
         if self._done:
             return
 
@@ -172,29 +173,29 @@ class JapaneseContextAnalysis:
                     ] += 1
                 self._last_char_order = order
 
-    def got_enough_data(self):
+    def got_enough_data(self) -> bool:
         return self._total_rel > self.ENOUGH_REL_THRESHOLD
 
-    def get_confidence(self):
+    def get_confidence(self) -> float:
         # This is just one way to calculate confidence. It works well for me.
         if self._total_rel > self.MINIMUM_DATA_THRESHOLD:
             return (self._total_rel - self._rel_sample[0]) / self._total_rel
         return self.DONT_KNOW
 
-    def get_order(self, _):
+    def get_order(self, _: Union[bytes, bytearray]) -> Tuple[int, int]:
         return -1, 1
 
 
 class SJISContextAnalysis(JapaneseContextAnalysis):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self._charset_name = "SHIFT_JIS"
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
         return self._charset_name
 
-    def get_order(self, byte_str):
+    def get_order(self, byte_str: Union[bytes, bytearray]) -> Tuple[int, int]:
         if not byte_str:
             return -1, 1
         # find out current char's byte length
@@ -216,7 +217,7 @@ class SJISContextAnalysis(JapaneseContextAnalysis):
 
 
 class EUCJPContextAnalysis(JapaneseContextAnalysis):
-    def get_order(self, byte_str):
+    def get_order(self, byte_str: Union[bytes, bytearray]) -> Tuple[int, int]:
         if not byte_str:
             return -1, 1
         # find out current char's byte length
diff --git a/src/pip/_vendor/chardet/latin1prober.py b/src/pip/_vendor/chardet/latin1prober.py
index 241f14ab9..59a01d91b 100644
--- a/src/pip/_vendor/chardet/latin1prober.py
+++ b/src/pip/_vendor/chardet/latin1prober.py
@@ -26,6 +26,8 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from typing import List, Union
+
 from .charsetprober import CharSetProber
 from .enums import ProbingState
 
@@ -96,26 +98,26 @@ Latin1ClassModel = (
 
 
 class Latin1Prober(CharSetProber):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
-        self._last_char_class = None
-        self._freq_counter = None
+        self._last_char_class = OTH
+        self._freq_counter: List[int] = []
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         self._last_char_class = OTH
         self._freq_counter = [0] * FREQ_CAT_NUM
         super().reset()
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
         return "ISO-8859-1"
 
     @property
-    def language(self):
+    def language(self) -> str:
         return ""
 
-    def feed(self, byte_str):
+    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
         byte_str = self.remove_xml_tags(byte_str)
         for c in byte_str:
             char_class = Latin1_CharToClass[c]
@@ -128,7 +130,7 @@ class Latin1Prober(CharSetProber):
 
         return self.state
 
-    def get_confidence(self):
+    def get_confidence(self) -> float:
         if self.state == ProbingState.NOT_ME:
             return 0.01
 
