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#!/usr/bin/python
#
# Copyright (C) 2006 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Contains classes representing Atom elements.
Module objective: provide data classes for Atom constructs. These classes hide
the XML-ness of Atom and provide a set of native Python classes to interact
with.
Conversions to and from XML should only be necessary when the Atom classes
"touch the wire" and are sent over HTTP. For this reason this module
provides methods and functions to convert Atom classes to and from strings.
For more information on the Atom data model, see RFC 4287
(http://www.ietf.org/rfc/rfc4287.txt)
AtomBase: A foundation class on which Atom classes are built. It
handles the parsing of attributes and children which are common to all
Atom classes. By default, the AtomBase class translates all XML child
nodes into ExtensionElements.
ExtensionElement: Atom allows Atom objects to contain XML which is not part
of the Atom specification, these are called extension elements. If a
classes parser encounters an unexpected XML construct, it is translated
into an ExtensionElement instance. ExtensionElement is designed to fully
capture the information in the XML. Child nodes in an XML extension are
turned into ExtensionElements as well.
"""
__author__ = 'api.jscudder (Jeffrey Scudder)'
try:
from xml.etree import cElementTree as ElementTree
except ImportError:
try:
import cElementTree as ElementTree
except ImportError:
try:
from xml.etree import ElementTree
except ImportError:
from elementtree import ElementTree
import warnings
# XML namespaces which are often used in Atom entities.
ATOM_NAMESPACE = 'http://www.w3.org/2005/Atom'
ELEMENT_TEMPLATE = '{http://www.w3.org/2005/Atom}%s'
APP_NAMESPACE = 'http://purl.org/atom/app#'
APP_TEMPLATE = '{http://purl.org/atom/app#}%s'
# This encoding is used for converting strings before translating the XML
# into an object.
XML_STRING_ENCODING = 'utf-8'
# The desired string encoding for object members. set or monkey-patch to
# unicode if you want object members to be Python unicode strings, instead of
# encoded strings
MEMBER_STRING_ENCODING = 'utf-8'
#MEMBER_STRING_ENCODING = unicode
# If True, all methods which are exclusive to v1 will raise a
# DeprecationWarning
ENABLE_V1_WARNINGS = False
def v1_deprecated(warning=None):
"""Shows a warning if ENABLE_V1_WARNINGS is True.
Function decorator used to mark methods used in v1 classes which
may be removed in future versions of the library.
"""
warning = warning or ''
# This closure is what is returned from the deprecated function.
def mark_deprecated(f):
# The deprecated_function wraps the actual call to f.
def optional_warn_function(*args, **kwargs):
if ENABLE_V1_WARNINGS:
warnings.warn(warning, DeprecationWarning, stacklevel=2)
return f(*args, **kwargs)
# Preserve the original name to avoid masking all decorated functions as
# 'deprecated_function'
try:
optional_warn_function.func_name = f.func_name
except TypeError:
pass # In Python2.3 we can't set the func_name
return optional_warn_function
return mark_deprecated
def CreateClassFromXMLString(target_class, xml_string, string_encoding=None):
"""Creates an instance of the target class from the string contents.
Args:
target_class: class The class which will be instantiated and populated
with the contents of the XML. This class must have a _tag and a
_namespace class variable.
xml_string: str A string which contains valid XML. The root element
of the XML string should match the tag and namespace of the desired
class.
string_encoding: str The character encoding which the xml_string should
be converted to before it is interpreted and translated into
objects. The default is None in which case the string encoding
is not changed.
Returns:
An instance of the target class with members assigned according to the
contents of the XML - or None if the root XML tag and namespace did not
match those of the target class.
"""
encoding = string_encoding or XML_STRING_ENCODING
if encoding and isinstance(xml_string, unicode):
xml_string = xml_string.encode(encoding)
tree = ElementTree.fromstring(xml_string)
return _CreateClassFromElementTree(target_class, tree)
CreateClassFromXMLString = v1_deprecated(
'Please use atom.core.parse with atom.data classes instead.')(
CreateClassFromXMLString)
def _CreateClassFromElementTree(target_class, tree, namespace=None, tag=None):
"""Instantiates the class and populates members according to the tree.
Note: Only use this function with classes that have _namespace and _tag
class members.
