d0df704d8a
added python.path vm arg to startup script fixed infinite loop in unwrap() when displaying sequences of sequences git-svn-id: http://google-refine.googlecode.com/svn/trunk@509 7d457c2a-affb-35e4-300a-418c747d4874
381 lines
16 KiB
Python
381 lines
16 KiB
Python
# pylint: disable-msg=C0103
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#
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# backported code from 4Suite with slight modifications, started from r1.89 of
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# Ft/Lib/Uri.py, by syt@logilab.fr on 2005-02-09
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#
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# part if not all of this code should probably move to urlparse (or be used
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# to fix some existant functions in this module)
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#
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#
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# Copyright 2004 Fourthought, Inc. (USA).
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# Detailed license and copyright information: http://4suite.org/COPYRIGHT
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# Project home, documentation, distributions: http://4suite.org/
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import os.path
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import sys
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import re
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import urlparse, urllib, urllib2
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def UnsplitUriRef(uriRefSeq):
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"""should replace urlparse.urlunsplit
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Given a sequence as would be produced by SplitUriRef(), assembles and
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returns a URI reference as a string.
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"""
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if not isinstance(uriRefSeq, (tuple, list)):
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raise TypeError("sequence expected, got %s" % type(uriRefSeq))
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(scheme, authority, path, query, fragment) = uriRefSeq
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uri = ''
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if scheme is not None:
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uri += scheme + ':'
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if authority is not None:
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uri += '//' + authority
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uri += path
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if query is not None:
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uri += '?' + query
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if fragment is not None:
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uri += '#' + fragment
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return uri
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SPLIT_URI_REF_PATTERN = re.compile(r"^(?:(?P<scheme>[^:/?#]+):)?(?://(?P<authority>[^/?#]*))?(?P<path>[^?#]*)(?:\?(?P<query>[^#]*))?(?:#(?P<fragment>.*))?$")
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def SplitUriRef(uriref):
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"""should replace urlparse.urlsplit
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Given a valid URI reference as a string, returns a tuple representing the
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generic URI components, as per RFC 2396 appendix B. The tuple's structure
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is (scheme, authority, path, query, fragment).
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All values will be strings (possibly empty) or None if undefined.
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Note that per rfc3986, there is no distinction between a path and
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an "opaque part", as there was in RFC 2396.
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"""
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# the pattern will match every possible string, so it's safe to
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# assume there's a groupdict method to call.
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g = SPLIT_URI_REF_PATTERN.match(uriref).groupdict()
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scheme = g['scheme']
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authority = g['authority']
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path = g['path']
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query = g['query']
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fragment = g['fragment']
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return (scheme, authority, path, query, fragment)
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def Absolutize(uriRef, baseUri):
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"""
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Resolves a URI reference to absolute form, effecting the result of RFC
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3986 section 5. The URI reference is considered to be relative to the
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given base URI.
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It is the caller's responsibility to ensure that the base URI matches
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the absolute-URI syntax rule of RFC 3986, and that its path component
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does not contain '.' or '..' segments if the scheme is hierarchical.
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Unexpected results may occur otherwise.
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This function only conducts a minimal sanity check in order to determine
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if relative resolution is possible: it raises a UriException if the base
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URI does not have a scheme component. While it is true that the base URI
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is irrelevant if the URI reference has a scheme, an exception is raised
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in order to signal that the given string does not even come close to
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meeting the criteria to be usable as a base URI.
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It is the caller's responsibility to make a determination of whether the
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URI reference constitutes a "same-document reference", as defined in RFC
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2396 or RFC 3986. As per the spec, dereferencing a same-document
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reference "should not" involve retrieval of a new representation of the
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referenced resource. Note that the two specs have different definitions
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of same-document reference: RFC 2396 says it is *only* the cases where the
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reference is the empty string, or "#" followed by a fragment; RFC 3986
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requires making a comparison of the base URI to the absolute form of the
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reference (as is returned by the spec), minus its fragment component,
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if any.
