--[[
This file is part of the `arabluatex' package

ArabLuaTeX -- Processing ArabTeX notation under LuaLaTeX
Copyright (C) 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023
Robert Alessi <alessi@robertalessi.net>

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Please send error reports and suggestions for improvements to Robert
Alessi <alessi@robertalessi.net>
--]]

arabluatex = {}

require("arabluatex_voc")
require("arabluatex_fullvoc")
require("arabluatex_novoc")
require("arabluatex_trans")

-- lpeg equivalent for string.gsub()
local function gsub(s, patt, repl)
  patt = lpeg.P(patt)
  patt = lpeg.Cs((patt / repl + 1)^0)
  return lpeg.match(patt, s)
end

-- makeatletter, makeatother
local atletter = "\\makeatletter{}"
local atother = "\\makeatother{}"

-- some basic patterns:
local ascii = lpeg.R("az", "AZ", "@@")
local dblbkslash = lpeg.Cs("\\")
local bsqbrackets = lpeg.Cs{ "[" * ((1 - lpeg.S"[]") + lpeg.V(1))^0 * "]" }
local bcbraces = lpeg.Cs{ "{" * ((1 - lpeg.S"{}") + lpeg.V(1))^0 * "}" }
local spce = lpeg.Cs(" ")
local spcenc = lpeg.P(" ")
local cmdstar = lpeg.Cs(spce * lpeg.P("*"))
local bsqbracketsii = lpeg.Cs(bsqbrackets^-2)
local bcbracesii = lpeg.Cs(bcbraces^-2)
local cmd = lpeg.Cs(dblbkslash * ascii^1 * cmdstar^-1)
local rawcmd = lpeg.Cs(dblbkslash * ascii^1)
local aftercmd = lpeg.Cs(lpeg.S("*[{,.?;:'`\"") + dblbkslash)
local cmdargs = lpeg.Cs(spce^-1 * bsqbracketsii * bcbracesii * bsqbrackets^-1)
local cmdargsnobs = lpeg.Cs(spce^-1 * bcbracesii)
local arbargs = lpeg.Cs(spce^-1 * bsqbrackets^-1 * bcbraces)
local baytargs = lpeg.Cs(spce * bcbraces * bsqbrackets^-1 * bcbraces)
local arind = lpeg.Cs(dblbkslash * lpeg.P("arind") * spce^-1 * bsqbracketsii)

local function protectarb(str)
   -- \App[]{}{}
   str = string.gsub(str, "(\\App%s?)(%b{})(%b{})", "%1[]%2%3")
   str = gsub(str, lpeg.P("\\App") * spcenc^-1 * bsqbrackets * bcbraces * bcbraces,
	      function(opt, lem, rdg)
		 opt = string.sub(opt, 2, -2)
		 lem = string.sub(lem, 2, -2)
		 rdg = string.sub(rdg, 2, -2)
		 if opt == ""
		 then
		    return string.format("\\app{%s%s}", lem, rdg)
		 else
		    return string.format("\\app[%s]{%s%s}", opt, lem, rdg)
		 end
   end)
   str = string.gsub(str, "(\\arb%s?)(%[.-%])(%b{})", "\\al@brk{\\arb%2%3}")
   str = string.gsub(str, "(\\LR%s?)(%b{})", "\\@LR%2")
   str = string.gsub(str, "(\\RL%s?)(%b{})", "\\@RL%2")
   return str
end

local function unprotectarb(str)
   str = string.gsub(str, "(\\@arb)(%[.-%])(%b{})", "\\arb%2%3")
   str = string.gsub(str, "(\\@LR)(%b{})", "\\LR%2")
   str = string.gsub(str, "(\\@RL)(%b{})", "\\RL%2")
   str = gsub(str, lpeg.Cs("\\al@brk") * bcbraces, function(tag, body)
		 body = string.sub(body, 2, -2)
		 return string.format("%s", body)
   end)
   return str
end

-- the following is to be taken out of \arb{}
local outofarb = {
   "LRfootnote",
   "RLfootnote",
   "edtext",
   "pstart",
   "pend"
}
-- commands the arguments of which must not be processed by arabluatex
-- inside \arb{}.  'albrkcmds' is what is set by default.  'brkcmds'
-- collects the commands set in the preamble with \MkArbBreak{}
local albrkcmds = {
   "begin",
   "end",
   "LRmarginpar",
   "arbmark",
   "abjad",
   "ayah",
   "SetArbNumbers"
}
local brkcmds = {}

function arabluatex.mkarbbreak(str, opt)
   str = str ..","
   str = string.gsub(str, "%s+", "")
   local fieldstart = 1
   if opt == "dflt" then
      repeat
	 local nexti = string.find(str, "%,", fieldstart)
	 table.insert(brkcmds, string.sub(str, fieldstart, nexti-1))
	 fieldstart = nexti +1
      until fieldstart > string.len(str)
      return brkcmds
   elseif opt == "out" then
      repeat
	 local nexti = string.find(str, "%,", fieldstart)
	 table.insert(outofarb, string.sub(str, fieldstart, nexti-1))
	 fieldstart = nexti +1
      until fieldstart > string.len(str)
      return outofarb
   end
end

local function breakcmd(str)
   -- \par
   str = gsub(str, dblbkslash * lpeg.Cs("par") * cmdargsnobs, "\\al@brk{%1%2%3}")
   -- process \item[], then \item[]
   str = string.gsub(str, "\\(item.?)(%b[])",
		     function(tag, body)
			body = string.sub(body, 2, -2)
			return string.format("\\al@brk{\\item[\\arb{%s}] }", body)
   end)
   str = string.gsub(str, "(\\item)(%s+)", "%1{}%2")
   -- \textcolor
	str = string.gsub(str, "\\(textcolor%s?)(%b{})(%b{})",
			  function(tag, bodycolor, bodytext)
			     bodycolor = string.sub(bodycolor, 2, -2)
			     bodytext = string.sub(bodytext, 2, -2)
			     return string.format("\\al@brk{\\%s{%s}{\\arb{%s}}}", tag, bodycolor, bodytext)
	end)
   -- commands set by default in outofarb
   for i = 1,#outofarb do
      str = gsub(str, dblbkslash * lpeg.Cs(outofarb[i]) * cmdargs, "}%1%2%3\\arb{")
   end
   -- commands set by default in albrkcmds
   for i = 1,#albrkcmds do
      str = gsub(str, dblbkslash * lpeg.Cs(albrkcmds[i]) * cmdargs, "\\al@brk{%1%2%3}")
   end
   -- user commands (brkcmds)
   if next(brkcmds) == nil then
      -- nothing to do
   else
      for i = 1,#brkcmds do
	 str = gsub(str, dblbkslash * lpeg.Cs(brkcmds[i]) * cmdargs, "\\al@brk{%1%2%3}")
      end
   end
   return str
end

