# This file is part of lyx2lyx
# -*- coding: utf-8 -*-
# Copyright (C) 2007-2008 The LyX Team <lyx-devel@lists.lyx.org>
#
# 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 1.6"""

import re
import unicodedata
import sys, os

from parser_tools import find_token, find_end_of, find_tokens, get_value

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


def get_value_string(lines, token, start, end = 0, trim = False, default = ""):
    """ get_value_string(lines, token, start[[, end], trim, default]) -> string

    Return tokens after token as string, in lines, where
    token is the first element. When trim is used, the first and last character
    of the string is trimmed."""

    val = get_value(lines, token, start, end, "")
    if not val:
      return default
    if trim:
      return val[1:-1]
    return val


def find_end_of_inset(lines, i):
    " Find end of inset, where lines[i] is included."
    return find_end_of(lines, i, "\\begin_inset", "\\end_inset")

# WARNING!
# DO NOT do this:
#   document.body[i] = wrap_insert_ert(...)
# wrap_into_ert may returns a multiline string, which should NOT appear
# in document.body. Instead, do something like this:
#   subst = wrap_inset_ert(...)
#   subst = subst.split('\n')
#   document.body[i:i+1] = subst
#   i+= len(subst) - 1
# where the last statement resets the counter to accord with the added
# lines.
def wrap_into_ert(string, src, dst):
    '''Within string, replace occurrences of src with dst, wrapped into ERT
       E.g.: wrap_into_ert('sch\"on', "\\", "\\backslash") is:
       sch<ERT>\\backslash</ERT>"on'''
    return string.replace(src, '\n\\begin_inset ERT\nstatus collapsed\n\\begin_layout Standard\n'
      + dst + '\n\\end_layout\n\\end_inset\n')

def put_cmd_in_ert(string):
    for rep in unicode_reps:
        string = string.replace(rep[1], rep[0].replace('\\\\', '\\'))
    string = string.replace('\\', "\\backslash\n")
    string = "\\begin_inset ERT\nstatus collapsed\n\\begin_layout Standard\n" \
      + string + "\n\\end_layout\n\\end_inset"
    return string

def add_to_preamble(document, text):
    """ Add text to the preamble if it is not already there.
    Only the first line is checked!"""

    if find_token(document.preamble, text[0], 0) != -1:
        return

    document.preamble.extend(text)

def insert_to_preamble(index, document, text):
    """ Insert text to the preamble at a given line"""

    document.preamble.insert(index, text)

# Convert a LyX length into a LaTeX length
def convert_len(len):
    units = {"text%":"\\backslash\ntextwidth", "col%":"\\backslash\ncolumnwidth",
             "page%":"\\backslash\npagewidth", "line%":"\\backslash\nlinewidth",
             "theight%":"\\backslash\ntextheight", "pheight%":"\\backslash\npageheight"}

    # Convert LyX units to LaTeX units
    for unit in units.keys():
        if len.find(unit) != -1:
            len = '%f' % (len2value(len) / 100)
            len = len.strip('0') + units[unit]
            break

    return len

# Return the value of len without the unit in numerical form.
def len2value(len):
    result = re.search('([+-]?[0-9.]+)', len)
    if result:
        return float(result.group(1))
    # No number means 1.0
    return 1.0

# Unfortunately, this doesn't really work, since Standard isn't always default.
# But it's as good as we can do right now.
def find_default_layout(document, start, end):
    l = find_token(document.body, "\\begin_layout Standard", start, end)
    if l == -1:
        l = find_token(document.body, "\\begin_layout PlainLayout", start, end)
    if l == -1:
        l = find_token(document.body, "\\begin_layout Plain Layout", start, end)
    return l

def get_option(document, m, option, default):
    l = document.body[m].find(option)
    val = default
    if l != -1:
        val = document.body[m][l:].split('"')[1]
    return val

def remove_option(document, m, option):
    l = document.body[m].find(option)
    if l != -1:
        val = document.body[m][l:].split('"')[1]
        document.body[m] = document.body[m][:l-1] + document.body[m][l+len(option + '="' + val + '"'):]
    return l

def set_option(document, m, option, value):
    l = document.body[m].find(option)
    if l != -1:
        oldval = document.body[m][l:].split('"')[1]
        l = l + len(option + '="')
        document.body[m] = document.body[m][:l] + value + document.body[m][l+len(oldval):]
    else:
        document.body[m] = document.body[m][:-1] + ' ' + option + '="' + value + '">'
    return l


def read_unicodesymbols():
    " Read the unicodesymbols list of unicode characters and corresponding commands."
    pathname = os.path.abspath(os.path.dirname(sys.argv[0]))
    fp = open(os.path.join(pathname.strip('lyx2lyx'), 'unicodesymbols'))
    spec_chars = []
    # Two backslashes, followed by some non-word character, and then a character
    # in brackets. The idea is to check for constructs like: \"{u}, which is how
    # they are written in the unicodesymbols file; but they can also be written
    # as: \"u or even \" u.
    r = re.compile(r'\\\\(\W)\{(\w)\}')
    for line in fp.readlines():
        if line[0] != '#' and line.strip() != "":
            line=line.replace(' "',' ') # remove all quotation marks with spaces before
            line=line.replace('" ',' ') # remove all quotation marks with spaces after
            line=line.replace(r'\"','"') # replace \" by " (for characters with diaeresis)
            try:
                [ucs4,command,dead] = line.split(None,2)
                if command[0:1] != "\\":
                    continue
                spec_chars.append([command, unichr(eval(ucs4))])
            except:
                continue
            m = r.match(command)
            if m != None:
                command = "\\\\"
                # If the character is a double-quote, then we need to escape it, too,
                # since it is done that way in the LyX file.
                if m.group(1) == "\"":
                    command += "\\"
                commandbl = command
                command += m.group(1) + m.group(2)
                commandbl += m.group(1) + ' ' + m.group(2)
                spec_chars.append([command, unichr(eval(ucs4))])
                spec_chars.append([commandbl, unichr(eval(ucs4))])
    fp.close()
    return spec_chars


def extract_argument(line):
    'Extracts a LaTeX argument from the start of line. Returns (arg, rest).'

    if not line:
        return (None, "")

    bracere = re.compile("(\s*)(.*)")
    n = bracere.match(line)
    whitespace = n.group(1)
    stuff = n.group(2)
    brace = stuff[:1]
    if brace != "[" and brace != "{":
        return (None, line)

    # find closing brace
    remain = stuff[1:]
    pos = 0
    num = 1
    term = "}"
    if brace == "[":
        term = "]"
    skip = False
    for c in remain:
        if skip:
            skip = False
        elif c == "\\":
            skip = True
        elif c == brace:
            num += 1
        elif c == term:
            num -= 1
        if c == 0:
            break
        pos += 1
    if num != 0:
        # We never found the matching brace
        # So, to be on the safe side, let's just return everything
        # which will then get wrapped as ERT
        return (line, "")
    return (line[:pos + 1], line[pos + 1:])


def latex2ert(line, isindex):
    '''Converts LaTeX commands into ERT. line may well be a multi-line
       string when it is returned.'''
    if not line:
        return line

    retval = ""
    ## FIXME Escaped \ ??
    # This regex looks for a LaTeX command---i.e., something of the form
    # "\alPhaStuFF", or "\X", where X is any character---where the command
    # may also be preceded by an additional backslash, which is how it would
    # appear (e.g.) in an InsetIndex.
    labelre = re.compile(r'(.*?)\\?(\\(?:[a-zA-Z]+|.))(.*)')

    m = labelre.match(line)
    while m != None:
        retval += m.group(1)
        cmd = m.group(2)
        end = m.group(3)

        while True:
            (arg, rest) = extract_argument(end)
            if arg == None:
                break
            cmd += arg
            end = rest
        # If we wanted to put labels into an InsetLabel, for example, then we
        # would just need to test here for cmd == "label" and then take some
        # appropriate action, i.e., to use arg to get the content and then
        # wrap it appropriately.
        cmd = put_cmd_in_ert(cmd)
        retval += "\n" + cmd + "\n"
        line = end
        m = labelre.match(line)
    # put all remaining braces in ERT
    line = wrap_into_ert(line, '}', '}')
    line = wrap_into_ert(line, '{', '{')
    if isindex:
        # active character that is not available in all font encodings
        line = wrap_into_ert(line, '|', '|')
    retval += line
    return retval


unicode_reps = read_unicodesymbols()

#Bug 5022....
#Might should do latex2ert first, then deal with stuff that DOESN'T
#end up inside ERT. That routine could be modified so that it returned
#a list of lines, and we could then skip ERT bits and only deal with
#the other bits.
def latex2lyx(data, isindex):
    '''Takes a string, possibly multi-line, and returns the result of
    converting LaTeX constructs into LyX constructs. Returns a list of
    lines, suitable for insertion into document.body.
    The bool isindex specifies whether we are in an index macro (which
    has some specific active characters that need to be ERTed).'''

    if not data:
        return [""]
    retval = []

    # Convert LaTeX to Unicode
    # Commands of this sort need to be checked to make sure they are
    # followed by a non-alpha character, lest we replace too much.
    hardone = re.compile(r'^\\\\[a-zA-Z]+$')

    for rep in unicode_reps:
        if hardone.match(rep[0]):
            pos = 0
            while True:
                pos = data.find(rep[0], pos)
                if pos == -1:
                    break
                nextpos = pos + len(rep[0])
                if nextpos < len(data) and data[nextpos].isalpha():
                    # not the end of that command
                    pos = nextpos
                    continue
                data = data[:pos] + rep[1] + data[nextpos:]
                pos = nextpos
        else:
            data = data.replace(rep[0], rep[1])

    # Generic
    # \" -> ":
    data = wrap_into_ert(data, r'\"', '"')
    # \\ -> \:
    data = data.replace('\\\\', '\\')

    # Math:
    mathre = re.compile('^(.*?)(\$.*?\$)(.*)')
    lines = data.split('\n')
    for line in lines:
        #document.warning("LINE: " + line)
        #document.warning(str(i) + ":" + document.body[i])
        #document.warning("LAST: " + document.body[-1])
        g = line
        m = mathre.match(g)
        while m != None:
            s = m.group(1)
            f = m.group(2).replace('\\\\', '\\')
            g = m.group(3)
            if s:
                # this is non-math!
                s = latex2ert(s, isindex)
                subst = s.split('\n')
                retval += subst
            retval.append("\\begin_inset Formula " + f)
            retval.append("\\end_inset")
            m = mathre.match(g)
        # Handle whatever is left, which is just text
        g = latex2ert(g, isindex)
        subst = g.split('\n')
        retval += subst
    return retval


def lyxline2latex(document, line, inert):
    'Convert some LyX stuff into corresponding LaTeX stuff line-wise, as best we can.'
    if line.startswith("\\begin_inset Formula"):
        line = line[20:]
    elif line.startswith("\\begin_inset Quotes"):
        # For now, we do a very basic reversion. Someone who understands
        # quotes is welcome to fix it up.
        qtype = line[20:].strip()
        # lang = qtype[0]
        side = qtype[1]
        dbls = qtype[2]
        if side == "l":
            if dbls == "d":
                line = "``"
            else:
                line = "`"
        else:
            if dbls == "d":
                line = "''"
            else:
                line = "'"
    elif line.isspace() or \
          line.startswith("\\begin_layout") or \
          line.startswith("\\end_layout") or \
          line.startswith("\\begin_inset") or \
          line.startswith("\\end_inset") or \
          line.startswith("\\lang") or \
          line.strip() == "status collapsed" or \
          line.strip() == "status open":
        #skip all that stuff
        return ""

    # this needs to be added to the preamble because of cases like
    # \textmu, \textbackslash, etc.
    add_to_preamble(document, ['% added by lyx2lyx for converted entries',
                               '\\@ifundefined{textmu}',
                               ' {\\usepackage{textcomp}}{}'])
    # a lossless reversion is not possible
    # try at least to handle some common insets and settings
    if inert:
        line = line.replace(r'\backslash', '\\')
    else:
        line = line.replace('&', '\\&{}')
        line = line.replace('#', '\\#{}')
        line = line.replace('^', '\\^{}')
        line = line.replace('%', '\\%{}')
        line = line.replace('_', '\\_{}')
        line = line.replace('$', '\\${}')

