# -*- coding: utf-8 -*-
# This file is part of lyx2lyx
# Copyright (C) 2011 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

""" Convert files to the file format generated by lyx 2.0"""

import re, string
import unicodedata
import sys, os

from parser_tools import del_complete_lines, \
  find_token, find_end_of, find_tokens, \
  find_token_exact, find_end_of_inset, find_end_of_layout, \
  find_token_backwards, is_in_inset, get_value, get_quoted_value, \
  del_token, check_token, get_option_value

from lyx2lyx_tools import add_to_preamble, insert_to_preamble, \
  put_cmd_in_ert, lyx2latex, latex_length, revert_flex_inset, \
  revert_font_attrs, hex2ratio, str2bool, revert_language

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

def remove_option(lines, m, option):
    ''' removes option from line m. returns whether we did anything '''
    l = lines[m].find(option)
    if l == -1:
        return False
    val = lines[m][l:].split('"')[1]
    lines[m] = lines[m][:l - 1] + lines[m][l+len(option + '="' + val + '"'):]
    return True


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

def revert_swiss(document):
    " Set language german-ch to ngerman "
    i = 0
    if document.language == "german-ch":
        document.language = "ngerman"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language ngerman"
    j = 0
    while True:
        j = find_token(document.body, "\\lang german-ch", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang german-ch", "\\lang ngerman")
        j = j + 1


def revert_tabularvalign(document):
   " Revert the tabular valign option "
   i = 0
   while True:
      i = find_token(document.body, "\\begin_inset Tabular", i)
      if i == -1:
          return
      end = find_end_of_inset(document.body, i)
      if end == -1:
          document.warning("Can't find end of inset at line " + str(i))
          i += 1
          continue
      fline = find_token(document.body, "<features", i, end)
      if fline == -1:
          document.warning("Can't find features for inset at line " + str(i))
          i += 1
          continue
      p = document.body[fline].find("islongtable")
      if p != -1:
          q = document.body[fline].find("tabularvalignment")
          if q != -1:
              document.body[fline] = re.sub(r' tabularvalignment=\"[a-z]+\"', "", document.body[fline])
          i += 1
          continue

       # no longtable
      tabularvalignment = 'c'
      # which valignment is specified?
      m = document.body[fline].find('tabularvalignment="top"')
      if m != -1:
          tabularvalignment = 't'
      m = document.body[fline].find('tabularvalignment="bottom"')
      if m != -1:
          tabularvalignment = 'b'
      # delete tabularvalignment
      q = document.body[fline].find("tabularvalignment")
      if q != -1:
          document.body[fline] = re.sub(r' tabularvalignment=\"[a-z]+\"', "", document.body[fline])

      # don't add a box when centered
      if tabularvalignment == 'c':
          i = end
          continue
      subst = ['\\end_inset', '\\end_layout']
      document.body[end:end] = subst # just inserts those lines
      subst = ['\\begin_inset Box Frameless',
          'position "' + tabularvalignment +'"',
          'hor_pos "c"',
          'has_inner_box 1',
          'inner_pos "c"',
          'use_parbox 0',
          # we don't know the width, assume 50%
          'width "50col%"',
          'special "none"',
          'height "1in"',
          'height_special "totalheight"',
          'status open',
          '',
          '\\begin_layout Plain Layout']
      document.body[i:i] = subst # this just inserts the array at i
      # since there could be a tabular inside a tabular, we cannot
      # jump to end
      i += len(subst)


def revert_phantom_types(document, ptype, cmd):
    " Reverts phantom to ERT "
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset Phantom " + ptype, i)
      if i == -1:
          return
      end = find_end_of_inset(document.body, i)
      if end == -1:
          document.warning("Can't find end of inset at line " + str(i))
          i += 1
          continue
      blay = find_token(document.body, "\\begin_layout Plain Layout", i, end)
      if blay == -1:
          document.warning("Can't find layout for inset at line " + str(i))
          i = end
          continue
      bend = find_end_of_layout(document.body, blay)
      if bend == -1:
          document.warning("Malformed LyX document: Could not find end of Phantom inset's layout.")
          i = end
          continue
      substi = ["\\begin_inset ERT", "status collapsed", "",
                "\\begin_layout Plain Layout", "", "", "\\backslash",
                cmd + "{", "\\end_layout", "", "\\end_inset"]
      substj = ["\\size default", "", "\\begin_inset ERT", "status collapsed", "",
                "\\begin_layout Plain Layout", "", "}", "\\end_layout", "", "\\end_inset"]
      # do the later one first so as not to mess up the numbering
      document.body[bend:end + 1] = substj
      document.body[i:blay + 1] = substi
      i = end + len(substi) + len(substj) - (end - bend) - (blay - i) - 2


def revert_phantom(document):
    revert_phantom_types(document, "Phantom", "phantom")

def revert_hphantom(document):
    revert_phantom_types(document, "HPhantom", "hphantom")

def revert_vphantom(document):
    revert_phantom_types(document, "VPhantom", "vphantom")


def revert_xetex(document):
    " Reverts documents that use XeTeX "

    i = find_token(document.header, '\\use_xetex', 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\use_xetex.")
        return
    if not str2bool(get_value(document.header, "\\use_xetex", i)):
        del document.header[i]
        return
    del document.header[i]

    # 1.) set doc encoding to utf8-plain
    i = find_token(document.header, "\\inputencoding", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\inputencoding.")
    else:
        document.header[i] = "\\inputencoding utf8-plain"

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

    i = find_token(document.header, "\\font_roman", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_roman.")
    else:
        roman = get_value(document.header, "\\font_roman", i)
        document.header[i] = "\\font_roman default"

    i = find_token(document.header, "\\font_sans", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_sans.")
    else:
        sans = get_value(document.header, "\\font_sans", i)
        document.header[i] = "\\font_sans default"

    i = find_token(document.header, "\\font_typewriter", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_typewriter.")
    else:
        typew = get_value(document.header, "\\font_typewriter", i)
        document.header[i] = "\\font_typewriter default"

    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))
        document.header[i] = "\\font_osf false"

    i = find_token(document.header, "\\font_sc", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\font_sc.")
    else:
        # we do not need this value.
        document.header[i] = "\\font_sc false"

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

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

    # 3.) set preamble stuff
    pretext = ['%% This document must be processed with xelatex!']
    pretext.append('\\usepackage{fontspec}')
    if roman != "default":
        pretext.append('\\setmainfont[Mapping=tex-text]{' + roman + '}')
    if sans != "default":
        sf = '\\setsansfont['
        if sf_scale != 100.0:
            sf += 'Scale=' + str(sf_scale / 100.0) + ','
        sf += 'Mapping=tex-text]{' + sans + '}'
        pretext.append(sf)
    if typew != "default":
        tw = '\\setmonofont'
        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('\\usepackage{xunicode}')
    pretext.append('\\usepackage{xltxtra}')
    insert_to_preamble(document, pretext)


def revert_outputformat(document):
    " Remove default output format param "

    if not del_token(document.header, '\\default_output_format', 0):
        document.warning("Malformed LyX document: Missing \\default_output_format.")


def revert_backgroundcolor(document):
    " Reverts background color to preamble code "
    i = find_token(document.header, "\\backgroundcolor", 0)
    if i == -1:
        return
    colorcode = get_value(document.header, '\\backgroundcolor', i)
    del document.header[i]
    # don't clutter the preamble if backgroundcolor is not set
    if colorcode == "#ffffff":
        return
    red   = hex2ratio(colorcode[1:3])
    green = hex2ratio(colorcode[3:5])
    blue  = hex2ratio(colorcode[5:7])
    insert_to_preamble(document, \
        ['% To set the background color',
        '\\@ifundefined{definecolor}{\\usepackage{color}}{}',
        '\\definecolor{page_backgroundcolor}{rgb}{' + red + ',' + green + ',' + blue + '}',
        '\\pagecolor{page_backgroundcolor}'])


def add_use_indices(document):
    " Add \\use_indices if it is missing "
    i = find_token(document.header, '\\use_indices', 0)
    if i != -1:
        return i
    i = find_token(document.header, '\\use_bibtopic', 0)
    if i == -1:
        i = find_token(document.header, '\\cite_engine', 0)
    if i == -1:
        i = find_token(document.header, '\\use_mathdots', 0)
    if i == -1:
        i = find_token(document.header, '\\use_mhchem', 0)
    if i == -1:
        i = find_token(document.header, '\\use_esint', 0)
    if i == -1:
        i = find_token(document.header, '\\use_amsmath', 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing \\use_indices.")
        return -1
    document.header.insert(i + 1, '\\use_indices 0')
    return i + 1


def revert_splitindex(document):
    " Reverts splitindex-aware documents "
    i = add_use_indices(document)
    if i == -1:
        return
    useindices = str2bool(get_value(document.header, "\\use_indices", i))
    del document.header[i]
    preamble = []
    if useindices:
         preamble.append("\\usepackage{splitidx})")

    # deal with index declarations in the preamble
    i = 0
    while True:
        i = find_token(document.header, "\\index", i)
        if i == -1:
            break
        k = find_token(document.header, "\\end_index", i)
        if k == -1:
            document.warning("Malformed LyX document: Missing \\end_index.")
            return
        if useindices:
          line = document.header[i]
          l = re.compile(r'\\index (.*)$')
          m = l.match(line)
          iname = m.group(1)
          ishortcut = get_value(document.header, '\\shortcut', i, k)
          if ishortcut != "":
              preamble.append("\\newindex[" + iname + "]{" + ishortcut + "}")
        del document.header[i:k + 1]
    if preamble:
        insert_to_preamble(document, preamble)

    # deal with index insets
    # these need to have the argument removed
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Index", i)
        if i == -1:
            break
        line = document.body[i]
        l = re.compile(r'\\begin_inset Index (.*)$')
        m = l.match(line)
        itype = m.group(1)
        if itype == "idx" or useindices == "false":
            document.body[i] = "\\begin_inset Index"
        else:
            k = find_end_of_inset(document.body, i)
            if k == -1:
                document.warning("Can't find end of index inset!")
                i += 1
                continue
            content = lyx2latex(document, document.body[i:k])
            # escape quotes
            content = content.replace('"', r'\"')
            subst = put_cmd_in_ert("\\sindex[" + itype + "]{" + content + "}")
            document.body[i:k + 1] = subst
        i = i + 1

