# -*- coding: utf-8 -*-
# This file is part of lyx2lyx
# Copyright (C) 2018 The LyX team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

""" Convert files to the file format generated by lyx 2.4"""

import re, string
import unicodedata
import sys, os

from datetime import (datetime, date, time)

# Uncomment only what you need to import, please.

from parser_tools import (count_pars_in_inset, del_complete_lines, del_token,
     find_end_of, find_end_of_inset, find_end_of_layout, find_token,
     find_token_backwards, find_token_exact, find_re, get_bool_value,
     get_containing_inset, get_containing_layout, get_option_value, get_value,
     get_quoted_value)
#    del_value, 
#    find_complete_lines,
#    find_re, find_substring,
#    is_in_inset, set_bool_value
#    find_tokens, check_token

from lyx2lyx_tools import (put_cmd_in_ert, add_to_preamble, insert_to_preamble, lyx2latex,
                           revert_language, revert_flex_inset, str2bool)
#  revert_font_attrs, latex_length
#  get_ert, lyx2verbatim, length_in_bp, convert_info_insets
#  revert_flex_inset, hex2ratio

####################################################################
# Private helper functions

def add_preamble_fonts(document, fontmap):
    """Add collected font-packages with their option to user-preamble"""

    for pkg in fontmap:
        if len(fontmap[pkg]) > 0:
            xoption = "[" + ",".join(fontmap[pkg]) + "]"
        else:
            xoption = ""
        preamble = "\\usepackage%s{%s}" % (xoption, pkg)
        add_to_preamble(document, [preamble])


def createkey(pkg, options):
    options.sort()
    return pkg + ':' + "-".join(options)

class fontinfo:
    def __init__(self):
        self.fontname = None    # key into font2pkgmap
        self.fonttype = None    # roman,sans,typewriter,math
        self.scaletype = None   # None,sf,tt
        self.scaleopt = None    # None, 'scaled', 'scale'
        self.scaleval = 1
        self.package = None
        self.options = []
        self.pkgkey = None      # key into pkg2fontmap
        self.osfopt = None      # None, string
        self.osfdef = "false"   # "false" or "true"

    def addkey(self):
        self.pkgkey = createkey(self.package, self.options)

class fontmapping:
    def __init__(self):
        self.font2pkgmap = dict()
        self.pkg2fontmap = dict()
        self.pkginmap = dict()  # defines, if a map for package exists

    def expandFontMapping(self, font_list, font_type, scale_type, pkg, scaleopt = None, osfopt = None, osfdef = "false"):
        """Expand fontinfo mapping"""
        #
        # fontlist:    list of fontnames, each element
        #              may contain a ','-separated list of needed options
        #              like e.g. 'IBMPlexSansCondensed,condensed'
        # font_type:   one of 'roman', 'sans', 'typewriter', 'math'
        # scale_type:  one of None, 'sf', 'tt'
        # pkg:         package defining the font. Defaults to fontname if None
        # scaleopt:    one of None, 'scale', 'scaled', or some other string
        #              to be used in scale option (e.g. scaled=0.7)
        # osfopt:      None or some other string to be used in osf option
        # osfdef:      "true" if osf is default
        for fl in font_list:
            fe = fontinfo()
            fe.fonttype = font_type
            fe.scaletype = scale_type
            flt = fl.split(",")
            font_name = flt[0]
            fe.fontname = font_name
            fe.options = flt[1:]
            fe.scaleopt = scaleopt
            fe.osfopt = osfopt
            fe.osfdef = osfdef
            if pkg == None:
                fe.package = font_name
            else:
                fe.package = pkg
            fe.addkey()
            self.font2pkgmap[font_name] = fe
            if fe.pkgkey in self.pkg2fontmap:
                # Repeated the same entry? Check content
                if self.pkg2fontmap[fe.pkgkey] != font_name:
                    document.error("Something is wrong in pkgname+options <-> fontname mapping")
            self.pkg2fontmap[fe.pkgkey] = font_name
            self.pkginmap[fe.package] = 1

    def getfontname(self, pkg, options):
        options.sort()
        pkgkey = createkey(pkg, options)
        if not pkgkey in self.pkg2fontmap:
            return None
        fontname = self.pkg2fontmap[pkgkey]
        if not fontname in self.font2pkgmap:
            document.error("Something is wrong in pkgname+options <-> fontname mapping")
            return None
        if pkgkey == self.font2pkgmap[fontname].pkgkey:
            return fontname
        return None

def createFontMapping(fontlist):
    # Create info for known fonts for the use in
    #   convert_latexFonts() and
    #   revert_latexFonts()
    #
    # * Would be more handy to parse latexFonts file,
    #   but the path to this file is unknown
    # * For now, add DejaVu and IBMPlex only.
    # * Expand, if desired
    fm = fontmapping()
    for font in fontlist:
        if font == 'DejaVu':
            fm.expandFontMapping(['DejaVuSerif', 'DejaVuSerifCondensed'], "roman", None, None)
            fm.expandFontMapping(['DejaVuSans','DejaVuSansCondensed'], "sans", "sf", None, "scaled")
            fm.expandFontMapping(['DejaVuSansMono'], "typewriter", "tt", None, "scaled")
        elif font == 'IBM':
            fm.expandFontMapping(['IBMPlexSerif', 'IBMPlexSerifThin,thin',
                                  'IBMPlexSerifExtraLight,extralight', 'IBMPlexSerifLight,light',
                                  'IBMPlexSerifSemibold,semibold'],
                                 "roman", None, "plex-serif")
            fm.expandFontMapping(['IBMPlexSans','IBMPlexSansCondensed,condensed',
                                  'IBMPlexSansThin,thin', 'IBMPlexSansExtraLight,extralight',
                                  'IBMPlexSansLight,light', 'IBMPlexSansSemibold,semibold'],
                                 "sans", "sf", "plex-sans", "scale")
            fm.expandFontMapping(['IBMPlexMono', 'IBMPlexMonoThin,thin',
                                  'IBMPlexMonoExtraLight,extralight', 'IBMPlexMonoLight,light',
                                  'IBMPlexMonoSemibold,semibold'],
                                 "typewriter", "tt", "plex-mono", "scale")
        elif font == 'Adobe':
            fm.expandFontMapping(['ADOBESourceSerifPro'], "roman", None, "sourceserifpro", None, "osf")
            fm.expandFontMapping(['ADOBESourceSansPro'], "sans", "sf", "sourcesanspro", "scaled", "osf")
            fm.expandFontMapping(['ADOBESourceCodePro'], "typewriter", "tt", "sourcecodepro", "scaled", "osf")
        elif font == 'Noto':
            fm.expandFontMapping(['NotoSerifRegular,regular', 'NotoSerifMedium,medium',
                                  'NotoSerifThin,thin', 'NotoSerifLight,light',
                                  'NotoSerifExtralight,extralight'],
                                  "roman", None, "noto-serif", None, "osf")
            fm.expandFontMapping(['NotoSansRegular,regular', 'NotoSansMedium,medium',
                                  'NotoSansThin,thin', 'NotoSansLight,light',
                                  'NotoSansExtralight,extralight'],
                                  "sans", "sf", "noto-sans", "scaled")
            fm.expandFontMapping(['NotoMonoRegular,regular'], "typewriter", "tt", "noto-mono", "scaled")
        elif font == 'Cantarell':
            fm.expandFontMapping(['cantarell,defaultsans'],
                                  "sans", "sf", "cantarell", "scaled", "oldstyle")
        elif font == 'Chivo':
            fm.expandFontMapping(['ChivoThin,thin', 'ChivoLight,light',
                                  'Chivo,regular', 'ChivoMedium,medium'],
                                  "sans", "sf", "Chivo", "scale", "oldstyle")
        elif font == 'CrimsonPro':
            fm.expandFontMapping(['CrimsonPro', 'CrimsonProExtraLight,extralight', 'CrimsonProLight,light',
                                  'CrimsonProMedium,medium'],
                                  "roman", None, "CrimsonPro", None, "lf", "true")
        elif font == 'Fira':
            fm.expandFontMapping(['FiraSans', 'FiraSansBook,book',
                                  'FiraSansThin,thin', 'FiraSansLight,light',
                                  'FiraSansExtralight,extralight',
                                  'FiraSansUltralight,ultralight'],
                                  "sans", "sf", "FiraSans", "scaled", "lf", "true")
            fm.expandFontMapping(['FiraMono'], "typewriter", "tt", "FiraMono", "scaled", "lf", "true")
        elif font == 'libertinus':
            fm.expandFontMapping(['libertinus,serif'], "roman", None, "libertinus", None, "osf")
            fm.expandFontMapping(['libertinusmath'], "math", None, "libertinust1math", None, None)
    return fm

def convert_fonts(document, fm, osfoption = "osf"):
    """Handle font definition (LaTeX preamble -> native)"""
    rpkg = re.compile(r'^\\usepackage(\[([^\]]*)\])?\{([^\}]+)\}')
    rscaleopt = re.compile(r'^scaled?=(.*)')

    # Check whether we go beyond font option feature introduction
    haveFontOpts = document.end_format > 580

    i = 0
    while True:
        i = find_re(document.preamble, rpkg, i+1)
        if i == -1:
            return
        mo = rpkg.search(document.preamble[i])
        if mo == None or mo.group(2) == None:
            options = []
        else:
            options = mo.group(2).replace(' ', '').split(",")
        pkg = mo.group(3)
        o = 0
        oscale = 1
        has_osf = False
        while o < len(options):
            if options[o] == osfoption:
                has_osf = True
                del options[o]
                continue
            mo = rscaleopt.search(options[o])
            if mo == None:
                o += 1
                continue
            oscale = mo.group(1)
            del options[o]
            continue

        if not pkg in fm.pkginmap:
            continue
        # determine fontname
        fn = None
        if haveFontOpts:
            # Try with name-option combination first
            # (only one default option supported currently)
            o = 0
            while o < len(options):
                opt = options[o]
                fn = fm.getfontname(pkg, [opt])
                if fn != None:
                    del options[o]
                    break
                o += 1
                continue
            if fn == None:
                fn = fm.getfontname(pkg, [])
        else:
            fn = fm.getfontname(pkg, options)
        if fn == None:
            continue
        del document.preamble[i]
        fontinfo = fm.font2pkgmap[fn]
        if fontinfo.scaletype == None:
            fontscale = None
        else:
            fontscale = "\\font_" + fontinfo.scaletype + "_scale"
            fontinfo.scaleval = oscale
        if (has_osf and fontinfo.osfdef == "false") or (not has_osf and fontinfo.osfdef == "true"):
            if fontinfo.osfopt == None:
                options.extend(osfoption)
                continue
            osf = find_token(document.header, "\\font_osf false")
            osftag = "\\font_osf"
            if osf == -1 and fontinfo.fonttype != "math":
                # Try with newer format
                osftag = "\\font_" + fontinfo.fonttype + "_osf"
                osf = find_token(document.header, osftag + " false")
            if osf != -1:
                document.header[osf] = osftag + " true"
        if i > 0 and document.preamble[i-1] == "% Added by lyx2lyx":
            del document.preamble[i-1]
            i -= 1
        if fontscale != None:
            j = find_token(document.header, fontscale, 0)
            if j != -1:
                val = get_value(document.header, fontscale, j)
                vals = val.split()
                scale = "100"
                if oscale != None:
                    scale = "%03d" % int(float(oscale) * 100)
                document.header[j] = fontscale + " " + scale + " " + vals[1]
        ft = "\\font_" + fontinfo.fonttype
        j = find_token(document.header, ft, 0)
        if j != -1:
            val = get_value(document.header, ft, j)
            words = val.split() # ! splits also values like '"DejaVu Sans"'
            words[0] = '"' + fn + '"'
            document.header[j] = ft + ' ' + ' '.join(words)
        if haveFontOpts and fontinfo.fonttype != "math":
            fotag = "\\font_" + fontinfo.fonttype + "_opts"
            fo = find_token(document.header, fotag)
            if fo != -1:
                document.header[fo] = fotag + " \"" + ",".join(options) + "\""
            else:
                # Sensible place to insert tag
                fo = find_token(document.header, "\\font_sf_scale")
                if fo == -1:
                    document.warning("Malformed LyX document! Missing \\font_sf_scale")
                else:
                    document.header.insert(fo, fotag + " \"" + ",".join(options) + "\"")


def revert_fonts(document, fm, fontmap, OnlyWithXOpts = False, WithXOpts = False):
    """Revert native font definition to LaTeX"""
    # fonlist := list of fonts created from the same package
    # Empty package means that the font-name is the same as the package-name
    # fontmap (key = package, val += found options) will be filled
    # and used later in add_preamble_fonts() to be added to user-preamble

    rfontscale = re.compile(r'^\s*(\\font_(roman|sans|typewriter|math))\s+')
    rscales = re.compile(r'^\s*(\d+)\s+(\d+)')
    i = 0
    while i < len(document.header):
        i = find_re(document.header, rfontscale, i+1)
        if (i == -1):
            return True
        mo = rfontscale.search(document.header[i])
        if mo == None:
            continue
        ft = mo.group(1)    # 'roman', 'sans', 'typewriter', 'math'
        val = get_value(document.header, ft, i)
        words = val.split(' ')     # ! splits also values like '"DejaVu Sans"'
        font = words[0].strip('"') # TeX font name has no whitespace
        if not font in fm.font2pkgmap:
            continue
        fontinfo = fm.font2pkgmap[font]
        val = fontinfo.package
        if not val in fontmap:
            fontmap[val] = []
        x = -1
        if OnlyWithXOpts or WithXOpts:
            if ft == "\\font_math":
                return False
            regexp = re.compile(r'^\s*(\\font_roman_opts)\s+')
            if ft == "\\font_sans":
                regexp = re.compile(r'^\s*(\\font_sans_opts)\s+')
            elif ft == "\\font_typewriter":
                regexp = re.compile(r'^\s*(\\font_typewriter_opts)\s+')
            x = find_re(document.header, regexp, 0)
            if x == -1 and OnlyWithXOpts:
                return False

            if x != -1:
                # We need to use this regex since split() does not handle quote protection
                xopts = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
                opts = xopts[1].strip('"').split(",")
                fontmap[val].extend(opts)
                del document.header[x]
        words[0] = '"default"'
        document.header[i] = ft + ' ' + ' '.join(words)
        if fontinfo.scaleopt != None:
            xval =  get_value(document.header, "\\font_" + fontinfo.scaletype + "_scale", 0)
            mo = rscales.search(xval)
            if mo != None:
                xval1 = mo.group(1)
                xval2 = mo.group(2)
                if xval1 != "100":
                    # set correct scale option
                    fontmap[val].extend([fontinfo.scaleopt + "=" + format(float(xval1) / 100, '.2f')])
        if fontinfo.osfopt != None:
            oldval = "true"
            if fontinfo.osfdef == "true":
                oldval = "false"
            osf = find_token(document.header, "\\font_osf " + oldval)
            if osf == -1 and ft != "\\font_math":
                # Try with newer format
                osftag = "\\font_roman_osf " + oldval
                if ft == "\\font_sans":
                    osftag = "\\font_sans_osf " + oldval
                elif ft == "\\font_typewriter":
                    osftag = "\\font_typewriter_osf " + oldval
                osf = find_token(document.header, osftag)
            if osf != -1:
                fontmap[val].extend([fontinfo.osfopt])
        if len(fontinfo.options) > 0:
            fontmap[val].extend(fontinfo.options)
    return True

###############################################################################
###
### Conversion and reversion routines
###
###############################################################################

def convert_inputencoding_namechange(document):
    """Rename inputencoding settings."""
    i = find_token(document.header, "\\inputencoding", 0)
    if i == -1:
        return
    s = document.header[i].replace("auto", "auto-legacy")
    document.header[i] = s.replace("default", "auto-legacy-plain")

def revert_inputencoding_namechange(document):
    """Rename inputencoding settings."""
    i = find_token(document.header, "\\inputencoding", 0)
    if i == -1:
        return
    s = document.header[i].replace("auto-legacy-plain", "default")
    document.header[i] = s.replace("auto-legacy", "auto")

def convert_notoFonts(document):
    """Handle Noto fonts definition to LaTeX"""

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fm = createFontMapping(['Noto'])
        convert_fonts(document, fm)

def revert_notoFonts(document):
    """Revert native Noto font definition to LaTeX"""

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fontmap = dict()
        fm = createFontMapping(['Noto'])
        if revert_fonts(document, fm, fontmap):
            add_preamble_fonts(document, fontmap)

def convert_latexFonts(document):
    """Handle DejaVu and IBMPlex fonts definition to LaTeX"""

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fm = createFontMapping(['DejaVu', 'IBM'])
        convert_fonts(document, fm)

def revert_latexFonts(document):
    """Revert native DejaVu font definition to LaTeX"""

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fontmap = dict()
        fm = createFontMapping(['DejaVu', 'IBM'])
        if revert_fonts(document, fm, fontmap):
            add_preamble_fonts(document, fontmap)

def convert_AdobeFonts(document):
    """Handle Adobe Source fonts definition to LaTeX"""

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fm = createFontMapping(['Adobe'])
        convert_fonts(document, fm)

def revert_AdobeFonts(document):
    """Revert Adobe Source font definition to LaTeX"""

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fontmap = dict()
        fm = createFontMapping(['Adobe'])
        if revert_fonts(document, fm, fontmap):
            add_preamble_fonts(document, fontmap)

def removeFrontMatterStyles(document):
    """Remove styles Begin/EndFrontmatter"""

    layouts = ['BeginFrontmatter', 'EndFrontmatter']
    tokenend = len('\\begin_layout ')
    i = 0
    while True:
        i = find_token_exact(document.body, '\\begin_layout ', i+1)
        if i == -1:
            return
        layout = document.body[i][tokenend:].strip()
        if layout not in layouts:
            continue
        j = find_end_of_layout(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Can't find end of layout at line %d" % i)
            continue
        while document.body[j+1].strip() == '':
            j += 1
        document.body[i:j+1] = []

def addFrontMatterStyles(document):
    """Use styles Begin/EndFrontmatter for elsarticle"""

    if document.textclass != "elsarticle":
        return

    def insertFrontmatter(prefix, line):
        above = line
        while above > 0 and document.body[above-1].strip() == '':
            above -= 1
        below = line
        while document.body[below].strip() == '':
            below += 1
        document.body[above:below] = ['', '\\begin_layout ' + prefix + 'Frontmatter',
                                    '\\begin_inset Note Note',
                                    'status open', '',
                                    '\\begin_layout Plain Layout',
                                    'Keep this empty!',
                                    '\\end_layout', '',
                                    '\\end_inset', '', '',
                                    '\\end_layout', '']

    layouts = ['Title', 'Title footnote', 'Author', 'Author footnote',
                'Corresponding author', 'Address', 'Email', 'Abstract', 'Keywords']
    tokenend = len('\\begin_layout ')
    first = -1
    i = 0
    while True:
        i = find_token_exact(document.body, '\\begin_layout ', i+1)
        if i == -1:
            break
        layout = document.body[i][tokenend:].strip()
        if layout not in layouts:
            continue
        k = find_end_of_layout(document.body, i)
        if k == -1:
            document.warning("Malformed LyX document: Can't find end of layout at line %d" % i)
            continue
        if first == -1:
            first = i
        i = k
    if first == -1:
        return
    insertFrontmatter('End', k+1)
    insertFrontmatter('Begin', first)


def convert_lst_literalparam(document):
    """Add param literal to include inset"""

    i = 0
    while True:
        i = find_token(document.body, '\\begin_inset CommandInset include', i+1)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Can't find end of command inset at line %d" % i)
            continue
        while i < j and document.body[i].strip() != '':
            i += 1
        document.body.insert(i, 'literal "true"')


def revert_lst_literalparam(document):
    """Remove param literal from include inset"""

    i = 0
    while True:
        i = find_token(document.body, '\\begin_inset CommandInset include', i+1)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Can't find end of include inset at line %d" % i)
            continue
        del_token(document.body, 'literal', i, j)


def revert_paratype(document):
    """Revert ParaType font definitions to LaTeX"""

