Mercurial > cpython-lru_cache-weakref

annotate Lib/macurl2path.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 536f24e16af2
children 5fda64d39540 4cdf21a0dbbc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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4a23cc49e2b0 Actually, the previous batch's comment should have been different;
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1 """Macintosh-specific module for conversion between pathnames and URLs.
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2
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3 Do not import directly; use urllib instead."""
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4
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5 import urllib
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6 import os
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7
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8 __all__ = ["url2pathname","pathname2url"]
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9
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10 def url2pathname(pathname):
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11 """OS-specific conversion from a relative URL of the 'file' scheme
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12 to a file system path; not recommended for general use."""
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13 #
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14 # XXXX The .. handling should be fixed...
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15 #
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16 tp = urllib.splittype(pathname)[0]
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17 if tp and tp != 'file':
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18 raise RuntimeError, 'Cannot convert non-local URL to pathname'
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19 # Turn starting /// into /, an empty hostname means current host
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20 if pathname[:3] == '///':
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21 pathname = pathname[2:]
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22 elif pathname[:2] == '//':
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23 raise RuntimeError, 'Cannot convert non-local URL to pathname'
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24 components = pathname.split('/')
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25 # Remove . and embedded ..
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26 i = 0
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27 while i < len(components):
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28 if components[i] == '.':
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29 del components[i]
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30 elif components[i] == '..' and i > 0 and \
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31 components[i-1] not in ('', '..'):
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32 del components[i-1:i+1]
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33 i = i-1
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34 elif components[i] == '' and i > 0 and components[i-1] != '':
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35 del components[i]
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36 else:
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37 i = i+1
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38 if not components[0]:
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39 # Absolute unix path, don't start with colon
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40 rv = ':'.join(components[1:])
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41 else:
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42 # relative unix path, start with colon. First replace
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43 # leading .. by empty strings (giving ::file)
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44 i = 0
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45 while i < len(components) and components[i] == '..':
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46 components[i] = ''
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47 i = i + 1
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48 rv = ':' + ':'.join(components)
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49 # and finally unquote slashes and other funny characters
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50 return urllib.unquote(rv)
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51
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52 def pathname2url(pathname):
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53 """OS-specific conversion from a file system path to a relative URL
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54 of the 'file' scheme; not recommended for general use."""
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55 if '/' in pathname:
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56 raise RuntimeError, "Cannot convert pathname containing slashes"
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57 components = pathname.split(':')
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58 # Remove empty first and/or last component
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59 if components[0] == '':
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60 del components[0]
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61 if components[-1] == '':
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62 del components[-1]
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63 # Replace empty string ('::') by .. (will result in '/../' later)
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64 for i in range(len(components)):
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65 if components[i] == '':
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66 components[i] = '..'
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67 # Truncate names longer than 31 bytes
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68 components = map(_pncomp2url, components)
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69
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70 if os.path.isabs(pathname):
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71 return '/' + '/'.join(components)
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72 else:
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73 return '/'.join(components)
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74
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75 def _pncomp2url(component):
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76 component = urllib.quote(component[:31], safe='') # We want to quote slashes
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77 return component
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78
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79 def test():
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80 for url in ["index.html",
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81 "bar/index.html",
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82 "/foo/bar/index.html",
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83 "/foo/bar/",
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84 "/"]:
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85 print '%r -> %r' % (url, url2pathname(url))
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86 for path in ["drive:",
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87 "drive:dir:",
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88 "drive:dir:file",
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89 "drive:file",
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90 "file",
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91 ":file",
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92 ":dir:",
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93 ":dir:file"]:
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94 print '%r -> %r' % (path, pathname2url(path))
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95
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96 if __name__ == '__main__':
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97 test()