1 module nxt.languages;
2 
3 @safe pure:
4 
5 import nxt.conv_ex : toDefaulted;
6 
7 /** Language Code according to ISO 639-1 plus computer languages.
8  *
9  * See_Also: https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes
10  * See_Also: http://www.mathguide.de/info/tools/languagecode.html
11  * See_Also: http://msdn.microsoft.com/en-us/library/ms533052(v=vs.85).aspx
12  */
13 enum Lang
14 {
15     unknown,
16     nullValue = unknown,        // `FlatHashMap` null support
17     holeValue,                  // `FlatHashMap` hole support
18 
19     en, english = en,            /// English
20     en_US, american_english = en_US,    /// American. English
21     en_GB, british_english = en_GB,     /// British English
22     en_CA, canadian_english = en_CA,    /// Canadian English
23     // ac,                       /// TODO?
24     // ace,                      /// TODO?
25     // ai,                       /// TODO?
26     // ain,                       /// TODO?
27     af, afrikaans = af, afr = afrikaans, /// Afrikaans
28     ar, arabic = ar,                       /// Arabic
29     // ary,                       /// TODO?
30     // arc,                       /// TODO?
31     ae, avestan = ae,                       /// Avestan Iran (extinct)
32     ak, akan = ak,                       /// Akan
33     // akk,                      /// TODO?
34     an, aragonese = an,     /// Aragonese
35     // ang,                       /// TODO?
36     as, assamese = as,            /// Assamese
37     // ase,                       /// TODO?
38     // ast,                       /// TODO?
39     // ax,                       /// TODO?
40     az, azerbaijani = az, azeri = azerbaijani,                       /// Azerbaijani (Azeri)
41     hy, armenian = hy,                       /// Armenian: Armenia
42     eu, basque = eu,                       /// Basque: Spain, France
43     ba, baskhir = ba,                       /// Baskhir: Volga, Urals, Central Asia
44     // ban,                      /// TODO?
45     be, belarusian = be,                       /// Belarusian
46     // bj,                       /// TODO?
47     bn, bengali = bn,                      /// Bengali (Bangla): Bangladesh, India
48     br, breton = br,                      /// Breton: France
49     bs, bosnian = bs,                      /// Bosnian
50     bg, bulgarian = bg, bul = bulgarian,                      /// Bulgarian
51     bo, tibetan = bo,                      /// Tibetan
52     // bp,                       /// TODO?
53     // bt,                       /// TODO?
54     my, burmese = my,                      /// Burmese: Myanmar
55     zh, chinese = zh,                      /// Chinese (Mandarin, Putonghua): China, Singapore
56     crh, crimean = crh,                     /// Crimean Tatar
57     hr, croatian = hr,                      /// Croatian: Croatia
58     // cr,                       /// TODO?
59     ca, catalan = ca, valencian = catalan, cat = valencian,                     /// Catalan/Valencian (Spain)
60     cy, welch = cy, welsh = welch, cym = welsh,                     /// Welch: Wales, Heddwch, Tangnefedd
61     cs, czech = cs, ces = czech,                      /// Czech: Czech Republic
62     // csb,                      /// TODO?
63     da, danish = da, dan = danish,                      /// Danish: Denmark, Greenland
64     // ds,                       /// TODO?
65     // dsb,                      /// TODO?
66     nl, dutch = nl, flemish = dutch,                      /// Dutch (Flemish): Netherlands, Belgium
67     eo, esperanto = eo,                      /// Esperanto
68     et, estonian = et,                      /// Estonian
69     fi, finnish = fi, fin = finnish,                      /// Finnish: Finland, Sweden, Russia
70     fj, fijian = fj,                      /// Fijian: Fiji
71     fo, faroese = fo,                      /// Faroese (Faeroese): Faroe Islands
72     // fu,                       /// TODO?
