annotate env/lib/python3.9/site-packages/docutils/writers/latex2e/__init__.py @ 0:4f3585e2f14b draft default tip

"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"

# .. coding: utf-8
# $Id: __init__.py 8413 2019-11-13 13:45:43Z milde $
# Author: Engelbert Gruber, Günter Milde
# Maintainer: [e-mail]
# Copyright: This module has been placed in the public domain.

"""LaTeX2e document tree Writer."""

__docformat__ = 'reStructuredText'

# code contributions from several people included, thanks to all.
# some named: David Abrahams, Julien Letessier, Lele Gaifax, and others.
#
# convention deactivate code by two # i.e. ##.

import sys
import os
import re
import string

try:
    import roman
except ImportError:
    import docutils.utils.roman as roman

from docutils import frontend, nodes, languages, writers, utils, io
from docutils.utils.error_reporting import SafeString
from docutils.transforms import writer_aux
from docutils.utils.math import pick_math_environment, unichar2tex

if sys.version_info >= (3, 0):
    from urllib.request import url2pathname
else:
    from urllib import url2pathname

if sys.version_info >= (3, 0):
    unicode = str  # noqa


class Writer(writers.Writer):

    supported = ('latex', 'latex2e')
    """Formats this writer supports."""

    default_template = 'default.tex'
    default_template_path = os.path.dirname(os.path.abspath(__file__))
    default_preamble = '\n'.join([r'% PDF Standard Fonts',
                                  r'\usepackage{mathptmx} % Times',
                                  r'\usepackage[scaled=.90]{helvet}',
                                  r'\usepackage{courier}'])
    table_style_values = ('standard', 'booktabs', 'nolines', 'borderless',
                          'colwidths-auto', 'colwidths-given')

    settings_spec = (
        'LaTeX-Specific Options',
        None,
        (('Specify LaTeX documentclass.  Default: "article".',
          ['--documentclass'],
          {'default': 'article', }),
         ('Specify document options.  Multiple options can be given, '
          'separated by commas.  Default: "a4paper".',
          ['--documentoptions'],
          {'default': 'a4paper', }),
         ('Format for footnote references: one of "superscript" or '
          '"brackets".  Default: "superscript".',
          ['--footnote-references'],
          {'choices': ['superscript', 'brackets'], 'default': 'superscript',
           'metavar': '<format>',
           'overrides': 'trim_footnote_reference_space'}),
         ('Use \\cite command for citations. (future default)',
          ['--use-latex-citations'],
          {'default': False, 'action': 'store_true',
           'validator': frontend.validate_boolean}),
         ('Use figure floats for citations '
          '(might get mixed with real figures). (current default)',
          ['--figure-citations'],
          {'dest': 'use_latex_citations', 'action': 'store_false',
           'validator': frontend.validate_boolean}),
         ('Format for block quote attributions: one of "dash" (em-dash '
          'prefix), "parentheses"/"parens", or "none".  Default: "dash".',
          ['--attribution'],
          {'choices': ['dash', 'parentheses', 'parens', 'none'],
           'default': 'dash', 'metavar': '<format>'}),
         ('Specify LaTeX packages/stylesheets. '
          'A style is referenced with "\\usepackage" if extension is '
          '".sty" or omitted and with "\\input" else. '
          ' Overrides previous --stylesheet and --stylesheet-path settings.',
          ['--stylesheet'],
          {'default': '', 'metavar': '<file[,file,...]>',
           'overrides': 'stylesheet_path',
           'validator': frontend.validate_comma_separated_list}),
         ('Comma separated list of LaTeX packages/stylesheets. '
          'Relative paths are expanded if a matching file is found in '
          'the --stylesheet-dirs. With --link-stylesheet, '
          'the path is rewritten relative to the output *.tex file. ',
          ['--stylesheet-path'],
          {'metavar': '<file[,file,...]>', 'overrides': 'stylesheet',
           'validator': frontend.validate_comma_separated_list}),
         ('Link to the stylesheet(s) in the output file. (default)',
          ['--link-stylesheet'],
          {'dest': 'embed_stylesheet', 'action': 'store_false'}),
         ('Embed the stylesheet(s) in the output file. '
          'Stylesheets must be accessible during processing. ',
          ['--embed-stylesheet'],
          {'default': False, 'action': 'store_true',
           'validator': frontend.validate_boolean}),
         ('Comma-separated list of directories where stylesheets are found. '
          'Used by --stylesheet-path when expanding relative path arguments. '
          'Default: ".".',
          ['--stylesheet-dirs'],
          {'metavar': '<dir[,dir,...]>',
           'validator': frontend.validate_comma_separated_list,
           'default': ['.']}),
         ('Customization by LaTeX code in the preamble. '
          'Default: select PDF standard fonts (Times, Helvetica, Courier).',
          ['--latex-preamble'],
          {'default': default_preamble}),
         ('Specify the template file. Default: "%s".' % default_template,
          ['--template'],
          {'default': default_template, 'metavar': '<file>'}),
         ('Table of contents by LaTeX. (default)',
          ['--use-latex-toc'],
          {'default': True, 'action': 'store_true',
           'validator': frontend.validate_boolean}),
         ('Table of contents by Docutils (without page numbers).',
          ['--use-docutils-toc'],
          {'dest': 'use_latex_toc', 'action': 'store_false',
           'validator': frontend.validate_boolean}),
         ('Add parts on top of the section hierarchy.',
          ['--use-part-section'],
          {'default': False, 'action': 'store_true',
           'validator': frontend.validate_boolean}),
         ('Attach author and date to the document info table. (default)',
          ['--use-docutils-docinfo'],
          {'dest': 'use_latex_docinfo', 'action': 'store_false',
           'validator': frontend.validate_boolean}),
         ('Attach author and date to the document title.',
          ['--use-latex-docinfo'],
          {'default': False, 'action': 'store_true',
           'validator': frontend.validate_boolean}),
         ("Typeset abstract as topic. (default)",
          ['--topic-abstract'],
          {'dest': 'use_latex_abstract', 'action': 'store_false',
           'validator': frontend.validate_boolean}),
         ("Use LaTeX abstract environment for the document's abstract.",
          ['--use-latex-abstract'],
          {'default': False, 'action': 'store_true',
           'validator': frontend.validate_boolean}),
         ('Color of any hyperlinks embedded in text. '
          'Default: "blue" (use "false" to disable).',
          ['--hyperlink-color'], {'default': 'blue'}),
         ('Additional options to the "hyperref" package.',
          ['--hyperref-options'], {'default': ''}),
         ('Enable compound enumerators for nested enumerated lists '
          '(e.g. "1.2.a.ii").',
          ['--compound-enumerators'],
          {'default': False, 'action': 'store_true',
           'validator': frontend.validate_boolean}),
         ('Disable compound enumerators for nested enumerated lists. '
          '(default)',
          ['--no-compound-enumerators'],
          {'action': 'store_false', 'dest': 'compound_enumerators'}),
         ('Enable section ("." subsection ...) prefixes for compound '
          'enumerators.  This has no effect without --compound-enumerators.',
          ['--section-prefix-for-enumerators'],
          {'default': None, 'action': 'store_true',
           'validator': frontend.validate_boolean}),
         ('Disable section prefixes for compound enumerators. (default)',
          ['--no-section-prefix-for-enumerators'],
          {'action': 'store_false', 'dest': 'section_prefix_for_enumerators'}),
         ('Set the separator between section number and enumerator '
          'for compound enumerated lists.  Default: "-".',
          ['--section-enumerator-separator'],
          {'default': '-', 'metavar': '<char>'}),
         ('When possible, use the specified environment for literal-blocks. '
          'Default: "" (fall back to "alltt").',
          ['--literal-block-env'],
          {'default': ''}),
         ('When possible, use "verbatim" for literal-blocks. '
          'Compatibility alias for "--literal-block-env=verbatim".',
          ['--use-verbatim-when-possible'],
          {'default': False, 'action': 'store_true',
           'validator': frontend.validate_boolean}),
         ('Table style. "standard" with horizontal and vertical lines, '
          '"booktabs" (LaTeX booktabs style) only horizontal lines '
          'above and below the table and below the header, or "borderless". '
          'Default: "standard"',
          ['--table-style'],
          {'default': ['standard'],
           'metavar': '<format>',
           'action': 'append',
           'validator': frontend.validate_comma_separated_list,
           'choices': table_style_values}),
         ('LaTeX graphicx package option. '
          'Possible values are "dvips", "pdftex". "auto" includes LaTeX code '
          'to use "pdftex" if processing with pdf(la)tex and dvips otherwise. '
          'Default: "".',
          ['--graphicx-option'],
          {'default': ''}),
         ('LaTeX font encoding. '
          'Possible values are "", "T1" (default), "OT1", "LGR,T1" or '
          'any other combination of options to the `fontenc` package. ',
          ['--font-encoding'],
          {'default': 'T1'}),
         ('Per default the latex-writer puts the reference title into '
          'hyperreferences. Specify "ref*" or "pageref*" to get the section '
          'number or the page number.',
          ['--reference-label'],
          {'default': ''}),
         ('Specify style and database for bibtex, for example '
          '"--use-bibtex=mystyle,mydb1,mydb2".',
          ['--use-bibtex'],
          {'default': ''}),
         # TODO: implement "latex footnotes" alternative
         ('Footnotes with numbers/symbols by Docutils. (default) '
          '(The alternative, --latex-footnotes, is not implemented yet.)',
           ['--docutils-footnotes'],
           {'default': True,
            'action': 'store_true',
            'validator': frontend.validate_boolean}),
        ),)