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        preamble = ""
        i1 = find_token(document.header, "\\font_roman \"PTSerif-TLF\"", 0)
        i2 = find_token(document.header, "\\font_sans \"default\"", 0)
        i3 = find_token(document.header, "\\font_typewriter \"default\"", 0)
        j = find_token(document.header, "\\font_sans \"PTSans-TLF\"", 0)

        sf_scale = 100.0
        sfval = find_token(document.header, "\\font_sf_scale", 0)
        if sfval == -1:
            document.warning("Malformed LyX document: Missing \\font_sf_scale.")
        else:
            sfscale = document.header[sfval].split()
            val = sfscale[1]
            sfscale[1] = "100"
            document.header[sfval] = " ".join(sfscale)
            try:
                # float() can throw
                sf_scale = float(val)
            except:
                document.warning("Invalid font_sf_scale value: " + val)

        sfoption = ""
        if sf_scale != "100.0":
            sfoption = "scaled=" + str(sf_scale / 100.0)
        k = find_token(document.header, "\\font_typewriter \"PTMono-TLF\"", 0)
        ttval = get_value(document.header, "\\font_tt_scale", 0)
        # cutoff " 100"
        ttval = ttval[:-4]
        ttoption = ""
        if ttval != "100":
            ttoption = "scaled=" + format(float(ttval) / 100, '.2f')
        if i1 != -1 and i2 != -1 and i3!= -1:
            add_to_preamble(document, ["\\usepackage{paratype}"])
        else:
            if i1!= -1:
                add_to_preamble(document, ["\\usepackage{PTSerif}"])
                document.header[i1] = document.header[i1].replace("PTSerif-TLF", "default")
            if j!= -1:
                if sfoption != "":
                    add_to_preamble(document, ["\\usepackage[" + sfoption + "]{PTSans}"])
                else:
                    add_to_preamble(document, ["\\usepackage{PTSans}"])
                document.header[j] = document.header[j].replace("PTSans-TLF", "default")
            if k!= -1:
                if ttoption != "":
                    add_to_preamble(document, ["\\usepackage[" + ttoption + "]{PTMono}"])
                else:
                    add_to_preamble(document, ["\\usepackage{PTMono}"])
                document.header[k] = document.header[k].replace("PTMono-TLF", "default")


def revert_xcharter(document):
    """Revert XCharter font definitions to LaTeX"""

    i = find_token(document.header, "\\font_roman \"xcharter\"", 0)
    if i == -1:
        return

    # replace unsupported font setting
    document.header[i] = document.header[i].replace("xcharter", "default")
    # no need for preamble code with system fonts
    if get_bool_value(document.header, "\\use_non_tex_fonts"):
        return

    # transfer old style figures setting to package options
    j = find_token(document.header, "\\font_osf true")
    if j != -1:
        options = "[osf]"
        document.header[j] = "\\font_osf false"
    else:
        options = ""
    if i != -1:
        add_to_preamble(document, ["\\usepackage%s{XCharter}"%options])


def revert_lscape(document):
    """Reverts the landscape environment (Landscape module) to TeX-code"""

    if not "landscape" in document.get_module_list():
        return

    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Flex Landscape", i+1)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Can't find end of Landscape inset")
            continue

        if document.body[i] == "\\begin_inset Flex Landscape (Floating)":
            document.body[j - 2 : j + 1] = put_cmd_in_ert("\\end{landscape}}")
            document.body[i : i + 4] = put_cmd_in_ert("\\afterpage{\\begin{landscape}")
            add_to_preamble(document, ["\\usepackage{afterpage}"])
        else:
            document.body[j - 2 : j + 1] = put_cmd_in_ert("\\end{landscape}")
            document.body[i : i + 4] = put_cmd_in_ert("\\begin{landscape}")

        add_to_preamble(document, ["\\usepackage{pdflscape}"])
    document.del_module("landscape")


def convert_fontenc(document):
    """Convert default fontenc setting"""

    i = find_token(document.header, "\\fontencoding global", 0)
    if i == -1:
        return

    document.header[i] = document.header[i].replace("global", "auto")


def revert_fontenc(document):
    """Revert default fontenc setting"""

    i = find_token(document.header, "\\fontencoding auto", 0)
    if i == -1:
        return

    document.header[i] = document.header[i].replace("auto", "global")


def revert_nospellcheck(document):
    """Remove nospellcheck font info param"""

    i = 0
    while True:
        i = find_token(document.body, '\\nospellcheck', i)
        if i == -1:
            return
        del document.body[i]


def revert_floatpclass(document):
    """Remove float placement params 'document' and 'class'"""

    del_token(document.header, "\\float_placement class")

    i = 0
    while True:
        i = find_token(document.body, '\\begin_inset Float', i + 1)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        k = find_token(document.body, 'placement class', i, j)
        if k == -1:
            k = find_token(document.body, 'placement document', i, j)
            if k != -1:
                del document.body[k]
            continue
        del document.body[k]


def revert_floatalignment(document):
    """Remove float alignment params"""

    galignment = get_value(document.header, "\\float_alignment", delete=True)

    i = 0
    while True:
        i = find_token(document.body, '\\begin_inset Float', i + 1)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Can't find end of inset at line " + str(i))
            continue
        k = find_token(document.body, 'alignment', i, j)
        if k == -1:
            i = j
            continue
        alignment = get_value(document.body, "alignment", k)
        if alignment == "document":
            alignment = galignment
        del document.body[k]
        l = find_token(document.body, "\\begin_layout Plain Layout", i, j)
        if l == -1:
            document.warning("Can't find float layout!")
            continue
        alcmd = []
        if alignment == "left":
            alcmd = put_cmd_in_ert("\\raggedright{}")
        elif alignment == "center":
            alcmd = put_cmd_in_ert("\\centering{}")
        elif alignment == "right":
            alcmd = put_cmd_in_ert("\\raggedleft{}")
        if len(alcmd) > 0:
            document.body[l+1:l+1] = alcmd
        # There might be subfloats, so we do not want to move past
        # the end of the inset.
        i += 1

def revert_tuftecite(document):
    r"""Revert \cite commands in tufte classes"""

    tufte = ["tufte-book", "tufte-handout"]
    if document.textclass not in tufte:
        return

    i = 0
    while (True):
        i = find_token(document.body, "\\begin_inset CommandInset citation", i+1)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Can't find end of citation inset at line %d!!" %(i))
            continue
        k = find_token(document.body, "LatexCommand", i, j)
        if k == -1:
            document.warning("Can't find LatexCommand for citation inset at line %d!" %(i))
            i = j
            continue
        cmd = get_value(document.body, "LatexCommand", k)
        if cmd != "cite":
            i = j
            continue
        pre = get_quoted_value(document.body, "before", i, j)
        post = get_quoted_value(document.body, "after", i, j)
        key = get_quoted_value(document.body, "key", i, j)
        if not key:
            document.warning("Citation inset at line %d does not have a key!" %(i))
            key = "???"
        # Replace command with ERT
        res = "\\cite"
        if pre:
            res += "[" + pre + "]"
        if post:
            res += "[" + post + "]"
        elif pre:
            res += "[]"
        res += "{" + key + "}"
        document.body[i:j+1] = put_cmd_in_ert([res])
        i = j



def revert_stretchcolumn(document):
    """We remove the column varwidth flags or everything else will become a mess."""
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Tabular", i+1)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i+1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of tabular.")
            continue
        for k in range(i, j):
            if re.search('^<column.*varwidth="[^"]+".*>$', document.body[k]):
                document.warning("Converting 'tabularx'/'xltabular' table to normal table.")
                document.body[k] = document.body[k].replace(' varwidth="true"', '')


def revert_vcolumns(document):
    """Revert standard columns with line breaks etc."""
    i = 0
    needvarwidth = False
    needarray = False
    try:
        while True:
            i = find_token(document.body, "\\begin_inset Tabular", i+1)
            if i == -1:
                return
            j = find_end_of_inset(document.body, i)
            if j == -1:
                document.warning("Malformed LyX document: Could not find end of tabular.")
                continue

            # Collect necessary column information
            m = i + 1
            nrows = int(document.body[i+1].split('"')[3])
            ncols = int(document.body[i+1].split('"')[5])
            col_info = []
            for k in range(ncols):
                m = find_token(document.body, "<column", m)
                width = get_option_value(document.body[m], 'width')
                varwidth = get_option_value(document.body[m], 'varwidth')
                alignment = get_option_value(document.body[m], 'alignment')
                special = get_option_value(document.body[m], 'special')
                col_info.append([width, varwidth, alignment, special, m])

            # Now parse cells
            m = i + 1
            lines = []
            for row in range(nrows):
                for col in range(ncols):
                    m = find_token(document.body, "<cell", m)
                    multicolumn = get_option_value(document.body[m], 'multicolumn')
                    multirow = get_option_value(document.body[m], 'multirow')
                    width = get_option_value(document.body[m], 'width')
                    rotate = get_option_value(document.body[m], 'rotate')
                    # Check for: linebreaks, multipars, non-standard environments
                    begcell = m
                    endcell = find_token(document.body, "</cell>", begcell)
                    vcand = False
                    if find_token(document.body, "\\begin_inset Newline", begcell, endcell) != -1:
                        vcand = True
                    elif count_pars_in_inset(document.body, begcell + 2) > 1:
                        vcand = True
                    elif get_value(document.body, "\\begin_layout", begcell) != "Plain Layout":
                        vcand = True
                    if vcand and rotate == "" and ((multicolumn == "" and multirow == "") or width == ""):
                        if col_info[col][0] == "" and col_info[col][1] == "" and col_info[col][3] == "":
                            needvarwidth = True
                            alignment = col_info[col][2]
                            col_line = col_info[col][4]
                            vval = ""
                            if alignment == "center":
                                vval = ">{\\centering}"
                            elif  alignment == "left":
                                vval = ">{\\raggedright}"
                            elif alignment == "right":
                                vval = ">{\\raggedleft}"
                            if vval != "":
                                needarray = True
                            vval += "V{\\linewidth}"

                            document.body[col_line] = document.body[col_line][:-1] + " special=\"" + vval + "\">"
                            # ERT newlines and linebreaks (since LyX < 2.4 automatically inserts parboxes
                            # with newlines, and we do not want that)
                            while True:
                                endcell = find_token(document.body, "</cell>", begcell)
                                linebreak = False
                                nl = find_token(document.body, "\\begin_inset Newline newline", begcell, endcell)
                                if nl == -1:
                                    nl = find_token(document.body, "\\begin_inset Newline linebreak", begcell, endcell)
                                    if nl == -1:
                                         break
                                    linebreak = True
                                nle = find_end_of_inset(document.body, nl)
                                del(document.body[nle:nle+1])
                                if linebreak:
                                    document.body[nl:nl+1] = put_cmd_in_ert("\\linebreak{}")
                                else:
                                    document.body[nl:nl+1] = put_cmd_in_ert("\\\\")
                    m += 1

            i = j

    finally:
        if needarray == True:
            add_to_preamble(document, ["\\usepackage{array}"])
        if needvarwidth == True:
            add_to_preamble(document, ["\\usepackage{varwidth}"])


def revert_bibencoding(document):
    """Revert bibliography encoding"""

    # Get cite engine
    engine = "basic"
    i = find_token(document.header, "\\cite_engine", 0)
    if i == -1:
        document.warning("Malformed document! Missing \\cite_engine")
    else:
        engine = get_value(document.header, "\\cite_engine", i)

    # Check if biblatex
    biblatex = False
    if engine in ["biblatex", "biblatex-natbib"]:
        biblatex = True

    # Map lyx to latex encoding names
    encodings = {
        "utf8" : "utf8",
        "utf8x" : "utf8x",
        "armscii8" : "armscii8",
        "iso8859-1" : "latin1",
        "iso8859-2" : "latin2",
        "iso8859-3" : "latin3",
        "iso8859-4" : "latin4",
        "iso8859-5" : "iso88595",
        "iso8859-6" : "8859-6",
        "iso8859-7" : "iso-8859-7",
        "iso8859-8" : "8859-8",
        "iso8859-9" : "latin5",
        "iso8859-13" : "latin7",
        "iso8859-15" : "latin9",
        "iso8859-16" : "latin10",
        "applemac" : "applemac",
        "cp437" : "cp437",
        "cp437de" : "cp437de",
        "cp850" : "cp850",
        "cp852" : "cp852",
        "cp855" : "cp855",
        "cp858" : "cp858",
        "cp862" : "cp862",
        "cp865" : "cp865",
        "cp866" : "cp866",
        "cp1250" : "cp1250",
        "cp1251" : "cp1251",
        "cp1252" : "cp1252",
        "cp1255" : "cp1255",
        "cp1256" : "cp1256",
        "cp1257" : "cp1257",
        "koi8-r" : "koi8-r",
        "koi8-u" : "koi8-u",
        "pt154" : "pt154",
        "utf8-platex" : "utf8",
        "ascii" : "ascii"
    }

    i = 0
    bibresources = []
    while (True):
        i = find_token(document.body, "\\begin_inset CommandInset bibtex", i+1)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Can't find end of bibtex inset at line %d!!" %(i))
            continue
        encoding = get_quoted_value(document.body, "encoding", i, j)
        if not encoding:
            continue
        # remove encoding line
        k = find_token(document.body, "encoding", i, j)
        if k != -1:
            del document.body[k]
        if encoding == "default":
            continue
        # Re-find inset end line
        j = find_end_of_inset(document.body, i)
        if biblatex:
            biblio_options = ""
            h = find_token(document.header, "\\biblio_options", 0)
            if h != -1:
                biblio_options = get_value(document.header, "\\biblio_options", h)
                if not "bibencoding" in biblio_options:
                     document.header[h] += ",bibencoding=%s" % encodings[encoding]
            else:
                bs = find_token(document.header, "\\biblatex_bibstyle", 0)
                if bs == -1:
                    # this should not happen
                    document.warning("Malformed LyX document! No \\biblatex_bibstyle header found!")
                else:
                    document.header[bs-1 : bs-1] = ["\\biblio_options bibencoding=" + encodings[encoding]]
        else:
            document.body[j+1:j+1] = put_cmd_in_ert("\\egroup")
            document.body[i:i] = put_cmd_in_ert("\\bgroup\\inputencoding{" + encodings[encoding] + "}")

        i = j



def convert_vcsinfo(document):
    """Separate vcs Info inset from buffer Info inset."""

    types = {
        "vcs-revision" : "revision",
        "vcs-tree-revision" : "tree-revision",
        "vcs-author" : "author",
        "vcs-time" : "time",
        "vcs-date" : "date"
    }
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Info", i+1)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i+1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of Info inset.")
            continue
        tp = find_token(document.body, 'type', i, j)
        tpv = get_quoted_value(document.body, "type", tp)
        if tpv != "buffer":
            continue
        arg = find_token(document.body, 'arg', i, j)
        argv = get_quoted_value(document.body, "arg", arg)
        if argv not in list(types.keys()):
            continue
        document.body[tp] = "type \"vcs\""
        document.body[arg] = "arg \"" + types[argv] + "\""


def revert_vcsinfo(document):
    """Merge vcs Info inset to buffer Info inset."""

    args = ["revision", "tree-revision", "author", "time", "date" ]
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Info", i+1)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i+1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of Info inset.")
            continue
        tp = find_token(document.body, 'type', i, j)
        tpv = get_quoted_value(document.body, "type", tp)
        if tpv != "vcs":
            continue
        arg = find_token(document.body, 'arg', i, j)
        argv = get_quoted_value(document.body, "arg", arg)
        if argv not in args:
            document.warning("Malformed Info inset. Invalid vcs arg.")
            continue
        document.body[tp] = "type \"buffer\""
        document.body[arg] = "arg \"vcs-" + argv + "\""

def revert_vcsinfo_rev_abbrev(document):
    " Convert abbreviated revisions to regular revisions. "

    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Info", i+1)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i+1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of Info inset.")
            continue
        tp = find_token(document.body, 'type', i, j)
        tpv = get_quoted_value(document.body, "type", tp)
        if tpv != "vcs":
            continue
        arg = find_token(document.body, 'arg', i, j)
        argv = get_quoted_value(document.body, "arg", arg)
        if( argv == "revision-abbrev" ):
            document.body[arg] = "arg \"revision\""

def revert_dateinfo(document):
    """Revert date info insets to static text."""

# FIXME This currently only considers the main language and uses the system locale
# Ideally, it should honor context languages and switch the locale accordingly.