73     fr, french = fr, fra = french,                      /// French: France, Belgium, Canada, Caribbean, West Africa, Polynesia
74     fr_ch, swiss_french,                    /// French (Switzerland)
75     gl, galician = gl, gallegan = galician,                      /// Galician (Gallegan): Spain, Portugal
76     gv, manx = gv,                      /// Manx: Isle of Man
77     de, german = de, deu = german,                      /// German: Germany, Austria, Switzerland, Liechtenstein, Italy, Belgium
78     el, greek = el, ell = greek,     /// Greek: Greece, Cyprus
79     ha, hausa = ha,                      /// Hausa: Nigeria
80     haw, hawaiian = haw,                     /// Hawaiian: Hawaii
81     he, hebrew = he,                      /// Hebrew: Israel
82     // hs,                       /// TODO?
83     // hsb,                      /// TODO?
84     hi, hindi = hi,                      /// Hindi: India, Nepal, Uganda, Suriname
85     hu, hungarian = hu,                      /// Hungarian: Hungary, Romania, Slovakia
86     is_, icelandic = is_,                     /// Icelandic
87     io, ido = io,                      /// Ido: Nigeria
88     id, indonesian = id,                      /// Indonesian (Bahasa): Indonesia
89     ga, irish = ga,                      /// Irish: Ireland
90     it, italian = it, ita = italian,                      /// Italian: Italy, Switzerland
91     ja, japanese = ja,                      /// Japanese, 日本語: Japan
92     ka, georgian = ka,                      /// Georgian: Georgia
93     ku, kurdish = ku,                      /// Kurdish: Kurdistan (Turkey, Syria, Iran, Iraq)
94     kn, kannada = kn,                      /// Kannada: India
95     kk, kazakh = kk,                      /// Kazakh: Kazakhstan
96     km, khmer = km,                      /// Khmer: Cambodia
97     ko, korean = ko,                      /// Korean: Korea
98     ky, kirghiz = ky, kyrgyz = kirghiz,                      /// Kirghiz (Kyrgyz): Kirghizstan, China
99     lo, lao = lo,                      /// Lao: Laos
100     la, latin = la, lat = latin,                      /// Latin: Rome (extinct)
101     lt, lithuanian = lt,                      /// Lithuanian: Lithuania
102     lv, latvian = lv,                      /// Latvian: Latvia
103     jbo, /// lojban = jbo,                     /// Lojban
104     mk, macedonian = mk,                      /// Macedonian: Macedonia
105     nan, southern_min = nan, min_nan = southern_min,                    /// Min Nan: https://en.wikipedia.org/wiki/Southern_Min
106     mg, malagasy = mg, malgache = malagasy,                    /// Malagasy (Malgache): Madagascar
107     mn, mongolian = mn,                      /// Mongolian: Mongolia
108     ms, malay = ms, zsm = malay,             /// Malay: Malaysia
109     mt, maltese = mt,                      /// Maltese: Malta
110     ne, nepali = ne,                      /// Nepali: Nepal
111     no, norwegian = no, nob = norwegian,  /// Norwegian: Norway
112     ps, pashto = ps,                      /// Pashto: Afghanistan, Iran, Pakistan
113     fa, persian = fa, farsi = persian,                     /// Persian (Farsi): Iran, Iraq, Afghanistan, Pakistan, Azerbaijan
114     oc, occitan = oc,                      /// Occitan (Provençal, Languedocian): France
115     pl, polish = pl,                      /// Polish
116     pt, portuguese = pt, por = portuguese,                     /// Portuguese: Portugal, Brazil, Angola, Mozambique, Cape Verde, Guinea-Bissau
117     pt_BR, brazilian_portuguese = pt_BR,                    /// Brazilian Portuguese
118     ro, romanian = ro,                      /// Romanian: Romania, Hungary
119     ru, russian = ru, rus = russian,                      /// Russian
120     sa, sanskrit = sa,                      /// Sanskrit: India (extinct, liturgical)
121     // sc,                    /// TODO?
122     // scn,                   /// TODO?
123     si, sinhalese = si,                      /// Sinhalese: Sri Lanka
124     sm, samoan = sm,                      /// Samoan: Samoa
125     sco, scots = sco,                     /// Scots: Scotland
126     sq, albanian = sq,                      /// Albanian: Albania, Kosovo
127     // se,                       /// TODO?
128     // sy,                       /// TODO?
129     // syc,                       /// TODO?
130     te, telugu = te,                      /// Telugu: India
131     tl, tagalog = tl, pilipino = tagalog,                      /// Tagalog (Pilipino): Philippines
132     // tp,                       /// TODO?