    settings_defaults = {'sectnum_depth': 0 # updated by SectNum transform
                        }
    config_section = 'latex2e writer'
    config_section_dependencies = ('writers', 'latex writers')

    head_parts = ('head_prefix', 'requirements', 'latex_preamble',
                  'stylesheet', 'fallbacks', 'pdfsetup', 'titledata')
    visitor_attributes = head_parts + ('title', 'subtitle',
                                       'body_pre_docinfo', 'docinfo',
                                       'dedication', 'abstract', 'body')

    output = None
    """Final translated form of `document`."""

    def __init__(self):
        writers.Writer.__init__(self)
        self.translator_class = LaTeXTranslator

    # Override parent method to add latex-specific transforms
    def get_transforms(self):
       return writers.Writer.get_transforms(self) + [
       # Convert specific admonitions to generic one
       writer_aux.Admonitions,
       # TODO: footnote collection transform
       ]

    def translate(self):
        visitor = self.translator_class(self.document)
        self.document.walkabout(visitor)
        # copy parts
        for part in self.visitor_attributes:
            setattr(self, part, getattr(visitor, part))
        # get template string from file
        try:
            template_file = open(self.document.settings.template, 'rb')
        except IOError:
            template_file = open(os.path.join(self.default_template_path,
                                     self.document.settings.template), 'rb')
        template = string.Template(unicode(template_file.read(), 'utf-8'))
        template_file.close()
        # fill template
        self.assemble_parts() # create dictionary of parts
        self.output = template.substitute(self.parts)

    def assemble_parts(self):
        """Assemble the `self.parts` dictionary of output fragments."""
        writers.Writer.assemble_parts(self)
        for part in self.visitor_attributes:
            lines = getattr(self, part)
            if part in self.head_parts:
                if lines:
                    lines.append('') # to get a trailing newline
                self.parts[part] = '\n'.join(lines)
            else:
                # body contains inline elements, so join without newline
                self.parts[part] = ''.join(lines)


class Babel(object):
    """Language specifics for LaTeX."""

    # TeX (babel) language names:
    # ! not all of these are supported by Docutils!
    #
    # based on LyX' languages file with adaptions to `BCP 47`_
    # (http://www.rfc-editor.org/rfc/bcp/bcp47.txt) and
    # http://www.tug.org/TUGboat/Articles/tb29-3/tb93miklavec.pdf
    # * the key without subtags is the default
    # * case is ignored
    # cf. http://docutils.sourceforge.net/docs/howto/i18n.html
    #     http://www.w3.org/International/articles/language-tags/
    # and http://www.iana.org/assignments/language-subtag-registry
    language_codes = {
        # code          TeX/Babel-name       comment
        'af':           'afrikaans',
        'ar':           'arabic',
        # 'be':           'belarusian',
        'bg':           'bulgarian',
        'br':           'breton',
        'ca':           'catalan',
        # 'cop':          'coptic',
        'cs':           'czech',
        'cy':           'welsh',
        'da':           'danish',
        'de':           'ngerman', # new spelling (de_1996)
        'de-1901':      'german', # old spelling
        'de-AT':        'naustrian',
        'de-AT-1901':   'austrian',
        'dsb':          'lowersorbian',
        'el':           'greek', # monotonic (el-monoton)
        'el-polyton':   'polutonikogreek',
        'en':           'english',  # TeX' default language
        'en-AU':        'australian',
        'en-CA':        'canadian',
        'en-GB':        'british',
        'en-NZ':        'newzealand',
        'en-US':        'american',
        'eo':           'esperanto',
        'es':           'spanish',
        'et':           'estonian',
        'eu':           'basque',
        # 'fa':           'farsi',
        'fi':           'finnish',
        'fr':           'french',
        'fr-CA':        'canadien',
        'ga':           'irish',    # Irish Gaelic
        # 'grc':                    # Ancient Greek
        'grc-ibycus':   'ibycus',   # Ibycus encoding
        'gl':           'galician',
        'he':           'hebrew',
        'hr':           'croatian',
        'hsb':          'uppersorbian',
        'hu':           'magyar',
        'ia':           'interlingua',
        'id':           'bahasai',  # Bahasa (Indonesian)
        'is':           'icelandic',
        'it':           'italian',
        'ja':           'japanese',
        'kk':           'kazakh',
        'la':           'latin',
        'lt':           'lithuanian',
        'lv':           'latvian',
        'mn':           'mongolian', # Mongolian, Cyrillic script (mn-cyrl)
        'ms':           'bahasam',   # Bahasa (Malay)
        'nb':           'norsk',     # Norwegian Bokmal
        'nl':           'dutch',
        'nn':           'nynorsk',   # Norwegian Nynorsk
        'no':           'norsk',     # Norwegian (Bokmal)
        'pl':           'polish',
        'pt':           'portuges',
        'pt-BR':        'brazil',
        'ro':           'romanian',
        'ru':           'russian',
        'se':           'samin',     # North Sami
        'sh-Cyrl':      'serbianc',  # Serbo-Croatian, Cyrillic script
        'sh-Latn':      'serbian',   # Serbo-Croatian, Latin script see also 'hr'
        'sk':           'slovak',
        'sl':           'slovene',
        'sq':           'albanian',
        'sr':           'serbianc',  # Serbian, Cyrillic script (contributed)
        'sr-Latn':      'serbian',   # Serbian, Latin script
        'sv':           'swedish',
        # 'th':           'thai',
        'tr':           'turkish',
        'uk':           'ukrainian',
        'vi':           'vietnam',
        # zh-Latn:      Chinese Pinyin
        }
    # normalize (downcase) keys
    language_codes = dict([(k.lower(), v) for (k, v) in language_codes.items()])