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This function is similar to urlparse.urljoin() and urllib.basejoin().
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Those functions, however, are (as of Python 2.3) outdated, buggy, and/or
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designed to produce results acceptable for use with other core Python
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libraries, rather than being earnest implementations of the relevant
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specs. Their problems are most noticeable in their handling of
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same-document references and 'file:' URIs, both being situations that
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come up far too often to consider the functions reliable enough for
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general use.
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"""
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# Reasons to avoid using urllib.basejoin() and urlparse.urljoin():
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# - Both are partial implementations of long-obsolete specs.
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# - Both accept relative URLs as the base, which no spec allows.
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# - urllib.basejoin() mishandles the '' and '..' references.
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# - If the base URL uses a non-hierarchical or relative path,
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# or if the URL scheme is unrecognized, the result is not
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# always as expected (partly due to issues in RFC 1808).
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# - If the authority component of a 'file' URI is empty,
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# the authority component is removed altogether. If it was
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# not present, an empty authority component is in the result.
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# - '.' and '..' segments are not always collapsed as well as they
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# should be (partly due to issues in RFC 1808).
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# - Effective Python 2.4, urllib.basejoin() *is* urlparse.urljoin(),
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# but urlparse.urljoin() is still based on RFC 1808.
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# This procedure is based on the pseudocode in RFC 3986 sec. 5.2.
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#
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# ensure base URI is absolute
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if not baseUri:
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raise ValueError('baseUri is required and must be a non empty string')
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if not IsAbsolute(baseUri):
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raise ValueError('%r is not an absolute URI' % baseUri)
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# shortcut for the simplest same-document reference cases
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if uriRef == '' or uriRef[0] == '#':
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return baseUri.split('#')[0] + uriRef
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# ensure a clean slate
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tScheme = tAuth = tPath = tQuery = None
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# parse the reference into its components
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(rScheme, rAuth, rPath, rQuery, rFrag) = SplitUriRef(uriRef)
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# if the reference is absolute, eliminate '.' and '..' path segments
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# and skip to the end
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if rScheme is not None:
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tScheme = rScheme
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tAuth = rAuth
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tPath = RemoveDotSegments(rPath)
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tQuery = rQuery
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else:
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# the base URI's scheme, and possibly more, will be inherited
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(bScheme, bAuth, bPath, bQuery, bFrag) = SplitUriRef(baseUri)
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# if the reference is a net-path, just eliminate '.' and '..' path
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# segments; no other changes needed.
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if rAuth is not None:
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tAuth = rAuth
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tPath = RemoveDotSegments(rPath)
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tQuery = rQuery
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# if it's not a net-path, we need to inherit pieces of the base URI
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else:
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# use base URI's path if the reference's path is empty
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if not rPath:
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tPath = bPath
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# use the reference's query, if any, or else the base URI's,
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tQuery = rQuery is not None and rQuery or bQuery
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# the reference's path is not empty
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else:
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# just use the reference's path if it's absolute
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if rPath[0] == '/':
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tPath = RemoveDotSegments(rPath)
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# merge the reference's relative path with the base URI's path
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else:
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if bAuth is not None and not bPath:
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tPath = '/' + rPath
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else:
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tPath = bPath[:bPath.rfind('/')+1] + rPath
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tPath = RemoveDotSegments(tPath)
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# use the reference's query
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tQuery = rQuery
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# since the reference isn't a net-path,
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# use the authority from the base URI
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tAuth = bAuth
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# inherit the scheme from the base URI
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tScheme = bScheme
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# always use the reference's fragment (but no need to define another var)
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#tFrag = rFrag
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# now compose the target URI (RFC 3986 sec. 5.3)
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return UnsplitUriRef((tScheme, tAuth, tPath, tQuery, rFrag))
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REG_NAME_HOST_PATTERN = re.compile(r"^(?:(?:[0-9A-Za-z\-_\.!~*'();&=+$,]|(?:%[0-9A-Fa-f]{2}))*)$")
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def MakeUrllibSafe(uriRef):
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"""
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Makes the given RFC 3986-conformant URI reference safe for passing
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to legacy urllib functions. The result may not be a valid URI.