    # deal with index_print insets
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset CommandInset index_print", i)
        if i == -1:
            return
        k = find_end_of_inset(document.body, i)
        ptype = get_quoted_value(document.body, 'type', i, k)
        if ptype == "idx":
            j = find_token(document.body, "type", i, k)
            del document.body[j]
        elif not useindices:
            del document.body[i:k + 1]
        else:
            subst = put_cmd_in_ert("\\printindex[" + ptype + "]{}")
            document.body[i:k + 1] = subst
        i = i + 1


def convert_splitindex(document):
    " Converts index and printindex insets to splitindex-aware format "
    add_use_indices(document)
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Index", i)
        if i == -1:
            break
        document.body[i] = document.body[i].replace("\\begin_inset Index",
            "\\begin_inset Index idx")
        i = i + 1
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset CommandInset index_print", i)
        if i == -1:
            return
        if document.body[i + 1].find('LatexCommand printindex') == -1:
            document.warning("Malformed LyX document: Incomplete printindex inset.")
            return
        subst = ["LatexCommand printindex",
            "type \"idx\""]
        document.body[i + 1:i + 2] = subst
        i = i + 1


def revert_subindex(document):
    " Reverts \\printsubindex CommandInset types "
    i = add_use_indices(document)
    if i == -1:
        return
    useindices = str2bool(get_value(document.header, "\\use_indices", i))
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset CommandInset index_print", i)
        if i == -1:
            return
        k = find_end_of_inset(document.body, i)
        ctype = get_value(document.body, 'LatexCommand', i, k)
        if ctype != "printsubindex":
            i = k + 1
            continue
        ptype = get_quoted_value(document.body, 'type', i, k)
        if not useindices:
            del document.body[i:k + 1]
        else:
            subst = put_cmd_in_ert("\\printsubindex[" + ptype + "]{}")
            document.body[i:k + 1] = subst
        i = i + 1


def revert_printindexall(document):
    " Reverts \\print[sub]index* CommandInset types "
    i = add_use_indices(document)
    if i == -1:
        return
    useindices = str2bool(get_value(document.header, "\\use_indices", i))
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset CommandInset index_print", i)
        if i == -1:
            return
        k = find_end_of_inset(document.body, i)
        ctype = get_value(document.body, 'LatexCommand', i, k)
        if ctype != "printindex*" and ctype != "printsubindex*":
            i = k
            continue
        if not useindices:
            del document.body[i:k + 1]
        else:
            subst = put_cmd_in_ert("\\" + ctype + "{}")
            document.body[i:k + 1] = subst
        i = i + 1

strikeout_preamble = ['%  for proper underlining',
                      r'\PassOptionsToPackage{normalem}{ulem}',
                      r'\usepackage{ulem}']

def convert_strikeout(document):
    " Remove preamble code loading 'ulem' package. "
    del_complete_lines(document.preamble,
                       ['% Added by lyx2lyx']+strikeout_preamble)


def revert_strikeout(document):
  " Reverts \\strikeout font attribute "
  changed = revert_font_attrs(document.body, "\\uuline", "\\uuline")
  changed = revert_font_attrs(document.body, "\\uwave", "\\uwave") or changed
  changed = revert_font_attrs(document.body, "\\strikeout", "\\sout")  or changed
  if changed == True:
    insert_to_preamble(document, strikeout_preamble)


ulinelatex_preamble = ['% fix underbar in citations',
    r'\let\cite@rig\cite',
    r'\newcommand{\b@xcite}[2][\%]{\def\def@pt{\%}\def\pas@pt{#1}',
    r'  \mbox{\ifx\def@pt\pas@pt\cite@rig{#2}\else\cite@rig[#1]{#2}\fi}}',
    r'\renewcommand{\underbar}[1]{{\let\cite\b@xcite\uline{#1}}}']

def convert_ulinelatex(document):
    " Remove preamble code for \\uline font attribute. "
    del_complete_lines(document.preamble,
                       ['% Added by lyx2lyx']+ulinelatex_preamble)

def revert_ulinelatex(document):
    " Add preamble code for \\uline font attribute in citations. "
    i = find_token(document.body, '\\bar under', 0)
    if i == -1:
        return
    try:
        document.preamble.index(r'\usepackage{ulem}')
    except ValueError:
        insert_to_preamble(document, strikeout_preamble)
    insert_to_preamble(document, ulinelatex_preamble)


def revert_custom_processors(document):
    " Remove bibtex_command and index_command params "

    if not del_token(document.header, '\\bibtex_command', 0):
        document.warning("Malformed LyX document: Missing \\bibtex_command.")

    if not del_token(document.header, '\\index_command', 0):
        document.warning("Malformed LyX document: Missing \\index_command.")


def convert_nomencl_width(document):
    " Add set_width param to nomencl_print "
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset CommandInset nomencl_print", i)
      if i == -1:
        break
      document.body.insert(i + 2, "set_width \"none\"")
      i = i + 1


def revert_nomencl_width(document):
    " Remove set_width param from nomencl_print "
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset CommandInset nomencl_print", i)
      if i == -1:
        break
      j = find_end_of_inset(document.body, i)
      if not del_token(document.body, "set_width", i, j):
        document.warning("Can't find set_width option for nomencl_print!")
      i = j


def revert_nomencl_cwidth(document):
    " Remove width param from nomencl_print "
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset CommandInset nomencl_print", i)
      if i == -1:
        break
      j = find_end_of_inset(document.body, i)
      l = find_token(document.body, "width", i, j)
      if l == -1:
        i = j
        continue
      width = get_quoted_value(document.body, "width", i, j)
      del document.body[l]
      insert_to_preamble(document, ["\\setlength{\\nomlabelwidth}{" + width + "}"])
      i = j - 1


def revert_applemac(document):
    " Revert applemac encoding to auto "
    if document.encoding != "applemac":
      return
    document.encoding = "auto"
    i = find_token(document.header, "\\encoding", 0)
    if i != -1:
        document.header[i] = "\\encoding auto"


def revert_longtable_align(document):
    " Remove longtable alignment setting "
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset Tabular", i)
      if i == -1:
          break
      end = find_end_of_inset(document.body, i)
      if end == -1:
          document.warning("Can't find end of inset at line " + str(i))
          i += 1
          continue
      fline = find_token(document.body, "<features", i, end)
      if fline == -1:
          document.warning("Can't find features for inset at line " + str(i))
          i += 1
          continue
      j = document.body[fline].find("longtabularalignment")
      if j == -1:
          i += 1
          continue
      # FIXME Is this correct? It wipes out everything after the
      # one we found.
      document.body[fline] = document.body[fline][:j - 1] + '>'
      # since there could be a tabular inside this one, we
      # cannot jump to end.
      i += 1


def revert_branch_filename(document):
    " Remove \\filename_suffix parameter from branches "
    i = 0
    while True:
        i = find_token(document.header, "\\filename_suffix", i)
        if i == -1:
            return
        del document.header[i]


def revert_paragraph_indentation(document):
    " Revert custom paragraph indentation to preamble code "
    i = find_token(document.header, "\\paragraph_indentation", 0)
    if i == -1:
      return
    length = get_value(document.header, "\\paragraph_indentation", i)
    # we need only remove the line if indentation is default
    if length != "default":
      # handle percent lengths
      length = latex_length(length)[1]
      insert_to_preamble(document, ["\\setlength{\\parindent}{" + length + "}"])
    del document.header[i]


def revert_percent_skip_lengths(document):
    " Revert relative lengths for paragraph skip separation to preamble code "
    i = find_token(document.header, "\\defskip", 0)
    if i == -1:
        return
    length = get_value(document.header, "\\defskip", i)
    # only revert when a custom length was set and when
    # it used a percent length
    if length in ('smallskip', 'medskip', 'bigskip'):
        return
    # handle percent lengths
    percent, length = latex_length(length)
    if percent:
        insert_to_preamble(document, ["\\setlength{\\parskip}{" + length + "}"])
        # set defskip to medskip as default
        document.header[i] = "\\defskip medskip"


def revert_percent_vspace_lengths(document):
    " Revert relative VSpace lengths to ERT "
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset VSpace", i)
      if i == -1:
          break
      # only revert if a custom length was set and if
      # it used a percent length
      r = re.compile(r'\\begin_inset VSpace (.*)$')
      m = r.match(document.body[i])
      length = m.group(1)
      if length in ('defskip', 'smallskip', 'medskip', 'bigskip', 'vfill'):
         i += 1
         continue
      # check if the space has a star (protected space)
      protected = (document.body[i].rfind("*") != -1)
      if protected:
          length = length.rstrip('*')
      # handle percent lengths
      percent, length = latex_length(length)
      # revert the VSpace inset to ERT
      if percent:
          if protected:
              subst = put_cmd_in_ert("\\vspace*{" + length + "}")
          else:
              subst = put_cmd_in_ert("\\vspace{" + length + "}")
          document.body[i:i + 2] = subst
      i += 1


def revert_percent_hspace_lengths(document):
    " Revert relative HSpace lengths to ERT "
    i = 0
    while True:
      i = find_token_exact(document.body, "\\begin_inset space \\hspace", 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 " + str(i))
          i += 1
          continue
      # only revert if a custom length was set...
      length = get_value(document.body, '\\length', i + 1, j)
      if length == '':
          document.warning("Malformed lyx document: Missing '\\length' in Space inset.")
          i = j
          continue
      protected = ""
      if document.body[i].find("\\hspace*{}") != -1:
          protected = "*"
      # ...and if it used a percent length
      percent, length = latex_length(length)
      # revert the HSpace inset to ERT
      if percent:
          subst = put_cmd_in_ert("\\hspace" + protected + "{" + length + "}")
          document.body[i:j + 1] = subst
      # if we did a substitution, this will still be ok
      i = j


