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odf2xhtml.py

#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright (C) 2006-2007 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):
#
#import pdb
#pdb.set_trace()
import zipfile
import xml.sax
from xml.sax import handler, expatreader
from xml.sax.xmlreader import InputSource
from xml.sax.saxutils import escape, quoteattr
from cStringIO import StringIO

from namespaces import ANIMNS, CHARTNS, CONFIGNS, DCNS, DR3DNS, DRAWNS, FONS, \
  FORMNS, MATHNS, METANS, NUMBERNS, OFFICENS, PRESENTATIONNS, SCRIPTNS, \
  SMILNS, STYLENS, SVGNS, TABLENS, TEXTNS, XLINKNS

# Handling of styles
#
# First there are font face declarations. These set up a font style that will be
# referenced from a text-property. The declaration describes the font making
# it possible for the application to find a similar font should the system not
# have that particular one. The StyleToCSS stores these attributes to be used
# for the CSS2 font declaration.
#
# Then there are default-styles. These set defaults for various style types:
#  "text", "paragraph", "section", "ruby", "table", "table-column", "table-row",
#  "table-cell", "graphic", "presentation", "drawing-page", "chart".
# Since CSS2 can't refer to another style, ODF2XHTML add these to all
# styles unless overridden.
#
# The real styles are declared in the <style:style> element. They have a
# family referring to the default-styles, and may have a parent style.
# 
# Styles have scope. The same name can be used for both paragraph and
# character etc. styles Since CSS2 has no scope we use a prefix. (Not elegant)
# In ODF a style can have a parent, these parents can be chained.

00055 class StyleToCSS:
    """ The purpose of the StyleToCSS class is to contain the rules to convert
        ODF styles to CSS2. Since it needs the generic fonts, it would probably
        make sense to also contain the Styles in a dict as well..
    """

    def __init__(self):
        # Font declarations
        self.fontdict = {}

        # Fill-images from presentations for backgrounds
        self.fillimages = {}

        self.ruleconversions = {
            (DRAWNS,u'fill-image-name'): self.c_drawfillimage,
            (FONS,u"background-color"): self.c_fo,
            (FONS,u"border"): self.c_fo,
            (FONS,u"border-bottom"): self.c_fo,
            (FONS,u"border-left"): self.c_fo,
            (FONS,u"border-right"): self.c_fo,
            (FONS,u"border-top"): self.c_fo,
            (FONS,u"break-after"): self.c_break,
            (FONS,u"break-before"): self.c_break,
            (FONS,u"color"): self.c_fo,
            (FONS,u"font-family"): self.c_fo,
            (FONS,u"font-size"): self.c_fo,
            (FONS,u"font-style"): self.c_fo,
            (FONS,u"font-variant"): self.c_fo,
            (FONS,u"font-weight"): self.c_fo,
            (FONS,u"line-height"): self.c_fo,
            (FONS,u"margin"): self.c_fo,
            (FONS,u"margin-bottom"): self.c_fo,
            (FONS,u"margin-left"): self.c_fo,
            (FONS,u"margin-right"): self.c_fo,
            (FONS,u"margin-top"): self.c_fo,
            (FONS,u"min-height"): self.c_fo,
            (FONS,u"padding"): self.c_fo,
            (FONS,u"padding-bottom"): self.c_fo,
            (FONS,u"padding-left"): self.c_fo,
            (FONS,u"padding-right"): self.c_fo,
            (FONS,u"padding-top"): self.c_fo,
            (FONS,u"page-width"): self.c_page_width,
            (FONS,u"page-height"): self.c_page_height,
            (FONS,u"text-align"): self.c_text_align,
            (FONS,u"text-indent") :self.c_fo,
            (TABLENS,u'border-model') :self.c_border_model,
            (STYLENS,u'column-width') : self.c_width,
            (STYLENS,u"font-name"): self.c_fn,
            (STYLENS,u'horizontal-pos'): self.c_hp,
            (STYLENS,u'text-position'): self.c_text_position,
            (STYLENS,u'text-line-through-style'): self.c_text_line_through_style,
            (STYLENS,u'text-underline-style'): self.c_text_underline_style,
            (STYLENS,u'width') : self.c_width,
            # FIXME Should do style:vertical-pos here
        }

00111     def save_font(self, name, family, generic):
        """ It is possible that the HTML browser doesn't know how to
            show a particular font. Fortunately ODF provides generic fallbacks.
            Unfortunately they are not the same as CSS2.
            CSS2: serif, sans-serif, cursive, fantasy, monospace
            ODF: roman, swiss, modern, decorative, script, system
            This method put the font and fallback into a dictionary
        """
        htmlgeneric = "sans-serif"
        if   generic == "roman": htmlgeneric = "serif"
        elif generic == "swiss": htmlgeneric = "sans-serif"
        elif generic == "modern": htmlgeneric = "monospace"
        elif generic == "decorative": htmlgeneric = "sans-serif"
        elif generic == "script": htmlgeneric = "monospace"
        elif generic == "system": htmlgeneric = "serif"
        self.fontdict[name] = (family, htmlgeneric)

00128     def c_drawfillimage(self, ruleset, sdict, rule, val):
        """ Fill a figure with an image. Since CSS doesn't let you resize images
            this should really be implemented as an absolutely position <img>
            with a width and a height
        """
        sdict['background-image'] = "url('%s')" % self.fillimages[val]

00135     def c_fo(self, ruleset, sdict, rule, val):
        """ XSL formatting attributes """
        selector = rule[1]
        sdict[selector] = val

    def c_break(self, ruleset, sdict, rule, val):
        property = 'page-' + rule[1]
        values = {'auto': 'auto', 'column': 'always', 'page': 'always',
                  'even-page': 'left', 'odd-page': 'right',
                  'inherit': 'inherit'}
        sdict[property] = values.get(val, 'auto')

00147     def c_border_model(self, ruleset, sdict, rule, val):
        """ Convert to CSS2 border model """
        if val == 'collapsing':
            sdict['border-collapse'] ='collapse'
        else:
            sdict['border-collapse'] ='separate'

00154     def c_width(self, ruleset, sdict, rule, val):
        """ Set width of box """
        sdict['width'] = val

00158     def c_text_align(self, ruleset, sdict, rule, align):
        """ Text align """
        if align == "start": align = "left"
        if align == "end": align = "right"
        sdict['text-align'] = align

00164     def c_fn(self, ruleset, sdict, rule, fontstyle):
        """ Generate the CSS font family
            A generic font can be found in two ways. In a <style:font-face>
            element or as a font-family-generic attribute in text-properties.
        """
        generic = ruleset.get((STYLENS,'font-family-generic') )
        if generic is not None:
            self.save_font(fontstyle, fontstyle, generic)
        family, htmlgeneric = self.fontdict.get(fontstyle, (fontstyle, 'serif'))
        sdict['font-family'] = '%s, %s'  % (family, htmlgeneric)

00175     def c_text_position(self, ruleset, sdict, rule, tp):
        """ Text position. This is used e.g. to make superscript and subscript
            This attribute can have one or two values.

