# -*- coding: utf-8 -*-
# Copyright (C) 2006-2010 Søren Roug, European Environment Agency
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
#
# Contributor(s):
#

__doc__="""Use OpenDocument to generate your documents."""

import zipfile, time, sys, mimetypes, copy
from cStringIO import StringIO
from namespaces import *
import manifest, meta
from office import *
import element
from attrconverters import make_NCName
from xml.sax.xmlreader import InputSource
from odfmanifest import manifestlist

__version__= TOOLSVERSION

_XMLPROLOGUE = u"<?xml version='1.0' encoding='UTF-8'?>\n"

UNIXPERMS = 0100644 << 16L  # -rw-r--r--

IS_FILENAME = 0
IS_IMAGE = 1
# We need at least Python 2.2
assert sys.version_info[0]>=2 and sys.version_info[1] >= 2

#sys.setrecursionlimit(100)
#The recursion limit is set conservative so mistakes like
# s=content() s.addElement(s) won't eat up too much processor time.

odmimetypes = {
 'application/vnd.oasis.opendocument.text':                  '.odt',
 'application/vnd.oasis.opendocument.text-template':         '.ott',
 'application/vnd.oasis.opendocument.graphics':              '.odg',
 'application/vnd.oasis.opendocument.graphics-template':     '.otg',
 'application/vnd.oasis.opendocument.presentation':          '.odp',
 'application/vnd.oasis.opendocument.presentation-template': '.otp',
 'application/vnd.oasis.opendocument.spreadsheet':           '.ods',
 'application/vnd.oasis.opendocument.spreadsheet-template':  '.ots',
 'application/vnd.oasis.opendocument.chart':                 '.odc',
 'application/vnd.oasis.opendocument.chart-template':        '.otc',
 'application/vnd.oasis.opendocument.image':                 '.odi',
 'application/vnd.oasis.opendocument.image-template':        '.oti',
 'application/vnd.oasis.opendocument.formula':               '.odf',
 'application/vnd.oasis.opendocument.formula-template':      '.otf',
 'application/vnd.oasis.opendocument.text-master':           '.odm',
 'application/vnd.oasis.opendocument.text-web':              '.oth',
}

class OpaqueObject:
    def __init__(self, filename, mediatype, content=None):
       self.mediatype = mediatype
       self.filename = filename
       self.content = content

class OpenDocument:
    """ A class to hold the content of an OpenDocument document
        Use the xml method to write the XML
        source to the screen or to a file
        d = OpenDocument(mimetype)
        fd.write(d.xml())
    """
    thumbnail = None

    def __init__(self, mimetype, add_generator=True):
        self.mimetype = mimetype
        self.childobjects = []
        self._extra = []
        self.folder = "" # Always empty for toplevel documents
        self.topnode = Document(mimetype=self.mimetype)
        self.topnode.ownerDocument = self

        self.clear_caches()

        self.Pictures = {}
        self.meta = Meta()
        self.topnode.addElement(self.meta)
        if add_generator:
            self.meta.addElement(meta.Generator(text=TOOLSVERSION))
        self.scripts = Scripts()
        self.topnode.addElement(self.scripts)
        self.fontfacedecls = FontFaceDecls()
        self.topnode.addElement(self.fontfacedecls)
        self.settings = Settings()
        self.topnode.addElement(self.settings)
        self.styles = Styles()
        self.topnode.addElement(self.styles)
        self.automaticstyles = AutomaticStyles()
        self.topnode.addElement(self.automaticstyles)
        self.masterstyles = MasterStyles()
        self.topnode.addElement(self.masterstyles)
        self.body = Body()
        self.topnode.addElement(self.body)

    def rebuild_caches(self, node=None):
        if node is None: node = self.topnode
        self.build_caches(node)
        for e in node.childNodes:
            if e.nodeType == element.Node.ELEMENT_NODE:
                self.rebuild_caches(e)

    def clear_caches(self):
        self.element_dict = {}
        self._styles_dict = {}
        self._styles_ooo_fix = {}