local function holdcmd(str)
   str = gsub(str, lpeg.Cs("\\arb") * bcbraces, function(tag, body)
	body = string.sub(body, 2, -2)
	body = gsub(body, cmd * spcenc^-1 * bsqbracketsii * spcenc^-1 * bcbraces, function(btag, bopt, bbody)
	bbody = string.sub(bbody, 2, -2)
	if string.find(btag, "@") then
	   return holdcmd(string.format("}%s%s{%s}\\arb{", btag, bopt, bbody))
	else
	   return holdcmd(string.format("}%s%s{\\arb{%s}}\\arb{", btag, bopt, bbody))
	end
	end)
	return string.format("%s{%s}", tag, body)
   end)
   str = string.gsub(str, "\\arb{}", "")
   return str
end

local indorarbnum = "Indian"

function arabluatex.setnums(opt)
   if opt == "Indian"
   then
      indorarbnum = "Indian"
   else
      indorarbnum = "Arabic"
   end
end

local function arbnum(str) -- not used, see below
   str = string.gsub(str, "([0-9%,%-%/]+)", function(num)
	return string.reverse(num)
   end)
   return str
end

local function indnum(str, dir)
   if dir == "ltr"
   then
      -- do nothing
   else
      str = string.gsub(str, "([0-9%,%-%/]+)", function(num)
			   return string.reverse(num)
      end)
   end
   if indorarbnum == "Indian"
   then
      for i = 1,#numbers do
	 str = string.gsub(str, numbers[i].a, numbers[i].b)
      end
   end
   return str
end

local function processdiscretionary(str)
   str = string.gsub(str, "\\%-", "\\-{}")
   return str
end

local function processarbnull(str, scheme)
   if scheme == "buckwalter" then
      str = string.gsub(str, "(\\arbnull.?)(%b{})", function(tag, body)
			   body = string.sub(body, 2, -2)
			   return string.format("P%sP", body)
      end)
   else
      str = string.gsub(str, "(\\arbnull.?)(%b{})", function(tag, body)
			   body = string.sub(body, 2, -2)
			   return string.format("O%sO", body)
      end)
   end
   return str
end

local function takeout_abjad_ayah(str)
   str = string.gsub(str, "(\\abjad.?)(%b{})", function(tag, body)
			body = string.sub(body, 2, -2)
			return string.format("%s", body)
   end)
   str = string.gsub(str, "(\\ayah.?)(%b{})", function(tag, body)
			body = string.sub(body, 2, -2)
			if tonumber(body) ~= nil and str.len(body) < 4 then
			   return string.format("(%s)", body)
			else
			   return "<??>"
			end
   end)
   return str
end

local function takeoutcapetc(str)
   str = string.gsub(str, "(\\arb.?%[trans%])(%b{})", function(tag, body)
			body = string.sub(body, 2, -2)
			body = string.gsub(body, "(\\uc%s?)(%b{})", "\\Uc%2")
			return string.format("%s{%s}", tag, body)
   end)
   str = string.gsub(str, "(\\arbup.?)(%b{})", function(tag, body)
			body = string.sub(body, 2, -2)
			return string.format("%s", body)
   end)
   str = string.gsub(str, "(\\uc%s?)(%b{})", function(tag, body)
			body = string.sub(body, 2, -2)
			return string.format("%s", body)
   end)
   str = string.gsub(str, "\\uc%s", "")
   str = string.gsub(str, "\\linebreak", "")
   str = string.gsub(str, "\\%-", "")
   return str
end

local function checkwrnested(str)
   for i = 1,#outofarb do
      str = gsub(str, dblbkslash * lpeg.Cs(lpeg.P("LR") + lpeg.P("RL")) * cmdargs,
		 function(prefix, tag, body)
		    body = string.sub(body, 2, -2)
		    if string.find(body, "\\"..outofarb[i]) then
		       return atletter.."\\al@wrong@nesting{}"..atother
		    else
		       -- nothing to do, so proceed.
		    end
      end)
   end
   return str
end

local function takeoutarb(str)
   str = checkwrnested(str)
   for i = 1,#outofarb do
      str = gsub(str, dblbkslash * lpeg.Cs(outofarb[i]) * cmdargs,
   		 function(prefix, tag, body)
   		    body = gsub(body, lpeg.P("\\arb"), "\\@rb")
   		    return string.format("%s%s%s", prefix, tag, body)
      end)
   end
   str = string.gsub(str, "(\\arb%s?)(%b{})", function(tag, body)
   			body = string.sub(body, 2, -2)
			return string.format("\\al@brk{%s{%s}}", tag, body)
   end)
   str = string.gsub(str, "\\@rb", "\\arb")
   str = "\\arb{"..str.."}"
   return str
end

-- I owe this function to M. Krüger and U. Fischer. Thank to them both.
local function getrenderer()
   local a = nil
   if font.getfont(font.current()).specification
   then
      a=font.getfont(font.current()).specification.features.normal.mode
   end
   return a
end

