763 lines
21 KiB
Python
763 lines
21 KiB
Python
#!/usr/bin/env python
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import sys
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import os.path
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from datetime import datetime
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import re
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import json
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import csv
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from lxml import etree
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from dateutil import tz
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import dateutil.parser
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from . import crawler
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try:
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from wheezy.template.engine import Engine
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from wheezy.template.loader import DictLoader
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from wheezy.template.ext.core import CoreExtension
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except ImportError:
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Engine = DictLoader = CoreExtension = None
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json.encoder.c_make_encoder = None
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try:
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from collections import OrderedDict
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except ImportError:
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# python < 2.7
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from ordereddict import OrderedDict
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try:
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from StringIO import StringIO
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from urllib2 import urlopen
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except ImportError:
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# python > 3
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from io import StringIO
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from urllib.request import urlopen
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try:
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basestring
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except NameError:
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basestring = unicode = str
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Element = etree.Element
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NSMAP = {'atom': 'http://www.w3.org/2005/Atom',
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'atom03': 'http://purl.org/atom/ns#',
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'media': 'http://search.yahoo.com/mrss/',
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'rdf': 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
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'slash': 'http://purl.org/rss/1.0/modules/slash/',
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'dc': 'http://purl.org/dc/elements/1.1/',
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'content': 'http://purl.org/rss/1.0/modules/content/',
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'rssfake': 'http://purl.org/rss/1.0/'}
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def load(url):
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d = urlopen(url).read()
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return parse(d)
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def tag_NS(tag, nsmap=NSMAP):
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match = re.search(r'^\{([^\}]+)\}(.*)$', tag)
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if match:
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match = match.groups()
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for (key, url) in nsmap.items():
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if url == match[0]:
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return "%s:%s" % (key, match[1].lower())
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else:
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match = re.search(r'^([^:]+):([^:]+)$', tag)
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if match:
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match = match.groups()
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if match[0] in nsmap:
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return "{%s}%s" % (nsmap[match[0]], match[1].lower())
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return tag
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def inner_html(xml):
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return (xml.text or '') + ''.join([etree.tostring(child) for child in xml.iterchildren()])
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def clean_node(xml):
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[xml.remove(child) for child in xml.iterchildren()]
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class FeedException(Exception):
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pass
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def parse(data):
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# parse
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parser = etree.XMLParser(recover=True)
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doc = etree.fromstring(data, parser)
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# rss
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match = doc.xpath("//atom03:feed|//atom:feed|//channel|//rdf:rdf|//rdf:RDF", namespaces=NSMAP)
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if len(match):
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m_table = {'rdf:rdf': FeedParserRSS, 'channel': FeedParserRSS,
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'atom03:feed': FeedParserAtom, 'atom:feed': FeedParserAtom}
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match = match[0]
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tag = tag_NS(match.tag)
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if tag in m_table:
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return m_table[tag](doc, tag)
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raise FeedException('unknown feed type')
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class FeedBase(object):
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"""
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Base for xml-related classes, which provides simple wrappers around xpath
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selection and item creation
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"""
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def __getitem__(self, item):
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return getattr(self, item)
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def __setitem__(self, item, value):
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setattr(self, item, value)
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def __delitem__(self, item):
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delattr(self, item)
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def __iter__(self):
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for element in self.dic:
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value = self[element]
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if isinstance(value, FeedList):
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value = [OrderedDict(x) for x in value]
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elif isinstance(value, datetime):
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value = value.isoformat()
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yield element, value
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def xpath(self, path):