133     // tpi,                       /// TODO?
134     gd, scottish_gaelic = gd,                      /// Scottish Gaelic: Scotland
135     sr, serbian = sr,                      /// Serbian: Serbia, Montenegro, Bosnia
136     sk, slovak = sk, slk = slovak,         /// Slovak: Slovak Republic
137     sl, slovene = sl, slovenian = slovene, slv = slovenian, /// Slovene, Slovenian: Slovenia, Austria, Italy
138     es, spanish = es, spa = spanish,                      /// Spanish
139     // es_ar, spanishArgentina = es_ar,
140     // es_bo, spanishBolivia = es_bo,
141     sw, swahili = sw, swa = swahili, /// Swahili: East Africa
142     sv, swedish = sv, swe = swedish,                       /// Swedish
143     asv, ancientSwedish = asv,                       /// Ancient Swedish
144     tg, tajik = tg,                      /// Tajik: Tajikistan, Afghanistan
145     ta, tamil = ta, tam = tamil,         /// Tamil: India
146     th, thai = th, tha = thai,                      /// Thai: Thailand
147     tr, turkish = tr, tur = turkish,                /// Turkish: Turkey, Cyprus
148     tk, turkmen = tk,                      /// Turkmen: Turkmenistan, Afghanistan
149     uk, ukrainian = uk, ukr = ukrainian,   /// Ukrainian
150     ur, urdu = ur,                      /// Urdu: Pakistan, India, Central Asia
151     uz, uzbek = uz,                      /// Uzbek: Uzbekistan, Central Asia, China
152     vi, vietnamese = vi, vie = vietnamese, /// Vietnamese: Viet Nam
153     vo, volapuk = vo,                      /// Volapük
154     wa, waloon = wa, wln = waloon,         /// Waloon: Belgium
155     yi, yiddish = yi, yid = yiddish, /// Yiddish: Israel, USA, Russia
156 
157     aa, afar = aa,/// Afar	Ethiopia, Eritrea, Djibouti	Salaamata
158     ab, abkhaz = ab,/// Abkhaz	Caucasus	needed!
159     afa, luganda = afa,/// Luganda	Uganda	Emirembe
160     akk, akkadian = akk,/// Akkadian	Mesopotamia (extinct)	(Salmu)
161     alg, abenaki = alg,/// Abenaki	North America	Okikiamgenoka, Kamignokawôgan
162     am, amharic = am,/// Amharic	Ethopia, Egypt	ሰላም (salām)
163     ang, /// Anglo Saxon (Old English)	England (extinct)	ᚠᚱᛁᚦ (friþ), Frið
164     arw, arawak = arw,/// Arawak	Suriname, Guyana, Venezuela	needed!
165     arc, aramaic = arc,/// Aramaic (Syriac, Assyrian)	Iraq, Iran, Syria, and liturgical	ܫܠܡܐ (shlamaa)
166     arn, mapundungun = arn,/// Mapundungun	Chile	Uvchin, Tügkülen
167     art, /// lojban = art,/// Lojban	 	panpi
168     ast, asturian = ast,/// Asturian	Spain	Paz
169     at, haiti_creole = at, kreyol = haiti_creole, /// Haiti / Guiana Creole (Kreyol)	Caribbean	Lapè
170     aus, olkola = aus,/// Olkola	Australia	Erray
171     /// aus, /// Pintupi-Luritja	Australia	Yatanpa
172     /// aus, /// Wagiman	Australia	Nyimbur-ma
173     /// aus, /// Warlpiri	Australia	Iawa-nyinami
174     av, avar = av,/// Avar	Caucasus	Рекъел (reqel)
175     ay, aymara = ay,/// Aymara	Bolivia	Hacaña
176     bai, dschang = bai, yemba = dschang, /// Dschang (Yemba)	Cameroon	Mbwɛ´né
177     bas, basaa = bas,/// Basaa	Cameroon	SàN
178     bat, old_prussian = bat, sudovian = old_prussian, jatvingian = sudovian, /// Old Prussian, Sudovian (Jatvingian)	Baltic (extinct)	Pakajan
179     btk, batak = btk,/// Batak	Indonesia	Pardamean
180     bem, bemba = bem,/// Bemba	Zambia	Mutenden, Ukwikala mu
181     bh, bihari = bh,/// Bihari	India	needed!
