Mercurial > cpython-lru_cache-weakref

annotate Lib/urlparse.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 728a39a3e0d5
children d87e87853958
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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00ca900c7742 Update reference (it's now RFC 1808); added http to list of protocols
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1 # Parse (absolute and relative) URLs. See RFC 1808: "Relative Uniform
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2 # Resource Locators", by R. Fielding, UC Irvine, June 1995.
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3
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4 # Standard/builtin Python modules
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5 import string
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6 from string import joinfields, splitfields, find, rfind
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7
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8 # A classification of schemes ('' means apply by default)
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9 uses_relative = ['ftp', 'http', 'gopher', 'nntp', 'wais', 'file',
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10 'prospero', '']
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11 uses_netloc = ['ftp', 'http', 'gopher', 'nntp', 'telnet', 'wais',
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12 'prospero', '']
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13 non_hierarchical = ['gopher', 'hdl', 'mailto', 'news', 'telnet', 'wais']
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14 uses_params = ['ftp', 'hdl', 'prospero', 'http', '']
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15 uses_query = ['http', 'wais', '']
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16 uses_fragment = ['ftp', 'hdl', 'http', 'gopher', 'news', 'nntp', 'wais',
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17 'file', 'prospero', '']
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18
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19 # Characters valid in scheme names
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20 scheme_chars = string.letters + string.digits + '+-.'
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21
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22 _parse_cache = {}
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23
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24 def clear_cache():
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25 global _parse_cache
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26 _parse_cache = {}
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27
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28
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29 # Parse a URL into 6 components:
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30 # <scheme>://<netloc>/<path>;<params>?<query>#<fragment>
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31 # Return a 6-tuple: (scheme, netloc, path, params, query, fragment).
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32 # Note that we don't break the components up in smaller bits
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33 # (e.g. netloc is a single string) and we don't expand % escapes.
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34 def urlparse(url, scheme = '', allow_framents = 1):
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35 key = url, scheme, allow_framents
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36 if _parse_cache.has_key(key):
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37 return _parse_cache[key]
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38 netloc = path = params = query = fragment = ''
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39 i = string.find(url, ':')
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40 if i > 0:
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41 for c in url[:i]:
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42 if c not in scheme_chars:
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43 break
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44 else:
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45 scheme, url = string.lower(url[:i]), url[i+1:]
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46 if scheme in uses_netloc:
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47 if url[:2] == '//':
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48 i = string.find(url, '/', 2)
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49 if i < 0:
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50 i = len(url)
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51 netloc, url = url[2:i], url[i:]
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52 if allow_framents and scheme in uses_fragment:
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53 i = string.rfind(url, '#')
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54 if i >= 0:
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55 url, fragment = url[:i], url[i+1:]
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56 if scheme in uses_query:
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57 i = string.find(url, '?')
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58 if i >= 0:
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59 url, query = url[:i], url[i+1:]
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60 if scheme in uses_params:
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61 i = string.find(url, ';')
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62 if i >= 0:
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63 url, params = url[:i], url[i+1:]
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64 tuple = scheme, netloc, url, params, query, fragment
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65 _parse_cache[key] = tuple
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66 return tuple
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67
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68 # Put a parsed URL back together again. This may result in a slightly
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69 # different, but equivalent URL, if the URL that was parsed originally
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70 # had redundant delimiters, e.g. a ? with an empty query (the draft
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71 # states that these are equivalent).
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72 def urlunparse((scheme, netloc, url, params, query, fragment)):
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73 if netloc:
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74 if url[:1] != '/': url = '/' + url
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75 url = '//' + netloc + url
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76 if scheme:
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77 url = scheme + ':' + url
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78 if params:
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79 url = url + ';' + params
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80 if query:
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81 url = url + '?' + query
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82 if fragment:
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83 url = url + '#' + fragment
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84 return url
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85
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86 # Join a base URL and a possibly relative URL to form an absolute
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87 # interpretation of the latter.
