ext/xhtml2fo.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 24 Mar 2010 10:23:31 +0100
brancholdstable
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oldstable is now 3.6
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from xml.etree.ElementTree import QName
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from pysixt.standard.xhtml_xslfo.transformer import XHTML2FOTransformer
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from pysixt.utils.xslfo.standard import cm
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from pysixt.utils.xslfo import SimplePageMaster
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from pysixt.standard.xhtml_xslfo.default_styling import default_styles
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from pysixt.standard.xhtml_xslfo import XHTML_NS
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class ReportTransformer(XHTML2FOTransformer):
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    """
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    Class transforming an XHTML input tree into a FO document
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    displaying reports (one report for each <div class="contentmain">
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    element in the input tree.
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    """
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    def __init__(self, section,
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                 page_width=21.0, page_height=29.7,
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                 margin_top=1.0, margin_bottom=1.0,
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                 margin_left=1.0, margin_right=1.0,
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                 header_footer_height=0.75,
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                 standard_font_size=11.0, default_lang=u"fr" ):
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        """
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        Initializes a transformer turning an XHTML input tree
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        containing <div class="contentmain"> elements representing
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        main content sections into a FO output tree displaying the
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        reports.
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        page_width: float - width of the page (in cm)
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        page_height: float - height of the page (in cm)
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        margin_top: float - top margin of the page (in cm)
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        margin_bottom: float - bottom margin of the page (in cm)
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        margin_left: float - left margin of the page (in cm)
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        margin_right: float - right margin of the page (in cm)
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        header_footer_height: float - height of the header or the footer of the
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                              page that the page number (if any) will be
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                              inserted in.
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        standard_font_size: float - standard size of the font (in pt)
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        default_lang: u"" - default language (used for hyphenation)
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        """
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        self.section = section
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        self.page_width = page_width
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        self.page_height = page_height
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        self.page_tmargin = margin_top
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        self.page_bmargin = margin_bottom
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        self.page_lmargin = margin_left
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        self.page_rmargin = margin_right
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        self.hf_height = header_footer_height
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        self.font_size = standard_font_size
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        self.lang = default_lang
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        XHTML2FOTransformer.__init__(self)
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    def define_pagemasters(self):
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        """
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        Defines the page masters for the FO output document.
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        """
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        pm = SimplePageMaster(u"page-report")
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        pm.set_page_dims( self.page_width*cm, self.page_height*cm )
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        pm.set_page_margins({u'top'   : self.page_tmargin*cm,
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                             u'bottom': self.page_bmargin*cm,
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                             u'left'  : self.page_lmargin*cm,
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                             u'right' : self.page_rmargin*cm })
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        pm.add_peripheral_region(u"end", self.hf_height)
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        dims = {}
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        dims[u"bottom"] = self.hf_height + 0.25
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        pm.set_main_region_margins(dims)
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        return [pm]
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    def _visit_report(self, in_elt, _out_elt, params):
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        """
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        Specific visit function for the input <div> elements whose class is
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        "report". The _root_visit method of this class selects these input
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        elements and asks the process of these elements with this specific
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        visit function.
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        """
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        ps = self.create_pagesequence(u"page-report")
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        props = { u"force-page-count": u"no-force",
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                  u"initial-page-number": u"1",
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                  u"format": u"1", }
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        self._output_properties(ps, props)
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        sc = self.create_staticcontent(ps, u"end")
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        sc_bl = self.create_block(sc)
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        attrs = { u"hyphenate": u"false", }
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        attrs[u"font-size"] = u"%.1fpt" % (self.font_size * 0.7)
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        attrs[u"language"] = self.lang
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        attrs[u"text-align"] = u"center"
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        self._output_properties(sc_bl, attrs)
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        sc_bl.text = u"Page" + u" " # ### Should be localised!
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        pn = self.create_pagenumber(sc_bl)
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        pn.tail = u"/"
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        self.create_pagenumbercitation(
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            sc_bl, u"last-block-of-report-%d" % params[u"context_pos"])
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        fl = self.create_flow(ps, u"body")
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        bl = self.create_block(fl)
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        # Sets on the highest block element the properties of the XHTML body
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        # element. These properties (at the least the inheritable ones) will
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        # be inherited by all the future FO elements.
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        bodies = list(self.in_tree.getiterator(QName(XHTML_NS, u"body")))
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        if len(bodies) > 0:
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            attrs = self._extract_properties([bodies[0]])
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        else:
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            attrs = default_styles[u"body"].copy()
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        attrs[u"font-size"] = u"%.1fpt" % self.font_size
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        attrs[u"language"] = self.lang
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        self._output_properties(bl,attrs)
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        # Processes the report content
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        self._copy_text(in_elt, bl)
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        self._process_nodes(in_elt.getchildren(), bl)
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        # Inserts an empty block at the end of the report in order to be able
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        # to compute the last page number of this report.
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        last_bl = self.create_block(bl)
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        props = { u"keep-with-previous": u"always", }
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        props[u"id"] = u"last-block-of-report-%d" % params[u"context_pos"]
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        self._output_properties(last_bl,props)
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    def _root_visit(self):
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        """
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        Visit function called when starting the process of the input tree.
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        """
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        content = [ d for d in self.in_tree.getiterator(QName(XHTML_NS, u"div"))
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                    if d.get(u"id") == self.section ]
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        # Asks the process of the report elements with a specific visit
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        # function
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        self._process_nodes(content, self.fo_root,
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                            with_function=self._visit_report)
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