local function voc(str, rules)
   str = string.gsub(str, "\\arb(%b{})", function(inside)
   inside = string.sub(inside, 2, -2)
   for i = 1,#hamza do
      inside = string.gsub(inside, hamza[i].a, hamza[i].b)
   end
   if rules == "idgham" then
      for i = 1,#tanwin do
	 inside  = string.gsub(inside, tanwin[i].a, tanwin[i].b)
      end
   else
      for i = 1,#tanwineasy do
	 inside  = string.gsub(inside, tanwineasy[i].a, tanwineasy[i].b)
      end
   end
   for i = 1,#trigraphs do
      inside = string.gsub(inside, trigraphs[i].a, trigraphs[i].b)
   end
   if rules == "idgham" then
      for i = 1,#idgham do
	 inside = string.gsub(inside, idgham[i].a, idgham[i].b)
      end
   end
   for i = 1,#digraphs do
      inside = string.gsub(inside, digraphs[i].a, digraphs[i].b)
   end
   for i = 1,#single do
      inside = string.gsub(inside, single[i].a, single[i].b)
   end
   for i = 1,#longv do
      inside = string.gsub(inside, longv[i].a, longv[i].b)
   end
   for i = 1,#shortv do
      inside = string.gsub(inside, shortv[i].a, shortv[i].b)
   end
   if getrenderer() == "harf"
   then
      for i = 1,#punctuationhb do
	 inside = string.gsub(inside, punctuationhb[i].a,
			      punctuationhb[i].b)
      end
   else
      for i = 1,#punctuation do
	 inside = string.gsub(inside, punctuation[i].a, punctuation[i].b)
      end
   end
   for i = 1,#null do
      inside = string.gsub(inside, null[i].a, null[i].b)
   end
   inside = indnum(inside)
   return string.format("\\arabicfont{}%s", inside)
   end)
return str
end

local function voceasy(str)
   str = string.gsub(str, "\\arb(%b{})", function(inside)
   inside = string.sub(inside, 2, -2)
   for i = 1,#hamzaeasy do
      inside = string.gsub(inside, hamzaeasy[i].a, hamzaeasy[i].b)
   end
   for i = 1,#tanwineasy do
      inside  = string.gsub(inside, tanwineasy[i].a, tanwineasy[i].b)
   end
   for i = 1,#trigraphseasy do
      inside = string.gsub(inside, trigraphseasy[i].a, trigraphseasy[i].b)
   end
   for i = 1,#digraphs do
      inside = string.gsub(inside, digraphs[i].a, digraphs[i].b)
   end
   for i = 1,#single do
      inside = string.gsub(inside, single[i].a, single[i].b)
   end
   for i = 1,#longv do
      inside = string.gsub(inside, longv[i].a, longv[i].b)
   end
   for i = 1,#shortv do
      inside = string.gsub(inside, shortv[i].a, shortv[i].b)
   end
   if getrenderer() == "harf"
   then
      for i = 1,#punctuationhb do
	 inside = string.gsub(inside, punctuationhb[i].a,
			      punctuationhb[i].b)
      end
   else
      for i = 1,#punctuation do
	 inside = string.gsub(inside, punctuation[i].a, punctuation[i].b)
      end
   end
   for i = 1,#null do
      inside = string.gsub(inside, null[i].a, null[i].b)
   end
   inside = indnum(inside)
   return string.format("\\arabicfont{}%s", inside)
   end)
return str
end

local function fullvoc(str, rules)
   str = string.gsub(str, "\\arb(%b{})", function(inside)
   inside = string.sub(inside, 2, -2)
   for i = 1,#hamzafv do
      inside = string.gsub(inside, hamzafv[i].a, hamzafv[i].b)
   end
   if rules == "idgham" then
      for i = 1,#tanwinfv do
	 inside  = string.gsub(inside, tanwinfv[i].a, tanwinfv[i].b)
      end
   else
      for i = 1,#tanwinfveasy do
	 inside  = string.gsub(inside, tanwinfveasy[i].a, tanwinfveasy[i].b)
      end
   end
   for i = 1,#trigraphsfv do
      inside = string.gsub(inside, trigraphsfv[i].a, trigraphsfv[i].b)
   end
   if rules == "idgham" then
      for i = 1,#idgham do
	 inside = string.gsub(inside, idgham[i].a, idgham[i].b)
      end
   end
   if rules == "idgham" then
      for i = 1,#digraphsfvidgham do
	 inside = string.gsub(inside, digraphsfvidgham[i].a, digraphsfvidgham[i].b)
      end
   else
      for i = 1,#digraphsfv do
	 inside = string.gsub(inside, digraphsfv[i].a, digraphsfv[i].b)
      end
   end
   for i = 1,#singlefv do
      inside = string.gsub(inside, singlefv[i].a, singlefv[i].b)
   end
   for i = 1,#longv do
      inside = string.gsub(inside, longv[i].a, longv[i].b)
   end
   for i = 1,#shortv do
      inside = string.gsub(inside, shortv[i].a, shortv[i].b)
   end
   if getrenderer() == "harf"
   then
      for i = 1,#punctuationhb do
	 inside = string.gsub(inside, punctuationhb[i].a,
			      punctuationhb[i].b)
      end
   else
      for i = 1,#punctuation do
	 inside = string.gsub(inside, punctuation[i].a, punctuation[i].b)
      end
   end
   for i = 1,#null do
      inside = string.gsub(inside, null[i].a, null[i].b)
   end
   inside = indnum(inside)
   return string.format("\\arabicfont{}%s", inside)
   end)
return str
end

local function fullvoceasy(str, rules)
   str = string.gsub(str, "\\arb(%b{})", function(inside)
   inside = string.sub(inside, 2, -2)
   for i = 1,#hamzafveasy do
      inside = string.gsub(inside, hamzafveasy[i].a, hamzafveasy[i].b)
   end
   for i = 1,#tanwinfveasy do
      inside  = string.gsub(inside, tanwinfveasy[i].a, tanwinfveasy[i].b)
   end
   for i = 1,#trigraphsfveasy do
      inside = string.gsub(inside, trigraphsfveasy[i].a, trigraphsfveasy[i].b)
   end
   if rules == "nosukun" then
      for i = 1,#digraphsfveasy do
	 inside = string.gsub(inside, digraphsfveasy[i].a, digraphsfveasy[i].b)
      end
   else
      for i = 1,#digraphsfv do
	 inside = string.gsub(inside, digraphsfv[i].a, digraphsfv[i].b)
      end
   end
   if rules == "nosukun" then
      for i = 1,#singlefveasy do
	 inside = string.gsub(inside, singlefveasy[i].a, singlefveasy[i].b)
      end
   else
      for i = 1,#singlefv do
	 inside = string.gsub(inside, singlefv[i].a, singlefv[i].b)
      end
   end
   for i = 1,#longv do
      inside = string.gsub(inside, longv[i].a, longv[i].b)
   end
   for i = 1,#shortv do
      inside = string.gsub(inside, shortv[i].a, shortv[i].b)
   end
   if getrenderer() == "harf"
   then
      for i = 1,#punctuationhb do
	 inside = string.gsub(inside, punctuationhb[i].a,
			      punctuationhb[i].b)
      end
   else
      for i = 1,#punctuation do
	 inside = string.gsub(inside, punctuation[i].a, punctuation[i].b)
      end
   end
   for i = 1,#null do
      inside = string.gsub(inside, null[i].a, null[i].b)
   end
   inside = indnum(inside)
   return string.format("\\arabicfont{}%s", inside)
   end)
return str
end