    # The date formats for each language using strftime syntax:
    # long, short, loclong, locmedium, locshort
    dateformats = {
        "afrikaans" : ["%A, %d %B %Y", "%Y-%m-%d", "%d %B %Y", "%d %b %Y", "%Y/%m/%d"],
        "albanian" : ["%A, %d %B %Y", "%d.%m.%y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "american" : ["%A, %B %d, %Y", "%m/%d/%y", "%B %d, %Y", "%b %d, %Y", "%m/%d/%Y"],
        "amharic" : ["%A ፣%d %B %Y", "%d/%m/%Y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "ancientgreek" : ["%A, %d %B %Y", "%d %b %Y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "arabic_arabi" : ["%A، %d %B، %Y", "%d‏/%m‏/%Y", "%d %B، %Y", "%d/%m/%Y", "%d/%m/%Y"],
        "arabic_arabtex" : ["%A، %d %B، %Y", "%d‏/%m‏/%Y", "%d %B، %Y", "%d/%m/%Y", "%d/%m/%Y"],
        "armenian" : ["%Y թ. %B %d, %A", "%d.%m.%y", "%d %B، %Y", "%d %b، %Y", "%d/%m/%Y"],
        "asturian" : ["%A, %d %B de %Y", "%d/%m/%y", "%d de %B de %Y", "%d %b %Y", "%d/%m/%Y"],
        "australian" : ["%A, %d %B %Y", "%d/%m/%y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "austrian" : ["%A, %d. %B %Y", "%d.%m.%y", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "bahasa" : ["%A, %d %B %Y", "%d/%m/%y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "bahasam" : ["%A, %d %B %Y", "%d/%m/%y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "basque" : ["%Y(e)ko %B %d, %A", "%y/%m/%d", "%Y %B %d", "%Y %b %d", "%Y/%m/%d"],
        "belarusian" : ["%A, %d %B %Y г.", "%d.%m.%y", "%d %B %Y", "%d %b %Y", "%d.%m.%Y"],
        "bosnian" : ["%A, %d. %B %Y.", "%d.%m.%y.", "%d. %B %Y", "%d. %b %Y", "%Y-%m-%d"],
        "brazilian" : ["%A, %d de %B de %Y", "%d/%m/%Y", "%d de %B de %Y", "%d de %b de %Y", "%d/%m/%Y"],
        "breton" : ["%Y %B %d, %A", "%Y-%m-%d", "%d %B %Y", "%d %b %Y", "%Y-%m-%d"],
        "british" : ["%A, %d %B %Y", "%d/%m/%Y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "bulgarian" : ["%A, %d %B %Y г.", "%d.%m.%y г.", "%d %B %Y", "%d %b %Y", "%Y-%m-%d"],
        "canadian" : ["%A, %B %d, %Y", "%Y-%m-%d", "%B %d, %Y", "%d %b %Y", "%Y-%m-%d"],
        "canadien" : ["%A %d %B %Y", "%y-%m-%d", "%d %B %Y", "%d %b %Y", "%Y-%m-%d"],
        "catalan" : ["%A, %d %B de %Y", "%d/%m/%y", "%d / %B / %Y", "%d / %b / %Y", "%d/%m/%Y"],
        "chinese-simplified" : ["%Y年%m月%d日%A", "%Y/%m/%d", "%Y年%m月%d日", "%Y-%m-%d", "%y-%m-%d"],
        "chinese-traditional" : ["%Y年%m月%d日 %A", "%Y/%m/%d", "%Y年%m月%d日", "%Y年%m月%d日", "%y年%m月%d日"],
        "coptic" : ["%A, %d %B %Y", "%d %b %Y", "%B %d, %Y", "%b %d, %Y", "%m/%d/%Y"],
        "croatian" : ["%A, %d. %B %Y.", "%d. %m. %Y.", "%d. %B %Y.", "%d. %b. %Y.", "%d.%m.%Y."],
        "czech" : ["%A %d. %B %Y", "%d.%m.%y", "%d. %B %Y", "%d. %b. %Y", "%d.%m.%Y"],
        "danish" : ["%A den %d. %B %Y", "%d/%m/%Y", "%d. %B %Y", "%d. %b %Y", "%d/%m/%Y"],
        "divehi" : ["%Y %B %d, %A", "%Y-%m-%d", "%Y %B %d", "%Y %b %d", "%d/%m/%Y"],
        "dutch" : ["%A %d %B %Y", "%d-%m-%y", "%d %B %Y", "%d %b %Y", "%d-%m-%Y"],
        "english" : ["%A, %B %d, %Y", "%m/%d/%y", "%B %d, %Y", "%b %d, %Y", "%m/%d/%Y"],
        "esperanto" : ["%A, %d %B %Y", "%d %b %Y", "la %d de %B %Y", "la %d de %b %Y", "%m/%d/%Y"],
        "estonian" : ["%A, %d. %B %Y", "%d.%m.%y", "%d %B %Y", "%d %b %Y", "%d.%m.%Y"],
        "farsi" : ["%A %d %B %Y", "%Y/%m/%d", "%d %B %Y", "%d %b %Y", "%Y/%m/%d"],
        "finnish" : ["%A %d. %B %Y", "%d.%m.%Y", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "french" : ["%A %d %B %Y", "%d/%m/%Y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "friulan" : ["%A %d di %B dal %Y", "%d/%m/%y", "%d di %B dal %Y", "%d di %b dal %Y", "%d/%m/%Y"],
        "galician" : ["%A, %d de %B de %Y", "%d/%m/%y", "%d de %B de %Y", "%d de %b de %Y", "%d/%m/%Y"],
        "georgian" : ["%A, %d %B, %Y", "%d.%m.%y", "%B %d, %Y", "%b %d, %Y", "%m/%d/%Y"],
        "german" : ["%A, %d. %B %Y", "%d.%m.%y", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "german-ch" : ["%A, %d. %B %Y", "%d.%m.%y", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "german-ch-old" : ["%A, %d. %B %Y", "%d.%m.%y", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "greek" : ["%A, %d %B %Y", "%d/%m/%y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "hebrew" : ["%A, %d ב%B %Y", "%d.%m.%Y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "hindi" : ["%A, %d %B %Y", "%d/%m/%y", "%d %B %Y", "%d %b %Y", "%d-%m-%Y"],
        "icelandic" : ["%A, %d. %B %Y", "%d.%m.%Y", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "interlingua" : ["%Y %B %d, %A", "%Y-%m-%d", "le %d de %B %Y", "le %d de %b %Y", "%Y-%m-%d"],
        "irish" : ["%A %d %B %Y", "%d/%m/%Y", "%d. %B %Y", "%d. %b %Y", "%d/%m/%Y"],
        "italian" : ["%A %d %B %Y", "%d/%m/%y", "%d %B %Y", "%d/%b/%Y", "%d/%m/%Y"],
        "japanese" : ["%Y年%m月%d日%A", "%Y/%m/%d", "%Y年%m月%d日", "%Y/%m/%d", "%y/%m/%d"],
        "japanese-cjk" : ["%Y年%m月%d日%A", "%Y/%m/%d", "%Y年%m月%d日", "%Y/%m/%d", "%y/%m/%d"],
        "kannada" : ["%A, %B %d, %Y", "%d/%m/%y", "%d %B %Y", "%d %B %Y", "%d-%m-%Y"],
        "kazakh" : ["%Y ж. %d %B, %A", "%d.%m.%y", "%d %B %Y", "%d %B %Y", "%Y-%d-%m"],
        "khmer" : ["%A %d %B %Y", "%d/%m/%y", "%d %B %Y", "%d %B %Y", "%d/%m/%Y"],
        "korean" : ["%Y년 %m월 %d일 %A", "%y. %m. %d.", "%Y년 %m월 %d일", "%Y. %m. %d.", "%y. %m. %d."],
        "kurmanji" : ["%A, %d %B %Y", "%d %b %Y", "%d. %B %Y", "%d. %m. %Y", "%Y-%m-%d"],
        "lao" : ["%A ທີ %d %B %Y", "%d/%m/%Y", "%d %B %Y", "%d %B %Y", "%d/%m/%Y"],
        "latin" : ["%A, %d %B %Y", "%d %b %Y", "%B %d, %Y", "%b %d, %Y", "%m/%d/%Y"],
        "latvian" : ["%A, %Y. gada %d. %B", "%d.%m.%y", "%Y. gada %d. %B", "%Y. gada %d. %b", "%d.%m.%Y"],
        "lithuanian" : ["%Y m. %B %d d., %A", "%Y-%m-%d", "%Y m. %B %d d.", "%Y m. %B %d d.", "%Y-%m-%d"],
        "lowersorbian" : ["%A, %d. %B %Y", "%d.%m.%y", "%d %B %Y", "%d %b %Y", "%d.%m.%Y"],
        "macedonian" : ["%A, %d %B %Y", "%d.%m.%y", "%d %B %Y", "%d %b %Y", "%d.%m.%Y"],
        "magyar" : ["%Y. %B %d., %A", "%Y. %m. %d.", "%Y. %B %d.", "%Y. %b %d.", "%Y.%m.%d."],
        "malayalam" : ["%A, %d %B, %Y", "%d/%m/%y", "%d %B %Y", "%d %b %Y", "%d-%m-%Y"],
        "marathi" : ["%A, %d %B, %Y", "%d/%m/%y", "%d %B %Y", "%d %b %Y", "%d-%m-%Y"],
        "mongolian" : ["%A, %Y оны %m сарын %d", "%Y-%m-%d", "%Y оны %m сарын %d", "%d-%m-%Y", "%d-%m-%Y"],
        "naustrian" : ["%A, %d. %B %Y", "%d.%m.%y", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "newzealand" : ["%A, %d %B %Y", "%d/%m/%y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "ngerman" : ["%A, %d. %B %Y", "%d.%m.%y", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "norsk" : ["%A %d. %B %Y", "%d.%m.%Y", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "nynorsk" : ["%A %d. %B %Y", "%d.%m.%Y", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "occitan" : ["%Y %B %d, %A", "%Y-%m-%d", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "piedmontese" : ["%A, %d %B %Y", "%d %b %Y", "%B %d, %Y", "%b %d, %Y", "%m/%d/%Y"],
        "polish" : ["%A, %d %B %Y", "%d.%m.%Y", "%d %B %Y", "%d %b %Y", "%Y-%m-%d"],
        "polutonikogreek" : ["%A, %d %B %Y", "%d/%m/%y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "portuguese" : ["%A, %d de %B de %Y", "%d/%m/%y", "%d de %B de %Y", "%d de %b de %Y", "%Y/%m/%d"],
        "romanian" : ["%A, %d %B %Y", "%d.%m.%Y", "%d %B %Y", "%d %b %Y", "%d.%m.%Y"],
        "romansh" : ["%A, ils %d da %B %Y", "%d-%m-%y", "%d %B %Y", "%d %b %Y", "%d.%m.%Y"],
        "russian" : ["%A, %d %B %Y г.", "%d.%m.%Y", "%d %B %Y г.", "%d %b %Y г.", "%d.%m.%Y"],
        "samin" : ["%Y %B %d, %A", "%Y-%m-%d", "%B %d. b. %Y", "%b %d. b. %Y", "%d.%m.%Y"],
        "sanskrit" : ["%Y %B %d, %A", "%Y-%m-%d", "%d %B %Y", "%d %b %Y", "%d-%m-%Y"],
        "scottish" : ["%A, %dmh %B %Y", "%d/%m/%Y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "serbian" : ["%A, %d. %B %Y.", "%d.%m.%y.", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "serbian-latin" : ["%A, %d. %B %Y.", "%d.%m.%y.", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "slovak" : ["%A, %d. %B %Y", "%d. %m. %Y", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "slovene" : ["%A, %d. %B %Y", "%d. %m. %y", "%d. %B %Y", "%d. %b %Y", "%d.%m.%Y"],
        "spanish" : ["%A, %d de %B de %Y", "%d/%m/%y", "%d de %B %de %Y", "%d %b %Y", "%d/%m/%Y"],
        "spanish-mexico" : ["%A, %d de %B %de %Y", "%d/%m/%y", "%d de %B de %Y", "%d %b %Y", "%d/%m/%Y"],
        "swedish" : ["%A %d %B %Y", "%Y-%m-%d", "%d %B %Y", "%d %b %Y", "%Y-%m-%d"],
        "syriac" : ["%Y %B %d, %A", "%Y-%m-%d", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "tamil" : ["%A, %d %B, %Y", "%d/%m/%y", "%d %B %Y", "%d %b %Y", "%d-%m-%Y"],
        "telugu" : ["%d, %B %Y, %A", "%d-%m-%y", "%d %B %Y", "%d %b %Y", "%d-%m-%Y"],
        "thai" : ["%Aที่ %d %B %Y", "%d/%m/%y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
        "tibetan" : ["%Y %Bའི་ཚེས་%d, %A", "%Y-%m-%d", "%B %d, %Y", "%b %d, %Y", "%m/%d/%Y"],
        "turkish" : ["%d %B %Y %A", "%d.%m.%Y", "%d %B %Y", "%d.%b.%Y", "%d.%m.%Y"],
        "turkmen" : ["%d %B %Y %A", "%d.%m.%Y", "%Y ý. %B %d", "%d.%m.%Y ý.", "%d.%m.%y ý."],
        "ukrainian" : ["%A, %d %B %Y р.", "%d.%m.%y", "%d %B %Y", "%d %m %Y", "%d.%m.%Y"],
        "uppersorbian" : ["%A, %d. %B %Y", "%d.%m.%y", "%d %B %Y", "%d %b %Y", "%d.%m.%Y"],
        "urdu" : ["%A، %d %B، %Y", "%d/%m/%y", "%d %B, %Y", "%d %b %Y", "%d/%m/%Y"],
        "vietnamese" : ["%A, %d %B, %Y", "%d/%m/%Y", "%d tháng %B %Y", "%d-%m-%Y", "%d/%m/%Y"],
        "welsh" : ["%A, %d %B %Y", "%d/%m/%y", "%d %B %Y", "%d %b %Y", "%d/%m/%Y"],
    }

    types = ["date", "fixdate", "moddate" ]
    lang = get_value(document.header, "\\language")
    if lang == "":
        document.warning("Malformed LyX document! No \\language header found!")
        return

    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Info", i+1)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i+1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of Info inset.")
            continue
        tp = find_token(document.body, 'type', i, j)
        tpv = get_quoted_value(document.body, "type", tp)
        if tpv not in types:
            continue
        arg = find_token(document.body, 'arg', i, j)
        argv = get_quoted_value(document.body, "arg", arg)
        isodate = ""
        dte = date.today()
        if tpv == "fixdate":
            datecomps = argv.split('@')
            if len(datecomps) > 1:
                argv = datecomps[0]
                isodate = datecomps[1]
                m = re.search(r'(\d\d\d\d)-(\d\d)-(\d\d)', isodate)
                if m:
                    dte = date(int(m.group(1)), int(m.group(2)), int(m.group(3)))
# FIXME if we had the path to the original document (not the one in the tmp dir),
#        we could use the mtime.
#        elif tpv == "moddate":
#            dte = date.fromtimestamp(os.path.getmtime(document.dir))
        result = ""
        if argv == "ISO":
            result = dte.isodate()
        elif argv == "long":
            result = dte.strftime(dateformats[lang][0])
        elif argv == "short":
            result = dte.strftime(dateformats[lang][1])
        elif argv == "loclong":
            result = dte.strftime(dateformats[lang][2])
        elif argv == "locmedium":
            result = dte.strftime(dateformats[lang][3])
        elif argv == "locshort":
            result = dte.strftime(dateformats[lang][4])
        else:
            fmt = argv.replace("MMMM", "%b").replace("MMM", "%b").replace("MM", "%m").replace("M", "%m")
            fmt = fmt.replace("yyyy", "%Y").replace("yy", "%y")
            fmt = fmt.replace("dddd", "%A").replace("ddd", "%a").replace("dd", "%d")
            fmt = re.sub('[^\'%]d', '%d', fmt)
            fmt = fmt.replace("'", "")
            result = dte.strftime(fmt)
        if sys.version_info < (3,0):
            # In Python 2, datetime module works with binary strings,
            # our dateformat strings are utf8-encoded:
            result = result.decode('utf-8')
        document.body[i : j+1] = [result]


def revert_timeinfo(document):
    """Revert time info insets to static text."""

# FIXME This currently only considers the main language and uses the system locale
# Ideally, it should honor context languages and switch the locale accordingly.
# Also, the time object is "naive", i.e., it does not know of timezones (%Z will
# be empty).

    # The time formats for each language using strftime syntax:
    # long, short
    timeformats = {
        "afrikaans" : ["%H:%M:%S %Z", "%H:%M"],
        "albanian" : ["%I:%M:%S %p, %Z", "%I:%M %p"],
        "american" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "amharic" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "ancientgreek" : ["%H:%M:%S %Z", "%H:%M:%S"],
        "arabic_arabi" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "arabic_arabtex" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "armenian" : ["%H:%M:%S %Z", "%H:%M"],
        "asturian" : ["%H:%M:%S %Z", "%H:%M"],
        "australian" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "austrian" : ["%H:%M:%S %Z", "%H:%M"],
        "bahasa" : ["%H.%M.%S %Z", "%H.%M"],
        "bahasam" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "basque" : ["%H:%M:%S (%Z)", "%H:%M"],
        "belarusian" : ["%H:%M:%S, %Z", "%H:%M"],
        "bosnian" : ["%H:%M:%S %Z", "%H:%M"],
        "brazilian" : ["%H:%M:%S %Z", "%H:%M"],
        "breton" : ["%H:%M:%S %Z", "%H:%M"],
        "british" : ["%H:%M:%S %Z", "%H:%M"],
        "bulgarian" : ["%H:%M:%S %Z", "%H:%M"],
        "canadian" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "canadien" : ["%H:%M:%S %Z", "%H h %M"],
        "catalan" : ["%H:%M:%S %Z", "%H:%M"],
        "chinese-simplified" : ["%Z %p%I:%M:%S", "%p%I:%M"],
        "chinese-traditional" : ["%p%I:%M:%S [%Z]", "%p%I:%M"],
        "coptic" : ["%H:%M:%S %Z", "%H:%M:%S"],
        "croatian" : ["%H:%M:%S (%Z)", "%H:%M"],
        "czech" : ["%H:%M:%S %Z", "%H:%M"],
        "danish" : ["%H.%M.%S %Z", "%H.%M"],
        "divehi" : ["%H:%M:%S %Z", "%H:%M"],
        "dutch" : ["%H:%M:%S %Z", "%H:%M"],
        "english" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "esperanto" : ["%H:%M:%S %Z", "%H:%M:%S"],
        "estonian" : ["%H:%M:%S %Z", "%H:%M"],
        "farsi" : ["%H:%M:%S (%Z)", "%H:%M"],
        "finnish" : ["%H.%M.%S %Z", "%H.%M"],
        "french" : ["%H:%M:%S %Z", "%H:%M"],
        "friulan" : ["%H:%M:%S %Z", "%H:%M"],
        "galician" : ["%H:%M:%S %Z", "%H:%M"],
        "georgian" : ["%H:%M:%S %Z", "%H:%M"],
        "german" : ["%H:%M:%S %Z", "%H:%M"],
        "german-ch" : ["%H:%M:%S %Z", "%H:%M"],
        "german-ch-old" : ["%H:%M:%S %Z", "%H:%M"],
        "greek" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "hebrew" : ["%H:%M:%S %Z", "%H:%M"],
        "hindi" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "icelandic" : ["%H:%M:%S %Z", "%H:%M"],
        "interlingua" : ["%H:%M:%S %Z", "%H:%M"],
        "irish" : ["%H:%M:%S %Z", "%H:%M"],
        "italian" : ["%H:%M:%S %Z", "%H:%M"],
        "japanese" : ["%H時%M分%S秒 %Z", "%H:%M"],
        "japanese-cjk" : ["%H時%M分%S秒 %Z", "%H:%M"],
        "kannada" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "kazakh" : ["%H:%M:%S %Z", "%H:%M"],
        "khmer" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "korean" : ["%p %I시%M분 %S초 %Z", "%p %I:%M"],
        "kurmanji" : ["%H:%M:%S %Z", "%H:%M:%S"],
        "lao" : ["%H ໂມງ%M ນາທີ  %S ວິນາທີ %Z", "%H:%M"],
        "latin" : ["%H:%M:%S %Z", "%H:%M:%S"],
        "latvian" : ["%H:%M:%S %Z", "%H:%M"],
        "lithuanian" : ["%H:%M:%S %Z", "%H:%M"],
        "lowersorbian" : ["%H:%M:%S %Z", "%H:%M"],
        "macedonian" : ["%H:%M:%S %Z", "%H:%M"],
        "magyar" : ["%H:%M:%S %Z", "%H:%M"],
        "malayalam" : ["%p %I:%M:%S %Z", "%p %I:%M"],
        "marathi" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "mongolian" : ["%H:%M:%S %Z", "%H:%M"],
        "naustrian" : ["%H:%M:%S %Z", "%H:%M"],
        "newzealand" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "ngerman" : ["%H:%M:%S %Z", "%H:%M"],
        "norsk" : ["%H:%M:%S %Z", "%H:%M"],
        "nynorsk" : ["kl. %H:%M:%S %Z", "%H:%M"],
        "occitan" : ["%H:%M:%S %Z", "%H:%M"],
        "piedmontese" : ["%H:%M:%S %Z", "%H:%M:%S"],
        "polish" : ["%H:%M:%S %Z", "%H:%M"],
        "polutonikogreek" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "portuguese" : ["%H:%M:%S %Z", "%H:%M"],
        "romanian" : ["%H:%M:%S %Z", "%H:%M"],
        "romansh" : ["%H:%M:%S %Z", "%H:%M"],
        "russian" : ["%H:%M:%S %Z", "%H:%M"],
        "samin" : ["%H:%M:%S %Z", "%H:%M"],
        "sanskrit" : ["%H:%M:%S %Z", "%H:%M"],
        "scottish" : ["%H:%M:%S %Z", "%H:%M"],
        "serbian" : ["%H:%M:%S %Z", "%H:%M"],
        "serbian-latin" : ["%H:%M:%S %Z", "%H:%M"],
        "slovak" : ["%H:%M:%S %Z", "%H:%M"],
        "slovene" : ["%H:%M:%S %Z", "%H:%M"],
        "spanish" : ["%H:%M:%S (%Z)", "%H:%M"],
        "spanish-mexico" : ["%H:%M:%S %Z", "%H:%M"],
        "swedish" : ["kl. %H:%M:%S %Z", "%H:%M"],
        "syriac" : ["%H:%M:%S %Z", "%H:%M"],
        "tamil" : ["%p %I:%M:%S %Z", "%p %I:%M"],
        "telugu" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "thai" : ["%H นาฬิกา %M นาที  %S วินาที %Z", "%H:%M"],
        "tibetan" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "turkish" : ["%H:%M:%S %Z", "%H:%M"],
        "turkmen" : ["%H:%M:%S %Z", "%H:%M"],
        "ukrainian" : ["%H:%M:%S %Z", "%H:%M"],
        "uppersorbian" : ["%H:%M:%S %Z", "%H:%M hodź."],
        "urdu" : ["%I:%M:%S %p %Z", "%I:%M %p"],
        "vietnamese" : ["%H:%M:%S %Z", "%H:%M"],
        "welsh" : ["%H:%M:%S %Z", "%H:%M"]
    }

    types = ["time", "fixtime", "modtime" ]
    i = find_token(document.header, "\\language", 0)
    if i == -1:
        # this should not happen
        document.warning("Malformed LyX document! No \\language header found!")
        return
    lang = get_value(document.header, "\\language", i)

    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Info", i+1)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i+1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of Info inset.")
            continue
        tp = find_token(document.body, 'type', i, j)
        tpv = get_quoted_value(document.body, "type", tp)
        if tpv not in types:
            continue
        arg = find_token(document.body, 'arg', i, j)
        argv = get_quoted_value(document.body, "arg", arg)
        isotime = ""
        dtme = datetime.now()
        tme = dtme.time()
        if tpv == "fixtime":
            timecomps = argv.split('@')
            if len(timecomps) > 1:
                argv = timecomps[0]
                isotime = timecomps[1]
                m = re.search(r'(\d\d):(\d\d):(\d\d)', isotime)
                if m:
                    tme = time(int(m.group(1)), int(m.group(2)), int(m.group(3)))
                else:
                    m = re.search(r'(\d\d):(\d\d)', isotime)
                    if m:
                        tme = time(int(m.group(1)), int(m.group(2)))
# FIXME if we had the path to the original document (not the one in the tmp dir),
#        we could use the mtime.
#        elif tpv == "moddate":
#            dte = date.fromtimestamp(os.path.getmtime(document.dir))
        result = ""
        if argv == "ISO":
            result = tme.isoformat()
        elif argv == "long":
            result = tme.strftime(timeformats[lang][0])
        elif argv == "short":
            result = tme.strftime(timeformats[lang][1])
        else:
            fmt = argv.replace("HH", "%H").replace("H", "%H").replace("hh", "%I").replace("h", "%I")
            fmt = fmt.replace("mm", "%M").replace("m", "%M").replace("ss", "%S").replace("s", "%S")
            fmt = fmt.replace("zzz", "%f").replace("z", "%f").replace("t", "%Z")
            fmt = fmt.replace("AP", "%p").replace("ap", "%p").replace("A", "%p").replace("a", "%p")
            fmt = fmt.replace("'", "")
            result = dte.strftime(fmt)
        document.body[i : j+1] = result


def revert_namenoextinfo(document):
    """Merge buffer Info inset type name-noext to name."""

    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Info", i+1)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i+1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of Info inset.")
            continue
        tp = find_token(document.body, 'type', i, j)
        tpv = get_quoted_value(document.body, "type", tp)
        if tpv != "buffer":
            continue
        arg = find_token(document.body, 'arg', i, j)
        argv = get_quoted_value(document.body, "arg", arg)
        if argv != "name-noext":
            continue
        document.body[arg] = "arg \"name\""


def revert_l7ninfo(document):
    """Revert l7n Info inset to text."""