    def build_caches(self, element):
        """ Called from element.py
        """
        if not self.element_dict.has_key(element.qname):
            self.element_dict[element.qname] = []
        self.element_dict[element.qname].append(element)
        if element.qname == (STYLENS, u'style'):
            self.__register_stylename(element) # Add to style dictionary
        styleref = element.getAttrNS(TEXTNS,u'style-name')
        if styleref is not None and self._styles_ooo_fix.has_key(styleref):
            element.setAttrNS(TEXTNS,u'style-name', self._styles_ooo_fix[styleref])

    def __register_stylename(self, element):
        ''' Register a style. But there are three style dictionaries:
            office:styles, office:automatic-styles and office:master-styles
            Chapter 14
        '''
        name = element.getAttrNS(STYLENS, u'name')
        if name is None:
            return
        if element.parentNode.qname in ((OFFICENS,u'styles'), (OFFICENS,u'automatic-styles')):
            if self._styles_dict.has_key(name):
                newname = 'M'+name # Rename style
                self._styles_ooo_fix[name] = newname
                # From here on all references to the old name will refer to the new one
                name = newname
                element.setAttrNS(STYLENS, u'name', name)
            self._styles_dict[name] = element

    def toXml(self, filename=''):
        xml=StringIO()
        xml.write(_XMLPROLOGUE)
        self.body.toXml(0, xml)
        if not filename:
            return xml.getvalue()
        else:
            f=file(filename,'w')
            f.write(xml.getvalue())
            f.close()

    def xml(self):
        """ Generates the full document as an XML file
            Always written as a bytestream in UTF-8 encoding
        """
        self.__replaceGenerator()
        xml=StringIO()
        xml.write(_XMLPROLOGUE)
        self.topnode.toXml(0, xml)
        return xml.getvalue()


    def contentxml(self):
        """ Generates the content.xml file
            Always written as a bytestream in UTF-8 encoding
        """
        xml=StringIO()
        xml.write(_XMLPROLOGUE)
        x = DocumentContent()
        x.write_open_tag(0, xml)
        if self.scripts.hasChildNodes():
            self.scripts.toXml(1, xml)
        if self.fontfacedecls.hasChildNodes():
            self.fontfacedecls.toXml(1, xml)
        a = AutomaticStyles()
        stylelist = self._used_auto_styles([self.styles, self.automaticstyles, self.body])
        if len(stylelist) > 0:
            a.write_open_tag(1, xml)
            for s in stylelist:
                s.toXml(2, xml)
            a.write_close_tag(1, xml)
        else:
            a.toXml(1, xml)
        self.body.toXml(1, xml)
        x.write_close_tag(0, xml)
        return xml.getvalue()

    def __manifestxml(self):
        """ Generates the manifest.xml file
            The self.manifest isn't avaible unless the document is being saved
        """
        xml=StringIO()
        xml.write(_XMLPROLOGUE)
        self.manifest.toXml(0,xml)
        return xml.getvalue()

    def metaxml(self):
        """ Generates the meta.xml file """
        self.__replaceGenerator()
        x = DocumentMeta()
        x.addElement(self.meta)
        xml=StringIO()
        xml.write(_XMLPROLOGUE)
        x.toXml(0,xml)
        return xml.getvalue()

    def settingsxml(self):
        """ Generates the settings.xml file """
        x = DocumentSettings()
        x.addElement(self.settings)
        xml=StringIO()
        xml.write(_XMLPROLOGUE)
        x.toXml(0,xml)
        return xml.getvalue()

    def _parseoneelement(self, top, stylenamelist):
        """ Finds references to style objects in master-styles
            and add the style name to the style list if not already there.
            Recursive
        """
        for e in top.childNodes:
            if e.nodeType == element.Node.ELEMENT_NODE:
                for styleref in (
                        (CHARTNS,u'style-name'),
                        (DRAWNS,u'style-name'),
                        (DRAWNS,u'text-style-name'),
                        (PRESENTATIONNS,u'style-name'),
                        (STYLENS,u'data-style-name'),
                        (STYLENS,u'list-style-name'),
                        (STYLENS,u'page-layout-name'),
                        (STYLENS,u'style-name'),
                        (TABLENS,u'default-cell-style-name'),
                        (TABLENS,u'style-name'),
                        (TEXTNS,u'style-name') ):
                    if e.getAttrNS(styleref[0],styleref[1]):
                        stylename = e.getAttrNS(styleref[0],styleref[1])
                        if stylename not in stylenamelist:
                            stylenamelist.append(stylename)
                stylenamelist = self._parseoneelement(e, stylenamelist)
        return stylenamelist