182     bi, bislama = bi,/// Bislama	Vanuatu	Pís
183     bla, blackfoot = bla,/// Blackfoot	North America	Innaihtsi'iyi
184     bm, bambara = bm,/// Bambara	Mali	Here, Errébé
185     cai, /// Ch'ol (Tumbalá)	Chiapas (Mexico)	Ñʌch'chocoya
186     car, caribe = car,/// Caribe	Venezuala, Suriname	needed!
187     ce, chechen = ce,/// Chechen	Chechnya (Caucasus)	Машар (mashar)
188     ceb, cebuano = ceb,/// Cebuano	Philippines	Kalinaw, Kahusayan
189     ch, chamorro = ch,/// Chamorro	Guam	Minaggen
190     cho, choctaw = cho,/// Choctaw	North America	Achukma
191     chk, chuuk = chk,/// Chuuk	Truk	Kunammwey
192     chr, cherokee = chr,/// Cherokee (Tsalagi)	North America	ᏙᎯᏱ (dohiyi)
193     chy, cheyenne = chy,/// Cheyenne	North America	Nanomonsetôtse
194     co, corsican = co,/// Corsican	Corsica (France)	Pace
195     cop, coptic = cop,/// Coptic	Egypt (extinct) and liturgical	Ϩιρηνη (hirīnī)
196     cpe, /// Afro-Seminole	North America	needed!
197     cpf, cajun_french = cpf, acadian = cajun_french, /// Cajun French (Acadian, Kreyol Lwiziyen)	Louisiana (USA)	needed!
198     cr, cree = cr,/// Cree	North America	Wetaskiwin, Papayatik
199     crp, fanagolo = crp,/// Fanagolo	South Africa	Kutula
200     cu, /// Old Church Slavonic	Eastern Europe (liturgical)	Ми́ръ (mírə)
201     cv, chuvash = cv,/// Chuvash	Russia	needed!
202     del, lenape = del,/// Lenape (Delaware)	North America	Achwangundowagan
203     dua, duala = dua,/// Duala	Cameroon	Musango
204     dra, brahui = dra,/// Brahui	Pakistan, Afghanistan, Iran	(âsûdaî)
205     dv, divehi = dv,/// Divehi (Maldivian)	Maldives	ސުޅަ (sulha)
206     dz, dzongkha = dz,/// Dzongkha	Bhutan	གཞི་བདེ (gzhi-bde)
207     ee, ewe = ee,/// Ewe (Évé)	West Africa	Ŋutifafa
208     efi, efik = efi,/// Efik	Nigeria	Emem
209     enm, middle_english = enm, /// Middle English	England (extinct)	Pes, Pise, Pees, ...
210     ff, fula = ff, falani = fula, /// Fula (Falani)	West Africa	Jam
211     fiu, karelian = fiu,/// Karelian	Russia, Finland	Rauhu, Vienosti
212     fon, benin = fon,/// Fon	Benin	Fifâ
213     fro, /// Old French	France	Pais
214     fur, friulian = fur, frulan = friulian, /// Friulian (Frulan)	Friuli (Italy)	Pâs
215     fy, frisian = fy,/// Frisian	Germany, Netherlands	Frede
216     gez, /// Ge'ez	Ethiopia, Eritrea (liturgical)	ሰላም (salām)
217     gmh, /// Middle High German	Central Europe (extinct)	Vride
218     gn, guarani = gn,/// Guarani	Bolivia, Paraguay, Brazil	Apĭrĭvé, Ñerane'i, Py'aguapy
219     goh, /// Old High German	Central Europe (extinct)	Fridu
220     got, gothic = got,/// Gothic	Central Europe (extinct)
221     grc, ancient_greek = grc,/// Ancient Greek	Miditerranean (extinct) and liturgical	Εἰρήνη (eirḗnē)
222     gu, gujarati = gu,/// Gujarati	India, Pakistan	શાંતિ (śānti)
223     hil, hiligaynon = hil,/// Hiligaynon (Ilongo)	Philippines	Paghidait
224     hmn, hmong = hmn,/// Hmong	China, Viet Nam, Laos, Thailand	Kev tiaj tus
225     ho, hiri_motu = ho,/// Hiri Motu	Papua New Guinea	Taim billong sikan
226     hz, herero = hz,/// Herero	Southern Africa	needed!