            The first value must be present and specifies the vertical
            text position as a percentage that relates to the current font
            height or it takes one of the values sub or super. Negative
            percentages or the sub value place the text below the
            baseline. Positive percentages or the super value place
            the text above the baseline. If sub or super is specified,
            the application can choose an appropriate text position.

            The second value is optional and specifies the font height
            as a percentage that relates to the current font-height. If
            this value is not specified, an appropriate font height is
            used. Although this value may change the font height that
            is displayed, it never changes the current font height that
            is used for additional calculations.
        """
        textpos = tp.split(' ')
        if len(textpos) == 2 and textpos[0] != "0%":
            # Bug in OpenOffice. If vertical-align is 0% - ignore the text size.
            sdict['font-size'] = textpos[1]
        if textpos[0] == "super":
            sdict['vertical-align'] = "33%"
        elif textpos[0] == "sub":
            sdict['vertical-align'] = "-33%"
        else:
            sdict['vertical-align'] = textpos[0]

    def c_hp(self, ruleset, sdict, rule, hpos):
        #FIXME: Frames wrap-style defaults to 'parallel', graphics to 'none'.
        # It is properly set in the parent-styles, but the program doesn't
        # collect the information.
        wrap = ruleset.get((STYLENS,'wrap'),'parallel')
        # Can have: from-left, left, center, right, from-inside, inside, outside
        if hpos == "center":
            sdict['margin-left'] = "auto"
            sdict['margin-right'] = "auto"
#       else:
#           # force it to be *something* then delete it
#           sdict['margin-left'] = sdict['margin-right'] = ''
#           del sdict['margin-left'], sdict['margin-right']

        if hpos in ("right","outside"):
            if wrap in ( "left", "parallel","dynamic"):
                sdict['float'] = "right"
            elif wrap == "run-through":
                sdict['position'] = "absolute" # Simulate run-through
                sdict['top'] = "0"
                sdict['right'] = "0";
            else: # No wrapping
                sdict['margin-left'] = "auto"
                sdict['margin-right'] = "0px"
        elif hpos in ("left", "inside"):
            if wrap in ( "right", "parallel","dynamic"):
                sdict['float'] = "left"
            elif wrap == "run-through":
                sdict['position'] = "absolute" # Simulate run-through
                sdict['top'] = "0"
                sdict['left'] = "0"
            else: # No wrapping
                sdict['margin-left'] = "0px"
                sdict['margin-right'] = "auto"
        elif hpos in ("from-left", "from-inside"):
            if wrap in ( "right", "parallel"):
                sdict['float'] = "left"
            else:
                sdict['position'] = "relative" # No wrapping
                if ruleset.has_key( (SVGNS,'x') ):
                    sdict['left'] = ruleset[(SVGNS,'x')]

00247     def c_page_width(self, ruleset, sdict, rule, val):
        """ Set width of box
            HTML doesn't really have a page-width. It is always 100% of the browser width
        """
        sdict['width'] = val

00253     def c_text_underline_style(self, ruleset, sdict, rule, val):
        """ Set underline decoration
            HTML doesn't really have a page-width. It is always 100% of the browser width
        """
        if val and val != "none":
            sdict['text-decoration'] = "underline"

00260     def c_text_line_through_style(self, ruleset, sdict, rule, val):
        """ Set underline decoration
            HTML doesn't really have a page-width. It is always 100% of the browser width
        """
        if val and val != "none":
            sdict['text-decoration'] = "line-through"

00267     def c_page_height(self, ruleset, sdict, rule, val):
        """ Set height of box """
        sdict['height'] = val

00271     def convert_styles(self, ruleset):
        """ Rule is a tuple of (namespace, name). If the namespace is '' then
            it is already CSS2
        """
        sdict = {}
        for rule,val in ruleset.items():
            if rule[0] == '':
                sdict[rule[1]] = val
                continue
            method = self.ruleconversions.get(rule, None )
            if method:
                method(ruleset, sdict, rule, val)
        return sdict


class TagStack:
    def __init__(self):
        self.stack = []

    def push(self, tag, attrs):
        self.stack.append( (tag, attrs) )

    def pop(self):
        item = self.stack.pop()
        return item

    def stackparent(self):
        item = self.stack[-1]
        return item[1]

    def rfindattr(self, attr):
        """ Find a tag with the given attribute """
        for tag, attrs in self.stack:
            if attrs.has_key(attr):
                return attrs[attr]
        return None
    def count_tags(self, tag):
        c = 0
        for ttag, tattrs in self.stack:
            if ttag == tag: c = c + 1
        return c

special_styles = {
   'S-Emphasis':'em',
   'S-Citation':'cite',
   'S-Strong_20_Emphasis':'strong',
   'S-Variable':'var',
   'S-Definition':'dfn',
   'S-Teletype':'tt',
   'P-Heading_20_1':'h1',
   'P-Heading_20_2':'h2',
   'P-Heading_20_3':'h3',
   'P-Heading_20_4':'h4',
   'P-Heading_20_5':'h5',
   'P-Heading_20_6':'h6',
#  'P-Caption':'caption',
   'P-Addressee':'address',
#  'P-List_20_Heading':'dt',
#  'P-List_20_Contents':'dd',
   'P-Preformatted_20_Text':'pre',
#  'P-Table_20_Heading':'th',
#  'P-Table_20_Contents':'td',
#  'P-Text_20_body':'p'
}