    warn_msg = 'Language "%s" not supported by LaTeX (babel)'

    # "Active characters" are shortcuts that start a LaTeX macro and may need
    # escaping for literals use. Characters that prevent literal use (e.g.
    # starting accent macros like "a -> ä) will be deactivated if one of the
    # defining languages is used in the document.
    # Special cases:
    #  ~ (tilde) -- used in estonian, basque, galician, and old versions of
    #    spanish -- cannot be deactivated as it denotes a no-break space macro,
    #  " (straight quote) -- used in albanian, austrian, basque
    #    brazil, bulgarian, catalan, czech, danish, dutch, estonian,
    #    finnish, galician, german, icelandic, italian, latin, naustrian,
    #    ngerman, norsk, nynorsk, polish, portuges, russian, serbian, slovak,
    #    slovene, spanish, swedish, ukrainian, and uppersorbian --
    #    is escaped as ``\textquotedbl``.
    active_chars = {# TeX/Babel-name:  active characters to deactivate
                    # 'breton':        ':;!?' # ensure whitespace
                    # 'esperanto':     '^',
                    # 'estonian':      '~"`',
                    # 'french':        ':;!?' # ensure whitespace
                    'galician':        '.<>', # also '~"'
                    # 'magyar':        '`', # for special hyphenation cases
                    'spanish':         '.<>', # old versions also '~'
                    # 'turkish':       ':!=' # ensure whitespace
                   }

    def __init__(self, language_code, reporter=None):
        self.reporter = reporter
        self.language = self.language_name(language_code)
        self.otherlanguages = {}

    def __call__(self):
        """Return the babel call with correct options and settings"""
        languages = sorted(self.otherlanguages.keys())
        languages.append(self.language or 'english')
        self.setup = [r'\usepackage[%s]{babel}' % ','.join(languages)]
        # Deactivate "active characters"
        shorthands = []
        for c in ''.join([self.active_chars.get(l, '') for l in languages]):
            if c not in shorthands:
                shorthands.append(c)
        if shorthands:
            self.setup.append(r'\AtBeginDocument{\shorthandoff{%s}}'
                              % ''.join(shorthands))
        # Including '~' in shorthandoff prevents its use as no-break space
        if 'galician' in languages:
            self.setup.append(r'\deactivatetilden % restore ~ in Galician')
        if 'estonian' in languages:
            self.setup.extend([r'\makeatletter',
                               r'  \addto\extrasestonian{\bbl@deactivate{~}}',
                               r'\makeatother'])
        if 'basque' in languages:
            self.setup.extend([r'\makeatletter',
                               r'  \addto\extrasbasque{\bbl@deactivate{~}}',
                               r'\makeatother'])
        if (languages[-1] == 'english' and
            'french' in self.otherlanguages.keys()):
            self.setup += ['% Prevent side-effects if French hyphenation '
                           'patterns are not loaded:',
                           r'\frenchbsetup{StandardLayout}',
                           r'\AtBeginDocument{\selectlanguage{%s}'
                           r'\noextrasfrench}' % self.language]
        return '\n'.join(self.setup)

    def language_name(self, language_code):
        """Return TeX language name for `language_code`"""
        for tag in utils.normalize_language_tag(language_code):
            try:
                return self.language_codes[tag]
            except KeyError:
                pass
        if self.reporter is not None:
            self.reporter.warning(self.warn_msg % language_code)
        return ''

    def get_language(self):
        # Obsolete, kept for backwards compatibility with Sphinx
        return self.language


# Building blocks for the latex preamble
# --------------------------------------

class SortableDict(dict):
    """Dictionary with additional sorting methods

    Tip: use key starting with with '_' for sorting before small letters
         and with '~' for sorting after small letters.
    """
    def sortedkeys(self):
        """Return sorted list of keys"""
        keys = sorted(self.keys())
        return keys

    def sortedvalues(self):
        """Return list of values sorted by keys"""
        return [self[key] for key in self.sortedkeys()]


# PreambleCmds
# `````````````
# A container for LaTeX code snippets that can be
# inserted into the preamble if required in the document.
#
# .. The package 'makecmds' would enable shorter definitions using the
#    \providelength and \provideenvironment commands.
#    However, it is pretty non-standard (texlive-latex-extra).

class PreambleCmds(object):
    """Building blocks for the latex preamble."""

PreambleCmds.abstract = r"""
% abstract title
\providecommand*{\DUtitleabstract}[1]{\centerline{\textbf{#1}}}"""

PreambleCmds.admonition = r"""
% admonition (specially marked topic)
\providecommand{\DUadmonition}[2][class-arg]{%
  % try \DUadmonition#1{#2}:
  \ifcsname DUadmonition#1\endcsname%
    \csname DUadmonition#1\endcsname{#2}%
  \else
    \begin{center}
      \fbox{\parbox{0.9\linewidth}{#2}}
    \end{center}
  \fi
}"""

## PreambleCmds.caption = r"""% configure caption layout
## \usepackage{caption}
## \captionsetup{singlelinecheck=false}% no exceptions for one-liners"""

PreambleCmds.color = r"""\usepackage{color}"""

PreambleCmds.docinfo = r"""
% docinfo (width of docinfo table)
\DUprovidelength{\DUdocinfowidth}{0.9\linewidth}"""
# PreambleCmds.docinfo._depends = 'providelength'

PreambleCmds.dedication = r"""
% dedication topic
\providecommand*{\DUCLASSdedication}{%
  \renewenvironment{quote}{\begin{center}}{\end{center}}%
}"""