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As of Python 2.3.3, urllib.urlopen() does not fully support
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internationalized domain names, it does not strip fragment components,
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and on Windows, it expects file URIs to use '|' instead of ':' in the
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path component corresponding to the drivespec. It also relies on
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urllib.unquote(), which mishandles unicode arguments. This function
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produces a URI reference that will work around these issues, although
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the IDN workaround is limited to Python 2.3 only. May raise a
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UnicodeEncodeError if the URI reference is Unicode and erroneously
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contains non-ASCII characters.
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"""
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# IDN support requires decoding any percent-encoded octets in the
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# host part (if it's a reg-name) of the authority component, and when
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# doing DNS lookups, applying IDNA encoding to that string first.
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# As of Python 2.3, there is an IDNA codec, and the socket and httplib
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# modules accept Unicode strings and apply IDNA encoding automatically
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# where necessary. However, urllib.urlopen() has not yet been updated
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# to do the same; it raises an exception if you give it a Unicode
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# string, and does no conversion on non-Unicode strings, meaning you
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# have to give it an IDNA string yourself. We will only support it on
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# Python 2.3 and up.
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#
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# see if host is a reg-name, as opposed to IPv4 or IPv6 addr.
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if isinstance(uriRef, unicode):
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try:
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uriRef = uriRef.encode('us-ascii') # parts of urllib are not unicode safe
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except UnicodeError:
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raise ValueError("uri %r must consist of ASCII characters." % uriRef)
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(scheme, auth, path, query, frag) = urlparse.urlsplit(uriRef)
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if auth and auth.find('@') > -1:
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userinfo, hostport = auth.split('@')
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else:
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userinfo = None
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hostport = auth
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if hostport and hostport.find(':') > -1:
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host, port = hostport.split(':')
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else:
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host = hostport
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port = None
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if host and REG_NAME_HOST_PATTERN.match(host):
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# percent-encoded hostnames will always fail DNS lookups
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host = urllib.unquote(host) #PercentDecode(host)
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# IDNA-encode if possible.
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# We shouldn't do this for schemes that don't need DNS lookup,
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# but are there any (that you'd be calling urlopen for)?
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if sys.version_info[0:2] >= (2, 3):
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if isinstance(host, str):
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host = host.decode('utf-8')
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host = host.encode('idna')
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# reassemble the authority with the new hostname
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# (percent-decoded, and possibly IDNA-encoded)
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auth = ''
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if userinfo:
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auth += userinfo + '@'
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auth += host
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if port:
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auth += ':' + port
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# On Windows, ensure that '|', not ':', is used in a drivespec.
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if os.name == 'nt' and scheme == 'file':
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path = path.replace(':', '|', 1)
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# Note that we drop fragment, if any. See RFC 3986 sec. 3.5.
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uri = urlparse.urlunsplit((scheme, auth, path, query, None))
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return uri
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def BaseJoin(base, uriRef):
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"""
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Merges a base URI reference with another URI reference, returning a
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new URI reference.
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It behaves exactly the same as Absolutize(), except the arguments
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are reversed, and it accepts any URI reference (even a relative URI)
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as the base URI. If the base has no scheme component, it is
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evaluated as if it did, and then the scheme component of the result
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is removed from the result, unless the uriRef had a scheme. Thus, if
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neither argument has a scheme component, the result won't have one.
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This function is named BaseJoin because it is very much like
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urllib.basejoin(), but it follows the current rfc3986 algorithms
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for path merging, dot segment elimination, and inheritance of query
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and fragment components.
