feeds: remove FeedList(Descriptor)
parent
081d560bc4
commit
8487a43c6c
160
morss/feeds.py
160
morss/feeds.py
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@ -110,21 +110,12 @@ class FeedBase(object):
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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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def iterdic(self):
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for element in self.dic:
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value = self[element]
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value = getattr(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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if element == 'items':
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value = [OrderedDict(x.iterdic()) for x in value]
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elif isinstance(value, datetime):
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value = value.isoformat()
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@ -242,67 +233,6 @@ def parse_time(value):
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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 Uniq(object):
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_map = {}
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_id = None
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@ -322,30 +252,6 @@ class Uniq(object):
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cls._map[obj._id] = obj
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return obj
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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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@ -360,6 +266,8 @@ class FeedParser(FeedBase):
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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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self.itemsClass = globals()[self.itemsClass]
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def get_title(self):
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return ""
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@ -381,6 +289,9 @@ class FeedParser(FeedBase):
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def get_items(self):
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return []
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def wrap_items(self, items):
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return [self.itemsClass(x, self.tag) for x in items]
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title = property(
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lambda f: f.get_title(),
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lambda f,x: f.set_title(x),
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@ -389,23 +300,52 @@ class FeedParser(FeedBase):
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lambda f: f.get_desc(),
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lambda f,x: f.set_desc(x),
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lambda f: f.del_desc() )
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items = FeedListDescriptor('items')
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items = property(
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lambda f: f )
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def append(self, cousin=None):
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new = self.itemsClass(tag=self.tag)
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self.root.append(new.xml)
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if cousin is None:
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return new
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for attr in self.itemsClass.dic:
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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.wrap_items(self.get_items())[key]
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def __delitem__(self, key):
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self[key].remove()
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def __len__(self):
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return len(self.get_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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return json.dumps(OrderedDict(self.iterdic()), 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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row = [getattr(item, x) for x in item.dic]
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if sys.version_info[0] < 3:
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row = [x.encode('utf-8') if isinstance(x, unicode) else x for x in row]
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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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@ -492,7 +432,7 @@ class FeedParserAtom(FeedParser):
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return self.xpath('atom:entry|atom03:entry')
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class FeedItem(FeedBase):
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class FeedItem(FeedBase, Uniq):
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timeFormat = ''
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dic = ('title', 'link', 'desc', 'content', 'id', 'is_permalink', 'time', 'updated')
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@ -500,9 +440,19 @@ class FeedItem(FeedBase):
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if xml is None:
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xml = Element(tag_NS(self.base[tag]))
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self._id = FeedItem._gen_id(xml)
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self.root = self.xml = xml
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self.tag = tag
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@classmethod
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def _gen_id(cls, xml=None, *args, **kwargs):
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if xml is not None:
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return id(xml)
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else:
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return None
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def get_title(self):
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return ""
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