135 lines
4.7 KiB
Python
135 lines
4.7 KiB
Python
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"""When it comes to combining multiple controller or view functions
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(however you want to call them) you need a dispatcher. A simple way
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would be applying regular expression tests on the ``PATH_INFO`` and
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calling registered callback functions that return the value then.
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This module implements a much more powerful system than simple regular
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expression matching because it can also convert values in the URLs and
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build URLs.
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Here a simple example that creates a URL map for an application with
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two subdomains (www and kb) and some URL rules:
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.. code-block:: python
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m = Map([
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# Static URLs
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Rule('/', endpoint='static/index'),
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Rule('/about', endpoint='static/about'),
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Rule('/help', endpoint='static/help'),
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# Knowledge Base
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Subdomain('kb', [
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Rule('/', endpoint='kb/index'),
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Rule('/browse/', endpoint='kb/browse'),
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Rule('/browse/<int:id>/', endpoint='kb/browse'),
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Rule('/browse/<int:id>/<int:page>', endpoint='kb/browse')
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])
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], default_subdomain='www')
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If the application doesn't use subdomains it's perfectly fine to not set
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the default subdomain and not use the `Subdomain` rule factory. The
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endpoint in the rules can be anything, for example import paths or
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unique identifiers. The WSGI application can use those endpoints to get the
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handler for that URL. It doesn't have to be a string at all but it's
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recommended.
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Now it's possible to create a URL adapter for one of the subdomains and
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build URLs:
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.. code-block:: python
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c = m.bind('example.com')
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c.build("kb/browse", dict(id=42))
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'http://kb.example.com/browse/42/'
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c.build("kb/browse", dict())
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'http://kb.example.com/browse/'
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c.build("kb/browse", dict(id=42, page=3))
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'http://kb.example.com/browse/42/3'
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c.build("static/about")
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'/about'
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c.build("static/index", force_external=True)
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'http://www.example.com/'
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c = m.bind('example.com', subdomain='kb')
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c.build("static/about")
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'http://www.example.com/about'
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The first argument to bind is the server name *without* the subdomain.
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Per default it will assume that the script is mounted on the root, but
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often that's not the case so you can provide the real mount point as
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second argument:
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.. code-block:: python
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c = m.bind('example.com', '/applications/example')
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The third argument can be the subdomain, if not given the default
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subdomain is used. For more details about binding have a look at the
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documentation of the `MapAdapter`.
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And here is how you can match URLs:
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.. code-block:: python
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c = m.bind('example.com')
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c.match("/")
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('static/index', {})
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c.match("/about")
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('static/about', {})
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c = m.bind('example.com', '/', 'kb')
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c.match("/")
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('kb/index', {})
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c.match("/browse/42/23")
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('kb/browse', {'id': 42, 'page': 23})
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If matching fails you get a ``NotFound`` exception, if the rule thinks
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it's a good idea to redirect (for example because the URL was defined
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to have a slash at the end but the request was missing that slash) it
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will raise a ``RequestRedirect`` exception. Both are subclasses of
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``HTTPException`` so you can use those errors as responses in the
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application.
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If matching succeeded but the URL rule was incompatible to the given
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method (for example there were only rules for ``GET`` and ``HEAD`` but
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routing tried to match a ``POST`` request) a ``MethodNotAllowed``
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exception is raised.
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"""
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from .converters import AnyConverter as AnyConverter
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from .converters import BaseConverter as BaseConverter
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from .converters import FloatConverter as FloatConverter
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from .converters import IntegerConverter as IntegerConverter
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from .converters import PathConverter as PathConverter
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from .converters import UnicodeConverter as UnicodeConverter
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from .converters import UUIDConverter as UUIDConverter
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from .converters import ValidationError as ValidationError
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from .exceptions import BuildError as BuildError
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from .exceptions import NoMatch as NoMatch
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from .exceptions import RequestAliasRedirect as RequestAliasRedirect
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from .exceptions import RequestPath as RequestPath
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from .exceptions import RequestRedirect as RequestRedirect
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from .exceptions import RoutingException as RoutingException
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from .exceptions import WebsocketMismatch as WebsocketMismatch
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from .map import Map as Map
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from .map import MapAdapter as MapAdapter
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from .matcher import StateMachineMatcher as StateMachineMatcher
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from .rules import EndpointPrefix as EndpointPrefix
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from .rules import parse_converter_args as parse_converter_args
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from .rules import Rule as Rule
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from .rules import RuleFactory as RuleFactory
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from .rules import RuleTemplate as RuleTemplate
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from .rules import RuleTemplateFactory as RuleTemplateFactory
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from .rules import Subdomain as Subdomain
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from .rules import Submount as Submount
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