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""" Test xpath rule on xml tree """
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return self.root.xpath(path, namespaces=NSMAP)
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def xget(self, path):
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""" Returns the 1st xpath match """
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match = self.xpath(path)
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if len(match):
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return match[0]
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else:
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return None
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def xval(self, path):
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""" Returns the .text of the 1st match """
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match = self.xget(path)
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if match is not None:
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return match.text or ""
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else:
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return ""
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def xget_create(self, table):
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""" Returns an element, and creates it when not present """
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value = table[self.tag]
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if not isinstance(value, tuple):
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value = (value, value)
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new, xpath = value
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match = self.xget(xpath)
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if match is not None:
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return match
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else:
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element = etree.Element(tag_NS(new))
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self.root.append(element)
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return element
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def xdel(self, path):
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match = self.xget(path)
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if match is not None:
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return match.getparent().remove(match)
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def tostring(self, **k):
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""" Returns string using lxml. Arguments passed to tostring """
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return etree.tostring(self.xml, pretty_print=True, **k)
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class FeedDescriptor(object):
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"""
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Descriptor which gives off elements based on "self.getName" and
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"self.setName" as getter/setters. Looks far better, and avoids duplicates
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"""
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def __init__(self, name):
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self.name = name
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def __get__(self, instance, owner):
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getter = getattr(instance, 'get_%s' % self.name)
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return getter()
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def __set__(self, instance, value):
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setter = getattr(instance, 'set_%s' % self.name)
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return setter(value)
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def __delete__(self, instance):
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deleter = getattr(instance, 'del_%s' % self.name)
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return deleter()
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class FeedTime(FeedDescriptor):
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def __get__(self, instance, owner):
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getter = getattr(instance, 'get_%s' % self.name)
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raw = getter()
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try:
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time = parse_time(raw)
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return time
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except ValueError:
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return None
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def __set__(self, instance, value):
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try:
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time = parse_time(value)
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raw = time.strftime(instance.timeFormat)
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setter = getattr(instance, 'set_%s' % self.name)
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return setter(raw)
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except ValueError:
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pass
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class FeedBool(FeedDescriptor):
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def __get__(self, instance, owner):
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getter = getattr(instance, 'get_%s' % self.name)
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raw = getter()
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return (raw or '').lower() != 'false'
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def __set__(self, instance, value):
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raw = 'true' if value else 'false'
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setter = getattr(instance, 'set_%s' % self.name)
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return setter(raw)
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def parse_time(value):
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if isinstance(value, basestring):
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if re.match(r'^[0-9]+$', value):
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return datetime.fromtimestamp(int(value), tz.tzutc())
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else:
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return dateutil.parser.parse(value, tzinfos=tz.tzutc)
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elif isinstance(value, int):
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return datetime.fromtimestamp(value, tz.tzutc())
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elif isinstance(value, datetime):
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return value
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else:
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return False
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class FeedList(object):
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"""
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Class to map a list of xml elements against a list of matching objects,
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while avoiding to recreate the same matching object over and over again. So
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as to avoid extra confusion, list's elements are called "children" here, so
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as not to use "items", which is already in use in RSS/Atom related code.
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Comes with its very own descriptor.
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"""
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def __init__(self, parent, getter, tag, child_class):