    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Info", i+1)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i+1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of Info inset.")
            continue
        tp = find_token(document.body, 'type', i, j)
        tpv = get_quoted_value(document.body, "type", tp)
        if tpv != "l7n":
            continue
        arg = find_token(document.body, 'arg', i, j)
        argv = get_quoted_value(document.body, "arg", arg)
        # remove trailing colons, menu accelerator (|...) and qt accelerator (&), while keeping literal " & "
        argv = argv.rstrip(':').split('|')[0].replace(" & ", "</amp;>").replace("&", "").replace("</amp;>", " & ")
        document.body[i : j+1] = argv


def revert_listpargs(document):
    """Reverts listpreamble arguments to TeX-code"""
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Argument listpreamble:", i+1)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        # Find containing paragraph layout
        parent = get_containing_layout(document.body, i)
        if parent == False:
            document.warning("Malformed LyX document: Can't find parent paragraph layout")
            continue
        parbeg = parent[3]
        beginPlain = find_token(document.body, "\\begin_layout Plain Layout", i)
        endPlain = find_end_of_layout(document.body, beginPlain)
        content = document.body[beginPlain + 1 : endPlain]
        del document.body[i:j+1]
        subst = ["\\begin_inset ERT", "status collapsed", "", "\\begin_layout Plain Layout",
                 "{"] + content + ["}", "\\end_layout", "", "\\end_inset", ""]
        document.body[parbeg : parbeg] = subst


def revert_lformatinfo(document):
    """Revert layout format Info inset to text."""

    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Info", i+1)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i+1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of Info inset.")
            continue
        tp = find_token(document.body, 'type', i, j)
        tpv = get_quoted_value(document.body, "type", tp)
        if tpv != "lyxinfo":
            continue
        arg = find_token(document.body, 'arg', i, j)
        argv = get_quoted_value(document.body, "arg", arg)
        if argv != "layoutformat":
            continue
        # hardcoded for now
        document.body[i : j+1] = "69"


def convert_hebrew_parentheses(document):
    """ Swap opening/closing parentheses in Hebrew text.

    Up to LyX 2.4, "(" was used as closing parenthesis and
    ")" as opening parenthesis for Hebrew in the LyX source.
    """
    # print("convert hebrew parentheses")
    current_languages = [document.language]
    for i, line in enumerate(document.body):
        if line.startswith('\\lang '):
            current_languages[-1] = line.lstrip('\\lang ')
        elif line.startswith('\\begin_layout'):
            current_languages.append(current_languages[-1])
            # print (line, current_languages[-1])
        elif line.startswith('\\end_layout'):
            current_languages.pop()
        elif current_languages[-1] == 'hebrew' and not line.startswith('\\'):
            document.body[i] = line.replace('(','\x00').replace(')','(').replace('\x00',')')


def revert_hebrew_parentheses(document):
    """Store parentheses in Hebrew text reversed"""
    # This only exists to keep the convert/revert naming convention
    convert_hebrew_parentheses(document)


def revert_malayalam(document):
    """Set the document language to English but assure Malayalam output"""

    revert_language(document, "malayalam", "", "malayalam")


def revert_soul(document):
    """Revert soul module flex insets to ERT"""

    flexes = ["Spaceletters", "Strikethrough", "Underline", "Highlight", "Capitalize"]

    for flex in flexes:
        i = find_token(document.body, "\\begin_inset Flex %s" % flex, 0)
        if i != -1:
            add_to_preamble(document, ["\\usepackage{soul}"])
            break
    i = find_token(document.body, "\\begin_inset Flex Highlight", 0)
    if i != -1:
        add_to_preamble(document, ["\\usepackage{color}"])

    revert_flex_inset(document.body, "Spaceletters", "\\so")
    revert_flex_inset(document.body, "Strikethrough", "\\st")
    revert_flex_inset(document.body, "Underline", "\\ul")
    revert_flex_inset(document.body, "Highlight", "\\hl")
    revert_flex_inset(document.body, "Capitalize", "\\caps")


def revert_tablestyle(document):
    """Remove tablestyle params"""

    i = find_token(document.header, "\\tablestyle")
    if i != -1:
        del document.header[i]


def revert_bibfileencodings(document):
    """Revert individual Biblatex bibliography encodings"""

    # Get cite engine
    engine = "basic"
    i = find_token(document.header, "\\cite_engine", 0)
    if i == -1:
        document.warning("Malformed document! Missing \\cite_engine")
    else:
        engine = get_value(document.header, "\\cite_engine", i)

    # Check if biblatex
    biblatex = False
    if engine in ["biblatex", "biblatex-natbib"]:
        biblatex = True

    # Map lyx to latex encoding names
    encodings = {
        "utf8" : "utf8",
        "utf8x" : "utf8x",
        "armscii8" : "armscii8",
        "iso8859-1" : "latin1",
        "iso8859-2" : "latin2",
        "iso8859-3" : "latin3",
        "iso8859-4" : "latin4",
        "iso8859-5" : "iso88595",
        "iso8859-6" : "8859-6",
        "iso8859-7" : "iso-8859-7",
        "iso8859-8" : "8859-8",
        "iso8859-9" : "latin5",
        "iso8859-13" : "latin7",
        "iso8859-15" : "latin9",
        "iso8859-16" : "latin10",
        "applemac" : "applemac",
        "cp437" : "cp437",
        "cp437de" : "cp437de",
        "cp850" : "cp850",
        "cp852" : "cp852",
        "cp855" : "cp855",
        "cp858" : "cp858",
        "cp862" : "cp862",
        "cp865" : "cp865",
        "cp866" : "cp866",
        "cp1250" : "cp1250",
        "cp1251" : "cp1251",
        "cp1252" : "cp1252",
        "cp1255" : "cp1255",
        "cp1256" : "cp1256",
        "cp1257" : "cp1257",
        "koi8-r" : "koi8-r",
        "koi8-u" : "koi8-u",
        "pt154" : "pt154",
        "utf8-platex" : "utf8",
        "ascii" : "ascii"
    }

    i = 0
    bibresources = []
    while (True):
        i = find_token(document.body, "\\begin_inset CommandInset bibtex", i+1)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Can't find end of bibtex inset at line %d!!" %(i))
            continue
        encodings = get_quoted_value(document.body, "file_encodings", i, j)
        if not encodings:
            i = j
            continue
        bibfiles = get_quoted_value(document.body, "bibfiles", i, j).split(",")
        opts = get_quoted_value(document.body, "biblatexopts", i, j)
        if len(bibfiles) == 0:
            document.warning("Bibtex inset at line %d does not have a bibfile!" %(i))
        # remove encoding line
        k = find_token(document.body, "file_encodings", i, j)
        if k != -1:
            del document.body[k]
        # Re-find inset end line
        j = find_end_of_inset(document.body, i)
        if biblatex:
            enclist = encodings.split("\t")
            encmap = dict()
            for pp in enclist:
                ppp = pp.split(" ", 1)
                encmap[ppp[0]] = ppp[1]
            for bib in bibfiles:
                pr = "\\addbibresource"
                if bib in encmap.keys():
                    pr += "[bibencoding=" + encmap[bib] + "]"
                pr += "{" + bib + "}"
                add_to_preamble(document, [pr])
            # Insert ERT \\printbibliography and wrap bibtex inset to a Note
            pcmd = "printbibliography"
            if opts:
                pcmd += "[" + opts + "]"
            repl = ["\\begin_inset ERT", "status open", "", "\\begin_layout Plain Layout",\
                    "", "", "\\backslash", pcmd, "\\end_layout", "", "\\end_inset", "", "",\
                    "\\end_layout", "", "\\begin_layout Standard", "\\begin_inset Note Note",\
                    "status open", "", "\\begin_layout Plain Layout" ]
            repl += document.body[i:j+1]
            repl += ["", "\\end_layout", "", "\\end_inset", "", ""]
            document.body[i:j+1] = repl
            j += 27

        i = j


def revert_cmidruletrimming(document):
    """Remove \\cmidrule trimming"""

    # FIXME: Revert to TeX code?
    i = 0
    while True:
        # first, let's find out if we need to do anything
        i = find_token(document.body, '<cell ', i+1)
        if i == -1:
            return
        j = document.body[i].find('trim="')
        if j == -1:
             continue
        rgx = re.compile(r' (bottom|top)line[lr]trim="true"')
        # remove trim option
        document.body[i] = rgx.sub('', document.body[i])


ruby_inset_def = [
    r'### Inserted by lyx2lyx (ruby inset) ###',
    r'InsetLayout Flex:Ruby',
    r'  LyxType       charstyle',
    r'  LatexType     command',
    r'  LatexName     ruby',
    r'  HTMLTag       ruby',
    r'  HTMLAttr      ""',
    r'  HTMLInnerTag  rb',
    r'  HTMLInnerAttr ""',
    r'  BgColor       none',
    r'  LabelString   "Ruby"',
    r'  Decoration    Conglomerate',
    r'  Preamble',
    r'    \ifdefined\kanjiskip',
    r'      \IfFileExists{okumacro.sty}{\usepackage{okumacro}}{}',
    r'    \else \ifdefined\luatexversion',
    r'      \usepackage{luatexja-ruby}',
    r'    \else \ifdefined\XeTeXversion',
    r'      \usepackage{ruby}%',
    r'    \fi\fi\fi',
    r'    \providecommand{\ruby}[2]{\shortstack{\tiny #2\\#1}}',
    r'  EndPreamble',
    r'  Argument  post:1',
    r'    LabelString  "ruby text"',
    r'    MenuString  "Ruby Text|R"',
    r'    Tooltip    "Reading aid (ruby, furigana) for Chinese characters."',
    r'    Decoration  Conglomerate',
    r'    Font',
    r'      Size    tiny',
    r'    EndFont',
    r'    LabelFont',
    r'      Size    tiny',
    r'    EndFont',
    r'    Mandatory  1',
    r'  EndArgument',
    r'End',
]


def convert_ruby_module(document):
    """Use ruby module instead of local module definition"""
    if document.del_local_layout(ruby_inset_def):
        document.add_module("ruby")


def revert_ruby_module(document):
    """Replace ruby module with local module definition"""
    if document.del_module("ruby"):
        document.append_local_layout(ruby_inset_def)


def convert_utf8_japanese(document):
    """Use generic utf8 with Japanese documents."""
    lang = get_value(document.header, "\\language")
    if not lang.startswith("japanese"):
        return
    inputenc = get_value(document.header, "\\inputencoding")
    if ((lang == "japanese" and inputenc == "utf8-platex")
        or (lang == "japanese-cjk" and inputenc == "utf8-cjk")):
        document.set_parameter("inputencoding", "utf8")


def revert_utf8_japanese(document):
    """Use Japanese utf8 variants with Japanese documents."""
    inputenc = get_value(document.header, "\\inputencoding")
    if inputenc != "utf8":
        return
    lang = get_value(document.header, "\\language")
    if lang == "japanese":
        document.set_parameter("inputencoding", "utf8-platex")
    if lang == "japanese-cjk":
        document.set_parameter("inputencoding", "utf8-cjk")


def revert_lineno(document):
    " Replace lineno setting with user-preamble code."

    options = get_quoted_value(document.header, "\\lineno_options",
                               delete=True)
    if not get_bool_value(document.header, "\\use_lineno", delete=True):
        return
    if options:
        options = "[" + options + "]"
    add_to_preamble(document, ["\\usepackage%s{lineno}" % options,
                               "\\linenumbers"])

def convert_lineno(document):
    " Replace user-preamble code with native lineno support."
    use_lineno = 0
    options = ""
    i = find_token(document.preamble, "\\linenumbers", 1)
    if i > -1:
        usepkg = re.match(r"\\usepackage(.*){lineno}", document.preamble[i-1])
        if usepkg:
            use_lineno = 1
            options = usepkg.group(1).strip("[]")
            del(document.preamble[i-1:i+1])
            del_token(document.preamble, "% Added by lyx2lyx", i-2, i-1)

    k = find_token(document.header, "\\index ")
    if options == "":
        document.header[k:k] = ["\\use_lineno %d" % use_lineno]
    else:
        document.header[k:k] = ["\\use_lineno %d" % use_lineno,
                                "\\lineno_options %s" % options]


def convert_aaencoding(document):
    " Convert default document option due to encoding change in aa class. "

    if document.textclass != "aa":
        return

    i = find_token(document.header, "\\use_default_options true")
    if i == -1:
        return
    val = get_value(document.header, "\\inputencoding")
    if not val:
        document.warning("Malformed LyX Document! Missing '\\inputencoding' header.")
        return
    if val == "auto-legacy" or val == "latin9":
        document.header[i] = "\\use_default_options false"
        k = find_token(document.header, "\\options")
        if k == -1:
            document.header.insert(i, "\\options latin9")
        else:
            document.header[k] += ",latin9"


def revert_aaencoding(document):
    " Revert default document option due to encoding change in aa class. "

    if document.textclass != "aa":
        return

    i = find_token(document.header, "\\use_default_options true")
    if i == -1:
        return
    val = get_value(document.header, "\\inputencoding")
    if not val:
        document.warning("Malformed LyX Document! Missing \\inputencoding header.")
        return
    if val == "utf8":
        document.header[i] = "\\use_default_options false"
        k = find_token(document.header, "\\options", 0)
        if k == -1:
            document.header.insert(i, "\\options utf8")
        else:
            document.header[k] = document.header[k] + ",utf8"


def revert_new_languages(document):
    """Emulate support for Azerbaijani, Bengali, Church Slavonic, Korean,
    and Russian (Petrine orthography)."""

    #                lyxname:          (babelname, polyglossianame)
    new_languages = {"azerbaijani":    ("azerbaijani", ""),
                     "bengali":        ("", "bengali"),
                     "churchslavonic": ("", "churchslavonic"),
                     "oldrussian":     ("", "russian"),
                     "korean":         ("", "korean"),
                    }
    if document.language in new_languages:
        used_languages = {document.language}
    else:
        used_languages = set()
    i = 0
    while True:
        i = find_token(document.body, "\\lang", i+1)
        if i == -1:
            break
        val = get_value(document.body, "\\lang", i)
        if val in new_languages:
            used_languages.add(val)

    # Korean is already supported via CJK, so leave as-is for Babel
    if ("korean" in used_languages
        and (not get_bool_value(document.header, "\\use_non_tex_fonts")
             or get_value(document.header, "\\language_package") == "babel")):
        used_languages.discard("korean")

    for lang in used_languages:
        revert_language(document, lang, *new_languages[lang])


gloss_inset_def = [
    r'### Inserted by lyx2lyx (deprecated ling glosses) ###',
    r'InsetLayout Flex:Glosse',
    r'  LyXType               custom',
    r'  LabelString           "Gloss (old version)"',
    r'  MenuString            "Gloss (old version)"',
    r'  LatexType             environment',
    r'  LatexName             linggloss',
    r'  Decoration            minimalistic',
    r'  LabelFont',
    r'    Size                Small',
    r'  EndFont',
    r'  MultiPar              true',
    r'  CustomPars            false',
    r'  ForcePlain            true',
    r'  ParbreakIsNewline     true',
    r'  FreeSpacing           true',
    r'  Requires              covington',
    r'  Preamble',
    r'          \def\glosstr{}',
    r'          \@ifundefined{linggloss}{%',
    r'          \newenvironment{linggloss}[2][]{',
    r'             \def\glosstr{\glt #1}%',
    r'             \gll #2}',
    r'          {\glosstr\glend}}{}',
    r'  EndPreamble',
    r'  InToc                 true',
    r'  ResetsFont            true',
    r'  Argument 1',
    r'          Decoration    conglomerate',
    r'          LabelString   "Translation"',
    r'          MenuString    "Glosse Translation|s"',
    r'          Tooltip       "Add a translation for the glosse"',
    r'  EndArgument',
    r'End'
]

glosss_inset_def = [
    r'### Inserted by lyx2lyx (deprecated ling glosses) ###',
    r'InsetLayout Flex:Tri-Glosse',
    r'  LyXType               custom',
    r'  LabelString           "Tri-Gloss (old version)"',
    r'  MenuString            "Tri-Gloss (old version)"',
    r'  LatexType             environment',
    r'  LatexName             lingglosss',
    r'  Decoration            minimalistic',
    r'  LabelFont',
    r'    Size                Small',
    r'  EndFont',
    r'  MultiPar              true',
    r'  CustomPars            false',
    r'  ForcePlain            true',
    r'  ParbreakIsNewline     true',
    r'  FreeSpacing           true',
    r'  InToc                 true',
    r'  Requires              covington',
    r'  Preamble',
    r'          \def\glosstr{}',
    r'          \@ifundefined{lingglosss}{%',
    r'          \newenvironment{lingglosss}[2][]{',
    r'              \def\glosstr{\glt #1}%',
    r'              \glll #2}',
    r'          {\glosstr\glend}}{}',
    r'  EndPreamble',
    r'  ResetsFont            true',
    r'  Argument 1',
    r'          Decoration    conglomerate',
    r'          LabelString   "Translation"',
    r'          MenuString    "Glosse Translation|s"',
    r'          Tooltip       "Add a translation for the glosse"',
    r'  EndArgument',
    r'End'
]

def convert_linggloss(document):
    " Move old ling glosses to local layout "
    if find_token(document.body, '\\begin_inset Flex Glosse', 0) != -1:
        document.append_local_layout(gloss_inset_def)
    if find_token(document.body, '\\begin_inset Flex Tri-Glosse', 0) != -1:
        document.append_local_layout(glosss_inset_def)

def revert_linggloss(document):
    " Revert to old ling gloss definitions "
    if not "linguistics" in document.get_module_list():
        return
    document.del_local_layout(gloss_inset_def)
    document.del_local_layout(glosss_inset_def)

    cov_req = False
    glosses = ["\\begin_inset Flex Interlinear Gloss (2 Lines)", "\\begin_inset Flex Interlinear Gloss (3 Lines)"]
    for glosse in glosses:
        i = 0
        while True:
            i = find_token(document.body, glosse, i+1)
            if i == -1:
                break
            j = find_end_of_inset(document.body, i)
            if j == -1:
                document.warning("Malformed LyX document: Can't find end of Gloss inset")
                continue

            arg = find_token(document.body, "\\begin_inset Argument 1", i, j)
            endarg = find_end_of_inset(document.body, arg)
            optargcontent = []
            if arg != -1:
                argbeginPlain = find_token(document.body, "\\begin_layout Plain Layout", arg, endarg)
                if argbeginPlain == -1:
                    document.warning("Malformed LyX document: Can't find optarg plain Layout")
                    continue
                argendPlain = find_end_of_inset(document.body, argbeginPlain)
                optargcontent = document.body[argbeginPlain + 1 : argendPlain - 2]

                # remove Arg insets and paragraph, if it only contains this inset
                if document.body[arg - 1] == "\\begin_layout Plain Layout" and find_end_of_layout(document.body, arg - 1) == endarg + 3:
                    del document.body[arg - 1 : endarg + 4]
                else:
                    del document.body[arg : endarg + 1]

            arg = find_token(document.body, "\\begin_inset Argument post:1", i, j)
            endarg = find_end_of_inset(document.body, arg)
            marg1content = []
            if arg != -1:
                argbeginPlain = find_token(document.body, "\\begin_layout Plain Layout", arg, endarg)
                if argbeginPlain == -1:
                    document.warning("Malformed LyX document: Can't find arg 1 plain Layout")
                    continue
                argendPlain = find_end_of_inset(document.body, argbeginPlain)
                marg1content = document.body[argbeginPlain + 1 : argendPlain - 2]

                # remove Arg insets and paragraph, if it only contains this inset
                if document.body[arg - 1] == "\\begin_layout Plain Layout" and find_end_of_layout(document.body, arg - 1) == endarg + 3:
                    del document.body[arg - 1 : endarg + 4]
                else:
                    del document.body[arg : endarg + 1]

            arg = find_token(document.body, "\\begin_inset Argument post:2", i, j)
            endarg = find_end_of_inset(document.body, arg)
            marg2content = []
            if arg != -1:
                argbeginPlain = find_token(document.body, "\\begin_layout Plain Layout", arg, endarg)
                if argbeginPlain == -1:
                    document.warning("Malformed LyX document: Can't find arg 2 plain Layout")
                    continue
                argendPlain = find_end_of_inset(document.body, argbeginPlain)
                marg2content = document.body[argbeginPlain + 1 : argendPlain - 2]

                # remove Arg insets and paragraph, if it only contains this inset
                if document.body[arg - 1] == "\\begin_layout Plain Layout" and find_end_of_layout(document.body, arg - 1) == endarg + 3:
                    del document.body[arg - 1 : endarg + 4]
                else:
                    del document.body[arg : endarg + 1]

            arg = find_token(document.body, "\\begin_inset Argument post:3", i, j)
            endarg = find_end_of_inset(document.body, arg)
            marg3content = []
            if arg != -1:
                argbeginPlain = find_token(document.body, "\\begin_layout Plain Layout", arg, endarg)
                if argbeginPlain == -1:
                    document.warning("Malformed LyX document: Can't find arg 3 plain Layout")
                    continue
                argendPlain = find_end_of_inset(document.body, argbeginPlain)
                marg3content = document.body[argbeginPlain + 1 : argendPlain - 2]