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WARNING: This function exists for 2 reasons: (1) because of a need
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within the 4Suite repository to perform URI reference absolutization
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using base URIs that are stored (inappropriately) as absolute paths
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in the subjects of statements in the RDF model, and (2) because of
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a similar need to interpret relative repo paths in a 4Suite product
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setup.xml file as being relative to a path that can be set outside
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the document. When these needs go away, this function probably will,
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too, so it is not advisable to use it.
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"""
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if IsAbsolute(base):
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return Absolutize(uriRef, base)
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else:
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dummyscheme = 'basejoin'
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res = Absolutize(uriRef, '%s:%s' % (dummyscheme, base))
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if IsAbsolute(uriRef):
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# scheme will be inherited from uriRef
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return res
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else:
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# no scheme in, no scheme out
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return res[len(dummyscheme)+1:]
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def RemoveDotSegments(path):
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"""
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Supports Absolutize() by implementing the remove_dot_segments function
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described in RFC 3986 sec. 5.2. It collapses most of the '.' and '..'
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segments out of a path without eliminating empty segments. It is intended
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to be used during the path merging process and may not give expected
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results when used independently. Use NormalizePathSegments() or
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NormalizePathSegmentsInUri() if more general normalization is desired.
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semi-private because it is not for general use. I've implemented it
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using two segment stacks, as alluded to in the spec, rather than the
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explicit string-walking algorithm that would be too inefficient. (mbrown)
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"""
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# return empty string if entire path is just "." or ".."
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if path == '.' or path == '..':
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return path[0:0] # preserves string type
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# remove all "./" or "../" segments at the beginning
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while path:
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if path[:2] == './':
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path = path[2:]
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elif path[:3] == '../':
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path = path[3:]
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else:
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break
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# We need to keep track of whether there was a leading slash,
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# because we're going to drop it in order to prevent our list of
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# segments from having an ambiguous empty first item when we call
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# split().
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leading_slash = 0
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if path[:1] == '/':
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path = path[1:]
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leading_slash = 1
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# replace a trailing "/." with just "/"
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if path[-2:] == '/.':
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path = path[:-1]
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# convert the segments into a list and process each segment in
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# order from left to right.
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segments = path.split('/')
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keepers = []
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segments.reverse()
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while segments:
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seg = segments.pop()
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# '..' means drop the previous kept segment, if any.
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# If none, and if the path is relative, then keep the '..'.
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# If the '..' was the last segment, ensure
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# that the result ends with '/'.
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if seg == '..':
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if keepers:
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keepers.pop()
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elif not leading_slash:
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keepers.append(seg)
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if not segments:
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keepers.append('')
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# ignore '.' segments and keep all others, even empty ones
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elif seg != '.':
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keepers.append(seg)
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# reassemble the kept segments
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return leading_slash * '/' + '/'.join(keepers)
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SCHEME_PATTERN = re.compile(r'([a-zA-Z][a-zA-Z0-9+\-.]*):')
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def GetScheme(uriRef):
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"""
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Obtains, with optimum efficiency, just the scheme from a URI reference.
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Returns a string, or if no scheme could be found, returns None.
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"""
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# Using a regex seems to be the best option. Called 50,000 times on
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# different URIs, on a 1.0-GHz PIII with FreeBSD 4.7 and Python
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# 2.2.1, this method completed in 0.95s, and 0.05s if there was no
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# scheme to find. By comparison,
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# urllib.splittype()[0] took 1.5s always;
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# Ft.Lib.Uri.SplitUriRef()[0] took 2.5s always;
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# urlparse.urlparse()[0] took 3.5s always.
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m = SCHEME_PATTERN.match(uriRef)
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if m is None:
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return None
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else:
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return m.group(1)
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def IsAbsolute(identifier):
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"""
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Given a string believed to be a URI or URI reference, tests that it is
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absolute (as per RFC 2396), not relative -- i.e., that it has a scheme.
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"""
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# We do it this way to avoid compiling another massive regex.
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return GetScheme(identifier) is not None
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