local function novoc(str)
   str = string.gsub(str, "\\arb(%b{})", function(inside)
   inside = string.sub(inside, 2, -2)
   for i = 1,#hamza do
      inside = string.gsub(inside, hamza[i].a, hamza[i].b)
   end
   for i = 1,#tanwinnv do
      inside  = string.gsub(inside, tanwinnv[i].a, tanwinnv[i].b)
   end
   for i = 1,#trigraphsnv do
      inside = string.gsub(inside, trigraphsnv[i].a, trigraphsnv[i].b)
   end
   for i = 1,#digraphs do
      inside = string.gsub(inside, digraphs[i].a, digraphs[i].b)
   end
   for i = 1,#single do
      inside = string.gsub(inside, single[i].a, single[i].b)
   end
   for i = 1,#longvnv do
      inside = string.gsub(inside, longvnv[i].a, longvnv[i].b)
   end
   for i = 1,#shortvnv do
      inside = string.gsub(inside, shortvnv[i].a, shortvnv[i].b)
   end
   if getrenderer() == "harf"
   then
      for i = 1,#punctuationhb do
	 inside = string.gsub(inside, punctuationhb[i].a,
			      punctuationhb[i].b)
      end
   else
      for i = 1,#punctuation do
	 inside = string.gsub(inside, punctuation[i].a, punctuation[i].b)
      end
   end
   for i = 1,#null do
      inside = string.gsub(inside, null[i].a, null[i].b)
   end
   inside = indnum(inside)
   return string.format("\\arabicfont{}%s", inside)
   end)
   return str
end

local function novoceasy(str)
   str = string.gsub(str, "\\arb(%b{})", function(inside)
   inside = string.sub(inside, 2, -2)
   for i = 1,#hamzaeasy do
      inside = string.gsub(inside, hamzaeasy[i].a, hamzaeasy[i].b)
   end
   for i = 1,#tanwinnv do
      inside  = string.gsub(inside, tanwinnv[i].a, tanwinnv[i].b)
   end
   for i = 1,#trigraphsnv do
      inside = string.gsub(inside, trigraphsnv[i].a, trigraphsnv[i].b)
   end
   for i = 1,#digraphs do
      inside = string.gsub(inside, digraphs[i].a, digraphs[i].b)
   end
   for i = 1,#single do
      inside = string.gsub(inside, single[i].a, single[i].b)
   end
   for i = 1,#longvnv do
      inside = string.gsub(inside, longvnv[i].a, longvnv[i].b)
   end
   for i = 1,#shortvnv do
      inside = string.gsub(inside, shortvnv[i].a, shortvnv[i].b)
   end
   if getrenderer() == "harf"
   then
      for i = 1,#punctuationhb do
	 inside = string.gsub(inside, punctuationhb[i].a,
			      punctuationhb[i].b)
      end
   else
      for i = 1,#punctuation do
	 inside = string.gsub(inside, punctuation[i].a, punctuation[i].b)
      end
   end
   for i = 1,#null do
      inside = string.gsub(inside, null[i].a, null[i].b)
   end
   inside = indnum(inside)
   return string.format("\\arabicfont{}%s", inside)
   end)
   return str
end

local function transdmg(str, mode, rules)
   str = string.gsub(str, "\\arb(%b{})", function(inside)
   inside = string.sub(inside, 2, -2)
   if mode == "dmg"
   then
      for i = 1,#hamzatrnoinitialdmg do
	 inside = string.gsub(inside, hamzatrnoinitialdmg[i].a, hamzatrnoinitialdmg[i].b)
      end
   elseif mode == "dmg+"
   then
      for i = 1,#hamzatrdmg do
	 inside = string.gsub(inside, hamzatrdmg[i].a, hamzatrdmg[i].b)
      end
   end
   for i = 1,#tanwintrdmg do
      inside  = string.gsub(inside, tanwintrdmg[i].a, tanwintrdmg[i].b)
   end
   for i = 1,#trigraphstrdmg do
      inside = string.gsub(inside, trigraphstrdmg[i].a, trigraphstrdmg[i].b)
   end
   if rules == "idgham" then
      for i = 1,#idghamtrdmg do
	 inside = string.gsub(inside, idghamtrdmg[i].a, idghamtrdmg[i].b)
      end
   end
   for i = 1,#digraphstrdmg do
      inside = string.gsub(inside, digraphstrdmg[i].a, digraphstrdmg[i].b)
   end
   for i = 1,#singletrdmg do
      inside = string.gsub(inside, singletrdmg[i].a, singletrdmg[i].b)
   end
   for i = 1,#longvtrdmg do
      inside = string.gsub(inside, longvtrdmg[i].a, longvtrdmg[i].b)
   end
   for i = 1,#shortvtrdmg do
      inside = string.gsub(inside, shortvtrdmg[i].a, shortvtrdmg[i].b)
   end
   for i = 1,#punctuationtr do
      inside = string.gsub(inside, punctuationtr[i].a, punctuationtr[i].b)
   end
   for i = 1,#nulltr do
      inside = string.gsub(inside, nulltr[i].a, nulltr[i].b)
   end
   return string.format("\\altrfont{}%s", inside)
   end)
   return str
end

local function transloc(str)
   str = string.gsub(str, "\\arb(%b{})", function(inside)
   inside = string.sub(inside, 2, -2)
   for i = 1,#hamzatrloc do
      inside = string.gsub(inside, hamzatrloc[i].a, hamzatrloc[i].b)
   end
   for i = 1,#tanwintrloc do
      inside  = string.gsub(inside, tanwintrloc[i].a, tanwintrloc[i].b)
   end
   for i = 1,#trigraphstrloc do
      inside = string.gsub(inside, trigraphstrloc[i].a, trigraphstrloc[i].b)
   end
   for i = 1,#digraphstrloc do
      inside = string.gsub(inside, digraphstrloc[i].a, digraphstrloc[i].b)
   end
   for i = 1,#singletrloc do
      inside = string.gsub(inside, singletrloc[i].a, singletrloc[i].b)
   end
   for i = 1,#longvtrloc do
      inside = string.gsub(inside, longvtrloc[i].a, longvtrloc[i].b)
   end
   for i = 1,#shortvtrloc do
      inside = string.gsub(inside, shortvtrloc[i].a, shortvtrloc[i].b)
   end
   for i = 1,#finaltrloc do
      inside = string.gsub(inside, finaltrloc[i].a, finaltrloc[i].b)
   end
   for i = 1,#punctuationtr do
      inside = string.gsub(inside, punctuationtr[i].a, punctuationtr[i].b)
   end
   for i = 1,#nulltr do
      inside = string.gsub(inside, nulltr[i].a, nulltr[i].b)
   end
   return string.format("\\altrfont{}%s", inside)
   end)
   return str
end