    def _used_auto_styles(self, segments):
        """ Loop through the masterstyles elements, and find the automatic
            styles that are used. These will be added to the automatic-styles
            element in styles.xml
        """
        stylenamelist = []
        for top in segments:
            stylenamelist = self._parseoneelement(top, stylenamelist)
        stylelist = []
        for e in self.automaticstyles.childNodes:
            if e.getAttrNS(STYLENS,u'name') in stylenamelist:
                stylelist.append(e)
        return stylelist

    def stylesxml(self):
        """ Generates the styles.xml file """
        xml=StringIO()
        xml.write(_XMLPROLOGUE)
        x = DocumentStyles()
        x.write_open_tag(0, xml)
        if self.fontfacedecls.hasChildNodes():
            self.fontfacedecls.toXml(1, xml)
        self.styles.toXml(1, xml)
        a = AutomaticStyles()
        a.write_open_tag(1, xml)
        for s in self._used_auto_styles([self.masterstyles]):
            s.toXml(2, xml)
        a.write_close_tag(1, xml)
        if self.masterstyles.hasChildNodes():
            self.masterstyles.toXml(1, xml)
        x.write_close_tag(0, xml)
        return xml.getvalue()

    def addPicture(self, filename, mediatype=None, content=None):
        """ Add a picture
            It uses the same convention as OOo, in that it saves the picture in
            the zipfile in the subdirectory 'Pictures'
            If passed a file ptr, mediatype must be set
        """
        if content is None:
            if mediatype is None:
                mediatype, encoding = mimetypes.guess_type(filename)
            if mediatype is None:
                mediatype = ''
                try: ext = filename[filename.rindex('.'):]
                except: ext=''
            else:
                ext = mimetypes.guess_extension(mediatype)
            manifestfn = "Pictures/%0.0f%s" % ((time.time()*10000000000), ext)
            self.Pictures[manifestfn] = (IS_FILENAME, filename, mediatype)
        else:
            manifestfn = filename
            self.Pictures[manifestfn] = (IS_IMAGE, content, mediatype)
        return manifestfn

    def addPictureFromFile(self, filename, mediatype=None):
        """ Add a picture
            It uses the same convention as OOo, in that it saves the picture in
            the zipfile in the subdirectory 'Pictures'.
            If mediatype is not given, it will be guessed from the filename
            extension.
        """
        if mediatype is None:
            mediatype, encoding = mimetypes.guess_type(filename)
        if mediatype is None:
            mediatype = ''
            try: ext = filename[filename.rindex('.'):]
            except ValueError: ext=''
        else:
            ext = mimetypes.guess_extension(mediatype)
        manifestfn = "Pictures/%0.0f%s" % ((time.time()*10000000000), ext)
        self.Pictures[manifestfn] = (IS_FILENAME, filename, mediatype)
        return manifestfn

    def addPictureFromString(self, content, mediatype):
        """ Add a picture
            It uses the same convention as OOo, in that it saves the picture in
            the zipfile in the subdirectory 'Pictures'. The content variable
            is a string that contains the binary image data. The mediatype
            indicates the image format.
        """
        ext = mimetypes.guess_extension(mediatype)
        manifestfn = "Pictures/%0.0f%s" % ((time.time()*10000000000), ext)
        self.Pictures[manifestfn] = (IS_IMAGE, content, mediatype)
        return manifestfn

    def addThumbnail(self, filecontent=None):
        """ Add a fixed thumbnail
            The thumbnail in the library is big, so this is pretty useless.
        """
        if filecontent is None:
            import thumbnail
            self.thumbnail = thumbnail.thumbnail()
        else:
            self.thumbnail = filecontent

    def addObject(self, document, objectname=None):
        """ Adds an object (subdocument). The object must be an OpenDocument class
            The return value will be the folder in the zipfile the object is stored in
        """
        self.childobjects.append(document)
        if objectname is None:
            document.folder = "%s/Object %d" % (self.folder, len(self.childobjects))
        else:
            document.folder = objectname
        return ".%s" % document.folder

