Binabago: Module:ConvertNumeric

-- Module for converting between different representations of numbers. See talk page for user documentation.
-- For unit tests see: [[Module:ConvertNumeric/testcases]]
-- When editing, preview with: [[Module_talk:ConvertNumeric/testcases]]
-- First, edit [[Module:ConvertNumeric/sandbox]], then preview with [[Module_talk:ConvertNumeric/sandbox/testcases]]

local ones_position = {
	[0] = 'sero',
	[1] = 'isa',
	[2] = 'dalawa',
	[3] = 'tatlo',
	[4] = 'apat',
	[5] = 'lima',
	[6] = 'anim',
	[7] = 'pito',
	[8] = 'walo',
	[9] = 'siyam',
	[10] = 'sampu',
	[11] = 'labing-isa',
	[12] = 'labindalawa',
	[13] = 'labintatlo',
	[14] = 'labing-apat',
	[15] = 'labinlima',
	[16] = 'labing-anim',
	[17] = 'labimpito',
	[18] = 'labing-walo',
	[19] = 'labinsiyam'
}

local ones_position_ord = {
	[0] = 'ikasero',
	[1] = 'una',
	[2] = 'ikalawa',
	[3] = 'ikatlo',
	[4] = 'ikaapat',
	[5] = 'ikalima',
	[6] = 'ikaanim',
	[7] = 'ikapito',
	[8] = 'ikawalo',
	[9] = 'ikasiyam',
	[10] = 'ikasampu',
	[11] = 'ikalabing-isa',
	[12] = 'ikalabindalawa',
	[13] = 'ikalabintatlo',
	[14] = 'ikalabing-apat',
	[15] = 'ikalabinlima',
	[16] = 'ikalabing-anim',
	[17] = 'ikalabimpito',
	[18] = 'ikalabing-walo',
	[19] = 'ikalabinsiyam'
}

local ones_position_plural = {
	[0] = 'zeros',
	[1] = 'ones',
	[2] = 'twos',
	[3] = 'threes',
	[4] = 'fours',
	[5] = 'fives',
	[6] = 'sixes',
	[7] = 'sevens',
	[8] = 'eights',
	[9] = 'nines',
	[10] = 'tens',
	[11] = 'elevens',
	[12] = 'twelves',
	[13] = 'thirteens',
	[14] = 'fourteens',
	[15] = 'fifteens',
	[16] = 'sixteens',
	[17] = 'seventeens',
	[18] = 'eighteens',
	[19] = 'nineteens'
}

local tens_position = {
	[2] = 'dalawampu',
	[3] = 'tatlumpu',
	[4] = 'apatnapu',
	[5] = 'limampu',
	[6] = 'animnapu',
	[7] = 'pitumpu',
	[8] = 'walumpu',
	[9] = 'siyamnapu'
}

local tens_position_ord = {
	[2] = 'ikadalawampu',
	[3] = 'ikatatlumpu',
	[4] = 'ikaapatnapu',
	[5] = 'ikalimampu',
	[6] = 'ikaanimnapu',
	[7] = 'ikapitumpu',
	[8] = 'ikawalumpu',
	[9] = 'ikasiyamnapu'
}

