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-- This module converts a number into its written English form.
-- For example, "2" becomes "two", and "79" becomes "seventy-nine".
 
local getArgs = require('Module:Arguments').getArgs
 
local p = {}
 
local max = 100 -- The maximum number that can be parsed.
 
local ones = {
	[0] = '零',
	[1] = '一',
	[2] = '二',
	[3] = '三',
	[4] = '四',
	[5] = '五',
	[6] = '六',
	[7] = '七',
	[8] = '八',
	[9] = '九'
}
 
local specials = {
	[10] = '十',
	[20] = '二十',
	[30] = '三十',
	[40] = '四十',
	[50] = '五十',
	[60] = '六十',
	[70] = '七十',
	[80] = '八十',
	[90] = '九十',
	[100] = '一百'
}
 
local formatRules = {
	{num = 90, rule = '九十%s'},
	{num = 80, rule = '八十%s'},
	{num = 70, rule = '七十%s'},
	{num = 60, rule = '六十%s'},
	{num = 50, rule = '五十%s'},
	{num = 40, rule = '四十%s'},
	{num = 30, rule = '三十%s'},
	{num = 20, rule = '二十%s'},
	{num = 10, rule = '十%s'}
}
 
function p.main(frame)
	local args = getArgs(frame)
	local num = tonumber(args[1])
	local success, result = pcall(p._main, num)
	if success then
		return result
	else
		return string.format('<strong class="error">Error: %s</strong>', result) -- "result" is the error message.
	end
	return p._main(num)
end
 
function p._main(num)
	if type(num) ~= 'number' or math.floor(num) ~= num or num < 0 or num > max then
		error('input must be an integer between 0 and ' .. tostring(max), 2)
	end
	-- Check for numbers from 0 to 9.
	local onesVal = ones[num]
	if onesVal then
		return onesVal
	end
	-- Check for special numbers.
	local specialVal = specials[num]
	if specialVal then
		return specialVal
	end
	-- Construct the number from its format rule.
	onesVal = ones[num % 10]
	if not onesVal then
		error('Unexpected error parsing input ' .. tostring(num))
	end
	for i, t in ipairs(formatRules) do
		if num >= t.num then
			return string.format(t.rule, onesVal)
		end
	end
	error('No format rule found for input ' .. tostring(num))
end
 
return p
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