        # Do the LyX text --> LaTeX conversion
        for rep in unicode_reps:
            line = line.replace(rep[1], rep[0].replace('\\\\', '\\') + "{}")
            line = line.replace(r'\backslash', r'\textbackslash{}')
            line = line.replace(r'\series bold', r'\bfseries{}').replace(r'\series default', r'\mdseries{}')
            line = line.replace(r'\shape italic', r'\itshape{}').replace(r'\shape smallcaps', r'\scshape{}')
            line = line.replace(r'\shape slanted', r'\slshape{}').replace(r'\shape default', r'\upshape{}')
            line = line.replace(r'\emph on', r'\em{}').replace(r'\emph default', r'\em{}')
            line = line.replace(r'\noun on', r'\scshape{}').replace(r'\noun default', r'\upshape{}')
            line = line.replace(r'\bar under', r'\underbar{').replace(r'\bar default', r'}')
            line = line.replace(r'\family sans', r'\sffamily{}').replace(r'\family default', r'\normalfont{}')
            line = line.replace(r'\family typewriter', r'\ttfamily{}').replace(r'\family roman', r'\rmfamily{}')
            line = line.replace(r'\InsetSpace ', r'').replace(r'\SpecialChar ', r'')
    return line


def lyx2latex(document, lines):
    'Convert some LyX stuff into corresponding LaTeX stuff, as best we can.'
    # clean up multiline stuff
    content = ""
    ert_end = 0

    for curline in range(len(lines)):
        line = lines[curline]
        if line.startswith("\\begin_inset ERT"):
            # We don't want to replace things inside ERT, so figure out
            # where the end of the inset is.
            ert_end = find_end_of_inset(lines, curline + 1)
            continue
        inert = ert_end >= curline
        content += lyxline2latex(document, lines[curline], inert)
      
    return content


####################################################################

def convert_ltcaption(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 + 1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of tabular.")
            i += 1
            continue

        nrows = int(document.body[i+1].split('"')[3])
        ncols = int(document.body[i+1].split('"')[5])

        m = i + 1
        for k in range(nrows):
            m = find_token(document.body, "<row", m)
            r = m
            caption = 'false'
            for k in range(ncols):
                m = find_token(document.body, "<cell", m)
                if (k == 0):
                    mend = find_token(document.body, "</cell>", m + 1)
                    # first look for caption insets
                    mcap = find_token(document.body, "\\begin_inset Caption", m + 1, mend)
                    # then look for ERT captions
                    if mcap == -1:
                        mcap = find_token(document.body, "caption", m + 1, mend)
                        if mcap > -1:
                            mcap = find_token(document.body, "\\backslash", mcap - 1, mcap)
                    if mcap > -1:
                        caption = 'true'
                if caption == 'true':
                    if (k == 0):
                        set_option(document, r, 'caption', 'true')
                        set_option(document, m, 'multicolumn', '1')
                        set_option(document, m, 'bottomline', 'false')
                        set_option(document, m, 'topline', 'false')
                        set_option(document, m, 'rightline', 'false')
                        set_option(document, m, 'leftline', 'false')
                        #j = find_end_of_inset(document.body, j + 1)
                    else:
                        set_option(document, m, 'multicolumn', '2')
                m = m + 1
            m = m + 1

        i = j + 1


#FIXME Use of wrap_into_ert can confuse lyx2lyx
def revert_ltcaption(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 + 1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of tabular.")
            i += 1
            continue

        m = i + 1
        nrows = int(document.body[i+1].split('"')[3])
        ncols = int(document.body[i+1].split('"')[5])

        for k in range(nrows):
            m = find_token(document.body, "<row", m)
            caption = get_option(document, m, 'caption', 'false')
            if caption == 'true':
                remove_option(document, m, 'caption')
                for k in range(ncols):
                    m = find_token(document.body, "<cell", m)
                    remove_option(document, m, 'multicolumn')
                    if k == 0:
                        m = find_token(document.body, "\\begin_inset Caption", m)
                        if m == -1:
                            return
                        m = find_end_of_inset(document.body, m + 1)
                        document.body[m] += wrap_into_ert("","","\\backslash\n\\backslash\n%")
                    m = m + 1
            m = m + 1
        i = j + 1


def convert_tablines(document):
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Tabular", i)
        if i == -1:
            # LyX 1.3 inserted an extra space between \begin_inset
            # and Tabular so let us try if this is the case and fix it.
            i = find_token(document.body, "\\begin_inset  Tabular", i)
            if i == -1:
                return
            else:
                document.body[i] = "\\begin_inset Tabular"
        j = find_end_of_inset(document.body, i + 1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of tabular.")
            i += 1
            continue

        m = i + 1
        nrows = int(document.body[i+1].split('"')[3])
        ncols = int(document.body[i+1].split('"')[5])

        col_info = []
        for k in range(ncols):
            m = find_token(document.body, "<column", m)
            left = get_option(document, m, 'leftline', 'false')
            right = get_option(document, m, 'rightline', 'false')
            col_info.append([left, right])
            remove_option(document, m, 'leftline')
            remove_option(document, m, 'rightline')
            m = m + 1

        row_info = []
        for k in range(nrows):
            m = find_token(document.body, "<row", m)
            top = get_option(document, m, 'topline', 'false')
            bottom = get_option(document, m, 'bottomline', 'false')
            row_info.append([top, bottom])
            remove_option(document, m, 'topline')
            remove_option(document, m, 'bottomline')
            m = m + 1

        m = i + 1
        mc_info = []
        for k in range(nrows*ncols):
            m = find_token(document.body, "<cell", m)
            mc_info.append(get_option(document, m, 'multicolumn', '0'))
            m = m + 1
        m = i + 1
        for l in range(nrows):
            for k in range(ncols):
                m = find_token(document.body, '<cell', m)
                if mc_info[l*ncols + k] == '0':
                    r = set_option(document, m, 'topline', row_info[l][0])
                    r = set_option(document, m, 'bottomline', row_info[l][1])
                    r = set_option(document, m, 'leftline', col_info[k][0])
                    r = set_option(document, m, 'rightline', col_info[k][1])
                elif mc_info[l*ncols + k] == '1':
                    s = k + 1
                    while s < ncols and mc_info[l*ncols + s] == '2':
                        s = s + 1
                    if s < ncols and mc_info[l*ncols + s] != '1':
                        r = set_option(document, m, 'rightline', col_info[k][1])
                    if k > 0 and mc_info[l*ncols + k - 1] == '0':
                        r = set_option(document, m, 'leftline', col_info[k][0])
                m = m + 1
        i = j + 1


def revert_tablines(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("Malformed LyX document: Could not find end of tabular.")
            i += 1
            continue

        m = i + 1
        nrows = int(document.body[i+1].split('"')[3])
        ncols = int(document.body[i+1].split('"')[5])

        lines = []
        for k in range(nrows*ncols):
            m = find_token(document.body, "<cell", m)
            top = get_option(document, m, 'topline', 'false')
            bottom = get_option(document, m, 'bottomline', 'false')
            left = get_option(document, m, 'leftline', 'false')
            right = get_option(document, m, 'rightline', 'false')
            lines.append([top, bottom, left, right])
            m = m + 1

        # we will want to ignore longtable captions
        m = i + 1
        caption_info = []
        for k in range(nrows):
            m = find_token(document.body, "<row", m)
            caption = get_option(document, m, 'caption', 'false')
            caption_info.append([caption])
            m = m + 1

        m = i + 1
        col_info = []
        for k in range(ncols):
            m = find_token(document.body, "<column", m)
            left = 'true'
            for l in range(nrows):
                left = lines[l*ncols + k][2]
                if left == 'false' and caption_info[l] == 'false':
                    break
            set_option(document, m, 'leftline', left)
            right = 'true'
            for l in range(nrows):
                right = lines[l*ncols + k][3]
                if right == 'false' and caption_info[l] == 'false':
                    break
            set_option(document, m, 'rightline', right)
            m = m + 1

        row_info = []
        for k in range(nrows):
            m = find_token(document.body, "<row", m)
            top = 'true'
            for l in range(ncols):
                top = lines[k*ncols + l][0]
                if top == 'false':
                    break
            if caption_info[k] == 'false':
                top = 'false'
            set_option(document, m, 'topline', top)
            bottom = 'true'
            for l in range(ncols):
                bottom = lines[k*ncols + l][1]
                if bottom == 'false':
                    break
            if caption_info[k] == 'false':
                bottom = 'false'
            set_option(document, m, 'bottomline', bottom)
            m = m + 1

        i = j + 1


def fix_wrong_tables(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 + 1)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of tabular.")
            i += 1
            continue

        m = i + 1
        nrows = int(document.body[i+1].split('"')[3])
        ncols = int(document.body[i+1].split('"')[5])

        for l in range(nrows):
            prev_multicolumn = 0
            for k in range(ncols):
                m = find_token(document.body, '<cell', m)

                if document.body[m].find('multicolumn') != -1:
                    multicol_cont = int(document.body[m].split('"')[1])

                    if multicol_cont == 2 and (k == 0 or prev_multicolumn == 0):
                        document.body[m] = document.body[m][:5] + document.body[m][21:]
                        prev_multicolumn = 0
                    else:
                        prev_multicolumn = multicol_cont
                else:
                    prev_multicolumn = 0

        i = j + 1


def close_begin_deeper(document):
    i = 0
    depth = 0
    while True:
        i = find_tokens(document.body, ["\\begin_deeper", "\\end_deeper"], i)

        if i == -1:
            break

        if document.body[i][:13] == "\\begin_deeper":
            depth += 1
        else:
            depth -= 1

        i += 1

    document.body[-2:-2] = ['\\end_deeper' for i in range(depth)]


def long_charstyle_names(document):
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset CharStyle", i)
        if i == -1:
            return
        document.body[i] = document.body[i].replace("CharStyle ", "CharStyle CharStyle:")
        i += 1

def revert_long_charstyle_names(document):
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset CharStyle", i)
        if i == -1:
            return
        document.body[i] = document.body[i].replace("CharStyle CharStyle:", "CharStyle ")
        i += 1


def axe_show_label(document):
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset CharStyle", i)
        if i == -1:
            return
        if document.body[i + 1].find("show_label") != -1:
            if document.body[i + 1].find("true") != -1:
                document.body[i + 1] = "status open"
                del document.body[ i + 2]
            else:
                if document.body[i + 1].find("false") != -1:
                    document.body[i + 1] = "status collapsed"
                    del document.body[ i + 2]
                else:
                    document.warning("Malformed LyX document: show_label neither false nor true.")
        else:
            document.warning("Malformed LyX document: show_label missing in CharStyle.")

        i += 1


def revert_show_label(document):
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset CharStyle", i)
        if i == -1:
            return
        if document.body[i + 1].find("status open") != -1:
            document.body.insert(i + 1, "show_label true")
        else:
            if document.body[i + 1].find("status collapsed") != -1:
                document.body.insert(i + 1, "show_label false")
            else:
                document.warning("Malformed LyX document: no legal status line in CharStyle.")
        i += 1

def revert_begin_modules(document):
    i = 0
    while True:
        i = find_token(document.header, "\\begin_modules", i)
        if i == -1:
            return
        j = find_end_of(document.header, i, "\\begin_modules", "\\end_modules")
        if j == -1:
            # this should not happen
            break
        document.header[i : j + 1] = []

def convert_flex(document):
    "Convert CharStyle to Flex"
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset CharStyle", i)
        if i == -1:
            return
        document.body[i] = document.body[i].replace('\\begin_inset CharStyle', '\\begin_inset Flex')

def revert_flex(document):
    "Revert Flex to CharStyle"
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Flex", i)
        if i == -1:
            return
        document.body[i] = document.body[i].replace('\\begin_inset Flex', '\\begin_inset CharStyle')


