Modulus:bn-translit

Purpose

This module will transliterate text written in “Lingua Bengala”.

The module should preferably not be called directly from templates or other modules. To use it from a template, use {{xlit}}. Within a module, use Module:languages#Language:transliterate.

For testcases, see Module:bn-translit/testcases.

Functions

tr(text, lang, sc)

Transliterates a given piece of text written in the script specified by sc, and language specified by lang. When the transliteration fails, returns nil.

---

-- Transliteration for Bengali

local export = {}
local gsub = mw.ustring.gsub
local match = mw.ustring.match
 
local conv = {
	-- consonants
	['ক্ষ'] = 'kkh', ['জ্ঞ'] = 'gg',
	['ক'] = 'k',	['খ'] = 'kh',	['গ'] = 'g',	['ঘ'] = 'gh',	['ঙ'] = 'ṅ',
	['চ'] = 'c',	['ছ'] = 'ch',	['জ'] = 'j',	['ঝ'] = 'jh',	['ঞ'] = 'ñ',
	['ট'] = 'ṭ',	['ঠ'] = 'ṭh',	['ড'] = 'ḑ',	['ঢ'] = 'ḑh',	['ণ'] = 'ṇ',
	['ত'] = 't',	['থ'] = 'th',	['দ'] = 'd',	['ধ'] = 'dh',	['ন'] = 'n',
	['প'] = 'p',	['ফ'] = 'ph',	['ব'] = 'b',	['ভ'] = 'bh',	['ম'] = 'm',
	['য'] = 'y',	['র'] = 'r',	['ল'] = 'l',	['ৱ'] = 'w', 
	['শ'] = 'ś',	['ষ'] = 'ṣ',	['স'] = 's',	['হ'] = 'h',	
	['য়'] = 'y',	['ড়'] = 'ŗ',	['ঢ়'] = 'ŗh',

	-- visarga
	['ঃ'] = 'ḥ',

	-- vowel diacritics
	['ি'] = 'i',	['ু'] = 'u',	['ৃ'] = 'ri',	['ে'] = 'e',	['ো'] = 'o',
	['া'] = 'a',	['ী'] = 'i',	['ূ'] = 'u',	['ৈ'] = 'oi',	['ৌ'] = 'ou',

	-- vowel signs
	['অ'] = 'ô',	['ই'] = 'i',	['উ'] = 'u',	['ঋ'] = 'ri',	['এ'] = 'e',	['ও'] = 'o',
	['আ'] = 'a',	['ঈ'] = 'i',	['ঊ'] = 'u',	['ঐ'] = 'oi',	['ঔ'] = 'ou',

	--hôshôntô
	['্'] = '',

	-- chôndrôbindu
	['ঁ'] = 'ṁ',
		
	-- ônusbar
	['ং'] = 'N',

	-- khôndô tô
	['ৎ'] = 't',

	-- numerals
	['০'] = '0', ['১'] = '1', ['২'] = '2', ['৩'] = '3', ['৪'] = '4', ['৫'] = '5', ['৬'] = '6', ['৭'] = '7', ['৮'] = '8', ['৯'] = '9',
 
	-- punctuation
	['।'] = '.', -- dari
}

function export.tr(text, lang, sc)
	local c = '([কষজঞকখগঘঙচছজঝঞটঠডঢণতথদধনপফবভমযরলৱশষসহ]়?)'
	local y = 'য়'
	local r = 'র'
	local v = '([ô্িুৃেোাীূৈৌঅইউঋএওআঈঊঐঔ])'
	local virama = '্'
	local n = '(ং?)'
	
	local no_virama = mw.ustring.gsub(v,virama,"")
	
	text = text .. " "
	
	text = mw.ustring.gsub(text,c,"%1ô")
	text = mw.ustring.gsub(text,"ô"..v,"%1")
	mw.log(text)
	text = mw.ustring.gsub(text,v..n..c.."ô ",function(j,k,l) --ending
		return l==y and j..k..l.."ô " or j..k..l.." "
	end)
	mw.log(text)
	local pattern = v..n..c.."ô"..c .. no_virama
	local continue = true
	while continue do
		continue = false
		text = mw.ustring.gsub(text,"(.*)"..pattern,function(d,e,f,g,h,i)
			if g~=y and g~=r then
				continue = true
			end
			return (g==y or g==r) and d..e..f..g.."ô"..h..i or d..e..f..g..h..i
		end)
	end
	mw.log(text)
	
	text = mw.ustring.gsub(text,"([যডঢ]়)",conv)
	text = mw.ustring.gsub(text,"ক্ষ","kkh")
	text = mw.ustring.gsub(text,"জ্ঞ","gg")
	text = mw.ustring.gsub(text,".",conv)
	mw.log(text)
	
	text = mw.ustring.gsub(text,"ː(.)","%1%1")
	
	text = mw.ustring.gsub(text," ?।",".")
	
	text = mw.ustring.gsub(text,"([āēeo]y)ô ","%1 ")
	text = gsub(text,"ôN ","ôṁ ")
	text = gsub(text,"N","ng")
	
	text = mw.ustring.gsub(text," $","")
	
	return mw.ustring.toNFC(text)
end
 
return export