local groups = {
	[1] = 'libo',
	[2] = 'milyon',
	[3] = 'bilyon',
	[4] = 'trilyon',
	[5] = 'kuwadrilyon',
	[6] = 'kintilyon',
	[7] = 'sekstilyon',
	[8] = 'septilyon',
	[9] = 'oktilyon',
	[10] = 'nonilyon',
	[11] = 'desilyon',
	[12] = 'undesilyon',
	[13] = 'duwodesilyon',
	[14] = 'tredesilyon',
	[15] = 'kuwatuwordesilyon',
	[16] = 'kuwindesilyon',
	[17] = 'seksdesilyon',
	[18] = 'septendesilyon',
	[19] = 'oktodesilyon',
	[20] = 'nobemdesilyon',
	[21] = 'bigintilyon',
	[22] = 'unbigintilyon',
	[23] = 'duwobigintilyon',
	[24] = 'tresbigintilyon',
	[25] = 'kuwatuworbigintilyon',
	[26] = 'kuwinkuwabigintilyon',
	[27] = 'sesbigintilyon',
	[28] = 'septembigintilyon',
	[29] = 'oktobigintilyon',
	[30] = 'nobembigintilyon',
	[31] = 'trigintilyon',
	[32] = 'untrigintilyon',
	[33] = 'duwotrigintilyon',
	[34] = 'trestrigintilyon',
	[35] = 'kuwatuwortrigintilyon',
	[36] = 'kuwinkuwatrigintilyon',
	[37] = 'sestrigintilyon',
	[38] = 'septentrigintilyon',
	[39] = 'oktotrigintilyon',
	[40] = 'nobentrigintilyon',
	[41] = 'kuwadragintilyon',
	[51] = 'kuwinkuwagintilyon',
	[61] = 'seksagintilyon',
	[71] = 'septuwagintilyon',
	[81] = 'oktogintilyon',
	[91] = 'nonagintilyon',
	[101] = 'sentilyon',
	[102] = 'unsentilyon',
	[103] = 'duwosentilyon',
	[104] = 'tresentilyon',
	[111] = 'desisentilyon',
	[112] = 'undesisentilyon',
	[121] = 'bigintisentilyon',
	[122] = 'unbigintisentilyon',
	[131] = 'trigintasentilyon',
	[141] = 'kuwadragintasentilyon',
	[151] = 'kuwinkuwagintasentiyon',
	[161] = 'seksagintasentilyon',
	[171] = 'septuwagintasentilyon',
	[181] = 'oktogintasentilyon',
	[191] = 'nonagintasentilyon',
	[201] = 'dusentilyon',
	[301] = 'tresentilyon',
	[401] = 'kuwadringentilyon',
	[501] = 'kuwingentilyon',
	[601] = 'sesentilyon',
	[701] = 'septingentilyon',
	[801] = 'oktingentilyon',
	[901] = 'nongentilyon',
	[1001] = 'millinilyon',
}

local roman_numerals = {
	I = 1,
	V = 5,
	X = 10,
	L = 50,
	C = 100,
	D = 500,
	M = 1000
}

local tag_lt20 = {
	['ikasero']      =  0,
	['una']       =  1,
	['ikalawa']      =  2,
	['ikatlo']       =  3,
	['ikaapat']      =  4,
	['ikalima']       =  5,
	['ikaanim']       =  6,
	['ikapito']     =  7,
	['ikawalo']      =  8,
	['ikasiyam']       =  9,
	['ikasampu']       = 10,
	['ikalabing-isa']    = 11,
	['ikalabindalawa']     = 12,
	['ikalabintatlo']  = 13,
	['ikalabing-apat']  = 14,
	['ikalabinlima']   = 15,
	['ikalabing-anim']   = 16,
	['ikalabimpito'] = 17,
	['ikalabing-walo']  = 18,
	['ikalabinsiyam']  = 19,
}
local tag_tens_cont  = {
	['ikadalawampu']  = 20,
	['ikatatlumpu']  = 30,
	['ikaapatnapu']   = 40,
	['ikalimampu']   = 50,
	['ikanimnapu']   = 60,
	['ikapitumpu'] = 70,
	['ikawalumpu']  = 80,
	['ikasiyamnapu']  = 90,
}
local tag_tens_cont = {
	['dalawampu']  = 20,
	['tatlumpu']  = 30,
	['apatnapu']   = 40,
	['limampu']   = 50,
	['animnapu']   = 60,
	['pitumpu'] = 70,
	['walumpu']  = 80,
	['siyamnapu']  = 90,
}