PreambleCmds.duclass = r"""
% class handling for environments (block-level elements)
% \begin{DUclass}{spam} tries \DUCLASSspam and
% \end{DUclass}{spam} tries \endDUCLASSspam
\ifx\DUclass\undefined % poor man's "provideenvironment"
 \newenvironment{DUclass}[1]%
  {\def\DocutilsClassFunctionName{DUCLASS#1}% arg cannot be used in end-part of environment.
     \csname \DocutilsClassFunctionName \endcsname}%
  {\csname end\DocutilsClassFunctionName \endcsname}%
\fi"""

PreambleCmds.error = r"""
% error admonition title
\providecommand*{\DUtitleerror}[1]{\DUtitle{\color{red}#1}}"""

PreambleCmds.fieldlist = r"""
% fieldlist environment
\ifthenelse{\isundefined{\DUfieldlist}}{
  \newenvironment{DUfieldlist}%
    {\quote\description}
    {\enddescription\endquote}
}{}"""

PreambleCmds.float_settings = r"""\usepackage{float} % float configuration
\floatplacement{figure}{H} % place figures here definitely"""

PreambleCmds.footnotes = r"""% numeric or symbol footnotes with hyperlinks
\providecommand*{\DUfootnotemark}[3]{%
  \raisebox{1em}{\hypertarget{#1}{}}%
  \hyperlink{#2}{\textsuperscript{#3}}%
}
\providecommand{\DUfootnotetext}[4]{%
  \begingroup%
  \renewcommand{\thefootnote}{%
    \protect\raisebox{1em}{\protect\hypertarget{#1}{}}%
    \protect\hyperlink{#2}{#3}}%
  \footnotetext{#4}%
  \endgroup%
}"""

PreambleCmds.graphicx_auto = r"""% Check output format
\ifx\pdftexversion\undefined
  \usepackage{graphicx}
\else
  \usepackage[pdftex]{graphicx}
\fi"""

PreambleCmds.highlight_rules = r"""% basic code highlight:
\providecommand*\DUrolecomment[1]{\textcolor[rgb]{0.40,0.40,0.40}{#1}}
\providecommand*\DUroledeleted[1]{\textcolor[rgb]{0.40,0.40,0.40}{#1}}
\providecommand*\DUrolekeyword[1]{\textbf{#1}}
\providecommand*\DUrolestring[1]{\textit{#1}}"""

PreambleCmds.inline = r"""
% inline markup (custom roles)
% \DUrole{#1}{#2} tries \DUrole#1{#2}
\providecommand*{\DUrole}[2]{%
  \ifcsname DUrole#1\endcsname%
    \csname DUrole#1\endcsname{#2}%
  \else
    % backwards compatibility: try \docutilsrole#1{#2}
    \ifcsname docutilsrole#1\endcsname%
      \PackageWarningNoLine{docutils}{Command prefix "docutilsrole" is
         deprecated, \MessageBreak use `\protect\DUrole #1`}
      \csname docutilsrole#1\endcsname{#2}%
    \else%
      #2%
    \fi%
  \fi%
}"""

PreambleCmds.legend = r"""
% legend environment
\ifthenelse{\isundefined{\DUlegend}}{
  \newenvironment{DUlegend}{\small}{}
}{}"""

PreambleCmds.lineblock = r"""
% lineblock environment
\DUprovidelength{\DUlineblockindent}{2.5em}
\ifthenelse{\isundefined{\DUlineblock}}{
  \newenvironment{DUlineblock}[1]{%
    \list{}{\setlength{\partopsep}{\parskip}
            \addtolength{\partopsep}{\baselineskip}
            \setlength{\topsep}{0pt}
            \setlength{\itemsep}{0.15\baselineskip}
            \setlength{\parsep}{0pt}
            \setlength{\leftmargin}{#1}}
    \raggedright
  }
  {\endlist}
}{}"""
# PreambleCmds.lineblock._depends = 'providelength'

PreambleCmds.linking = r"""%% hyperlinks:
\ifthenelse{\isundefined{\hypersetup}}{
  \usepackage[%s]{hyperref}
  \usepackage{bookmark}
  \urlstyle{same} %% normal text font (alternatives: tt, rm, sf)
}{}"""

PreambleCmds.minitoc = r"""%% local table of contents
\usepackage{minitoc}"""

PreambleCmds.optionlist = r"""
% optionlist environment
\providecommand*{\DUoptionlistlabel}[1]{\bf #1 \hfill}
\DUprovidelength{\DUoptionlistindent}{3cm}
\ifthenelse{\isundefined{\DUoptionlist}}{
  \newenvironment{DUoptionlist}{%
    \list{}{\setlength{\labelwidth}{\DUoptionlistindent}
            \setlength{\rightmargin}{1cm}
            \setlength{\leftmargin}{\rightmargin}
            \addtolength{\leftmargin}{\labelwidth}
            \addtolength{\leftmargin}{\labelsep}
            \renewcommand{\makelabel}{\DUoptionlistlabel}}
  }
  {\endlist}
}{}"""
# PreambleCmds.optionlist._depends = 'providelength'

PreambleCmds.providelength = r"""
% providelength (provide a length variable and set default, if it is new)
\providecommand*{\DUprovidelength}[2]{
  \ifthenelse{\isundefined{#1}}{\newlength{#1}\setlength{#1}{#2}}{}
}"""

PreambleCmds.rubric = r"""
% rubric (informal heading)
\providecommand*{\DUrubric}[1]{\subsubsection*{\emph{#1}}}"""

PreambleCmds.sidebar = r"""
% sidebar (text outside the main text flow)
\providecommand{\DUsidebar}[1]{%
  \begin{center}
    \colorbox[gray]{0.80}{\parbox{0.9\linewidth}{#1}}
  \end{center}
}"""

PreambleCmds.subtitle = r"""
% subtitle (for sidebar)
\providecommand*{\DUsubtitle}[1]{\par\emph{#1}\smallskip}"""

PreambleCmds.documentsubtitle = r"""
% subtitle (in document title)
\providecommand*{\DUdocumentsubtitle}[1]{{\large #1}}"""

PreambleCmds.table = r"""\usepackage{longtable,ltcaption,array}
\setlength{\extrarowheight}{2pt}
\newlength{\DUtablewidth} % internal use in tables"""

# Options [force,almostfull] prevent spurious error messages, see
# de.comp.text.tex/2005-12/msg01855
PreambleCmds.textcomp = """\
\\usepackage{textcomp} % text symbol macros"""

PreambleCmds.textsubscript = r"""
% text mode subscript
\ifx\textsubscript\undefined
  \usepackage{fixltx2e} % since 2015 loaded by default
\fi"""

PreambleCmds.titlereference = r"""
% titlereference role
\providecommand*{\DUroletitlereference}[1]{\textsl{#1}}"""

PreambleCmds.title = r"""
% title for topics, admonitions, unsupported section levels, and sidebar
\providecommand*{\DUtitle}[2][class-arg]{%
  % call \DUtitle#1{#2} if it exists:
  \ifcsname DUtitle#1\endcsname%
    \csname DUtitle#1\endcsname{#2}%
  \else
    \smallskip\noindent\textbf{#2}\smallskip%
  \fi
}"""

PreambleCmds.transition = r"""
% transition (break, fancybreak, anonymous section)
\providecommand*{\DUtransition}{%
  \hspace*{\fill}\hrulefill\hspace*{\fill}
  \vskip 0.5\baselineskip
}"""


# LaTeX encoding maps
# -------------------
# ::

class CharMaps(object):
    """LaTeX representations for active and Unicode characters."""