local function transarabica(str)
   str = string.gsub(str, "\\arb(%b{})", function(inside)
   inside = string.sub(inside, 2, -2)
   for i = 1,#hamzatrarabica do
      inside = string.gsub(inside, hamzatrarabica[i].a, hamzatrarabica[i].b)
   end
   for i = 1,#tanwintrloc do
      inside  = string.gsub(inside, tanwintrloc[i].a, tanwintrloc[i].b)
   end
   for i = 1,#trigraphstrarabica do
      inside = string.gsub(inside, trigraphstrarabica[i].a, trigraphstrarabica[i].b)
   end
   for i = 1,#digraphstrarabica do
      inside = string.gsub(inside, digraphstrarabica[i].a, digraphstrarabica[i].b)
   end
   for i = 1,#singletrarabica do
      inside = string.gsub(inside, singletrarabica[i].a, singletrarabica[i].b)
   end
   for i = 1,#longvtrarabica do
      inside = string.gsub(inside, longvtrarabica[i].a, longvtrarabica[i].b)
   end
   for i = 1,#shortvtrloc do
      inside = string.gsub(inside, shortvtrloc[i].a, shortvtrloc[i].b)
   end
   for i = 1,#punctuationtr do
      inside = string.gsub(inside, punctuationtr[i].a, punctuationtr[i].b)
   end
   for i = 1,#nulltr do
      inside = string.gsub(inside, nulltr[i].a, nulltr[i].b)
   end
   return string.format("\\altrfont{}%s", inside)
   end)
   return str
end

local function processbuckw(str)
   str = string.gsub(str, "\\arb(%b{})", function(inside)
   inside = string.sub(inside, 2, -2)
   for i = 1,#buckwalter do
      inside = string.gsub(inside, buckwalter[i].a, buckwalter[i].b)
   end
   return string.format("\\arb{%s}", inside)
   end)
   return str
end

local function processarind(str, mode)
   str = gsub(str, arind * bcbraces, function(tag, arg)
		 arg = string.sub(arg, 2, -2)
		 if mode == "trans" then
		    return string.format("%s{%s@\\txtrans{%s}}", tag, arg, arg)
		 else
		    arg = novoc(arg)
		    arg = string.gsub(arg, "\\arabicfont%s?{}", "")
		    return string.format("%s{%s@\\txarb{%s}}", tag, arg, arg)
		 end
   end)
   return str
end

-- The following functions produce a copy of the original .tex source
-- file in which all arabtex strings are replaced with Unicode
-- equivalents
local utffilesuffix = "_out"
local export_utf = "no"

function arabluatex.utffilesuffix(str)
   utffilesuffix = str
   return true
end

function arabluatex.doexport(str)
   export_utf = str
   return true
end

function arabluatex.openstream()
   local f = io.open(tex.jobname..utffilesuffix.."_tmp.tex", "a+")
   local preamble = io.open(tex.jobname..".tex", "r")
   for line in preamble:lines() do
      f:write(line, "\n")
      if string.find(line, "^%s-\\begin%s?{document}") then
	 break
      end
   end
   preamble:close()
   f:close()
   return true
end