-- Converts a given valid roman numeral (and some invalid roman numerals) to a number. Returns -1, errorstring on error
local function roman_to_numeral(roman)
	if type(roman) ~= "string" then return -1, "roman numeral not a string" end
	local rev = roman:reverse()
	local raising = true
	local last = 0
	local result = 0
	for i = 1, #rev do
		local c = rev:sub(i, i)
		local next = roman_numerals[c]
		if next == nil then return -1, "roman numeral contains illegal character " .. c end
		if next > last then
			result = result + next
			raising = true
		elseif next < last then
			result = result - next
			raising = false
		elseif raising then
			result = result + next
		else
			result = result - next
		end
		last = next
	end
	return result
end

-- Converts a given integer between 0 and 100 to Tagalog text (e.g. 47 -> forty-seven)
local function numeral_to_tagalog_less_100(num, ordinal, plural, zero)
	local terminal_ones, terminal_tens, ika, mga
	ika = ''
	mga = ''
	if ordinal then
      if num < 20 then
		terminal_ones = ones_position_ord 
	  elseif num % 10 == 0 then
     	terminal_tens = tens_position_ord
      else
		terminal_ones = ones_position 
    	terminal_tens = tens_position
        ika = "ika"	  
      end
	elseif plural then
		terminal_ones = ones_position
		terminal_tens = tens_position
		mga = ""
	else
		terminal_ones = ones_position
		terminal_tens = tens_position
	end

	if num == 0 and zero ~= nil then
		return zero
	elseif num < 20 then
		return terminal_ones[num]
	elseif num % 10 == 0 then
		return terminal_tens[num / 10]
	else
		return mga .. ika .. tens_position[math.floor(num / 10)] .. "'t" .. ' ' .. terminal_ones[num % 10]
	end
end

local function standard_suffix(ordinal, plural)
	if ordinal then return 'ika' end
	if plural then return 'mga ' end
	return ''
end

local function numeral_naong(num, bilang, st)
	if bilang < 6 then
		if (num == 4 or num == 6 or num == 9) then
		    return ' na'
		else
			return 'ng'
		end
	else
		if (st == 'apat' or st == 'anim' or st == 'siyam') then
		    return ' na'
		else
			return 'ng'
		end
	end
end

local function text_naong(ch, bilang)

	    if (ch == 't' or ch == 'm')	then
	  	    return ' na'
	    elseif ch == ' ' then
		   return ''
		else
			return 'ng'
	    end

end

local function daanoraan(num, bilang)
	if bilang > 5 then
	    if (num == 4 or num == 6 or num == 9) then
		    return ' raang '
		else
			return ' daang '
		end
	else
		if (num == 4 or num == 6 or num == 9) then
		    return ' raan '
		else
			return ' daan '
		end
	end
end

local function daatoraat(num)
	if (num == 4 or num == 6 or num == 9) then
	    return " raa't "
	else
		return " daa't "
	end
end

-- Converts a given integer (in string form) between 0 and 1000 to Tagalog text (e.g. 47 -> forty-seven)
local function numeral_to_tagalog_less_1000(num, use_and, ordinal, plural, zero, bilang)
	num = tonumber(num)
	if num < 100 then
		return numeral_to_tagalog_less_100(num, ordinal, plural, zero)
	elseif num % 100 == 0 then
		return  standard_suffix(ordinal, plural) .. ones_position[num/100] .. numeral_naong(num/100, bilang, ones_position[num/100]) .. daanoraan(num/100, bilang)
	else
		if ordinal then
			return standard_suffix(ordinal, plural) .. ones_position[math.floor(num/100)] .. numeral_naong(math.floor(num/100), bilang, ones_position[math.floor(num/100)]) .. daatoraat(math.floor(num/100)) .. numeral_to_tagalog_less_100(num % 100, not ordinal, plural, zero)
		else
			return standard_suffix(ordinal, plural) .. ones_position[math.floor(num/100)] .. numeral_naong(math.floor(num/100), bilang, ones_position[math.floor(num/100)]) .. daatoraat(math.floor(num/100)) .. numeral_to_tagalog_less_100(num % 100, ordinal, plural, zero)
		end
	end
end