    # characters that need escaping even in `alltt` environments:
    alltt = {
        ord('\\'): u'\\textbackslash{}',
        ord('{'): u'\\{',
        ord('}'): u'\\}',
    }
    # characters that normally need escaping:
    special = {
        ord('#'): u'\\#',
        ord('$'): u'\\$',
        ord('%'): u'\\%',
        ord('&'): u'\\&',
        ord('~'): u'\\textasciitilde{}',
        ord('_'): u'\\_',
        ord('^'): u'\\textasciicircum{}',
        # straight double quotes are 'active' in many languages
        ord('"'): u'\\textquotedbl{}',
        # Square brackets are ordinary chars and cannot be escaped with '\',
        # so we put them in a group '{[}'. (Alternative: ensure that all
        # macros with optional arguments are terminated with {} and text
        # inside any optional argument is put in a group ``[{text}]``).
        # Commands with optional args inside an optional arg must be put in a
        # group, e.g. ``\item[{\hyperref[label]{text}}]``.
        ord('['): u'{[}',
        ord(']'): u'{]}',
        # the soft hyphen is unknown in 8-bit text
        # and not properly handled by XeTeX
        0x00AD: u'\\-', # SOFT HYPHEN
    }
    # Unicode chars that are not recognized by LaTeX's utf8 encoding
    unsupported_unicode = {
        # TODO: ensure white space also at the beginning of a line?
        # 0x00A0: u'\\leavevmode\\nobreak\\vadjust{}~'
        0x2000: u'\\enskip', # EN QUAD
        0x2001: u'\\quad', # EM QUAD
        0x2002: u'\\enskip', # EN SPACE
        0x2003: u'\\quad', # EM SPACE
        0x2008: u'\\,', # PUNCTUATION SPACE   
        0x200b: u'\\hspace{0pt}', # ZERO WIDTH SPACE
        0x202F: u'\\,', # NARROW NO-BREAK SPACE
        # 0x02d8: u'\\\u{ }', # BREVE
        0x2011: u'\\hbox{-}', # NON-BREAKING HYPHEN
        0x212b: u'\\AA', # ANGSTROM SIGN
        0x21d4: u'\\ensuremath{\\Leftrightarrow}',
        # Docutils footnote symbols:
        0x2660: u'\\ensuremath{\\spadesuit}',
        0x2663: u'\\ensuremath{\\clubsuit}',
        0xfb00: u'ff', # LATIN SMALL LIGATURE FF
        0xfb01: u'fi', # LATIN SMALL LIGATURE FI
        0xfb02: u'fl', # LATIN SMALL LIGATURE FL
        0xfb03: u'ffi', # LATIN SMALL LIGATURE FFI
        0xfb04: u'ffl', # LATIN SMALL LIGATURE FFL
    }
    # Unicode chars that are recognized by LaTeX's utf8 encoding
    utf8_supported_unicode = {
        0x00A0: u'~', # NO-BREAK SPACE
        0x00AB: u'\\guillemotleft{}', # LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
        0x00bb: u'\\guillemotright{}', # RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
        0x200C: u'\\textcompwordmark{}', # ZERO WIDTH NON-JOINER
        0x2013: u'\\textendash{}',
        0x2014: u'\\textemdash{}',
        0x2018: u'\\textquoteleft{}',
        0x2019: u'\\textquoteright{}',
        0x201A: u'\\quotesinglbase{}', # SINGLE LOW-9 QUOTATION MARK
        0x201C: u'\\textquotedblleft{}',
        0x201D: u'\\textquotedblright{}',
        0x201E: u'\\quotedblbase{}', # DOUBLE LOW-9 QUOTATION MARK
        0x2030: u'\\textperthousand{}',   # PER MILLE SIGN
        0x2031: u'\\textpertenthousand{}', # PER TEN THOUSAND SIGN
        0x2039: u'\\guilsinglleft{}',
        0x203A: u'\\guilsinglright{}',
        0x2423: u'\\textvisiblespace{}',  # OPEN BOX
        0x2020: u'\\dag{}',
        0x2021: u'\\ddag{}',
        0x2026: u'\\dots{}',
        0x2122: u'\\texttrademark{}',
    }
    # recognized with 'utf8', if textcomp is loaded
    textcomp = {
        # Latin-1 Supplement
        0x00a2: u'\\textcent{}',          # ¢ CENT SIGN
        0x00a4: u'\\textcurrency{}',      # ¤ CURRENCY SYMBOL
        0x00a5: u'\\textyen{}',           # ¥ YEN SIGN
        0x00a6: u'\\textbrokenbar{}',     # ¦ BROKEN BAR
        0x00a7: u'\\textsection{}',       # § SECTION SIGN
        0x00a8: u'\\textasciidieresis{}', # ¨ DIAERESIS
        0x00a9: u'\\textcopyright{}',     # © COPYRIGHT SIGN
        0x00aa: u'\\textordfeminine{}',   # ª FEMININE ORDINAL INDICATOR
        0x00ac: u'\\textlnot{}',          # ¬ NOT SIGN
        0x00ae: u'\\textregistered{}',    # ® REGISTERED SIGN
        0x00af: u'\\textasciimacron{}',   # ¯ MACRON
        0x00b0: u'\\textdegree{}',        # ° DEGREE SIGN
        0x00b1: u'\\textpm{}',            # ± PLUS-MINUS SIGN
        0x00b2: u'\\texttwosuperior{}',   # ² SUPERSCRIPT TWO
        0x00b3: u'\\textthreesuperior{}', # ³ SUPERSCRIPT THREE
        0x00b4: u'\\textasciiacute{}',    # ´ ACUTE ACCENT
        0x00b5: u'\\textmu{}',            # µ MICRO SIGN
        0x00b6: u'\\textparagraph{}',     # ¶ PILCROW SIGN # != \textpilcrow
        0x00b9: u'\\textonesuperior{}',   # ¹ SUPERSCRIPT ONE
        0x00ba: u'\\textordmasculine{}',  # º MASCULINE ORDINAL INDICATOR
        0x00bc: u'\\textonequarter{}',    # 1/4 FRACTION
        0x00bd: u'\\textonehalf{}',       # 1/2 FRACTION
        0x00be: u'\\textthreequarters{}', # 3/4 FRACTION
        0x00d7: u'\\texttimes{}',         # × MULTIPLICATION SIGN
        0x00f7: u'\\textdiv{}',           # ÷ DIVISION SIGN
        # others
        0x0192: u'\\textflorin{}',        # LATIN SMALL LETTER F WITH HOOK
        0x02b9: u'\\textasciiacute{}',    # MODIFIER LETTER PRIME
        0x02ba: u'\\textacutedbl{}',      # MODIFIER LETTER DOUBLE PRIME
        0x2016: u'\\textbardbl{}',        # DOUBLE VERTICAL LINE
        0x2022: u'\\textbullet{}',        # BULLET
        0x2032: u'\\textasciiacute{}',    # PRIME
        0x2033: u'\\textacutedbl{}',      # DOUBLE PRIME
        0x2035: u'\\textasciigrave{}',    # REVERSED PRIME
        0x2036: u'\\textgravedbl{}',      # REVERSED DOUBLE PRIME
        0x203b: u'\\textreferencemark{}', # REFERENCE MARK
        0x203d: u'\\textinterrobang{}',   # INTERROBANG
        0x2044: u'\\textfractionsolidus{}', # FRACTION SLASH
        0x2045: u'\\textlquill{}',        # LEFT SQUARE BRACKET WITH QUILL
        0x2046: u'\\textrquill{}',        # RIGHT SQUARE BRACKET WITH QUILL
        0x2052: u'\\textdiscount{}',      # COMMERCIAL MINUS SIGN
        0x20a1: u'\\textcolonmonetary{}', # COLON SIGN
        0x20a3: u'\\textfrenchfranc{}',   # FRENCH FRANC SIGN
        0x20a4: u'\\textlira{}',          # LIRA SIGN
        0x20a6: u'\\textnaira{}',         # NAIRA SIGN
        0x20a9: u'\\textwon{}',           # WON SIGN
        0x20ab: u'\\textdong{}',          # DONG SIGN
        0x20ac: u'\\texteuro{}',          # EURO SIGN
        0x20b1: u'\\textpeso{}',          # PESO SIGN
        0x20b2: u'\\textguarani{}',       # GUARANI SIGN
        0x2103: u'\\textcelsius{}',       # DEGREE CELSIUS
        0x2116: u'\\textnumero{}',        # NUMERO SIGN
        0x2117: u'\\textcircledP{}',      # SOUND RECORDING COYRIGHT
        0x211e: u'\\textrecipe{}',        # PRESCRIPTION TAKE
        0x2120: u'\\textservicemark{}',   # SERVICE MARK
        0x2122: u'\\texttrademark{}',     # TRADE MARK SIGN
        0x2126: u'\\textohm{}',           # OHM SIGN
        0x2127: u'\\textmho{}',           # INVERTED OHM SIGN
        0x212e: u'\\textestimated{}',     # ESTIMATED SYMBOL
        0x2190: u'\\textleftarrow{}',     # LEFTWARDS ARROW
        0x2191: u'\\textuparrow{}',       # UPWARDS ARROW
        0x2192: u'\\textrightarrow{}',    # RIGHTWARDS ARROW
        0x2193: u'\\textdownarrow{}',     # DOWNWARDS ARROW
        0x2212: u'\\textminus{}',         # MINUS SIGN
        0x2217: u'\\textasteriskcentered{}', # ASTERISK OPERATOR
        0x221a: u'\\textsurd{}',          # SQUARE ROOT
        0x2422: u'\\textblank{}',         # BLANK SYMBOL
        0x25e6: u'\\textopenbullet{}',    # WHITE BULLET
        0x25ef: u'\\textbigcircle{}',     # LARGE CIRCLE
        0x266a: u'\\textmusicalnote{}',   # EIGHTH NOTE
        0x26ad: u'\\textmarried{}',       # MARRIAGE SYMBOL
        0x26ae: u'\\textdivorced{}',      # DIVORCE SYMBOL
        0x27e8: u'\\textlangle{}',        # MATHEMATICAL LEFT ANGLE BRACKET
        0x27e9: u'\\textrangle{}',        # MATHEMATICAL RIGHT ANGLE BRACKET
    }
    # Unicode chars that require a feature/package to render
    pifont = {
        0x2665: u'\\ding{170}',     # black heartsuit
        0x2666: u'\\ding{169}',     # black diamondsuit
        0x2713: u'\\ding{51}',      # check mark
        0x2717: u'\\ding{55}',      # check mark
    }
    # TODO: greek alphabet ... ?
    # see also LaTeX codec
    # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/252124
    # and unimap.py from TeXML