diff --git a/src/pip/_vendor/chardet/macromanprober.py b/src/pip/_vendor/chardet/macromanprober.py
new file mode 100644
index 000000000..1425d10ec
--- /dev/null
+++ b/src/pip/_vendor/chardet/macromanprober.py
@@ -0,0 +1,162 @@
+######################## BEGIN LICENSE BLOCK ########################
+# This code was modified from latin1prober.py by Rob Speer <rob@lumino.so>.
+# The Original Code is Mozilla Universal charset detector code.
+#
+# The Initial Developer of the Original Code is
+# Netscape Communications Corporation.
+# Portions created by the Initial Developer are Copyright (C) 2001
+# the Initial Developer. All Rights Reserved.
+#
+# Contributor(s):
+#   Rob Speer - adapt to MacRoman encoding
+#   Mark Pilgrim - port to Python
+#   Shy Shalom - original C code
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+# 02110-1301  USA
+######################### END LICENSE BLOCK #########################
+
+from typing import List, Union
+
+from .charsetprober import CharSetProber
+from .enums import ProbingState
+
+FREQ_CAT_NUM = 4
+
+UDF = 0  # undefined
+OTH = 1  # other
+ASC = 2  # ascii capital letter
+ASS = 3  # ascii small letter
+ACV = 4  # accent capital vowel
+ACO = 5  # accent capital other
+ASV = 6  # accent small vowel
+ASO = 7  # accent small other
+ODD = 8  # character that is unlikely to appear
+CLASS_NUM = 9  # total classes
+
+# The change from Latin1 is that we explicitly look for extended characters
+# that are infrequently-occurring symbols, and consider them to always be
+# improbable. This should let MacRoman get out of the way of more likely
+# encodings in most situations.
+
+# fmt: off
+MacRoman_CharToClass = (
+    OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,  # 00 - 07
+    OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,  # 08 - 0F
+    OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,  # 10 - 17
+    OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,  # 18 - 1F
+    OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,  # 20 - 27
+    OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,  # 28 - 2F
+    OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,  # 30 - 37
+    OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,  # 38 - 3F
+    OTH, ASC, ASC, ASC, ASC, ASC, ASC, ASC,  # 40 - 47
+    ASC, ASC, ASC, ASC, ASC, ASC, ASC, ASC,  # 48 - 4F
+    ASC, ASC, ASC, ASC, ASC, ASC, ASC, ASC,  # 50 - 57
+    ASC, ASC, ASC, OTH, OTH, OTH, OTH, OTH,  # 58 - 5F
+    OTH, ASS, ASS, ASS, ASS, ASS, ASS, ASS,  # 60 - 67
+    ASS, ASS, ASS, ASS, ASS, ASS, ASS, ASS,  # 68 - 6F
+    ASS, ASS, ASS, ASS, ASS, ASS, ASS, ASS,  # 70 - 77
+    ASS, ASS, ASS, OTH, OTH, OTH, OTH, OTH,  # 78 - 7F
+    ACV, ACV, ACO, ACV, ACO, ACV, ACV, ASV,  # 80 - 87
+    ASV, ASV, ASV, ASV, ASV, ASO, ASV, ASV,  # 88 - 8F
+    ASV, ASV, ASV, ASV, ASV, ASV, ASO, ASV,  # 90 - 97
+    ASV, ASV, ASV, ASV, ASV, ASV, ASV, ASV,  # 98 - 9F
+    OTH, OTH, OTH, OTH, OTH, OTH, OTH, ASO,  # A0 - A7
+    OTH, OTH, ODD, ODD, OTH, OTH, ACV, ACV,  # A8 - AF
+    OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,  # B0 - B7
+    OTH, OTH, OTH, OTH, OTH, OTH, ASV, ASV,  # B8 - BF
+    OTH, OTH, ODD, OTH, ODD, OTH, OTH, OTH,  # C0 - C7
+    OTH, OTH, OTH, ACV, ACV, ACV, ACV, ASV,  # C8 - CF
+    OTH, OTH, OTH, OTH, OTH, OTH, OTH, ODD,  # D0 - D7
+    ASV, ACV, ODD, OTH, OTH, OTH, OTH, OTH,  # D8 - DF
+    OTH, OTH, OTH, OTH, OTH, ACV, ACV, ACV,  # E0 - E7
+    ACV, ACV, ACV, ACV, ACV, ACV, ACV, ACV,  # E8 - EF
+    ODD, ACV, ACV, ACV, ACV, ASV, ODD, ODD,  # F0 - F7
+    ODD, ODD, ODD, ODD, ODD, ODD, ODD, ODD,  # F8 - FF
+)
+
+# 0 : illegal
+# 1 : very unlikely
+# 2 : normal
+# 3 : very likely
+MacRomanClassModel = (
+# UDF OTH ASC ASS ACV ACO ASV ASO ODD
+    0,  0,  0,  0,  0,  0,  0,  0,  0,  # UDF
+    0,  3,  3,  3,  3,  3,  3,  3,  1,  # OTH
+    0,  3,  3,  3,  3,  3,  3,  3,  1,  # ASC
+    0,  3,  3,  3,  1,  1,  3,  3,  1,  # ASS
+    0,  3,  3,  3,  1,  2,  1,  2,  1,  # ACV
+    0,  3,  3,  3,  3,  3,  3,  3,  1,  # ACO
+    0,  3,  1,  3,  1,  1,  1,  3,  1,  # ASV
+    0,  3,  1,  3,  1,  1,  3,  3,  1,  # ASO
+    0,  1,  1,  1,  1,  1,  1,  1,  1,  # ODD
+)
+# fmt: on
+
+
+class MacRomanProber(CharSetProber):
+    def __init__(self) -> None:
+        super().__init__()
+        self._last_char_class = OTH
+        self._freq_counter: List[int] = []
+        self.reset()
+
+    def reset(self) -> None:
+        self._last_char_class = OTH
+        self._freq_counter = [0] * FREQ_CAT_NUM
+
+        # express the prior that MacRoman is a somewhat rare encoding;
+        # this can be done by starting out in a slightly improbable state
+        # that must be overcome
+        self._freq_counter[2] = 10
+
+        super().reset()
+
+    @property
+    def charset_name(self) -> str:
+        return "MacRoman"
+
+    @property
+    def language(self) -> str:
+        return ""
+
+    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
+        byte_str = self.remove_xml_tags(byte_str)
+        for c in byte_str:
+            char_class = MacRoman_CharToClass[c]
+            freq = MacRomanClassModel[(self._last_char_class * CLASS_NUM) + char_class]
+            if freq == 0:
+                self._state = ProbingState.NOT_ME
+                break
+            self._freq_counter[freq] += 1
+            self._last_char_class = char_class
+
+        return self.state
+
+    def get_confidence(self) -> float:
+        if self.state == ProbingState.NOT_ME:
+            return 0.01
+
+        total = sum(self._freq_counter)
+        confidence = (
+            0.0
+            if total < 0.01
+            else (self._freq_counter[3] - self._freq_counter[1] * 20.0) / total
+        )
+        confidence = max(confidence, 0.0)
+        # lower the confidence of MacRoman so that other more accurate
+        # detector can take priority.
+        confidence *= 0.73
+        return confidence
diff --git a/src/pip/_vendor/chardet/mbcharsetprober.py b/src/pip/_vendor/chardet/mbcharsetprober.py
index bf96ad5d4..666307e8f 100644
--- a/src/pip/_vendor/chardet/mbcharsetprober.py
+++ b/src/pip/_vendor/chardet/mbcharsetprober.py
@@ -27,8 +27,12 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from typing import Optional, Union
+
+from .chardistribution import CharDistributionAnalysis
 from .charsetprober import CharSetProber
-from .enums import MachineState, ProbingState
+from .codingstatemachine import CodingStateMachine
+from .enums import LanguageFilter, MachineState, ProbingState
 
 
 class MultiByteCharSetProber(CharSetProber):
@@ -36,29 +40,24 @@ class MultiByteCharSetProber(CharSetProber):
     MultiByteCharSetProber
     """
 