#-----------------------------------------------------------------------------
#
# ODFCONTENTHANDLER
#
#-----------------------------------------------------------------------------
00341 class ODF2XHTML(handler.ContentHandler):
    """ The ODF2XHTML parses an ODF file and produces XHTML"""

    def __init__(self, generate_css=True, embedable=False):
        # Tags
        self.generate_css = generate_css
        self.elements = {
        (DCNS, 'title'): (self.s_processcont, self.e_dc_title),
        (DCNS, 'language'): (self.s_processcont, self.e_dc_contentlanguage),
        (DCNS, 'creator'): (self.s_processcont, self.e_dc_metatag),
        (DCNS, 'description'): (self.s_processcont, self.e_dc_metatag),
        (DCNS, 'date'): (self.s_processcont, self.e_dc_metatag),
        (DRAWNS, 'frame'): (self.s_draw_frame, self.e_draw_frame),
        (DRAWNS, 'image'): (self.s_draw_image, None),
        (DRAWNS, 'fill-image'): (self.s_draw_fill_image, None),
        (DRAWNS, "layer-set"):(self.s_ignorexml, None),
        (DRAWNS, 'page'): (self.s_draw_page, self.e_draw_page),
        (DRAWNS, 'text-box'): (self.s_draw_textbox, self.e_draw_textbox),
        (METANS, 'creation-date'):(self.s_processcont, self.e_dc_metatag),
        (METANS, 'generator'):(self.s_processcont, self.e_dc_metatag),
        (METANS, 'initial-creator'): (self.s_processcont, self.e_dc_metatag),
        (METANS, 'keyword'): (self.s_processcont, self.e_dc_metatag),
        (NUMBERNS, "boolean-style"):(self.s_ignorexml, None),
        (NUMBERNS, "currency-style"):(self.s_ignorexml, None),
        (NUMBERNS, "date-style"):(self.s_ignorexml, None),
        (NUMBERNS, "number-style"):(self.s_ignorexml, None),
        (NUMBERNS, "text-style"):(self.s_ignorexml, None),
        (OFFICENS, "automatic-styles"):(self.s_office_automatic_styles, None),
        (OFFICENS, "document-content"):(self.s_office_document_content, self.e_office_document_content),
        (OFFICENS, "forms"):(self.s_ignorexml, None),
        (OFFICENS, "master-styles"):(self.s_office_master_styles, None),
        (OFFICENS, "meta"):(self.s_ignorecont, None),
        (OFFICENS, "presentation"):(self.s_office_presentation, self.e_office_presentation),
        (OFFICENS, "spreadsheet"):(self.s_office_spreadsheet, self.e_office_spreadsheet),
        (OFFICENS, "styles"):(self.s_office_styles, None),
        (OFFICENS, "text"):(self.s_office_text, self.e_office_text),
        (OFFICENS, "scripts"):(self.s_ignorexml, None),
        (PRESENTATIONNS, "notes"):(self.s_ignorexml, None),
        (STYLENS, "default-style"):(self.s_style_default_style, self.e_style_default_style),
        (STYLENS, "drawing-page-properties"):(self.s_style_handle_properties, None),
        (STYLENS, "font-face"):(self.s_style_font_face, None),
#       (STYLENS, "footer"):(self.s_style_footer, self.e_style_footer),
#       (STYLENS, "footer-style"):(self.s_style_footer_style, None),
        (STYLENS, "graphic-properties"):(self.s_style_handle_properties, None),
        (STYLENS, "handout-master"):(self.s_ignorexml, None),
#       (STYLENS, "header"):(self.s_style_header, self.e_style_header),
#       (STYLENS, "header-footer-properties"):(self.s_style_handle_properties, None),
#       (STYLENS, "header-style"):(self.s_style_header_style, None),
        (STYLENS, "master-page"):(self.s_style_master_page, None),
        (STYLENS, "page-layout-properties"):(self.s_style_handle_properties, None),
#       (STYLENS, "page-layout"):(self.s_style_page_layout, self.e_style_page_layout),
        (STYLENS, "page-layout"):(self.s_ignorexml, None),
        (STYLENS, "paragraph-properties"):(self.s_style_handle_properties, None),
        (STYLENS, "style"):(self.s_style_style, self.e_style_style),
        (STYLENS, "table-cell-properties"):(self.s_style_handle_properties, None),
        (STYLENS, "table-column-properties"):(self.s_style_handle_properties, None),
        (STYLENS, "table-properties"):(self.s_style_handle_properties, None),
        (STYLENS, "text-properties"):(self.s_style_handle_properties, None),
        (SVGNS, 'desc'): (self.s_ignorexml, None),
        (TABLENS, 'covered-table-cell'): (self.s_ignorexml, None),
        (TABLENS, 'table-cell'): (self.s_table_table_cell, self.e_table_table_cell),
        (TABLENS, 'table-column'): (self.s_table_table_column, None),
        (TABLENS, 'table-row'): (self.s_table_table_row, self.e_table_table_row),
        (TABLENS, 'table'): (self.s_table_table, self.e_table_table),
        (TEXTNS, 'a'): (self.s_text_a, self.e_text_a),
        (TEXTNS, "alphabetical-index-source"):(self.s_text_x_source, self.e_text_x_source),
        (TEXTNS, "bibliography-configuration"):(self.s_ignorexml, None),
        (TEXTNS, "bibliography-source"):(self.s_text_x_source, self.e_text_x_source),
        (TEXTNS, 'h'): (self.s_text_h, self.e_text_h),
        (TEXTNS, "illustration-index-source"):(self.s_text_x_source, self.e_text_x_source),
        (TEXTNS, 'line-break'):(self.s_text_line_break, None),
        (TEXTNS, "linenumbering-configuration"):(self.s_ignorexml, None),
        (TEXTNS, "list"):(self.s_text_list, self.e_text_list),
        (TEXTNS, "list-item"):(self.s_text_list_item, self.e_text_list_item),
        (TEXTNS, "list-level-style-bullet"):(self.s_text_list_level_style_bullet, self.e_text_list_level_style_bullet),
        (TEXTNS, "list-level-style-number"):(self.s_text_list_level_style_number, self.e_text_list_level_style_number),
        (TEXTNS, "list-style"):(None, None),
        (TEXTNS, "note"):(self.s_text_note, None),
        (TEXTNS, "note-body"):(self.s_text_note_body, self.e_text_note_body),
        (TEXTNS, "note-citation"):(None, self.e_text_note_citation),
        (TEXTNS, "notes-configuration"):(self.s_ignorexml, None),
        (TEXTNS, "object-index-source"):(self.s_text_x_source, self.e_text_x_source),
        (TEXTNS, 'p'): (self.s_text_p, self.e_text_p),
        (TEXTNS, 's'): (self.s_text_s, None),
        (TEXTNS, 'span'): (self.s_text_span, self.e_text_span),
        (TEXTNS, 'tab'): (self.s_text_tab, None),
        (TEXTNS, "table-index-source"):(self.s_text_x_source, self.e_text_x_source),
        (TEXTNS, "table-of-content-source"):(self.s_text_x_source, self.e_text_x_source),
        (TEXTNS, "user-index-source"):(self.s_text_x_source, self.e_text_x_source),
        }
        if embedable:
            self.elements[(OFFICENS, u"text")] = (None,None)
            self.elements[(OFFICENS, u"spreadsheet")] = (None,None)
            self.elements[(OFFICENS, u"presentation")] = (None,None)
            self.elements[(OFFICENS, u"document-content")] = (None,None)