class DocumentClass(object):
    """Details of a LaTeX document class."""

    def __init__(self, document_class, with_part=False):
        self.document_class = document_class
        self._with_part = with_part
        self.sections = ['section', 'subsection', 'subsubsection',
                         'paragraph', 'subparagraph']
        if self.document_class in ('book', 'memoir', 'report',
                                   'scrbook', 'scrreprt'):
            self.sections.insert(0, 'chapter')
        if self._with_part:
            self.sections.insert(0, 'part')

    def section(self, level):
        """Return the LaTeX section name for section `level`.

        The name depends on the specific document class.
        Level is 1,2,3..., as level 0 is the title.
        """
        if level <= len(self.sections):
            return self.sections[level-1]
        else:  # unsupported levels
            return 'DUtitle[section%s]' % roman.toRoman(level)

class Table(object):
    """Manage a table while traversing.

    Maybe change to a mixin defining the visit/departs, but then
    class Table internal variables are in the Translator.

    Table style might be

    :standard:   horizontal and vertical lines
    :booktabs:   only horizontal lines (requires "booktabs" LaTeX package)
    :borderless: no borders around table cells
    :nolines:    alias for borderless

    :colwidths-auto:  column widths determined by LaTeX
    :colwidths-given: use colum widths from rST source
    """
    def __init__(self, translator, latex_type):
        self._translator = translator
        self._latex_type = latex_type
        self._open = False
        # miscellaneous attributes
        self._attrs = {}
        self._col_width = []
        self._rowspan = []
        self.stubs = []
        self.colwidths_auto = False
        self._in_thead = 0

    def open(self):
        self._open = True
        self._col_specs = []
        self.caption = []
        self._attrs = {}
        self._in_head = False # maybe context with search
    def close(self):
        self._open = False
        self._col_specs = None
        self.caption = []
        self._attrs = {}
        self.stubs = []
        self.colwidths_auto = False

    def is_open(self):
        return self._open

    def set_table_style(self, table_style, classes):
        borders = [cls.replace('nolines', 'borderless')
                   for cls in table_style+classes
                   if cls in ('standard', 'booktabs', 'borderless', 'nolines')]
        try:
            self.borders = borders[-1]
        except IndexError:
            self.borders = 'standard'
        self.colwidths_auto = (('colwidths-auto' in classes
                                and 'colwidths-given' not in table_style)
                               or ('colwidths-auto' in table_style
                                   and ('colwidths-given' not in classes)))

    def get_latex_type(self):
        if self._latex_type == 'longtable' and not self.caption:
            # do not advance the "table" counter (requires "ltcaption" package)
            return('longtable*')
        return self._latex_type

    def set(self, attr, value):
        self._attrs[attr] = value
    def get(self, attr):
        if attr in self._attrs:
            return self._attrs[attr]
        return None

    def get_vertical_bar(self):
        if self.borders == 'standard':
            return '|'
        return ''