-- Converts an Tagalog-text ordinal between 'zeroth' and 'ninety-ninth' to a number [0–99], else -1
local function tagalog_to_ordinal(tagalog)
	local tag = string.lower(tagalog or '')
	
	local tag_lt20 = tag_lt20
	local tag_tens_cont = tag_tens_cont
	local tag_tens_cont = tag_tens_cont
	
	if tag_lt20[tag] then
		return tag_lt20[tag] --e.g. first -> 1
	elseif tag_tens_cont[tag] then
		return tag_tens_cont[tag] --e.g. ninetieth -> 90
	else
		local tens, ones = string.match(tag, '^([a-z]+)%-([a-z]+)$')
		if tens and ones then
			local tens_cont = tag_tens_cont[tens]
			local ones_end  = tag_lt20[ones]
			if tens_cont and ones_end then
				return tens_cont + ones_end --e.g. ninety-ninth -> 99
			end
		end
	end
	return -1 --failed
end

-- Converts a number expressed as a string in scientific notation to a string in standard decimal notation
-- e.g. 1.23E5 -> 123000, 1.23E-5 = .0000123. Conversion is exact, no rounding is performed.
local function scientific_notation_to_decimal(num)
	local exponent, subs = num:gsub("^%-?%d*%.?%d*%-?[Ee]([+%-]?%d+)$", "%1")
	if subs == 0 then return num end  -- Input not in scientific notation, just return unmodified
	exponent = tonumber(exponent)

	local negative = num:find("^%-")
	local _, decimal_pos = num:find("%.")
	-- Mantissa will consist of all decimal digits with no decimal point
	local mantissa = num:gsub("^%-?(%d*)%.?(%d*)%-?[Ee][+%-]?%d+$", "%1%2")
	if negative and decimal_pos then decimal_pos = decimal_pos - 1 end
	if not decimal_pos then decimal_pos = #mantissa + 1 end

	-- Remove leading zeros unless decimal point is in first position
	while decimal_pos > 1 and mantissa:sub(1,1) == '0' do
		mantissa = mantissa:sub(2)
		decimal_pos = decimal_pos - 1
	end
	-- Shift decimal point right for exponent > 0
	while exponent > 0 do
		decimal_pos = decimal_pos + 1
		exponent = exponent - 1
		if decimal_pos > #mantissa + 1 then mantissa = mantissa .. '0' end
		-- Remove leading zeros unless decimal point is in first position
		while decimal_pos > 1 and mantissa:sub(1,1) == '0' do
			mantissa = mantissa:sub(2)
			decimal_pos = decimal_pos - 1
		end
	end
	-- Shift decimal point left for exponent < 0
	while exponent < 0 do
		if decimal_pos == 1 then
			mantissa = '0' .. mantissa
		else
			decimal_pos = decimal_pos - 1
		end
		exponent = exponent + 1
	end

	-- Insert decimal point in correct position and return
	return (negative and '-' or '') .. mantissa:sub(1, decimal_pos - 1) .. '.' .. mantissa:sub(decimal_pos)
end

-- Rounds a number to the nearest integer (NOT USED)
local function round_num(x)
	if x%1 >= 0.5 then
		return math.ceil(x)
	else
		return math.floor(x)
	end
end

-- Rounds a number to the nearest two-word number (round = up, down, or "on" for round to nearest)
-- Numbers with two digits before the decimal will be rounded to an integer as specified by round.
-- Larger numbers will be rounded to a number with only one nonzero digit in front and all other digits zero.
-- Negative sign is preserved and does not count towards word limit.
local function round_for_tagalog(num, round)
	-- If an integer with at most two digits, just return
	if num:find("^%-?%d?%d%.?$") then return num end

	local negative = num:find("^%-")
	if negative then
		-- We're rounding magnitude so flip it
		if round == 'up' then round = 'down' elseif round == 'down' then round = 'up' end
	end

