/atom/url.py
http://radioappz.googlecode.com/ · Python · 139 lines · 91 code · 15 blank · 33 comment · 36 complexity · 8da1a83bd79ea061a97deba4de4afa3d MD5 · raw file
- #!/usr/bin/python
- #
- # Copyright (C) 2008 Google Inc.
- #
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- __author__ = 'api.jscudder (Jeff Scudder)'
- import urlparse
- import urllib
- DEFAULT_PROTOCOL = 'http'
- DEFAULT_PORT = 80
- def parse_url(url_string):
- """Creates a Url object which corresponds to the URL string.
-
- This method can accept partial URLs, but it will leave missing
- members of the Url unset.
- """
- parts = urlparse.urlparse(url_string)
- url = Url()
- if parts[0]:
- url.protocol = parts[0]
- if parts[1]:
- host_parts = parts[1].split(':')
- if host_parts[0]:
- url.host = host_parts[0]
- if len(host_parts) > 1:
- url.port = host_parts[1]
- if parts[2]:
- url.path = parts[2]
- if parts[4]:
- param_pairs = parts[4].split('&')
- for pair in param_pairs:
- pair_parts = pair.split('=')
- if len(pair_parts) > 1:
- url.params[urllib.unquote_plus(pair_parts[0])] = (
- urllib.unquote_plus(pair_parts[1]))
- elif len(pair_parts) == 1:
- url.params[urllib.unquote_plus(pair_parts[0])] = None
- return url
-
- class Url(object):
- """Represents a URL and implements comparison logic.
-
- URL strings which are not identical can still be equivalent, so this object
- provides a better interface for comparing and manipulating URLs than
- strings. URL parameters are represented as a dictionary of strings, and
- defaults are used for the protocol (http) and port (80) if not provided.
- """
- def __init__(self, protocol=None, host=None, port=None, path=None,
- params=None):
- self.protocol = protocol
- self.host = host
- self.port = port
- self.path = path
- self.params = params or {}
- def to_string(self):
- url_parts = ['', '', '', '', '', '']
- if self.protocol:
- url_parts[0] = self.protocol
- if self.host:
- if self.port:
- url_parts[1] = ':'.join((self.host, str(self.port)))
- else:
- url_parts[1] = self.host
- if self.path:
- url_parts[2] = self.path
- if self.params:
- url_parts[4] = self.get_param_string()
- return urlparse.urlunparse(url_parts)
- def get_param_string(self):
- param_pairs = []
- for key, value in self.params.iteritems():
- param_pairs.append('='.join((urllib.quote_plus(key),
- urllib.quote_plus(str(value)))))
- return '&'.join(param_pairs)
- def get_request_uri(self):
- """Returns the path with the parameters escaped and appended."""
- param_string = self.get_param_string()
- if param_string:
- return '?'.join([self.path, param_string])
- else:
- return self.path
- def __cmp__(self, other):
- if not isinstance(other, Url):
- return cmp(self.to_string(), str(other))
- difference = 0
- # Compare the protocol
- if self.protocol and other.protocol:
- difference = cmp(self.protocol, other.protocol)
- elif self.protocol and not other.protocol:
- difference = cmp(self.protocol, DEFAULT_PROTOCOL)
- elif not self.protocol and other.protocol:
- difference = cmp(DEFAULT_PROTOCOL, other.protocol)
- if difference != 0:
- return difference
- # Compare the host
- difference = cmp(self.host, other.host)
- if difference != 0:
- return difference
- # Compare the port
- if self.port and other.port:
- difference = cmp(self.port, other.port)
- elif self.port and not other.port:
- difference = cmp(self.port, DEFAULT_PORT)
- elif not self.port and other.port:
- difference = cmp(DEFAULT_PORT, other.port)
- if difference != 0:
- return difference
- # Compare the path
- difference = cmp(self.path, other.path)
- if difference != 0:
- return difference
- # Compare the parameters
- return cmp(self.params, other.params)
- def __str__(self):
- return self.to_string()