forked from openlp/openlp
157 lines
5.5 KiB
Python
157 lines
5.5 KiB
Python
# -*- coding: utf-8 -*-
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# vim: autoindent shiftwidth=4 expandtab textwidth=80 tabstop=4 softtabstop=4
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###############################################################################
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# OpenLP - Open Source Lyrics Projection #
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# --------------------------------------------------------------------------- #
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# Copyright (c) 2008-2011 Raoul Snyman #
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# Portions copyright (c) 2008-2011 Tim Bentley, Jonathan Corwin, Michael #
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# Gorven, Scott Guerrieri, Meinert Jordan, Armin Köhler, Andreas Preikschat, #
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# Christian Richter, Philip Ridout, Maikel Stuivenberg, Martin Thompson, Jon #
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# Tibble, Carsten Tinggaard, Frode Woldsund #
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# --------------------------------------------------------------------------- #
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# This program is free software; you can redistribute it and/or modify it #
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# under the terms of the GNU General Public License as published by the Free #
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# Software Foundation; version 2 of the License. #
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# #
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# This program is distributed in the hope that it will be useful, but WITHOUT #
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or #
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for #
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# more details. #
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# #
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# You should have received a copy of the GNU General Public License along #
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# with this program; if not, write to the Free Software Foundation, Inc., 59 #
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# Temple Place, Suite 330, Boston, MA 02111-1307 USA #
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###############################################################################
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"""
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The :mod:`customxmlhandler` module provides the XML functionality for custom
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slides
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The basic XML is of the format::
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<?xml version="1.0" encoding="UTF-8"?>
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<song version="1.0">
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<lyrics language="en">
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<verse type="chorus" label="1">
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<![CDATA[ ... ]]>
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</verse>
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</lyrics>
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</song>
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"""
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import logging
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from xml.dom.minidom import Document
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from xml.etree.ElementTree import dump
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from lxml import etree, objectify
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log = logging.getLogger(__name__)
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class CustomXMLBuilder(object):
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"""
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This class builds the XML used to describe songs.
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"""
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log.info(u'CustomXMLBuilder Loaded')
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def __init__(self):
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"""
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Set up the custom builder.
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"""
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# Create the minidom document
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self.custom_xml = Document()
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def new_document(self):
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"""
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Create a new custom XML document.
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"""
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# Create the <song> base element
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self.song = self.custom_xml.createElement(u'song')
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self.custom_xml.appendChild(self.song)
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self.song.setAttribute(u'version', u'1.0')
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def add_lyrics_to_song(self):
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"""
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Set up and add a ``<lyrics>`` tag which contains the lyrics of the
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custom item.
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"""
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# Create the main <lyrics> element
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self.lyrics = self.custom_xml.createElement(u'lyrics')
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self.lyrics.setAttribute(u'language', u'en')
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self.song.appendChild(self.lyrics)
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def add_verse_to_lyrics(self, type, number, content):
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"""
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Add a verse to the ``<lyrics>`` tag.
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``type``
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A string denoting the type of verse. Possible values are "Chorus",
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"Verse", "Bridge", and "Custom".
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``number``
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An integer denoting the number of the item, for example: verse 1.
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``content``
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The actual text of the verse to be stored.
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"""
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verse = self.custom_xml.createElement(u'verse')
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verse.setAttribute(u'type', type)
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verse.setAttribute(u'label', number)
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self.lyrics.appendChild(verse)
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# add data as a CDATA section to protect the XML from special chars
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cds = self.custom_xml.createCDATASection(content)
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verse.appendChild(cds)
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def _dump_xml(self):
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"""
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Debugging aid to dump XML so that we can see what we have.
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"""
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return self.custom_xml.toprettyxml(indent=u' ')
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def extract_xml(self):
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"""
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Extract our newly created XML custom.
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"""
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return self.custom_xml.toxml(u'utf-8')
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class CustomXMLParser(object):
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"""
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A class to read in and parse a custom's XML.
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"""
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log.info(u'CustomXMLParser Loaded')
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def __init__(self, xml):
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"""
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Set up our custom XML parser.
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``xml``
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The XML of the custom to be parsed.
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"""
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self.custom_xml = None
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if xml[:5] == u'<?xml':
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xml = xml[38:]
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try:
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self.custom_xml = objectify.fromstring(xml)
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except etree.XMLSyntaxError:
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log.exception(u'Invalid xml %s', xml)
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def get_verses(self):
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"""
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Iterates through the verses in the XML and returns a list of verses
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and their attributes.
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"""
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xml_iter = self.custom_xml.getiterator()
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verse_list = []
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for element in xml_iter:
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if element.tag == u'verse':
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if element.text is None:
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element.text = u''
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verse_list.append([element.attrib, unicode(element.text)])
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return verse_list
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def _dump_xml(self):
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"""
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Debugging aid to dump XML so that we can see what we have.
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"""
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return dump(self.custom_xml)
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