	-- If at most two digits before decimal, round to integer and return
	local _, _, small_int, trailing_digits, round_digit = num:find("^%-?(%d?%d?)%.((%d)%d*)$")
	if small_int then
		if small_int == '' then small_int = '0' end
		if (round == 'up' and trailing_digits:find('[1-9]')) or (round == 'on' and tonumber(round_digit) >= 5) then
			small_int = tostring(tonumber(small_int) + 1)
		end
		return (negative and '-' or '') .. small_int
	end

	-- When rounding up, any number with > 1 nonzero digit will round up (e.g. 1000000.001 rounds up to 2000000)
	local nonzero_digits = 0
	for digit in num:gfind("[1-9]") do
		nonzero_digits = nonzero_digits + 1
	end

	num = num:gsub("%.%d*$", "") -- Remove decimal part
	-- Second digit used to determine which way to round lead digit
	local _, _, lead_digit, round_digit, round_digit_2, rest = num:find("^%-?(%d)(%d)(%d)(%d*)$")
	if tonumber(lead_digit .. round_digit) < 20 and (1 + #rest) % 3 == 0 then
		-- In Tagalog numbers < 20 are one word so put 2 digits in lead and round based on 3rd
		lead_digit = lead_digit .. round_digit
		round_digit = round_digit_2
	else
		rest = round_digit_2 .. rest
	end

	if (round == 'up' and nonzero_digits > 1) or (round == 'on' and tonumber(round_digit) >= 5) then
		lead_digit = tostring(tonumber(lead_digit) + 1)
	end
	-- All digits but lead digit will turn to zero
	rest = rest:gsub("%d", "0")
	return (negative and '-' or '') .. lead_digit .. '0' .. rest
end

local denominators = {
	[2] = { 'kalahati', plural = 'mga kalahati' },
	[3] = { 'isang-katlo' },
	[4] = { 'sangkapat', us = 'pang-apat' },
	[5] = { 'ikalimang bahagi' },
	[6] = { 'ikaanim na bahagi' },
	[8] = { 'ikawalong bahagi' },
	[9] = { 'ikasiyam na bahagi' },
	[10] = { 'ikasampu' },
	[16] = { 'ikalabing-anim na bahagi' },
}

-- Return status, fraction where:
-- status is a string:
--     "finished" if there is a fraction with no whole number;
--     "ok" if fraction is empty or valid;
--     "unsupported" if bad fraction;
-- fraction is a string giving (numerator / denominator) as Tagalog text, or is "".
-- Only unsigned fractions with a very limited range of values are supported,
-- except that if whole is empty, the numerator can use "-" to indicate negative.
-- whole (string or nil): nil or "" if no number before the fraction
-- numerator (string or nil): numerator, if any (default = 1 if a denominator is given)
-- denominator (string or nil): denominator, if any
-- sp_us (boolean): true if sp=us
-- negative_word (string): word to use for negative sign, if whole is empty
-- use_one (boolean): false: 2+1/2 → "two and a half"; true: "two and one-half"
local function fraction_to_tagalog(whole, numerator, denominator, sp_us, negative_word, use_one)
	if numerator or denominator then
		local finished = (whole == nil or whole == '')
		local sign = ''
		if numerator then
			if finished and numerator:sub(1, 1) == '-' then
				numerator = numerator:sub(2)
				sign = negative_word .. ' '
			end
		else
			numerator = '1'
		end
		if not numerator:match('^%d+$') or not denominator or not denominator:match('^%d+$') then
			return 'unsupported', ''
		end
		numerator = tonumber(numerator)
		denominator = tonumber(denominator)
		local dendata = denominators[denominator]
		if not (dendata and 1 <= numerator and numerator <= 99) then
			return 'unsupported', ''
		end
		local numstr, denstr
		local sep = '-'
		if numerator == 1 then
			denstr = sp_us and dendata.us or dendata[1]
			if finished or use_one then
				numstr = 'isang'
			elseif denstr:match('^[aeiou]') then
				numstr = 'isang'
				sep = ' '
			else
				numstr = 'isang'
				sep = ' '
			end
		else
			numstr = numeral_to_tagalog_less_100(numerator)
			denstr = dendata.plural
			if not denstr then
				denstr = (sp_us and dendata.us or dendata[1]) .. 's'
			end
		end
		if finished then
			return 'finished', sign .. numstr .. sep .. denstr
		end
		return 'ok', ' and ' .. numstr .. sep .. denstr
	end
	return 'ok', ''
end

