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78 lines
2.7 KiB
Python
78 lines
2.7 KiB
Python
"""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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