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88 def urljoin(base, url, allow_framents = 1):
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89 if not base:
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90 return url
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91 bscheme, bnetloc, bpath, bparams, bquery, bfragment = \
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92 urlparse(base, '', allow_framents)
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93 scheme, netloc, path, params, query, fragment = \
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94 urlparse(url, bscheme, allow_framents)
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95 # XXX Unofficial hack: default netloc to bnetloc even if
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96 # schemes differ
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97 if scheme != bscheme and not netloc and \
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98 scheme in uses_relative and bscheme in uses_relative and \
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99 scheme in uses_netloc and bscheme in uses_netloc:
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100 netloc = bnetloc
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101 # Strip the port number
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102 i = find(netloc, '@')
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103 if i < 0: i = 0
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104 i = find(netloc, ':', i)
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105 if i >= 0:
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106 netloc = netloc[:i]
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107 if scheme != bscheme or scheme not in uses_relative:
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108 return urlunparse((scheme, netloc, path,
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109 params, query, fragment))
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110 if scheme in uses_netloc:
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111 if netloc:
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112 return urlunparse((scheme, netloc, path,
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113 params, query, fragment))
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114 netloc = bnetloc
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115 if path[:1] == '/':
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116 return urlunparse((scheme, netloc, path,
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117 params, query, fragment))
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118 if not path:
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119 return urlunparse((scheme, netloc, bpath,
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120 params, query or bquery, fragment))
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121 i = rfind(bpath, '/')
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122 if i >= 0:
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123 path = bpath[:i] + '/' + path
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124 segments = splitfields(path, '/')
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125 if segments[-1] == '.':
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126 segments[-1] = ''
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127 while '.' in segments:
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128 segments.remove('.')
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129 while 1:
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130 i = 1
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131 n = len(segments) - 1
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132 while i < n:
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133 if segments[i] == '..' and segments[i-1]:
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134 del segments[i-1:i+1]
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135 break
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136 i = i+1
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137 else:
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138 break
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139 if len(segments) >= 2 and segments[-1] == '..':
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140 segments[-2:] = ['']
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141 return urlunparse((scheme, netloc, joinfields(segments, '/'),
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142 params, query, fragment))
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143
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144 def urldefrag(url):
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145 """Removes any existing fragment from URL.
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146
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147 Returns a tuple of the defragmented URL and the fragment. If
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148 the URL contained no fragments, the second element is the
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149 empty string.
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150 """
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151 s, n, p, a, q, frag = urlparse(url)
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152 defrag = urlunparse((s, n, p, a, q, ''))
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153 return defrag, frag
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154
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155
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156 test_input = """
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157 http://a/b/c/d
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158
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159 g:h = <URL:g:h>
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160 http:g = <URL:http://a/b/c/g>
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161 http: = <URL:http://a/b/c/d>
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162 g = <URL:http://a/b/c/g>
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163 ./g = <URL:http://a/b/c/g>
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164 g/ = <URL:http://a/b/c/g/>
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165 /g = <URL:http://a/g>
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166 //g = <URL:http://g>
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167 ?y = <URL:http://a/b/c/d?y>
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168 g?y = <URL:http://a/b/c/g?y>
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169 g?y/./x = <URL:http://a/b/c/g?y/./x>
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170 . = <URL:http://a/b/c/>
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171 ./ = <URL:http://a/b/c/>
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172 .. = <URL:http://a/b/>
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173 ../ = <URL:http://a/b/>
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174 ../g = <URL:http://a/b/g>
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175 ../.. = <URL:http://a/>
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176 ../../g = <URL:http://a/g>
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177 ../../../g = <URL:http://a/../g>
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178 ./../g = <URL:http://a/b/g>
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179 ./g/. = <URL:http://a/b/c/g/>
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180 /./g = <URL:http://a/./g>
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181 g/./h = <URL:http://a/b/c/g/h>
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182 g/../h = <URL:http://a/b/c/h>
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183 http:g = <URL:http://a/b/c/g>
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184 http: = <URL:http://a/b/c/d>
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185 """
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186
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187 def test():
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188 import sys
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189 base = ''
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190 if sys.argv[1:]:
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191 fn = sys.argv[1]
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192 if fn == '-':
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193 fp = sys.stdin
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194 else:
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195 fp = open(fn)
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196 else:
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197 import StringIO
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198 fp = StringIO.StringIO(test_input)
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199 while 1:
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200 line = fp.readline()
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201 if not line: break
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202 words = string.split(line)
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203 if not words:
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204 continue
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205 url = words[0]
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206 parts = urlparse(url)
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207 print '%-10s : %s' % (url, parts)
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208 abs = urljoin(base, url)
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209 if not base:
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210 base = abs
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211 wrapped = '<URL:%s>' % abs
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212 print '%-10s = %s' % (url, wrapped)
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213 if len(words) == 3 and words[1] == '=':
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214 if wrapped != words[2]:
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215 print 'EXPECTED', words[2], '!!!!!!!!!!'
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216
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217 if __name__ == '__main__':
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218 test()