-- Takes a decimal number and converts it to Tagalog text.
-- Return nil if a fraction cannot be converted (only some numbers are supported for fractions).
-- num (string or nil): the number to convert.
--      Can be an arbitrarily large decimal, such as "-123456789123456789.345", and
--      can use scientific notation (e.g. "1.23E5").
--      May fail for very large numbers not listed in "groups" such as "1E4000".
--      num is nil if there is no whole number before a fraction.
-- numerator (string or nil): numerator of fraction (nil if no fraction)
-- denominator (string or nil): denominator of fraction (nil if no fraction)
-- capitalize (boolean): whether to capitalize the result (e.g. 'One' instead of 'one')
-- use_and (boolean): whether to use the word 'and' between tens/ones place and higher places
-- hyphenate (boolean): whether to hyphenate all words in the result, useful for use as an adjective
-- ordinal (boolean): whether to produce an ordinal (e.g. 'first' instead of 'one')
-- plural (boolean): whether to pluralize the resulting number
-- links: nil: do not add any links; 'on': link "billion" and larger to Orders of magnitude article;
--        any other text: list of numbers to link (e.g. "billion,quadrillion")
-- negative_word: word to use for negative sign (typically 'negative' or 'minus'; nil to use default)
-- round: nil or '': no rounding; 'on': round to nearest two-word number; 'up'/'down': round up/down to two-word number
-- zero: word to use for value '0' (nil to use default)
-- use_one (boolean): false: 2+1/2 → "two and a half"; true: "two and one-half"
local function _numeral_to_tagalog(num, numerator, denominator, capitalize, use_and, hyphenate, ordinal, plural, links, negative_word, round, zero, use_one)
	if not negative_word then
		if use_and then
			-- TODO Should 'minus' be used when do not have sp=us?
			--      If so, need to update testcases, and need to fix "minus zero".
			-- negative_word = 'minus'
			negative_word = 'negatibo'
		else
			negative_word = 'negatibo'
		end
	end
	local status, fraction_text = fraction_to_tagalog(num, numerator, denominator, not use_and, negative_word, use_one)
	if status == 'unsupported' then
		return nil
	end
	if status == 'finished' then
		-- Input is a fraction with no whole number.
		-- Hack to avoid executing stuff that depends on num being a number.
		local s = fraction_text
		if hyphenate then s = s:gsub("%s", "-") end
		if capitalize then s = s:gsub("^%l", string.upper) end
		return s
	end
	num = scientific_notation_to_decimal(num)
	if round and round ~= '' then
		if round ~= 'on' and round ~= 'up' and round ~= 'down' then
			error("Invalid rounding mode")
		end
		num = round_for_tagalog(num, round)
	end

	-- Separate into negative sign, num (digits before decimal), decimal_places (digits after decimal)
	local MINUS = '−'  -- Unicode U+2212 MINUS SIGN (may be in values from [[Module:Convert]])
	if num:sub(1, #MINUS) == MINUS then
		num = '-' .. num:sub(#MINUS + 1)  -- replace MINUS with '-'
	elseif num:sub(1, 1) == '+' then
		num = num:sub(2)  -- ignore any '+'
	end
	local negative = num:find("^%-")
	local decimal_places, subs = num:gsub("^%-?%d*%.(%d+)$", "%1")
	if subs == 0 then decimal_places = nil end
	num, subs = num:gsub("^%-?(%d*)%.?%d*$", "%1")
	if num == '' and decimal_places then num = '0' end
	if subs == 0 or num == '' then error("Invalid decimal numeral") end

