from .core import encode, decode, alabel, ulabel, IDNAError
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import codecs
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import re
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from typing import Tuple, Optional
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_unicode_dots_re = re.compile('[\u002e\u3002\uff0e\uff61]')
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class Codec(codecs.Codec):
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def encode(self, data: str, errors: str = 'strict') -> Tuple[bytes, int]:
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if errors != 'strict':
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raise IDNAError('Unsupported error handling \"{}\"'.format(errors))
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if not data:
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return b"", 0
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return encode(data), len(data)
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def decode(self, data: bytes, errors: str = 'strict') -> Tuple[str, int]:
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if errors != 'strict':
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raise IDNAError('Unsupported error handling \"{}\"'.format(errors))
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if not data:
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return '', 0
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return decode(data), len(data)
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class IncrementalEncoder(codecs.BufferedIncrementalEncoder):
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def _buffer_encode(self, data: str, errors: str, final: bool) -> Tuple[str, int]: # type: ignore
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if errors != 'strict':
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raise IDNAError('Unsupported error handling \"{}\"'.format(errors))
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if not data:
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return "", 0
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labels = _unicode_dots_re.split(data)
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trailing_dot = ''
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if labels:
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if not labels[-1]:
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trailing_dot = '.'
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del labels[-1]
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elif not final:
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# Keep potentially unfinished label until the next call
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del labels[-1]
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if labels:
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trailing_dot = '.'
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result = []
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size = 0
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for label in labels:
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result.append(alabel(label))
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if size:
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size += 1
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size += len(label)
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# Join with U+002E
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result_str = '.'.join(result) + trailing_dot # type: ignore
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size += len(trailing_dot)
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return result_str, size
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class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
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def _buffer_decode(self, data: str, errors: str, final: bool) -> Tuple[str, int]: # type: ignore
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if errors != 'strict':
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raise IDNAError('Unsupported error handling \"{}\"'.format(errors))
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if not data:
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return ('', 0)
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labels = _unicode_dots_re.split(data)
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trailing_dot = ''
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if labels:
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if not labels[-1]:
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trailing_dot = '.'
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del labels[-1]
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elif not final:
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# Keep potentially unfinished label until the next call
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del labels[-1]
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if labels:
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trailing_dot = '.'
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result = []
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size = 0
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for label in labels:
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result.append(ulabel(label))
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if size:
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size += 1
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size += len(label)
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result_str = '.'.join(result) + trailing_dot
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size += len(trailing_dot)
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return (result_str, size)
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class StreamWriter(Codec, codecs.StreamWriter):
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pass
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class StreamReader(Codec, codecs.StreamReader):
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pass
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def getregentry() -> codecs.CodecInfo:
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# Compatibility as a search_function for codecs.register()
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return codecs.CodecInfo(
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name='idna',
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encode=Codec().encode, # type: ignore
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decode=Codec().decode, # type: ignore
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incrementalencoder=IncrementalEncoder,
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incrementaldecoder=IncrementalDecoder,
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streamwriter=StreamWriter,
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streamreader=StreamReader,
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)
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