-    def __init__(self, lang_filter=None):
+    def __init__(self, lang_filter: LanguageFilter = LanguageFilter.NONE) -> None:
         super().__init__(lang_filter=lang_filter)
-        self.distribution_analyzer = None
-        self.coding_sm = None
-        self._last_char = [0, 0]
+        self.distribution_analyzer: Optional[CharDistributionAnalysis] = None
+        self.coding_sm: Optional[CodingStateMachine] = None
+        self._last_char = bytearray(b"\0\0")
 
-    def reset(self):
+    def reset(self) -> None:
         super().reset()
         if self.coding_sm:
             self.coding_sm.reset()
         if self.distribution_analyzer:
             self.distribution_analyzer.reset()
-        self._last_char = [0, 0]
-
-    @property
-    def charset_name(self):
-        raise NotImplementedError
+        self._last_char = bytearray(b"\0\0")
 
-    @property
-    def language(self):
-        raise NotImplementedError
+    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
+        assert self.coding_sm is not None
+        assert self.distribution_analyzer is not None
 
-    def feed(self, byte_str):
         for i, byte in enumerate(byte_str):
             coding_state = self.coding_sm.next_state(byte)
             if coding_state == MachineState.ERROR:
@@ -91,5 +90,6 @@ class MultiByteCharSetProber(CharSetProber):
 
         return self.state
 
-    def get_confidence(self):
+    def get_confidence(self) -> float:
+        assert self.distribution_analyzer is not None
         return self.distribution_analyzer.get_confidence()
diff --git a/src/pip/_vendor/chardet/mbcsgroupprober.py b/src/pip/_vendor/chardet/mbcsgroupprober.py
index 94488360c..6cb9cc7b3 100644
--- a/src/pip/_vendor/chardet/mbcsgroupprober.py
+++ b/src/pip/_vendor/chardet/mbcsgroupprober.py
@@ -30,6 +30,7 @@
 from .big5prober import Big5Prober
 from .charsetgroupprober import CharSetGroupProber
 from .cp949prober import CP949Prober
+from .enums import LanguageFilter
 from .eucjpprober import EUCJPProber
 from .euckrprober import EUCKRProber
 from .euctwprober import EUCTWProber
@@ -40,7 +41,7 @@ from .utf8prober import UTF8Prober
 
 
 class MBCSGroupProber(CharSetGroupProber):
-    def __init__(self, lang_filter=None):
+    def __init__(self, lang_filter: LanguageFilter = LanguageFilter.NONE) -> None:
         super().__init__(lang_filter=lang_filter)
         self.probers = [
             UTF8Prober(),
diff --git a/src/pip/_vendor/chardet/mbcssm.py b/src/pip/_vendor/chardet/mbcssm.py
index d3b9c4b75..7bbe97e66 100644
--- a/src/pip/_vendor/chardet/mbcssm.py
+++ b/src/pip/_vendor/chardet/mbcssm.py
@@ -25,6 +25,7 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from .codingstatemachinedict import CodingStateMachineDict
 from .enums import MachineState
 
 # BIG5
@@ -74,7 +75,7 @@ BIG5_ST = (
 
 BIG5_CHAR_LEN_TABLE = (0, 1, 1, 2, 0)
 
-BIG5_SM_MODEL = {
+BIG5_SM_MODEL: CodingStateMachineDict = {
     "class_table": BIG5_CLS,
     "class_factor": 5,
     "state_table": BIG5_ST,
@@ -117,7 +118,7 @@ CP949_ST = (
 
 CP949_CHAR_LEN_TABLE = (0, 1, 2, 0, 1, 1, 2, 2, 0, 2)
 
-CP949_SM_MODEL = {
+CP949_SM_MODEL: CodingStateMachineDict = {
     "class_table": CP949_CLS,
     "class_factor": 10,
     "state_table": CP949_ST,
@@ -173,7 +174,7 @@ EUCJP_ST = (
 
 EUCJP_CHAR_LEN_TABLE = (2, 2, 2, 3, 1, 0)
 
-EUCJP_SM_MODEL = {
+EUCJP_SM_MODEL: CodingStateMachineDict = {
     "class_table": EUCJP_CLS,
     "class_factor": 6,
     "state_table": EUCJP_ST,
@@ -226,7 +227,7 @@ EUCKR_ST = (
 
 EUCKR_CHAR_LEN_TABLE = (0, 1, 2, 0)
 
-EUCKR_SM_MODEL = {
+EUCKR_SM_MODEL: CodingStateMachineDict = {
     "class_table": EUCKR_CLS,
     "class_factor": 4,
     "state_table": EUCKR_ST,
@@ -283,7 +284,7 @@ JOHAB_ST = (
 
 JOHAB_CHAR_LEN_TABLE = (0, 1, 1, 1, 1, 0, 0, 2, 2, 2)
 
-JOHAB_SM_MODEL = {
+JOHAB_SM_MODEL: CodingStateMachineDict = {
     "class_table": JOHAB_CLS,
     "class_factor": 10,
     "state_table": JOHAB_ST,
@@ -340,7 +341,7 @@ EUCTW_ST = (
 
 EUCTW_CHAR_LEN_TABLE = (0, 0, 1, 2, 2, 2, 3)
 