Args:
target_class: class The class which will be instantiated and populated
with the contents of the XML.
tree: ElementTree An element tree whose contents will be converted into
members of the new target_class instance.
namespace: str (optional) The namespace which the XML tree's root node must
match. If omitted, the namespace defaults to the _namespace of the
target class.
tag: str (optional) The tag which the XML tree's root node must match. If
omitted, the tag defaults to the _tag class member of the target
class.
Returns:
An instance of the target class - or None if the tag and namespace of
the XML tree's root node did not match the desired namespace and tag.
"""
if namespace is None:
namespace = target_class._namespace
if tag is None:
tag = target_class._tag
if tree.tag == '{%s}%s' % (namespace, tag):
target = target_class()
target._HarvestElementTree(tree)
return target
else:
return None
class ExtensionContainer(object):
def __init__(self, extension_elements=None, extension_attributes=None,
text=None):
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
self.text = text
__init__ = v1_deprecated(
'Please use data model classes in atom.data instead.')(
__init__)
# Three methods to create an object from an ElementTree
def _HarvestElementTree(self, tree):
# Fill in the instance members from the contents of the XML tree.
for child in tree:
self._ConvertElementTreeToMember(child)
for attribute, value in tree.attrib.iteritems():
self._ConvertElementAttributeToMember(attribute, value)
# Encode the text string according to the desired encoding type. (UTF-8)
if tree.text:
if MEMBER_STRING_ENCODING is unicode:
self.text = tree.text
else:
self.text = tree.text.encode(MEMBER_STRING_ENCODING)
def _ConvertElementTreeToMember(self, child_tree, current_class=None):
self.extension_elements.append(_ExtensionElementFromElementTree(
child_tree))
def _ConvertElementAttributeToMember(self, attribute, value):
# Encode the attribute value's string with the desired type Default UTF-8
if value:
if MEMBER_STRING_ENCODING is unicode:
self.extension_attributes[attribute] = value
else:
self.extension_attributes[attribute] = value.encode(
MEMBER_STRING_ENCODING)
# One method to create an ElementTree from an object
def _AddMembersToElementTree(self, tree):
for child in self.extension_elements:
child._BecomeChildElement(tree)
for attribute, value in self.extension_attributes.iteritems():
if value:
if isinstance(value, unicode) or MEMBER_STRING_ENCODING is unicode:
tree.attrib[attribute] = value
else:
# Decode the value from the desired encoding (default UTF-8).
tree.attrib[attribute] = value.decode(MEMBER_STRING_ENCODING)
if self.text:
if isinstance(self.text, unicode) or MEMBER_STRING_ENCODING is unicode:
tree.text = self.text
else:
tree.text = self.text.decode(MEMBER_STRING_ENCODING)
def FindExtensions(self, tag=None, namespace=None):
"""Searches extension elements for child nodes with the desired name.
Returns a list of extension elements within this object whose tag
and/or namespace match those passed in. To find all extensions in
a particular namespace, specify the namespace but not the tag name.
If you specify only the tag, the result list may contain extension
elements in multiple namespaces.
Args:
tag: str (optional) The desired tag
namespace: str (optional) The desired namespace
Returns:
A list of elements whose tag and/or namespace match the parameters
values
"""
results = []
if tag and namespace:
for element in self.extension_elements:
if element.tag == tag and element.namespace == namespace:
results.append(element)
elif tag and not namespace:
for element in self.extension_elements:
if element.tag == tag:
results.append(element)
elif namespace and not tag:
for element in self.extension_elements:
if element.namespace == namespace:
results.append(element)
else:
for element in self.extension_elements:
results.append(element)
return results
class AtomBase(ExtensionContainer):
_children = {}
_attributes = {}
def __init__(self, extension_elements=None, extension_attributes=None,
text=None):
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
self.text = text
__init__ = v1_deprecated(
'Please use data model classes in atom.data instead.')(
__init__)
def _ConvertElementTreeToMember(self, child_tree):
# Find the element's tag in this class's list of child members
if self.__class__._children.has_key(child_tree.tag):
member_name = self.__class__._children[child_tree.tag][0]
member_class = self.__class__._children[child_tree.tag][1]