    def writeout(self, s):
        if s != '':
            self._wfunc(s)

    def writedata(self):
        d = ''.join(self.data)
        if d != '':
            self.writeout(escape(d))

00447     def opentag(self, tag, attrs={}, block=False):
        """ Create an open HTML tag """
        a = []
        for key,val in attrs.items():
            a.append('''%s=%s''' % (key, quoteattr(val)))
        if len(a) == 0:
            self.writeout("<%s>" % tag)
        else:
            self.writeout("<%s %s>" % (tag, " ".join(a)))
        if block == True:
            self.writeout("\n")

    def closetag(self, tag, block=True):
        self.writeout("</%s>" % tag)
        if block == True:
            self.writeout("\n")

    def emptytag(self, tag, attrs={}):
        a = []
        for key,val in attrs.items():
            a.append('''%s=%s''' % (key, quoteattr(val)))
        self.writeout("<%s %s/>\n" % (tag, " ".join(a)))

#--------------------------------------------------
    def characters(self, data):
        if self.processelem and self.processcont:
            self.data.append(data)

    def handle_starttag(self, tag, method, attrs):
        method(tag,attrs)

    def handle_endtag(self, tag, attrs, method):
        method(tag, attrs)

    def startElementNS(self, tag, qname, attrs):
        self.pstack.append( (self.processelem, self.processcont) )
        if self.processelem:
            method = self.elements.get(tag, (None, None) )[0]
            if method:
                self.handle_starttag(tag, method, attrs)
            else:
                self.unknown_starttag(tag,attrs)
        self.tagstack.push( tag, attrs )

    def endElementNS(self, tag, qname):
        stag, attrs = self.tagstack.pop()
        if self.processelem:
            method = self.elements.get(tag, (None, None) )[1]
            if method:
                self.handle_endtag(tag, attrs, method)
            else:
                self.unknown_endtag(tag, attrs)
        self.processelem, self.processcont = self.pstack.pop()

    def unknown_starttag(self, tag, attrs):
        pass

    def unknown_endtag(self, tag, attrs):
        pass

00507     def s_ignorexml(self, tag, attrs):
        """ Ignore this xml element and all children of it
            It will automatically stop ignoring
        """
        self.processelem = False

    def s_ignorecont(self, tag, attrs):
        self.processcont = False

    def s_processcont(self, tag, attrs):
        self.processcont = True

00519     def classname(self, attrs):
        """ Generate a class name from a style name """
        c = attrs[(TEXTNS,'style-name')]
        c = c.replace(".","_")
        return c

    def get_anchor(self, name):
        if not self.anchors.has_key(name):
            self.anchors[name] = "anchor%03d" % (len(self.anchors) + 1)
        return self.anchors.get(name)


#--------------------------------------------------

    def purgedata(self):
        self.data = []

#-----------------------------------------------------------------------------
#
# Handle meta data
#
#-----------------------------------------------------------------------------
00541     def e_dc_title(self, tag, attrs):
        """ Get the title from the meta data and create a HTML <title>
        """
        self.metatags.append('<title>%s</title>\n' % escape(''.join(self.data)))
        self.title = ''.join(self.data)
        self.data = []

00548     def e_dc_metatag(self, tag, attrs):
        """ Any other meta data is added as a <meta> element
        """
        self.metatags.append('<meta name="%s" content=%s/>\n' % (tag[1], quoteattr(''.join(self.data))))
        self.data = []

00554     def e_dc_contentlanguage(self, tag, attrs):
        """ Set the content language. Identifies the targeted audience
        """
        self.metatags.append('<meta http-equiv="content-language" content="%s"/>\n' % ''.join(self.data))
        self.data = []

00560     def s_draw_frame(self, tag, attrs):
        """ A <draw:frame> is made into a <div> in HTML which is then styled
        """
        anchor_type = attrs.get((TEXTNS,'anchor-type'),'char')
        htmltag = 'div'
        name = "G-" + attrs.get( (DRAWNS,'style-name'), "")
        if name == 'G-':
            name = "PR-" + attrs.get( (PRESENTATIONNS,'style-name'), "")
        name = name.replace(".","_")
        if anchor_type == "paragraph":
            style = 'position:relative;'
        elif anchor_type == 'char':
            style = "position:relative;"
        elif anchor_type == 'as-char':
            htmltag = 'div'
            style = ''
        else:
            style = "position: absolute;"
        if attrs.has_key( (SVGNS,"width") ):
            style = style + "width:" + attrs[(SVGNS,"width")] + ";"
        if attrs.has_key( (SVGNS,"height") ):
            style = style + "height:" +  attrs[(SVGNS,"height")] + ";"
        if attrs.has_key( (SVGNS,"x") ):
            style = style + "left:" +  attrs[(SVGNS,"x")] + ";"
        if attrs.has_key( (SVGNS,"y") ):
            style = style + "top:" +  attrs[(SVGNS,"y")] + ";"
        if self.generate_css:
            self.opentag(htmltag, {'class': name, 'style': style})
        else:
            self.opentag(htmltag)