-EUCTW_SM_MODEL = {
+EUCTW_SM_MODEL: CodingStateMachineDict = {
     "class_table": EUCTW_CLS,
     "class_factor": 7,
     "state_table": EUCTW_ST,
@@ -402,7 +403,7 @@ GB2312_ST = (
 # 2 here.
 GB2312_CHAR_LEN_TABLE = (0, 1, 1, 1, 1, 1, 2)
 
-GB2312_SM_MODEL = {
+GB2312_SM_MODEL: CodingStateMachineDict = {
     "class_table": GB2312_CLS,
     "class_factor": 7,
     "state_table": GB2312_ST,
@@ -458,7 +459,7 @@ SJIS_ST = (
 
 SJIS_CHAR_LEN_TABLE = (0, 1, 1, 2, 0, 0)
 
-SJIS_SM_MODEL = {
+SJIS_SM_MODEL: CodingStateMachineDict = {
     "class_table": SJIS_CLS,
     "class_factor": 6,
     "state_table": SJIS_ST,
@@ -516,7 +517,7 @@ UCS2BE_ST  = (
 
 UCS2BE_CHAR_LEN_TABLE = (2, 2, 2, 0, 2, 2)
 
-UCS2BE_SM_MODEL = {
+UCS2BE_SM_MODEL: CodingStateMachineDict = {
     "class_table": UCS2BE_CLS,
     "class_factor": 6,
     "state_table": UCS2BE_ST,
@@ -574,7 +575,7 @@ UCS2LE_ST = (
 
 UCS2LE_CHAR_LEN_TABLE = (2, 2, 2, 2, 2, 2)
 
-UCS2LE_SM_MODEL = {
+UCS2LE_SM_MODEL: CodingStateMachineDict = {
     "class_table": UCS2LE_CLS,
     "class_factor": 6,
     "state_table": UCS2LE_ST,
@@ -651,7 +652,7 @@ UTF8_ST = (
 
 UTF8_CHAR_LEN_TABLE = (0, 1, 0, 0, 0, 0, 2, 3, 3, 3, 4, 4, 5, 5, 6, 6)
 
-UTF8_SM_MODEL = {
+UTF8_SM_MODEL: CodingStateMachineDict = {
     "class_table": UTF8_CLS,
     "class_factor": 16,
     "state_table": UTF8_ST,
diff --git a/src/pip/_vendor/chardet/metadata/languages.py b/src/pip/_vendor/chardet/metadata/languages.py
index 1d37884c3..eb40c5f0c 100644
--- a/src/pip/_vendor/chardet/metadata/languages.py
+++ b/src/pip/_vendor/chardet/metadata/languages.py
@@ -6,6 +6,7 @@ This code is based on the language metadata from the uchardet project.
 """
 
 from string import ascii_letters
+from typing import List, Optional
 
 # TODO: Add Ukrainian (KOI8-U)
 
@@ -33,13 +34,13 @@ class Language:
 