# If the class member is supposed to contain a list, make sure the
# matching member is set to a list, then append the new member
# instance to the list.
if isinstance(member_class, list):
if getattr(self, member_name) is None:
setattr(self, member_name, [])
getattr(self, member_name).append(_CreateClassFromElementTree(
member_class[0], child_tree))
else:
setattr(self, member_name,
_CreateClassFromElementTree(member_class, child_tree))
else:
ExtensionContainer._ConvertElementTreeToMember(self, child_tree)
def _ConvertElementAttributeToMember(self, attribute, value):
# Find the attribute in this class's list of attributes.
if self.__class__._attributes.has_key(attribute):
# Find the member of this class which corresponds to the XML attribute
# (lookup in current_class._attributes) and set this member to the
# desired value (using self.__dict__).
if value:
# Encode the string to capture non-ascii characters (default UTF-8)
if MEMBER_STRING_ENCODING is unicode:
setattr(self, self.__class__._attributes[attribute], value)
else:
setattr(self, self.__class__._attributes[attribute],
value.encode(MEMBER_STRING_ENCODING))
else:
ExtensionContainer._ConvertElementAttributeToMember(
self, attribute, value)
# Three methods to create an ElementTree from an object
def _AddMembersToElementTree(self, tree):
# Convert the members of this class which are XML child nodes.
# This uses the class's _children dictionary to find the members which
# should become XML child nodes.
member_node_names = [values[0] for tag, values in
self.__class__._children.iteritems()]
for member_name in member_node_names:
member = getattr(self, member_name)
if member is None:
pass
elif isinstance(member, list):
for instance in member:
instance._BecomeChildElement(tree)
else:
member._BecomeChildElement(tree)
# Convert the members of this class which are XML attributes.
for xml_attribute, member_name in self.__class__._attributes.iteritems():
member = getattr(self, member_name)
if member is not None:
if isinstance(member, unicode) or MEMBER_STRING_ENCODING is unicode:
tree.attrib[xml_attribute] = member
else:
tree.attrib[xml_attribute] = member.decode(MEMBER_STRING_ENCODING)
# Lastly, call the ExtensionContainers's _AddMembersToElementTree to
# convert any extension attributes.
ExtensionContainer._AddMembersToElementTree(self, tree)
def _BecomeChildElement(self, tree):
"""
Note: Only for use with classes that have a _tag and _namespace class
member. It is in AtomBase so that it can be inherited but it should
not be called on instances of AtomBase.
"""
new_child = ElementTree.Element('')
tree.append(new_child)
new_child.tag = '{%s}%s' % (self.__class__._namespace,
self.__class__._tag)
self._AddMembersToElementTree(new_child)
def _ToElementTree(self):
"""
Note, this method is designed to be used only with classes that have a
_tag and _namespace. It is placed in AtomBase for inheritance but should
not be called on this class.
"""
new_tree = ElementTree.Element('{%s}%s' % (self.__class__._namespace,
self.__class__._tag))
self._AddMembersToElementTree(new_tree)
return new_tree
def ToString(self, string_encoding='UTF-8'):
"""Converts the Atom object to a string containing XML."""
return ElementTree.tostring(self._ToElementTree(), encoding=string_encoding)
def __str__(self):
return self.ToString()
class Name(AtomBase):
"""The atom:name element"""
_tag = 'name'
_namespace = ATOM_NAMESPACE
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
def __init__(self, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Name
Args:
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def NameFromString(xml_string):
return CreateClassFromXMLString(Name, xml_string)
class Email(AtomBase):
"""The atom:email element"""
_tag = 'email'
_namespace = ATOM_NAMESPACE
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
def __init__(self, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Email
Args:
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
text: str The text data in the this element
"""
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def EmailFromString(xml_string):
return CreateClassFromXMLString(Email, xml_string)
class Uri(AtomBase):
"""The atom:uri element"""
_tag = 'uri'
_namespace = ATOM_NAMESPACE
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
def __init__(self, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Uri
Args:
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
text: str The text data in the this element
"""
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def UriFromString(xml_string):
return CreateClassFromXMLString(Uri, xml_string)
class Person(AtomBase):
"""A foundation class from which atom:author and atom:contributor extend.
A person contains information like name, email address, and web page URI for
an author or contributor to an Atom feed.