00591     def e_draw_frame(self, tag, attrs):
        """ End the <draw:frame>
        """
        self.closetag('div')

    def s_draw_fill_image(self, tag, attrs):
        name = attrs.get( (DRAWNS,'name'), "NoName")
        imghref = attrs[(XLINKNS,"href")]
        imghref = self.rewritelink(imghref)
        self.cs.fillimages[name] = imghref

00602     def rewritelink(self, imghref):
        """ Intended to be overloaded if you don't store your pictures
            in a Pictures subfolder
        """
        return imghref

00608     def s_draw_image(self, tag, attrs):
        """ A <draw:image> becomes an <img/> element
        """
        parent = self.tagstack.stackparent()
        anchor_type = parent.get((TEXTNS,'anchor-type'))
        imghref = attrs[(XLINKNS,"href")]
        imghref = self.rewritelink(imghref)
        htmlattrs = {'alt':"", 'src':imghref }
        if self.generate_css:
            if anchor_type != "char":
                htmlattrs['style'] = "display: block;"
        self.emptytag('img', htmlattrs)

00621     def s_draw_page(self, tag, attrs):
        """ A <draw:page> is a slide in a presentation. We use a <fieldset> element in HTML.
            Therefore if you convert a ODP file, you get a series of <fieldset>s.
            Override this for your own purpose.
        """
        name = attrs.get( (DRAWNS,'name'), "NoName")
        stylename = attrs.get( (DRAWNS,'style-name'), "")
        stylename = stylename.replace(".","_")
        masterpage = attrs.get( (DRAWNS,'master-page-name'),"")
        masterpage = masterpage.replace(".","_")
        if self.generate_css:
            self.opentag('fieldset', {'class':"DP-%s MP-%s" % (stylename, masterpage) })
        else:
            self.opentag('fieldset')
        self.opentag('legend')
        self.writeout(escape(name))
        self.closetag('legend')

    def e_draw_page(self, tag, attrs):
        self.closetag('fieldset')

    def s_draw_textbox(self, tag, attrs):
        style = ''
        if attrs.has_key( (FONS,"min-height") ):
            style = style + "min-height:" +  attrs[(FONS,"min-height")] + ";"
        self.opentag('div')
#       self.opentag('div', {'style': style})

00649     def e_draw_textbox(self, tag, attrs):
        """ End the <draw:text-box>
        """
        self.closetag('div')

    def html_body(self, tag, attrs):
        self.writedata()
        if self.generate_css:
            self.opentag('style', {'type':"text/css"}, True)
            self.writeout('/*<![CDATA[*/\n')
            self.writeout('\nimg { width: 100%; height: 100%; }\n')
            self.writeout('* { padding: 0; margin: 0;  background-color:white; }\n')
            self.writeout('body { margin: 0 1em; }\n')
            self.writeout('ol, ul { padding-left: 2em; }\n')
            self.generate_stylesheet()
            self.writeout('/*]]>*/\n')
            self.closetag('style')
        self.purgedata()
        self.closetag('head')
        self.opentag('body', block=True)

    def generate_stylesheet(self):
        for name in self.stylestack:
            styles = self.styledict.get(name)
            # Preload with the family's default style
            if styles.has_key('__style-family') and self.styledict.has_key(styles['__style-family']):
                familystyle = self.styledict[styles['__style-family']].copy()
                del styles['__style-family']
                for style, val in styles.items():
                    familystyle[style] = val
                styles = familystyle
            # Resolve the remaining parent styles
            while styles.has_key('__parent-style-name') and self.styledict.has_key(styles['__parent-style-name']):
                parentstyle = self.styledict[styles['__parent-style-name']].copy()
                del styles['__parent-style-name']
                for style, val in styles.items():
                    parentstyle[style] = val
                styles = parentstyle
            self.styledict[name] = styles
        # Write the styles to HTML
        for name in self.stylestack:
            styles = self.styledict.get(name)
            css2 = self.cs.convert_styles(styles)
            self.writeout("%s {\n" % name)
            for style, val in css2.items():
                self.writeout("\t%s: %s;\n" % (style, val) )
            self.writeout("}\n")

    def generate_footnotes(self):
        if self.currentnote == 0:
            return
        if self.generate_css:
            self.opentag('ol', {'style':'border-top: 1px solid black'}, True)
        else:
            self.opentag('ol')
        for key in range(1,self.currentnote+1):
            note = self.notedict[key]
#       for key,note in self.notedict.items():
            self.opentag('li', { 'id':"footnote-%d" % key })
#           self.opentag('sup')
#           self.writeout(escape(note['citation']))
#           self.closetag('sup', False)
            self.writeout(note['body'])
            self.closetag('li')
        self.closetag('ol')

    def s_office_automatic_styles(self, tag, attrs):
        if self.xmlfile == 'styles.xml':
            self.autoprefix = "A"
        else:
            self.autoprefix = ""

00721     def s_office_document_content(self, tag, attrs):
        """ First tag in the content.xml file"""
        self.writeout('<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" ')
        self.writeout('"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">\n')
        self.opentag('html', {'xmlns':"http://www.w3.org/1999/xhtml"}, True)
        self.opentag('head', block=True)
        self.emptytag('meta', { 'http-equiv':"Content-Type", 'content':"text/html;charset=UTF-8"})
        for metaline in self.metatags:
            self.writeout(metaline)

00731     def e_office_document_content(self, tag, attrs):
        """ Last tag """
        self.closetag('html')

00735     def s_office_master_styles(self, tag, attrs):
        """ """

00738     def s_office_presentation(self, tag, attrs):
        """ For some odd reason, OpenOffice Impress doesn't define a default-style
            for the 'paragraph'. We therefore force a standard when we see
            it is a presentation
        """
        self.styledict['p'] = {(FONS,u'font-size'): u"24pt" }
        self.styledict['presentation'] = {(FONS,u'font-size'): u"24pt" }
        self.html_body(tag, attrs)

    def e_office_presentation(self, tag, attrs):
        self.generate_footnotes()
        self.closetag('body')

    def s_office_spreadsheet(self, tag, attrs):
        self.html_body(tag, attrs)

    def e_office_spreadsheet(self, tag, attrs):
        self.generate_footnotes()
        self.closetag('body')

    def s_office_styles(self, tag, attrs):
        self.autoprefix = ""

00761     def s_office_text(self, tag, attrs):
        """ OpenDocument text """
        self.styledict['frame'] = { (STYLENS,'wrap'): u'parallel'}
        self.html_body(tag, attrs)

    def e_office_text(self, tag, attrs):
        self.generate_footnotes()
        self.closetag('body')