     def __init__(
         self,
-        name=None,
-        iso_code=None,
-        use_ascii=True,
-        charsets=None,
-        alphabet=None,
-        wiki_start_pages=None,
-    ):
+        name: Optional[str] = None,
+        iso_code: Optional[str] = None,
+        use_ascii: bool = True,
+        charsets: Optional[List[str]] = None,
+        alphabet: Optional[str] = None,
+        wiki_start_pages: Optional[List[str]] = None,
+    ) -> None:
         super().__init__()
         self.name = name
         self.iso_code = iso_code
@@ -55,7 +56,7 @@ class Language:
         self.alphabet = "".join(sorted(set(alphabet))) if alphabet else None
         self.wiki_start_pages = wiki_start_pages
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         param_str = ", ".join(
             f"{k}={v!r}" for k, v in self.__dict__.items() if not k.startswith("_")
         )
@@ -103,7 +104,7 @@ LANGUAGES = {
         name="Danish",
         iso_code="da",
         use_ascii=True,
-        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252"],
+        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252", "MacRoman"],
         alphabet="æøåÆØÅ",
         wiki_start_pages=["Forside"],
     ),
@@ -111,8 +112,8 @@ LANGUAGES = {
         name="German",
         iso_code="de",
         use_ascii=True,
-        charsets=["ISO-8859-1", "WINDOWS-1252"],
-        alphabet="äöüßÄÖÜ",
+        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252", "MacRoman"],
+        alphabet="äöüßẞÄÖÜ",
         wiki_start_pages=["Wikipedia:Hauptseite"],
     ),
     "Greek": Language(
@@ -127,7 +128,7 @@ LANGUAGES = {
         name="English",
         iso_code="en",
         use_ascii=True,
-        charsets=["ISO-8859-1", "WINDOWS-1252"],
+        charsets=["ISO-8859-1", "WINDOWS-1252", "MacRoman"],
         wiki_start_pages=["Main_Page"],
     ),
     "Esperanto": Language(
@@ -143,7 +144,7 @@ LANGUAGES = {
         name="Spanish",
         iso_code="es",
         use_ascii=True,
-        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252"],
+        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252", "MacRoman"],
         alphabet="ñáéíóúüÑÁÉÍÓÚÜ",
         wiki_start_pages=["Wikipedia:Portada"],
     ),
@@ -161,7 +162,7 @@ LANGUAGES = {
         name="Finnish",
         iso_code="fi",
         use_ascii=True,
-        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252"],
+        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252", "MacRoman"],
         alphabet="ÅÄÖŠŽåäöšž",
         wiki_start_pages=["Wikipedia:Etusivu"],
     ),
@@ -169,7 +170,7 @@ LANGUAGES = {
         name="French",
         iso_code="fr",
         use_ascii=True,
-        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252"],
+        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252", "MacRoman"],
         alphabet="œàâçèéîïùûêŒÀÂÇÈÉÎÏÙÛÊ",
         wiki_start_pages=["Wikipédia:Accueil_principal", "Bœuf (animal)"],
     ),
@@ -203,7 +204,7 @@ LANGUAGES = {
         name="Italian",
         iso_code="it",
         use_ascii=True,
-        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252"],
+        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252", "MacRoman"],
         alphabet="ÀÈÉÌÒÓÙàèéìòóù",
         wiki_start_pages=["Pagina_principale"],
     ),
@@ -237,7 +238,7 @@ LANGUAGES = {
         name="Dutch",
         iso_code="nl",
         use_ascii=True,
-        charsets=["ISO-8859-1", "WINDOWS-1252"],
+        charsets=["ISO-8859-1", "WINDOWS-1252", "MacRoman"],
         wiki_start_pages=["Hoofdpagina"],
     ),
     "Polish": Language(
@@ -253,7 +254,7 @@ LANGUAGES = {
         name="Portuguese",
         iso_code="pt",
         use_ascii=True,
-        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252"],
+        charsets=["ISO-8859-1", "ISO-8859-15", "WINDOWS-1252", "MacRoman"],
         alphabet="ÁÂÃÀÇÉÊÍÓÔÕÚáâãàçéêíóôõú",
         wiki_start_pages=["Wikipédia:Página_principal"],
     ),
diff --git a/src/pip/_vendor/chardet/py.typed b/src/pip/_vendor/chardet/py.typed
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/src/pip/_vendor/chardet/py.typed
diff --git a/src/pip/_vendor/chardet/resultdict.py b/src/pip/_vendor/chardet/resultdict.py
new file mode 100644
index 000000000..7d36e64c4
--- /dev/null
+++ b/src/pip/_vendor/chardet/resultdict.py
@@ -0,0 +1,16 @@
+from typing import TYPE_CHECKING, Optional
+
+if TYPE_CHECKING:
+    # TypedDict was introduced in Python 3.8.
+    #
+    # TODO: Remove the else block and TYPE_CHECKING check when dropping support
+    # for Python 3.7.
+    from typing import TypedDict
+
+    class ResultDict(TypedDict):
+        encoding: Optional[str]
+        confidence: float
+        language: Optional[str]
+
+else:
+    ResultDict = dict
diff --git a/src/pip/_vendor/chardet/sbcharsetprober.py b/src/pip/_vendor/chardet/sbcharsetprober.py
index 31d70e154..0ffbcdd2c 100644
--- a/src/pip/_vendor/chardet/sbcharsetprober.py
+++ b/src/pip/_vendor/chardet/sbcharsetprober.py
@@ -26,23 +26,20 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
-from collections import namedtuple
+from typing import Dict, List, NamedTuple, Optional, Union
 
 from .charsetprober import CharSetProber
 from .enums import CharacterCategory, ProbingState, SequenceLikelihood
 
-SingleByteCharSetModel = namedtuple(
-    "SingleByteCharSetModel",
-    [
-        "charset_name",
-        "language",
-        "char_to_order_map",
-        "language_model",
-        "typical_positive_ratio",
-        "keep_ascii_letters",
-        "alphabet",
-    ],
-)
+
+class SingleByteCharSetModel(NamedTuple):
+    charset_name: str
+    language: str
+    char_to_order_map: Dict[int, int]
+    language_model: Dict[int, Dict[int, int]]
+    typical_positive_ratio: float
+    keep_ascii_letters: bool
+    alphabet: str
 
 
 class SingleByteCharSetProber(CharSetProber):
@@ -51,22 +48,27 @@ class SingleByteCharSetProber(CharSetProber):
     POSITIVE_SHORTCUT_THRESHOLD = 0.95
     NEGATIVE_SHORTCUT_THRESHOLD = 0.05
 
-    def __init__(self, model, is_reversed=False, name_prober=None):
+    def __init__(
+        self,
+        model: SingleByteCharSetModel,
+        is_reversed: bool = False,
+        name_prober: Optional[CharSetProber] = None,
+    ) -> None:
         super().__init__()
         self._model = model
         # TRUE if we need to reverse every pair in the model lookup
         self._reversed = is_reversed
         # Optional auxiliary prober for name decision
         self._name_prober = name_prober
-        self._last_order = None
-        self._seq_counters = None
-        self._total_seqs = None
-        self._total_char = None
-        self._control_char = None
-        self._freq_char = None
+        self._last_order = 255
+        self._seq_counters: List[int] = []
+        self._total_seqs = 0
+        self._total_char = 0
+        self._control_char = 0
+        self._freq_char = 0
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         super().reset()
         # char order of last character
         self._last_order = 255
@@ -78,18 +80,18 @@ class SingleByteCharSetProber(CharSetProber):
         self._freq_char = 0
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> Optional[str]:
         if self._name_prober:
             return self._name_prober.charset_name
         return self._model.charset_name
 
     @property
-    def language(self):
+    def language(self) -> Optional[str]:
         if self._name_prober:
             return self._name_prober.language
         return self._model.language
 