    # horizontal lines are drawn below a row,
    def get_opening(self, width=r'\linewidth'):
        align_map = {'left': 'l',
                     'center': 'c',
                     'right': 'r'}
        align = align_map.get(self.get('align') or 'center')
        opening = [r'\begin{%s}[%s]' % (self.get_latex_type(), align)]
        if not self.colwidths_auto:
            opening.insert(0, r'\setlength{\DUtablewidth}{%s}'%width)
        return '\n'.join(opening)

    def get_closing(self):
        closing = []
        if self.borders == 'booktabs':
            closing.append(r'\bottomrule')
        # elif self.borders == 'standard':
        #     closing.append(r'\hline')
        closing.append(r'\end{%s}' % self.get_latex_type())
        return '\n'.join(closing)

    def visit_colspec(self, node):
        self._col_specs.append(node)
        # "stubs" list is an attribute of the tgroup element:
        self.stubs.append(node.attributes.get('stub'))

    def get_colspecs(self, node):
        """Return column specification for longtable.

        Assumes reST line length being 80 characters.
        Table width is hairy.

        === ===
        ABC DEF
        === ===

        usually gets to narrow, therefore we add 1 (fiddlefactor).
        """
        bar = self.get_vertical_bar()
        self._rowspan= [0] * len(self._col_specs)
        self._col_width = []
        if self.colwidths_auto:
            latex_table_spec = (bar+'l')*len(self._col_specs)
            return latex_table_spec+bar
        width = 80
        total_width = 0.0
        # first see if we get too wide.
        for node in self._col_specs:
            colwidth = float(node['colwidth']+1) / width
            total_width += colwidth
        # donot make it full linewidth
        factor = 0.93
        if total_width > 1.0:
            factor /= total_width
        latex_table_spec = ''
        for node in self._col_specs:
            colwidth = factor * float(node['colwidth']+1) / width
            self._col_width.append(colwidth+0.005)
            latex_table_spec += '%sp{%.3f\\DUtablewidth}' % (bar, colwidth+0.005)
        return latex_table_spec+bar

    def get_column_width(self):
        """Return columnwidth for current cell (not multicell)."""
        try:
            return '%.2f\\DUtablewidth' % self._col_width[self._cell_in_row]
        except IndexError:
            return '*'

    def get_multicolumn_width(self, start, len_):
        """Return sum of columnwidths for multicell."""
        try:
            mc_width = sum([width
                            for width in ([self._col_width[start + co]
                                           for co in range (len_)])])
            return 'p{%.2f\\DUtablewidth}' % mc_width
        except IndexError:
            return 'l'

    def get_caption(self):
        if not self.caption:
            return ''
        caption = ''.join(self.caption)
        if 1 == self._translator.thead_depth():
            return r'\caption{%s}\\' '\n' % caption
        return r'\caption[]{%s (... continued)}\\' '\n' % caption

    def need_recurse(self):
        if self._latex_type == 'longtable':
            return 1 == self._translator.thead_depth()
        return 0

    def visit_thead(self):
        self._in_thead += 1
        if self.borders == 'standard':
            return ['\\hline\n']
        elif self.borders == 'booktabs':
            return ['\\toprule\n']
        return []

    def depart_thead(self):
        a = []
        #if self.borders == 'standard':
        #    a.append('\\hline\n')
        if self.borders == 'booktabs':
            a.append('\\midrule\n')
        if self._latex_type == 'longtable':
            if 1 == self._translator.thead_depth():
                a.append('\\endfirsthead\n')
            else:
                a.append('\\endhead\n')
                a.append(r'\multicolumn{%d}{c}' % len(self._col_specs) +
                         r'{\hfill ... continued on next page} \\')
                a.append('\n\\endfoot\n\\endlastfoot\n')
        # for longtable one could add firsthead, foot and lastfoot
        self._in_thead -= 1
        return a

    def visit_row(self):
        self._cell_in_row = 0

    def depart_row(self):
        res = [' \\\\\n']
        self._cell_in_row = None  # remove cell counter
        for i in range(len(self._rowspan)):
            if (self._rowspan[i]>0):
                self._rowspan[i] -= 1

        if self.borders == 'standard':
            rowspans = [i+1 for i in range(len(self._rowspan))
                        if (self._rowspan[i]<=0)]
            if len(rowspans)==len(self._rowspan):
                res.append('\\hline\n')
            else:
                cline = ''
                rowspans.reverse()
                # TODO merge clines
                while True:
                    try:
                        c_start = rowspans.pop()
                    except:
                        break
                    cline += '\\cline{%d-%d}\n' % (c_start, c_start)
                res.append(cline)
        return res

    def set_rowspan(self, cell, value):
        try:
            self._rowspan[cell] = value
        except:
            pass

    def get_rowspan(self, cell):
        try:
            return self._rowspan[cell]
        except:
            return 0

    def get_entry_number(self):
        return self._cell_in_row

    def visit_entry(self):
        self._cell_in_row += 1

    def is_stub_column(self):
        if len(self.stubs) >= self._cell_in_row:
            return self.stubs[self._cell_in_row]
        return False


class LaTeXTranslator(nodes.NodeVisitor):
    """
    Generate code for 8-bit LaTeX from a Docutils document tree.

    See the docstring of docutils.writers._html_base.HTMLTranslator for
    notes on and examples of safe subclassing.
    """

    # When options are given to the documentclass, latex will pass them
    # to other packages, as done with babel.
    # Dummy settings might be taken from document settings

    # Generate code for typesetting with 8-bit latex/pdflatex vs.
    # xelatex/lualatex engine. Overwritten by the XeTeX writer
    is_xetex = False

    # Config setting defaults
    # -----------------------

    # TODO: use mixins for different implementations.
    # list environment for docinfo. else tabularx
    ## use_optionlist_for_docinfo = False # TODO: NOT YET IN USE

    # Use compound enumerations (1.A.1.)
    compound_enumerators = False

    # If using compound enumerations, include section information.
    section_prefix_for_enumerators = False

    # This is the character that separates the section ("." subsection ...)
    # prefix from the regular list enumerator.
    section_enumerator_separator = '-'

    # Auxiliary variables
    # -------------------

    has_latex_toc = False # is there a toc in the doc? (needed by minitoc)
    is_toc_list = False   # is the current bullet_list a ToC?
    section_level = 0

    # Flags to encode():
    # inside citation reference labels underscores dont need to be escaped
    inside_citation_reference_label = False
    verbatim = False                   # do not encode
    insert_non_breaking_blanks = False # replace blanks by "~"
    insert_newline = False             # add latex newline commands
    literal = False                    # literal text (block or inline)
    alltt = False                      # inside `alltt` environment

    def __init__(self, document, babel_class=Babel):
        nodes.NodeVisitor.__init__(self, document)
        # Reporter
        # ~~~~~~~~
        self.warn = self.document.reporter.warning
        self.error = self.document.reporter.error