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self.parent = parent
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self.getter = getter
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self.childClass = child_class
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self.tag = tag
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self._children = {} # id(xml) => FeedItem
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def get_children(self):
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children = self.getter()
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out = []
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for child in children:
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if id(child) in self._children:
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out.append(self._children[id(child)])
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else:
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new = self.childClass(child, self.tag)
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self._children[id(child)] = new
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out.append(new)
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return out
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def append(self, cousin=None):
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new = self.childClass(tag=self.tag)
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self.parent.root.append(new.xml)
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self._children[id(new.xml)] = new
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if cousin is None:
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return new
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for key in self.childClass.__dict__:
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if key.startswith('set_'):
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attr = key[4:]
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if hasattr(cousin, attr):
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setattr(new, attr, getattr(cousin, attr))
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elif attr in cousin:
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setattr(new, attr, cousin[attr])
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return new
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def __getitem__(self, key):
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return self.get_children()[key]
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def __delitem__(self, key):
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child = self.getter()[key]
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if id(child) in self._children:
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self._children[id(child)].remove()
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del self._children[id(child)]
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else:
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child.getparent().remove(child)
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def __len__(self):
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return len(self.getter())
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class FeedListDescriptor(object):
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"""
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Descriptor for FeedList
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"""
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def __init__(self, name):
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self.name = name
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self.items = {} # id(instance) => FeedList
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def __get__(self, instance, owner=None):
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key = id(instance)
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if key in self.items:
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return self.items[key]
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else:
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getter = getattr(instance, 'get_%s' % self.name)
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class_name = globals()[getattr(instance, '%sClass' % self.name)]
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self.items[key] = FeedList(instance, getter, instance.tag, class_name)
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return self.items[key]
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def __set__(self, instance, value):
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feedlist = self.__get__(instance)
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[x.remove() for x in list(feedlist)]
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[feedlist.append(x) for x in value]
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class FeedParser(FeedBase):
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itemsClass = 'FeedItem'
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mimetype = 'application/xml'
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base = b'<?xml?>'
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dic = ('title', 'desc', 'items')
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def __init__(self, xml=None, tag='atom:feed'):
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if xml is None:
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xml = etree.fromstring(self.base[tag])
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self.xml = xml
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self.root = self.xml.xpath("//atom03:feed|//atom:feed|//channel|//rssfake:channel", namespaces=NSMAP)[0]
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self.tag = tag
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def get_title(self):
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return ""
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def set_title(self, value):
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pass
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def del_title(self):
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self.title = ""
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def get_desc(self):
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pass
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def set_desc(self, value):
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pass
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def del_desc(self):
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self.desc = ""
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def get_items(self):
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return []
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title = FeedDescriptor('title')
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description = desc = FeedDescriptor('desc')
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items = FeedListDescriptor('items')
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def tostring(self, **k):
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return etree.tostring(self.xml.getroottree(), **k)
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def tojson(self, indent=None):
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return json.dumps(OrderedDict(self), indent=indent)
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def tocsv(self):
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out = StringIO()
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c = csv.writer(out, dialect=csv.excel)
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for item in self.items:
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if sys.version_info[0] >= 3:
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row = [x[1] for x in item]
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else:
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row = [x[1].encode('utf-8') if isinstance(x[1], unicode) else x[1] for x in item]