227     ia, interlingua = ia,/// Interlingua	 	Pace
228     ie, interlingue = ie,/// Interlingue	 	Pace
229     ig, igbo = ig,/// Igbo (Ibo)	Nigeria	Udo
230     ii, sichuan_yi = ii,/// Sichuan Yi	China	ꄮꐽ (te-njo)
231     in_,
232     ik, /// Iñupiaq	Alaska	Kiñuiñak, Tutqiun
233     ilo, ilocano = ilo,/// Ilocano	Philippines	Kappia
234     inh, ingush = inh,/// Ingush	Ingutia (Caucasus)	Машар (mashar)
235     iu, inuktitut = iu,/// Inuktitut	Canada	ᓴᐃᒻᒪᓯᒪᓂᖅ (saimmasimaniq)
236     jpr, /// Judeo-Persian (Bukharic)	Mideast, Central Asia	needed!
237     jrb, /// Judeo-Arabic	Mideast, North Africa	needed!
238     jv, javanese = jv,/// Javanese	Indonesia	Rukun
239     kab, kabyle = kab,/// Kabyle	Algeria	Lahna
240     kg, kongo = kg,/// Kongo	Congo	Kikœndi
241     ki, kikuyu = ki, gikuyu = kikuyu, /// Kikuyu (Gikuyu)	Kenya	Thayu
242     kj, kwanyama = kj, kuanyama = kwanyama, /// Kwanyama (Kuanyama)	Angola, Namibia	needed!
243     kl, greenlandic = kl, kalaallisut = greenlandic, /// Greenlandic (Kalaallisut)	Greenland	Irqigsiniq, Erĸigsineĸ
244     kos, kosraean = kos,/// Kosraean	Micronesia	Mihs
245     kr, kanuri = kr,/// Kanuri	Niger, Nigeria	needed!
246     ks, kashmiri = ks,/// Kashmiri	Kashmir (India, Pakistan)	امن (amn)
247     kv, komi = kv,/// Komi	Russian Arctic	needed!
248     kw, cornish = kw,/// Cornish	Cornwall (extinct)	Cres
249     lad, ladino = lad,/// Ladino (Judeo-Spanish)	Turkey, Israel, North Africa	Pas, פאש
250     lb, luxemburgish = lb,/// Luxemburgish (Lëtzebuergesch)	Luxembourg	Fridd, Fridden
251     lg, ganda = lg,/// Ganda	Niger, Congo	needed!
252     li, limburgan = li,/// Limburgan (Limburgish)	Belgium	Vreij
253     ln, lingala = ln,/// Lingala	Congo	Kímía
254     lol, mongo_nkundu = lol,/// Mongo-Nkundu	Congo	Bóoto
255     loz, lozi = loz,/// Lozi	Zambia	Nala
256     lu, luba_katanga = lu,/// Luba-Katanga	Niger, Congo	needed!
257     man, mandinka = man,/// Mandinka	Senegal, Gambia, Guinea-Bissau	Kayiroo
258     map, bisaya = map,/// Bisaya	Brunei	Kalinaw
259     mh, marshallese = mh,/// Marshallese	Marshall Islands	Ainemon
260     mi, maori = mi,/// Maori	New Zealand	Rangima'arie, Nohopuku, Rongo
261     mic, micmac = mic,/// Micmac	North America	Wôntôkóde
262     mis, ainu = mis,/// Ainu	Japan	アプンノ, あぷんの (apunno)
263     ml, malayalam = ml,/// Malayalam	India	സമാധാനം (samaadhaanam)
264     mno, manobo = mno,/// Manobo	Philippines	Linew
265     mo, moldavian = mo,/// Moldavian (Moldavan)	Moldava	Pace, Паче (pace)
266     mos, mossi = mos,/// Mossi (Moré)	Burkina Faso	Lâfí
267     mr, marathi = mr,/// Marathi	India	शांतता (śāntātā), शांती (śāntī)
268     mus, muskogee = mus,/// Muskogee (Creek)	North America	Ittimokla
269     myn, kekchi = myn,/// Kekchi	Guatemala, Belize	Tuktuquil usilal
270     na, nauruan = na,/// Nauruan	Nauru	Iow
271     nah, /// Náhuatl (Aztec)	Mexico, Guatemala	Tlamatcanemiliztli, Mocehuia
272     nd, north_ndebele = nd,/// North Ndebele	Zimbabwe	needed!