	-- For each group of 3 digits except the last one, print with appropriate group name (e.g. million)
	local s = ''
	if (ordinal or plural) and #num > 3 then
		-- Round numbers like "one million" take standard suffixes for ordinal/plural
		s = s .. standard_suffix(ordinal, plural)
	end
	local bilang = #num
	while #num > 3 do
		if (s ~= '' and s ~= 'ika') then
			s = s .. ' ' 
		end
		local group_num = math.floor((#num - 1) / 3)
		local group = groups[group_num]
		local group_digits = #num - group_num*3
		
		local numtag
		
		if ordinal then
			numtag = numeral_to_tagalog_less_1000(num:sub(1, group_digits), use_and, not ordinal, plural, zero, bilang)
   	    else
   	    	numtag = numeral_to_tagalog_less_1000(num:sub(1, group_digits), use_and, ordinal, plural, zero, bilang) 
   	    end
        s = s .. numtag .. text_naong(numtag:sub(numtag:len(numtag)), bilang) .. ' ' 

	--	if links and (((links == 'on' and group_num >= 3) or links:find(group)) and group_num <= 13) then
	--		s = s .. '[[Orders_of_magnitude_(numbers)#10' .. group_num*3 .. '|' .. group .. ']]'
	--	else
	
	   if group == 'libo' and num:sub(num:len(num) - 3) % 1000 == 0 then
			s = s .. group
		elseif group == 'libo' and num:sub(num:len(num) - 3) % 1000 ~= 0 then
		    s = s .. "libo't"
		else
			s = s .. group
	    end	
	--	end
		num = num:sub(1 + group_digits)
		num = num:gsub("^0*", "")  -- Trim leading zeros
	end

	-- Handle final three digits of integer part
	if s ~= '' and num ~= '' then
		if #num <= 2 and use_and then
			s = s .. ' at '
		else
			s = s .. ' '
		end
	end
	local c1, c2
	if s == '' or num ~= '' then
		if (ordinal and bilang > 3) then
		  c2 = numeral_to_tagalog_less_1000(num, use_and, ordinal, plural, zero, bilang)
		  if c2 == 'una' then
		    c1 = 'isa'
	  	  elseif c2 == 'ikalawa' then
	        c1 = 'dalawa'
	      elseif c2 == 'ikatlo' then
	        c1 = 'tatlo'
	      else
  	       	 c1 = numeral_to_tagalog_less_1000(num, use_and, ordinal, plural, zero, bilang):sub(4) 	      	
	      end
		   s = s .. c1
		else
			s = s .. numeral_to_tagalog_less_1000(num, use_and, ordinal, plural, zero, bilang) 
		end
	end

	-- For decimal places (if any) output "point" followed by spelling out digit by digit
	if decimal_places then
		s = s .. ' point'
		for i = 1, #decimal_places do
			s = s .. ' ' .. ones_position[tonumber(decimal_places:sub(i,i))]
		end
	end

	s = s:gsub("^%s*(.-)%s*$", "%1")   -- Trim whitespace
	if ordinal and plural then s = s .. 's' end  -- s suffix works for all ordinals
	if negative and s ~= zero then s = negative_word .. ' ' .. s end
	s = s:gsub("negative zero", "zero")
	s = s .. fraction_text
	if hyphenate then s = s:gsub("%s", "-") end
	if capitalize then s = s:gsub("^%l", string.upper) end
	return s
end

local function _numeral_to_tagalog2(args)
	local num = args.num

	if (not tonumber(num)) then
		num = num:gsub("^%s*(.-)%s*$", "%1")   -- Trim whitespace
		num = num:gsub(",", "")   -- Remove commas
		num = num:gsub("^<span[^<>]*></span>", "") -- Generated by Template:age
		if num ~= '' then  -- a fraction may have an empty whole number
			if not num:find("^%-?%d*%.?%d*%-?[Ee]?[+%-]?%d*$") then
				-- Input not in a valid format, try to pass it through #expr to see
				-- if that produces a number (e.g. "3 + 5" will become "8").
				num = mw.getCurrentFrame():preprocess('{{#expr: ' .. num .. '}}')
			end
		end
	end