def revert_hspace_glue_lengths(document):
    " Revert HSpace glue lengths to ERT "
    i = 0
    while True:
      i = find_token_exact(document.body, "\\begin_inset space \\hspace", 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 " + str(i))
          i += 1
          continue
      length = get_value(document.body, '\\length', i + 1, j)
      if length == '':
          document.warning("Malformed lyx document: Missing '\\length' in Space inset.")
          i = j
          continue
      protected = ""
      if document.body[i].find("\\hspace*{}") != -1:
          protected = "*"
      # only revert if the length contains a plus or minus at pos != 0
      if length.find('-',1) != -1 or length.find('+',1) != -1:
          # handle percent lengths
          length = latex_length(length)[1]
          # revert the HSpace inset to ERT
          subst = put_cmd_in_ert("\\hspace" + protected + "{" + length + "}")
          document.body[i:j+1] = subst
      i = j


def convert_author_id(document):
    " Add the author_id to the \\author definition and make sure 0 is not used"
    i = 0
    anum = 1
    re_author = re.compile(r'(\\author) (\".*\")\s*(.*)$')

    while True:
        i = find_token(document.header, "\\author", i)
        if i == -1:
            break
        m = re_author.match(document.header[i])
        if m:
            name = m.group(2)
            email = m.group(3)
            document.header[i] = "\\author %i %s %s" % (anum, name, email)
        anum += 1
        i += 1

    i = 0
    while True:
        i = find_token(document.body, "\\change_", i)
        if i == -1:
            break
        change = document.body[i].split(' ');
        if len(change) == 3:
            type = change[0]
            author_id = int(change[1])
            time = change[2]
            document.body[i] = "%s %i %s" % (type, author_id + 1, time)
        i += 1


def revert_author_id(document):
    " Remove the author_id from the \\author definition "
    i = 0
    anum = 0
    rx = re.compile(r'(\\author)\s+(-?\d+)\s+(\".*\")\s*(.*)$')
    idmap = dict()

    while True:
        i = find_token(document.header, "\\author", i)
        if i == -1:
            break
        m = rx.match(document.header[i])
        if m:
            author_id = int(m.group(2))
            idmap[author_id] = anum
            name = m.group(3)
            email = m.group(4)
            document.header[i] = "\\author %s %s" % (name, email)
        i += 1
        # FIXME Should this be incremented if we didn't match?
        anum += 1

    i = 0
    while True:
        i = find_token(document.body, "\\change_", i)
        if i == -1:
            break
        change = document.body[i].split(' ');
        if len(change) == 3:
            type = change[0]
            author_id = int(change[1])
            time = change[2]
            document.body[i] = "%s %i %s" % (type, idmap[author_id], time)
        i += 1


def revert_suppress_date(document):
    " Revert suppressing of default document date to preamble code "
    i = find_token(document.header, "\\suppress_date", 0)
    if i == -1:
        return
    # remove the preamble line and write to the preamble
    # when suppress_date was true
    date = str2bool(get_value(document.header, "\\suppress_date", i))
    if date:
        add_to_preamble(document, ["\\date{}"])
    del document.header[i]


mhchem_preamble = [r"\PassOptionsToPackage{version=3}{mhchem}",
                   r"\usepackage{mhchem}"]

def convert_mhchem(document):
    "Set mhchem to off for versions older than 1.6.x"
    if document.initial_format < 277:
        # LyX 1.5.x and older did never load mhchem.
        # Therefore we must switch it off: Documents that use mhchem have
        # a manual \usepackage anyway, and documents not using mhchem but
        # custom macros with the same names as mhchem commands might get
        # corrupted if mhchem is automatically loaded.
        mhchem = 0 # off
    else:
        # LyX 1.6.x did always load mhchem automatically.
        mhchem = 1 # auto
    i = find_token(document.header, "\\use_esint", 0)
    if i == -1:
        # pre-1.5.x document
        i = find_token(document.header, "\\use_amsmath", 0)
    if i == -1:
        document.warning("Malformed LyX document: "
                         "Could not find amsmath or esint setting.")
        return
    document.header.insert(i + 1, "\\use_mhchem %d" % mhchem)
    # remove LyX-inserted preamble 
    if mhchem != 0:
        del_complete_lines(document.preamble,
                           ['% Added by lyx2lyx']+mhchem_preamble)


def revert_mhchem(document):
    "Revert mhchem loading to preamble code."

    mhchem = get_value(document.header, "\\use_mhchem", delete=True)
    try:
        mhchem = int(mhchem)
    except ValueError:
        document.warning("Malformed LyX document: "
                         "Could not find mhchem setting.")
        mhchem = 1 # "auto"
    # mhchem in {0: "off", 1: "auto", 2: "on"}

    if mhchem == 1: # "auto"
        i = 0
        while i != 1 and mhchem == 1:
            i = find_token(document.body, "\\begin_inset Formula", i)
            j = find_end_of_inset(document.body, i)
            if j == -1:
                break
            if (True for line in document.body[i:j]
                if r"\ce{" in line or r"\cf{" in line):
                mhchem = 2
                break
            i += 1

    if (mhchem == 2 # on
        and find_token(document.preamble, r"\usepackage{mhchem}") == -1):
        insert_to_preamble(document, mhchem_preamble)


def revert_fontenc(document):
    " Remove fontencoding param "
    if not del_token(document.header, '\\fontencoding', 0):
        document.warning("Malformed LyX document: Missing \\fontencoding.")


def merge_gbrief(document):
    " Merge g-brief-en and g-brief-de to one class "

    if document.textclass != "g-brief-de":
        if document.textclass == "g-brief-en":
            document.textclass = "g-brief"
            document.set_textclass()
        return

    obsoletedby = { "Brieftext":       "Letter",
                    "Unterschrift":    "Signature",
                    "Strasse":         "Street",
                    "Zusatz":          "Addition",
                    "Ort":             "Town",
                    "Land":            "State",
                    "RetourAdresse":   "ReturnAddress",
                    "MeinZeichen":     "MyRef",
                    "IhrZeichen":      "YourRef",
                    "IhrSchreiben":    "YourMail",
                    "Telefon":         "Phone",
                    "BLZ":             "BankCode",
                    "Konto":           "BankAccount",
                    "Postvermerk":     "PostalComment",
                    "Adresse":         "Address",
                    "Datum":           "Date",
                    "Betreff":         "Reference",
                    "Anrede":          "Opening",
                    "Anlagen":         "Encl.",
                    "Verteiler":       "cc",
                    "Gruss":           "Closing"}
    i = 0
    while True:
        i = find_token(document.body, "\\begin_layout", i)
        if i == -1:
            break

        layout = document.body[i][14:]
        if layout in obsoletedby:
            document.body[i] = "\\begin_layout " + obsoletedby[layout]

        i += 1

    document.textclass = "g-brief"
    document.set_textclass()


def revert_gbrief(document):
    " Revert g-brief to g-brief-en "
    if document.textclass == "g-brief":
        document.textclass = "g-brief-en"
        document.set_textclass()


def revert_html_options(document):
    " Remove html options "
    del_token(document.header, '\\html_use_mathml', 0)
    del_token(document.header, '\\html_be_strict', 0)


def revert_includeonly(document):
    i = 0
    while True:
        i = find_token(document.header, "\\begin_includeonly", i)
        if i == -1:
            return
        j = find_end_of(document.header, i, "\\begin_includeonly", "\\end_includeonly")
        if j == -1:
            document.warning("Unable to find end of includeonly section!!")
            break
        document.header[i : j + 1] = []


def convert_includeall(document):
    " Add maintain_unincluded_children param "

    i = 0
    i = find_token(document.header, "\\maintain_unincluded_children", 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, "\\maintain_unincluded_children false")
        return


def revert_includeall(document):
    " Remove maintain_unincluded_children param "
    del_token(document.header, '\\maintain_unincluded_children', 0)


def revert_multirow(document):
    " Revert multirow cells in tables to TeX-code"

    # first, let's find out if we need to do anything
    # cell type 3 is multirow begin cell
    i = find_token(document.body, '<cell multirow="3"', 0)
    if i == -1:
      return

    add_to_preamble(document, ["\\usepackage{multirow}"])

    begin_table = 0
    while True:
        # find begin/end of table
        begin_table = find_token(document.body, '<lyxtabular version=', begin_table)
        if begin_table == -1:
            break
        end_table = find_end_of(document.body, begin_table, '<lyxtabular', '</lyxtabular>')
        if end_table == -1:
            document.warning("Malformed LyX document: Could not find end of table.")
            begin_table += 1
            continue
        # does this table have multirow?
        i = find_token(document.body, '<cell multirow="3"', begin_table, end_table)
        if i == -1:
            begin_table = end_table
            continue

        # store the number of rows and columns
        numrows = get_option_value(document.body[begin_table], "rows")
        numcols = get_option_value(document.body[begin_table], "columns")
        try:
          numrows = int(numrows)
          numcols = int(numcols)
        except:
          document.warning("Unable to determine rows and columns!")
          begin_table = end_table
          continue

        mrstarts = []
        multirows = []
        # collect info on rows and columns of this table.
        begin_row = begin_table
        for row in range(numrows):
            begin_row = find_token(document.body, '<row>', begin_row, end_table)
            if begin_row == -1:
              document.warning("Can't find row " + str(row + 1))
              break
            end_row = find_end_of(document.body, begin_row, '<row>', '</row>')
            if end_row == -1:
              document.warning("Can't find end of row " + str(row + 1))
              break
            begin_cell = begin_row
            multirows.append([])
            for column in range(numcols):
                begin_cell = find_token(document.body, '<cell ', begin_cell, end_row)
                if begin_cell == -1:
                  document.warning("Can't find column " + str(column + 1) + \
                    "in row " + str(row + 1))
                  break
                # NOTE
                # this will fail if someone puts "</cell>" in a cell, but
                # that seems fairly unlikely.
                end_cell = find_end_of(document.body, begin_cell, '<cell', '</cell>')
                if end_cell == -1:
                  document.warning("Can't find end of column " + str(column + 1) + \
                    "in row " + str(row + 1))
                  break
                multirows[row].append([begin_cell, end_cell, 0])
                if document.body[begin_cell].find('multirow="3"') != -1:
                  multirows[row][column][2] = 3 # begin multirow
                  mrstarts.append([row, column])
                elif document.body[begin_cell].find('multirow="4"') != -1:
                  multirows[row][column][2] = 4 # in multirow
                begin_cell = end_cell
            begin_row = end_row
        # end of table info collection