def revert_pdf_options(document):
        "Revert PDF options for hyperref."
        # store the PDF options and delete the entries from the Lyx file
        i = 0
        hyperref = False
        title = ""
        author = ""
        subject = ""
        keywords = ""
        bookmarks = ""
        bookmarksnumbered = ""
        bookmarksopen = ""
        bookmarksopenlevel = ""
        breaklinks = ""
        pdfborder = ""
        colorlinks = ""
        backref = ""
        pagebackref = ""
        pagemode = ""
        otheroptions = ""
        i = find_token(document.header, "\\use_hyperref", i)
        if i != -1:
            hyperref = get_value(document.header, "\\use_hyperref", i) == 'true'
            del document.header[i]
        i = find_token(document.header, "\\pdf_store_options", i)
        if i != -1:
            del document.header[i]
        i = find_token(document.header, "\\pdf_title", 0)
        if i != -1:
            title = get_value_string(document.header, '\\pdf_title', 0, 0, True)
            title = ' pdftitle={' + title + '}'
            del document.header[i]
        i = find_token(document.header, "\\pdf_author", 0)
        if i != -1:
            author = get_value_string(document.header, '\\pdf_author', 0, 0, True)
            if title == "":
                author = ' pdfauthor={' + author + '}'
            else:
                author = ',\n pdfauthor={' + author + '}'
            del document.header[i]
        i = find_token(document.header, "\\pdf_subject", 0)
        if i != -1:
            subject = get_value_string(document.header, '\\pdf_subject', 0, 0, True)
            if title == "" and author == "":
                subject = ' pdfsubject={' + subject + '}'
            else:
                subject = ',\n pdfsubject={' + subject + '}'
            del document.header[i]
        i = find_token(document.header, "\\pdf_keywords", 0)
        if i != -1:
            keywords = get_value_string(document.header, '\\pdf_keywords', 0, 0, True)
            if title == "" and author == "" and subject == "":
                keywords = ' pdfkeywords={' + keywords + '}'
            else:
                keywords = ',\n pdfkeywords={' + keywords + '}'
            del document.header[i]
        i = find_token(document.header, "\\pdf_bookmarks", 0)
        if i != -1:
            bookmarks = get_value_string(document.header, '\\pdf_bookmarks', 0)
            bookmarks = ',\n bookmarks=' + bookmarks
            del document.header[i]
        i = find_token(document.header, "\\pdf_bookmarksnumbered", i)
        if i != -1:
            bookmarksnumbered = get_value_string(document.header, '\\pdf_bookmarksnumbered', 0)
            bookmarksnumbered = ',\n bookmarksnumbered=' + bookmarksnumbered
            del document.header[i]
        i = find_token(document.header, "\\pdf_bookmarksopen", i)
        if i != -1:
            bookmarksopen = get_value_string(document.header, '\\pdf_bookmarksopen', 0)
            bookmarksopen = ',\n bookmarksopen=' + bookmarksopen
            del document.header[i]
        i = find_token(document.header, "\\pdf_bookmarksopenlevel", i)
        if i != -1:
            bookmarksopenlevel = get_value_string(document.header, '\\pdf_bookmarksopenlevel', 0, 0, True)
            bookmarksopenlevel = ',\n bookmarksopenlevel=' + bookmarksopenlevel
            del document.header[i]
        i = find_token(document.header, "\\pdf_breaklinks", i)
        if i != -1:
            breaklinks = get_value_string(document.header, '\\pdf_breaklinks', 0)
            breaklinks = ',\n breaklinks=' + breaklinks
            del document.header[i]
        i = find_token(document.header, "\\pdf_pdfborder", i)
        if i != -1:
            pdfborder = get_value_string(document.header, '\\pdf_pdfborder', 0)
            if pdfborder == 'true':
                pdfborder = ',\n pdfborder={0 0 0}'
            else:
                pdfborder = ',\n pdfborder={0 0 1}'
            del document.header[i]
        i = find_token(document.header, "\\pdf_colorlinks", i)
        if i != -1:
            colorlinks = get_value_string(document.header, '\\pdf_colorlinks', 0)
            colorlinks = ',\n colorlinks=' + colorlinks
            del document.header[i]
        i = find_token(document.header, "\\pdf_backref", i)
        if i != -1:
            backref = get_value_string(document.header, '\\pdf_backref', 0)
            backref = ',\n backref=' + backref
            del document.header[i]
        i = find_token(document.header, "\\pdf_pagebackref", i)
        if i != -1:
            pagebackref = get_value_string(document.header, '\\pdf_pagebackref', 0)
            pagebackref = ',\n pagebackref=' + pagebackref
            del document.header[i]
        i = find_token(document.header, "\\pdf_pagemode", 0)
        if i != -1:
            pagemode = get_value_string(document.header, '\\pdf_pagemode', 0)
            pagemode = ',\n pdfpagemode=' + pagemode
            del document.header[i]
        i = find_token(document.header, "\\pdf_quoted_options", 0)
        if i != -1:
            otheroptions = get_value_string(document.header, '\\pdf_quoted_options', 0, 0, True)
            if title == "" and author == "" and subject == "" and keywords == "":
                otheroptions = ' ' + otheroptions
            else:
                otheroptions = ',\n ' + otheroptions
            del document.header[i]

        # write to the preamble when hyperref was used
        if hyperref == True:
            # preamble write preparations
            # bookmark numbers are only output when they are turned on
            if bookmarksopen == ',\n bookmarksopen=true':
                bookmarksopen = bookmarksopen + bookmarksopenlevel
            if bookmarks == ',\n bookmarks=true':
                bookmarks = bookmarks + bookmarksnumbered + bookmarksopen
            else:
                bookmarks = bookmarks
            # hypersetup is only output when there are things to be set up
            setupstart = '\\hypersetup{%\n'
            setupend = ' }\n'
            if otheroptions == "" and title == "" and  author == ""\
               and  subject == "" and keywords == "":
                setupstart = ""
                setupend = ""
            # write the preamble
            # babel must be loaded before hyperref and hyperref the first part
            # of the preamble, like in LyX 1.6
            insert_to_preamble(0, document,
                                 '% Commands inserted by lyx2lyx for PDF properties\n'
                                 + '\\usepackage{babel}\n'
                                 + '\\usepackage[unicode=true'
                                 + bookmarks
                                 + breaklinks
                                 + pdfborder
                                 + backref
                                 + pagebackref
                                 + colorlinks
                                 + pagemode
                                 + ']\n'
                                 + ' {hyperref}\n'
                                 + setupstart
                                 + title
                                 + author
                                 + subject
                                 + keywords
                                 + otheroptions
                                 + setupend)


def remove_inzip_options(document):
    "Remove inzipName and embed options from the Graphics inset"
    i = 0
    while 1:
        i = find_token(document.body, "\\begin_inset Graphics", i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i + 1)
        if j == -1:
            # should not happen
            document.warning("Malformed LyX document: Could not find end of graphics inset.")
            i += 1
            continue
        # If there's a inzip param, just remove that
        k = find_token(document.body, "\tinzipName", i + 1, j)
        if k != -1:
            del document.body[k]
            # embed option must follow the inzipName option
            del document.body[k+1]
        i = i + 1


def convert_inset_command(document):
    """
        Convert:
            \begin_inset LatexCommand cmd
        to
            \begin_inset CommandInset InsetType
            LatexCommand cmd
    """
    i = 0
    while 1:
        i = find_token(document.body, "\\begin_inset LatexCommand", i)
        if i == -1:
            return
        line = document.body[i]
        r = re.compile(r'\\begin_inset LatexCommand (.*)$')
        m = r.match(line)
        cmdName = m.group(1)
        insetName = ""
        #this is adapted from factory.cpp
        if cmdName[0:4].lower() == "cite":
            insetName = "citation"
        elif cmdName == "url" or cmdName == "htmlurl":
            insetName = "url"
        elif cmdName[-3:] == "ref":
            insetName = "ref"
        elif cmdName == "tableofcontents":
            insetName = "toc"
        elif cmdName == "printnomenclature":
            insetName = "nomencl_print"
        elif cmdName == "printindex":
            insetName = "index_print"
        else:
            insetName = cmdName
        insertion = ["\\begin_inset CommandInset " + insetName, "LatexCommand " + cmdName]
        document.body[i : i+1] = insertion


def revert_inset_command(document):
    """
        Convert:
            \begin_inset CommandInset InsetType
            LatexCommand cmd
        to
            \begin_inset LatexCommand cmd
        Some insets may end up being converted to insets earlier versions of LyX
        will not be able to recognize. Not sure what to do about that.
    """
    i = 0
    while 1:
        i = find_token(document.body, "\\begin_inset CommandInset", i)
        if i == -1:
            return
        nextline = document.body[i+1]
        r = re.compile(r'LatexCommand\s+(.*)$')
        m = r.match(nextline)
        if not m:
            document.warning("Malformed LyX document: Missing LatexCommand in " + document.body[i] + ".")
            i += 1
            continue
        cmdName = m.group(1)
        insertion = ["\\begin_inset LatexCommand " + cmdName]
        document.body[i : i+2] = insertion


def convert_wrapfig_options(document):
    "Convert optional options for wrap floats (wrapfig)."
    # adds the tokens "lines", "placement", and "overhang"
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Wrap figure", i)
        if i == -1:
            return
        document.body.insert(i + 1, "lines 0")
        j = find_token(document.body, "placement", i)
        # placement can be already set or not; if not, set it
        if j == i+2:
            document.body.insert(i + 3, "overhang 0col%")
        else:
           document.body.insert(i + 2, "placement o")
           document.body.insert(i + 3, "overhang 0col%")
        i = i + 1


def revert_wrapfig_options(document):
    "Revert optional options for wrap floats (wrapfig)."
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Wrap figure", i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Can't find end of Wrap inset at line " + str(i))
            i += 1
            continue
        k = find_default_layout(document, i, j)
        if k == -1:
            document.warning("Can't find default layout for Wrap figure!")
            i = j
            continue
        # Options should be between i and k now
        l = find_token(document.body, "lines", i, k)
        if l == -1:
            document.warning("Can't find lines option for Wrap figure!")
            i = k
            continue
        m = find_token(document.body, "overhang", i + 1, k)
        if m == -1:
            document.warning("Malformed LyX document: Couldn't find overhang parameter of wrap float!")
            i = k
            continue
        # Do these in reverse order
        del document.body[m]
        del document.body[l]
        i = k


def convert_latexcommand_index(document):
    "Convert from LatexCommand form to collapsable form."
    i = 0
    r1 = re.compile('name "(.*)"')
    while True:
        i = find_token(document.body, "\\begin_inset CommandInset index", i)
        if i == -1:
            return
        if document.body[i + 1] != "LatexCommand index": # Might also be index_print
            i += 1
            continue
        j = find_end_of_inset(document.body, i + 1)
        if j == -1:
            document.warning("Unable to find end of index inset at line " + str(i) + "!")
            i += 2
            continue
        m = r1.match(document.body[i + 2])
        if m == None:
            document.warning("Unable to match: " + document.body[i+2])
            # this can happen with empty index insets!
            linelist = [""]
        else:
            fullcontent = m.group(1)
            linelist = latex2lyx(fullcontent, True)
        #document.warning(fullcontent)

        linelist = ["\\begin_inset Index", "status collapsed", "\\begin_layout Standard", ""] + \
                   linelist + ["\\end_layout"]
        document.body[i : j] = linelist
        i += len(linelist) - (j - i)


def revert_latexcommand_index(document):
    "Revert from collapsable form to LatexCommand form."
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Index", i)
        if i == -1:
          return
        j = find_end_of_inset(document.body, i + 1)
        if j == -1:
          return

        content = lyx2latex(document, document.body[i:j])
        # escape quotes
        content = content.replace('"', r'\"')
        document.body[i:j] = ["\\begin_inset CommandInset index", "LatexCommand index",
            "name " + '"' + content + '"', ""]
        i += 5


def revert_wraptable(document):
    "Revert wrap table to wrap figure."
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Wrap table", i)
        if i == -1:
            return
        document.body[i] = document.body[i].replace('\\begin_inset Wrap table', '\\begin_inset Wrap figure')
        i = i + 1


def revert_vietnamese(document):
    "Set language Vietnamese to English"
    # Set document language from Vietnamese to English
    i = 0
    if document.language == "vietnamese":
        document.language = "english"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language english"
    j = 0
    while True:
        j = find_token(document.body, "\\lang vietnamese", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang vietnamese", "\\lang english")
        j = j + 1


def convert_japanese_cjk(document):
    "Set language japanese to japanese-cjk"
    # Set document language from japanese-plain to japanese
    i = 0
    if document.language == "japanese":
        document.language = "japanese-cjk"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language japanese-cjk"
    j = 0
    while True:
        j = find_token(document.body, "\\lang japanese", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang japanese", "\\lang japanese-cjk")
        j = j + 1


def revert_japanese(document):
    "Set language japanese-plain to japanese"
    # Set document language from japanese-plain to japanese
    i = 0
    if document.language == "japanese-plain":
        document.language = "japanese"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language japanese"
    j = 0
    while True:
        j = find_token(document.body, "\\lang japanese-plain", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang japanese-plain", "\\lang japanese")
        j = j + 1


def revert_japanese_cjk(document):
    "Set language japanese-cjk to japanese"
    # Set document language from japanese-plain to japanese
    i = 0
    if document.language == "japanese-cjk":
        document.language = "japanese"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language japanese"
    j = 0
    while True:
        j = find_token(document.body, "\\lang japanese-cjk", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang japanese-cjk", "\\lang japanese")
        j = j + 1