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c.writerow(row)
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out.seek(0)
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return out.read()
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def tohtml(self):
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if DictLoader is None:
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raise ImportError('dep wheezy.template needed')
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path = os.path.join(os.path.dirname(__file__), 'reader.html.template')
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loader = DictLoader({'reader': open(path).read()})
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engine = Engine(loader=loader, extensions=[CoreExtension()])
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template = engine.get_template('reader')
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return template.render({'feed': self}).encode('utf-8')
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class FeedParserRSS(FeedParser):
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"""
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RSS Parser
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"""
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itemsClass = 'FeedItemRSS'
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mimetype = 'application/rss+xml'
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base = {
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'rdf:rdf': b'<?xml version="1.0" encoding="utf-8"?><rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://purl.org/rss/1.0/"><channel rdf:about="http://example.org/rss.rdf"></channel></rdf:RDF>',
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'channel': b'<?xml version="1.0" encoding="utf-8"?><rss version="2.0"><channel></channel></rss>'}
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def get_title(self):
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return self.xval('rssfake:title|title')
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def set_title(self, value):
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if not value:
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return self.xdel('rssfake:title|title')
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table = {'rdf:rdf': 'rssfake:title',
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'channel': 'title'}
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element = self.xget_create(table)
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element.text = value
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def get_desc(self):
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return self.xval('rssfake:description|description')
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def set_desc(self, value):
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if not value:
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return self.xdel('rssfake:description|description')
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table = {'rdf:rdf': 'rssfake:description',
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'channel': 'description'}
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element = self.xget_create(table)
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element.text = value
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def get_items(self):
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return self.xpath('rssfake:item|item')
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class FeedParserAtom(FeedParser):
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"""
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Atom Parser
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"""
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itemsClass = 'FeedItemAtom'
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mimetype = 'application/atom+xml'
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base = {'atom:feed': b'<?xml version="1.0" encoding="utf-8"?><feed xmlns="http://www.w3.org/2005/Atom"></feed>',
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'atom03:feed': b'<?xml version="1.0" encoding="utf-8"?><feed version="0.3" xmlns="http://purl.org/atom/ns#"></feed>'}
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def get_title(self):
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return self.xval('atom:title|atom03:title')
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def set_title(self, value):
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if not value:
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return self.xval('atom:title|atom03:title')
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table = {'atom:feed': 'atom:title',
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'atom03:feed': 'atom03:title'}
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element = self.xget_create(table)
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element.text = value
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def get_desc(self):
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return self.xval('atom:subtitle|atom03:subtitle')
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def set_desc(self, value):
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if not value:
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return self.xdel('atom:subtitle|atom03:subtitle')
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table = {'atom:feed': 'atom:subtitle',
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'atom03:feed': 'atom03:subtitle'}
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element = self.xget_create(table)
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element.text = value
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def get_items(self):
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return self.xpath('atom:entry|atom03:entry')
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class FeedItem(FeedBase):
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timeFormat = ''
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dic = ('title', 'link', 'desc', 'content', 'id', 'is_permalink', 'time', 'updated')
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def __init__(self, xml=None, tag='atom:feed'):
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if xml is None:
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xml = Element(tag_NS(self.base[tag]))
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self.root = self.xml = xml
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self.tag = tag
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def get_title(self):
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return ""
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def set_title(self, value):
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pass
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def del_title(self):
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self.title = ""
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def get_link(self):
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return ""
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def set_link(self, value):
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pass
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def del_link(self):
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self.link = ""
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def get_is_permalink(self):
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return ""
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def set_is_permalink(self, value):
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pass
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def get_desc(self):
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return ""
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def set_desc(self, value):
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pass
