169 lines
5.3 KiB
Python
169 lines
5.3 KiB
Python
"""Logic for traversing directory objects and generating output.
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"""
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import quixote
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from quixote.errors import TraversalError
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class DirectoryClass(type):
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"""A meta-class for Directory. Its purpose is to process methods
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that are exported using the export() and subdir() decorators.
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"""
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def __new__(meta, classname, bases, classdict):
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cls = type.__new__(meta, classname, bases, classdict)
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exports = []
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for k, v in classdict.items():
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if isinstance(v, property):
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# might be a property from subdir(), get the original method
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v = v.fget
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if hasattr(v, '_q_name'):
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if v._q_name == k:
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exports.append(k)
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else:
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exports.append((v._q_name, k))
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if exports:
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# Only monkey with _q_exports if names are exported using the
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# decorators.
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exports += getattr(cls, '_q_exports', [])
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cls._q_exports = exports
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return cls
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class Directory(object, metaclass=DirectoryClass):
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"""
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Instance attributes: none
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"""
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# A list containing strings or 2-tuples of strings that map external
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# names to internal names. Note that the empty string will be
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# implicitly mapped to '_q_index'.
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_q_exports = []
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def _q_translate(self, component):
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"""(component : string) -> string | None
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Translate a path component into a Python identifier. Returning
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None signifies that the component does not exist.
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"""
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if component in self._q_exports:
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if component == '':
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return '_q_index' # implicit mapping
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else:
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return component
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else:
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# check for an explicit external to internal mapping
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for value in self._q_exports:
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if isinstance(value, tuple):
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if value[0] == component:
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return value[1]
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else:
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return None
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def _q_lookup(self, component):
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"""(component : string) -> object
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Lookup a path component and return the corresponding object (usually
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a Directory, a method or a string). Returning None signals that the
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component does not exist.
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"""
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return None
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def _q_traverse(self, path):
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"""(path: [string]) -> object
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Traverse a path and return the result.
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"""
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assert len(path) > 0
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component = path[0]
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path = path[1:]
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name = self._q_translate(component)
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if name is not None:
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obj = getattr(self, name)
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else:
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obj = self._q_lookup(component)
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if obj is None:
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raise TraversalError(private_msg=('directory %r has no component '
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'%r' % (self, component)))
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if path:
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if hasattr(obj, '_q_traverse'):
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return obj._q_traverse(path)
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else:
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raise TraversalError
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elif hasattr(obj, '__call__'):
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return obj()
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else:
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return obj
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def __call__(self):
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if "" in self._q_exports and not quixote.get_request().form:
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# Fix missing trailing slash.
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path = quixote.get_path()
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print("Adding slash to: %r " % path)
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return quixote.redirect(path + "/", permanent=True)
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else:
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raise TraversalError(private_msg=('directory %r is not '
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'callable' % self))
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class AccessControlled(object):
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"""
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A mix-in class that calls the _q_access() method before traversing
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into the directory.
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"""
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def _q_access(self):
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pass
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def _q_traverse(self, path):
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self._q_access()
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return super(AccessControlled, self)._q_traverse(path)
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class Resolving(object):
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"""
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A mix-in class that provides the _q_resolve() method. _q_resolve()
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is called if a component name appears in the _q_exports list but is
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not an instance attribute. _q_resolve is expected to return the
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component object.
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"""
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def _q_resolve(self, name):
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return None
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def _q_translate(self, component):
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name = super(Resolving, self)._q_translate(component)
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if name is not None and not hasattr(self, name):
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obj = self._q_resolve(name)
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setattr(self, name, obj)
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return name
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def export(func=None, name=None):
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"""Export a function that generates a page. If 'name' is not
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provided then the name of the page defaults to the name of the
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function (method).
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"""
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def do_export(func):
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if name is None:
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func._q_name = func.__name__
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else:
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func._q_name = name
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return func
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if func is None:
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return do_export
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else:
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return do_export(func)
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def subdir(func=None, name=None):
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"""Export a function that returns a sub-directory object. If 'name'
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is not provided then the name of the directory defaults to the name
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of the function (method).
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"""
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def do_export(func):
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if name is None:
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func._q_name = func.__name__
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else:
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func._q_name = name
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return property(func)
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if func is None:
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return do_export
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else:
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return do_export(func)
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