-    def feed(self, byte_str):
+    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
         # TODO: Make filter_international_words keep things in self.alphabet
         if not self._model.keep_ascii_letters:
             byte_str = self.filter_international_words(byte_str)
@@ -139,7 +141,7 @@ class SingleByteCharSetProber(CharSetProber):
 
         return self.state
 
-    def get_confidence(self):
+    def get_confidence(self) -> float:
         r = 0.01
         if self._total_seqs > 0:
             r = (
diff --git a/src/pip/_vendor/chardet/sbcsgroupprober.py b/src/pip/_vendor/chardet/sbcsgroupprober.py
index cad001cb1..890ae8465 100644
--- a/src/pip/_vendor/chardet/sbcsgroupprober.py
+++ b/src/pip/_vendor/chardet/sbcsgroupprober.py
@@ -48,7 +48,7 @@ from .sbcharsetprober import SingleByteCharSetProber
 
 
 class SBCSGroupProber(CharSetGroupProber):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         hebrew_prober = HebrewProber()
         logical_hebrew_prober = SingleByteCharSetProber(
diff --git a/src/pip/_vendor/chardet/sjisprober.py b/src/pip/_vendor/chardet/sjisprober.py
index 3bcbdb71d..91df07796 100644
--- a/src/pip/_vendor/chardet/sjisprober.py
+++ b/src/pip/_vendor/chardet/sjisprober.py
@@ -25,6 +25,8 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from typing import Union
+
 from .chardistribution import SJISDistributionAnalysis
 from .codingstatemachine import CodingStateMachine
 from .enums import MachineState, ProbingState
@@ -34,26 +36,29 @@ from .mbcssm import SJIS_SM_MODEL
 
 
 class SJISProber(MultiByteCharSetProber):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.coding_sm = CodingStateMachine(SJIS_SM_MODEL)
         self.distribution_analyzer = SJISDistributionAnalysis()
         self.context_analyzer = SJISContextAnalysis()
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         super().reset()
         self.context_analyzer.reset()
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
         return self.context_analyzer.charset_name
 
     @property
-    def language(self):
+    def language(self) -> str:
         return "Japanese"
 
-    def feed(self, byte_str):
+    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
+        assert self.coding_sm is not None
+        assert self.distribution_analyzer is not None
+
         for i, byte in enumerate(byte_str):
             coding_state = self.coding_sm.next_state(byte)
             if coding_state == MachineState.ERROR:
@@ -92,7 +97,9 @@ class SJISProber(MultiByteCharSetProber):
 
         return self.state
 
-    def get_confidence(self):
+    def get_confidence(self) -> float:
+        assert self.distribution_analyzer is not None
+
         context_conf = self.context_analyzer.get_confidence()
         distrib_conf = self.distribution_analyzer.get_confidence()
         return max(context_conf, distrib_conf)
diff --git a/src/pip/_vendor/chardet/universaldetector.py b/src/pip/_vendor/chardet/universaldetector.py
index 22fcf8290..30c441dc2 100644
--- a/src/pip/_vendor/chardet/universaldetector.py
+++ b/src/pip/_vendor/chardet/universaldetector.py
@@ -39,12 +39,16 @@ class a user of ``chardet`` should use.
 import codecs
 import logging
 import re
+from typing import List, Optional, Union
 
 from .charsetgroupprober import CharSetGroupProber
+from .charsetprober import CharSetProber
 from .enums import InputState, LanguageFilter, ProbingState
 from .escprober import EscCharSetProber
 from .latin1prober import Latin1Prober
+from .macromanprober import MacRomanProber
 from .mbcsgroupprober import MBCSGroupProber
+from .resultdict import ResultDict
 from .sbcsgroupprober import SBCSGroupProber
 from .utf1632prober import UTF1632Prober
 
@@ -80,34 +84,55 @@ class UniversalDetector:
         "iso-8859-9": "Windows-1254",
         "iso-8859-13": "Windows-1257",
     }
+    # Based on https://encoding.spec.whatwg.org/#names-and-labels
+    # but altered to match Python names for encodings and remove mappings
+    # that break tests.
+    LEGACY_MAP = {
+        "ascii": "Windows-1252",
+        "iso-8859-1": "Windows-1252",
+        "tis-620": "ISO-8859-11",
+        "iso-8859-9": "Windows-1254",
+        "gb2312": "GB18030",
+        "euc-kr": "CP949",
+        "utf-16le": "UTF-16",
+    }
 
-    def __init__(self, lang_filter=LanguageFilter.ALL):
-        self._esc_charset_prober = None
-        self._utf1632_prober = None
-        self._charset_probers = []
-        self.result = None
-        self.done = None
-        self._got_data = None
-        self._input_state = None
-        self._last_char = None
+    def __init__(
+        self,
+        lang_filter: LanguageFilter = LanguageFilter.ALL,
+        should_rename_legacy: bool = False,
+    ) -> None:
+        self._esc_charset_prober: Optional[EscCharSetProber] = None
+        self._utf1632_prober: Optional[UTF1632Prober] = None
+        self._charset_probers: List[CharSetProber] = []
+        self.result: ResultDict = {
+            "encoding": None,
+            "confidence": 0.0,
+            "language": None,
+        }
+        self.done = False
+        self._got_data = False
+        self._input_state = InputState.PURE_ASCII
+        self._last_char = b""
         self.lang_filter = lang_filter
         self.logger = logging.getLogger(__name__)
-        self._has_win_bytes = None
+        self._has_win_bytes = False
+        self.should_rename_legacy = should_rename_legacy
         self.reset()
 
     @property
-    def input_state(self):
+    def input_state(self) -> int:
         return self._input_state
 
     @property
-    def has_win_bytes(self):
+    def has_win_bytes(self) -> bool:
         return self._has_win_bytes
 