local function processarbtoutf(str)
   if export_utf ~= "arabverse" then
      str = "\\begin{arabexport}"..str
   else end
   --[[ -- of no use, see above takeout_abjad_ayah()
   str = string.gsub(str, "(\\txtrans%s?)(%b{})", function(tag, body)
			body = string.sub(body, 2, -2)
			body = string.gsub(body, "(\\abjad%s?)(%b{})", function(btag, bbody)
					      bbody = string.sub(bbody, 2, -2)
					      return string.format("%s", bbody)
			end)
			body = string.gsub(body, "(\\ayah%s?)(%b{})", function(btag, bbody)
					      bbody = string.sub(bbody, 2, -2)
					      return string.format("(%s)", bbody)
			end)
			return string.format("%s{%s}", tag, body)
   end)
   --]]
   str = string.gsub(str, "(\\txarb%s?)(%b{})", function(tag, body)
			body = string.sub(body, 2, -2)
			body = string.gsub(body, "(\\abjad%s?)(%b{})", function(btag, bbody)
					      bbody = string.sub(bbody, 2, -2)
					      if tonumber(bbody) ~= nil then
						 bbody = arabluatex.abjadify(bbody)
						 return string.format("\\aoline*{\\arb[novoc]{%s}}", bbody)
					      else
						 return string.format("%s{%s}", btag, bbody)
					      end
			end)
			body = string.gsub(body, "(\\arbmark%s?)(%b{})", function(btag, bbody)
					      bbody = string.sub(bbody, 2, -2)
					      return string.format("%s[rl]{%s}", btag, bbody)
			end)
			body = string.gsub(body, "(\\ayah%s?)(%b{})", function(btag, bbody)
					      bbody = string.sub(bbody, 2, -2)
					      return string.format("\\arb[novoc]{%s^^^^06dd}", bbody)
			end)
			return string.format("%s{%s}", tag, body)
   end)
   str = string.gsub(str, "(\\bayt)%s?(%+?)(%b{})(%b[])(%b{})", function(tag, plus, argi, argii, argiii)
   			argi = string.sub(argi, 2, -2)
   			argii = string.sub(argii, 2, -2)
   			argiii = string.sub(argiii, 2, -2)
   			return string.format("%s%s*{\\arb{%s}}[\\arb{%s}]{\\arb{%s}}", tag, argi, argii, argiii)
   end)
   str = string.gsub(str, "(\\bayt)%s?(%+?)(%b{})(%b{})", function(tag, plus, argi, argii)
   			argi = string.sub(argi, 2, -2)
   			argii = string.sub(argii, 2, -2)
			return string.format("%s%s*{\\arb{%s}}{\\arb{%s}}", tag, plus, argi, argii)
   end)
   str = string.gsub(str, "(\\prname)%s?(%b{})", function(tag, body)
			body = string.sub(body, 2, -2)
			if string.find(body, "\\uc%s?%b{}") then
			   return string.format("%s*{%s}", tag, body)
			else
			   return string.format("%s{\\arb[trans]{\\uc{%s}}}", tag, body)
			end
   end)
   str = string.gsub(str, "(\\begin%s?{arab})(%b[])", "\\bgroup\\arb%2{")
   str = string.gsub(str, "(\\begin%s?{arab})", "\\bgroup\\arb{")
   str = string.gsub(str, "\\end%s?{arab}", "}\\egroup")
   -- This does not work, while the following two do. Look into this later.
   -- str = gsub(str, lpeg.Cs("\\arb") * spcenc * bsqbrackets^-1 * bcbraces, function(tag, opt, body)
   -- 		 body = string.sub(body, 2, -2)
   -- 		 return string.format("%s%s\\@al@pr@ob%s\\@al@pr@cb", tag, opt, body)
   -- end)
   str = string.gsub(str, "(\\arb%s?)(%b[])(%b{})", function(tag, opt, body)
   			body = string.sub(body, 2, -2)
   			return string.format("%s%s\\@al@pr@ob%s\\@al@pr@cb", tag, opt, body)
   end)
   str = string.gsub(str, "(\\arb)%s?(%b{})", function(tag, body)
   			body = string.sub(body, 2, -2)
   			return string.format("%s\\@al@pr@ob%s\\@al@pr@cb", tag, body)
   end)
   str = string.gsub(str, "(\\arbmark)%s?(%b[])(%b{})", function(tag, opt, body)
   			body = string.sub(body, 2, -2)
   			return string.format("%s%s\\@al@pr@ob%s\\@al@pr@cb", tag, opt, body)
   end)
   str = string.gsub(str, "(\\arbmark)%s?(%b{})", function(tag, body)
   			body = string.sub(body, 2, -2)
   			return string.format("%s\\@al@pr@ob%s\\@al@pr@cb", tag, body)
   end)
   str = string.gsub(str, "(\\[Uu]c)%s?(%b{})", function(tag, body)
			body = string.sub(body, 2, -2)
			return string.format("%s\\@al@pr@ob%s\\@al@pr@cb", tag, body)
   end)
   str = string.gsub(str, "{", "\\@al@ob")
   str = string.gsub(str, "} ", "\\@al@cb@sp")
   str = string.gsub(str, "}", "\\@al@cb")
   str = string.gsub(str, "\\@al@pr@ob", "{")
   str = string.gsub(str, "\\@al@pr@cb", "}")
   str = string.gsub(str, "(%b{})", function(body)
			body = string.sub(body, 2, -2)
			body = string.gsub(body, "(%s?)(\\@al@ob)", "%1{")
			body = string.gsub(body, "(\\@al@cb@sp)", "} ")
			body = string.gsub(body, "(\\@al@cb)(%s?)", "}%2")
			return string.format("{%s}", body)
   end)
   if export_utf ~= "arabverse" then
      str = str.."\\end{arabexport}"
   else end
   return str
end

function arabluatex.arbtoutf(str)
   str = processarbtoutf(str)
   str = "\\ArbOutFile{"..str.."}"
   str = string.gsub(str, "(\\ArbOutFile)%s?(%b{})", function(tag, body)
			body = string.sub(body, 2, -2)
			body = gsub(body, lpeg.Cs("\\arb") * arbargs, "}%1%2\\ArbOutFile{")
			return string.format("%s{%s}", tag, body)
   end)
   str = string.gsub(str, "(\\ArbOutFile)%s?(%b{})", function(tag, body)
   			body = string.sub(body, 2, -2)
   			body = string.gsub(body, "(\\[Uu]c)%s?(%b{})", "}%1%2\\ArbOutFile{")
   			return string.format("%s{%s}", tag, body)
   end)
   str = string.gsub(str, "(\\ArbOutFile)%s?(%b{})", function(tag, body)
   			body = string.sub(body, 2, -2)
   			body = gsub(body, lpeg.Cs("\\arbmark") * arbargs, "}%1%2\\ArbOutFile{")
   			return string.format("%s{%s}", tag, body)
   end)
   return str
end

function arabluatex.tooutfile(str, nl)
   local f = io.open(tex.jobname..utffilesuffix.."_tmp.tex", "a+")
   if nl == "newline" then
      f:write(str, "\n\n")
   else
      f:write(str)
   end
   f:close()
   return str
end