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def del_desc(self):
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self.desc = ""
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def get_content(self):
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return ""
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def set_content(self, value):
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pass
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def del_content(self):
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self.content = ""
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def get_id(self):
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return ""
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def set_id(self, value):
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pass
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def del_id(self):
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self.id = ""
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def get_time(self):
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return None
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def set_time(self, value):
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pass
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def delTime(self):
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self.time = None
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def get_updated(self):
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return None
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def set_updated(self, value):
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pass
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def del_updated(self):
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self.updated = None
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title = FeedDescriptor('title')
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link = FeedDescriptor('link')
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description = desc = FeedDescriptor('desc')
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content = FeedDescriptor('content')
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id = FeedDescriptor('id')
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is_permalink = FeedBool('is_permalink')
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time = FeedTime('time')
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updated = FeedTime('updated')
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def push_content(self, value):
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if not self.desc and self.content:
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self.desc = self.content
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self.content = value
|
|
|
|
def remove(self):
|
|
self.xml.getparent().remove(self.xml)
|
|
|
|
|
|
class FeedItemRSS(FeedItem):
|
|
timeFormat = '%a, %d %b %Y %H:%M:%S %Z'
|
|
base = {'rdf:rdf': 'rssfake:item',
|
|
'channel': 'item'}
|
|
|
|
def get_title(self):
|
|
return self.xval('rssfake:title|title')
|
|
|
|
def set_title(self, value):
|
|
if not value:
|
|
return self.xdel('rssfake:title|title')
|
|
|
|
table = {'rdf:rdf': 'rssfake:title',
|
|
'channel': 'title'}
|
|
element = self.xget_create(table)
|
|
element.text = value
|
|
|
|
def get_link(self):
|
|
return self.xval('rssfake:link|link')
|
|
|
|
def set_link(self, value):
|
|
if self.is_permalink and self.id == self.link != value:
|
|
self.is_permalink = False
|
|
|
|
table = {'rdf:rdf': 'rssfake:link',
|
|
'channel': 'link'}
|
|
element = self.xget_create(table)
|
|
element.text = value
|
|
|
|
def get_desc(self):
|
|
return self.xval('rssfake:description|description')
|
|
|
|
def set_desc(self, value):
|
|
if not value:
|
|
return self.xdel('rssfake:description|description')
|
|
|
|
table = {'rdf:rdf': 'rssfake:description',
|
|
'channel': 'description'}
|
|
element = self.xget_create(table)
|
|
element.text = value
|
|
|
|
def get_content(self):
|
|
return self.xval('content:encoded')
|
|
|
|
def set_content(self, value):
|
|
if not value:
|
|
return self.xdel('content:encoded')
|
|
|
|
table = {'rdf:rdf': 'content:encoded',
|
|
'channel': 'content:encoded'}
|
|
element = self.xget_create(table)
|
|
element.text = value
|
|
|
|
def get_id(self):
|
|
return self.xval('rssfake:guid|guid')
|
|
|
|
def set_id(self, value):
|
|
if not value:
|
|
return self.xdel('rssfake:guid|guid')
|
|
|
|
table = {'rdf:rdf': 'rssfake:guid',
|
|
'channel': 'guid'}
|
|
element = self.xget_create(table)
|
|
element.text = value
|
|
|
|
def get_is_permalink(self):
|
|
return self.xget('rssfake:guid/@isPermaLink|guid/@isPermaLink')
|
|
|
|
def set_is_permalink(self, value):
|
|
table = {'rdf:rdf': 'rssfake:guid',
|
|
'channel': 'guid'}
|
|
element = self.xget_create(table)
|
|
element.attrib['isPermaLink'] = value
|
|
|
|
def get_time(self):
|
|
return self.xval('rssfake:pubDate|pubDate')
|
|
|
|
def set_time(self, value):
|
|
if not value:
|
|
return self.xdel('rssfake:pubDate|pubDate')
|
|
|
|
table = {'rdf:rdf': 'rssfake:pubDate',
|
|
'channel': 'pubDate'}
|
|
element = self.xget_create(table)
|
|
element.text = value
|
|
|
|
|
|
class FeedItemAtom(FeedItem):
|
|
timeFormat = '%Y-%m-%dT%H:%M:%SZ'
|
|
base = {'atom:feed': 'atom:entry',
|
|
'atom03:feed': 'atom03:entry'}
|
|
|
|
def get_title(self):
|
|
return self.xval('atom:title|atom03:title')
|
|
|
|
def set_title(self, value):
|
|
if not value:
|
|
return self.xdel('atom:title|atom03:title')
|
|
|
|
table = {'atom:feed': 'atom:title',
|
|
'atom03:feed': 'atom03:title'}
|
|
element = self.xget_create(table)
|
|
element.text = value
|
|
|
|
def get_link(self):
|
|
return self.xget('(atom:link|atom03:link)[@rel="alternate" or not(@rel)]/@href')
|
|
|
|
def set_link(self, value):
|
|
table = {'atom:feed': ('atom:link', 'atom:link[@rel="alternate" or not(@rel)]'),
|
|
'atom03:feed': ('atom03:link', 'atom03:link[@rel="alternate" or not(@rel)]')}
|
|
element = self.xget_create(table)
|
|
element.attrib['href'] = value
|
|
|
|
def get_desc(self):
|
|
# default "type" is "text"
|
|
element = self.xget('atom:summary|atom03:summary')
|
|
if element is not None:
|
|
return inner_html(element)
|
|
else:
|
|
return ""
|
|
|
|
def set_desc(self, value):
|
|
if not value:
|
|
return self.xdel('atom:summary|atom03:summary')
|
|
|
|
table = {'atom:feed': 'atom:summary',
|
|
'atom03:feed': 'atom03:summary'}
|
|
element = self.xget_create(table)
|
|
if element.attrib.get('type', '') == 'xhtml':
|
|
clean_node(element)
|
|
element.attrib['type'] = 'html'
|
|
element.text = value
|
|
|
|
def get_content(self):
|
|
element = self.xget('atom:content|atom03:content')
|
|
if element is not None:
|
|
return inner_html(element)
|
|
else:
|
|
return ""
|
|
|
|
def set_content(self, value):
|
|
if not value:
|
|
return self.xdel('atom:content|atom03:content')
|
|
|
|
table = {'atom:feed': 'atom:content',
|
|
'atom03:feed': 'atom03:content'}
|
|
element = self.xget_create(table)
|
|
if element.attrib.get('type', '') == 'xhtml':
|
|
clean_node(element)
|
|
element.attrib['type'] = 'html'
|
|
element.text = value
|
|
|
|
def get_id(self):
|
|
return self.xval('atom:id|atom03:id')
|
|
|
|
def set_id(self, value):
|
|
if not value:
|
|
return self.xdel('atom:id|atom03:id')
|
|
|
|
table = {'atom:feed': 'atom:id',
|
|
'atom03:feed': 'atom03:id'}
|
|
element = self.xget_create(table)
|
|
element.text = value
|
|
|
|
def get_time(self):
|
|
return self.xval('atom:published|atom03:published')
|
|
|
|
def set_time(self, value):
|
|
if not value:
|
|
return self.xdel('atom:published|atom03:published')
|
|
|
|
table = {'atom:feed': 'atom:published',
|
|
'atom03:feed': 'atom03:published'}
|
|
element = self.xget_create(table)
|
|
element.text = value
|
|
|
|
def get_updated(self):
|
|
return self.xval('atom:updated|atom03:updated')
|
|
|
|
def set_updated(self, value):
|
|
if not value:
|
|
return self.xdel('atom:updated|atom03:updated')
|
|
|
|
table = {'atom:feed': 'atom:updated',
|
|
'atom03:feed': 'atom03:updated'}
|
|
element = self.xget_create(table)
|
|
element.text = value
|