	-- Pass args from frame to helper function
	return _numeral_to_tagalog(
		num,
		args['numerator'],
		args['denominator'],
		args['capitalize'],
		args['use_and'],
		args['hyphenate'],
		args['ordinal'],
		args['plural'],
		args['links'],
		args['negative_word'],
		args['round'],
		args['zero'],
		args['use_one']
	) or ''
end

local p = {  -- Functions that can be called from another module
	roman_to_numeral = roman_to_numeral,
	spell_number = _numeral_to_tagalog,
	spell_number2 = _numeral_to_tagalog2,	
	tagalog_to_ordinal = tagalog_to_ordinal,
}

function p._roman_to_numeral(frame) -- Callable via {{#invoke:ConvertNumeric|_roman_to_numeral|VI}}
	return roman_to_numeral(frame.args[1])
end

function p._tagalog_to_ordinal(frame) -- callable via {{#invoke:ConvertNumeric|_tagalog_to_ordinal|First}}
	return tagalog_to_ordinal(frame.args[1])
end

function p.numeral_to_tagalog(frame)
	local args = frame.args
	local num = args[1]
	num = num:gsub("^%s*(.-)%s*$", "%1")   -- Trim whitespace
	num = num:gsub(",", "")   -- Remove commas
	num = num:gsub("^<span[^<>]*></span>", "") -- Generated by Template:age
	if num ~= '' then  -- a fraction may have an empty whole number
		if not num:find("^%-?%d*%.?%d*%-?[Ee]?[+%-]?%d*$") then
			-- Input not in a valid format, try to pass it through #expr to see
			-- if that produces a number (e.g. "3 + 5" will become "8").
			num = frame:preprocess('{{#expr: ' .. num .. '}}')
		end
	end

	-- Pass args from frame to helper function
	return _numeral_to_tagalog(
		num,
		args['numerator'],
		args['denominator'],
		args['case'] == 'U' or args['case'] == 'u',
		args['sp'] ~= 'us',
		args['adj'] == 'on',
		args['ord'] == 'on',
		args['pl'] == 'on',
		args['lk'],
		args['negative'],
		args['round'],
		args['zero'],
		args['one'] == 'one'  -- experiment: using '|one=one' makes fraction 2+1/2 give "two and one-half" instead of "two and a half"
	) or ''
end

---- recursive function for p.decToHex
local function decToHexDigit(dec)
	local dig = {"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"}
	local div = math.floor(dec/16)
	local mod = dec-(16*div)
	if div >= 1 then return decToHexDigit(div)..dig[mod+1] else return dig[mod+1] end
end -- I think this is supposed to be done with a tail call but first I want something that works at all
---- finds all the decimal numbers in the input text and hexes each of them
function p.decToHex(frame)
	local args=frame.args
	local parent=frame.getParent(frame)
	local pargs={}
	if parent then pargs=parent.args end
	local text=args[1] or pargs[1] or ""
	local minlength=args.minlength or pargs.minlength or 1
	minlength=tonumber(minlength)
	local prowl=mw.ustring.gmatch(text,"(.-)(%d+)")
	local output=""
	repeat
		local chaff,dec=prowl()
		if not(dec) then break end
		local hex=decToHexDigit(dec)
		while (mw.ustring.len(hex)<minlength) do hex="0"..hex end
		output=output..chaff..hex
	until false
	local chaff=mw.ustring.match(text,"(%D+)$") or ""
	return output..chaff
end

return p