        # work from the back to avoid messing up numbering
        mrstarts.reverse()
        for m in mrstarts:
            row = m[0]
            col = m[1]
            # get column width
            col_width = get_option_value(document.body[begin_table + 2 + col], "width")
            # "0pt" means that no width is specified
            if not col_width or col_width == "0pt":
              col_width = "*"
            # determine the number of cells that are part of the multirow
            nummrs = 1
            for r in range(row + 1, numrows):
                if multirows[r][col][2] != 4:
                  break
                nummrs += 1
                # take the opportunity to revert this line
                lineno = multirows[r][col][0]
                document.body[lineno] = document.body[lineno].\
                  replace(' multirow="4" ', ' ').\
                  replace('valignment="middle"', 'valignment="top"').\
                  replace(' topline="true" ', ' ')
                # remove bottom line of previous multirow-part cell
                lineno = multirows[r-1][col][0]
                document.body[lineno] = document.body[lineno].replace(' bottomline="true" ', ' ')
            # revert beginning cell
            bcell = multirows[row][col][0]
            ecell = multirows[row][col][1]
            document.body[bcell] = document.body[bcell].\
              replace(' multirow="3" ', ' ').\
              replace('valignment="middle"', 'valignment="top"')
            blay = find_token(document.body, "\\begin_layout", bcell, ecell)
            if blay == -1:
              document.warning("Can't find layout for cell!")
              continue
            bend = find_end_of_layout(document.body, blay)
            if bend == -1:
              document.warning("Can't find end of layout for cell!")
              continue
            # do the later one first, so as not to mess up the numbering
            # we are wrapping the whole cell in this ert
            # so before the end of the layout...
            document.body[bend:bend] = put_cmd_in_ert("}")
            # ...and after the beginning
            document.body[blay + 1:blay + 1] = \
              put_cmd_in_ert("\\multirow{" + str(nummrs) + "}{" + col_width + "}{")

        begin_table = end_table


def convert_math_output(document):
    r" Convert \html_use_mathml to \html_math_output "
    i = find_token(document.header, "\\html_use_mathml", 0)
    if i == -1:
        return
    rgx = re.compile(r'\\html_use_mathml\s+(\w+)')
    m = rgx.match(document.header[i])
    newval = "0" # MathML
    if m:
      val = str2bool(m.group(1))
      if not val:
        newval = "2" # Images
    else:
      document.warning("Can't match " + document.header[i])
    document.header[i] = "\\html_math_output " + newval


def revert_math_output(document):
    r" Revert \html_math_output to \html_use_mathml "
    i = find_token(document.header, "\\html_math_output", 0)
    if i == -1:
        return
    rgx = re.compile(r'\\html_math_output\s+(\d)')
    m = rgx.match(document.header[i])
    newval = "true"
    if m:
        val = m.group(1)
        if val == "1" or val == "2":
            newval = "false"
    else:
        document.warning("Unable to match " + document.header[i])
    document.header[i] = "\\html_use_mathml " + newval



def revert_inset_preview(document):
    " Dissolves the preview inset "
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset Preview", i)
      if i == -1:
          return
      iend = find_end_of_inset(document.body, i)
      if iend == -1:
          document.warning("Malformed LyX document: Could not find end of Preview inset.")
          i += 1
          continue

      # This has several issues.
      # We need to do something about the layouts inside InsetPreview.
      # If we just leave the first one, then we have something like:
      # \begin_layout Standard
      # ...
      # \begin_layout Standard
      # and we get a "no \end_layout" error. So something has to be done.
      # Ideally, we would check if it is the same as the layout we are in.
      # If so, we just remove it; if not, we end the active one. But it is
      # not easy to know what layout we are in, due to depth changes, etc,
      # and it is not clear to me how much work it is worth doing. In most
      # cases, the layout will probably be the same.
      #
      # For the same reason, we have to remove the \end_layout tag at the
      # end of the last layout in the inset. Again, that will sometimes be
      # wrong, but it will usually be right. To know what to do, we would
      # again have to know what layout the inset is in.

      blay = find_token(document.body, "\\begin_layout", i, iend)
      if blay == -1:
          document.warning("Can't find layout for preview inset!")
          # always do the later one first...
          del document.body[iend]
          del document.body[i]
          # deletions mean we do not need to reset i
          continue

      # This is where we would check what layout we are in.
      # The check for Standard is definitely wrong.
      #
      # lay = document.body[blay].split(None, 1)[1]
      # if lay != oldlayout:
      #     # record a boolean to tell us what to do later....
      #     # better to do it later, since (a) it won't mess up
      #     # the numbering and (b) we only modify at the end.

      # we want to delete the last \\end_layout in this inset, too.
      # note that this may not be the \\end_layout that goes with blay!!
      bend = find_end_of_layout(document.body, blay)
      while True:
          tmp = find_token(document.body, "\\end_layout", bend + 1, iend)
          if tmp == -1:
              break
          bend = tmp
      if bend == blay:
          document.warning("Unable to find last layout in preview inset!")
          del document.body[iend]
          del document.body[i]
          # deletions mean we do not need to reset i
          continue
      # always do the later one first...
      del document.body[iend]
      del document.body[bend]
      del document.body[i:blay + 1]
      # we do not need to reset i


def revert_equalspacing_xymatrix(document):
    " Revert a Formula with xymatrix@! to an ERT inset "
    i = 0
    has_preamble = False
    has_equal_spacing = False

    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("Malformed LyX document: Could not find end of Formula inset.")
          i += 1
          continue

      for curline in range(i,j):
          found = document.body[curline].find("\\xymatrix@!")
          if found != -1:
              break

      if found != -1:
          has_equal_spacing = True
          content = [document.body[i][21:]]
          content += document.body[i + 1:j]
          subst = put_cmd_in_ert(content)
          document.body[i:j + 1] = subst
          i += len(subst) - (j - i) + 1
      else:
          for curline in range(i,j):
              l = document.body[curline].find("\\xymatrix")
              if l != -1:
                  has_preamble = True;
                  break;
          i = j + 1

    if has_equal_spacing and not has_preamble:
        add_to_preamble(document, ['\\usepackage[all]{xy}'])


def revert_notefontcolor(document):
    " Reverts greyed-out note font color to preamble code "

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

    colorcode = get_value(document.header, '\\notefontcolor', i)
    del document.header[i]

    # are there any grey notes?
    if find_token(document.body, "\\begin_inset Note Greyedout", 0) == -1:
        # no need to do anything else, and \renewcommand will throw
        # an error since lyxgreyedout will not exist.
        return

    # the color code is in the form #rrggbb where every character denotes a hex number
    red = hex2ratio(colorcode[1:3])
    green = hex2ratio(colorcode[3:5])
    blue = hex2ratio(colorcode[5:7])
    # write the preamble
    insert_to_preamble(document,
      [ '%  for greyed-out notes',
        '\\@ifundefined{definecolor}{\\usepackage{color}}{}'
        '\\definecolor{note_fontcolor}{rgb}{%s,%s,%s}' % (red, green, blue),
        '\\renewenvironment{lyxgreyedout}',
        ' {\\textcolor{note_fontcolor}\\bgroup}{\\egroup}'])


def revert_turkmen(document):
    "Set language Turkmen to English"

    revert_language(document, "turkmen", "turkmen", "turkmen")


def revert_fontcolor(document):
    " Reverts font color to preamble code "
    i = find_token(document.header, "\\fontcolor", 0)
    if i == -1:
        return
    colorcode = get_value(document.header, '\\fontcolor', i)
    del document.header[i]
    # don't clutter the preamble if font color is not set
    if colorcode == "#000000":
        return
    # the color code is in the form #rrggbb where every character denotes a hex number
    red = hex2ratio(colorcode[1:3])
    green = hex2ratio(colorcode[3:5])
    blue = hex2ratio(colorcode[5:7])
    # write the preamble
    insert_to_preamble(document,
      ['%  Set the font color',
      '\\@ifundefined{definecolor}{\\usepackage{color}}{}',
      '\\definecolor{document_fontcolor}{rgb}{%s,%s,%s}' % (red, green, blue),
      '\\color{document_fontcolor}'])


def revert_shadedboxcolor(document):
    " Reverts shaded box color to preamble code "
    i = find_token(document.header, "\\boxbgcolor", 0)
    if i == -1:
        return
    colorcode = get_value(document.header, '\\boxbgcolor', i)
    del document.header[i]
    # the color code is in the form #rrggbb
    red = hex2ratio(colorcode[1:3])
    green = hex2ratio(colorcode[3:5])
    blue = hex2ratio(colorcode[5:7])
    # write the preamble
    insert_to_preamble(document,
      ['%  Set the color of boxes with shaded background',
      '\\@ifundefined{definecolor}{\\usepackage{color}}{}',
      "\\definecolor{shadecolor}{rgb}{%s,%s,%s}" % (red, green, blue)])


def revert_lyx_version(document):
    " Reverts LyX Version information from Inset Info "
    version = "LyX version"
    try:
        import lyx2lyx_version
        version = lyx2lyx_version.version
    except:
        pass

    i = 0
    while True:
        i = find_token(document.body, '\\begin_inset Info', i)
        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.")
            i += 1
            continue

        # We expect:
        # \begin_inset Info
        # type  "lyxinfo"
        # arg   "version"
        # \end_inset
        typ = get_quoted_value(document.body, "type", i, j)
        arg = get_quoted_value(document.body, "arg", i, j)
        if arg != "version" or typ != "lyxinfo":
            i = j + 1
            continue