00770     def s_style_handle_properties(self, tag, attrs):
        """ Copy all attributes to a struct.
            We will later convert them to CSS2
        """
        if self.currentstyle is None:
            return
        for key,attr in attrs.items():
            self.styledict[self.currentstyle][key] = attr


    familymap = {'frame':'frame', 'paragraph':'p', 'presentation':'presentation',
        'text':'span','section':'div',
        'table':'table','table-cell':'td','table-column':'col',
        'table-row':'tr','graphic':'graphic' }

00785     def s_style_default_style(self, tag, attrs):
        """ A default style is like a style on an HTML tag
        """
        family = attrs[(STYLENS,'family')]
        htmlfamily = self.familymap.get(family,'unknown')
        self.currentstyle = htmlfamily
#       self.stylestack.append(self.currentstyle)
        self.styledict[self.currentstyle] = {}

    def e_style_default_style(self, tag, attrs):
        self.currentstyle = None

00797     def s_style_font_face(self, tag, attrs):
        """ It is possible that the HTML browser doesn't know how to
            show a particular font. Luckily ODF provides generic fallbacks
            Unluckily they are not the same as CSS2.
            CSS2: serif, sans-serif, cursive, fantasy, monospace
            ODF: roman, swiss, modern, decorative, script, system
        """
        name = attrs[(STYLENS,"name")]
        family = attrs[(SVGNS,"font-family")]
        generic = attrs.get( (STYLENS,'font-family-generic'),"" )
        self.cs.save_font(name, family, generic)

    def s_style_footer(self, tag, attrs):
        self.opentag('div', { 'id':"footer" })
        self.purgedata()

    def e_style_footer(self, tag, attrs):
        self.writedata()
        self.closetag('div')
        self.purgedata()

    def s_style_footer_style(self, tag, attrs):
        self.currentstyle = "@print #footer"
        self.stylestack.append(self.currentstyle)
        self.styledict[self.currentstyle] = {}

    def s_style_header(self, tag, attrs):
        self.opentag('div', { 'id':"header" })
        self.purgedata()

    def e_style_header(self, tag, attrs):
        self.writedata()
        self.closetag('div')
        self.purgedata()

    def s_style_header_style(self, tag, attrs):
        self.currentstyle = "@print #header"
        self.stylestack.append(self.currentstyle)
        self.styledict[self.currentstyle] = {}

00837     def s_style_page_layout(self, tag, attrs):
        """ Collect the formatting for the page layout style.
        """
        name = attrs[(STYLENS,'name')]
        name = name.replace(".","_")
        self.currentstyle = "@page " + name
        self.stylestack.append(self.currentstyle)
        self.styledict[self.currentstyle] = {}

00846     def e_style_page_layout(self, tag, attrs):
        """ End this style
        """
        self.currentstyle = None

00851     def s_style_master_page(self, tag, attrs):
        """ Collect the formatting for the page layout style.
        """
        name = attrs[(STYLENS,'name')]
        name = name.replace(".","_")

        self.currentstyle = ".MP-" + name
        self.stylestack.append(self.currentstyle)
        self.styledict[self.currentstyle] = {('','position'):'relative'}
        # Then load the pagelayout style if we find it
        pagelayout = attrs.get( (STYLENS,'page-layout-name'), None)
        if pagelayout:
            pagelayout = ".PL-" + pagelayout
            if self.styledict.has_key( pagelayout ):
                styles = self.styledict[pagelayout]
                for style, val in styles.items():
                    self.styledict[self.currentstyle][style] = val
            else:
                self.styledict[self.currentstyle]['__parent-style-name'] = pagelayout
        self.s_ignorexml(tag, attrs)

    # Short prefixes for class selectors
    familyshort = {'drawing-page':'DP', 'paragraph':'P', 'presentation':'PR',
        'text':'S', 'section':'D',
         'table':'T', 'table-cell':'TD', 'table-column':'TC',
         'table-row':'TR', 'graphic':'G' }

00878     def s_style_style(self, tag, attrs):
        """ Collect the formatting for the style.
            Styles have scope. The same name can be used for both paragraph and
            character styles Since CSS has no scope we use a prefix. (Not elegant)
            In ODF a style can have a parent, these parents can be chained.
            We may not have encountered the parent yet, but if we have, we resolve it.
        """
        name = attrs[(STYLENS,'name')]
        name = name.replace(".","_")
        family = attrs[(STYLENS,'family')]
        htmlfamily = self.familymap.get(family,'unknown')
        sfamily = self.familyshort.get(family,'X')
        name = "%s%s-%s" % (self.autoprefix, sfamily, name)
        parent = attrs.get( (STYLENS,'parent-style-name') )
        self.currentstyle = special_styles.get(name,"."+name)
        self.stylestack.append(self.currentstyle)
        if not self.styledict.has_key(self.currentstyle):
            self.styledict[self.currentstyle] = {}

        self.styledict[self.currentstyle]['__style-family'] = htmlfamily

        # Then load the parent style if we find it
        if parent:
            parent = "%s-%s" % (sfamily, parent)
            parent = special_styles.get(parent, "."+parent)
            if self.styledict.has_key( parent ):
                styles = self.styledict[parent]
                for style, val in styles.items():
                    self.styledict[self.currentstyle][style] = val
            else:
                self.styledict[self.currentstyle]['__parent-style-name'] = parent

00910     def e_style_style(self, tag, attrs):
        """ End this style
        """
        self.currentstyle = None

00915     def s_table_table(self, tag, attrs):
        """ Start a table
        """
        c = attrs.get( (TABLENS,'style-name'), None)
        if c and self.generate_css:
            c = c.replace(".","_")
            self.opentag('table',{ 'class': "T-%s" % c })
        else:
            self.opentag('table')
        self.purgedata()