     @property
-    def charset_probers(self):
+    def charset_probers(self) -> List[CharSetProber]:
         return self._charset_probers
 
-    def reset(self):
+    def reset(self) -> None:
         """
         Reset the UniversalDetector and all of its probers back to their
         initial states.  This is called by ``__init__``, so you only need to
@@ -126,7 +151,7 @@ class UniversalDetector:
         for prober in self._charset_probers:
             prober.reset()
 
-    def feed(self, byte_str):
+    def feed(self, byte_str: Union[bytes, bytearray]) -> None:
         """
         Takes a chunk of a document and feeds it through all of the relevant
         charset probers.
@@ -166,6 +191,7 @@ class UniversalDetector:
             elif byte_str.startswith(b"\xFE\xFF\x00\x00"):
                 # FE FF 00 00  UCS-4, unusual octet order BOM (3412)
                 self.result = {
+                    # TODO: This encoding is not supported by Python. Should remove?
                     "encoding": "X-ISO-10646-UCS-4-3412",
                     "confidence": 1.0,
                     "language": "",
@@ -173,6 +199,7 @@ class UniversalDetector:
             elif byte_str.startswith(b"\x00\x00\xFF\xFE"):
                 # 00 00 FF FE  UCS-4, unusual octet order BOM (2143)
                 self.result = {
+                    # TODO: This encoding is not supported by Python. Should remove?
                     "encoding": "X-ISO-10646-UCS-4-2143",
                     "confidence": 1.0,
                     "language": "",
@@ -242,6 +269,7 @@ class UniversalDetector:
                 if self.lang_filter & LanguageFilter.NON_CJK:
                     self._charset_probers.append(SBCSGroupProber())
                 self._charset_probers.append(Latin1Prober())
+                self._charset_probers.append(MacRomanProber())
             for prober in self._charset_probers:
                 if prober.feed(byte_str) == ProbingState.FOUND_IT:
                     self.result = {
@@ -254,7 +282,7 @@ class UniversalDetector:
             if self.WIN_BYTE_DETECTOR.search(byte_str):
                 self._has_win_bytes = True
 
-    def close(self):
+    def close(self) -> ResultDict:
         """
         Stop analyzing the current document and come up with a final
         prediction.
@@ -288,7 +316,8 @@ class UniversalDetector:
                     max_prober = prober
             if max_prober and (max_prober_confidence > self.MINIMUM_THRESHOLD):
                 charset_name = max_prober.charset_name
-                lower_charset_name = max_prober.charset_name.lower()
+                assert charset_name is not None
+                lower_charset_name = charset_name.lower()
                 confidence = max_prober.get_confidence()
                 # Use Windows encoding name instead of ISO-8859 if we saw any
                 # extra Windows-specific bytes
@@ -297,6 +326,11 @@ class UniversalDetector:
                         charset_name = self.ISO_WIN_MAP.get(
                             lower_charset_name, charset_name
                         )
+                # Rename legacy encodings with superset encodings if asked
+                if self.should_rename_legacy:
+                    charset_name = self.LEGACY_MAP.get(
+                        (charset_name or "").lower(), charset_name
+                    )
                 self.result = {
                     "encoding": charset_name,
                     "confidence": confidence,
diff --git a/src/pip/_vendor/chardet/utf1632prober.py b/src/pip/_vendor/chardet/utf1632prober.py
index 9fd1580b8..6bdec63d6 100644
--- a/src/pip/_vendor/chardet/utf1632prober.py
+++ b/src/pip/_vendor/chardet/utf1632prober.py
@@ -18,6 +18,8 @@
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
+from typing import List, Union
+
 from .charsetprober import CharSetProber
 from .enums import ProbingState
 
@@ -36,7 +38,7 @@ class UTF1632Prober(CharSetProber):
     # a fixed constant ratio of expected zeros or non-zeros in modulo-position.
     EXPECTED_RATIO = 0.94
 
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.position = 0
         self.zeros_at_mod = [0] * 4
@@ -51,7 +53,7 @@ class UTF1632Prober(CharSetProber):
         self.first_half_surrogate_pair_detected_16le = False
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         super().reset()
         self.position = 0
         self.zeros_at_mod = [0] * 4
@@ -66,7 +68,7 @@ class UTF1632Prober(CharSetProber):
         self.quad = [0, 0, 0, 0]
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
         if self.is_likely_utf32be():
             return "utf-32be"
         if self.is_likely_utf32le():
@@ -79,16 +81,16 @@ class UTF1632Prober(CharSetProber):
         return "utf-16"
 
     @property
-    def language(self):
+    def language(self) -> str:
         return ""
 
-    def approx_32bit_chars(self):
+    def approx_32bit_chars(self) -> float:
         return max(1.0, self.position / 4.0)
 
-    def approx_16bit_chars(self):
+    def approx_16bit_chars(self) -> float:
         return max(1.0, self.position / 2.0)
 
-    def is_likely_utf32be(self):
+    def is_likely_utf32be(self) -> bool:
         approx_chars = self.approx_32bit_chars()
         return approx_chars >= self.MIN_CHARS_FOR_DETECTION and (
             self.zeros_at_mod[0] / approx_chars > self.EXPECTED_RATIO
@@ -98,7 +100,7 @@ class UTF1632Prober(CharSetProber):
             and not self.invalid_utf32be
         )
 