        # We do not actually know the version of LyX used to produce the document.
        # But we can use our version, since we are reverting.
        s = [version]
        # Now we want to check if the line after "\end_inset" is empty. It normally
        # is, so we want to remove it, too.
        lastline = j + 1
        if document.body[j + 1].strip() == "":
            lastline = j + 2
        document.body[i: lastline] = s
        i = i + 1


def revert_math_scale(document):
  " Remove math scaling and LaTeX options "
  del_token(document.header, '\\html_math_img_scale', 0)
  del_token(document.header, '\\html_latex_start', 0)
  del_token(document.header, '\\html_latex_end', 0)


def revert_pagesizes(document):
  " Revert page sizes to default "
  i = find_token(document.header, '\\papersize', 0)
  if i != -1:
    size = document.header[i][11:]
    if size == "a0paper" or size == "a1paper" or size == "a2paper" \
    or size == "a6paper" or size == "b0paper" or size == "b1paper" \
    or size == "b2paper" or size == "b6paper" or size == "b0j" \
    or size == "b1j" or size == "b2j" or size == "b3j" or size == "b4j" \
    or size == "b5j" or size == "b6j":
      del document.header[i]


def revert_DIN_C_pagesizes(document):
  " Revert DIN C page sizes to default "
  i = find_token(document.header, '\\papersize', 0)
  if i != -1:
    size = document.header[i][11:]
    if size == "c0paper" or size == "c1paper" or size == "c2paper" \
    or size == "c3paper" or size == "c4paper" or size == "c5paper" \
    or size == "c6paper":
      del document.header[i]


def convert_html_quotes(document):
  " Remove quotes around html_latex_start and html_latex_end "

  i = find_token(document.header, '\\html_latex_start', 0)
  if i != -1:
    line = document.header[i]
    l = re.compile(r'\\html_latex_start\s+"(.*)"')
    m = l.match(line)
    if m:
      document.header[i] = "\\html_latex_start " + m.group(1)

  i = find_token(document.header, '\\html_latex_end', 0)
  if i != -1:
    line = document.header[i]
    l = re.compile(r'\\html_latex_end\s+"(.*)"')
    m = l.match(line)
    if m:
      document.header[i] = "\\html_latex_end " + m.group(1)


def revert_html_quotes(document):
  " Remove quotes around html_latex_start and html_latex_end "

  i = find_token(document.header, '\\html_latex_start', 0)
  if i != -1:
    line = document.header[i]
    l = re.compile(r'\\html_latex_start\s+(.*)')
    m = l.match(line)
    if not m:
        document.warning("Weird html_latex_start line: " + line)
        del document.header[i]
    else:
        document.header[i] = "\\html_latex_start \"" + m.group(1) + "\""

  i = find_token(document.header, '\\html_latex_end', 0)
  if i != -1:
    line = document.header[i]
    l = re.compile(r'\\html_latex_end\s+(.*)')
    m = l.match(line)
    if not m:
        document.warning("Weird html_latex_end line: " + line)
        del document.header[i]
    else:
        document.header[i] = "\\html_latex_end \"" + m.group(1) + "\""


def revert_output_sync(document):
  " Remove forward search options "
  del_token(document.header, '\\output_sync_macro', 0)
  del_token(document.header, '\\output_sync', 0)


def revert_align_decimal(document):
  i = 0
  while True:
    i = find_token(document.body, "\\begin_inset Tabular", i)
    if i == -1:
      return
    j = find_end_of_inset(document.body, i)
    if j == -1:
      document.warning("Unable to find end of Tabular inset at line " + str(i))
      i += 1
      continue
    cell = find_token(document.body, "<cell", i, j)
    if cell == -1:
      document.warning("Can't find any cells in Tabular inset at line " + str(i))
      i = j
      continue
    k = i + 1
    while True:
      k = find_token(document.body, "<column", k, cell)
      if k == -1:
        return
      if document.body[k].find('alignment="decimal"') == -1:
        k += 1
        continue
      remove_option(document.body, k, 'decimal_point')
      document.body[k] = \
        document.body[k].replace('alignment="decimal"', 'alignment="center"')
      k += 1


def convert_optarg(document):
  " Convert \\begin_inset OptArg to \\begin_inset Argument "
  i = 0
  while True:
    i = find_token(document.body, '\\begin_inset OptArg', i)
    if i == -1:
      return
    document.body[i] = "\\begin_inset Argument"
    i += 1


def revert_argument(document):
  " Convert \\begin_inset Argument to \\begin_inset OptArg "
  i = 0
  while True:
    i = find_token(document.body, '\\begin_inset Argument', i)
    if i == -1:
      return
    document.body[i] = "\\begin_inset OptArg"
    i += 1


def revert_makebox(document):
  " Convert \\makebox to TeX code "
  i = 0
  while True:
    i = find_token(document.body, '\\begin_inset Box', i)
    if i == -1:
      break
    z = find_end_of_inset(document.body, i)
    if z == -1:
      document.warning("Malformed LyX document: Can't find end of box inset.")
      i += 1
      continue
    blay = find_token(document.body, "\\begin_layout", i, z)
    if blay == -1:
      document.warning("Malformed LyX document: Can't find layout in box.")
      i = z
      continue
    j = find_token(document.body, 'use_makebox', i)
    if j == -1 or j != i +6:
      document.warning("Malformed LyX document: Can't find use_makebox statement in box.")
      i = z
      continue
    # delete use_makebox
    if not check_token(document.body[i], "\\begin_inset Box Frameless") \
      or get_value(document.body, 'use_makebox', j) != 1:
        del document.body[j]
        i += 1
        continue
    bend = find_end_of_layout(document.body, blay)
    if bend == -1 or bend > z:
        document.warning("Malformed LyX document: Can't find end of layout in box.")
        i = z
        continue
    # determine the alignment
    align = get_quoted_value(document.body, 'hor_pos', i, blay, "c")
    # determine the width
    length = get_quoted_value(document.body, 'width', i, blay, "50col%")
    length = latex_length(length)[1]
    # remove the \end_layout \end_inset pair
    document.body[bend:z + 1] = put_cmd_in_ert("}")
    subst = "\\makebox[" + length + "][" \
      + align + "]{"
    document.body[i:blay + 1] = put_cmd_in_ert(subst)
    i += 1


def convert_use_makebox(document):
  " Adds use_makebox option for boxes "
  i = 0
  while True:
    i = find_token(document.body, '\\begin_inset Box', i)
    if i == -1:
      return
    k = find_token(document.body, 'use_parbox', i)
    if k == -1 or k != i + 5:
      document.warning("Malformed LyX document: Can't find use_parbox statement in box.")
      i += 1
      continue
    if k == i + 5:
      document.body.insert(k + 1, "use_makebox 0")
    i += 1


def revert_IEEEtran(document):
  " Convert IEEEtran layouts and styles to TeX code "

  if document.textclass != "IEEEtran":
    return

  revert_flex_inset(document.body, "IEEE membership", "\\IEEEmembership")
  revert_flex_inset(document.body, "Lowercase", "\\MakeLowercase")

  layouts = ("Special Paper Notice", "After Title Text", "Publication ID",
             "Page headings", "Biography without photo")
  latexcmd = {"Special Paper Notice": "\\IEEEspecialpapernotice",
              "After Title Text":     "\\IEEEaftertitletext",
              "Publication ID":       "\\IEEEpubid"}
  obsoletedby = {"Page headings":            "MarkBoth",
                 "Biography without photo":  "BiographyNoPhoto"}

  for layout in layouts:
    i = 0
    while True:
        i = find_token(document.body, '\\begin_layout ' + layout, i)
        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 " + layout + " layout.")
          i += 1
          continue
        if layout in list(obsoletedby.keys()):
          document.body[i] = "\\begin_layout " + obsoletedby[layout]
          i = j
          continue
        content = lyx2latex(document, document.body[i:j + 1])
        add_to_preamble(document, [latexcmd[layout] + "{" + content + "}"])
        del document.body[i:j + 1]
        # no need to reset i


def convert_prettyref(document):
	" Converts prettyref references to neutral formatted refs "
	re_ref = re.compile("^\\s*reference\\s+\"(\\w+):(\\S+)\"")
	nm_ref = re.compile("^\\s*name\\s+\"(\\w+):(\\S+)\"")

	i = 0
	while True:
		i = find_token(document.body, "\\begin_inset CommandInset ref", i)
		if i == -1:
			break
		j = find_end_of_inset(document.body, i)
		if j == -1:
			document.warning("Malformed LyX document: No end of InsetRef!")
			i += 1
			continue
		k = find_token(document.body, "LatexCommand prettyref", i, j)
		if k != -1:
			document.body[k] = "LatexCommand formatted"
		i = j + 1
	document.header.insert(-1, "\\use_refstyle 0")


def revert_refstyle(document):
	" Reverts neutral formatted refs to prettyref "
	re_ref = re.compile("^reference\\s+\"(\\w+):(\\S+)\"")
	nm_ref = re.compile("^\\s*name\\s+\"(\\w+):(\\S+)\"")

	i = 0
	while True:
		i = find_token(document.body, "\\begin_inset CommandInset ref", i)
		if i == -1:
			break
		j = find_end_of_inset(document.body, i)
		if j == -1:
			document.warning("Malformed LyX document: No end of InsetRef")
			i += 1
			continue
		k = find_token(document.body, "LatexCommand formatted", i, j)
		if k != -1:
			document.body[k] = "LatexCommand prettyref"
		i = j + 1
	i = find_token(document.header, "\\use_refstyle", 0)
	if i != -1:
		document.header.pop(i)


def revert_nameref(document):
  " Convert namerefs to regular references "
  cmds = ["Nameref", "nameref"]
  foundone = False
  rx = re.compile(r'reference "(.*)"')
  for cmd in cmds:
    i = 0
    oldcmd = "LatexCommand " + cmd
    while True:
      # It seems better to look for this, as most of the reference
      # insets won't be ones we care about.
      i = find_token(document.body, oldcmd, i)
      if i == -1:
        break
      cmdloc = i
      i += 1
      # Make sure it is actually in an inset!
      # A normal line could begin with "LatexCommand nameref"!
      stins, endins = is_in_inset(document.body, cmdloc,
                                  "\\begin_inset CommandInset ref")
      if endins == -1:
          continue
      # ok, so it is in an InsetRef
      refline = find_token(document.body, "reference", stins, endins)
      if refline == -1:
        document.warning("Can't find reference for inset at line " + stinst + "!!")
        continue
      m = rx.match(document.body[refline])
      if not m:
        document.warning("Can't match reference line: " + document.body[ref])
        continue
      foundone = True
      ref = m.group(1)
      newcontent = put_cmd_in_ert('\\' + cmd + '{' + ref + '}')
      document.body[stins:endins + 1] = newcontent

  if foundone:
    add_to_preamble(document, ["\\usepackage{nameref}"])


def remove_Nameref(document):
  " Convert Nameref commands to nameref commands "
  i = 0
  while True:
    # It seems better to look for this, as most of the reference
    # insets won't be ones we care about.
    i = find_token(document.body, "LatexCommand Nameref" , i)
    if i == -1:
      break
    cmdloc = i
    i += 1
    # Make sure it is actually in an inset!
    val = is_in_inset(document.body, cmdloc,
                      "\\begin_inset CommandInset ref", default=False)
    if not val:
      continue
    document.body[cmdloc] = "LatexCommand nameref"


def revert_mathrsfs(document):
    r" Load mathrsfs if \mathrsfs us use in the document "
    i = 0
    for line in document.body:
      if line.find("\\mathscr{") != -1:
        add_to_preamble(document, ["\\usepackage{mathrsfs}"])
        return


def convert_flexnames(document):
    "Convert \\begin_inset Flex Custom:Style to \\begin_inset Flex Style and similarly for CharStyle and Element."

