"""Macintosh-specific module for conversion between pathnames and URLs.

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Do not import directly; use urllib instead."""

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import urllib.parse

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import os

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__all__ = ["url2pathname","pathname2url"]

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def url2pathname(pathname):

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"""OS-specific conversion from a relative URL of the 'file' scheme

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to a file system path; not recommended for general use."""

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#

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# XXXX The .. handling should be fixed...

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#

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tp = urllib.parse.splittype(pathname)[0]

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if tp and tp != 'file':

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raise RuntimeError('Cannot convert non-local URL to pathname')

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# Turn starting /// into /, an empty hostname means current host

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if pathname[:3] == '///':

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pathname = pathname[2:]

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elif pathname[:2] == '//':

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raise RuntimeError('Cannot convert non-local URL to pathname')

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components = pathname.split('/')

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# Remove . and embedded ..

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i = 0

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while i < len(components):

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if components[i] == '.':

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del components[i]

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elif components[i] == '..' and i > 0 and \

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components[i-1] not in ('', '..'):

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del components[i-1:i+1]

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i = i-1

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elif components[i] == '' and i > 0 and components[i-1] != '':

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del components[i]

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else:

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i = i+1

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if not components[0]:

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# Absolute unix path, don't start with colon

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rv = ':'.join(components[1:])

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else:

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# relative unix path, start with colon. First replace

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# leading .. by empty strings (giving ::file)

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i = 0

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while i < len(components) and components[i] == '..':

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components[i] = ''

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i = i + 1

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rv = ':' + ':'.join(components)

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# and finally unquote slashes and other funny characters

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return urllib.parse.unquote(rv)

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def pathname2url(pathname):

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"""OS-specific conversion from a file system path to a relative URL

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of the 'file' scheme; not recommended for general use."""

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if '/' in pathname:

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raise RuntimeError("Cannot convert pathname containing slashes")

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components = pathname.split(':')

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# Remove empty first and/or last component

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if components[0] == '':

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del components[0]

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if components[-1] == '':

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del components[-1]

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# Replace empty string ('::') by .. (will result in '/../' later)

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for i in range(len(components)):

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if components[i] == '':

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components[i] = '..'

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# Truncate names longer than 31 bytes

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components = map(_pncomp2url, components)

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if os.path.isabs(pathname):

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return '/' + '/'.join(components)

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else:

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return '/'.join(components)

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def _pncomp2url(component):

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# We want to quote slashes

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return urllib.parse.quote(component[:31], safe='')

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