"""
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
_children['{%s}name' % (ATOM_NAMESPACE)] = ('name', Name)
_children['{%s}email' % (ATOM_NAMESPACE)] = ('email', Email)
_children['{%s}uri' % (ATOM_NAMESPACE)] = ('uri', Uri)
def __init__(self, name=None, email=None, uri=None,
extension_elements=None, extension_attributes=None, text=None):
"""Foundation from which author and contributor are derived.
The constructor is provided for illustrative purposes, you should not
need to instantiate a Person.
Args:
name: Name The person's name
email: Email The person's email address
uri: Uri The URI of the person's webpage
extension_elements: list A list of ExtensionElement instances which are
children of this element.
extension_attributes: dict A dictionary of strings which are the values
for additional XML attributes of this element.
text: String The text contents of the element. This is the contents
of the Entry's XML text node. (Example: <foo>This is the text</foo>)
"""
self.name = name
self.email = email
self.uri = uri
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
self.text = text
class Author(Person):
"""The atom:author element
An author is a required element in Feed.
"""
_tag = 'author'
_namespace = ATOM_NAMESPACE
_children = Person._children.copy()
_attributes = Person._attributes.copy()
#_children = {}
#_attributes = {}
def __init__(self, name=None, email=None, uri=None,
extension_elements=None, extension_attributes=None, text=None):
"""Constructor for Author
Args:
name: Name
email: Email
uri: Uri
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
text: str The text data in the this element
"""
self.name = name
self.email = email
self.uri = uri
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
self.text = text
def AuthorFromString(xml_string):
return CreateClassFromXMLString(Author, xml_string)
class Contributor(Person):
"""The atom:contributor element"""
_tag = 'contributor'
_namespace = ATOM_NAMESPACE
_children = Person._children.copy()
_attributes = Person._attributes.copy()
def __init__(self, name=None, email=None, uri=None,
extension_elements=None, extension_attributes=None, text=None):
"""Constructor for Contributor
Args:
name: Name
email: Email
uri: Uri
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
text: str The text data in the this element
"""
self.name = name
self.email = email
self.uri = uri
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
self.text = text
def ContributorFromString(xml_string):
return CreateClassFromXMLString(Contributor, xml_string)
class Link(AtomBase):
"""The atom:link element"""
_tag = 'link'
_namespace = ATOM_NAMESPACE
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
_attributes['rel'] = 'rel'
_attributes['href'] = 'href'
_attributes['type'] = 'type'
_attributes['title'] = 'title'
_attributes['length'] = 'length'
_attributes['hreflang'] = 'hreflang'
def __init__(self, href=None, rel=None, link_type=None, hreflang=None,
title=None, length=None, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Link
Args:
href: string The href attribute of the link
rel: string
type: string
hreflang: string The language for the href
title: string
length: string The length of the href's destination
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
text: str The text data in the this element
"""
self.href = href
self.rel = rel
self.type = link_type
self.hreflang = hreflang
self.title = title
self.length = length
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def LinkFromString(xml_string):
return CreateClassFromXMLString(Link, xml_string)
class Generator(AtomBase):
"""The atom:generator element"""
_tag = 'generator'
_namespace = ATOM_NAMESPACE
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
_attributes['uri'] = 'uri'
_attributes['version'] = 'version'
def __init__(self, uri=None, version=None, text=None,
extension_elements=None, extension_attributes=None):
"""Constructor for Generator
Args:
uri: string
version: string
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.uri = uri
self.version = version
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def GeneratorFromString(xml_string):
return CreateClassFromXMLString(Generator, xml_string)
class Text(AtomBase):
"""A foundation class from which atom:title, summary, etc. extend.
This class should never be instantiated.
