模組:Hani-sortkey

可在模組:Hani-sortkey/doc建立此模組的說明文件

local export = {}

local cp = mw.ustring.codepoint
local concat = table.concat
local explode_utf8 = require("Module:string utilities").explode_utf8
local insert = table.insert
local namespace = mw.title.getCurrentTitle().nsText
local m_data = require("Module:Hani-sortkey/data/serialized")
local radicals_start = m_data:find("\254")
local preconvert_start = m_data:find("\255", radicals_start)

local pe = require("Module:utilities").pattern_escape

local function log(...)
	if namespace == "Module" then
		mw.log(...)
	end
end

--[[
	The number of characters or ideographic sequences that must follow each
	ideographic description character.
]]
local IDchars = {
	["⿰"] = 2,	-- left-to-right
	["⿱"] = 2,	-- above-to-below
	["⿲"] = 3,	-- left-to-middle and right
	["⿳"] = 3,	-- above-to-middle and below
	["⿴"] = 2,	-- full surround
	["⿵"] = 2,	-- surround from above
	["⿶"] = 2,	-- surround from below
	["⿷"] = 2,	-- surround from left
	["⿸"] = 2,	-- surround from upper left
	["⿹"] = 2,	-- surround from upper right
	["⿺"] = 2,	-- surround from lower left
	["⿻"] = 2,	-- overlaid
	["⿼"] = 2,	-- surround from right
	["⿽"] = 2,	-- surround from lower right
	["⿾"] = 1,	-- horizontal reflection
	["⿿"] = 1,	-- rotation
	["㇯"] = 1	-- subtraction
}

--[[
	Returns the index in the string where the ideographic description sequence
	(IDS) ends, or the index of the end of the string. Iterates whenever
	another ideographic description character (IDC) is found.
]]
local function findEndOfIDS(text, IDchar, i)
	if not (text and IDchar and i) then
		return nil
	end
	
	local j = i
	local component = 1
	
	-- Number of components expected after current IDC.
	local components = IDchars[IDchar]
	
	while component <= components do
		j = j + 1
		
		local char = text[j]
		
		if not char then
			break
		elseif IDchars[char] then
			j = findEndOfIDS(text, char, j)
		end
		
		component = component + 1
	end
	
	--[[
		If the expected number of components has been found,
		return the current index in the text.
	]]
	if component - components == 1 then
		return j
	else
		return nil
	end
end

local module_cache = {}

local function radical_lookup(b)
	local lookup = 3 * b:byte() + radicals_start
	return m_data:sub(lookup - 2, lookup)
end

-- The data is stored in [[Module:Hani-sortkey/data]]. This data is not accessed directly (due to the large amount of memory this would consume), but is instead stored in a serialized form as [[Module:Hani-sortkey/data/serialized]]. If the data is changed, the new serialized data can be generated with [[Module:Hani-sortkey/data/serializer]].
function export.getData(char, returnModule)
	if type(char) == "string" then
		char = cp(char)
	elseif type(char) ~= number then
		error("getData must operate on a single character or codepoint.")
	end
	local sections = {
		{0x3007, 0x3007},
		{0x3400, 0x4DBF},
		{0x4E00, 0x9FFF},
		{0xF900, 0xFA6D},
		{0xFA70, 0xFAD9},
		{0x20000, 0x2A6DF},
		{0x2A700, 0x2B739},
		{0x2B740, 0x2B81D},
		{0x2B820, 0x2CEA1},
		{0x2CEB0, 0x2EBE0},
		{0x2EBF0, 0x2EE5D},
		{0x2F800, 0x2FA1D},
		{0x30000, 0x3134A},
		{0x31350, 0x323AF}
	}
	local section_offset = 0
	for k, v in ipairs(sections) do
		if char > v[2] then
			section_offset = section_offset + v[2] - v[1] + 1
		elseif char >= v[1] and char <= v[2] then
			local lookup = 3 * (section_offset + char - sections[k][1] + 1)
			return m_data:sub(lookup - 2, lookup):gsub("^.", radical_lookup)
		end
	end
	return mw.ustring.char(char)
end

local unsupported_data

function export.makeSortKey(text, lang, sc)
	local scripts = {
		Hani = true,
		Hans = true,
		Hant = true,
		Jpan = true,
		Kore = true
	}
	if sc and not scripts[sc] then
		return text:uupper()
	end
	
	local sort = {}
	text = explode_utf8(text)
	local text_len = #text
	local i, char = 0
	while i < text_len do
		i = i + 1
		char = text[i]
		
		char = (m_data:match("%f[^\2\255]" .. pe(char) .. "\1([^\2]+)\2", preconvert_start)) or char
		--[=[
			If we encounter an ideographic description character (IDC),
			find out if it begins a valid ideographic description sequence (IDS).
			
			If the IDS is valid and a sortkey for it is listed in
			[[Module:Hani-sortkey/data/unsupported]], then return
			the sortkey, and move to the next character after the
			IDS.
			
			Otherwise, insert the IDC into the sortkey and move to the next
			character after the IDC.
			
			If the IDS is valid and no sortkey for it is found, track it.
		]=]
		if IDchars[char] then
			local j = findEndOfIDS(text, char, i)
			local IDS, data
			if j then
				IDS = concat(text, nil, i, j)
				unsupported_data = unsupported_data or mw.loadData("Module:Hani-sortkey/data/unsupported")
				data = unsupported_data[IDS]
			end
			
			if not data then
				if IDS then
					require("Module:debug").track("Hani-sortkey/IDS-without-sortkey")
					mw.log("ideographic description sequence without sortkey: '"
						.. IDS .. "'")
				else
					require("Module:debug").track("Hani-sortkey/invalid-IDS")
					mw.log("invalid ideographic description sequence at the beginning of '"
						.. text[i] .. "'")
				end
			end
			if IDS and data then
				insert(sort, data)
				i = j
			else
				insert(sort, char)
			end
		else
			insert(sort, export.getData(char) or char)
		end
	end
	
	return concat(sort)
end

return export