    i = 0
    rx = re.compile(r'^\\begin_inset Flex (?:Custom|CharStyle|Element):(.+)$')
    while True:
      i = find_token(document.body, "\\begin_inset Flex", i)
      if i == -1:
        return
      m = rx.match(document.body[i])
      if m:
        document.body[i] = "\\begin_inset Flex " + m.group(1)
      i += 1


flex_insets = {
  "Alert" : "CharStyle:Alert",
  "Code" : "CharStyle:Code",
  "Concepts" : "CharStyle:Concepts",
  "E-Mail" : "CharStyle:E-Mail",
  "Emph" : "CharStyle:Emph",
  "Expression" : "CharStyle:Expression",
  "Initial" : "CharStyle:Initial",
  "Institute" : "CharStyle:Institute",
  "Meaning" : "CharStyle:Meaning",
  "Noun" : "CharStyle:Noun",
  "Strong" : "CharStyle:Strong",
  "Structure" : "CharStyle:Structure",
  "ArticleMode" : "Custom:ArticleMode",
  "Endnote" : "Custom:Endnote",
  "Glosse" : "Custom:Glosse",
  "PresentationMode" : "Custom:PresentationMode",
  "Tri-Glosse" : "Custom:Tri-Glosse"
}

flex_elements = {
  "Abbrev" : "Element:Abbrev",
  "CCC-Code" : "Element:CCC-Code",
  "Citation-number" : "Element:Citation-number",
  "City" : "Element:City",
  "Code" : "Element:Code",
  "CODEN" : "Element:CODEN",
  "Country" : "Element:Country",
  "Day" : "Element:Day",
  "Directory" : "Element:Directory",
  "Dscr" : "Element:Dscr",
  "Email" : "Element:Email",
  "Emph" : "Element:Emph",
  "Filename" : "Element:Filename",
  "Firstname" : "Element:Firstname",
  "Fname" : "Element:Fname",
  "GuiButton" : "Element:GuiButton",
  "GuiMenu" : "Element:GuiMenu",
  "GuiMenuItem" : "Element:GuiMenuItem",
  "ISSN" : "Element:ISSN",
  "Issue-day" : "Element:Issue-day",
  "Issue-months" : "Element:Issue-months",
  "Issue-number" : "Element:Issue-number",
  "KeyCap" : "Element:KeyCap",
  "KeyCombo" : "Element:KeyCombo",
  "Keyword" : "Element:Keyword",
  "Literal" : "Element:Literal",
  "MenuChoice" : "Element:MenuChoice",
  "Month" : "Element:Month",
  "Orgdiv" : "Element:Orgdiv",
  "Orgname" : "Element:Orgname",
  "Postcode" : "Element:Postcode",
  "SS-Code" : "Element:SS-Code",
  "SS-Title" : "Element:SS-Title",
  "State" : "Element:State",
  "Street" : "Element:Street",
  "Surname" : "Element:Surname",
  "Volume" : "Element:Volume",
  "Year" : "Element:Year"
}


def revert_flexnames(document):
  if document.backend == "latex":
    flexlist = flex_insets
  else:
    flexlist = flex_elements

  rx = re.compile(r'^\\begin_inset Flex\s+(.+)$')
  i = 0
  while True:
    i = find_token(document.body, "\\begin_inset Flex", i)
    if i == -1:
      return
    m = rx.match(document.body[i])
    if not m:
      document.warning("Illegal flex inset: " + document.body[i])
      i += 1
      continue
    style = m.group(1)
    if style in flexlist:
      document.body[i] = "\\begin_inset Flex " + flexlist[style]
    i += 1


def convert_mathdots(document):
    " Load mathdots automatically "
    i = find_token(document.header, "\\use_mhchem" , 0)
    if i == -1:
        i = find_token(document.header, "\\use_esint" , 0)
    if i == -1:
        document.warning("Malformed LyX document: Can't find \\use_mhchem.")
        return;
    j = find_token(document.preamble, "\\usepackage{mathdots}", 0)
    if j == -1:
        document.header.insert(i + 1, "\\use_mathdots 0")
    else:
        document.header.insert(i + 1, "\\use_mathdots 2")
        del document.preamble[j]


def revert_mathdots(document):
    " Load mathdots if used in the document "

    mathdots = find_token(document.header, "\\use_mathdots" , 0)
    if mathdots == -1:
      document.warning("No \\use_mathdots line. Assuming auto.")
    else:
      val = get_value(document.header, "\\use_mathdots", mathdots)
      del document.header[mathdots]
      try:
        usedots = int(val)
      except:
        document.warning("Invalid \\use_mathdots value: " + val + ". Assuming auto.")
        # probably usedots has not been changed, but be safe.
        usedots = 1

      if usedots == 0:
        # do not load case
        return
      if usedots == 2:
        # force load case
        add_to_preamble(document, ["\\usepackage{mathdots}"])
        return

    # so we are in the auto case. we want to load mathdots if \iddots is used.
    i = 0
    while True:
      i = find_token(document.body, '\\begin_inset Formula', i)
      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 Formula inset at line " + str(i))
        i += 1
        continue
      code = "\n".join(document.body[i:j])
      if code.find("\\iddots") != -1:
        add_to_preamble(document, ["\\@ifundefined{iddots}{\\usepackage{mathdots}}"])
        return
      i = j


def convert_rule(document):
    " Convert \\lyxline to CommandInset line. "
    i = 0

    inset = ['\\begin_inset CommandInset line',
      'LatexCommand rule',
      'offset "0.5ex"',
      'width "100line%"',
      'height "1pt"', '',
      '\\end_inset', '', '']

    # if paragraphs are indented, we may have to unindent to get the
    # line to be full-width.
    indent = get_value(document.header, "\\paragraph_separation", 0)
    have_indent = (indent == "indent")

    while True:
      i = find_token(document.body, "\\lyxline" , i)
      if i == -1:
        return

      # we need to find out if this line follows other content
      # in its paragraph. find its layout....
      lastlay = find_token_backwards(document.body, "\\begin_layout", i)
      if lastlay == -1:
        document.warning("Can't find layout for line at " + str(i))
        # do the best we can.
        document.body[i:i+1] = inset
        i += len(inset)
        continue

      # ...and look for other content before it.
      lineisfirst = True
      for line in document.body[lastlay + 1:i]:
        # is it empty or a paragraph option?
        if not line or line[0] == '\\':
          continue
        lineisfirst = False
        break

      if lineisfirst:
        document.body[i:i+1] = inset
        if indent:
          # we need to unindent, lest the line be too long
          document.body.insert(lastlay + 1, "\\noindent")
        i += len(inset)
      else:
        # so our line is in the middle of a paragraph
        # we need to add a new line, lest this line follow the
        # other content on that line and run off the side of the page
        document.body[i:i+1] = inset
        document.body[i:i] = ["\\begin_inset Newline newline", "\\end_inset", ""]
      i += len(inset)


def revert_rule(document):
    " Revert line insets to Tex code "
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset CommandInset line" , i)
      if i == -1:
        return
      # find end of inset
      j = find_token(document.body, "\\end_inset" , i)
      if j == -1:
        document.warning("Malformed LyX document: Can't find end of line inset.")
        return
      # determine the optional offset
      offset = get_quoted_value(document.body, 'offset', i, j)
      if offset:
        offset = '[' + offset + ']'
      # determine the width
      width = get_quoted_value(document.body, 'width', i, j, "100col%")
      width = latex_length(width)[1]
      # determine the height
      height = get_quoted_value(document.body, 'height', i, j, "1pt")
      height = latex_length(height)[1]
      # output the \rule command
      subst = "\\rule[" + offset + "]{" + width + "}{" + height + "}"
      document.body[i:j + 1] = put_cmd_in_ert(subst)
      i += len(subst) - (j - i)


def revert_diagram(document):
  " Add the feyn package if \\Diagram is used in math "
  i = 0
  while True:
    i = find_token(document.body, '\\begin_inset Formula', i)
    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 Formula inset.")
        return
    lines = "\n".join(document.body[i:j])
    if lines.find("\\Diagram") == -1:
      i = j
      continue
    add_to_preamble(document, ["\\usepackage{feyn}"])
    # only need to do it once!
    return

chapters = ("amsbook", "book", "docbook-book", "elsart", "extbook", "extreport",
    "jbook", "jreport", "jsbook", "literate-book", "literate-report", "memoir",
    "mwbk", "mwrep", "recipebook", "report", "scrbook", "scrreprt", "svmono",
    "svmult", "tbook", "treport", "tufte-book")

def convert_bibtex_clearpage(document):
  " insert a clear(double)page before bibliographystyle if bibtotoc option is used "

  if document.textclass not in chapters:
    return

  i = find_token(document.header, '\\papersides', 0)
  sides = 0
  if i == -1:
    document.warning("Malformed LyX document: Can't find papersides definition.")
    document.warning("Assuming single sided.")
    sides = 1
  else:
    val = get_value(document.header, "\\papersides", i)
    try:
      sides = int(val)
    except:
      pass
    if sides != 1 and sides != 2:
      document.warning("Invalid papersides value: " + val)
      document.warning("Assuming single sided.")
      sides = 1

  j = 0
  while True:
    j = find_token(document.body, "\\begin_inset CommandInset bibtex", j)
    if j == -1:
      return

    k = find_end_of_inset(document.body, j)
    if k == -1:
      document.warning("Can't find end of Bibliography inset at line " + str(j))
      j += 1
      continue

