From 095af7c57aa7140975a073591930eb22274f0e21 Mon Sep 17 00:00:00 2001 From: Lars Kiesow Date: Mon, 27 May 2013 18:12:14 +0200 Subject: [PATCH] Started working on Dublin Core Elements extension --- feedgen/ext/dc_elements.py | 204 +++++++++++++++++++++++++++++++++++++ 1 file changed, 204 insertions(+) create mode 100644 feedgen/ext/dc_elements.py diff --git a/feedgen/ext/dc_elements.py b/feedgen/ext/dc_elements.py new file mode 100644 index 0000000..488c246 --- /dev/null +++ b/feedgen/ext/dc_elements.py @@ -0,0 +1,204 @@ +# -*- coding: utf-8 -*- +''' + feedgen.ext.podcast + ~~~~~~~~~~~~~~~~~~~ + + Extends the FeedGenerator to produce podcasts. + + Descriptions partly taken from + http://dublincore.org/documents/dcmi-terms/#elements-coverage + + :copyright: 2013, Lars Kiesow + + :license: FreeBSD and LGPL, see license.* for more details. +''' + +from lxml import etree +from feedgen.ext.base import BaseExtension + + +class PodcastExtension(BaseExtension): + '''FeedGenerator extension for podcasts. + ''' + + + def __init__(self): + # http://dublincore.org/documents/usageguide/elements.shtml + # http://dublincore.org/documents/dces/ + # http://dublincore.org/documents/dcmi-terms/ + self.__dcelem_contributor = None + self.__dcelem_coverage = None + self.__dcelem_creator = None + self.__dcelem_date = None + self.__dcelem_description = None + self.__dcelem_format = None + self.__dcelem_identifier = None + self.__dcelem_language = None + self.__dcelem_publisher = None + self.__dcelem_relation = None + self.__dcelem_rights = None + self.__dcelem_source = None + self.__dcelem_subject = None + self.__dcelem_title = None + self.__dcelem_type = None + + + def extend_rss(self, rss_feed): + '''Create an RSS feed xml structure containing all previously set fields. + + :returns: Tuple containing the feed root element and the element tree. + ''' + DCELEMENTS_NS = 'http://purl.org/dc/elements/1.1/' + # Replace the root element to add the new namespace + nsmap = rss_feed.nsmap + nsmap['dc'] = DCELEMENTS_NS + feed = etree.Element('rss', version='2.0', nsmap=nsmap ) + feed[:] = rss_feed[:] + channel = feed[0] + + #if self.__itunes_author: + # author = etree.SubElement(channel, '{%s}author' % ITUNES_NS) + # author.text = self.__itunes_author + + # ... + + #if self.__itunes_summary: + # summary = etree.SubElement(channel, '{%s}summary' % ITUNES_NS) + # summary.text = self.__itunes_summary + + return feed + + + def dc_contributor(self, contributor=None, replace=False): + '''Get or set the dc:contributor which is an entity responsible for + making contributions to the resource. + + For more information see: + http://dublincore.org/documents/dcmi-terms/#elements-contributor + + If not set, the value of atom:contributor will be used. But setting this + will on the other hand not set atom:contributor. + + :param contributor: Contributor or list of contributors. + :param replace: Replace alredy set contributors (deault: False). + :returns: List of contributors. + ''' + if not contributor is None: + if not isinstance(contributor, list): + contributor = [contributor] + if replace or not self.__dcelem_contributor: + self.__dcelem_contributor = [] + self.__dcelem_contributor += contributor + return self.__dcelem_contributor + + + def dc_coverage(self, coverage=None, replace=True): + '''Get or set the dc:coverage which indicated the spatial or temporal + topic of the resource, the spatial applicability of the resource, or the + jurisdiction under which the resource is relevant. + + Spatial topic and spatial applicability may be a named place or a + location specified by its geographic coordinates. Temporal topic may be a + named period, date, or date range. A jurisdiction may be a named + administrative entity or a geographic place to which the resource + applies. Recommended best practice is to use a controlled vocabulary such + as the Thesaurus of Geographic Names [TGN]. Where appropriate, named + places or time periods can be used in preference to numeric identifiers + such as sets of coordinates or date ranges. + + References: [TGN] http://www.getty.edu/research/tools/vocabulary/tgn/index.html + + :param coverage: Coverage of the feed. + :param replace: Replace already set coverage (default: True). + :returns: Coverage of the feed. + ''' + if not coverage is None: + if not isinstance(coverage, list): + coverage = [coverage] + if replace or not self.__dcelem_coverage: + self.__dcelem_coverage = [] + self.__dcelem_coverage = coverage + return self.__dcelem_coverage + + + def dc_creator(self, creator=None, replace=False): + '''Get or set the dc:creator which is an entity primarily responsible for + making the resource. + + For more information see: + http://dublincore.org/documents/dcmi-terms/#elements-creator + + If not set, the value of atom:author will be used. But setting this + will on the other hand not set atom:author. + + :param creator: Creator or list of creators. + :param replace: Replace alredy set creators (deault: False). + :returns: List of creators. + ''' + if not creator is None: + if not isinstance(creator, list): + creator = [creator] + if replace or not self.__dcelem_creator: + self.__dcelem_creator = [] + self.__dcelem_creator += creator + return self.__dcelem_creator + + + def dc_date(self, date=None, replace=True): + '''Get or set the dc:date which describes a point or period of time + associated with an event in the lifecycle of the resource. + + For more information see: + http://dublincore.org/documents/dcmi-terms/#elements-date + + If not set, the value of atom:updated will be used. But setting this + will on the other hand not set atom:updated. + + :param date: Date or list of dates. + :param replace: Replace alredy set dates (deault: True). + :returns: List of dates. + ''' + if not date is None: + if not isinstance(date, list): + date = [date] + if replace or not self.__dcelem_date: + self.__dcelem_date = [] + self.__dcelem_date += date + return self.__dcelem_date + + + def dc_description(self, description=None, replace=True): + '''Get or set the dc:description which is an account of the resource. + + For more information see: + http://dublincore.org/documents/dcmi-terms/#elements-description + + If not set, the value of atom:subtitle will be used. But setting this + will on the other hand not set atom:subtitle. + + :param description: Description or list of descriptions. + :param replace: Replace alredy set descriptions (deault: True). + :returns: List of descriptions. + ''' + if not description is None: + if not isinstance(description, list): + description = [description] + if replace or not self.__dcelem_description: + self.__dcelem_description = [] + self.__dcelem_description += description + return self.__dcelem_description + + + def dc_format(self, format=None): + '''Get or set the dc:format which describes the file format, physical + medium, or dimensions of the resource. + + For more information see: + http://dublincore.org/documents/dcmi-terms/#elements-format + + :param format: Format of the resource. + :returns: Format of the resource. + ''' + if not format is None: + self.__dcelem_format = format + return self.__dcelem_format