def revert_japanese_encoding(document):
    "Set input encoding form EUC-JP-plain to EUC-JP etc."
    # Set input encoding form EUC-JP-plain to EUC-JP etc.
    i = 0
    i = find_token(document.header, "\\inputencoding EUC-JP-plain", 0)
    if i != -1:
        document.header[i] = "\\inputencoding EUC-JP"
    j = 0
    j = find_token(document.header, "\\inputencoding JIS-plain", 0)
    if j != -1:
        document.header[j] = "\\inputencoding JIS"
    k = 0
    k = find_token(document.header, "\\inputencoding SJIS-plain", 0)
    if k != -1: # convert to UTF8 since there is currently no SJIS encoding
        document.header[k] = "\\inputencoding UTF8"


def revert_inset_info(document):
    'Replace info inset with its content'
    i = 0
    while 1:
        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:
            # should not happen
            document.warning("Malformed LyX document: Could not find end of Info inset.")
            i += 1
            continue
        type = 'unknown'
        arg = ''
        for k in range(i, j+1):
            if document.body[k].startswith("arg"):
                arg = document.body[k][3:].strip()
                # remove embracing quotation marks
                if arg[0] == '"':
                    arg = arg[1:]
                if arg[len(arg) - 1] == '"':
                    arg = arg[:len(arg) - 1]
                # \" to straight quote
                arg = arg.replace(r'\"', '"')
                # \ to \backslash
                arg = arg.replace(r'\\', "\\backslash\n")
            if document.body[k].startswith("type"):
                type = document.body[k][4:].strip().strip('"')
        # I think there is a newline after \\end_inset, which should be removed.
        if document.body[j + 1].strip() == "":
            document.body[i : (j + 2)] = [type + ':' + arg]
        else:
            document.body[i : (j + 1)] = [type + ':' + arg]


def convert_pdf_options(document):
    # Set the pdfusetitle tag, delete the pdf_store_options,
    # set quotes for bookmarksopenlevel"
    has_hr = get_value(document.header, "\\use_hyperref", 0, default = "0")
    if has_hr == "1":
        k = find_token(document.header, "\\use_hyperref", 0)
        document.header.insert(k + 1, "\\pdf_pdfusetitle true")
    k = find_token(document.header, "\\pdf_store_options", 0)
    if k != -1:
        del document.header[k]
    i = find_token(document.header, "\\pdf_bookmarksopenlevel", k)
    if i == -1: return
    document.header[i] = document.header[i].replace('"', '')


def revert_pdf_options_2(document):
    # reset the pdfusetitle tag, set quotes for bookmarksopenlevel"
    k = find_token(document.header, "\\use_hyperref", 0)
    i = find_token(document.header, "\\pdf_pdfusetitle", k)
    if i != -1:
        del document.header[i]
    i = find_token(document.header, "\\pdf_bookmarksopenlevel", k)
    if i == -1: return
    values = document.header[i].split()
    values[1] = ' "' + values[1] + '"'
    document.header[i] = ''.join(values)


def convert_htmlurl(document):
    'Convert "htmlurl" to "href" insets for docbook'
    if document.backend != "docbook":
      return
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset CommandInset url", i)
      if i == -1:
        return
      document.body[i] = "\\begin_inset CommandInset href"
      document.body[i + 1] = "LatexCommand href"
      i = i + 1


def convert_url(document):
    'Convert url insets to url charstyles'
    if document.backend == "docbook":
      return
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset CommandInset url", i)
      if i == -1:
        break
      n = find_token(document.body, "name", i)
      if n == i + 2:
        # place the URL name in typewriter before the new URL insert
        # grab the name 'bla' from the e.g. the line 'name "bla"',
        # therefore start with the 6th character
        name = document.body[n][6:-1]
        newname = [name + " "]
        document.body[i:i] = newname
        i = i + 1
      j = find_token(document.body, "target", i)
      if j == -1:
        document.warning("Malformed LyX document: Can't find target for url inset")
        i += 1
        continue
      target = document.body[j][8:-1]
      k = find_token(document.body, "\\end_inset", j)
      if k == -1:
        document.warning("Malformed LyX document: Can't find end of url inset")
        i = j
        continue
      newstuff = ["\\begin_inset Flex URL",
        "status collapsed", "",
        "\\begin_layout Standard",
        "",
        target,
        "\\end_layout",
        ""]
      document.body[i:k] = newstuff
      i = i + len(newstuff)

def convert_ams_classes(document):
  tc = document.textclass
  if (tc != "amsart" and tc != "amsart-plain" and
      tc != "amsart-seq" and tc != "amsbook"):
    return
  if tc == "amsart-plain":
    document.textclass = "amsart"
    document.set_textclass()
    document.add_module("Theorems (Starred)")
    return
  if tc == "amsart-seq":
    document.textclass = "amsart"
    document.set_textclass()
  document.add_module("Theorems (AMS)")

  #Now we want to see if any of the environments in the extended theorems
  #module were used in this document. If so, we'll add that module, too.
  layouts = ["Criterion", "Algorithm", "Axiom", "Condition", "Note",  \
    "Notation", "Summary", "Acknowledgement", "Conclusion", "Fact", \
    "Assumption"]

  r = re.compile(r'^\\begin_layout (.*?)\*?\s*$')
  i = 0
  while True:
    i = find_token(document.body, "\\begin_layout", i)
    if i == -1:
      return
    m = r.match(document.body[i])
    if m == None:
      # This is an empty layout
      # document.warning("Weirdly formed \\begin_layout at line %d of body!" % i)
      i += 1
      continue
    m = m.group(1)
    if layouts.count(m) != 0:
      document.add_module("Theorems (AMS-Extended)")
      return
    i += 1

def revert_href(document):
    'Reverts hyperlink insets (href) to url insets (url)'
    i = 0
    while True:
      i = find_token(document.body, "\\begin_inset CommandInset href", i)
      if i == -1:
          return
      document.body[i : i + 2] = \
        ["\\begin_inset CommandInset url", "LatexCommand url"]
      i = i + 2

def revert_url(document):
    'Reverts Flex URL insets to old-style URL insets'
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Flex URL", i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Can't find end of inset in revert_url!")
            return
        k = find_default_layout(document, i, j)
        if k == -1:
            document.warning("Can't find default layout in revert_url!")
            i = j
            continue
        l = find_end_of(document.body, k, "\\begin_layout", "\\end_layout")
        if l == -1 or l >= j:
            document.warning("Can't find end of default layout in revert_url!")
            i = j
            continue
        # OK, so the inset's data is between lines k and l.
        data =  " ".join(document.body[k+1:l])
        data = data.strip()
        newinset = ["\\begin_inset LatexCommand url", "target \"" + data + "\"",\
                    "", "\\end_inset"]
        document.body[i:j+1] = newinset
        i = i + len(newinset)


def convert_include(document):
  'Converts include insets to new format.'
  i = 0
  r = re.compile(r'\\begin_inset Include\s+\\([^{]+){([^}]*)}(?:\[(.*)\])?')
  while True:
    i = find_token(document.body, "\\begin_inset Include", i)
    if i == -1:
      return
    line = document.body[i]
    previewline = document.body[i + 1]
    m = r.match(line)
    if m == None:
      document.warning("Unable to match line " + str(i) + " of body!")
      i += 1
      continue
    cmd = m.group(1)
    fn  = m.group(2)
    opt = m.group(3)
    insertion = ["\\begin_inset CommandInset include",
       "LatexCommand " + cmd, previewline,
       "filename \"" + fn + "\""]
    newlines = 2
    if opt:
      insertion.append("lstparams " + '"' + opt + '"')
      newlines += 1
    document.body[i : i + 2] = insertion
    i += newlines


def revert_include(document):
  'Reverts include insets to old format.'
  i = 0
  r0 = re.compile('preview.*')
  r1 = re.compile('LatexCommand (.+)')
  r2 = re.compile('filename "(.+)"')
  r3 = re.compile('lstparams "(.*)"')
  while True:
    i = find_token(document.body, "\\begin_inset CommandInset include", i)
    if i == -1:
      return
    nextline = i + 1
    m = r1.match(document.body[nextline])
    if m == None:
      document.warning("Malformed LyX document: No LatexCommand line for `" +
        document.body[i] + "' on line " + str(i) + ".")
      i += 1
      continue
    cmd = m.group(1)
    nextline += 1
    if r0.match(document.body[nextline]):
      previewline = document.body[nextline]
      nextline += 1
    else:
      previewline = ""
    m = r2.match(document.body[nextline])
    if m == None:
      document.warning("Malformed LyX document: No filename line for `" + \
        document.body[i] + "' on line " + str(i) + ".")
      i += 2
      continue
    fn = m.group(1)
    nextline += 1
    options = ""
    if (cmd == "lstinputlisting"):
      m = r3.match(document.body[nextline])
      if m != None:
        options = m.group(1)
        numlines = 5
        nextline += 1
    newline = "\\begin_inset Include \\" + cmd + "{" + fn + "}"
    if options:
      newline += ("[" + options + "]")
    insertion = [newline]
    if previewline != "":
      insertion.append(previewline)
    document.body[i : nextline] = insertion
    i += 2


def revert_albanian(document):
    "Set language Albanian to English"
    i = 0
    if document.language == "albanian":
        document.language = "english"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language english"
    j = 0
    while True:
        j = find_token(document.body, "\\lang albanian", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang albanian", "\\lang english")
        j = j + 1


def revert_lowersorbian(document):
    "Set language lower Sorbian to English"
    i = 0
    if document.language == "lowersorbian":
        document.language = "english"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language english"
    j = 0
    while True:
        j = find_token(document.body, "\\lang lowersorbian", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang lowersorbian", "\\lang english")
        j = j + 1


def revert_uppersorbian(document):
    "Set language uppersorbian to usorbian as this was used in LyX 1.5"
    i = 0
    if document.language == "uppersorbian":
        document.language = "usorbian"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language usorbian"
    j = 0
    while True:
        j = find_token(document.body, "\\lang uppersorbian", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang uppersorbian", "\\lang usorbian")
        j = j + 1


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


def convert_macro_global(document):
    "Remove TeX code command \global when it is in front of a macro"
    # math macros are nowadays already defined \global, so that an additional
    # \global would make the document uncompilable, see
    # http://www.lyx.org/trac/ticket/5371
    # We're looking for something like this:
    # \begin_inset ERT
    # status collapsed
    #
    # \begin_layout Plain Layout
    #
    #
    # \backslash
    # global
    # \end_layout
    #
    # \end_inset
    #
    #
    # \begin_inset FormulaMacro
    # \renewcommand{\foo}{123}
    # \end_inset
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset FormulaMacro", i)
        if i == -1:
            return
        # if i <= 13, then there isn't enough room for the ERT
        if i <= 12:
            i += 1
            continue
        if document.body[i-6] == "global":
            del document.body[i-13 : i]
            i = i - 12
        else:
            i += 1


def revert_macro_optional_params(document):
    "Convert macro definitions with optional parameters into ERTs"
    # Stub to convert macro definitions with one or more optional parameters
    # into uninterpreted ERT insets


def revert_hyperlinktype(document):
    'Reverts hyperlink type'
    i = 0
    j = 0
    while True:
      i = find_token(document.body, "target", i)
      if i == -1:
          return
      j = find_token(document.body, "type", i)
      if j == -1:
          return
      if j == i + 1:
          del document.body[j]
      i = i + 1


def revert_pagebreak(document):
    'Reverts pagebreak to ERT'
    i = 0
    while True:
      i = find_token(document.body, "\\pagebreak", i)
      if i == -1:
          return
      document.body[i] = '\\begin_inset ERT\nstatus collapsed\n\n' \
      '\\begin_layout Standard\n\n\n\\backslash\n' \
      'pagebreak{}\n\\end_layout\n\n\\end_inset\n\n'
      i = i + 1


def revert_linebreak(document):
    'Reverts linebreak to ERT'
    i = 0
    while True:
      i = find_token(document.body, "\\linebreak", i)
      if i == -1:
          return
      document.body[i] = '\\begin_inset ERT\nstatus collapsed\n\n' \
      '\\begin_layout Standard\n\n\n\\backslash\n' \
      'linebreak{}\n\\end_layout\n\n\\end_inset\n\n'
      i = i + 1


def revert_latin(document):
    "Set language Latin to English"
    i = 0
    if document.language == "latin":
        document.language = "english"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language english"
    j = 0
    while True:
        j = find_token(document.body, "\\lang latin", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang latin", "\\lang english")
        j = j + 1


def revert_samin(document):
    "Set language North Sami to English"
    i = 0
    if document.language == "samin":
        document.language = "english"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language english"
    j = 0
    while True:
        j = find_token(document.body, "\\lang samin", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang samin", "\\lang english")
        j = j + 1