function arabluatex.closestream()
   local f = io.open(tex.jobname..utffilesuffix.."_tmp.tex", "r")
   local o = io.open(tex.jobname..utffilesuffix..".tex", "w")
   local t = f:read("*a")
   t = string.gsub(t, "\\arabicfont{}", "")
   t = string.gsub(t, "\\altrfont{}", "")
   t = string.gsub(t, "\\par ", "\n\n")
   t = string.gsub(t, "(\\@al@ob)", "{")
   t = string.gsub(t, "(\\@al@cb@sp)", "} ")
   t = string.gsub(t, "(\\@al@cb)(%s?)", "}")
   t = string.gsub(t, "(\\bgroup%s?)(\\txarb%s?)(%b{})(\\egroup%s?)", function(tagio, tag, body, tagic)
		      body = string.sub(body, 2, -2)
		      return string.format("\\begin{txarab}%s\\end{txarab}", body)
   end)
   t = string.gsub(t, "(\\bgroup%s?)(\\txtrans%s?)(%b{})(\\egroup%s?)", function(tagio, tag, body, tagic)
		      body = string.sub(body, 2, -2)
		      return string.format("\\begin{txarabtr}%s\\end{txarabtr}", body)
   end)
   t = gsub(t, lpeg.Cs("\\begin") * spcenc^-1 * bcbraces * cmdargs,
	    "\n%1%2%3\n")
   t = string.gsub(t, "(\\\\)(%s?)", "%1\n")
   t = string.gsub(t, "(\\\\)(\n)(\\end%s?)(%b{})", "%1%3%4")
   t = string.gsub(t, "%s-\n(\\begin%s?)(%b{})", "\n%1%2")
   t = string.gsub(t, "(\\item)", "\n%1")
   t = string.gsub(t, "\n\n(\\item)", "\n%1")
   t = string.gsub(t, "(\\end%s?)(%b{})", "%1%2\n")
   t = string.gsub(t, "([^\n]%s-)(\\end)%s?(%b{})", "%1\n%2%3")
   t = string.gsub(t, "\n\n\n", "\n\n")
   t = string.gsub(t, "(\\txarb%s?%{)(\\txarb%s?)(%b{})(%})",
		   function(tagio, tagii, body, tagic)
		      body = string.sub(body, 2, -2)
		      return
			 string.format("%s%s%s", tagio, body, tagic)
   end)
   t = string.gsub(t, "(\\prname%s?%*%{)(\\txtrans%s?)(%b{})(%})",
		   function(tagio, tagii, body, tagic)
   		      body = string.sub(body, 2, -2)
   		      return string.format("%s%s%s", tagio, body, tagic)
   end)
   if string.find(t, "\\begin%s?{document}.-\\arb%s?[%[%{]")
      or
      string.find(t, "\\begin%s?{document}.-\\[Uu]c%s?%b{}")
      or
      string.find(t, "\\begin%s?{document}.-\\abjad%s?%b{}")
      or
      string.find(t, "\\begin%s?{document}.-\\ayah%s?%b{}")
   then
      -- issue a warning:
      tex.print([[\unexpanded{\PackageWarningNoLine{arabluatex}{]]
	 ..
	 [[There are still 'arabtex' strings to be converted. ]]
	 ..
	 [[Please open ]] .. tex.jobname .. utffilesuffix .. ".tex" ..
	 [[ and compile it one more time}}]])
      --
   else end
   t = gsub(t, rawcmd * spce^1 * aftercmd, "%1%3")
   t = t.."\n\\end{document}"
   io.write(t)
   o:write(t)
   f:close()
   o:close()
   os.remove(tex.jobname..utffilesuffix.."_tmp.tex")
   return true
end

-- Process standard arabluatex modes:
function arabluatex.processvoc(str, rules, scheme)
   str = takeoutarb(str)
   str = processarbnull(str, scheme)
   str = takeoutcapetc(str)
   str = protectarb(str)
   str = breakcmd(str)
   str = holdcmd(str)
   str = processarind(str)
   if scheme == "buckwalter" then
      str = processbuckw(str)
      else end
   if rules == "easy" or rules == "easynosukun" then
      str = voceasy(str)
   elseif rules == "dflt" or rules == "idgham" then
      str = voc(str, rules)
      else end
   str = unprotectarb(str)
   if export_utf == "yes" then
      tofile = "\\txarb{"..str.."}"
      arabluatex.tooutfile(tofile)
   elseif export_utf == "arabverse" then
      tofile = "\\txarb{"..str.."}"
      arabluatex.tooutfile(tofile)
   else
      return str
   end
   return ""
end

function arabluatex.processfullvoc(str, rules, scheme)
   str = takeoutarb(str)
   str = processarbnull(str, scheme)
   str = takeoutcapetc(str)
   str = protectarb(str)
   str = breakcmd(str)
   str = holdcmd(str)
   str = processarind(str)
   if scheme == "buckwalter" then
      str = processbuckw(str)
      else end
   if rules == "easy" then
      str = fullvoceasy(str, "sukun")
   elseif rules == "easynosukun" then
      str = fullvoceasy(str, "nosukun")
   elseif rules == "dflt" or rules == "idgham" then
      str = fullvoc(str, rules)
      else end
   str = unprotectarb(str)
   if export_utf == "yes" then
      tofile = "\\txarb{"..str.."}"
      arabluatex.tooutfile(tofile)
   elseif export_utf == "arabverse" then
      tofile = "\\txarb{"..str.."}"
      arabluatex.tooutfile(tofile)
   else
      return str
   end
   return ""
end

function arabluatex.processnovoc(str, rules, scheme)
   str = takeoutarb(str)
   str = processarbnull(str, scheme)
   str = takeoutcapetc(str)
   str = protectarb(str)
   str = breakcmd(str)
   str = holdcmd(str)
   str = processarind(str)
   if scheme == "buckwalter" then
      str = processbuckw(str)
      else end
   if rules == "easy" or rules == "easynosukun" then
      str = novoceasy(str)
   elseif rules == "dflt" or rules == "idgham" then
      str = novoc(str)
      else end
   str = unprotectarb(str)
   if export_utf == "yes" then
      tofile = "\\txarb{"..str.."}"
      arabluatex.tooutfile(tofile)
   elseif export_utf == "arabverse" then
      tofile = "\\txarb{"..str.."}"
      arabluatex.tooutfile(tofile)
   else
      return str
   end
   return ""
end

function arabluatex.processtrans(str, mode, rules, scheme)
   str = takeoutarb(str)
   str = processdiscretionary(str)
   str = processarbnull(str, scheme)
   str = takeout_abjad_ayah(str)
   str = protectarb(str)
   str = breakcmd(str)
   str = holdcmd(str)
   str = processarind(str, "trans")
   if scheme == "buckwalter" then
      str = processbuckw(str)
   end
   if mode == "dmg" or mode == "dmg+" then
      str = transdmg(str, mode, rules)
   elseif mode == "loc" then
      str = transloc(str)
   elseif mode == "arabica" then
      str = transarabica(str)
   end
   str = unprotectarb(str)
   if export_utf == "yes" then
      tofile = "\\txtrans{"..str.."}"
      arabluatex.tooutfile(tofile)
   elseif export_utf == "arabverse" then
      tofile = "\\txtrans{"..str.."}"
      arabluatex.tooutfile(tofile)
   else
      return str
   end
   return ""
end

function arabluatex.newarbmark(abbr, rtlmk, ltrmk)
   abbr = "@"..abbr
   rtlmk = "\\arabicfont{}"..rtlmk
   table.insert(arbmarks, {a = abbr, b = rtlmk, c = ltrmk})
   table.sort(arbmarks, function(a ,b) return(#a.a > #b.a) end)
   return true
end

local function isintable(table, element)
   for i = 1,#table do
      if table[i].a == element then
	 return true
      end
   end
   return false
end