"""
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
_attributes['type'] = 'type'
def __init__(self, text_type=None, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Text
Args:
text_type: string
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.type = text_type
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
class Title(Text):
"""The atom:title element"""
_tag = 'title'
_namespace = ATOM_NAMESPACE
_children = Text._children.copy()
_attributes = Text._attributes.copy()
def __init__(self, title_type=None, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Title
Args:
title_type: string
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.type = title_type
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def TitleFromString(xml_string):
return CreateClassFromXMLString(Title, xml_string)
class Subtitle(Text):
"""The atom:subtitle element"""
_tag = 'subtitle'
_namespace = ATOM_NAMESPACE
_children = Text._children.copy()
_attributes = Text._attributes.copy()
def __init__(self, subtitle_type=None, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Subtitle
Args:
subtitle_type: string
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.type = subtitle_type
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def SubtitleFromString(xml_string):
return CreateClassFromXMLString(Subtitle, xml_string)
class Rights(Text):
"""The atom:rights element"""
_tag = 'rights'
_namespace = ATOM_NAMESPACE
_children = Text._children.copy()
_attributes = Text._attributes.copy()
def __init__(self, rights_type=None, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Rights
Args:
rights_type: string
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.type = rights_type
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def RightsFromString(xml_string):
return CreateClassFromXMLString(Rights, xml_string)
class Summary(Text):
"""The atom:summary element"""
_tag = 'summary'
_namespace = ATOM_NAMESPACE
_children = Text._children.copy()
_attributes = Text._attributes.copy()
def __init__(self, summary_type=None, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Summary
Args:
summary_type: string
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.type = summary_type
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def SummaryFromString(xml_string):
return CreateClassFromXMLString(Summary, xml_string)
class Content(Text):
"""The atom:content element"""
_tag = 'content'
_namespace = ATOM_NAMESPACE
_children = Text._children.copy()
_attributes = Text._attributes.copy()
_attributes['src'] = 'src'
def __init__(self, content_type=None, src=None, text=None,
extension_elements=None, extension_attributes=None):
"""Constructor for Content
Args:
content_type: string
src: string
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.type = content_type
self.src = src
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def ContentFromString(xml_string):
return CreateClassFromXMLString(Content, xml_string)
class Category(AtomBase):
"""The atom:category element"""
_tag = 'category'
_namespace = ATOM_NAMESPACE
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
_attributes['term'] = 'term'
_attributes['scheme'] = 'scheme'
_attributes['label'] = 'label'
def __init__(self, term=None, scheme=None, label=None, text=None,
extension_elements=None, extension_attributes=None):
"""Constructor for Category
Args:
term: str
scheme: str
label: str
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.term = term
self.scheme = scheme
self.label = label
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def CategoryFromString(xml_string):
return CreateClassFromXMLString(Category, xml_string)
class Id(AtomBase):
"""The atom:id element."""
_tag = 'id'
_namespace = ATOM_NAMESPACE
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
def __init__(self, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Id
Args:
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def IdFromString(xml_string):
return CreateClassFromXMLString(Id, xml_string)
class Icon(AtomBase):
"""The atom:icon element."""
_tag = 'icon'
_namespace = ATOM_NAMESPACE
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
def __init__(self, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Icon
Args:
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def IconFromString(xml_string):
return CreateClassFromXMLString(Icon, xml_string)
class Logo(AtomBase):
"""The atom:logo element."""
_tag = 'logo'
_namespace = ATOM_NAMESPACE
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
def __init__(self, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Logo
Args:
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def LogoFromString(xml_string):
return CreateClassFromXMLString(Logo, xml_string)
class Draft(AtomBase):
"""The app:draft element which indicates if this entry should be public."""
_tag = 'draft'
_namespace = APP_NAMESPACE
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
def __init__(self, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for app:draft
Args:
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def DraftFromString(xml_string):
return CreateClassFromXMLString(Draft, xml_string)
class Control(AtomBase):
"""The app:control element indicating restrictions on publication.
The APP control element may contain a draft element indicating whether or
not this entry should be publicly available.
"""
_tag = 'control'
_namespace = APP_NAMESPACE
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
_children['{%s}draft' % APP_NAMESPACE] = ('draft', Draft)
def __init__(self, draft=None, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for app:control"""
self.draft = draft
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def ControlFromString(xml_string):
return CreateClassFromXMLString(Control, xml_string)
class Date(AtomBase):
"""A parent class for atom:updated, published, etc."""
#TODO Add text to and from time conversion methods to allow users to set
# the contents of a Date to a python DateTime object.
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
def __init__(self, text=None, extension_elements=None,
extension_attributes=None):
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
class Updated(Date):
"""The atom:updated element."""
_tag = 'updated'
_namespace = ATOM_NAMESPACE
_children = Date._children.copy()
_attributes = Date._attributes.copy()
def __init__(self, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Updated
Args:
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def UpdatedFromString(xml_string):
return CreateClassFromXMLString(Updated, xml_string)
class Published(Date):
"""The atom:published element."""