                # remove Arg insets and paragraph, if it only contains this inset
                if document.body[arg - 1] == "\\begin_layout Plain Layout" and find_end_of_layout(document.body, arg - 1) == endarg + 3:
                    del document.body[arg - 1 : endarg + 4]
                else:
                    del document.body[arg : endarg + 1]

            cmd = "\\digloss"
            if glosse == "\\begin_inset Flex Interlinear Gloss (3 Lines)":
                cmd = "\\trigloss"

            beginPlain = find_token(document.body, "\\begin_layout Plain Layout", i)
            endInset = find_end_of_inset(document.body, i)
            endPlain = find_end_of_layout(document.body, beginPlain)
            precontent = put_cmd_in_ert(cmd)
            if len(optargcontent) > 0:
                precontent += put_cmd_in_ert("[") + optargcontent + put_cmd_in_ert("]")
            precontent += put_cmd_in_ert("{")

            postcontent = put_cmd_in_ert("}{") + marg1content + put_cmd_in_ert("}{") + marg2content
            if cmd == "\\trigloss":
                postcontent += put_cmd_in_ert("}{") + marg3content
            postcontent += put_cmd_in_ert("}")

            document.body[endPlain:endInset + 1] = postcontent
            document.body[beginPlain + 1:beginPlain] = precontent
            del document.body[i : beginPlain + 1]
            if not cov_req:
                document.append_local_layout("Requires covington")
                cov_req = True
            i = beginPlain


def revert_subexarg(document):
    " Revert linguistic subexamples with argument to ERT "

    if not "linguistics" in document.get_module_list():
        return

    cov_req = False
    i = 0
    while True:
        i = find_token(document.body, "\\begin_layout Subexample", i+1)
        if i == -1:
            break
        j = find_end_of_layout(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Can't find end of Subexample layout")
            continue
        while True:
            # check for consecutive layouts
            k = find_token(document.body, "\\begin_layout", j)
            if k == -1 or document.body[k] != "\\begin_layout Subexample":
                break
            j = find_end_of_layout(document.body, k)
            if j == -1:
                 document.warning("Malformed LyX document: Can't find end of Subexample layout")
                 continue

        arg = find_token(document.body, "\\begin_inset Argument 1", i, j)
        if arg == -1:
            continue

        endarg = find_end_of_inset(document.body, arg)
        optargcontent = ""
        argbeginPlain = find_token(document.body, "\\begin_layout Plain Layout", arg, endarg)
        if argbeginPlain == -1:
            document.warning("Malformed LyX document: Can't find optarg plain Layout")
            continue
        argendPlain = find_end_of_inset(document.body, argbeginPlain)
        optargcontent = lyx2latex(document, document.body[argbeginPlain + 1 : argendPlain - 2])

        # remove Arg insets and paragraph, if it only contains this inset
        if document.body[arg - 1] == "\\begin_layout Plain Layout" and find_end_of_layout(document.body, arg - 1) == endarg + 3:
            del document.body[arg - 1 : endarg + 4]
        else:
            del document.body[arg : endarg + 1]

        cmd = put_cmd_in_ert("\\begin{subexamples}[" + optargcontent + "]")

        # re-find end of layout
        j = find_end_of_layout(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Can't find end of Subexample layout")
            continue
        while True:
            # check for consecutive layouts
            k = find_token(document.body, "\\begin_layout", j)
            if k == -1 or document.body[k] != "\\begin_layout Subexample":
                break
            document.body[k : k + 1] = ["\\begin_layout Standard"] + put_cmd_in_ert("\\item ")
            j = find_end_of_layout(document.body, k)
            if j == -1:
                 document.warning("Malformed LyX document: Can't find end of Subexample layout")
                 continue

        endev = put_cmd_in_ert("\\end{subexamples}")

        document.body[j : j] = ["\\end_layout", "", "\\begin_layout Standard"] + endev
        document.body[i : i + 1] = ["\\begin_layout Standard"] + cmd \
                + ["\\end_layout", "", "\\begin_layout Standard"] + put_cmd_in_ert("\\item ")
        if not cov_req:
            document.append_local_layout("Requires covington")
            cov_req = True


def revert_drs(document):
    " Revert DRS insets (linguistics) to ERT "

    if not "linguistics" in document.get_module_list():
        return

    cov_req = False
    drses = ["\\begin_inset Flex DRS", "\\begin_inset Flex DRS*",
             "\\begin_inset Flex IfThen-DRS", "\\begin_inset Flex Cond-DRS",
             "\\begin_inset Flex QDRS", "\\begin_inset Flex NegDRS",
             "\\begin_inset Flex SDRS"]
    for drs in drses:
        i = 0
        while True:
            i = find_token(document.body, drs, i+1)
            if i == -1:
                break
            j = find_end_of_inset(document.body, i)
            if j == -1:
                document.warning("Malformed LyX document: Can't find end of DRS inset")
                continue

            # Check for arguments
            arg = find_token(document.body, "\\begin_inset Argument 1", i, j)
            endarg = find_end_of_inset(document.body, arg)
            prearg1content = []
            if arg != -1:
                argbeginPlain = find_token(document.body, "\\begin_layout Plain Layout", arg, endarg)
                if argbeginPlain == -1:
                    document.warning("Malformed LyX document: Can't find Argument 1 plain Layout")
                    continue
                argendPlain = find_end_of_inset(document.body, argbeginPlain)
                prearg1content = document.body[argbeginPlain + 1 : argendPlain - 2]

                # remove Arg insets and paragraph, if it only contains this inset
                if document.body[arg - 1] == "\\begin_layout Plain Layout" and find_end_of_layout(document.body, arg - 1) == endarg + 3:
                    del document.body[arg - 1 : endarg + 4]
                else:
                    del document.body[arg : endarg + 1]

            # re-find inset end
            j = find_end_of_inset(document.body, i)
            if j == -1:
                document.warning("Malformed LyX document: Can't find end of DRS inset")
                continue

            arg = find_token(document.body, "\\begin_inset Argument 2", i, j)
            endarg = find_end_of_inset(document.body, arg)
            prearg2content = []
            if arg != -1:
                argbeginPlain = find_token(document.body, "\\begin_layout Plain Layout", arg, endarg)
                if argbeginPlain == -1:
                    document.warning("Malformed LyX document: Can't find Argument 2 plain Layout")
                    continue
                argendPlain = find_end_of_inset(document.body, argbeginPlain)
                prearg2content = document.body[argbeginPlain + 1 : argendPlain - 2]

                # remove Arg insets and paragraph, if it only contains this inset
                if document.body[arg - 1] == "\\begin_layout Plain Layout" and find_end_of_layout(document.body, arg - 1) == endarg + 3:
                    del document.body[arg - 1 : endarg + 4]
                else:
                    del document.body[arg : endarg + 1]

            # re-find inset end
            j = find_end_of_inset(document.body, i)
            if j == -1:
                document.warning("Malformed LyX document: Can't find end of DRS inset")
                continue

            arg = find_token(document.body, "\\begin_inset Argument post:1", i, j)
            endarg = find_end_of_inset(document.body, arg)
            postarg1content = []
            if arg != -1:
                argbeginPlain = find_token(document.body, "\\begin_layout Plain Layout", arg, endarg)
                if argbeginPlain == -1:
                    document.warning("Malformed LyX document: Can't find Argument post:1 plain Layout")
                    continue
                argendPlain = find_end_of_inset(document.body, argbeginPlain)
                postarg1content = document.body[argbeginPlain + 1 : argendPlain - 2]

                # remove Arg insets and paragraph, if it only contains this inset
                if document.body[arg - 1] == "\\begin_layout Plain Layout" and find_end_of_layout(document.body, arg - 1) == endarg + 3:
                    del document.body[arg - 1 : endarg + 4]
                else:
                    del document.body[arg : endarg + 1]

            # re-find inset end
            j = find_end_of_inset(document.body, i)
            if j == -1:
                document.warning("Malformed LyX document: Can't find end of DRS inset")
                continue

            arg = find_token(document.body, "\\begin_inset Argument post:2", i, j)
            endarg = find_end_of_inset(document.body, arg)
            postarg2content = []
            if arg != -1:
                argbeginPlain = find_token(document.body, "\\begin_layout Plain Layout", arg, endarg)
                if argbeginPlain == -1:
                    document.warning("Malformed LyX document: Can't find Argument post:2 plain Layout")
                    continue
                argendPlain = find_end_of_inset(document.body, argbeginPlain)
                postarg2content = document.body[argbeginPlain + 1 : argendPlain - 2]

                # remove Arg insets and paragraph, if it only contains this inset
                if document.body[arg - 1] == "\\begin_layout Plain Layout" and find_end_of_layout(document.body, arg - 1) == endarg + 3:
                    del document.body[arg - 1 : endarg + 4]
                else:
                    del document.body[arg : endarg + 1]

            # re-find inset end
            j = find_end_of_inset(document.body, i)
            if j == -1:
                document.warning("Malformed LyX document: Can't find end of DRS inset")
                continue

            arg = find_token(document.body, "\\begin_inset Argument post:3", i, j)
            endarg = find_end_of_inset(document.body, arg)
            postarg3content = []
            if arg != -1:
                argbeginPlain = find_token(document.body, "\\begin_layout Plain Layout", arg, endarg)
                if argbeginPlain == -1:
                    document.warning("Malformed LyX document: Can't find Argument post:3 plain Layout")
                    continue
                argendPlain = find_end_of_inset(document.body, argbeginPlain)
                postarg3content = document.body[argbeginPlain + 1 : argendPlain - 2]

                # remove Arg insets and paragraph, if it only contains this inset
                if document.body[arg - 1] == "\\begin_layout Plain Layout" and find_end_of_layout(document.body, arg - 1) == endarg + 3:
                    del document.body[arg - 1 : endarg + 4]
                else:
                    del document.body[arg : endarg + 1]

            # re-find inset end
            j = find_end_of_inset(document.body, i)
            if j == -1:
                document.warning("Malformed LyX document: Can't find end of DRS inset")
                continue

            arg = find_token(document.body, "\\begin_inset Argument post:4", i, j)
            endarg = find_end_of_inset(document.body, arg)
            postarg4content = []
            if arg != -1:
                argbeginPlain = find_token(document.body, "\\begin_layout Plain Layout", arg, endarg)
                if argbeginPlain == -1:
                    document.warning("Malformed LyX document: Can't find Argument post:4 plain Layout")
                    continue
                argendPlain = find_end_of_inset(document.body, argbeginPlain)
                postarg4content = document.body[argbeginPlain + 1 : argendPlain - 2]

                # remove Arg insets and paragraph, if it only contains this inset
                if document.body[arg - 1] == "\\begin_layout Plain Layout" and find_end_of_layout(document.body, arg - 1) == endarg + 3:
                    del document.body[arg - 1 : endarg + 4]
                else:
                    del document.body[arg : endarg + 1]

            # The respective LaTeX command
            cmd = "\\drs"
            if drs == "\\begin_inset Flex DRS*":
                cmd = "\\drs*"
            elif drs == "\\begin_inset Flex IfThen-DRS":
                cmd = "\\ifdrs"
            elif drs == "\\begin_inset Flex Cond-DRS":
                cmd = "\\condrs"
            elif drs == "\\begin_inset Flex QDRS":
                cmd = "\\qdrs"
            elif drs == "\\begin_inset Flex NegDRS":
                cmd = "\\negdrs"
            elif drs == "\\begin_inset Flex SDRS":
                cmd = "\\sdrs"

            beginPlain = find_token(document.body, "\\begin_layout Plain Layout", i)
            endInset = find_end_of_inset(document.body, i)
            endPlain = find_token_backwards(document.body, "\\end_layout", endInset)
            precontent = put_cmd_in_ert(cmd)
            precontent += put_cmd_in_ert("{") + prearg1content + put_cmd_in_ert("}")
            if drs == "\\begin_inset Flex SDRS":
                precontent += put_cmd_in_ert("{") + prearg2content + put_cmd_in_ert("}")
            precontent += put_cmd_in_ert("{")

            postcontent = []
            if cmd == "\\qdrs" or cmd == "\\condrs" or cmd == "\\ifdrs":
                postcontent = put_cmd_in_ert("}{") + postarg1content + put_cmd_in_ert("}{") + postarg2content + put_cmd_in_ert("}")
                if cmd == "\\condrs" or cmd == "\\qdrs":
                    postcontent += put_cmd_in_ert("{") + postarg3content + put_cmd_in_ert("}")
                if cmd == "\\qdrs":
                    postcontent += put_cmd_in_ert("{") + postarg4content + put_cmd_in_ert("}")
            else:
                postcontent = put_cmd_in_ert("}")

            document.body[endPlain:endInset + 1] = postcontent
            document.body[beginPlain + 1:beginPlain] = precontent
            del document.body[i : beginPlain + 1]
            if not cov_req:
                document.append_local_layout("Provides covington 1")
                add_to_preamble(document, ["\\usepackage{drs,covington}"])
                cov_req = True
            i = beginPlain



def revert_babelfont(document):
    " Reverts the use of \\babelfont to user preamble "

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        return

    i = find_token(document.header, '\\language_package', 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\language_package.")
        return
    if get_value(document.header, "\\language_package", 0) != "babel":
        return

    # check font settings
    # defaults
    roman = sans = typew = "default"
    osf = False
    sf_scale = tt_scale = 100.0

    j = find_token(document.header, "\\font_roman", 0)
    if j == -1:
        document.warning("Malformed LyX document: Missing \\font_roman.")
    else:
        # We need to use this regex since split() does not handle quote protection
        romanfont = re.findall(r'[^"\s]\S*|".+?"', document.header[j])
        roman = romanfont[2].strip('"')
        romanfont[2] = '"default"'
        document.header[j] = " ".join(romanfont)

    j = find_token(document.header, "\\font_sans", 0)
    if j == -1:
        document.warning("Malformed LyX document: Missing \\font_sans.")
    else:
        # We need to use this regex since split() does not handle quote protection
        sansfont = re.findall(r'[^"\s]\S*|".+?"', document.header[j])
        sans = sansfont[2].strip('"')
        sansfont[2] = '"default"'
        document.header[j] = " ".join(sansfont)

    j = find_token(document.header, "\\font_typewriter", 0)
    if j == -1:
        document.warning("Malformed LyX document: Missing \\font_typewriter.")
    else:
        # We need to use this regex since split() does not handle quote protection
        ttfont = re.findall(r'[^"\s]\S*|".+?"', document.header[j])
        typew = ttfont[2].strip('"')
        ttfont[2] = '"default"'
        document.header[j] = " ".join(ttfont)

    i = find_token(document.header, "\\font_osf", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_osf.")
    else:
        osf = str2bool(get_value(document.header, "\\font_osf", i))

    j = find_token(document.header, "\\font_sf_scale", 0)
    if j == -1:
        document.warning("Malformed LyX document: Missing \\font_sf_scale.")
    else:
        sfscale = document.header[j].split()
        val = sfscale[2]
        sfscale[2] = "100"
        document.header[j] = " ".join(sfscale)
        try:
            # float() can throw
            sf_scale = float(val)
        except:
            document.warning("Invalid font_sf_scale value: " + val)

    j = find_token(document.header, "\\font_tt_scale", 0)
    if j == -1:
        document.warning("Malformed LyX document: Missing \\font_tt_scale.")
    else:
        ttscale = document.header[j].split()
        val = ttscale[2]
        ttscale[2] = "100"
        document.header[j] = " ".join(ttscale)
        try:
            # float() can throw
            tt_scale = float(val)
        except:
            document.warning("Invalid font_tt_scale value: " + val)

    # set preamble stuff
    pretext = ['%% This document must be processed with xelatex or lualatex!']
    pretext.append('\\AtBeginDocument{%')
    if roman != "default":
        pretext.append('\\babelfont{rm}[Mapping=tex-text]{' + roman + '}')
    if sans != "default":
        sf = '\\babelfont{sf}['
        if sf_scale != 100.0:
            sf += 'Scale=' + str(sf_scale / 100.0) + ','
        sf += 'Mapping=tex-text]{' + sans + '}'
        pretext.append(sf)
    if typew != "default":
        tw = '\\babelfont{tt}'
        if tt_scale != 100.0:
            tw += '[Scale=' + str(tt_scale / 100.0) + ']'
        tw += '{' + typew + '}'
        pretext.append(tw)
    if osf:
        pretext.append('\\defaultfontfeatures{Numbers=OldStyle}')
    pretext.append('}')
    insert_to_preamble(document, pretext)


def revert_minionpro(document):
    " Revert native MinionPro font definition (with extra options) to LaTeX "

    if get_bool_value(document.header, "\\use_non_tex_fonts"):
        return

    regexp = re.compile(r'(\\font_roman_opts)')
    x = find_re(document.header, regexp, 0)
    if x == -1:
        return

    # We need to use this regex since split() does not handle quote protection
    romanopts = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
    opts = romanopts[1].strip('"')

    i = find_token(document.header, "\\font_roman", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_roman.")
        return
    else:
        # We need to use this regex since split() does not handle quote protection
        romanfont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
        roman = romanfont[1].strip('"')
        if roman != "minionpro":
            return
        romanfont[1] = '"default"'
        document.header[i] = " ".join(romanfont)
        osf = False
        j = find_token(document.header, "\\font_osf true", 0)
        if j != -1:
            osf = True
        preamble = "\\usepackage["
        if osf:
            document.header[j] = "\\font_osf false"
        else:
            preamble += "lf,"
        preamble += opts
        preamble += "]{MinionPro}"
        add_to_preamble(document, [preamble])
        del document.header[x]


def revert_font_opts(document):
    " revert font options by outputting \\setxxxfont or \\babelfont to the preamble "

    NonTeXFonts = get_bool_value(document.header, "\\use_non_tex_fonts")
    Babel = (get_value(document.header, "\\language_package") == "babel")

    # 1. Roman
    regexp = re.compile(r'(\\font_roman_opts)')
    i = find_re(document.header, regexp, 0)
    if i != -1:
        # We need to use this regex since split() does not handle quote protection
        romanopts = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
        opts = romanopts[1].strip('"')
        del document.header[i]
        if NonTeXFonts:
            regexp = re.compile(r'(\\font_roman)')
            i = find_re(document.header, regexp, 0)
            if i != -1:
                # We need to use this regex since split() does not handle quote protection
                romanfont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
                font = romanfont[2].strip('"')
                romanfont[2] = '"default"'
                document.header[i] = " ".join(romanfont)
                if font != "default":
                    if Babel:
                        preamble = "\\babelfont{rm}["
                    else:
                        preamble = "\\setmainfont["
                    preamble += opts
                    preamble += ","
                    preamble += "Mapping=tex-text]{"
                    preamble += font
                    preamble += "}"
                    add_to_preamble(document, [preamble])

    # 2. Sans
    regexp = re.compile(r'(\\font_sans_opts)')
    i = find_re(document.header, regexp, 0)
    if i != -1:
        scaleval = 100
        # We need to use this regex since split() does not handle quote protection
        sfopts = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
        opts = sfopts[1].strip('"')
        del document.header[i]
        if NonTeXFonts:
            regexp = re.compile(r'(\\font_sf_scale)')
            i = find_re(document.header, regexp, 0)
            if i != -1:
                scaleval = get_value(document.header, "\\font_sf_scale" , i).split()[1]
            regexp = re.compile(r'(\\font_sans)')
            i = find_re(document.header, regexp, 0)
            if i != -1:
                # We need to use this regex since split() does not handle quote protection
                sffont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
                font = sffont[2].strip('"')
                sffont[2] = '"default"'
                document.header[i] = " ".join(sffont)
                if font != "default":
                    if Babel:
                        preamble = "\\babelfont{sf}["
                    else:
                        preamble = "\\setsansfont["
                    preamble += opts
                    preamble += ","
                    if scaleval != 100:
                        preamble += "Scale=0."
                        preamble += scaleval
                        preamble += ","
                    preamble += "Mapping=tex-text]{"
                    preamble += font
                    preamble += "}"
                    add_to_preamble(document, [preamble])

    # 3. Typewriter
    regexp = re.compile(r'(\\font_typewriter_opts)')
    i = find_re(document.header, regexp, 0)
    if i != -1:
        scaleval = 100
        # We need to use this regex since split() does not handle quote protection
        ttopts = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
        opts = ttopts[1].strip('"')
        del document.header[i]
        if NonTeXFonts:
            regexp = re.compile(r'(\\font_tt_scale)')
            i = find_re(document.header, regexp, 0)
            if i != -1:
                scaleval = get_value(document.header, "\\font_tt_scale" , i).split()[1]
            regexp = re.compile(r'(\\font_typewriter)')
            i = find_re(document.header, regexp, 0)
            if i != -1:
                # We need to use this regex since split() does not handle quote protection
                ttfont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
                font = ttfont[2].strip('"')
                ttfont[2] = '"default"'
                document.header[i] = " ".join(ttfont)
                if font != "default":
                    if Babel:
                        preamble = "\\babelfont{tt}["
                    else:
                        preamble = "\\setmonofont["
                    preamble += opts
                    preamble += ","
                    if scaleval != 100:
                        preamble += "Scale=0."
                        preamble += scaleval
                        preamble += ","
                    preamble += "Mapping=tex-text]{"
                    preamble += font
                    preamble += "}"
                    add_to_preamble(document, [preamble])


def revert_plainNotoFonts_xopts(document):
    " Revert native (straight) Noto font definition (with extra options) to LaTeX "

    if get_bool_value(document.header, "\\use_non_tex_fonts"):
        return

    osf = False
    y = find_token(document.header, "\\font_osf true", 0)
    if y != -1:
        osf = True

    regexp = re.compile(r'(\\font_roman_opts)')
    x = find_re(document.header, regexp, 0)
    if x == -1 and not osf:
        return

    opts = ""
    if x != -1:
        # We need to use this regex since split() does not handle quote protection
        romanopts = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
        opts = romanopts[1].strip('"')
    if osf:
        if opts != "":
            opts += ", "
        opts += "osf"

    i = find_token(document.header, "\\font_roman", 0)
    if i == -1:
        return