    def _savePictures(self, object, folder):
        hasPictures = False
        for arcname, picturerec in object.Pictures.items():
            what_it_is, fileobj, mediatype = picturerec
            self.manifest.addElement(manifest.FileEntry(fullpath="%s%s" % ( folder ,arcname), mediatype=mediatype))
            hasPictures = True
            if what_it_is == IS_FILENAME:
                self._z.write(fileobj, arcname, zipfile.ZIP_STORED)
            else:
                zi = zipfile.ZipInfo(str(arcname), self._now)
                zi.compress_type = zipfile.ZIP_STORED
                zi.external_attr = UNIXPERMS
                self._z.writestr(zi, fileobj)
        # According to section 17.7.3 in ODF 1.1, the pictures folder should not have a manifest entry
#       if hasPictures:
#           self.manifest.addElement(manifest.FileEntry(fullpath="%sPictures/" % folder, mediatype=""))
        # Look in subobjects
        subobjectnum = 1
        for subobject in object.childobjects:
            self._savePictures(subobject,'%sObject %d/' % (folder, subobjectnum))
            subobjectnum += 1

    def __replaceGenerator(self):
        """ Section 3.1.1: The application MUST NOT export the original identifier
            belonging to the application that created the document.
        """
        for m in self.meta.childNodes[:]:
            if m.qname == (METANS, u'generator'):
                self.meta.removeChild(m)
        self.meta.addElement(meta.Generator(text=TOOLSVERSION))

    def save(self, outputfile, addsuffix=False):
        """ Save the document under the filename.
            If the filename is '-' then save to stdout
        """
        if outputfile == '-':
            outputfp = zipfile.ZipFile(sys.stdout,"w")
        else:
            if addsuffix:
                outputfile = outputfile + odmimetypes.get(self.mimetype,'.xxx')
            outputfp = zipfile.ZipFile(outputfile, "w")
        self.__zipwrite(outputfp)
        outputfp.close()

    def write(self, outputfp):
        """ User API to write the ODF file to an open file descriptor
            Writes the ZIP format
        """
        zipoutputfp = zipfile.ZipFile(outputfp,"w")
        self.__zipwrite(zipoutputfp)

    def __zipwrite(self, outputfp):
        """ Write the document to an open file pointer
            This is where the real work is done
        """
        self._z = outputfp
        self._now = time.localtime()[:6]
        self.manifest = manifest.Manifest()

        # Write mimetype
        zi = zipfile.ZipInfo('mimetype', self._now)
        zi.compress_type = zipfile.ZIP_STORED
        zi.external_attr = UNIXPERMS
        self._z.writestr(zi, self.mimetype)

        self._saveXmlObjects(self,"")

        # Write pictures
        self._savePictures(self,"")

        # Write the thumbnail
        if self.thumbnail is not None:
            self.manifest.addElement(manifest.FileEntry(fullpath="Thumbnails/", mediatype=''))
            self.manifest.addElement(manifest.FileEntry(fullpath="Thumbnails/thumbnail.png", mediatype=''))
            zi = zipfile.ZipInfo("Thumbnails/thumbnail.png", self._now)
            zi.compress_type = zipfile.ZIP_DEFLATED
            zi.external_attr = UNIXPERMS
            self._z.writestr(zi, self.thumbnail)

        # Write any extra files
        for op in self._extra:
            if op.filename == "META-INF/documentsignatures.xml": continue # Don't save signatures
            self.manifest.addElement(manifest.FileEntry(fullpath=op.filename, mediatype=op.mediatype))
            zi = zipfile.ZipInfo(op.filename.encode('utf-8'), self._now)
            zi.compress_type = zipfile.ZIP_DEFLATED
            zi.external_attr = UNIXPERMS
            if op.content is not None:
                self._z.writestr(zi, op.content)
        # Write manifest
        zi = zipfile.ZipInfo("META-INF/manifest.xml", self._now)
        zi.compress_type = zipfile.ZIP_DEFLATED
        zi.external_attr = UNIXPERMS
        self._z.writestr(zi, self.__manifestxml() )
        del self._z
        del self._now
        del self.manifest


    def _saveXmlObjects(self, object, folder):
        if self == object:
            self.manifest.addElement(manifest.FileEntry(fullpath="/", mediatype=object.mimetype))
        else:
            self.manifest.addElement(manifest.FileEntry(fullpath=folder, mediatype=object.mimetype))
        # Write styles
        self.manifest.addElement(manifest.FileEntry(fullpath="%sstyles.xml" % folder, mediatype="text/xml"))
        zi = zipfile.ZipInfo("%sstyles.xml" % folder, self._now)
        zi.compress_type = zipfile.ZIP_DEFLATED
        zi.external_attr = UNIXPERMS
        self._z.writestr(zi, object.stylesxml() )