_tag = 'published'
_namespace = ATOM_NAMESPACE
_children = Date._children.copy()
_attributes = Date._attributes.copy()
def __init__(self, text=None, extension_elements=None,
extension_attributes=None):
"""Constructor for Published
Args:
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def PublishedFromString(xml_string):
return CreateClassFromXMLString(Published, xml_string)
class LinkFinder(object):
"""An "interface" providing methods to find link elements
Entry elements often contain multiple links which differ in the rel
attribute or content type. Often, developers are interested in a specific
type of link so this class provides methods to find specific classes of
links.
This class is used as a mixin in Atom entries and feeds.
"""
def GetSelfLink(self):
"""Find the first link with rel set to 'self'
Returns:
An atom.Link or none if none of the links had rel equal to 'self'
"""
for a_link in self.link:
if a_link.rel == 'self':
return a_link
return None
def GetEditLink(self):
for a_link in self.link:
if a_link.rel == 'edit':
return a_link
return None
def GetEditMediaLink(self):
for a_link in self.link:
if a_link.rel == 'edit-media':
return a_link
return None
def GetNextLink(self):
for a_link in self.link:
if a_link.rel == 'next':
return a_link
return None
def GetLicenseLink(self):
for a_link in self.link:
if a_link.rel == 'license':
return a_link
return None
def GetAlternateLink(self):
for a_link in self.link:
if a_link.rel == 'alternate':
return a_link
return None
class FeedEntryParent(AtomBase, LinkFinder):
"""A super class for atom:feed and entry, contains shared attributes"""
_children = AtomBase._children.copy()
_attributes = AtomBase._attributes.copy()
_children['{%s}author' % ATOM_NAMESPACE] = ('author', [Author])
_children['{%s}category' % ATOM_NAMESPACE] = ('category', [Category])
_children['{%s}contributor' % ATOM_NAMESPACE] = ('contributor', [Contributor])
_children['{%s}id' % ATOM_NAMESPACE] = ('id', Id)
_children['{%s}link' % ATOM_NAMESPACE] = ('link', [Link])
_children['{%s}rights' % ATOM_NAMESPACE] = ('rights', Rights)
_children['{%s}title' % ATOM_NAMESPACE] = ('title', Title)
_children['{%s}updated' % ATOM_NAMESPACE] = ('updated', Updated)
def __init__(self, author=None, category=None, contributor=None,
atom_id=None, link=None, rights=None, title=None, updated=None,
text=None, extension_elements=None, extension_attributes=None):
self.author = author or []
self.category = category or []
self.contributor = contributor or []
self.id = atom_id
self.link = link or []
self.rights = rights
self.title = title
self.updated = updated
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
class Source(FeedEntryParent):
"""The atom:source element"""
_tag = 'source'
_namespace = ATOM_NAMESPACE
_children = FeedEntryParent._children.copy()
_attributes = FeedEntryParent._attributes.copy()
_children['{%s}generator' % ATOM_NAMESPACE] = ('generator', Generator)
_children['{%s}icon' % ATOM_NAMESPACE] = ('icon', Icon)
_children['{%s}logo' % ATOM_NAMESPACE] = ('logo', Logo)
_children['{%s}subtitle' % ATOM_NAMESPACE] = ('subtitle', Subtitle)
def __init__(self, author=None, category=None, contributor=None,
generator=None, icon=None, atom_id=None, link=None, logo=None,
rights=None, subtitle=None, title=None, updated=None, text=None,
extension_elements=None, extension_attributes=None):
"""Constructor for Source
Args:
author: list (optional) A list of Author instances which belong to this
class.
category: list (optional) A list of Category instances
contributor: list (optional) A list on Contributor instances
generator: Generator (optional)
icon: Icon (optional)
id: Id (optional) The entry's Id element
link: list (optional) A list of Link instances
logo: Logo (optional)
rights: Rights (optional) The entry's Rights element
subtitle: Subtitle (optional) The entry's subtitle element
title: Title (optional) the entry's title element
updated: Updated (optional) the entry's updated element
text: String (optional) The text contents of the element. This is the
contents of the Entry's XML text node.
