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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)