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__init__.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2013 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
invenio.ext.menualchemy
----
This extension allows creation of menus organised in a tree structure.
Those menus can be then displayed using templates.
"""
from flask import url_for, current_app
from werkzeug import LocalProxy
CONDITION_TRUE = (lambda: True)
CONDITION_FALSE = (lambda: False)
class MenuAlchemy(object):
"""Extension object for invenio.ext.menualchemy"""
def __init__(self, app=None):
self.app = app
if app is not None:
self.init_app(app)
def init_app(self, app):
app.extensions['menualchemy'] = MenuEntryMixin('', None)
app.context_processor(lambda: dict(
current_menu=current_menu))
config = {}
@staticmethod
def root():
"""
:return: Root entry of current application's menu.
"""
return current_app.extensions['menualchemy']
@staticmethod
def register_menu(blueprint, path, text, order=0,
endpoint_arguments_constructor=None,
dynamic_list_constructor=None,
active_when=CONDITION_FALSE,
visible_when=CONDITION_TRUE):
"""Decorate endpoints that should be displayed in a menu.
Example::
@register_menu(blueprint, '.', _('Your Tags'))
def index():
pass
:param blueprint: Blueprint which owns the function.
:param path: Path to this item in menu hierarchy,
for example 'main.category.item'. Path can be an object
with custom __str__ method: it will be converted on first request,
therefore you can use current_app inside this __str__ method.
:param text: Text displayed as link.
:param order: Index of item among other items in the same menu.
:param endpoint_arguments_constructor: Function returning dict of
arguments passed to url_for when creating the link.
:param active_when: Function returning True when the item
should be displayed as active.
:param visible_when: Function returning True when this item
should be displayed.
:param dynamic_list_constructor: Function returning a list of
entries to be displayed by this item. Every object should
have 'text' and 'url' properties/dict elements. This property
will not be directly affect the menu system, but allows
other systems to use it while rendering.
"""
#Decorator function
def menu_decorator(f):
endpoint = blueprint.name + '.' + f.__name__
@blueprint.before_app_first_request
def _register_menu_item():
# str(path) allows path to be a string-convertible object
# that may be useful for delayed evaluation of path
item = current_menu.submenu(str(path))
item.register(
endpoint,
text,
order,
endpoint_arguments_constructor=endpoint_arguments_constructor,
dynamic_list_constructor=dynamic_list_constructor,
active_when=active_when,
visible_when=visible_when)
return f
return menu_decorator
class MenuEntryMixin(object):
"""Represents a entry node in the menu tree.
Provides information for displaying links (text, url, visible, active).
Navigate the hierarchy using :meth:`children` and :meth:`submenu`.
"""
def __init__(self, name, parent):
self.name = name
self.parent = parent
self._child_entries = dict()
self._endpoint = None
self._text = None
self._order = 0
self._endpoint_arguments_constructor = None
self._dynamic_list_constructor = None
self._active_when = CONDITION_FALSE
self._visible_when = CONDITION_TRUE
def register(self, endpoint, text, order=0,
endpoint_arguments_constructor=None,
dynamic_list_constructor=None,
active_when=CONDITION_FALSE,
visible_when=CONDITION_TRUE):
"""Assigns endpoint and display values."""
self._endpoint = endpoint
self._text = text
self._order = order
self._endpoint_arguments_constructor = endpoint_arguments_constructor
self._dynamic_list_constructor = dynamic_list_constructor
self._active_when = active_when or CONDITION_FALSE
self._visible_when = visible_when or CONDITION_TRUE
def submenu(self, path, auto_create=True):
"""Returns submenu placed at the given path in the hierarchy.
If it does not exist, a new one is created.
Returns None if path string is invalid.
:param path: Path to submenu as a string 'qua.bua.cua'
:param auto_create: If True, missing entries will be created
to satisfy the given path.
:return: Submenu placed at the given path in the hierarchy.
"""
if not path:
return self
(path_head, dot, path_tail) = path.partition('.')
# Create the entry if it does not exist
if path_head not in self._child_entries:
if auto_create:
# The entry was not found so create a new one
self._child_entries[path_head] = \
MenuEntryMixin(path_head, self)
else:
# The entry was not found, but we are forbidden to create
return None
next_entry = self._child_entries[path_head]
if path_tail:
return next_entry.submenu(path_tail, auto_create)
else:
# that was the last part of the path
return next_entry
def list_path(self, from_path, to_path):
"""
Lists all items on path between two specified entries,
if one of them is an ancestor of the other.
:param from_path: The ancestor entry.
:param to_path: The child entry.
:return: List of entries between those items or None if
they are on different branches.
"""
ancestor_entry = self.submenu(from_path)
child_entry = self.submenu(to_path)
if not (ancestor_entry and child_entry):
# Incorrect paths
return None
branch_list = [child_entry]
while (child_entry.parent is not None) \
and (child_entry != ancestor_entry):
child_entry = child_entry.parent
branch_list.append(child_entry)
# This means the search reached root, but the ancestor
# was not encountered. Therefore, entries are on different branches.
if branch_list[-1] != ancestor_entry:
return None
else:
branch_list.reverse()
return branch_list
def hide(self):
"""Makes the entry always hidden."""
self._visible_when = CONDITION_FALSE
@property
def dynamic_list(self):
""" Extends this entry into a list if the
dynamic list constructor was specified"""
if self._dynamic_list_constructor:
return self._dynamic_list_constructor()
else:
return [self]
@property
def order(self):
return self._order
@property
def children(self):
return sorted(self._child_entries.values(),
key=lambda entry: getattr(entry, 'order', 0))
@property
def text(self):
return self._text or 'Menu item not initialised'
@property
def url(self):
if not self._endpoint:
return '#'
if self._endpoint_arguments_constructor:
return url_for(self._endpoint,
**self._endpoint_arguments_constructor())
return url_for(self._endpoint)
@property
def active(self):
return self._active_when()
@property
def visible(self):
return self._text is not None and self._visible_when()
## Global object that is proxy to the current application menu.
current_menu = LocalProxy(MenuAlchemy.root)
## Decorator for menu item registration.
register_menu = MenuAlchemy.register_menu
def setup_app(app):
"""Creates a menu instance attached to the application."""
MenuAlchemy(app)
return app
__all__ = ['current_menu', 'register_menu', 'MenuAlchemy', 'setup_app']

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