(Example: <foo>This is the text</foo>)
extension_elements: list (optional) A list of ExtensionElement instances
which are children of this element.
extension_attributes: dict (optional) A dictionary of strings which are
the values for additional XML attributes of this element.
"""
self.author = author or []
self.category = category or []
self.contributor = contributor or []
self.generator = generator
self.icon = icon
self.id = atom_id
self.link = link or []
self.logo = logo
self.rights = rights
self.subtitle = subtitle
self.title = title
self.updated = updated
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
def SourceFromString(xml_string):
return CreateClassFromXMLString(Source, xml_string)
class Entry(FeedEntryParent):
"""The atom:entry element"""
_tag = 'entry'
_namespace = ATOM_NAMESPACE
_children = FeedEntryParent._children.copy()
_attributes = FeedEntryParent._attributes.copy()
_children['{%s}content' % ATOM_NAMESPACE] = ('content', Content)
_children['{%s}published' % ATOM_NAMESPACE] = ('published', Published)
_children['{%s}source' % ATOM_NAMESPACE] = ('source', Source)
_children['{%s}summary' % ATOM_NAMESPACE] = ('summary', Summary)
_children['{%s}control' % APP_NAMESPACE] = ('control', Control)
def __init__(self, author=None, category=None, content=None,
contributor=None, atom_id=None, link=None, published=None, rights=None,
source=None, summary=None, control=None, title=None, updated=None,
extension_elements=None, extension_attributes=None, text=None):
"""Constructor for atom:entry
Args:
author: list A list of Author instances which belong to this class.
category: list A list of Category instances
content: Content The entry's Content
contributor: list A list on Contributor instances
id: Id The entry's Id element
link: list A list of Link instances
published: Published The entry's Published element
rights: Rights The entry's Rights element
source: Source the entry's source element
summary: Summary the entry's summary element
title: Title the entry's title element
updated: Updated the entry's updated element
control: The entry's app:control element which can be used to mark an
entry as a draft which should not be publicly viewable.
text: String The text contents of the element. This is the contents
of the Entry's XML text node. (Example: <foo>This is the text</foo>)
extension_elements: list A list of ExtensionElement instances which are
children of this element.
extension_attributes: dict A dictionary of strings which are the values
for additional XML attributes of this element.
"""
self.author = author or []
self.category = category or []
self.content = content
self.contributor = contributor or []
self.id = atom_id
self.link = link or []
self.published = published
self.rights = rights
self.source = source
self.summary = summary
self.title = title
self.updated = updated
self.control = control
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
__init__ = v1_deprecated('Please use atom.data.Entry instead.')(__init__)
def EntryFromString(xml_string):
return CreateClassFromXMLString(Entry, xml_string)
class Feed(Source):
"""The atom:feed element"""
_tag = 'feed'
_namespace = ATOM_NAMESPACE
_children = Source._children.copy()
_attributes = Source._attributes.copy()
_children['{%s}entry' % ATOM_NAMESPACE] = ('entry', [Entry])
def __init__(self, author=None, category=None, contributor=None,
generator=None, icon=None, atom_id=None, link=None, logo=None,
rights=None, subtitle=None, title=None, updated=None, entry=None,
text=None, extension_elements=None, extension_attributes=None):
"""Constructor for Source
Args:
author: list (optional) A list of Author instances which belong to this
class.
category: list (optional) A list of Category instances
contributor: list (optional) A list on Contributor instances
generator: Generator (optional)
icon: Icon (optional)
id: Id (optional) The entry's Id element
link: list (optional) A list of Link instances
logo: Logo (optional)
rights: Rights (optional) The entry's Rights element
subtitle: Subtitle (optional) The entry's subtitle element
title: Title (optional) the entry's title element
updated: Updated (optional) the entry's updated element
entry: list (optional) A list of the Entry instances contained in the
feed.
text: String (optional) The text contents of the element. This is the
contents of the Entry's XML text node.
(Example: <foo>This is the text</foo>)
extension_elements: list (optional) A list of ExtensionElement instances
which are children of this element.
extension_attributes: dict (optional) A dictionary of strings which are
the values for additional XML attributes of this element.