        # Settings
        # ~~~~~~~~
        self.settings = settings = document.settings
        self.latex_encoding = self.to_latex_encoding(settings.output_encoding)
        self.use_latex_toc = settings.use_latex_toc
        self.use_latex_docinfo = settings.use_latex_docinfo
        self._use_latex_citations = settings.use_latex_citations
        self._reference_label = settings.reference_label
        self.hyperlink_color = settings.hyperlink_color
        self.compound_enumerators = settings.compound_enumerators
        self.font_encoding = getattr(settings, 'font_encoding', '')
        self.section_prefix_for_enumerators = (
            settings.section_prefix_for_enumerators)
        self.section_enumerator_separator = (
            settings.section_enumerator_separator.replace('_', r'\_'))
        # literal blocks:
        self.literal_block_env = ''
        self.literal_block_options = ''
        if settings.literal_block_env:
            (none,
             self.literal_block_env,
             self.literal_block_options,
             none ) = re.split(r'(\w+)(.*)', settings.literal_block_env)
        elif settings.use_verbatim_when_possible:
            self.literal_block_env = 'verbatim'
        #
        if self.settings.use_bibtex:
            self.bibtex = self.settings.use_bibtex.split(',', 1)
            # TODO avoid errors on not declared citations.
        else:
            self.bibtex = None
        # language module for Docutils-generated text
        # (labels, bibliographic_fields, and author_separators)
        self.language_module = languages.get_language(settings.language_code,
                                              document.reporter)
        self.babel = babel_class(settings.language_code, document.reporter)
        self.author_separator = self.language_module.author_separators[0]
        d_options = [self.settings.documentoptions]
        if self.babel.language not in ('english', ''):
            d_options.append(self.babel.language)
        self.documentoptions = ','.join(filter(None, d_options))
        self.d_class = DocumentClass(settings.documentclass,
                                     settings.use_part_section)
        # graphic package options:
        if self.settings.graphicx_option == '':
            self.graphicx_package = r'\usepackage{graphicx}'
        elif self.settings.graphicx_option.lower() == 'auto':
            self.graphicx_package = PreambleCmds.graphicx_auto
        else:
            self.graphicx_package = (r'\usepackage[%s]{graphicx}' %
                                     self.settings.graphicx_option)
        # footnotes: TODO: implement LaTeX footnotes
        self.docutils_footnotes = settings.docutils_footnotes
        # @@ table_style: list of values from fixed set: warn?
        # for s in self.settings.table_style:
        #     if s not in Writer.table_style_values:
        #         self.warn('Ignoring value "%s" in "table-style" setting.' %s)

        # Output collection stacks
        # ~~~~~~~~~~~~~~~~~~~~~~~~

        # Document parts
        self.head_prefix = [r'\documentclass[%s]{%s}' %
            (self.documentoptions, self.settings.documentclass)]
        self.requirements = SortableDict() # made a list in depart_document()
        self.requirements['__static'] = r'\usepackage{ifthen}'
        self.latex_preamble = [settings.latex_preamble]
        self.fallbacks = SortableDict() # made a list in depart_document()
        self.pdfsetup = [] # PDF properties (hyperref package)
        self.title = []
        self.subtitle = []
        self.titledata = [] # \title, \author, \date
        ## self.body_prefix = ['\\begin{document}\n']
        self.body_pre_docinfo = [] # \maketitle
        self.docinfo = []
        self.dedication = []
        self.abstract = []
        self.body = []
        ## self.body_suffix = ['\\end{document}\n']

        self.context = []
        """Heterogeneous stack.

        Used by visit_* and depart_* functions in conjunction with the tree
        traversal. Make sure that the pops correspond to the pushes."""

        # Title metadata:
        self.title_labels = []
        self.subtitle_labels = []
        # (if use_latex_docinfo: collects lists of
        # author/organization/contact/address lines)
        self.author_stack = []
        self.date = []

        # PDF properties: pdftitle, pdfauthor
        # TODO?: pdfcreator, pdfproducer, pdfsubject, pdfkeywords
        self.pdfinfo = []
        self.pdfauthor = []

        # Stack of section counters so that we don't have to use_latex_toc.
        # This will grow and shrink as processing occurs.
        # Initialized for potential first-level sections.
        self._section_number = [0]

        # The current stack of enumerations so that we can expand
        # them into a compound enumeration.
        self._enumeration_counters = []
        # The maximum number of enumeration counters we've used.
        # If we go beyond this number, we need to create a new
        # counter; otherwise, just reuse an old one.
        self._max_enumeration_counters = 0

        self._bibitems = []

        # object for a table while proccessing.
        self.table_stack = []
        self.active_table = Table(self, 'longtable')

        # Where to collect the output of visitor methods (default: body)
        self.out = self.body
        self.out_stack = []  # stack of output collectors

        # Process settings
        # ~~~~~~~~~~~~~~~~
        # Encodings:
        # Docutils' output-encoding => TeX input encoding
        if self.latex_encoding != 'ascii':
            self.requirements['_inputenc'] = (r'\usepackage[%s]{inputenc}'
                                              % self.latex_encoding)
        # TeX font encoding
        if not self.is_xetex:
            if self.font_encoding:
                self.requirements['_fontenc'] = (r'\usepackage[%s]{fontenc}' %
                                                 self.font_encoding)
            # ensure \textquotedbl is defined:
            for enc in self.font_encoding.split(','):
                enc = enc.strip()
                if enc == 'OT1':
                    self.requirements['_textquotedblOT1'] = (
                        r'\DeclareTextSymbol{\textquotedbl}{OT1}{`\"}')
                elif enc not in ('T1', 'T2A', 'T2B', 'T2C', 'T4', 'T5'):
                    self.requirements['_textquotedbl'] = (
                        r'\DeclareTextSymbolDefault{\textquotedbl}{T1}')
        # page layout with typearea (if there are relevant document options)
        if (settings.documentclass.find('scr') == -1 and
            (self.documentoptions.find('DIV') != -1 or
             self.documentoptions.find('BCOR') != -1)):
            self.requirements['typearea'] = r'\usepackage{typearea}'

        # Stylesheets
        # (the name `self.stylesheet` is singular because only one
        # stylesheet was supported before Docutils 0.6).
        self.stylesheet = [self.stylesheet_call(path)
                           for path in utils.get_stylesheet_list(settings)]

        # PDF setup
        if self.hyperlink_color in ('0', 'false', 'False', ''):
            self.hyperref_options = ''
        else:
            self.hyperref_options = 'colorlinks=true,linkcolor=%s,urlcolor=%s' % (
                                      self.hyperlink_color, self.hyperlink_color)
        if settings.hyperref_options:
            self.hyperref_options += ',' + settings.hyperref_options