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"""
Custom pagination tools.
"""
class Page(object):
"""Class to represent a page."""
def __init__(self, paginator, pageid, id_start, id_stop, baseurl=None):
"""Constructor."""
self.paginator = paginator
self.number = pageid
self.id_start = id_start
self.id_stop = id_stop
self.baseurl = baseurl
self._has_previous = None
self._has_next = None
@property
def items_per_page(self):
"""The number of items in a page. (shortcut)"""
return self.paginator.elems_per_page
@property
def items(self):
"""The number of items in this page."""
return self.id_stop - self.id_start
@property
def has_previous(self):
"""Tell if a previous page is available or not."""
if self._has_previous is None:
self._has_previous = True if self.number > 1 else False
return self._has_previous
@property
def previous_page_number(self):
"""Return the index of the previous page."""
if not self.has_previous:
return False
return self.number - 1
@property
def has_next(self):
"""Tell if a next page is available or not."""
if self._has_next is None:
self._has_next = (
True if self.id_stop < self.paginator.total else False
)
return self._has_next
@property
def next_page_number(self):
"""Return the index of the next page."""
if not self.has_next:
return False
return self.number + 1
@property
def last_page(self):
"""Retrieve the id of the last page."""
lid = self.paginator.total / self.items_per_page
if not lid:
return 1
if self.paginator.total % self.items_per_page:
lid += 1
return lid
class Paginator(object):
"""Pagination class."""
def __init__(self, total, elems_per_page):
self.total = total
self.elems_per_page = elems_per_page
self.num_pages = total / elems_per_page
if total % elems_per_page:
self.num_pages += 1
def _indexes(self, page):
"""Compute start and stop indexes."""
id_start = self.elems_per_page * page + 1
id_stop = id_start + self.elems_per_page - 1
return (id_start, id_stop)
def getpage(self, page_id):
"""Retrieve a specific page."""
if page_id < 1:
return None
id_start, id_stop = self._indexes(page_id - 1)
if id_start <= self.total:
if id_stop >= self.total:
id_stop = self.total
else:
return None
return Page(self, page_id, id_start, id_stop)