00926     def e_table_table(self, tag, attrs):
        """ End a table
        """
        self.writedata()
        self.closetag('table')
        self.purgedata()

    def s_table_table_cell(self, tag, attrs):
        #FIXME: number-columns-repeated § 8.1.3
        #repeated = int(attrs.get( (TABLENS,'number-columns-repeated'), 1))
        htmlattrs = {}
        rowspan = attrs.get( (TABLENS,'number-rows-spanned') )
        if rowspan:
            htmlattrs['rowspan'] = rowspan
        colspan = attrs.get( (TABLENS,'number-columns-spanned') )
        if colspan:
            htmlattrs['colspan'] = colspan

        c = attrs.get( (TABLENS,'style-name') )
        if c:
            htmlattrs['class'] = 'TD-%s' % c.replace(".","_")
        self.opentag('td', htmlattrs)
        self.purgedata()

    def e_table_table_cell(self, tag, attrs):
        self.writedata()
        self.closetag('td')
        self.purgedata()

    def s_table_table_column(self, tag, attrs):
        c = attrs.get( (TABLENS,'style-name'), None)
        repeated = int(attrs.get( (TABLENS,'number-columns-repeated'), 1))
        htmlattrs = {}
        if c:
            htmlattrs['class'] = "TC-%s" % c.replace(".","_")
        for x in xrange(repeated):
            self.emptytag('col', htmlattrs)
        self.purgedata()

    def s_table_table_row(self, tag, attrs):
        #FIXME: table:number-rows-repeated
        c = attrs.get( (TABLENS,'style-name'), None)
        htmlattrs = {}
        if c:
            htmlattrs['class'] = "TR-%s" % c.replace(".","_")
        self.opentag('tr', htmlattrs)
        self.purgedata()

    def e_table_table_row(self, tag, attrs):
        self.writedata()
        self.closetag('tr')
        self.purgedata()

00979     def s_text_a(self, tag, attrs):
        """ Anchors start """
        self.writedata()
        href = attrs[(XLINKNS,"href")].split("|")[0]
        if href[0] == "#":
            href = "#" + self.get_anchor(href[1:])
        self.opentag('a', {'href':href})
        self.purgedata()

    def e_text_a(self, tag, attrs):
        self.writedata()
        self.closetag('a', False)
        self.purgedata()

00993     def s_text_h(self, tag, attrs):
        """ Headings start """
        level = int(attrs[(TEXTNS,'outline-level')])
        if level > 6: level = 6 # Heading levels go only to 6 in XHTML
        if level < 1: level = 1
        self.headinglevels[level] = self.headinglevels[level] + 1
        name = self.classname(attrs)
        for x in range(level + 1,10):
            self.headinglevels[x] = 0
        special = special_styles.get("P-"+name)
        if special or not self.generate_css:
            self.opentag('h%s' % level)
        else:
            self.opentag('h%s' % level, {'class':"P-%s" % name })
        self.purgedata()

01009     def e_text_h(self, tag, attrs):
        """ Headings end """
        self.writedata()
        level = int(attrs[(TEXTNS,'outline-level')])
        if level > 6: level = 6 # Heading levels go only to 6 in XHTML
        if level < 1: level = 1
        lev = self.headinglevels[1:level+1]
        outline = '.'.join(map(str,lev) )
        anchor = self.get_anchor("%s.%s" % ( outline, ''.join(self.data)))
        self.opentag('a', {'id': anchor} )
        self.closetag('a', False)
        self.closetag('h%s' % level)
        self.purgedata()

    def s_text_line_break(self, tag, attrs):
        self.writedata()
        self.emptytag('br')
        self.purgedata()

01028     def s_text_list(self, tag, attrs):
        """ To know which level we're at, we have to count the number
            of <text:list> elements on the tagstack.
        """
        name = attrs.get( (TEXTNS,'style-name') )
        if name:
            name = name.replace(".","_")
            level = 1
        else:
            # FIXME: If a list is contained in a table cell or text box,
            # the list level must return to 1, even though the table or
            # textbox itself may be nested within another list.
            level = self.tagstack.count_tags(tag) + 1
            name = self.tagstack.rfindattr( (TEXTNS,'style-name') )
        if self.generate_css:
            self.opentag('%s' % self.listtypes.get(name), {'class':"%s_%d" % (name, level) })
        else:
            self.opentag('%s' % self.listtypes.get(name))
        self.purgedata()

    def e_text_list(self, tag, attrs):
        self.writedata()
        name = attrs.get( (TEXTNS,'style-name') )
        if name:
            name = name.replace(".","_")
            level = 1
        else:
            # FIXME: If a list is contained in a table cell or text box,
            # the list level must return to 1, even though the table or
            # textbox itself may be nested within another list.
            level = self.tagstack.count_tags(tag) + 1
            name = self.tagstack.rfindattr( (TEXTNS,'style-name') )
        self.closetag(self.listtypes.get(name))
        self.purgedata()

    def s_text_list_item(self, tag, attrs):
        self.opentag('li')
        self.purgedata()

    def e_text_list_item(self, tag, attrs):
        self.writedata()
        self.closetag('li')
        self.purgedata()

01072     def s_text_list_level_style_bullet(self, tag, attrs):
        """ CSS doesn't have the ability to set the glyph
            to a particular character, so we just go through
            the available glyphs
        """
        name = self.tagstack.rfindattr( (STYLENS,'name') )
        self.listtypes[name] = 'ul'
        level = attrs[(TEXTNS,'level')]
        self.prevstyle = self.currentstyle
        self.currentstyle = ".%s_%s" % ( name.replace(".","_"), level)
        self.stylestack.append(self.currentstyle)
        self.styledict[self.currentstyle] = {}

        level = int(level)
        listtype = ("square", "disc", "circle")[level % 3]
        self.styledict[self.currentstyle][('','list-style-type')] = listtype

    def e_text_list_level_style_bullet(self, tag, attrs):
        self.currentstyle = self.prevstyle
        del self.prevstyle

    def s_text_list_level_style_number(self, tag, attrs):
        name = self.tagstack.stackparent()[(STYLENS,'name')]
        self.listtypes[name] = 'ol'
        level = attrs[(TEXTNS,'level')]
        num_format = attrs.get( (STYLENS,'name'),"1")
        self.prevstyle = self.currentstyle
        self.currentstyle = ".%s_%s" % ( name.replace(".","_"), level)
        self.stylestack.append(self.currentstyle)
        self.styledict[self.currentstyle] = {}
        if   num_format == "1": listtype = "decimal"
        elif num_format == "I": listtype = "upper-roman"
        elif num_format == "i": listtype = "lower-roman"
        elif num_format == "A": listtype = "upper-alpha"
        elif num_format == "a": listtype = "lower-alpha"
        else: listtype = "decimal"
        self.styledict[self.currentstyle][('','list-style-type')] = listtype