function arabluatex.processarbmarks(str, dir)
   str = "@"..str
   if not isintable(arbmarks, str) then
      str = "\\LR{<??>}"..atletter.."\\al@wrong@mark{}"..atother
   else
      if dir == "lr" then
	 for i = 1,#arbmarks do
	    str  = string.gsub(str, arbmarks[i].a, arbmarks[i].c)
	 end
      elseif dir == "rl" then
	 for i = 1,#arbmarks do
	    str  = string.gsub(str, arbmarks[i].a, arbmarks[i].b)
	 end
      elseif tex.textdir == "TLT" then
	 for i = 1,#arbmarks do
	    str  = string.gsub(str, arbmarks[i].a, arbmarks[i].c)
	 end
      else
	 for i = 1,#arbmarks do
	    str  = string.gsub(str, arbmarks[i].a, arbmarks[i].b)
	 end
      end
   end
   if export_utf == "yes" then
      tofile = str
      arabluatex.tooutfile(tofile)
   elseif export_utf == "arabverse" then
      tofile = str
      arabluatex.tooutfile(tofile)
   else
      return str
   end
   return ""
end

function arabluatex.uc(str)
   str = string.gsub(str, "(\\txtrans.?)(%b{})", function(tag, body)
			body = string.sub(body, 2, -2)
			return string.format("%s", body)
   end)
   str = string.gsub(str, "\\altrfont%s?{}", "")
   str = string.gsub(str, "{", "\\@al@ob")
   str = string.gsub(str, "} ", "\\@al@cb@sp ")
   str = string.gsub(str, "}", "\\@al@cb")
   -- Allah and ibn
   str = string.gsub(str, "(al%-lāh)([uai]?)", "{Allāh%2}")
   str = string.gsub(str, "([%'%-]?)(l%-lāh)([uai]?)", "%1{Llāh%3}")
   str = string.gsub(str, "(%s[%(%<%[]?)([i%']?b[n%.])", "%1{%2}")
   for i = 1,#lcuc do
      str = string.gsub(str, "^([%S]-%-[`']?)"..lcuc[i].a, "{%1"..lcuc[i].b.."}")
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "(%s[%(%<%[]?)([%S]-%-[`']?)"..lcuc[i].a, "%1{%2"..lcuc[i].b.."}")
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "^([%S]-%-ʿ)"..lcuc[i].a, "{%1"..lcuc[i].b.."}")
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "(%s[%(%<%[]?)([%S]-%-ʿ)"..lcuc[i].a, "%1{%2"..lcuc[i].b.."}")
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "^([%S]-%-ʾ)"..lcuc[i].a, "{%1"..lcuc[i].b.."}")
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "(%s[%(%<%[]?)([%S]-%-ʾ)"..lcuc[i].a, "%1{%2"..lcuc[i].b.."}")
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "^([`'])"..lcuc[i].a, "{%1"..lcuc[i].b.."}")
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "(%s[%(%<%[]?)([`'])"..lcuc[i].a, "%1{%2"..lcuc[i].b.."}")
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "^(ʾ)"..lcuc[i].a, "{%1"..lcuc[i].b.."}")
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "(%s[%(%<%[]?)(ʾ)"..lcuc[i].a, "%1{%2"..lcuc[i].b.."}")
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "^(ʿ)"..lcuc[i].a, "{%1"..lcuc[i].b.."}")
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "(%s[%(%<%[]?)(ʿ)"..lcuc[i].a, "%1{%2"..lcuc[i].b.."}")
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "^"..lcuc[i].a, lcuc[i].b)
   end
   for i = 1,#lcuc do
      str = string.gsub(str, "(%s[%(%<%[]?)"..lcuc[i].a, "%1"..lcuc[i].b)
   end
   str = string.gsub(str, "{", "")
   str = string.gsub(str, "}", "")
   str = string.gsub(str, "\\@al@ob", "{")
   str = string.gsub(str, "\\@al@cb@sp ", "} ")
   str = string.gsub(str, "\\@al@cb", "}")
   str = "\\altrfont{}"..str
   if export_utf == "yes" then
      tofile = str
      arabluatex.tooutfile(tofile)
   elseif export_utf == "arabverse" then
      tofile = str
      arabluatex.tooutfile(tofile)
   else
      return str
   end
   return ""
end

-- this function is adapted from an 'obsolete project' of Khaled
-- Hosny's that dates back to 2010. Thanks to him.
-- See https://github.com/khaledhosny/lualatex-arabic
function arabluatex.abjadify(n)
   local abjadnum = ""
   n = tonumber(n)
    if n >= 1000 then
        for i=1,math.floor(n/1000) do
            abjadnum = abjadnum .. abjad[4][1]
        end
        n = math.fmod(n,1000)
    end
    if n >= 100 then
        abjadnum = abjadnum .. abjad[3][math.floor(n/100)]
        n = math.fmod(n, 100)
    end
    if n >= 10 then
        abjadnum = abjadnum .. abjad[2][math.floor(n/10)]
        n = math.fmod(n, 10)
    end
    if n >= 1 then
        abjadnum = abjadnum .. abjad[1][math.floor(n/1)]
    end
    return "\\arb[novoc]{"..abjadnum.."}"
end

function arabluatex.abraces(str)
   if tex.textdir == "TRT"
   then
      if getrenderer() == "harf"
      then
	 str = "\\{"..str.."\\}"
      else
	 str = "\\}"..str.."\\{"
      end
   elseif tex.textdir == "TLT" then
      str = "\\{"..str.."\\}"
   end
   return str
end

function arabluatex.aemph(str, opt)
   if tex.textdir == "TRT" then
      str = "\\aoline{\\textdir TRT{}"..str.."}"
   elseif tex.textdir == "TLT" then
      if opt == "over" then
	 str = "\\aoline{"..str.."}"
      else
	 str = "\\auline{"..str.."}"
      end
   end
   return str
end

function arabluatex.ayah(str)
   if tonumber(str) ~= nil and str.len(str) < 4 then
      if tex.textdir == "TRT" then
	 -- end of ayah is typeset LTR and the number comes after the
	 -- sign (see https://github.com/aliftype/amiri/issues/263#issuecomment-1872979252)
	 str = "{\\textdir TLT ".."^^^^06dd"..indnum(str, "ltr").."}"
      elseif tex.textdir == "TLT" then
	 str = "\\arb[trans]{("..str..")}"
      end
      return str
   else
      return "\\LR{<??>}"
   end
end