    # We need to use this regex since split() does not handle quote protection
    romanfont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
    roman = romanfont[1].strip('"')
    if roman != "NotoSerif-TLF":
        return

    j = find_token(document.header, "\\font_sans", 0)
    if j == -1:
        return

    # We need to use this regex since split() does not handle quote protection
    sffont = re.findall(r'[^"\s]\S*|".+?"', document.header[j])
    sf = sffont[1].strip('"')
    if sf != "default":
        return

    j = find_token(document.header, "\\font_typewriter", 0)
    if j == -1:
        return

    # We need to use this regex since split() does not handle quote protection
    ttfont = re.findall(r'[^"\s]\S*|".+?"', document.header[j])
    tt = ttfont[1].strip('"')
    if tt != "default":
        return

    # So we have noto as "complete font"
    romanfont[1] = '"default"'
    document.header[i] = " ".join(romanfont)

    preamble = "\\usepackage["
    preamble += opts
    preamble += "]{noto}"
    add_to_preamble(document, [preamble])
    if osf:
        document.header[y] = "\\font_osf false"
    if x != -1:
        del document.header[x]


def revert_notoFonts_xopts(document):
    " Revert native (extended) Noto font definition (with extra options) to LaTeX "

    if get_bool_value(document.header, "\\use_non_tex_fonts"):
        return

    fontmap = dict()
    fm = createFontMapping(['Noto'])
    if revert_fonts(document, fm, fontmap, True):
        add_preamble_fonts(document, fontmap)


def revert_IBMFonts_xopts(document):
    " Revert native IBM font definition (with extra options) to LaTeX "

    if get_bool_value(document.header, "\\use_non_tex_fonts"):
        return

    fontmap = dict()
    fm = createFontMapping(['IBM'])
    ft = ""
    if revert_fonts(document, fm, fontmap, True):
        add_preamble_fonts(document, fontmap)


def revert_AdobeFonts_xopts(document):
    " Revert native Adobe font definition (with extra options) to LaTeX "

    if get_bool_value(document.header, "\\use_non_tex_fonts"):
        return

    fontmap = dict()
    fm = createFontMapping(['Adobe'])
    ft = ""
    if revert_fonts(document, fm, fontmap, True):
        add_preamble_fonts(document, fontmap)


def convert_osf(document):
    " Convert \\font_osf param to new format "

    NonTeXFonts = get_bool_value(document.header, "\\use_non_tex_fonts")

    i = find_token(document.header, '\\font_osf', 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_osf.")
        return

    osfsf = ["biolinum", "ADOBESourceSansPro", "NotoSansRegular", "NotoSansMedium", "NotoSansThin", "NotoSansLight", "NotoSansExtralight" ]
    osftt = ["ADOBESourceCodePro", "NotoMonoRegular" ]

    osfval = str2bool(get_value(document.header, "\\font_osf", i))
    document.header[i] = document.header[i].replace("\\font_osf", "\\font_roman_osf")

    if NonTeXFonts:
        document.header.insert(i, "\\font_sans_osf false")
        document.header.insert(i + 1, "\\font_typewriter_osf false")
        return

    if osfval:
        x = find_token(document.header, "\\font_sans", 0)
        if x == -1:
            document.warning("Malformed LyX document: Missing \\font_sans.")
        else:
            # We need to use this regex since split() does not handle quote protection
            sffont = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
            sf = sffont[1].strip('"')
            if sf in osfsf:
                document.header.insert(i, "\\font_sans_osf true")
            else:
                document.header.insert(i, "\\font_sans_osf false")

        x = find_token(document.header, "\\font_typewriter", 0)
        if x == -1:
            document.warning("Malformed LyX document: Missing \\font_typewriter.")
        else:
            # We need to use this regex since split() does not handle quote protection
            ttfont = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
            tt = ttfont[1].strip('"')
            if tt in osftt:
                document.header.insert(i + 1, "\\font_typewriter_osf true")
            else:
                document.header.insert(i + 1, "\\font_typewriter_osf false")

    else:
        document.header.insert(i, "\\font_sans_osf false")
        document.header.insert(i + 1, "\\font_typewriter_osf false")


def revert_osf(document):
    " Revert \\font_*_osf params "

    NonTeXFonts = get_bool_value(document.header, "\\use_non_tex_fonts")

    i = find_token(document.header, '\\font_roman_osf', 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_roman_osf.")
        return

    osfval = str2bool(get_value(document.header, "\\font_roman_osf", i))
    document.header[i] = document.header[i].replace("\\font_roman_osf", "\\font_osf")

    i = find_token(document.header, '\\font_sans_osf', 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_sans_osf.")
        return

    osfval = str2bool(get_value(document.header, "\\font_sans_osf", i))
    del document.header[i]

    i = find_token(document.header, '\\font_typewriter_osf', 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_typewriter_osf.")
        return

    osfval |= str2bool(get_value(document.header, "\\font_typewriter_osf", i))
    del document.header[i]

    if osfval:
        i = find_token(document.header, '\\font_osf', 0)
        if i == -1:
            document.warning("Malformed LyX document: Missing \\font_osf.")
            return
        document.header[i] = "\\font_osf true"


def revert_texfontopts(document):
    " Revert native TeX font definitions (with extra options) to LaTeX "

    if get_bool_value(document.header, "\\use_non_tex_fonts"):
        return

    rmfonts = ["ccfonts", "cochineal", "utopia", "garamondx", "libertine", "lmodern", "palatino", "times", "xcharter" ]

    # First the sf (biolinum only)
    regexp = re.compile(r'(\\font_sans_opts)')
    x = find_re(document.header, regexp, 0)
    if x != -1:
        # We need to use this regex since split() does not handle quote protection
        sfopts = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
        opts = sfopts[1].strip('"')
        i = find_token(document.header, "\\font_sans", 0)
        if i == -1:
            document.warning("Malformed LyX document: Missing \\font_sans.")
        else:
            # We need to use this regex since split() does not handle quote protection
            sffont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
            sans = sffont[1].strip('"')
            if sans == "biolinum":
                sf_scale = 100.0
                sffont[1] = '"default"'
                document.header[i] = " ".join(sffont)
                osf = False
                j = find_token(document.header, "\\font_sans_osf true", 0)
                if j != -1:
                    osf = True
                k = find_token(document.header, "\\font_sf_scale", 0)
                if k == -1:
                    document.warning("Malformed LyX document: Missing \\font_sf_scale.")
                else:
                    sfscale = document.header[k].split()
                    val = sfscale[1]
                    sfscale[1] = "100"
                    document.header[k] = " ".join(sfscale)
                    try:
                        # float() can throw
                        sf_scale = float(val)
                    except:
                        document.warning("Invalid font_sf_scale value: " + val)
                preamble = "\\usepackage["
                if osf:
                    document.header[j] = "\\font_sans_osf false"
                    preamble += "osf,"
                if sf_scale != 100.0:
                    preamble += 'scaled=' + str(sf_scale / 100.0) + ','
                preamble += opts
                preamble += "]{biolinum}"
                add_to_preamble(document, [preamble])
                del document.header[x]

    regexp = re.compile(r'(\\font_roman_opts)')
    x = find_re(document.header, regexp, 0)
    if x == -1:
        return

    # We need to use this regex since split() does not handle quote protection
    romanopts = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
    opts = romanopts[1].strip('"')

    i = find_token(document.header, "\\font_roman", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_roman.")
        return
    else:
        # We need to use this regex since split() does not handle quote protection
        romanfont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
        roman = romanfont[1].strip('"')
        if not roman in rmfonts:
            return
        romanfont[1] = '"default"'
        document.header[i] = " ".join(romanfont)
        package = roman
        if roman == "utopia":
            package = "fourier"
        elif roman == "palatino":
            package = "mathpazo"
        elif roman == "times":
            package = "mathptmx"
        elif roman == "xcharter":
            package = "XCharter"
        osf = ""
        j = find_token(document.header, "\\font_roman_osf true", 0)
        if j != -1:
            if roman == "cochineal":
                osf = "proportional,osf,"
            elif roman == "utopia":
                osf = "oldstyle,"
            elif roman == "garamondx":
                osf = "osfI,"
            elif roman == "libertine":
                osf = "osf,"
            elif roman == "palatino":
                osf = "osf,"
            elif roman == "xcharter":
                osf = "osf,"
            document.header[j] = "\\font_roman_osf false"
        k = find_token(document.header, "\\font_sc true", 0)
        if k != -1:
            if roman == "utopia":
                osf += "expert,"
            if roman == "palatino" and osf == "":
                osf = "sc,"
            document.header[k] = "\\font_sc false"
        preamble = "\\usepackage["
        preamble += osf
        preamble += opts
        preamble += "]{" + package + "}"
        add_to_preamble(document, [preamble])
        del document.header[x]


def convert_CantarellFont(document):
    " Handle Cantarell font definition to LaTeX "

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fm = createFontMapping(['Cantarell'])
        convert_fonts(document, fm, "oldstyle")

def revert_CantarellFont(document):
    " Revert native Cantarell font definition to LaTeX "

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fontmap = dict()
        fm = createFontMapping(['Cantarell'])
        if revert_fonts(document, fm, fontmap, False, True):
            add_preamble_fonts(document, fontmap)

def convert_ChivoFont(document):
    " Handle Chivo font definition to LaTeX "

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fm = createFontMapping(['Chivo'])
        convert_fonts(document, fm, "oldstyle")

def revert_ChivoFont(document):
    " Revert native Chivo font definition to LaTeX "

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fontmap = dict()
        fm = createFontMapping(['Chivo'])
        if revert_fonts(document, fm, fontmap, False, True):
            add_preamble_fonts(document, fontmap)


def convert_FiraFont(document):
    " Handle Fira font definition to LaTeX "

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fm = createFontMapping(['Fira'])
        convert_fonts(document, fm, "lf")

def revert_FiraFont(document):
    " Revert native Fira font definition to LaTeX "

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fontmap = dict()
        fm = createFontMapping(['Fira'])
        if revert_fonts(document, fm, fontmap, False, True):
            add_preamble_fonts(document, fontmap)


def convert_Semibolds(document):
    " Move semibold options to extraopts "

    NonTeXFonts = get_bool_value(document.header, "\\use_non_tex_fonts")

    i = find_token(document.header, "\\font_roman", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_roman.")
    else:
        # We need to use this regex since split() does not handle quote protection
        romanfont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
        roman = romanfont[1].strip('"')
        if roman == "IBMPlexSerifSemibold":
            romanfont[1] = '"IBMPlexSerif"'
            document.header[i] = " ".join(romanfont)

            if NonTeXFonts == False:
                regexp = re.compile(r'(\\font_roman_opts)')
                x = find_re(document.header, regexp, 0)
                if x == -1:
                    # Sensible place to insert tag
                    fo = find_token(document.header, "\\font_sf_scale")
                    if fo == -1:
                        document.warning("Malformed LyX document! Missing \\font_sf_scale")
                    else:
                        document.header.insert(fo, "\\font_roman_opts \"semibold\"")
                else:
                    # We need to use this regex since split() does not handle quote protection
                    romanopts = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
                    document.header[x] = "\\font_roman_opts \"semibold, " + romanopts[1].strip('"') + "\""

    i = find_token(document.header, "\\font_sans", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_sans.")
    else:
        # We need to use this regex since split() does not handle quote protection
        sffont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
        sf = sffont[1].strip('"')
        if sf == "IBMPlexSansSemibold":
            sffont[1] = '"IBMPlexSans"'
            document.header[i] = " ".join(sffont)

            if NonTeXFonts == False:
                regexp = re.compile(r'(\\font_sans_opts)')
                x = find_re(document.header, regexp, 0)
                if x == -1:
                    # Sensible place to insert tag
                    fo = find_token(document.header, "\\font_sf_scale")
                    if fo == -1:
                        document.warning("Malformed LyX document! Missing \\font_sf_scale")
                    else:
                        document.header.insert(fo, "\\font_sans_opts \"semibold\"")
                else:
                    # We need to use this regex since split() does not handle quote protection
                    sfopts = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
                    document.header[x] = "\\font_sans_opts \"semibold, " + sfopts[1].strip('"') + "\""

    i = find_token(document.header, "\\font_typewriter", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_typewriter.")
    else:
        # We need to use this regex since split() does not handle quote protection
        ttfont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
        tt = ttfont[1].strip('"')
        if tt == "IBMPlexMonoSemibold":
            ttfont[1] = '"IBMPlexMono"'
            document.header[i] = " ".join(ttfont)

            if NonTeXFonts == False:
                regexp = re.compile(r'(\\font_typewriter_opts)')
                x = find_re(document.header, regexp, 0)
                if x == -1:
                    # Sensible place to insert tag
                    fo = find_token(document.header, "\\font_tt_scale")
                    if fo == -1:
                        document.warning("Malformed LyX document! Missing \\font_tt_scale")
                    else:
                        document.header.insert(fo, "\\font_typewriter_opts \"semibold\"")
                else:
                    # We need to use this regex since split() does not handle quote protection
                    ttopts = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
                    document.header[x] = "\\font_typewriter_opts \"semibold, " + sfopts[1].strip('"') + "\""


def convert_NotoRegulars(document):
    " Merge diverse noto reagular fonts "

    i = find_token(document.header, "\\font_roman", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_roman.")
    else:
        # We need to use this regex since split() does not handle quote protection
        romanfont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
        roman = romanfont[1].strip('"')
        if roman == "NotoSerif-TLF":
            romanfont[1] = '"NotoSerifRegular"'
            document.header[i] = " ".join(romanfont)

    i = find_token(document.header, "\\font_sans", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_sans.")
    else:
        # We need to use this regex since split() does not handle quote protection
        sffont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
        sf = sffont[1].strip('"')
        if sf == "NotoSans-TLF":
            sffont[1] = '"NotoSansRegular"'
            document.header[i] = " ".join(sffont)

    i = find_token(document.header, "\\font_typewriter", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_typewriter.")
    else:
        # We need to use this regex since split() does not handle quote protection
        ttfont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
        tt = ttfont[1].strip('"')
        if tt == "NotoMono-TLF":
            ttfont[1] = '"NotoMonoRegular"'
            document.header[i] = " ".join(ttfont)


def convert_CrimsonProFont(document):
    " Handle CrimsonPro font definition to LaTeX "

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fm = createFontMapping(['CrimsonPro'])
        convert_fonts(document, fm, "lf")

def revert_CrimsonProFont(document):
    " Revert native CrimsonPro font definition to LaTeX "

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fontmap = dict()
        fm = createFontMapping(['CrimsonPro'])
        if revert_fonts(document, fm, fontmap, False, True):
            add_preamble_fonts(document, fontmap)


def revert_pagesizes(document):
    " Revert new page sizes in memoir and KOMA to options "

    if document.textclass != "memoir" and document.textclass[:2] != "scr":
        return

    i = find_token(document.header, "\\use_geometry true", 0)
    if i != -1:
        return

    defsizes = ["default", "custom", "letterpaper", "legalpaper", "executivepaper", "a4paper", "a5paper", "b5paper"]

    i = find_token(document.header, "\\papersize", 0)
    if i == -1:
        document.warning("Malformed LyX document! Missing \\papersize header.")
        return
    val = get_value(document.header, "\\papersize", i)
    if val in defsizes:
        # nothing to do
        return

    document.header[i] = "\\papersize default"

    i = find_token(document.header, "\\options", 0)
    if i == -1:
        i = find_token(document.header, "\\textclass", 0)
        if i == -1:
            document.warning("Malformed LyX document! Missing \\textclass header.")
            return
        document.header.insert(i, "\\options " + val)
        return
    document.header[i] = document.header[i] + "," + val


def convert_pagesizes(document):
    " Convert to new page sizes in memoir and KOMA to options "

    if document.textclass != "memoir" and document.textclass[:3] != "scr":
        return

    i = find_token(document.header, "\\use_geometry true", 0)
    if i != -1:
        return

    defsizes = ["default", "custom", "letterpaper", "legalpaper", "executivepaper", "a4paper", "a5paper", "b5paper"]

    i = find_token(document.header, "\\papersize", 0)
    if i == -1:
        document.warning("Malformed LyX document! Missing \\papersize header.")
        return
    val = get_value(document.header, "\\papersize", i)
    if val in defsizes:
        # nothing to do
        return

    i = find_token(document.header, "\\use_geometry false", 0)
    if i != -1:
        # Maintain use of geometry
        document.header[1] = "\\use_geometry true"

def revert_komafontsizes(document):
    " Revert new font sizes in KOMA to options "

    if document.textclass[:3] != "scr":
        return

    i = find_token(document.header, "\\paperfontsize", 0)
    if i == -1:
        document.warning("Malformed LyX document! Missing \\paperfontsize header.")
        return

    defsizes = ["default", "10", "11", "12"]

    val = get_value(document.header, "\\paperfontsize", i)
    if val in defsizes:
        # nothing to do
        return

    document.header[i] = "\\paperfontsize default"

    fsize = "fontsize=" + val

    i = find_token(document.header, "\\options", 0)
    if i == -1:
        i = find_token(document.header, "\\textclass", 0)
        if i == -1:
            document.warning("Malformed LyX document! Missing \\textclass header.")
            return
        document.header.insert(i, "\\options " + fsize)
        return
    document.header[i] = document.header[i] + "," + fsize


def revert_dupqualicites(document):
    " Revert qualified citation list commands with duplicate keys to ERT "

    # LyX 2.3 only supports qualified citation lists with unique keys. Thus,
    # we need to revert those with multiple uses of the same key.

