มอดูล:transliteration module testcases

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---

local library_util = require('libraryUtil')
local check_type = library_util.checkType
	
-- Allow examples to be a string in a sort of TSV format,
-- consisting of one or more lines with two or three non-empty arguments
-- separated by one or more tabs. Single-line Lua comments are stripped, as well as
-- whitespace at the beginning and end of each line.
-- Empty lines and lines consisting of whitespace are skipped.
local function examples_string_to_array(examples)
	examples = examples:gsub("%s*%-%-[^\n]*", "")
	local array = {}
	for line in examples:gmatch("[^\n]+") do
		line = mw.text.trim(line)
		if line ~= "" then
			local original, expected, sc = line:match("^([^\t]+)\t+([^\t]+)\t-([^\t]-)$")
			if not original then
				error("The following line did not consist of two or three arguments separated by tabs:\n"
					.. line)
			end
			if sc == "" then sc = nil end
			table.insert(array, { original, expected, sc })
		end
	end
	return array
end

local function _check(funcName, expectType)
	return function(argIndex, arg, expectType, nilOk)
		check_type(funcName, argIndex, arg, expectType, nilOk)
	end
end

local function get_translit_function(module_name)
	local success, translit_module = pcall(require, 'Module:' .. module_name)
	if not success then
		error('Error requiring Module:' .. module_name .. ': ' .. tostring(translit_module))
	end
	translit_function = translit_module.tr
	if type(translit_function) ~= 'function' then
		error('Module:' .. module_name .. ' does not contain a function \'tr\'.')
	end
	return translit_function
end

return function(translit_function, examples, sc_code, lang_code, options)
	local module_name
	if type(translit_function) == 'table' then
		local args = translit_function
		module_name, examples, sc_code, lang_code
			= args.module, args.examples, args.sc, args.lang
		
		options = {}
		for k, v in pairs(args) do
			if not (k == 'module' or k == 'examples' or k == 'sc' or k == 'lang') then
				options[k] = v
			end
		end
	elseif type(translit_function) == 'string' then
		module_name, translit_function = translit_function, nil
	end
	
	if module_name then
		translit_function = get_translit_function(module_name)
	end
	
	--  C H E C K   P A R A M E T E R S  --
	local check_type = _check('translit_module_testcases')
	check_type(1, translit_function, 'function')
	check_type(3, sc_code, 'string')
	check_type(4, lang_code, 'string')
	check_type(5, options, 'table', true)
	
	options = options or {}
	
	if type(examples) == "table" then
		if not require('Module:table').isArray(examples) then
			error('Third argument or "examples" argument to translit_module_testcases should be an array.')
		end
	elseif type(examples) == "string" then
		examples = examples_string_to_array(examples)
	else
		error('Third argument or "examples" argument to translit_module_testcases should be an array or string.')
	end
	
	-- Get canonical name and validate language code.
	local lang_object = require('Module:languages').getByCode(lang_code)
		or error('The language code ' .. lang_code .. ' is not valid.')
	local canonical_name = lang_object:getCanonicalName()
	
	-- Validate script code.
	if not mw.loadData('Module:scripts/data')[sc_code] then
		error('The script code ' .. sc_code .. ' is not valid.')
	end
	
	
	--  M A K E   T E S T   F U N C T I O N  --
	local tests = require('Module:UnitTests')
	
	local normalize = mw.ustring.toNFD
	
	local opening_tag = '<span class="' .. sc_code .. '" lang="' .. lang_code .. '">'
	local template
	if options.nolink then
		template = opening_tag .. '&</span>'
	else
		template = opening_tag .. '[[&#' .. canonical_name .. '|&]]</span>'
	end
	
	if options.func_with_link then
		format_text = options.func_with_link
		if type(format_text) ~= "function" then
			error("func_with_link in options table should be a function.")
		end
	elseif options.func_before_link then
		local func = options.func_before_link
		if type(func) ~= "function" then
			error("func_before_link in options table should be a function.")
		end
		function format_text(text)
			return template:gsub('&', (func(text)))
		end
	else
		function format_text(text)
			return template:gsub('&', text)
		end
	end
	
	local self_equals_options = { display = options.output_display }
	function tests:check(example, expected, manual_sc, manual_lang)
		ex_tr = translit_function(example, manual_lang or lang_code, manual_sc or sc_code)
				or 'NIL' -- Handle transliteration function returning nil, a valid function value.
		self:equals(format_text(example, expected, manual_sc, manual_lang),
			normalize(ex_tr),
			expected and normalize(expected),
			self_equals_options
		)
	end
	
	function tests:test()
		self:iterate(examples, 'check')
	end
	
	if module_name then
		tests["testcases for <code>tr</code> function in [[Module:" .. module_name .. "]]"], tests.test
			= tests.test, nil
	end
	
	return tests
end