-    def is_likely_utf32le(self):
+    def is_likely_utf32le(self) -> bool:
         approx_chars = self.approx_32bit_chars()
         return approx_chars >= self.MIN_CHARS_FOR_DETECTION and (
             self.nonzeros_at_mod[0] / approx_chars > self.EXPECTED_RATIO
@@ -108,7 +110,7 @@ class UTF1632Prober(CharSetProber):
             and not self.invalid_utf32le
         )
 
-    def is_likely_utf16be(self):
+    def is_likely_utf16be(self) -> bool:
         approx_chars = self.approx_16bit_chars()
         return approx_chars >= self.MIN_CHARS_FOR_DETECTION and (
             (self.nonzeros_at_mod[1] + self.nonzeros_at_mod[3]) / approx_chars
@@ -118,7 +120,7 @@ class UTF1632Prober(CharSetProber):
             and not self.invalid_utf16be
         )
 
-    def is_likely_utf16le(self):
+    def is_likely_utf16le(self) -> bool:
         approx_chars = self.approx_16bit_chars()
         return approx_chars >= self.MIN_CHARS_FOR_DETECTION and (
             (self.nonzeros_at_mod[0] + self.nonzeros_at_mod[2]) / approx_chars
@@ -128,7 +130,7 @@ class UTF1632Prober(CharSetProber):
             and not self.invalid_utf16le
         )
 
-    def validate_utf32_characters(self, quad):
+    def validate_utf32_characters(self, quad: List[int]) -> None:
         """
         Validate if the quad of bytes is valid UTF-32.
 
@@ -150,7 +152,7 @@ class UTF1632Prober(CharSetProber):
         ):
             self.invalid_utf32le = True
 
-    def validate_utf16_characters(self, pair):
+    def validate_utf16_characters(self, pair: List[int]) -> None:
         """
         Validate if the pair of bytes is  valid UTF-16.
 
@@ -182,7 +184,7 @@ class UTF1632Prober(CharSetProber):
             else:
                 self.invalid_utf16le = True
 
-    def feed(self, byte_str):
+    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
         for c in byte_str:
             mod4 = self.position % 4
             self.quad[mod4] = c
@@ -198,7 +200,7 @@ class UTF1632Prober(CharSetProber):
         return self.state
 
     @property
-    def state(self):
+    def state(self) -> ProbingState:
         if self._state in {ProbingState.NOT_ME, ProbingState.FOUND_IT}:
             # terminal, decided states
             return self._state
@@ -210,7 +212,7 @@ class UTF1632Prober(CharSetProber):
             self._state = ProbingState.NOT_ME
         return self._state
 
-    def get_confidence(self):
+    def get_confidence(self) -> float:
         return (
             0.85
             if (
diff --git a/src/pip/_vendor/chardet/utf8prober.py b/src/pip/_vendor/chardet/utf8prober.py
index 3aae09e86..d96354d97 100644
--- a/src/pip/_vendor/chardet/utf8prober.py
+++ b/src/pip/_vendor/chardet/utf8prober.py
@@ -25,6 +25,8 @@
 # 02110-1301  USA
 ######################### END LICENSE BLOCK #########################
 
+from typing import Union
+
 from .charsetprober import CharSetProber
 from .codingstatemachine import CodingStateMachine
 from .enums import MachineState, ProbingState
@@ -34,26 +36,26 @@ from .mbcssm import UTF8_SM_MODEL
 class UTF8Prober(CharSetProber):
     ONE_CHAR_PROB = 0.5
 
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self.coding_sm = CodingStateMachine(UTF8_SM_MODEL)
-        self._num_mb_chars = None
+        self._num_mb_chars = 0
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         super().reset()
         self.coding_sm.reset()
         self._num_mb_chars = 0
 
     @property
-    def charset_name(self):
+    def charset_name(self) -> str:
         return "utf-8"
 
     @property
-    def language(self):
+    def language(self) -> str:
         return ""
 
-    def feed(self, byte_str):
+    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
         for c in byte_str:
             coding_state = self.coding_sm.next_state(c)
             if coding_state == MachineState.ERROR:
@@ -72,7 +74,7 @@ class UTF8Prober(CharSetProber):
 
         return self.state
 
-    def get_confidence(self):
+    def get_confidence(self) -> float:
         unlike = 0.99
         if self._num_mb_chars < 6:
             unlike *= self.ONE_CHAR_PROB**self._num_mb_chars
diff --git a/src/pip/_vendor/chardet/version.py b/src/pip/_vendor/chardet/version.py
index a08a06b9a..c5e9d85cd 100644
--- a/src/pip/_vendor/chardet/version.py
+++ b/src/pip/_vendor/chardet/version.py
@@ -1,9 +1,9 @@
 """
 This module exists only to simplify retrieving the version number of chardet
-from within setup.py and from chardet subpackages.
+from within setuptools and from chardet subpackages.
 
 :author: Dan Blanchard (dan.blanchard@gmail.com)
 """
 
-__version__ = "5.0.0"
+__version__ = "5.1.0"
 VERSION = __version__.split(".")
diff --git a/src/pip/_vendor/vendor.txt b/src/pip/_vendor/vendor.txt
index cd42578f4..31cda4a80 100644
--- a/src/pip/_vendor/vendor.txt
+++ b/src/pip/_vendor/vendor.txt
@@ -9,7 +9,7 @@ pyparsing==3.0.9
 pyproject-hooks==1.0.0
 requests==2.28.2
     certifi==2022.12.7
-    chardet==5.0.0
+    chardet==5.1.0
     idna==3.4
     urllib3==1.26.12
 rich==12.6.0