def convert_serbocroatian(document):
    "Set language Serbocroatian to Croatian as this was really Croatian in LyX 1.5"
    i = 0
    if document.language == "serbocroatian":
        document.language = "croatian"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language croatian"
    j = 0
    while True:
        j = find_token(document.body, "\\lang serbocroatian", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang serbocroatian", "\\lang croatian")
        j = j + 1


def convert_framed_notes(document):
    "Convert framed notes to boxes. "
    i = 0
    while 1:
        i = find_tokens(document.body, ["\\begin_inset Note Framed", "\\begin_inset Note Shaded"], i)
        if i == -1:
            return
        subst = [document.body[i].replace("\\begin_inset Note", "\\begin_inset Box"),
                 'position "t"',
                 'hor_pos "c"',
                 'has_inner_box 0',
                 'inner_pos "t"',
                 'use_parbox 0',
                 'width "100col%"',
                 'special "none"',
                 'height "1in"',
                 'height_special "totalheight"']
        document.body[i:i+1] = subst
        i = i + 9


def convert_module_names(document):
  modulemap = { 'Braille' : 'braille', 'Endnote' : 'endnotes', 'Foot to End' : 'foottoend',\
    'Hanging' : 'hanging', 'Linguistics' : 'linguistics', 'Logical Markup' : 'logicalmkup', \
    'Theorems (AMS-Extended)' : 'theorems-ams-extended', 'Theorems (AMS)' : 'theorems-ams', \
    'Theorems (Order By Chapter)' : 'theorems-chap', 'Theorems (Order By Section)' : 'theorems-sec', \
    'Theorems (Starred)' : 'theorems-starred', 'Theorems' : 'theorems-std' }
  modlist = document.get_module_list()
  if len(modlist) == 0:
    return
  newmodlist = []
  for mod in modlist:
    if modulemap.has_key(mod):
      newmodlist.append(modulemap[mod])
    else:
      document.warning("Can't find module %s in the module map!" % mod)
      newmodlist.append(mod)
  document.set_module_list(newmodlist)


def revert_module_names(document):
  modulemap = { 'braille' : 'Braille', 'endnotes' : 'Endnote', 'foottoend' : 'Foot to End',\
    'hanging' : 'Hanging', 'linguistics' : 'Linguistics', 'logicalmkup' : 'Logical Markup', \
    'theorems-ams-extended' : 'Theorems (AMS-Extended)', 'theorems-ams' : 'Theorems (AMS)', \
    'theorems-chap' : 'Theorems (Order By Chapter)', 'theorems-sec' : 'Theorems (Order By Section)', \
    'theorems-starred' : 'Theorems (Starred)', 'theorems-std' : 'Theorems'}
  modlist = document.get_module_list()
  if len(modlist) == 0:
    return
  newmodlist = []
  for mod in modlist:
    if mod in modulemap:
      newmodlist.append(modulemap[mod])
    else:
      document.warning("Can't find module %s in the module map!" % mod)
      newmodlist.append(mod)
  document.set_module_list(newmodlist)


def revert_colsep(document):
    i = find_token(document.header, "\\columnsep", 0)
    if i == -1:
        return
    colsepline = document.header[i]
    r = re.compile(r'\\columnsep (.*)')
    m = r.match(colsepline)
    if not m:
        document.warning("Malformed column separation line!")
        return
    colsep = m.group(1)
    del document.header[i]
    #it seems to be safe to add the package even if it is already used
    pretext = ["\\usepackage{geometry}", "\\geometry{columnsep=" + colsep + "}"]

    add_to_preamble(document, pretext)


def revert_framed_notes(document):
    "Revert framed boxes to notes. "
    i = 0
    while 1:
        i = find_tokens(document.body, ["\\begin_inset Box Framed", "\\begin_inset Box Shaded"], i)

        if i == -1:
            return
        j = find_end_of_inset(document.body, i + 1)
        if j == -1:
            # should not happen
            document.warning("Malformed LyX document: Could not find end of Box inset.")
            i += 1
            continue
        k = find_token(document.body, "status", i + 1, j)
        if k == -1:
            document.warning("Malformed LyX document: Missing `status' tag in Box inset.")
            i = j
            continue
        status = document.body[k]
        l = find_default_layout(document, i + 1, j)
        if l == -1:
            document.warning("Malformed LyX document: Missing `\\begin_layout' in Box inset.")
            i = j
            continue
        m = find_token(document.body, "\\end_layout", i + 1, j)
        if m == -1:
            document.warning("Malformed LyX document: Missing `\\end_layout' in Box inset.")
            i = j
            continue
        ibox = find_token(document.body, "has_inner_box 1", i + 1, k)
        pbox = find_token(document.body, "use_parbox 1", i + 1, k)
        if ibox == -1 and pbox == -1:
            document.body[i] = document.body[i].replace("\\begin_inset Box", "\\begin_inset Note")
            del document.body[i+1:k]
        else:
            document.body[i] = document.body[i].replace("\\begin_inset Box Shaded", "\\begin_inset Box Frameless")
            subst1 = [document.body[l],
                      "\\begin_inset Note Shaded",
                      status,
                      '\\begin_layout Standard']
            document.body[l:l + 1] = subst1
            subst2 = [document.body[m], "\\end_layout", "\\end_inset"]
            document.body[m:m + 1] = subst2
        i = i + 1


def revert_slash(document):
    'Revert \\SpecialChar \\slash{} to ERT'
    i = 0
    while i < len(document.body):
        m = re.match(r'(.*)\\SpecialChar \\slash{}(.*)', document.body[i])
        if m:
            before = m.group(1)
            after = m.group(2)
            subst = [before,
                     '\\begin_inset ERT',
                     'status collapsed', '',
                     '\\begin_layout Standard',
                     '', '', '\\backslash',
                     'slash{}',
                     '\\end_layout', '',
                     '\\end_inset', '',
                     after]
            document.body[i: i+1] = subst
            i = i + len(subst)
        else:
            i = i + 1


def revert_nobreakdash(document):
    'Revert \\SpecialChar \\nobreakdash- to ERT'
    i = 0
    while i < len(document.body):
        m = re.match(r'(.*)\\SpecialChar \\nobreakdash-(.*)', document.body[i])
        if m:
            before = m.group(1)
            after = m.group(2)
            subst = [before,
                     '\\begin_inset ERT',
                    'status collapsed', '',
                    '\\begin_layout Standard', '', '',
                    '\\backslash',
                    'nobreakdash-',
                    '\\end_layout', '',
                    '\\end_inset', '',
                     after]
            document.body[i: i+1] = subst
            i = i + len(subst)
            j = find_token(document.header, "\\use_amsmath", 0)
            if j == -1:
                document.warning("Malformed LyX document: Missing '\\use_amsmath'.")
                i += 1
                continue
            document.header[j] = "\\use_amsmath 2"
        else:
            i = i + 1


#Returns number of lines added/removed
def revert_nocite_key(body, start, end):
    'key "..." -> \nocite{...}'
    r = re.compile(r'^key "(.*)"')
    i = start
    j = end
    while i < j:
        m = r.match(body[i])
        if m:
            body[i:i+1] = ["\\backslash", "nocite{" + m.group(1) + "}"]
            j += 1     # because we added a line
            i += 2     # skip that line
        else:
            del body[i]
            j -= 1     # because we deleted a line
            # no need to change i, since it now points to the next line
    return j - end


def revert_nocite(document):
    "Revert LatexCommand nocite to ERT"
    i = 0
    while 1:
        i = find_token(document.body, "\\begin_inset CommandInset citation", i)
        if i == -1:
            return
        if (document.body[i+1] != "LatexCommand nocite"):
            # note that we already incremented i
            i = i + 1
            continue
        insetEnd = find_end_of_inset(document.body, i)
        if insetEnd == -1:
            #this should not happen
            document.warning("End of CommandInset citation not found in revert_nocite!")
            return

        paramLocation = i + 2 #start of the inset's parameters
        addedLines = 0
        document.body[i:i+2] = \
            ["\\begin_inset ERT", "status collapsed", "", "\\begin_layout Standard"]
        # that added two lines
        paramLocation += 2
        insetEnd += 2
        #print insetEnd, document.body[i: insetEnd + 1]
        insetEnd += revert_nocite_key(document.body, paramLocation, insetEnd)
        #print insetEnd, document.body[i: insetEnd + 1]
        document.body.insert(insetEnd, "\\end_layout")
        document.body.insert(insetEnd + 1, "")
        i = insetEnd + 1


def revert_btprintall(document):
    "Revert (non-bibtopic) btPrintAll option to ERT \nocite{*}"
    i = find_token(document.header, '\\use_bibtopic', 0)
    if i == -1:
        document.warning("Malformed lyx document: Missing '\\use_bibtopic'.")
        return
    if get_value(document.header, '\\use_bibtopic', 0) == "false":
        i = 0
        while i < len(document.body):
            i = find_token(document.body, "\\begin_inset CommandInset bibtex", i)
            if i == -1:
                return
            j = find_end_of_inset(document.body, i + 1)
            if j == -1:
                #this should not happen
                document.warning("End of CommandInset bibtex not found in revert_btprintall!")
                j = len(document.body)
            # this range isn't really right, but it should be OK, since we shouldn't
            # see more than one matching line in each inset
            addedlines = 0
            for k in range(i, j):
                if (document.body[k] == 'btprint "btPrintAll"'):
                    del document.body[k]
                    subst = ["\\begin_inset ERT",
                             "status collapsed", "",
                             "\\begin_layout Standard", "",
                             "\\backslash",
                             "nocite{*}",
                             "\\end_layout",
                             "\\end_inset"]
                    document.body[i:i] = subst
                    addlines = addedlines + len(subst) - 1
            i = j + addedlines


def revert_bahasam(document):
    "Set language Bahasa Malaysia to Bahasa Indonesia"
    i = 0
    if document.language == "bahasam":
        document.language = "bahasa"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language bahasa"
    j = 0
    while True:
        j = find_token(document.body, "\\lang bahasam", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang bahasam", "\\lang bahasa")
        j = j + 1


def revert_interlingua(document):
    "Set language Interlingua to English"
    i = 0
    if document.language == "interlingua":
        document.language = "english"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language english"
    j = 0
    while True:
        j = find_token(document.body, "\\lang interlingua", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang interlingua", "\\lang english")
        j = j + 1


def revert_serbianlatin(document):
    "Set language Serbian-Latin to Croatian"
    i = 0
    if document.language == "serbian-latin":
        document.language = "croatian"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language croatian"
    j = 0
    while True:
        j = find_token(document.body, "\\lang serbian-latin", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang serbian-latin", "\\lang croatian")
        j = j + 1


def revert_rotfloat(document):
    " Revert sideways custom floats. "
    i = 0
    while 1:
        # whitespace intended (exclude \\begin_inset FloatList)
        i = find_token(document.body, "\\begin_inset Float ", i)
        if i == -1:
            return
        line = document.body[i]
        r = re.compile(r'\\begin_inset Float (.*)$')
        m = r.match(line)
        if m == None:
            document.warning("Unable to match line " + str(i) + " of body!")
            i += 1
            continue
        floattype = m.group(1)
        if floattype == "figure" or floattype == "table":
            i += 1
            continue
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed lyx document: Missing '\\end_inset' in revert_rotfloat.")
            i += 1
            continue
        addedLines = 0
        if get_value(document.body, 'sideways', i, j) == "false":
            i += 1
            continue
        l = find_default_layout(document, i + 1, j)
        if l == -1:
            document.warning("Malformed LyX document: Missing `\\begin_layout' in Float inset.")
            i = j
            continue
        subst = ['\\begin_layout Standard',
                  '\\begin_inset ERT',
                  'status collapsed', '',
                  '\\begin_layout Standard', '', '',
                  '\\backslash', '',
                  'end{sideways' + floattype + '}',
                  '\\end_layout', '', '\\end_inset']
        document.body[j : j+1] = subst
        addedLines = len(subst) - 1
        del document.body[i+1 : l]
        addedLines -= (l-1) - (i+1)
        subst = ['\\begin_inset ERT', 'status collapsed', '',
                  '\\begin_layout Standard', '', '', '\\backslash',
                  'begin{sideways' + floattype + '}',
                  '\\end_layout', '', '\\end_inset', '',
                  '\\end_layout', '']
        document.body[i : i+1] = subst
        addedLines += len(subst) - 1
        if floattype == "algorithm":
            add_to_preamble(document,
                            ['% Commands inserted by lyx2lyx for sideways algorithm float',
                              '\\usepackage{rotfloat}',
                              '\\floatstyle{ruled}',
                              '\\newfloat{algorithm}{tbp}{loa}',
                              '\\floatname{algorithm}{Algorithm}'])
        else:
            document.warning("Cannot create preamble definition for custom float" + floattype + ".")
        i += addedLines + 1