    def e_text_list_level_style_number(self, tag, attrs):
        self.currentstyle = self.prevstyle
        del self.prevstyle

    def s_text_note(self, tag, attrs):
        self.writedata()
        self.purgedata()
        self.currentnote = self.currentnote + 1
        self.notedict[self.currentnote] = {}
        self.notebody = []

    def e_text_note(self, tag, attrs):
        pass

    def collectnote(self,s):
        if s != '':
            self.notebody.append(s)

    def s_text_note_body(self, tag, attrs):
        self._orgwfunc = self._wfunc
        self._wfunc = self.collectnote

    def e_text_note_body(self, tag, attrs):
        self._wfunc = self._orgwfunc
        self.notedict[self.currentnote]['body'] = ''.join(self.notebody)
        self.notebody = ''
        del self._orgwfunc

    def e_text_note_citation(self, tag, attrs):
        mark = ''.join(self.data)
        self.notedict[self.currentnote]['citation'] = mark
        self.opentag('a',{ 'href': "#footnote-%s" % self.currentnote })
        self.opentag('sup')
#        self.writeout( escape(mark) )
        # Since HTML only knows about endnotes, there is too much risk that the
        # marker is reused in the source. Therefore we force numeric markers
        self.writeout(unicode(self.currentnote))
        self.closetag('sup')
        self.closetag('a')

01150     def s_text_p(self, tag, attrs):
        """ Paragraph
        """
        htmlattrs = {}
        specialtag = "p"
        c = attrs.get( (TEXTNS,'style-name'), None)
        if c:
            c = c.replace(".","_")
            specialtag = special_styles.get("P-"+c)
            if specialtag is None:
                specialtag = 'p'
                if self.generate_css:
                    htmlattrs['class'] = "P-%s" % c
        self.opentag(specialtag, htmlattrs)
        self.purgedata()

01166     def e_text_p(self, tag, attrs):
        """ End Paragraph
        """
        specialtag = "p"
        c = attrs.get( (TEXTNS,'style-name'), None)
        if c:
            c = c.replace(".","_")
            specialtag = special_styles.get("P-"+c)
            if specialtag is None:
                specialtag = 'p'
        self.writedata()
        if not self.data:
            # Give substance to empty paragraphs, as rendered by OOo
            self.writeout('&#160;')
        self.closetag(specialtag)
        self.purgedata()

01183     def s_text_s(self, tag, attrs):
        """ Generate a number of spaces. ODF has an element; HTML uses &nbsp;
            We use &#160; so we can send the output through an XML parser if we desire to
        """
        c = attrs.get( (TEXTNS,'c'),"1")
        for x in xrange(int(c)):
            self.writeout('&#160;')

01191     def s_text_span(self, tag, attrs):
        """ The <text:span> element matches the <span> element in HTML. It is
            typically used to properties of the text.
        """
        self.writedata()
        c = attrs.get( (TEXTNS,'style-name'), None)
        htmlattrs = {}
        if c:
            c = c.replace(".","_")
            special = special_styles.get("S-"+c)
            if special is None and self.generate_css:
                htmlattrs['class'] = "S-%s" % c
        self.opentag('span', htmlattrs)
        self.purgedata()

01206     def e_text_span(self, tag, attrs):
        """ End the <text:span> """
        self.writedata()
        self.closetag('span', False)
        self.purgedata()

01212     def s_text_tab(self, tag, attrs):
        """ Move to the next tabstop. We ignore this in HTML
        """
        self.writedata()
        self.writeout(' ')
        self.purgedata()

01219     def s_text_x_source(self, tag, attrs):
        """ Various indexes and tables of contents. We ignore those.
        """
        self.writedata()
        self.purgedata()
        self.s_ignorexml(tag, attrs)

01226     def e_text_x_source(self, tag, attrs):
        """ Various indexes and tables of contents. We ignore those.
        """
        self.writedata()
        self.purgedata()


#-----------------------------------------------------------------------------
#
# Reading the file
#
#-----------------------------------------------------------------------------

    def load(self, odffile):
        self._odffile = odffile

    def parseodf(self):
        self.xmlfile = ''
        self.title = ''
        self.data = []
        self.tagstack = TagStack()
        self.pstack = []
        self.processelem = True
        self.processcont = True
        self.listtypes = {}
        self.headinglevels = [0, 0,0,0,0,0, 0,0,0,0,0] # level 0 to 10
        self.cs = StyleToCSS()
        self.anchors = {}

        # Style declarations
        self.stylestack = []
        self.styledict = {}
        self.currentstyle = None

        # Footnotes and endnotes
        self.notedict = {}
        self.currentnote = 0
        self.notebody = ''

        # Tags from meta.xml
        self.metatags = []

        # Extract the interesting files
        z = zipfile.ZipFile(self._odffile)

        # For some reason Trac has trouble when xml.sax.make_parser() is used.
        # Could it be because PyXML is installed, and therefore a different parser
        # might be chosen? By calling expatreader directly we avoid this issue
        parser = expatreader.create_parser()
        parser.setFeature(handler.feature_namespaces, 1)
        parser.setContentHandler(self)
        parser.setErrorHandler(handler.ErrorHandler())
        inpsrc = InputSource()

        for xmlfile in ('meta.xml', 'styles.xml', 'content.xml'):
            self.xmlfile = xmlfile
            content = z.read(xmlfile)
            inpsrc.setByteStream(StringIO(content))
            parser.parse(inpsrc)
        z.close()

01287     def odf2xhtml(self, odffile):
        """ Load a file and return XHTML
        """
        self.load(odffile)
        return self.xhtml()

    def _wlines(self,s):
        if s != '': self.lines.append(s)

    def xhtml(self):
        self.lines = []
        self._wfunc = self._wlines
        self.parseodf()
        return ''.join(self.lines)

    def _writecss(self, s):
        if s != '': self._csslines.append(s)

    def _writenothing(self, s):
        pass

    def css(self):
        self._wfunc = self._writenothing
        self.parseodf()
        self._csslines = []
        self._wfunc = self._writecss
        self.generate_stylesheet()
        res = ''.join(self._csslines)
        del self._csslines
        return res

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