        # Write content
        self.manifest.addElement(manifest.FileEntry(fullpath="%scontent.xml" % folder, mediatype="text/xml"))
        zi = zipfile.ZipInfo("%scontent.xml" % folder, self._now)
        zi.compress_type = zipfile.ZIP_DEFLATED
        zi.external_attr = UNIXPERMS
        self._z.writestr(zi, object.contentxml() )

        # Write settings
        if object.settings.hasChildNodes():
            self.manifest.addElement(manifest.FileEntry(fullpath="%ssettings.xml" % folder, mediatype="text/xml"))
            zi = zipfile.ZipInfo("%ssettings.xml" % folder, self._now)
            zi.compress_type = zipfile.ZIP_DEFLATED
            zi.external_attr = UNIXPERMS
            self._z.writestr(zi, object.settingsxml() )

        # Write meta
        if self == object:
            self.manifest.addElement(manifest.FileEntry(fullpath="meta.xml", mediatype="text/xml"))
            zi = zipfile.ZipInfo("meta.xml", self._now)
            zi.compress_type = zipfile.ZIP_DEFLATED
            zi.external_attr = UNIXPERMS
            self._z.writestr(zi, object.metaxml() )

        # Write subobjects
        subobjectnum = 1
        for subobject in object.childobjects:
            self._saveXmlObjects(subobject, '%sObject %d/' % (folder, subobjectnum))
            subobjectnum += 1

# Document's DOM methods
    def createElement(self, element):
        """ Inconvenient interface to create an element, but follows XML-DOM.
            Does not allow attributes as argument, therefore can't check grammar.
        """
        return element(check_grammar=False)

    def createTextNode(self, data):
        """ Method to create a text node """
        return element.Text(data)

    def createCDATASection(self, data):
        """ Method to create a CDATA section """
        return element.CDATASection(cdata)

    def getMediaType(self):
        """ Returns the media type """
        return self.mimetype

    def getStyleByName(self, name):
        """ Finds a style object based on the name """
        ncname = make_NCName(name)
        if self._styles_dict == {}:
            self.rebuild_caches()
        return self._styles_dict.get(ncname, None)

    def getElementsByType(self, element):
        """ Gets elements based on the type, which is function from text.py, draw.py etc. """
        obj = element(check_grammar=False)
        if self.element_dict == {}:
            self.rebuild_caches()
        return self.element_dict.get(obj.qname, [])

# Convenience functions
def OpenDocumentChart():
    """ Creates a chart document """
    doc = OpenDocument('application/vnd.oasis.opendocument.chart')
    doc.chart = Chart()
    doc.body.addElement(doc.chart)
    return doc

def OpenDocumentDrawing():
    """ Creates a drawing document """
    doc = OpenDocument('application/vnd.oasis.opendocument.graphics')
    doc.drawing = Drawing()
    doc.body.addElement(doc.drawing)
    return doc

def OpenDocumentImage():
    """ Creates an image document """
    doc = OpenDocument('application/vnd.oasis.opendocument.image')
    doc.image = Image()
    doc.body.addElement(doc.image)
    return doc

def OpenDocumentPresentation():
    """ Creates a presentation document """
    doc = OpenDocument('application/vnd.oasis.opendocument.presentation')
    doc.presentation = Presentation()
    doc.body.addElement(doc.presentation)
    return doc

def OpenDocumentSpreadsheet():
    """ Creates a spreadsheet document """
    doc = OpenDocument('application/vnd.oasis.opendocument.spreadsheet')
    doc.spreadsheet = Spreadsheet()
    doc.body.addElement(doc.spreadsheet)
    return doc