"""
self.author = author or []
self.category = category or []
self.contributor = contributor or []
self.generator = generator
self.icon = icon
self.id = atom_id
self.link = link or []
self.logo = logo
self.rights = rights
self.subtitle = subtitle
self.title = title
self.updated = updated
self.entry = entry or []
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
__init__ = v1_deprecated('Please use atom.data.Feed instead.')(__init__)
def FeedFromString(xml_string):
return CreateClassFromXMLString(Feed, xml_string)
class ExtensionElement(object):
"""Represents extra XML elements contained in Atom classes."""
def __init__(self, tag, namespace=None, attributes=None,
children=None, text=None):
"""Constructor for EtensionElement
Args:
namespace: string (optional) The XML namespace for this element.
tag: string (optional) The tag (without the namespace qualifier) for
this element. To reconstruct the full qualified name of the element,
combine this tag with the namespace.
attributes: dict (optinal) The attribute value string pairs for the XML
attributes of this element.
children: list (optional) A list of ExtensionElements which represent
the XML child nodes of this element.
"""
self.namespace = namespace
self.tag = tag
self.attributes = attributes or {}
self.children = children or []
self.text = text
def ToString(self):
element_tree = self._TransferToElementTree(ElementTree.Element(''))
return ElementTree.tostring(element_tree, encoding="UTF-8")
def _TransferToElementTree(self, element_tree):
if self.tag is None:
return None
if self.namespace is not None:
element_tree.tag = '{%s}%s' % (self.namespace, self.tag)
else:
element_tree.tag = self.tag
for key, value in self.attributes.iteritems():
element_tree.attrib[key] = value
for child in self.children:
child._BecomeChildElement(element_tree)
element_tree.text = self.text
return element_tree
def _BecomeChildElement(self, element_tree):
"""Converts this object into an etree element and adds it as a child node.
Adds self to the ElementTree. This method is required to avoid verbose XML
which constantly redefines the namespace.
Args:
element_tree: ElementTree._Element The element to which this object's XML
will be added.
"""
new_element = ElementTree.Element('')
element_tree.append(new_element)
self._TransferToElementTree(new_element)
def FindChildren(self, tag=None, namespace=None):
"""Searches child nodes for objects with the desired tag/namespace.
Returns a list of extension elements within this object whose tag
and/or namespace match those passed in. To find all children in
a particular namespace, specify the namespace but not the tag name.
If you specify only the tag, the result list may contain extension
elements in multiple namespaces.
Args:
tag: str (optional) The desired tag
namespace: str (optional) The desired namespace
Returns:
A list of elements whose tag and/or namespace match the parameters
values
"""
results = []
if tag and namespace:
for element in self.children:
if element.tag == tag and element.namespace == namespace:
results.append(element)
elif tag and not namespace:
for element in self.children:
if element.tag == tag:
results.append(element)
elif namespace and not tag:
for element in self.children:
if element.namespace == namespace:
results.append(element)
else:
for element in self.children:
results.append(element)
return results
def ExtensionElementFromString(xml_string):
element_tree = ElementTree.fromstring(xml_string)
return _ExtensionElementFromElementTree(element_tree)
def _ExtensionElementFromElementTree(element_tree):
element_tag = element_tree.tag
if '}' in element_tag:
namespace = element_tag[1:element_tag.index('}')]
tag = element_tag[element_tag.index('}')+1:]
else:
namespace = None
tag = element_tag
extension = ExtensionElement(namespace=namespace, tag=tag)
for key, value in element_tree.attrib.iteritems():
extension.attributes[key] = value
for child in element_tree:
extension.children.append(_ExtensionElementFromElementTree(child))
extension.text = element_tree.text
return extension
def deprecated(warning=None):
"""Decorator to raise warning each time the function is called.
Args:
warning: The warning message to be displayed as a string (optinoal).
"""
warning = warning or ''
# This closure is what is returned from the deprecated function.
def mark_deprecated(f):
# The deprecated_function wraps the actual call to f.
def deprecated_function(*args, **kwargs):
warnings.warn(warning, DeprecationWarning, stacklevel=2)
return f(*args, **kwargs)
# Preserve the original name to avoid masking all decorated functions as
# 'deprecated_function'
try:
deprecated_function.func_name = f.func_name
except TypeError:
# Setting the func_name is not allowed in Python2.3.
pass
return deprecated_function
return mark_deprecated