    # only act if there is the option "bibtotoc"
    val = get_value(document.body, 'options', j, k)
    if not val:
      document.warning("Can't find options for bibliography inset at line " + str(j))
      j = k
      continue

    if val.find("bibtotoc") == -1:
      j = k
      continue

    # so we want to insert a new page right before the paragraph that
    # this bibliography thing is in.
    lay = find_token_backwards(document.body, "\\begin_layout", j)
    if lay == -1:
      document.warning("Can't find layout containing bibliography inset at line " + str(j))
      j = k
      continue

    if sides == 1:
      cmd = "clearpage"
    else:
      cmd = "cleardoublepage"
    subst = ['\\begin_layout Standard',
        '\\begin_inset Newpage ' + cmd,
        '\\end_inset', '', '',
        '\\end_layout', '']
    document.body[lay:lay] = subst
    j = k + len(subst)


def revert_bibtex_clearpage(document):
  " remove clear(double)page before bibliographystyle if bibtotoc option is used "

  if document.textclass not in chapters:
    return

  i = find_token(document.header, '\\papersides', 0)
  sides = 0
  if i == -1:
    document.warning("Malformed LyX document: Can't find papersides definition.")
    document.warning("Assuming single sided.")
    sides = 1
  else:
    val = get_value(document.header, "\\papersides", i)
    try:
      sides = int(val)
    except:
      pass
    if sides != 1 and sides != 2:
      document.warning("Invalid papersides value: " + val)
      document.warning("Assuming single sided.")
      sides = 1

  j = 0
  while True:
    j = find_token(document.body, "\\begin_inset CommandInset bibtex", j)
    if j == -1:
      return

    k = find_end_of_inset(document.body, j)
    if k == -1:
      document.warning("Can't find end of Bibliography inset at line " + str(j))
      j += 1
      continue

    # only act if there is the option "bibtotoc"
    val = get_value(document.body, 'options', j, k)
    if not val:
      document.warning("Can't find options for bibliography inset at line " + str(j))
      j = k
      continue

    if val.find("bibtotoc") == -1:
      j = k
      continue

    # we had inserted \\clear[double]page right before the paragraph that
    # this bibliography thing is in. Remove this. The older format has the
    # respective command hardcoded.
    lay = find_token_backwards(document.body, "\\begin_layout", j)
    if lay == -1:
      document.warning("Can't find layout containing bibliography inset at line " + str(j))
      j = k
      continue
    # Find the layout before this.
    lay = find_token_backwards(document.body, "\\begin_layout", lay-1)
    if lay == -1:
      document.warning("Can't find layout before bibliography inset at line " + str(j))
      j = k
      continue

    if sides == 1:
      cmd = "clearpage"
    else:
      cmd = "cleardoublepage"

    if document.body[lay] != "\\begin_layout Standard" or document.body[lay+1] != "\\begin_inset Newpage " + cmd:
        j = k
        continue
    layend = find_end_of_layout(document.body, lay)
    if layend == -1:
      document.warning("Can't find end of layout containg newpage inset at line " + str(layend))
      j += 1
      continue

    del document.body[lay:layend+1]
    j = lay



def check_passthru(document):
  tc = document.textclass
  ok = (tc == "literate-article" or tc == "literate-book" or tc == "literate-report")
  if not ok:
    mods = document.get_module_list()
    for mod in mods:
      if mod == "sweave" or mod == "noweb":
        ok = True
        break
  return ok


def convert_passthru(document):
    " http://www.mail-archive.com/lyx-devel@lists.lyx.org/msg161298.html "
    if not check_passthru:
      return

    rx = re.compile("\\\\begin_layout \\s*(\\w+)")
    beg = 0
    for lay in ["Chunk", "Scrap"]:
      while True:
        beg = find_token(document.body, "\\begin_layout " + lay, beg)
        if beg == -1:
          break
        end = find_end_of_layout(document.body, beg)
        if end == -1:
          document.warning("Can't find end of layout at line " + str(beg))
          beg += 1
          continue

        # we are now going to replace newline insets within this layout
        # by new instances of this layout. so we have repeated layouts
        # instead of newlines.

        # if the paragraph has any customization, however, we do not want to
        # do the replacement.
        if document.body[beg + 1].startswith("\\"):
          beg = end + 1
          continue

        ns = beg
        while True:
          ns = find_token(document.body, "\\begin_inset Newline newline", ns, end)
          if ns == -1:
            break
          ne = find_end_of_inset(document.body, ns)
          if ne == -1 or ne > end:
            document.warning("Can't find end of inset at line " + str(ne))
            ns += 1
            continue
          if document.body[ne + 1] == "":
            ne += 1
          subst = ["\\end_layout", "", "\\begin_layout " + lay]
          document.body[ns:ne + 1] = subst
          # now we need to adjust end, in particular, but might as well
          # do ns properly, too
          newlines = (ne - ns) - len(subst)
          ns += newlines + 2
          end += newlines + 2

        # ok, we now want to find out if the next layout is the
        # same as this one. if so, we will insert an extra copy of it
        didit = False
        next = find_token(document.body, "\\begin_layout", end)
        if next != -1:
          m = rx.match(document.body[next])
          if m:
            nextlay = m.group(1)
            if nextlay == lay:
              subst = ["\\begin_layout " + lay, "", "\\end_layout", ""]
              document.body[next:next] = subst
              didit = True
        beg = end + 1
        if didit:
          beg += 4 # for the extra layout


def revert_passthru(document):
    " http://www.mail-archive.com/lyx-devel@lists.lyx.org/msg161298.html "
    if not check_passthru:
      return
    rx = re.compile("\\\\begin_layout \\s*(\\w+)")
    beg = 0
    for lay in ["Chunk", "Scrap"]:
      while True:
        beg = find_token(document.body, "\\begin_layout " + lay, beg)
        if beg == -1:
          break
        end = find_end_of_layout(document.body, beg)
        if end == -1:
          document.warning("Can't find end of layout at line " + str(beg))
          beg += 1
          continue

        # we now want to find out if the next layout is the
        # same as this one. but we will need to do this over and
        # over again.
        while True:
          next = find_token(document.body, "\\begin_layout", end)
          if next == -1:
            break
          m = rx.match(document.body[next])
          if not m:
            break
          nextlay = m.group(1)
          if nextlay != lay:
            break
          # so it is the same layout again. we now want to know if it is empty.
          # but first let's check and make sure there is no content between the
          # two layouts. i'm not sure if that can happen or not.
          for l in range(end + 1, next):
            if document.body[l] != "":
              document.warning("Found content between adjacent " + lay + " layouts!")
              break
          nextend = find_end_of_layout(document.body, next)
          if nextend == -1:
            document.warning("Can't find end of layout at line " + str(next))
            break
          empty = True
          for l in range(next + 1, nextend):
            if document.body[l] != "":
              empty = False
              break
          if empty:
            # empty layouts just get removed
            # should we check if it's before yet another such layout?
            del document.body[next : nextend + 1]
            # and we do not want to check again. we know the next layout
            # should be another Chunk and should be left as is.
            break
          else:
            # if it's not empty, then we want to insert a newline in place
            # of the layout switch
            subst = ["\\begin_inset Newline newline", "\\end_inset", ""]
            document.body[end : next + 1] = subst
            # and now we have to find the end of the new, larger layout
            newend = find_end_of_layout(document.body, beg)
            if newend == -1:
              document.warning("Can't find end of new layout at line " + str(beg))
              break
            end = newend
        beg = end + 1


def revert_multirowOffset(document):
    " Revert multirow cells with offset in tables to TeX-code"
    # this routine is the same as the revert_multirow routine except that
    # it checks additionally for the offset

    # first, let's find out if we need to do anything
    i = find_token(document.body, '<cell multirow="3" mroffset=', 0)
    if i == -1:
      return

    add_to_preamble(document, ["\\usepackage{multirow}"])

    rgx = re.compile(r'mroffset="[^"]+?"')
    begin_table = 0

    while True:
        # find begin/end of table
        begin_table = find_token(document.body, '<lyxtabular version=', begin_table)
        if begin_table == -1:
            break
        end_table = find_end_of(document.body, begin_table, '<lyxtabular', '</lyxtabular>')
        if end_table == -1:
            document.warning("Malformed LyX document: Could not find end of table.")
            begin_table += 1
            continue
        # does this table have multirow?
        i = find_token(document.body, '<cell multirow="3"', begin_table, end_table)
        if i == -1:
            begin_table = end_table
            continue

        # store the number of rows and columns
        numrows = get_option_value(document.body[begin_table], "rows")
        numcols = get_option_value(document.body[begin_table], "columns")
        try:
          numrows = int(numrows)
          numcols = int(numcols)
        except:
          document.warning("Unable to determine rows and columns!")
          begin_table = end_table
          continue

        mrstarts = []
        multirows = []
        # collect info on rows and columns of this table.
        begin_row = begin_table
        for row in range(numrows):
            begin_row = find_token(document.body, '<row>', begin_row, end_table)
            if begin_row == -1:
              document.warning("Can't find row " + str(row + 1))
              break
            end_row = find_end_of(document.body, begin_row, '<row>', '</row>')
            if end_row == -1:
              document.warning("Can't find end of row " + str(row + 1))
              break
            begin_cell = begin_row
            multirows.append([])
            for column in range(numcols):
                begin_cell = find_token(document.body, '<cell ', begin_cell, end_row)
                if begin_cell == -1:
                  document.warning("Can't find column " + str(column + 1) + \
                    "in row " + str(row + 1))
                  break
                # NOTE
                # this will fail if someone puts "</cell>" in a cell, but
                # that seems fairly unlikely.
                end_cell = find_end_of(document.body, begin_cell, '<cell', '</cell>')
                if end_cell == -1:
                  document.warning("Can't find end of column " + str(column + 1) + \
                    "in row " + str(row + 1))
                  break
                multirows[row].append([begin_cell, end_cell, 0])
                if document.body[begin_cell].find('multirow="3" mroffset=') != -1:
                  multirows[row][column][2] = 3 # begin multirow
                  mrstarts.append([row, column])
                elif document.body[begin_cell].find('multirow="4"') != -1:
                  multirows[row][column][2] = 4 # in multirow
                begin_cell = end_cell
            begin_row = end_row
        # end of table info collection