def OpenDocumentText():
    """ Creates a text document """
    doc = OpenDocument('application/vnd.oasis.opendocument.text')
    doc.text = Text()
    doc.body.addElement(doc.text)
    return doc

def OpenDocumentTextMaster():
    """ Creates a text master document """
    doc = OpenDocument('application/vnd.oasis.opendocument.text-master')
    doc.text = Text()
    doc.body.addElement(doc.text)
    return doc

def __loadxmlparts(z, manifest, doc, objectpath):
    from load import LoadParser
    from xml.sax import make_parser, handler

    for xmlfile in (objectpath+'settings.xml', objectpath+'meta.xml', objectpath+'content.xml', objectpath+'styles.xml'):
        if not manifest.has_key(xmlfile):
            continue
        try:
            xmlpart = z.read(xmlfile)
            doc._parsing = xmlfile

            parser = make_parser()
            parser.setFeature(handler.feature_namespaces, 1)
            parser.setContentHandler(LoadParser(doc))
            parser.setErrorHandler(handler.ErrorHandler())

            inpsrc = InputSource()
            inpsrc.setByteStream(StringIO(xmlpart))
            parser.setFeature(handler.feature_external_ges, False)  # Changed by Kovid to ignore external DTDs
            parser.parse(inpsrc)
            del doc._parsing
        except KeyError, v: pass

def load(odffile):
    """ Load an ODF file into memory
        Returns a reference to the structure
    """
    z = zipfile.ZipFile(odffile)
    try:
        mimetype = z.read('mimetype')
    except KeyError:  # Added by Kovid to handle malformed odt files
        mimetype = 'application/vnd.oasis.opendocument.text'
    doc = OpenDocument(mimetype, add_generator=False)

    # Look in the manifest file to see if which of the four files there are
    manifestpart = z.read('META-INF/manifest.xml')
    manifest =  manifestlist(manifestpart)
    __loadxmlparts(z, manifest, doc, '')
    for mentry,mvalue in manifest.items():
        if mentry[:9] == "Pictures/" and len(mentry) > 9:
            doc.addPicture(mvalue['full-path'], mvalue['media-type'], z.read(mentry))
        elif mentry == "Thumbnails/thumbnail.png":
            doc.addThumbnail(z.read(mentry))
        elif mentry in ('settings.xml', 'meta.xml', 'content.xml', 'styles.xml'):
            pass
        # Load subobjects into structure
        elif mentry[:7] == "Object " and len(mentry) < 11 and mentry[-1] == "/":
            subdoc = OpenDocument(mvalue['media-type'], add_generator=False)
            doc.addObject(subdoc, "/" + mentry[:-1])
            __loadxmlparts(z, manifest, subdoc, mentry)
        elif mentry[:7] == "Object ":
            pass # Don't load subobjects as opaque objects
        else:
            if mvalue['full-path'][-1] == '/':
                doc._extra.append(OpaqueObject(mvalue['full-path'], mvalue['media-type'], None))
            else:
                doc._extra.append(OpaqueObject(mvalue['full-path'], mvalue['media-type'], z.read(mentry)))
            # Add the SUN junk here to the struct somewhere
            # It is cached data, so it can be out-of-date
    z.close()
    b = doc.getElementsByType(Body)
    if mimetype[:39] == 'application/vnd.oasis.opendocument.text':
        doc.text = b[0].firstChild
    elif mimetype[:43] == 'application/vnd.oasis.opendocument.graphics':
        doc.graphics = b[0].firstChild
    elif mimetype[:47] == 'application/vnd.oasis.opendocument.presentation':
        doc.presentation = b[0].firstChild
    elif mimetype[:46] == 'application/vnd.oasis.opendocument.spreadsheet':
        doc.spreadsheet = b[0].firstChild
    elif mimetype[:40] == 'application/vnd.oasis.opendocument.chart':
        doc.chart = b[0].firstChild
    elif mimetype[:40] == 'application/vnd.oasis.opendocument.image':
        doc.image = b[0].firstChild
    elif mimetype[:42] == 'application/vnd.oasis.opendocument.formula':
        doc.formula = b[0].firstChild
    return doc

# vim: set expandtab sw=4 :