def revert_widesideways(document):
    " Revert wide sideways floats. "
    i = 0
    while 1:
        # whitespace intended (exclude \\begin_inset FloatList)
        i = find_token(document.body, '\\begin_inset Float ', i)
        if i == -1:
            return
        line = document.body[i]
        r = re.compile(r'\\begin_inset Float (.*)$')
        m = r.match(line)
        if m == None:
            document.warning("Unable to match line " + str(i) + " of body!")
            i += 1
            continue
        floattype = m.group(1)
        if floattype != "figure" and floattype != "table":
            i += 1
            continue
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed lyx document: Missing '\\end_inset' in revert_widesideways.")
            i += 1
            continue
        if get_value(document.body, 'sideways', i, j) == "false" or \
           get_value(document.body, 'wide', i, j) == "false":
             i += 1
             continue
        l = find_default_layout(document, i + 1, j)
        if l == -1:
            document.warning("Malformed LyX document: Missing `\\begin_layout' in Float inset.")
            i = j
            continue
        subst = ['\\begin_layout Standard', '\\begin_inset ERT',
                  'status collapsed', '',
                  '\\begin_layout Standard', '', '', '\\backslash',
                  'end{sideways' + floattype + '*}',
                  '\\end_layout', '', '\\end_inset']
        document.body[j : j+1] = subst
        addedLines = len(subst) - 1
        del document.body[i+1:l-1]
        addedLines -= (l-1) - (i+1)
        subst = ['\\begin_inset ERT', 'status collapsed', '',
                 '\\begin_layout Standard', '', '', '\\backslash',
                 'begin{sideways' + floattype + '*}', '\\end_layout', '',
                 '\\end_inset', '', '\\end_layout', '']
        document.body[i : i+1] = subst
        addedLines += len(subst) - 1
        add_to_preamble(document, ['\\usepackage{rotfloat}\n'])
        i += addedLines + 1


def revert_inset_embedding(document, type):
    ' Remove embed tag from certain type of insets'
    i = 0
    while 1:
        i = find_token(document.body, "\\begin_inset %s" % type, i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed lyx document: Missing '\\end_inset' in revert_inset_embedding.")
            i = i + 1
            continue
        k = find_token(document.body, "\tembed", i, j)
        if k == -1:
            k = find_token(document.body, "embed", i, j)
        if k != -1:
            del document.body[k]
        i = i + 1


def revert_external_embedding(document):
    ' Remove embed tag from external inset '
    revert_inset_embedding(document, 'External')


def convert_subfig(document):
    " Convert subfigures to subfloats. "
    i = 0
    while 1:
        addedLines = 0
        i = find_token(document.body, '\\begin_inset Graphics', i)
        if i == -1:
            return
        endInset = find_end_of_inset(document.body, i)
        if endInset == -1:
            document.warning("Malformed lyx document: Missing '\\end_inset' in convert_subfig.")
            i += 1
            continue
        k = find_token(document.body, '\tsubcaption', i, endInset)
        if k == -1:
            i = endInset
            continue
        l = find_token(document.body, '\tsubcaptionText', i, endInset)
        if l == -1:
            caption = ""
        else:
            caption = document.body[l][16:].strip('"')
            del document.body[l]
            addedLines -= 1
        del document.body[k]
        addedLines -= 1
        subst = ['\\begin_inset Float figure', 'wide false', 'sideways false',
                 'status open', '', '\\begin_layout Plain Layout', '\\begin_inset Caption',
                 '', '\\begin_layout Plain Layout'] + latex2lyx(caption, False) + \
                 [ '\\end_layout', '', '\\end_inset', '',
                 '\\end_layout', '', '\\begin_layout Plain Layout']
        document.body[i : i] = subst
        addedLines += len(subst)
        endInset += addedLines
        subst = ['', '\\end_inset', '', '\\end_layout']
        document.body[endInset : endInset] = subst
        addedLines += len(subst)
        i += addedLines + 1


def revert_subfig(document):
    " Revert subfloats. "
    i = 0
    while 1:
        # whitespace intended (exclude \\begin_inset FloatList)
        i = find_tokens(document.body, ['\\begin_inset Float ', '\\begin_inset Wrap'], i)
        if i == -1:
            return
        j = 0
        addedLines = 0
        while j != -1:
            j = find_end_of_inset(document.body, i)
            if j == -1:
                document.warning("Malformed lyx document: Missing '\\end_inset' (float) at line " + str(i + len(document.header)) + ".\n\t" + document.body[i])
                # document.warning(document.body[i-1] + "\n" + document.body[i+1])
                i += 1
                continue # this will get us back to the outer loop, since j == -1
            # look for embedded float (= subfloat)
            # whitespace intended (exclude \\begin_inset FloatList)
            k = find_token(document.body, '\\begin_inset Float ', i + 1, j)
            if k == -1:
                break
            # is the subfloat aligned?
            al = find_token(document.body, '\\align ', k - 1, j)
            alignment_beg = ""
            alignment_end = ""
            if al != -1:
                if get_value(document.body, '\\align', al) == "center":
                    alignment_beg = "\\backslash\nbegin{centering}"
                    alignment_end = "\\backslash\npar\\backslash\nend{centering}"
                elif get_value(document.body, '\\align', al) == "left":
                    alignment_beg = "\\backslash\nbegin{raggedright}"
                    alignment_end = "\\backslash\npar\\backslash\nend{raggedright}"
                elif get_value(document.body, '\\align', al) == "right":
                    alignment_beg = "\\backslash\nbegin{raggedleft}"
                    alignment_end = "\\backslash\npar\\backslash\nend{raggedleft}"
            l = find_end_of_inset(document.body, k)
            if l == -1:
                document.warning("Malformed lyx document: Missing '\\end_inset' (embedded float).")
                i += 1
                j = -1
                continue # escape to the outer loop
            m = find_default_layout(document, k + 1, l)
            # caption?
            cap = find_token(document.body, '\\begin_inset Caption', k + 1, l)
            caption = ''
            shortcap = ''
            capend = cap
            if cap != -1:
                capend = find_end_of_inset(document.body, cap)
                if capend == -1:
                    document.warning("Malformed lyx document: Missing '\\end_inset' (caption).")
                    return
                # label?
                label = ''
                lbl = find_token(document.body, '\\begin_inset CommandInset label', cap, capend)
                if lbl != -1:
                    lblend = find_end_of_inset(document.body, lbl + 1)
                    if lblend == -1:
                        document.warning("Malformed lyx document: Missing '\\end_inset' (label).")
                        return
                    for line in document.body[lbl:lblend + 1]:
                        if line.startswith('name '):
                            label = line.split()[1].strip('"')
                            break
                else:
                    lbl = capend
                    lblend = capend
                    label = ''
                # opt arg?
                opt = find_token(document.body, '\\begin_inset OptArg', cap, capend)
                if opt != -1:
                    optend = find_end_of_inset(document.body, opt)
                    if optend == -1:
                        document.warning("Malformed LyX document: Missing '\\end_inset' (OptArg).")
                        return
                    optc = find_default_layout(document, opt, optend)
                    if optc == -1:
                        document.warning("Malformed LyX document: Missing `\\begin_layout' in Float inset.")
                        return
                    optcend = find_end_of(document.body, optc, "\\begin_layout", "\\end_layout")
                    for line in document.body[optc:optcend]:
                        if not line.startswith('\\'):
                            shortcap += line.strip()
                else:
                    opt = capend
                    optend = capend
                for line in document.body[cap:capend]:
                    if line in document.body[lbl:lblend]:
                        continue
                    elif line in document.body[opt:optend]:
                        continue
                    else:
                        inert = True
                        caption += lyxline2latex(document, line, inert)
                if len(label) > 0:
                    caption += "\n\\backslash\nlabel{" + label + "}"
            subst = '\\begin_layout PlainLayout\n\\begin_inset ERT\nstatus collapsed\n\n' \
                      '\\begin_layout PlainLayout\n\n}' + alignment_end + \
                      '\n\\end_layout\n\n\\end_inset\n\n' \
                      '\\end_layout\n\n\\begin_layout PlainLayout\n'
            subst = subst.split('\n')
            document.body[l : l+1] = subst
            addedLines = len(subst) - 1
            # this is before l and so is unchanged by the multiline insertion
            if cap != capend:
                del document.body[cap:capend+1]
                addedLines -= (capend + 1 - cap)
            del document.body[k+1:m-1]
            addedLines -= (m - 1 - (k + 1))
            insertion = '\\begin_inset ERT\nstatus collapsed\n\n' \
                        '\\begin_layout PlainLayout\n\n' + alignment_beg + '\n\\backslash\n' \
                        'subfloat'
            if len(shortcap) > 0:
                insertion = insertion + "[" + shortcap + "]"
            if len(caption) > 0:
                insertion = insertion + "[" + caption + "]"
            insertion = insertion + '{%\n\\end_layout\n\n\\end_inset\n\n\\end_layout\n'
            insertion = insertion.split('\n')
            document.body[k : k + 1] = insertion
            addedLines += len(insertion) - 1
            al = find_token(document.body, '\\align ', k - 1, j + addedLines)
            if al != -1:
                del document.body[al]
                addedLines -= 1
            add_to_preamble(document, ['\\usepackage{subfig}\n'])
        i += addedLines + 1


def revert_wrapplacement(document):
    " Revert placement options wrap floats (wrapfig). "
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Wrap figure", i)
        if i == -1:
            return
        e = find_end_of_inset(document.body, i)
        j = find_token(document.body, "placement", i + 1, e)
        if j == -1:
            document.warning("Malformed LyX document: Couldn't find placement parameter of wrap float.")
            i += 1
            continue
        r = re.compile("placement (o|i|l|r|O|I|L|R)")
        m = r.match(document.body[j])
        if m == None:
            document.warning("Malformed LyX document: Placement option isn't O|I|R|L!")
        else:
            document.body[j] = "placement " + m.group(1).lower()
        i = j


def remove_extra_embedded_files(document):
    " Remove \extra_embedded_files from buffer params "
    i = find_token(document.header, '\\extra_embedded_files', 0)
    if i == -1:
        return
    document.header.pop(i)


def convert_spaceinset(document):
    " Convert '\\InsetSpace foo' to '\\begin_inset Space foo\n\\end_inset' "
    i = 0
    while i < len(document.body):
        m = re.match(r'(.*)\\InsetSpace (.*)', document.body[i])
        if m:
            before = m.group(1)
            after = m.group(2)
            subst = [before, "\\begin_inset Space " + after, "\\end_inset"]
            document.body[i: i+1] = subst
            i = i + len(subst)
        else:
            i = i + 1


def revert_spaceinset(document):
    " Revert '\\begin_inset Space foo\n\\end_inset' to '\\InsetSpace foo' "
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Space", i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of space inset.")
            i += 1
            continue
        document.body[i] = document.body[i].replace('\\begin_inset Space', '\\InsetSpace')
        del document.body[j]


def convert_hfill(document):
    " Convert hfill to space inset "
    i = 0
    while True:
        i = find_token(document.body, "\\hfill", i)
        if i == -1:
            return
        subst = document.body[i].replace('\\hfill', \
                  '\n\\begin_inset Space \\hfill{}\n\\end_inset')
        subst = subst.split('\n')
        document.body[i : i+1] = subst
        i += len(subst)


def revert_hfills(document):
    ' Revert \\hfill commands '
    hfill = re.compile(r'\\hfill')
    dotfill = re.compile(r'\\dotfill')
    hrulefill = re.compile(r'\\hrulefill')
    i = 0
    while True:
        i = find_token(document.body, "\\InsetSpace", i)
        if i == -1:
            return
        if hfill.search(document.body[i]):
            document.body[i] = \
              document.body[i].replace('\\InsetSpace \\hfill{}', '\\hfill')
            i += 1
            continue
        if dotfill.search(document.body[i]):
            subst = document.body[i].replace('\\InsetSpace \\dotfill{}', \
              '\\begin_inset ERT\nstatus collapsed\n\n' \
              '\\begin_layout Standard\n\n\n\\backslash\n' \
              'dotfill{}\n\\end_layout\n\n\\end_inset\n\n')
            subst = subst.split('\n')
            document.body[i : i+1] = subst
            i += len(subst)
            continue
        if hrulefill.search(document.body[i]):
            subst = document.body[i].replace('\\InsetSpace \\hrulefill{}', \
              '\\begin_inset ERT\nstatus collapsed\n\n' \
              '\\begin_layout Standard\n\n\n\\backslash\n' \
              'hrulefill{}\n\\end_layout\n\n\\end_inset\n\n')
            subst = subst.split('\n')
            document.body[i : i+1] = subst
            i += len(subst)
            continue
        i += 1

