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                                                                                                                                                                                     import codecs
import re
from typing import Any, Optional, Tuple

from .core import IDNAError, alabel, decode, encode, ulabel

_unicode_dots_re = re.compile("[\u002e\u3002\uff0e\uff61]")


class Codec(codecs.Codec):
    def encode(self, data: str, errors: str = "strict") -> Tuple[bytes, int]:
        if errors != "strict":
            raise IDNAError('Unsupported error handling "{}"'.format(errors))

        if not data:
            return b"", 0

        return encode(data), len(data)

    def decode(self, data: bytes, errors: str = "strict") -> Tuple[str, int]:
        if errors != "strict":
            raise IDNAError('Unsupported error handling "{}"'.format(errors))

        if not data:
            return "", 0

        return decode(data), len(data)


class IncrementalEncoder(codecs.BufferedIncrementalEncoder):
    def _buffer_encode(self, data: str, errors: str, final: bool) -> Tuple[bytes, int]:
        if errors != "strict":
            raise IDNAError('Unsupported error handling "{}"'.format(errors))

        if not data:
            return b"", 0

        labels = _unicode_dots_re.split(data)
        trailing_dot = b""
        if labels:
            if not labels[-1]:
                trailing_dot = b"."
                del labels[-1]
            elif not final:
                # Keep potentially unfinished label until the next call
                del labels[-1]
                if labels:
                    trailing_dot = b"."

        result = []
        size = 0
        for label in labels:
            result.append(alabel(label))
            if size:
                size += 1
            size += len(label)

        # Join with U+002E
        result_bytes = b".".join(result) + trailing_dot
        size += len(trailing_dot)
        return result_bytes, size


class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
    def _buffer_decode(self, data: Any, errors: str, final: bool) -> Tuple[str, int]:
        if errors != "strict":
            raise IDNAError('Unsupported error handling "{}"'.format(errors))

        if not data:
            return ("", 0)

        if not isinstance(data, str):
            data = str(data, "ascii")

        labels = _unicode_dots_re.split(data)
        trailing_dot = ""
        if labels:
            if not labels[-1]:
                trailing_dot = "."
                del labels[-1]
            elif not final:
                # Keep potentially unfinished label until the next call
                del labels[-1]
                if labels:
                    trailing_dot = "."

        result = []
        size = 0
        for label in labels:
            result.append(ulabel(label))
            if size:
                size += 1
            size += len(label)

        result_str = ".".join(result) + trailing_dot
        size += len(trailing_dot)
        return (result_str, size)


class StreamWriter(Codec, codecs.StreamWriter):
    pass


class StreamReader(Codec, codecs.StreamReader):
    pass


def search_function(name: str) -> Optional[codecs.CodecInfo]:
    if name != "idna2008":
        return None
    return codecs.CodecInfo(
        name=name,
        encode=Codec().encode,
        decode=Codec().decode,
        incrementalencoder=IncrementalEncoder,
        incrementaldecoder=IncrementalDecoder,
        streamwriter=StreamWriter,
        streamreader=StreamReader,
    )


codecs.register(search_function)