    # Get cite engine
    engine = "basic"
    i = find_token(document.header, "\\cite_engine", 0)
    if i == -1:
        document.warning("Malformed document! Missing \\cite_engine")
    else:
        engine = get_value(document.header, "\\cite_engine", i)

    if not engine in ["biblatex", "biblatex-natbib"]:
        return

    # Citation insets that support qualified lists, with their LaTeX code
    ql_citations = {
        "cite" : "cites",
        "Cite" : "Cites",
        "citet" : "textcites",
        "Citet" : "Textcites",
        "citep" : "parencites",
        "Citep" : "Parencites",
        "Footcite" : "Smartcites",
        "footcite" : "smartcites",
        "Autocite" : "Autocites",
        "autocite" : "autocites",
        }

    i = 0
    while (True):
        i = find_token(document.body, "\\begin_inset CommandInset citation", i)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Can't find end of citation inset at line %d!!" %(i))
            i += 1
            continue

        k = find_token(document.body, "LatexCommand", i, j)
        if k == -1:
            document.warning("Can't find LatexCommand for citation inset at line %d!" %(i))
            i = j + 1
            continue

        cmd = get_value(document.body, "LatexCommand", k)
        if not cmd in list(ql_citations.keys()):
            i = j + 1
            continue

        pres = find_token(document.body, "pretextlist", i, j)
        posts = find_token(document.body, "posttextlist", i, j)
        if pres == -1 and posts == -1:
            # nothing to do.
            i = j + 1
            continue

        key = get_quoted_value(document.body, "key", i, j)
        if not key:
            document.warning("Citation inset at line %d does not have a key!" %(i))
            i = j + 1
            continue

        keys = key.split(",")
        ukeys = list(set(keys))
        if len(keys) == len(ukeys):
            # no duplicates.
            i = j + 1
            continue

        pretexts = get_quoted_value(document.body, "pretextlist", pres)
        posttexts = get_quoted_value(document.body, "posttextlist", posts)

        pre = get_quoted_value(document.body, "before", i, j)
        post = get_quoted_value(document.body, "after", i, j)
        prelist = pretexts.split("\t")
        premap = dict()
        for pp in prelist:
            ppp = pp.split(" ", 1)
            val = ""
            if len(ppp) > 1:
                val = ppp[1]
            else:
                val = ""
            if ppp[0] in premap:
                premap[ppp[0]] = premap[ppp[0]] + "\t" + val
            else:
                premap[ppp[0]] = val
        postlist = posttexts.split("\t")
        postmap = dict()
        num = 1
        for pp in postlist:
            ppp = pp.split(" ", 1)
            val = ""
            if len(ppp) > 1:
                val = ppp[1]
            else:
                val = ""
            if ppp[0] in postmap:
                postmap[ppp[0]] = postmap[ppp[0]] + "\t" + val
            else:
                postmap[ppp[0]] = val
        # Replace known new commands with ERT
        if "(" in pre or ")" in pre:
            pre = "{" + pre + "}"
        if "(" in post or ")" in post:
            post = "{" + post + "}"
        res = "\\" + ql_citations[cmd]
        if pre:
            res += "(" + pre + ")"
        if post:
            res += "(" + post + ")"
        elif pre:
            res += "()"
        for kk in keys:
            if premap.get(kk, "") != "":
                akeys = premap[kk].split("\t", 1)
                akey = akeys[0]
                if akey != "":
                    res += "[" + akey + "]"
                if len(akeys) > 1:
                    premap[kk] = "\t".join(akeys[1:])
                else:
                    premap[kk] = ""
            if postmap.get(kk, "") != "":
                akeys = postmap[kk].split("\t", 1)
                akey = akeys[0]
                if akey != "":
                    res += "[" + akey + "]"
                if len(akeys) > 1:
                    postmap[kk] = "\t".join(akeys[1:])
                else:
                    postmap[kk] = ""
            elif premap.get(kk, "") != "":
                res += "[]"
            res += "{" + kk + "}"
        document.body[i:j+1] = put_cmd_in_ert([res])


def convert_pagesizenames(document):
    " Convert LyX page sizes names "

    i = find_token(document.header, "\\papersize", 0)
    if i == -1:
        document.warning("Malformed LyX document! Missing \\papersize header.")
        return
    oldnames = ["letterpaper", "legalpaper", "executivepaper", \
                "a0paper", "a1paper", "a2paper", "a3paper", "a4paper", "a5paper", "a6paper", \
	        "b0paper", "b1paper", "b2paper", "b3paper", "b4paper", "b5paper", "b6paper", \
	        "c0paper", "c1paper", "c2paper", "c3paper", "c4paper", "c5paper", "c6paper"]
    val = get_value(document.header, "\\papersize", i)
    if val in oldnames:
        newval = val.replace("paper", "")
        document.header[i] = "\\papersize " + newval

def revert_pagesizenames(document):
    " Convert LyX page sizes names "

    i = find_token(document.header, "\\papersize", 0)
    if i == -1:
        document.warning("Malformed LyX document! Missing \\papersize header.")
        return
    newnames = ["letter", "legal", "executive", \
                "a0", "a1", "a2", "a3", "a4", "a5", "a6", \
	        "b0", "b1", "b2", "b3", "b4", "b5", "b6", \
	        "c0", "c1", "c2", "c3", "c4", "c5", "c6"]
    val = get_value(document.header, "\\papersize", i)
    if val in newnames:
        newval = val + "paper"
        document.header[i] = "\\papersize " + newval


def revert_theendnotes(document):
    " Reverts native support of \\theendnotes to TeX-code "

    if not "endnotes" in document.get_module_list() and not "foottoend" in document.get_module_list():
        return

    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset FloatList endnote", i + 1)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Can't find end of FloatList inset")
            continue

        document.body[i : j + 1] = put_cmd_in_ert("\\theendnotes")


def revert_enotez(document):
    " Reverts native support of enotez package to TeX-code "

    if not "enotez" in document.get_module_list() and not "foottoenotez" in document.get_module_list():
        return

    use = False
    if find_token(document.body, "\\begin_inset Flex Endnote", 0) != -1:
        use = True

    revert_flex_inset(document.body, "Endnote", "\\endnote")

    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset FloatList endnote", i + 1)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Can't find end of FloatList inset")
            continue

        use = True
        document.body[i : j + 1] = put_cmd_in_ert("\\printendnotes")

    if use:
        add_to_preamble(document, ["\\usepackage{enotez}"])
    document.del_module("enotez")
    document.del_module("foottoenotez")


def revert_memoir_endnotes(document):
    " Reverts native support of memoir endnotes to TeX-code "

    if document.textclass != "memoir":
        return

    encommand = "\\pagenote"
    modules = document.get_module_list()
    if "enotez" in modules or "foottoenotez" in modules or "endnotes" in modules or "foottoend" in modules:
        encommand = "\\endnote"

    revert_flex_inset(document.body, "Endnote", encommand)

    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset FloatList pagenote", i + 1)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Can't find end of FloatList inset")
            continue

        if document.body[i] == "\\begin_inset FloatList pagenote*":
            document.body[i : j + 1] = put_cmd_in_ert("\\printpagenotes*")
        else:
            document.body[i : j + 1] = put_cmd_in_ert("\\printpagenotes")
        add_to_preamble(document, ["\\makepagenote"])


def revert_totalheight(document):
    " Reverts graphics height parameter from totalheight to height "

    relative_heights = {
        "\\textwidth" : "text%",
        "\\columnwidth" : "col%",
        "\\paperwidth" : "page%",
        "\\linewidth" : "line%",
        "\\textheight" : "theight%",
        "\\paperheight" : "pheight%",
        "\\baselineskip " : "baselineskip%"
    }
    i = 0
    while (True):
        i = find_token(document.body, "\\begin_inset Graphics", i)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Can't find end of graphics inset at line %d!!" %(i))
            i += 1
            continue

        rx = re.compile(r'\s*special\s*(\S+)$')
        rxx = re.compile(r'(\d*\.*\d+)(\S+)$')
        k = find_re(document.body, rx, i, j)
        special = ""
        oldheight = ""
        if k != -1:
            m = rx.match(document.body[k])
            if m:
                special = m.group(1)
            mspecial = special.split(',')
            for spc in mspecial:
                if spc.startswith("height="):
                    oldheight = spc.split('=')[1]
                    ms = rxx.search(oldheight)
                    if ms:
                        oldunit = ms.group(2)
                        if oldunit in list(relative_heights.keys()):
                            oldval = str(float(ms.group(1)) * 100)
                            oldunit = relative_heights[oldunit]
                            oldheight = oldval + oldunit
                    mspecial.remove(spc)
                    break
            if len(mspecial) > 0:
                special = ",".join(mspecial)
            else:
                special = ""

        rx = re.compile(r'(\s*height\s*)(\S+)$')
        kk = find_re(document.body, rx, i, j)
        if kk != -1:
            m = rx.match(document.body[kk])
            val = ""
            if m:
                val = m.group(2)
                if k != -1:
                    if special != "":
                        val = val + "," + special
                    document.body[k] = "\tspecial " + "totalheight=" + val
                else:
                    document.body.insert(kk, "\tspecial totalheight=" + val)
                if oldheight != "":
                    document.body[kk] = m.group(1) + oldheight
                else:
                    del document.body[kk]
        elif oldheight != "":
            if special != "":
                document.body[k] = "\tspecial " + special
                document.body.insert(k, "\theight " + oldheight)
            else:
                document.body[k] = "\theight " + oldheight
        i = j + 1


def convert_totalheight(document):
    " Converts graphics height parameter from totalheight to height "

    relative_heights = {
        "text%" : "\\textwidth",
        "col%"  : "\\columnwidth",
        "page%" : "\\paperwidth",
        "line%" : "\\linewidth",
        "theight%" : "\\textheight",
        "pheight%" : "\\paperheight",
        "baselineskip%" : "\\baselineskip"
    }
    i = 0
    while (True):
        i = find_token(document.body, "\\begin_inset Graphics", i)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Can't find end of graphics inset at line %d!!" %(i))
            i += 1
            continue

        rx = re.compile(r'\s*special\s*(\S+)$')
        k = find_re(document.body, rx, i, j)
        special = ""
        newheight = ""
        if k != -1:
            m = rx.match(document.body[k])
            if m:
                special = m.group(1)
            mspecial = special.split(',')
            for spc in mspecial:
                if spc[:12] == "totalheight=":
                    newheight = spc.split('=')[1]
                    mspecial.remove(spc)
                    break
            if len(mspecial) > 0:
                special = ",".join(mspecial)
            else:
                special = ""

        rx = re.compile(r'(\s*height\s*)(\d+)(\S+)$')
        kk = find_re(document.body, rx, i, j)
        if kk != -1:
            m = rx.match(document.body[kk])
            val = ""
            if m:
                val = m.group(2)
                unit = m.group(3)
                if unit in list(relative_heights.keys()):
                    val = str(float(val) / 100)
                    unit = relative_heights[unit]
                if k != -1:
                    if special != "":
                        val = val + unit + "," + special
                    document.body[k] = "\tspecial " + "height=" + val
                else:
                    document.body.insert(kk + 1, "\tspecial height=" + val + unit)
                if newheight != "":
                    document.body[kk] = m.group(1) + newheight
                else:
                    del document.body[kk]
        elif newheight != "":
            document.body.insert(k, "\theight " + newheight)
        i = j + 1


def convert_changebars(document):
    " Converts the changebars module to native solution "

    if not "changebars" in document.get_module_list():
        return

    i = find_token(document.header, "\\output_changes", 0)
    if i == -1:
        document.warning("Malformed LyX document! Missing \\output_changes header.")
        document.del_module("changebars")
        return

    document.header.insert(i, "\\change_bars true")
    document.del_module("changebars")


def revert_changebars(document):
    " Converts native changebar param to module "

    i = find_token(document.header, "\\change_bars", 0)
    if i == -1:
        document.warning("Malformed LyX document! Missing \\change_bars header.")
        return

    val = get_value(document.header, "\\change_bars", i)

    if val == "true":
        document.add_module("changebars")

    del document.header[i]


def convert_postpone_fragile(document):
    " Adds false \\postpone_fragile_content buffer param "

    i = find_token(document.header, "\\output_changes", 0)
    if i == -1:
        document.warning("Malformed LyX document! Missing \\output_changes header.")
        return
    # Set this to false for old documents (see #2154)
    document.header.insert(i, "\\postpone_fragile_content false")


def revert_postpone_fragile(document):
    " Remove \\postpone_fragile_content buffer param "

    i = find_token(document.header, "\\postpone_fragile_content", 0)
    if i == -1:
        document.warning("Malformed LyX document! Missing \\postpone_fragile_content.")
        return

    del document.header[i]


def revert_colrow_tracking(document):
    " Remove change tag from tabular columns/rows "
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Tabular", i+1)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i+1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of tabular.")
            continue
        for k in range(i, j):
            m = re.search('^<column.*change="([^"]+)".*>$', document.body[k])
            if m:
                document.body[k] = document.body[k].replace(' change="' + m.group(1) + '"', '')
            m = re.search('^<row.*change="([^"]+)".*>$', document.body[k])
            if m:
                document.body[k] = document.body[k].replace(' change="' + m.group(1) + '"', '')


def convert_counter_maintenance(document):
    " Convert \\maintain_unincluded_children buffer param from boolean value tro tristate "

    i = find_token(document.header, "\\maintain_unincluded_children", 0)
    if i == -1:
        document.warning("Malformed LyX document! Missing \\maintain_unincluded_children.")
        return

    val = get_value(document.header, "\\maintain_unincluded_children", i)

    if val == "true":
        document.header[i] = "\\maintain_unincluded_children strict"
    else:
        document.header[i] = "\\maintain_unincluded_children no"


def revert_counter_maintenance(document):
    " Revert \\maintain_unincluded_children buffer param to previous boolean value "

    i = find_token(document.header, "\\maintain_unincluded_children", 0)
    if i == -1:
        document.warning("Malformed LyX document! Missing \\maintain_unincluded_children.")
        return

    val = get_value(document.header, "\\maintain_unincluded_children", i)

    if val == "no":
        document.header[i] = "\\maintain_unincluded_children false"
    else:
        document.header[i] = "\\maintain_unincluded_children true"


def revert_counter_inset(document):
    " Revert counter inset to ERT, where possible"
    i = 0
    needed_counters = {}
    while True:
        i = find_token(document.body, "\\begin_inset CommandInset counter", i)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Can't find end of counter inset at line %d!" % i)
            i += 1
            continue
        lyx = get_quoted_value(document.body, "lyxonly", i, j)
        if lyx == "true":
            # there is nothing we can do to affect the LyX counters
            document.body[i : j + 1] = []
            i = j + 1
            continue
        cnt = get_quoted_value(document.body, "counter", i, j)
        if not cnt:
            document.warning("No counter given for inset at line %d!" % i)
            i = j + 1
            continue

        cmd = get_quoted_value(document.body, "LatexCommand", i, j)
        document.warning(cmd)
        ert = ""
        if cmd == "set":
            val = get_quoted_value(document.body, "value", i, j)
            if not val:
                document.warning("Can't convert counter inset at line %d!" % i)
            else:
                ert = put_cmd_in_ert("\\setcounter{%s}{%s}" % (cnt, val))
        elif cmd == "addto":
            val = get_quoted_value(document.body, "value", i, j)
            if not val:
                document.warning("Can't convert counter inset at line %d!" % i)
            else:
                ert = put_cmd_in_ert("\\addtocounter{%s}{%s}" % (cnt, val))
        elif cmd == "reset":
            ert = put_cmd_in_ert("\\setcounter{%s}{0}" % (cnt))
        elif cmd == "save":
            needed_counters[cnt] = 1
            savecnt = "LyXSave" + cnt
            ert = put_cmd_in_ert("\\setcounter{%s}{\\value{%s}}" % (savecnt, cnt))
        elif cmd == "restore":
            needed_counters[cnt] = 1
            savecnt = "LyXSave" + cnt
            ert = put_cmd_in_ert("\\setcounter{%s}{\\value{%s}}" % (cnt, savecnt))
        else:
            document.warning("Unknown counter command `%s' in inset at line %d!" % (cnt, i))

        if ert:
            document.body[i : j + 1] = ert
        i += 1
        continue

    pretext = []
    for cnt in needed_counters:
        pretext.append("\\newcounter{LyXSave%s}" % (cnt))
    if pretext:
        add_to_preamble(document, pretext)


def revert_ams_spaces(document):
    "Revert InsetSpace medspace and thickspace into their TeX-code counterparts"
    Found = False
    insets = ["\\medspace{}", "\\thickspace{}"]
    for inset in insets:
        i = 0
        j = 0
        i = find_token(document.body, "\\begin_inset space " + inset, i)
        if i == -1:
            continue
        end = find_end_of_inset(document.body, i)
        subst = put_cmd_in_ert(inset)
        document.body[i : end + 1] = subst
        Found = True

    if Found == True:
        # load amsmath in the preamble if not already loaded
        i = find_token(document.header, "\\use_package amsmath 2", 0)
        if i == -1:
            add_to_preamble(document, ["\\@ifundefined{thickspace}{\\usepackage{amsmath}}{}"])
            return


def convert_parskip(document):
    " Move old parskip settings to preamble "

    i = find_token(document.header, "\\paragraph_separation skip", 0)
    if i == -1:
        return

    j = find_token(document.header, "\\defskip", 0)
    if j == -1:
        document.warning("Malformed LyX document! Missing \\defskip.")
        return

    val = get_value(document.header, "\\defskip", j)

    skipval = "\\medskipamount"
    if val == "smallskip" or val == "medskip" or val == "bigskip":
        skipval = "\\" + val + "amount"
    else:
        skipval = val

    add_to_preamble(document, ["\\setlength{\\parskip}{" + skipval + "}", "\\setlength{\\parindent}{0pt}"])

    document.header[i] = "\\paragraph_separation indent"
    document.header[j] = "\\paragraph_indentation default"


def revert_parskip(document):
    " Revert new parskip settings to preamble "

    i = find_token(document.header, "\\paragraph_separation skip", 0)
    if i == -1:
        return

    j = find_token(document.header, "\\defskip", 0)
    if j == -1:
        document.warning("Malformed LyX document! Missing \\defskip.")
        return

    val = get_value(document.header, "\\defskip", j)

    skipval = ""
    if val == "smallskip" or val == "medskip" or val == "bigskip":
        skipval = "[skip=\\" + val + "amount]"
    elif val == "fullline":
        skipval = "[skip=\\baselineskip]"
    elif val != "halfline":
        skipval = "[skip={" + val + "}]"

    add_to_preamble(document, ["\\usepackage" + skipval + "{parskip}"])

    document.header[i] = "\\paragraph_separation indent"
    document.header[j] = "\\paragraph_indentation default"


def revert_line_vspaces(document):
    " Revert fulline and halfline vspaces to TeX "
    insets = {
        "fullline*" : "\\vspace*{\\baselineskip}",
        "fullline" : "\\vspace{\\baselineskip}",
        "halfline*" : "\\vspace*{0.5\\baselineskip}",
        "halfline" : "\\vspace{0.5\\baselineskip}",
        }
    for inset in insets.keys():
        i = 0
        j = 0
        i = find_token(document.body, "\\begin_inset VSpace " + inset, i)
        if i == -1:
            continue
        end = find_end_of_inset(document.body, i)
        subst = put_cmd_in_ert(insets[inset])
        document.body[i : end + 1] = subst

def convert_libertinus_rm_fonts(document):
    """Handle Libertinus serif fonts definition to LaTeX"""

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fm = createFontMapping(['Libertinus'])
        convert_fonts(document, fm)

def revert_libertinus_rm_fonts(document):
    """Revert Libertinus serif font definition to LaTeX"""

    if not get_bool_value(document.header, "\\use_non_tex_fonts"):
        fontmap = dict()
        fm = createFontMapping(['libertinus'])
        if revert_fonts(document, fm, fontmap):
            add_preamble_fonts(document, fontmap)

def revert_libertinus_sftt_fonts(document):
    " Revert Libertinus sans and tt font definitions to LaTeX "

    if find_token(document.header, "\\use_non_tex_fonts false", 0) != -1:
        preamble = ""
        # first sf font
        i = find_token(document.header, "\\font_sans \"LibertinusSans-LF\"", 0)
        if i != -1:
            j = find_token(document.header, "\\font_sans_osf true", 0)
            if j != -1:
                add_to_preamble(document, ["\\renewcommand{\\sfdefault}{LibertinusSans-OsF}"])
                document.header[j] = "\\font_sans_osf false"
            else:
                add_to_preamble(document, ["\\renewcommand{\\sfdefault}{LibertinusSans-LF}"])
            document.header[i] = document.header[i].replace("LibertinusSans-LF", "default")
            sf_scale = 100.0
            sfval = find_token(document.header, "\\font_sf_scale", 0)
            if sfval == -1:
                document.warning("Malformed LyX document: Missing \\font_sf_scale.")
            else:
                sfscale = document.header[sfval].split()
                val = sfscale[1]
                sfscale[1] = "100"
                document.header[sfval] = " ".join(sfscale)
                try:
                    # float() can throw
                    sf_scale = float(val)
                except:
                    document.warning("Invalid font_sf_scale value: " + val)
                if sf_scale != "100.0":
                    add_to_preamble(document, ["\\renewcommand*{\\LibertinusSans@scale}{" + str(sf_scale / 100.0) + "}"])
        # now tt font
        i = find_token(document.header, "\\font_typewriter \"LibertinusMono-TLF\"", 0)
        if i != -1:
            add_to_preamble(document, ["\\renewcommand{\\ttdefault}{LibertinusMono-TLF}"])
            document.header[i] = document.header[i].replace("LibertinusMono-TLF", "default")
            tt_scale = 100.0
            ttval = find_token(document.header, "\\font_tt_scale", 0)
            if ttval == -1:
                document.warning("Malformed LyX document: Missing \\font_tt_scale.")
            else:
                ttscale = document.header[ttval].split()
                val = ttscale[1]
                ttscale[1] = "100"
                document.header[ttval] = " ".join(ttscale)
                try:
                    # float() can throw
                    tt_scale = float(val)
                except:
                    document.warning("Invalid font_tt_scale value: " + val)
                if tt_scale != "100.0":
                    add_to_preamble(document, ["\\renewcommand*{\\LibertinusMono@scale}{" + str(tt_scale / 100.0) + "}"])


def revert_docbook_table_output(document):
    i = find_token(document.header, '\\docbook_table_output')
    if i != -1:
        del document.header[i]


def revert_nopagebreak(document):
    while True:
        i = find_token(document.body, "\\begin_inset Newpage nopagebreak")
        if i == -1:
            return
        end = find_end_of_inset(document.body, i)
        if end == 1:
            document.warning("Malformed LyX document: Could not find end of Newpage inset.")
            continue
        subst = put_cmd_in_ert("\\nopagebreak{}")
        document.body[i : end + 1] = subst


def revert_hrquotes(document):
    " Revert Hungarian Quotation marks "
    
    i = find_token(document.header, "\\quotes_style hungarian", 0)
    if i != -1:
        document.header[i] = "\\quotes_style polish"