def revert_hspace(document):
    ' Revert \\InsetSpace \\hspace{} to ERT '
    i = 0
    hspace = re.compile(r'\\hspace{}')
    hstar  = re.compile(r'\\hspace\*{}')
    while True:
        i = find_token(document.body, "\\InsetSpace \\hspace", i)
        if i == -1:
            return
        length = get_value(document.body, '\\length', i+1)
        if length == '':
            document.warning("Malformed lyx document: Missing '\\length' in Space inset.")
            return
        del document.body[i+1]
        addedLines = -1
        if hstar.search(document.body[i]):
            subst = document.body[i].replace('\\InsetSpace \\hspace*{}', \
              '\\begin_inset ERT\nstatus collapsed\n\n' \
              '\\begin_layout Standard\n\n\n\\backslash\n' \
              'hspace*{' + length + '}\n\\end_layout\n\n\\end_inset\n\n')
            subst = subst.split('\n')
            document.body[i : i+1] = subst
            addedLines += len(subst) - 1
            i += addedLines + 1
            continue
        if hspace.search(document.body[i]):
            subst = document.body[i].replace('\\InsetSpace \\hspace{}', \
              '\\begin_inset ERT\nstatus collapsed\n\n' \
              '\\begin_layout Standard\n\n\n\\backslash\n' \
              'hspace{' + length + '}\n\\end_layout\n\n\\end_inset\n\n')
            subst = subst.split('\n')
            document.body[i : i+1] = subst
            addedLines += len(subst) - 1
            i += addedLines + 1
            continue
        i += 1


def revert_protected_hfill(document):
    ' Revert \\begin_inset Space \\hspace*{\\fill} to ERT '
    i = 0
    while True:
        i = find_token(document.body, '\\begin_inset Space \\hspace*{\\fill}', i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of space inset.")
            i += 1
            continue
        del document.body[j]
        subst = document.body[i].replace('\\begin_inset Space \\hspace*{\\fill}', \
          '\\begin_inset ERT\nstatus collapsed\n\n' \
          '\\begin_layout Standard\n\n\n\\backslash\n' \
          'hspace*{\n\\backslash\nfill}\n\\end_layout\n\n\\end_inset\n\n')
        subst = subst.split('\n')
        document.body[i : i+1] = subst
        i += len(subst)


def revert_leftarrowfill(document):
    ' Revert \\begin_inset Space \\leftarrowfill{} to ERT '
    i = 0
    while True:
        i = find_token(document.body, '\\begin_inset Space \\leftarrowfill{}', i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of space inset.")
            i += 1
            continue
        del document.body[j]
        subst = document.body[i].replace('\\begin_inset Space \\leftarrowfill{}', \
          '\\begin_inset ERT\nstatus collapsed\n\n' \
          '\\begin_layout Standard\n\n\n\\backslash\n' \
          'leftarrowfill{}\n\\end_layout\n\n\\end_inset\n\n')
        subst = subst.split('\n')
        document.body[i : i+1] = subst
        i += len(subst)


def revert_rightarrowfill(document):
    ' Revert \\begin_inset Space \\rightarrowfill{} to ERT '
    i = 0
    while True:
        i = find_token(document.body, '\\begin_inset Space \\rightarrowfill{}', i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of space inset.")
            i += 1
            continue
        del document.body[j]
        subst = document.body[i].replace('\\begin_inset Space \\rightarrowfill{}', \
          '\\begin_inset ERT\nstatus collapsed\n\n' \
          '\\begin_layout Standard\n\n\n\\backslash\n' \
          'rightarrowfill{}\n\\end_layout\n\n\\end_inset\n\n')
        subst = subst.split('\n')
        document.body[i : i+1] = subst
        i += len(subst)


def revert_upbracefill(document):
    ' Revert \\begin_inset Space \\upbracefill{} to ERT '
    i = 0
    while True:
        i = find_token(document.body, '\\begin_inset Space \\upbracefill{}', i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of space inset.")
            i += 1
            continue
        del document.body[j]
        subst = document.body[i].replace('\\begin_inset Space \\upbracefill{}', \
          '\\begin_inset ERT\nstatus collapsed\n\n' \
          '\\begin_layout Standard\n\n\n\\backslash\n' \
          'upbracefill{}\n\\end_layout\n\n\\end_inset\n\n')
        subst = subst.split('\n')
        document.body[i : i+1] = subst
        i += len(subst)


def revert_downbracefill(document):
    ' Revert \\begin_inset Space \\downbracefill{} to ERT '
    i = 0
    while True:
        i = find_token(document.body, '\\begin_inset Space \\downbracefill{}', i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of space inset.")
            i += 1
            continue
        del document.body[j]
        subst = document.body[i].replace('\\begin_inset Space \\downbracefill{}', \
          '\\begin_inset ERT\nstatus collapsed\n\n' \
          '\\begin_layout Standard\n\n\n\\backslash\n' \
          'downbracefill{}\n\\end_layout\n\n\\end_inset\n\n')
        subst = subst.split('\n')
        document.body[i : i+1] = subst
        i += len(subst)


def revert_local_layout(document):
    ' Revert local layout headers.'
    i = 0
    while True:
        i = find_token(document.header, "\\begin_local_layout", i)
        if i == -1:
            return
        j = find_end_of(document.header, i, "\\begin_local_layout", "\\end_local_layout")
        if j == -1:
            # this should not happen
            break
        document.header[i : j + 1] = []


def convert_pagebreaks(document):
    ' Convert inline Newpage insets to new format '
    i = 0
    while True:
        i = find_token(document.body, '\\newpage', i)
        if i == -1:
            break
        document.body[i:i+1] = ['\\begin_inset Newpage newpage',
                                '\\end_inset']
    i = 0
    while True:
        i = find_token(document.body, '\\pagebreak', i)
        if i == -1:
            break
        document.body[i:i+1] = ['\\begin_inset Newpage pagebreak',
                                '\\end_inset']
    i = 0
    while True:
        i = find_token(document.body, '\\clearpage', i)
        if i == -1:
            break
        document.body[i:i+1] = ['\\begin_inset Newpage clearpage',
                                '\\end_inset']
    i = 0
    while True:
        i = find_token(document.body, '\\cleardoublepage', i)
        if i == -1:
            break
        document.body[i:i+1] = ['\\begin_inset Newpage cleardoublepage',
                                '\\end_inset']


def revert_pagebreaks(document):
    ' Revert \\begin_inset Newpage to previous inline format '
    i = 0
    while True:
        i = find_token(document.body, '\\begin_inset Newpage', i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of Newpage inset.")
            i += 1
            continue
        del document.body[j]
        document.body[i] = document.body[i].replace('\\begin_inset Newpage newpage', '\\newpage')
        document.body[i] = document.body[i].replace('\\begin_inset Newpage pagebreak', '\\pagebreak')
        document.body[i] = document.body[i].replace('\\begin_inset Newpage clearpage', '\\clearpage')
        document.body[i] = document.body[i].replace('\\begin_inset Newpage cleardoublepage', '\\cleardoublepage')


def convert_linebreaks(document):
    ' Convert inline Newline insets to new format '
    i = 0
    while True:
        i = find_token(document.body, '\\newline', i)
        if i == -1:
            break
        document.body[i:i+1] = ['\\begin_inset Newline newline',
                                '\\end_inset']
    i = 0
    while True:
        i = find_token(document.body, '\\linebreak', i)
        if i == -1:
            break
        document.body[i:i+1] = ['\\begin_inset Newline linebreak',
                                '\\end_inset']


def revert_linebreaks(document):
    ' Revert \\begin_inset Newline to previous inline format '
    i = 0
    while True:
        i = find_token(document.body, '\\begin_inset Newline', i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed LyX document: Could not find end of Newline inset.")
            i += 1
            continue
        del document.body[j]
        document.body[i] = document.body[i].replace('\\begin_inset Newline newline', '\\newline')
        document.body[i] = document.body[i].replace('\\begin_inset Newline linebreak', '\\linebreak')


def convert_japanese_plain(document):
    ' Set language japanese-plain to japanese '
    i = 0
    if document.language == "japanese-plain":
        document.language = "japanese"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language japanese"
    j = 0
    while True:
        j = find_token(document.body, "\\lang japanese-plain", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang japanese-plain", "\\lang japanese")
        j = j + 1


def revert_pdfpages(document):
    ' Revert pdfpages external inset to ERT '
    i = 0
    while 1:
        i = find_token(document.body, "\\begin_inset External", i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed lyx document: Missing '\\end_inset' in revert_pdfpages.")
            i = i + 1
            continue
        if get_value(document.body, 'template', i, j) == "PDFPages":
            filename = get_value(document.body, 'filename', i, j)
            extra = ''
            r = re.compile(r'\textra PDFLaTeX \"(.*)\"$')
            for k in range(i, j):
                m = r.match(document.body[k])
                if m:
                    extra = m.group(1)
            angle = get_value(document.body, 'rotateAngle', i, j)
            width = get_value(document.body, 'width', i, j)
            height = get_value(document.body, 'height', i, j)
            scale = get_value(document.body, 'scale', i, j)
            keepAspectRatio = find_token(document.body, "\tkeepAspectRatio", i, j)
            options = extra
            if angle != '':
                 if options != '':
                     options += ",angle=" + angle
                 else:
                     options += "angle=" + angle
            if width != '':
                 if options != '':
                     options += ",width=" + convert_len(width)
                 else:
                     options += "width=" + convert_len(width)
            if height != '':
                 if options != '':
                     options += ",height=" + convert_len(height)
                 else:
                     options += "height=" + convert_len(height)
            if scale != '':
                 if options != '':
                     options += ",scale=" + scale
                 else:
                     options += "scale=" + scale
            if keepAspectRatio != '':
                 if options != '':
                     options += ",keepaspectratio"
                 else:
                     options += "keepaspectratio"
            if options != '':
                     options = '[' + options + ']'
            del document.body[i+1:j+1]
            document.body[i:i+1] = ['\\begin_inset ERT',
                                'status collapsed',
                                '',
                                '\\begin_layout Standard',
                                '',
                                '\\backslash',
                                'includepdf' + options + '{' + filename + '}',
                                '\\end_layout',
                                '',
                                '\\end_inset']
            add_to_preamble(document, ['\\usepackage{pdfpages}\n'])
            i = i + 1
            continue
        i = i + 1


def revert_mexican(document):
    ' Set language Spanish(Mexico) to Spanish '
    i = 0
    if document.language == "spanish-mexico":
        document.language = "spanish"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language spanish"
    j = 0
    while True:
        j = find_token(document.body, "\\lang spanish-mexico", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang spanish-mexico", "\\lang spanish")
        j = j + 1


def remove_embedding(document):
    ' Remove embed tag from all insets '
    revert_inset_embedding(document, 'Graphics')
    revert_inset_embedding(document, 'External')
    revert_inset_embedding(document, 'CommandInset include')
    revert_inset_embedding(document, 'CommandInset bibtex')


def revert_master(document):
    ' Remove master param '
    i = find_token(document.header, "\\master", 0)
    if i != -1:
        del document.header[i]


def revert_graphics_group(document):
    ' Revert group information from graphics insets '
    i = 0
    while 1:
        i = find_token(document.body, "\\begin_inset Graphics", i)
        if i == -1:
            return
        j = find_end_of_inset(document.body, i)
        if j == -1:
            document.warning("Malformed lyx document: Missing '\\end_inset' in revert_graphics_group.")
            i = i + 1
            continue
        k = find_token(document.body, "	groupId", i, j)
        if k == -1:
            i = i + 1
            continue
        del document.body[k]
        i = i + 1


def update_apa_styles(document):
    ' Replace obsolete styles '

    if document.textclass != "apa":
        return

    obsoletedby = { "Acknowledgments": "Acknowledgements",
                    "Section*":        "Section",
                    "Subsection*":     "Subsection",
                    "Subsubsection*":  "Subsubsection",
                    "Paragraph*":      "Paragraph",
                    "Subparagraph*":   "Subparagraph"}
    i = 0
    while 1:
        i = find_token(document.body, "\\begin_layout", i)
        if i == -1:
            return