        # work from the back to avoid messing up numbering
        mrstarts.reverse()
        for m in mrstarts:
            row = m[0]
            col = m[1]
            # get column width
            col_width = get_option_value(document.body[begin_table + 2 + col], "width")
            # "0pt" means that no width is specified
            if not col_width or col_width == "0pt":
              col_width = "*"
            # determine the number of cells that are part of the multirow
            nummrs = 1
            for r in range(row + 1, numrows):
                if multirows[r][col][2] != 4:
                  break
                nummrs += 1
                # take the opportunity to revert this line
                lineno = multirows[r][col][0]
                document.body[lineno] = document.body[lineno].\
                  replace(' multirow="4" ', ' ').\
                  replace('valignment="middle"', 'valignment="top"').\
                  replace(' topline="true" ', ' ')
                # remove bottom line of previous multirow-part cell
                lineno = multirows[r-1][col][0]
                document.body[lineno] = document.body[lineno].replace(' bottomline="true" ', ' ')
            # revert beginning cell
            bcell = multirows[row][col][0]
            ecell = multirows[row][col][1]
            offset = get_option_value(document.body[bcell], "mroffset")
            document.body[bcell] = document.body[bcell].\
              replace(' multirow="3" ', ' ').\
              replace('valignment="middle"', 'valignment="top"')
            # remove mroffset option
            document.body[bcell] = rgx.sub('', document.body[bcell])

            blay = find_token(document.body, "\\begin_layout", bcell, ecell)
            if blay == -1:
              document.warning("Can't find layout for cell!")
              continue
            bend = find_end_of_layout(document.body, blay)
            if bend == -1:
              document.warning("Can't find end of layout for cell!")
              continue
            # do the later one first, so as not to mess up the numbering
            # we are wrapping the whole cell in this ert
            # so before the end of the layout...
            document.body[bend:bend] = put_cmd_in_ert("}")
            # ...and after the beginning
            document.body[blay + 1:blay + 1] = \
              put_cmd_in_ert("\\multirow{" + str(nummrs) + "}{" + col_width + "}[" \
                  + offset + "]{")

        # on to the next table
        begin_table = end_table


def revert_script(document):
    " Convert subscript/superscript inset to TeX code "
    i = 0
    foundsubscript = False
    while True:
        i = find_token(document.body, '\\begin_inset script', i)
        if i == -1:
            break
        z = find_end_of_inset(document.body, i)
        if z == -1:
            document.warning("Malformed LyX document: Can't find end of script inset.")
            i += 1
            continue
        blay = find_token(document.body, "\\begin_layout", i, z)
        if blay == -1:
            document.warning("Malformed LyX document: Can't find layout in script inset.")
            i = z
            continue

        if check_token(document.body[i], "\\begin_inset script subscript"):
            subst = '\\textsubscript{'
            foundsubscript = True
        elif check_token(document.body[i], "\\begin_inset script superscript"):
            subst = '\\textsuperscript{'
        else:
            document.warning("Malformed LyX document: Unknown type of script inset.")
            i = z
            continue
        bend = find_end_of_layout(document.body, blay)
        if bend == -1 or bend > z:
            document.warning("Malformed LyX document: Can't find end of layout in script inset.")
            i = z
            continue
        # remove the \end_layout \end_inset pair
        document.body[bend:z + 1] = put_cmd_in_ert("}")
        document.body[i:blay + 1] = put_cmd_in_ert(subst)
        i += 1
    # these classes provide a \textsubscript command:
    # FIXME: Would be nice if we could use the information of the .layout file here
    classes = ["memoir", "scrartcl", "scrbook", "scrlttr2", "scrreprt"]
    if foundsubscript and find_token_exact(classes, document.textclass, 0) == -1:
        add_to_preamble(document, ['\\usepackage{subscript}'])


def convert_use_xetex(document):
    " convert \\use_xetex to \\use_non_tex_fonts "
    i = find_token(document.header, "\\use_xetex", 0)
    if i == -1:
        document.header.insert(-1, "\\use_non_tex_fonts 0")
    else:
        val = get_value(document.header, "\\use_xetex", 0)
        document.header[i] = "\\use_non_tex_fonts " + val


def revert_use_xetex(document):
    " revert \\use_non_tex_fonts to \\use_xetex "
    i = 0
    i = find_token(document.header, "\\use_non_tex_fonts", 0)
    if i == -1:
        document.warning("Malformed document. No \\use_non_tex_fonts param!")
        return

    val = get_value(document.header, "\\use_non_tex_fonts", 0)
    document.header[i] = "\\use_xetex " + val


def revert_labeling(document):
    koma = ("scrartcl", "scrarticle-beamer", "scrbook", "scrlettr",
        "scrlttr2", "scrreprt")
    if document.textclass in koma:
        return
    i = 0
    while True:
        i = find_token_exact(document.body, "\\begin_layout Labeling", i)
        if i == -1:
            return
        document.body[i] = "\\begin_layout List"


def revert_langpack(document):
    " revert \\language_package parameter "
    i = 0
    i = find_token(document.header, "\\language_package", 0)
    if i == -1:
        document.warning("Malformed document. No \\language_package param!")
        return

    del document.header[i]


def convert_langpack(document):
    " Add \\language_package parameter "
    i = find_token(document.header, r"\language" , 0)
    if i == -1:
        document.warning("Malformed document. No \\language defined!")
        return

    document.header.insert(i + 1, "\\language_package default")


def revert_tabularwidth(document):
  i = 0
  while True:
    i = find_token(document.body, "\\begin_inset Tabular", i)
    if i == -1:
      return
    j = find_end_of_inset(document.body, i)
    if j == -1:
      document.warning("Unable to find end of Tabular inset at line " + str(i))
      i += 1
      continue
    i += 1
    features = find_token(document.body, "<features", i, j)
    if features == -1:
      document.warning("Can't find any features in Tabular inset at line " + str(i))
      i = j
      continue
    if document.body[features].find('alignment="tabularwidth"') != -1:
      remove_option(document.body, features, 'tabularwidth')

def revert_html_css_as_file(document):
  if not del_token(document.header, '\\html_css_as_file', 0):
    document.warning("Malformed LyX document: Missing \\html_css_as_file.")


##
# Conversion hub
#

supported_versions = ["2.0.0","2.0"]
convert = [[346, []],
           [347, []],
           [348, []],
           [349, []],
           [350, []],
           [351, []],
           [352, [convert_splitindex]],
           [353, []],
           [354, []],
           [355, [convert_strikeout]],
           [356, []],
           [357, [convert_ulinelatex]],
           [358, []],
           [359, [convert_nomencl_width]],
           [360, []],
           [361, []],
           [362, []],
           [363, []],
           [364, []],
           [365, []],
           [366, []],
           [367, []],
           [368, []],
           [369, [convert_author_id]],
           [370, []],
           [371, [convert_mhchem]],
           [372, []],
           [373, [merge_gbrief]],
           [374, []],
           [375, []],
           [376, [convert_includeall]],
           [377, []],
           [378, []],
           [379, [convert_math_output]],
           [380, []],
           [381, []],
           [382, []],
           [383, []],
           [384, []],
           [385, []],
           [386, []],
           [387, []],
           [388, []],
           [389, [convert_html_quotes]],
           [390, []],
           [391, []],
           [392, []],
           [393, [convert_optarg]],
           [394, [convert_use_makebox]],
           [395, []],
           [396, []],
           [397, [remove_Nameref]],
           [398, []],
           [399, [convert_mathdots]],
           [400, [convert_rule]],
           [401, []],
           [402, [convert_bibtex_clearpage]],
           [403, [convert_flexnames]],
           [404, [convert_prettyref]],
           [405, []],
           [406, [convert_passthru]],
           [407, []],
           [408, []],
           [409, [convert_use_xetex]],
           [410, []],
           [411, [convert_langpack]],
           [412, []],
           [413, []]
]

revert =  [[412, [revert_html_css_as_file]],
           [411, [revert_tabularwidth]],
           [410, [revert_langpack]],
           [409, [revert_labeling]],
           [408, [revert_use_xetex]],
           [407, [revert_script]],
           [406, [revert_multirowOffset]],
           [405, [revert_passthru]],
           [404, []],
           [403, [revert_refstyle]],
           [402, [revert_flexnames]],
           [401, [revert_bibtex_clearpage]],
           [400, [revert_diagram]],
           [399, [revert_rule]],
           [398, [revert_mathdots]],
           [397, [revert_mathrsfs]],
           [396, []],
           [395, [revert_nameref]],
           [394, [revert_DIN_C_pagesizes]],
           [393, [revert_makebox]],
           [392, [revert_argument]],
           [391, []],
           [390, [revert_align_decimal, revert_IEEEtran]],
           [389, [revert_output_sync]],
           [388, [revert_html_quotes]],
           [387, [revert_pagesizes]],
           [386, [revert_math_scale]],
           [385, [revert_lyx_version]],
           [384, [revert_shadedboxcolor]],
           [383, [revert_fontcolor]],
           [382, [revert_turkmen]],
           [381, [revert_notefontcolor]],
           [380, [revert_equalspacing_xymatrix]],
           [379, [revert_inset_preview]],
           [378, [revert_math_output]],
           [377, []],
           [376, [revert_multirow]],
           [375, [revert_includeall]],
           [374, [revert_includeonly]],
           [373, [revert_html_options]],
           [372, [revert_gbrief]],
           [371, [revert_fontenc]],
           [370, [revert_mhchem]],
           [369, [revert_suppress_date]],
           [368, [revert_author_id]],
           [367, [revert_hspace_glue_lengths]],
           [366, [revert_percent_vspace_lengths, revert_percent_hspace_lengths]],
           [365, [revert_percent_skip_lengths]],
           [364, [revert_paragraph_indentation]],
           [363, [revert_branch_filename]],
           [362, [revert_longtable_align]],
           [361, [revert_applemac]],
           [360, []],
           [359, [revert_nomencl_cwidth]],
           [358, [revert_nomencl_width]],
           [357, [revert_custom_processors]],
           [356, [revert_ulinelatex]],
           [355, []],
           [354, [revert_strikeout]],
           [353, [revert_printindexall]],
           [352, [revert_subindex]],
           [351, [revert_splitindex]],
           [350, [revert_backgroundcolor]],
           [349, [revert_outputformat]],
           [348, [revert_xetex]],
           [347, [revert_phantom, revert_hphantom, revert_vphantom]],
           [346, [revert_tabularvalign]],
           [345, [revert_swiss]]
          ]


if __name__ == "__main__":
    pass