    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Quotes h")
        if i == -1:
            return
        if document.body[i] == "\\begin_inset Quotes hld":
            document.body[i] = "\\begin_inset Quotes pld"
        elif document.body[i] == "\\begin_inset Quotes hrd":
            document.body[i] = "\\begin_inset Quotes prd"
        elif document.body[i] == "\\begin_inset Quotes hls":
            document.body[i] = "\\begin_inset Quotes ald"
        elif document.body[i] == "\\begin_inset Quotes hrs":
            document.body[i] = "\\begin_inset Quotes ard"


def convert_math_refs(document):
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Formula", i)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Can't find end of inset at line %d of body!" % i)
            i += 1
            continue
        while i < j:
            document.body[i] = document.body[i].replace("\\prettyref", "\\formatted")
            i += 1
        

def revert_math_refs(document):
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Formula", i)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Can't find end of inset at line %d of body!" % i)
            i += 1
            continue
        while i < j:
            document.body[i] = document.body[i].replace("\\formatted", "\\prettyref")
            if "\\labelonly" in document.body[i]:
                document.body[i] = re.sub("\\\\labelonly{([^}]+?)}", "\\1", document.body[i])
            i += 1


def convert_branch_colors(document):
    " Convert branch colors to semantic values "

    i = 0
    while True:
        i = find_token(document.header, "\\branch", i)
        if i == -1:
            break
        j = find_token(document.header, "\\end_branch", i)
        if j == -1:
           document.warning("Malformed LyX document. Can't find end of branch definition!")
           break
        # We only support the standard LyX background for now
        k = find_token(document.header, "\\color #faf0e6", i, j)
        if k != -1:
           document.header[k] = "\\color background"
        i += 1


def revert_branch_colors(document):
    " Revert semantic branch colors "

    i = 0
    while True:
        i = find_token(document.header, "\\branch", i)
        if i == -1:
            break
        j = find_token(document.header, "\\end_branch", i)
        if j == -1:
           document.warning("Malformed LyX document. Can't find end of branch definition!")
           break
        k = find_token(document.header, "\\color", i, j)
        if k != -1:
           bcolor = get_value(document.header, "\\color", k)
           if bcolor[1] != "#":
               # this will be read as background by LyX 2.3
               document.header[k] = "\\color none"
        i += 1


def revert_darkmode_graphics(document):
    " Revert darkModeSensitive InsetGraphics param "

    i = 0
    while (True):
        i = find_token(document.body, "\\begin_inset Graphics", i)
        if i == -1:
            break
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Can't find end of graphics inset at line %d!!" %(i))
            i += 1
            continue
        k = find_token(document.body, "\tdarkModeSensitive", i, j)
        if k != -1:
            del document.body[k]
        i += 1


def revert_branch_darkcols(document):
    " Revert dark branch colors "

    i = 0
    while True:
        i = find_token(document.header, "\\branch", i)
        if i == -1:
            break
        j = find_token(document.header, "\\end_branch", i)
        if j == -1:
           document.warning("Malformed LyX document. Can't find end of branch definition!")
           break
        k = find_token(document.header, "\\color", i, j)
        if k != -1:
            m = re.search('\\\\color (\\S+) (\\S+)', document.header[k])
            if m:
                document.header[k] = "\\color " + m.group(1)
        i += 1


def revert_vcolumns2(document):
    """Revert varwidth columns with line breaks etc."""
    i = 0
    needvarwidth = False
    needarray = False
    needcellvarwidth = False
    try:
        while True:
            i = find_token(document.body, "\\begin_inset Tabular", i+1)
            if i == -1:
                return
            j = find_end_of_inset(document.body, i)
            if j == -1:
                document.warning("Malformed LyX document: Could not find end of tabular.")
                continue

            # Collect necessary column information
            m = i + 1
            nrows = int(document.body[i+1].split('"')[3])
            ncols = int(document.body[i+1].split('"')[5])
            col_info = []
            for k in range(ncols):
                m = find_token(document.body, "<column", m)
                width = get_option_value(document.body[m], 'width')
                varwidth = get_option_value(document.body[m], 'varwidth')
                alignment = get_option_value(document.body[m], 'alignment')
                valignment = get_option_value(document.body[m], 'valignment')
                special = get_option_value(document.body[m], 'special')
                col_info.append([width, varwidth, alignment, valignment, special, m])
                m += 1

            # Now parse cells
            m = i + 1
            lines = []
            for row in range(nrows):
                for col in range(ncols):
                    m = find_token(document.body, "<cell", m)
                    multicolumn = get_option_value(document.body[m], 'multicolumn') != ""
                    multirow = get_option_value(document.body[m], 'multirow') != ""
                    fixedwidth = get_option_value(document.body[m], 'width') != ""
                    rotate = get_option_value(document.body[m], 'rotate')
                    cellalign = get_option_value(document.body[m], 'alignment')
                    cellvalign = get_option_value(document.body[m], 'valignment')
                    # Check for: linebreaks, multipars, non-standard environments
                    begcell = m
                    endcell = find_token(document.body, "</cell>", begcell)
                    vcand = False
                    if find_token(document.body, "\\begin_inset Newline", begcell, endcell) != -1:
                        vcand = not fixedwidth
                    elif count_pars_in_inset(document.body, begcell + 2) > 1:
                        vcand = not fixedwidth
                    elif get_value(document.body, "\\begin_layout", begcell) != "Plain Layout":
                        vcand = not fixedwidth
                    colalignment = col_info[col][2]
                    colvalignment = col_info[col][3]
                    if vcand:
                        if rotate == "" and ((colalignment == "left" and colvalignment == "top") or (multicolumn == True and cellalign == "left" and cellvalign == "top")):
                            if col_info[col][0] == "" and col_info[col][1] == "" and col_info[col][4] == "":
                                needvarwidth = True
                                col_line = col_info[col][5]
                                needarray = True
                                vval = "V{\\linewidth}"
                                if multicolumn:
                                    document.body[m] = document.body[m][:-1] + " special=\"" + vval + "\">"
                                else:
                                    document.body[col_line] = document.body[col_line][:-1] + " special=\"" + vval + "\">"
                        else:
                            alarg = ""
                            if multicolumn or multirow:
                                if cellvalign == "middle":
                                    alarg = "[m]"
                                elif cellvalign == "bottom":
                                    alarg = "[b]"
                            else:
                                if colvalignment == "middle":
                                    alarg = "[m]"
                                elif colvalignment == "bottom":
                                    alarg = "[b]"
                            flt = find_token(document.body, "\\begin_layout", begcell, endcell)
                            elt = find_token_backwards(document.body, "\\end_layout", endcell)
                            if flt != -1 and elt != -1:
                                extralines = []
                                # we need to reset character layouts if necessary
                                el = find_token(document.body, '\\emph on', flt, elt)
                                if el != -1:
                                    extralines.append("\\emph default")
                                el = find_token(document.body, '\\noun on', flt, elt)
                                if el != -1:
                                    extralines.append("\\noun default")
                                el = find_token(document.body, '\\series', flt, elt)
                                if el != -1:
                                    extralines.append("\\series default")
                                el = find_token(document.body, '\\family', flt, elt)
                                if el != -1:
                                    extralines.append("\\family default")
                                el = find_token(document.body, '\\shape', flt, elt)
                                if el != -1:
                                    extralines.append("\\shape default")
                                el = find_token(document.body, '\\color', flt, elt)
                                if el != -1:
                                    extralines.append("\\color inherit")
                                el = find_token(document.body, '\\size', flt, elt)
                                if el != -1:
                                    extralines.append("\\size default")
                                el = find_token(document.body, '\\bar under', flt, elt)
                                if el != -1:
                                    extralines.append("\\bar default")
                                el = find_token(document.body, '\\uuline on', flt, elt)
                                if el != -1:
                                    extralines.append("\\uuline default")
                                el = find_token(document.body, '\\uwave on', flt, elt)
                                if el != -1:
                                    extralines.append("\\uwave default")
                                el = find_token(document.body, '\\strikeout on', flt, elt)
                                if el != -1:
                                    extralines.append("\\strikeout default")
                                document.body[elt:elt+1] = extralines + put_cmd_in_ert("\\end{cellvarwidth}") + [r"\end_layout"]
                                parlang = -1
                                for q in range(flt, elt):
                                    if document.body[q] != "" and document.body[q][0] != "\\":
                                        break
                                    if document.body[q][:5] == "\\lang":
                                        parlang = q
                                        break
                                if parlang != -1:
                                    document.body[parlang+1:parlang+1] = put_cmd_in_ert("\\begin{cellvarwidth}" + alarg)
                                else:
                                    document.body[flt+1:flt+1] = put_cmd_in_ert("\\begin{cellvarwidth}" + alarg)
                                needcellvarwidth = True
                                needvarwidth = True
                        # ERT newlines and linebreaks (since LyX < 2.4 automatically inserts parboxes
                        # with newlines, and we do not want that)
                        while True:
                            endcell = find_token(document.body, "</cell>", begcell)
                            linebreak = False
                            nl = find_token(document.body, "\\begin_inset Newline newline", begcell, endcell)
                            if nl == -1:
                                nl = find_token(document.body, "\\begin_inset Newline linebreak", begcell, endcell)
                                if nl == -1:
                                     break
                                linebreak = True
                            nle = find_end_of_inset(document.body, nl)
                            del(document.body[nle:nle+1])
                            if linebreak:
                                document.body[nl:nl+1] = put_cmd_in_ert("\\linebreak{}")
                            else:
                                document.body[nl:nl+1] = put_cmd_in_ert("\\\\")
                        # Replace parbreaks in multirow with \\endgraf
                        if multirow == True:
                            flt = find_token(document.body, "\\begin_layout", begcell, endcell)
                            if flt != -1:
                                while True:
                                    elt = find_end_of_layout(document.body, flt)
                                    if elt == -1:
                                        document.warning("Malformed LyX document! Missing layout end.")
                                        break
                                    endcell = find_token(document.body, "</cell>", begcell)
                                    flt = find_token(document.body, "\\begin_layout", elt, endcell)
                                    if flt == -1:
                                        break
                                    document.body[elt : flt + 1] = put_cmd_in_ert("\\endgraf{}")
                    m += 1

            i = j

    finally:
        if needarray == True:
            add_to_preamble(document, ["\\usepackage{array}"])
        if needcellvarwidth == True:
            add_to_preamble(document, ["%% Variable width box for table cells",
                                       "\\newenvironment{cellvarwidth}[1][t]",
                                       "    {\\begin{varwidth}[#1]{\\linewidth}}",
                                       "    {\\@finalstrut\\@arstrutbox\\end{varwidth}}"])
        if needvarwidth == True:
            add_to_preamble(document, ["\\usepackage{varwidth}"])


def convert_vcolumns2(document):
    """Convert varwidth ERT to native"""
    i = 0
    try:
        while True:
            i = find_token(document.body, "\\begin_inset Tabular", i+1)
            if i == -1:
                return
            j = find_end_of_inset(document.body, i)
            if j == -1:
                document.warning("Malformed LyX document: Could not find end of tabular.")
                continue

            # Parse cells
            nrows = int(document.body[i+1].split('"')[3])
            ncols = int(document.body[i+1].split('"')[5])
            m = i + 1
            lines = []
            for row in range(nrows):
                for col in range(ncols):
                    m = find_token(document.body, "<cell", m)
                    multirow = get_option_value(document.body[m], 'multirow') != ""
                    begcell = m
                    endcell = find_token(document.body, "</cell>", begcell)
                    vcand = False
                    cvw = find_token(document.body, "begin{cellvarwidth}", begcell, endcell)
                    if cvw != -1:
                        vcand = document.body[cvw - 1] == "\\backslash" and get_containing_inset(document.body, cvw)[0] == "ERT"
                    if vcand:
                        # Remove ERTs with cellvarwidth env
                        ecvw = find_token(document.body, "end{cellvarwidth}", begcell, endcell)
                        if ecvw != -1:
                            if document.body[ecvw - 1] == "\\backslash":
                                eertins = get_containing_inset(document.body, ecvw)
                                if eertins and eertins[0] == "ERT":
                                    del document.body[eertins[1] : eertins[2] + 1]
                             
                        cvw = find_token(document.body, "begin{cellvarwidth}", begcell, endcell)   
                        ertins = get_containing_inset(document.body, cvw)
                        if ertins and ertins[0] == "ERT":
                            del(document.body[ertins[1] : ertins[2] + 1])
                        
                        # Convert ERT newlines (as cellvarwidth detection relies on that)
                        while True:
                            endcell = find_token(document.body, "</cell>", begcell)
                            nl = find_token(document.body, "\\backslash", begcell, endcell)
                            if nl == -1 or document.body[nl + 2] != "\\backslash":
                                break
                            ertins = get_containing_inset(document.body, nl)
                            if ertins and ertins[0] == "ERT":
                                document.body[ertins[1] : ertins[2] + 1] = ["\\begin_inset Newline newline", "", "\\end_inset"]

                        # Same for linebreaks
                        while True:
                            endcell = find_token(document.body, "</cell>", begcell)
                            nl = find_token(document.body, "linebreak", begcell, endcell)
                            if nl == -1 or document.body[nl - 1] != "\\backslash":
                                break
                            ertins = get_containing_inset(document.body, nl)
                            if ertins and ertins[0] == "ERT":
                                document.body[ertins[1] : ertins[2] + 1] = ["\\begin_inset Newline linebreak", "", "\\end_inset"]

                        # And \\endgraf
                        if multirow == True:
                            endcell = find_token(document.body, "</cell>", begcell)
                            nl = find_token(document.body, "endgraf{}", begcell, endcell)
                            if nl == -1 or document.body[nl - 1] != "\\backslash":
                                break
                            ertins = get_containing_inset(document.body, nl)
                            if ertins and ertins[0] == "ERT":
                                    document.body[ertins[1] : ertins[2] + 1] = ["\\end_layout", "", "\\begin_layout Plain Layout"]
                    m += 1

            i += 1

    finally:
        del_complete_lines(document.preamble,
                                ['% Added by lyx2lyx',
                                 '%% Variable width box for table cells',
                                 r'\newenvironment{cellvarwidth}[1][t]',
                                 r'    {\begin{varwidth}[#1]{\linewidth}}',
                                 r'    {\@finalstrut\@arstrutbox\end{varwidth}}'])
        del_complete_lines(document.preamble,
                                ['% Added by lyx2lyx',
                                 r'\usepackage{varwidth}'])


frontispiece_def = [
    r'### Inserted by lyx2lyx (frontispiece layout) ###',
    r'Style Frontispiece',
    r'  CopyStyle             Titlehead',
    r'  LatexName             frontispiece',
    r'End',
]


def convert_koma_frontispiece(document):
    """Remove local KOMA frontispiece definition"""
    if document.textclass[:3] != "scr":
        return

    if document.del_local_layout(frontispiece_def):
        document.add_module("ruby")


def revert_koma_frontispiece(document):
    """Add local KOMA frontispiece definition"""
    if document.textclass[:3] != "scr":
        return

    if find_token(document.body, "\\begin_layout Frontispiece", 0) != -1:
        document.append_local_layout(frontispiece_def)


def revert_spellchecker_ignore(document):
    """Revert document spellchecker dictionary"""
    while True:
        i = find_token(document.header, "\\spellchecker_ignore")
        if i == -1:
            return
        del document.header[i]


def revert_docbook_mathml_prefix(document):
    """Revert the DocBook parameter to choose the prefix for the MathML name space"""
    while True:
        i = find_token(document.header, "\\docbook_mathml_prefix")
        if i == -1:
            return
        del document.header[i]

def revert_document_metadata(document):
    """Revert document metadata"""
    i = 0
    while True:
        i = find_token(document.header, "\\begin_metadata", i)
        if i == -1:
            return
        j = find_end_of(document.header, i, "\\begin_metadata", "\\end_metadata")
        if j == -1:
            # this should not happen
            break
        document.header[i : j + 1] = []

##
# Conversion hub
#

supported_versions = ["2.4.0", "2.4"]
convert = [
           [545, [convert_lst_literalparam]],
           [546, []],
           [547, []],
           [548, []],
           [549, []],
           [550, [convert_fontenc]],
           [551, []],
           [552, []],
           [553, []],
           [554, []],
           [555, []],
           [556, []],
           [557, [convert_vcsinfo]],
           [558, [removeFrontMatterStyles]],
           [559, []],
           [560, []],
           [561, [convert_latexFonts]],  # Handle dejavu, ibmplex fonts in GUI
           [562, []],
           [563, []],
           [564, []],
           [565, [convert_AdobeFonts]],  # Handle adobe fonts in GUI
           [566, [convert_hebrew_parentheses]],
           [567, []],
           [568, []],
           [569, []],
           [570, []],
           [571, []],
           [572, [convert_notoFonts]],  # Added options thin, light, extralight for Noto
           [573, [convert_inputencoding_namechange]],
           [574, [convert_ruby_module, convert_utf8_japanese]],
           [575, [convert_lineno, convert_aaencoding]],
           [576, []],
           [577, [convert_linggloss]],
           [578, []],
           [579, []],
           [580, []],
           [581, [convert_osf]],
           [582, [convert_AdobeFonts,convert_latexFonts,convert_notoFonts,convert_CantarellFont,convert_FiraFont]],# old font re-converterted due to extra options
           [583, [convert_ChivoFont,convert_Semibolds,convert_NotoRegulars,convert_CrimsonProFont]],
           [584, []],
           [585, [convert_pagesizes]],
           [586, []],
           [587, [convert_pagesizenames]],
           [588, []],
           [589, [convert_totalheight]],
           [590, [convert_changebars]],
           [591, [convert_postpone_fragile]],
           [592, []],
           [593, [convert_counter_maintenance]],
           [594, []],
           [595, []],
           [596, [convert_parskip]],
           [597, [convert_libertinus_rm_fonts]],
           [598, []],
           [599, []],
           [600, []],
           [601, [convert_math_refs]],
           [602, [convert_branch_colors]],
           [603, []],
           [604, []],
           [605, [convert_vcolumns2]],
           [606, [convert_koma_frontispiece]],
           [607, []],
           [608, []],
           [609, []]
          ]

revert =  [[608, [revert_document_metadata]],
           [607, [revert_docbook_mathml_prefix]],
           [606, [revert_spellchecker_ignore]],
           [605, [revert_koma_frontispiece]],
           [604, [revert_vcolumns2]],
           [603, [revert_branch_darkcols]],
           [602, [revert_darkmode_graphics]],
           [601, [revert_branch_colors]],
           [600, []],
           [599, [revert_math_refs]],
           [598, [revert_hrquotes]],
           [598, [revert_nopagebreak]],
           [597, [revert_docbook_table_output]],
           [596, [revert_libertinus_rm_fonts,revert_libertinus_sftt_fonts]],
           [595, [revert_parskip,revert_line_vspaces]],
           [594, [revert_ams_spaces]],
           [593, [revert_counter_inset]],
           [592, [revert_counter_maintenance]],
           [591, [revert_colrow_tracking]],
           [590, [revert_postpone_fragile]],
           [589, [revert_changebars]],
           [588, [revert_totalheight]],
           [587, [revert_memoir_endnotes,revert_enotez,revert_theendnotes]],
           [586, [revert_pagesizenames]],
           [585, [revert_dupqualicites]],
           [584, [revert_pagesizes,revert_komafontsizes]],
           [583, [revert_vcsinfo_rev_abbrev]],
           [582, [revert_ChivoFont,revert_CrimsonProFont]],
           [581, [revert_CantarellFont,revert_FiraFont]],
           [580, [revert_texfontopts,revert_osf]],
           [579, [revert_minionpro, revert_plainNotoFonts_xopts, revert_notoFonts_xopts, revert_IBMFonts_xopts, revert_AdobeFonts_xopts, revert_font_opts]], # keep revert_font_opts last!
           [578, [revert_babelfont]],
           [577, [revert_drs]],
           [576, [revert_linggloss, revert_subexarg]],
           [575, [revert_new_languages]],
           [574, [revert_lineno, revert_aaencoding]],
           [573, [revert_ruby_module, revert_utf8_japanese]],
           [572, [revert_inputencoding_namechange]],
           [571, [revert_notoFonts]],
           [570, [revert_cmidruletrimming]],
           [569, [revert_bibfileencodings]],
           [568, [revert_tablestyle]],
           [567, [revert_soul]],
           [566, [revert_malayalam]],
           [565, [revert_hebrew_parentheses]],
           [564, [revert_AdobeFonts]],
           [563, [revert_lformatinfo]],
           [562, [revert_listpargs]],
           [561, [revert_l7ninfo]],
           [560, [revert_latexFonts]],  # Handle dejavu, ibmplex fonts in user preamble
           [559, [revert_timeinfo, revert_namenoextinfo]],
           [558, [revert_dateinfo]],
           [557, [addFrontMatterStyles]],
           [556, [revert_vcsinfo]],
           [555, [revert_bibencoding]],
           [554, [revert_vcolumns]],
           [553, [revert_stretchcolumn]],
           [552, [revert_tuftecite]],
           [551, [revert_floatpclass, revert_floatalignment]],
           [550, [revert_nospellcheck]],
           [549, [revert_fontenc]],
           [548, []],  # dummy format change
           [547, [revert_lscape]],
           [546, [revert_xcharter]],
           [545, [revert_paratype]],
           [544, [revert_lst_literalparam]]
          ]


if __name__ == "__main__":
    pass