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# -*- coding: utf-8 -*-
"""
plnt.utils
~~~~~~~~~~
The planet utilities.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import re
from os import path
from jinja2 import Environment
from jinja2 import FileSystemLoader
from werkzeug._compat import unichr
from werkzeug.local import Local
from werkzeug.local import LocalManager
from werkzeug.routing import Map
from werkzeug.routing import Rule
from werkzeug.utils import cached_property
from werkzeug.wrappers import Response
# context locals. these two objects are use by the application to
# bind objects to the current context. A context is defined as the
# current thread and the current greenlet if there is greenlet support.
# the `get_request` and `get_application` functions look up the request
# and application objects from this local manager.
local = Local()
local_manager = LocalManager([local])
# proxy objects
request = local("request")
application = local("application")
url_adapter = local("url_adapter")
# let's use jinja for templates this time
template_path = path.join(path.dirname(__file__), "templates")
jinja_env = Environment(loader=FileSystemLoader(template_path))
# the collected url patterns
url_map = Map([Rule("/shared/<path:file>", endpoint="shared")])
endpoints = {}
_par_re = re.compile(r"\n{2,}")
_entity_re = re.compile(r"&([^;]+);")
_striptags_re = re.compile(r"(<!--.*-->|<[^>]*>)")
try:
from html.entities import name2codepoint
except ImportError:
from htmlentitydefs import name2codepoint
html_entities = name2codepoint.copy()
html_entities["apos"] = 39
del name2codepoint
def expose(url_rule, endpoint=None, **kwargs):
"""Expose this function to the web layer."""
def decorate(f):
e = endpoint or f.__name__
endpoints[e] = f
url_map.add(Rule(url_rule, endpoint=e, **kwargs))
return f
return decorate
def render_template(template_name, **context):
"""Render a template into a response."""
tmpl = jinja_env.get_template(template_name)
context["url_for"] = url_for
return Response(tmpl.render(context), mimetype="text/html")
def nl2p(s):
"""Add paragraphs to a text."""
return u"\n".join(u"<p>%s</p>" % p for p in _par_re.split(s))
def url_for(endpoint, **kw):
"""Simple function for URL generation."""
return url_adapter.build(endpoint, kw)
def strip_tags(s):
"""Resolve HTML entities and remove tags from a string."""
def handle_match(m):
name = m.group(1)
if name in html_entities:
return unichr(html_entities[name])
if name[:2] in ("#x", "#X"):
try:
return unichr(int(name[2:], 16))
except ValueError:
return u""
elif name.startswith("#"):
try:
return unichr(int(name[1:]))
except ValueError:
return u""
return u""
return _entity_re.sub(handle_match, _striptags_re.sub("", s))
class Pagination(object):
"""
Paginate a SQLAlchemy query object.
"""
def __init__(self, query, per_page, page, endpoint):
self.query = query
self.per_page = per_page
self.page = page
self.endpoint = endpoint
@cached_property
def entries(self):
return (
self.query.offset((self.page - 1) * self.per_page)
.limit(self.per_page)
.all()
)
@cached_property
def count(self):
return self.query.count()
@property
def has_previous(self):
"""Return True if there are pages before the current one."""
return self.page > 1
@property
def has_next(self):
"""Return True if there are pages after the current one."""
return self.page < self.pages
@property
def previous(self):
"""Return the URL for the previous page."""
return url_for(self.endpoint, page=self.page - 1)
@property
def next(self):
"""Return the URL for the next page."""
return url_for(self.endpoint, page=self.page + 1)
@property
def pages(self):
"""Return the number of pages."""
return max(0, self.count - 1) // self.per_page + 1
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