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author | cmlenz |
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date | Mon, 03 Jul 2006 18:53:27 +0000 |
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# -*- coding: utf-8 -*- # # Copyright (C) 2003-2005 Edgewall Software # Copyright (C) 2003-2004 Jonas Borgström <jonas@edgewall.com> # Copyright (C) 2005 Christopher Lenz <cmlenz@gmx.de> # All rights reserved. # # This software is licensed as described in the file COPYING, which # you should have received as part of this distribution. The terms # are also available at http://trac.edgewall.com/license.html. # # This software consists of voluntary contributions made by many # individuals. For the exact contribution history, see the revision # history and logs, available at http://projects.edgewall.com/trac/. # # Author: Jonas Borgström <jonas@edgewall.com> # Christopher Lenz <cmlenz@gmx.de> from urllib import quote, urlencode from trac.util.text import unicode_quote, unicode_urlencode class Href(object): """ Implements a callable that constructs URLs with the given base. The function can be called with any number of positional and keyword arguments which than are used to assemble the URL. Positional arguments are appended as individual segments to the path of the URL: >>> href = Href('/trac') >>> href('ticket', 540) '/trac/ticket/540' >>> href('ticket', 540, 'attachment', 'bugfix.patch') '/trac/ticket/540/attachment/bugfix.patch' >>> href('ticket', '540/attachment/bugfix.patch') '/trac/ticket/540/attachment/bugfix.patch' If a positional parameter evaluates to None, it will be skipped: >>> href('ticket', 540, 'attachment', None) '/trac/ticket/540/attachment' The first path segment can also be specified by calling an attribute of the instance, as follows: >>> href.ticket(540) '/trac/ticket/540' >>> href.changeset(42, format='diff') '/trac/changeset/42?format=diff' Simply calling the Href object with no arguments will return the base URL: >>> href() '/trac' Keyword arguments are added to the query string, unless the value is None: >>> href = Href('/trac') >>> href('timeline', format='rss') '/trac/timeline?format=rss' >>> href('timeline', format=None) '/trac/timeline' >>> href('search', q='foo bar') '/trac/search?q=foo+bar' Multiple values for one parameter are specified using a sequence (a list or tuple) for the parameter: >>> href('timeline', show=['ticket', 'wiki', 'changeset']) '/trac/timeline?show=ticket&show=wiki&show=changeset' Alternatively, query string parameters can be added by passing a dict or list as last positional argument: >>> href('timeline', {'from': '02/24/05', 'daysback': 30}) '/trac/timeline?daysback=30&from=02%2F24%2F05' If the order of query string parameters should be preserved, you may also pass a sequence of (name, value) tuples as last positional argument: >>> href('query', (('group', 'component'), ('groupdesc', 1))) '/trac/query?group=component&groupdesc=1' >>> params = [] >>> params.append(('group', 'component')) >>> params.append(('groupdesc', 1)) >>> href('query', params) '/trac/query?group=component&groupdesc=1' By specifying an absolute base, the function returned will also generate absolute URLs: >>> href = Href('http://projects.edgewall.com/trac') >>> href('ticket', 540) 'http://projects.edgewall.com/trac/ticket/540' >>> href = Href('https://projects.edgewall.com/trac') >>> href('ticket', 540) 'https://projects.edgewall.com/trac/ticket/540' In common usage, it may improve readability to use the function-calling ability for the first component of the URL as mentioned earlier: >>> href = Href('/trac') >>> href.ticket(540) '/trac/ticket/540' >>> href.browser('/trunk/README.txt', format='txt') '/trac/browser/trunk/README.txt?format=txt' """ def __init__(self, base): self.base = base self._derived = {} def __call__(self, *args, **kw): href = self.base if href and href[-1] == '/': href = href[:-1] params = [] def add_param(name, value): if type(value) in (list, tuple): for i in [i for i in value if i != None]: params.append((name, i)) elif v != None: params.append((name, value)) if args: lastp = args[-1] if lastp and type(lastp) is dict: for k,v in lastp.items(): add_param(k, v) args = args[:-1] elif lastp and type(lastp) in (list, tuple): for k,v in lastp: add_param(k, v) args = args[:-1] # build the path path = '/'.join([unicode_quote(unicode(arg).strip('/')) for arg in args if arg != None]) if path: href += '/' + path # assemble the query string for k,v in kw.items(): add_param(k, v) if params: href += '?' + unicode_urlencode(params) return href def __getattr__(self, name): if not self._derived.has_key(name): self._derived[name] = lambda *args, **kw: self(name, *args, **kw) return self._derived[name] if __name__ == '__main__': import doctest, sys doctest.testmod(sys.modules[__name__])