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

        i += 1


def convert_paper_sizes(document):
    ' exchange size options legalpaper and executivepaper to correct order '
    # routine is needed to fix http://www.lyx.org/trac/ticket/4868
    i = 0
    j = 0
    i = find_token(document.header, "\\papersize executivepaper", 0)
    if i != -1:
        document.header[i] = "\\papersize legalpaper"
        return
    j = find_token(document.header, "\\papersize legalpaper", 0)
    if j != -1:
        document.header[j] = "\\papersize executivepaper"


def revert_paper_sizes(document):
    ' exchange size options legalpaper and executivepaper to correct order '
    i = 0
    j = 0
    i = find_token(document.header, "\\papersize executivepaper", 0)
    if i != -1:
        document.header[i] = "\\papersize legalpaper"
        return
    j = find_token(document.header, "\\papersize legalpaper", 0)
    if j != -1:
        document.header[j] = "\\papersize executivepaper"


def convert_InsetSpace(document):
    " Convert '\\begin_inset Space foo' to '\\begin_inset space foo'"
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Space", i)
        if i == -1:
            return
        document.body[i] = document.body[i].replace('\\begin_inset Space', '\\begin_inset space')


def revert_InsetSpace(document):
    " Revert '\\begin_inset space foo' to '\\begin_inset Space foo'"
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset space", i)
        if i == -1:
            return
        document.body[i] = document.body[i].replace('\\begin_inset space', '\\begin_inset Space')


def convert_display_enum(document):
    " Convert 'display foo' to 'display false/true'"
    i = 0
    while True:
        i = find_token(document.body, "\tdisplay", i)
        if i == -1:
            return
        val = get_value(document.body, 'display', i)
        if val == "none":
            document.body[i] = document.body[i].replace('none', 'false')
        if val == "default":
            document.body[i] = document.body[i].replace('default', 'true')
        if val == "monochrome":
            document.body[i] = document.body[i].replace('monochrome', 'true')
        if val == "grayscale":
            document.body[i] = document.body[i].replace('grayscale', 'true')
        if val == "color":
            document.body[i] = document.body[i].replace('color', 'true')
        if val == "preview":
            document.body[i] = document.body[i].replace('preview', 'true')
        i += 1


def revert_display_enum(document):
    " Revert 'display false/true' to 'display none/color'"
    i = 0
    while True:
        i = find_token(document.body, "\tdisplay", i)
        if i == -1:
            return
        val = get_value(document.body, 'display', i)
        if val == "false":
            document.body[i] = document.body[i].replace('false', 'none')
        if val == "true":
            document.body[i] = document.body[i].replace('true', 'default')
        i += 1


def remove_fontsCJK(document):
    ' Remove font_cjk param '
    i = find_token(document.header, "\\font_cjk", 0)
    if i != -1:
        del document.header[i]


def convert_plain_layout(document):
    " Convert 'PlainLayout' to 'Plain Layout'"
    i = 0
    while True:
        i = find_token(document.body, '\\begin_layout PlainLayout', i)
        if i == -1:
            return
        document.body[i] = document.body[i].replace('\\begin_layout PlainLayout', \
          '\\begin_layout Plain Layout')
        i += 1


def revert_plain_layout(document):
    " Revert 'Plain Layout' to 'PlainLayout'"
    i = 0
    while True:
        i = find_token(document.body, '\\begin_layout Plain Layout', i)
        if i == -1:
            return
        document.body[i] = document.body[i].replace('\\begin_layout Plain Layout', \
          '\\begin_layout PlainLayout')
        i += 1


def revert_plainlayout(document):
    " Revert 'PlainLayout' to 'Standard'"
    i = 0
    while True:
        i = find_token(document.body, '\\begin_layout PlainLayout', i)
        if i == -1:
            return
        # This will be incorrect for some document classes, since Standard is not always
        # the default. But (a) it is probably the best we can do and (b) it will actually
        # work, in fact, since an unknown layout will be converted to default.
        document.body[i] = document.body[i].replace('\\begin_layout PlainLayout', \
          '\\begin_layout Standard')
        i += 1


def revert_polytonicgreek(document):
    "Set language polytonic Greek to Greek"
    i = 0
    if document.language == "polutonikogreek":
        document.language = "greek"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language greek"
    j = 0
    while True:
        j = find_token(document.body, "\\lang polutonikogreek", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang polutonikogreek", "\\lang greek")
        j = j + 1


def revert_removed_modules(document):
    i = 0
    while True:
        i = find_token(document.header, "\\begin_remove_modules", i)
        if i == -1:
            return
        j = find_end_of(document.header, i, "\\begin_remove_modules", "\\end_remove_modules")
        if j == -1:
            # this should not happen
            break
        document.header[i : j + 1] = []


def add_plain_layout(document):
    i = 0
    while True:
        i = find_token(document.body, "\\begin_layout", i)
        if i == -1:
            return
        if len(document.body[i].split()) == 1:
            document.body[i] = "\\begin_layout Plain Layout"
        i += 1


def revert_tabulators(document):
    "Revert tabulators to 4 spaces"
    i = 0
    while True:
        i = find_token(document.body, "\t", i)
        if i == -1:
            return
        document.body[i] = document.body[i].replace("\t", "    ")
        i += 1


def revert_tabsize(document):
    "Revert the tabsize parameter of listings"
    i = 0
    j = 0
    while True:
        # either it is the only parameter
        i = find_token(document.body, 'lstparams "tabsize=4"', i)
        if i != -1:
            del document.body[i]
        # or the last one
        j = find_token(document.body, "lstparams", j)
        if j == -1:
            return
        pos = document.body[j].find(",tabsize=")
        document.body[j] = document.body[j][:pos] + '"'
        i += 1
        j += 1


def revert_mongolian(document):
    "Set language Mongolian to English"
    i = 0
    if document.language == "mongolian":
        document.language = "english"
        i = find_token(document.header, "\\language", 0)
        if i != -1:
            document.header[i] = "\\language english"
    j = 0
    while True:
        j = find_token(document.body, "\\lang mongolian", j)
        if j == -1:
            return
        document.body[j] = document.body[j].replace("\\lang mongolian", "\\lang english")
        j = j + 1


def revert_default_options(document):
    ' Remove param use_default_options '
    i = find_token(document.header, "\\use_default_options", 0)
    if i != -1:
        del document.header[i]


def convert_default_options(document):
    ' Add param use_default_options and set it to false '
    i = find_token(document.header, "\\textclass", 0)
    if i == -1:
        document.warning("Malformed LyX document: Missing `\\textclass'.")
        return
    document.header.insert(i, '\\use_default_options false')


def revert_backref_options(document):
    ' Revert option pdf_backref=page to pagebackref '
    i = find_token(document.header, "\\pdf_backref page", 0)
    if i != -1:
        document.header[i] = "\\pdf_pagebackref true"


def convert_backref_options(document):
    ' We have changed the option pagebackref to backref=true '
    i = find_token(document.header, "\\pdf_pagebackref true", 0)
    if i != -1:
        document.header[i] = "\\pdf_backref page"
    j = find_token(document.header, "\\pdf_pagebackref false", 0)
    if j != -1:
        del document.header[j]
    # backref=true was not a valid option, we meant backref=section
    k = find_token(document.header, "\\pdf_backref true", 0)
    if k != -1 and i != -1:
        del document.header[k]
    elif k != -1 and j != -1:
        document.header[k] = "\\pdf_backref section"


def convert_charstyle_element(document):
    "Convert CharStyle to Element for docbook backend"
    if document.backend != "docbook":
        return
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Flex CharStyle:", i)
        if i == -1:
            return
        document.body[i] = document.body[i].replace('\\begin_inset Flex CharStyle:',
                                                    '\\begin_inset Flex Element:')

def revert_charstyle_element(document):
    "Convert Element to CharStyle for docbook backend"
    if document.backend != "docbook":
        return
    i = 0
    while True:
        i = find_token(document.body, "\\begin_inset Flex Element:", i)
        if i == -1:
            return
        document.body[i] = document.body[i].replace('\\begin_inset Flex Element:',
                                                    '\\begin_inset Flex CharStyle:')

##
# Conversion hub
#

supported_versions = ["1.6.0","1.6"]
convert = [[277, [fix_wrong_tables]],
           [278, [close_begin_deeper]],
           [279, [long_charstyle_names]],
           [280, [axe_show_label]],
           [281, []],
           [282, []],
           [283, [convert_flex]],
           [284, []],
           [285, []],
           [286, []],
           [287, [convert_wrapfig_options]],
           [288, [convert_inset_command]],
           [289, [convert_latexcommand_index]],
           [290, []],
           [291, []],
           [292, [convert_japanese_cjk]],
           [293, []],
           [294, [convert_pdf_options]],
           [295, [convert_htmlurl, convert_url]],
           [296, [convert_include]],
           [297, [convert_usorbian]],
           [298, [convert_macro_global]],
           [299, []],
           [300, []],
           [301, []],
           [302, []],
           [303, [convert_serbocroatian]],
           [304, [convert_framed_notes]],
           [305, []],
           [306, []],
           [307, []],
           [308, []],
           [309, []],
           [310, []],
           [311, [convert_ams_classes]],
           [312, []],
           [313, [convert_module_names]],
           [314, []],
           [315, []],
           [316, [convert_subfig]],
           [317, []],
           [318, []],
           [319, [convert_spaceinset, convert_hfill]],
           [320, []],
           [321, [convert_tablines]],
           [322, [convert_plain_layout]],
           [323, [convert_pagebreaks]],
           [324, [convert_linebreaks]],
           [325, [convert_japanese_plain]],
           [326, []],
           [327, []],
           [328, [remove_embedding, remove_extra_embedded_files, remove_inzip_options]],
           [329, []],
           [330, []],
           [331, [convert_ltcaption]],
           [332, []],
           [333, [update_apa_styles]],
           [334, [convert_paper_sizes]],
           [335, [convert_InsetSpace]],
           [336, []],
           [337, [convert_display_enum]],
           [338, []],
           [339, []],
           [340, [add_plain_layout]],
           [341, []],
           [342, []],
           [343, [convert_default_options]],
           [344, [convert_backref_options]],
           [345, [convert_charstyle_element]]
          ]

revert =  [[344, [revert_charstyle_element]],
           [343, [revert_backref_options]],
           [342, [revert_default_options]],
           [341, [revert_mongolian]],
           [340, [revert_tabulators, revert_tabsize]],
           [339, []],
           [338, [revert_removed_modules]],
           [337, [revert_polytonicgreek]],
           [336, [revert_display_enum]],
           [335, [remove_fontsCJK]],
           [334, [revert_InsetSpace]],
           [333, [revert_paper_sizes]],
           [332, []],
           [331, [revert_graphics_group]],
           [330, [revert_ltcaption]],
           [329, [revert_leftarrowfill, revert_rightarrowfill, revert_upbracefill, revert_downbracefill]],
           [328, [revert_master]],
           [327, []],
           [326, [revert_mexican]],
           [325, [revert_pdfpages]],
           [324, []],
           [323, [revert_linebreaks]],
           [322, [revert_pagebreaks]],
           [321, [revert_local_layout, revert_plain_layout]],
           [320, [revert_tablines]],
           [319, [revert_protected_hfill]],
           [318, [revert_spaceinset, revert_hfills, revert_hspace]],
           [317, [remove_extra_embedded_files]],
           [316, [revert_wrapplacement]],
           [315, [revert_subfig]],
           [314, [revert_colsep, revert_plainlayout]],
           [313, []],
           [312, [revert_module_names]],
           [311, [revert_rotfloat, revert_widesideways]],
           [310, [revert_external_embedding]],
           [309, [revert_btprintall]],
           [308, [revert_nocite]],
           [307, [revert_serbianlatin]],
           [306, [revert_slash, revert_nobreakdash]],
           [305, [revert_interlingua]],
           [304, [revert_bahasam]],
           [303, [revert_framed_notes]],
           [302, []],
           [301, [revert_latin, revert_samin]],
           [300, [revert_linebreak]],
           [299, [revert_pagebreak]],
           [298, [revert_hyperlinktype]],
           [297, [revert_macro_optional_params]],
           [296, [revert_albanian, revert_lowersorbian, revert_uppersorbian]],
           [295, [revert_include]],
           [294, [revert_href, revert_url]],
           [293, [revert_pdf_options_2]],
           [292, [revert_inset_info]],
           [291, [revert_japanese, revert_japanese_encoding, revert_japanese_cjk]],
           [290, [revert_vietnamese]],
           [289, [revert_wraptable]],
           [288, [revert_latexcommand_index]],
           [287, [revert_inset_command]],
           [286, [revert_wrapfig_options]],
           [285, [revert_pdf_options]],
           [284, [remove_inzip_options]],
           [283, []],
           [282, [revert_flex]],
           [281, []],
           [280, [revert_begin_modules]],
           [279, [revert_show_label]],
           [278, [revert_long_charstyle_names]],
           [277, []],
           [276, []]
          ]


if __name__ == "__main__":
    pass