273     nds, old_saxon = nds, saxony = old_saxon, /// Old Saxon	Saxony (extinct)	Friðu
274     ng, ndonga = ng,/// Ndonga	Angola, Namibia	needed!
275     non, old_norse = non,/// Old Norse	Scandinavia (extinct)	ᚠᚱᛁᚦᚱ, Friðr
276     nr, south_ndebele = nr,/// South Ndebele	Zimbabwe, Botswana	needed!
277     nv, navajo = nv,/// Navajo (Navaho)	North America	K'é, Hozo
278     ny, chichewa = ny,/// Chichewa (Chewa, Nyanja)	Malawi	M'tendere
279     // om, oromo = om,/// Oromo	Ethiopia, Kenya	Nagaya, ነገየ (nagaya)
280     or, oriya = or,/// Oriya	India	needed!
281         // os, ossetic = os, ossetian = ossetic, /// Ossetic (Ossetian)	Georgia, Russia	needed!
282     oto, otomi = oto,/// Otomi	Mexico	Hmetho
283     pa, panjabi = pa, punjab = panjabi, /// Panjabi (Punjab)	Pakistan, India	ਸ਼ਾਂਤੀ (śānti)
284     // paa, /// Ekari	Indonesia	Muka-Muka
285     // pag, /// Pangasinan	Philippines	Kareenan
286     // pam, /// Pampangan (Kapampangan)	Philippines	Kapayapan
287     // pap, /// Papiamentu	Netherlands Antilles	Pas
288     // pau, /// Palauan	Palau	Búdech
289     // pi, /// Pali	India	Sāma, Santi
290     // qu, /// Quechua	Peru	Anka Kay, Qasikay, Aligu, Sonqo Tiaykuy
291     // rap, /// Rapanui	Chile	Kiba-kiba, Pava
292     // rm, /// Raeto-Romance (Romansch)	Switzerland	Pasch
293     // rn, /// Rundi (Kirundi, Urundi)	Burundi	Amahoro
294     // rom, /// Romany (Gypsy, Tsigane)	Europe, South America, etc	Smirom
295     // rw, /// Kinyarwanda (Rwanda, Ruanda)	Rwanda	Nimuhóre, Amahoro
296     // sd, /// Sindhi	Pakistan, India	शांति, شانت (śanti)
297     // sg, /// Sango	Central African Republic	needed!
298     // sn, /// Shona	Zimbabwe	Runyaro, Dendemaro
299     // so, /// Somali	Somalia, Djibouti, Ethiopia	Nabáda
300     // ss, /// Swati (Siswati)	Swaziland	Kuthála
301     // st, /// Southern Sotho (Sesotho, Sesuthu)	South Africa	Kgotso, Khotso
302     // su, /// Sundanese	Indonesia	needed!
303     // ti, /// Tigrinya (Tigrigna)	Eritrea	ሰላም (salām)
304     // tli, /// Tlingit	North America	Li-k'ei
305     // tn, /// Tswana (Setswana)	Botswana	Khotso, Kagiso
306     // to, /// Tonga	Zambia	Malino, Melino
307     // ts, /// Tsonga	South Africa	needed!
308     // tt, /// Tatar	Russia	Тынычлык (tınıçlık)
309     // tw, /// Twi	West Africa	Asomdwee
310     // ty, /// Tahitian	Tahiti	Hau
311     // ug, /// Uighur (Uygur)	China, Central Asia	تىنچلىق (tinçlik)
312     // ve, /// Venda	South Africa	needed!
313     // wen, /// Upper Sorbian (Wendish)	Germany	Pokoj
314     // wo, /// Wolof	West Africa	Jàmm
315     // xh, /// Xhosa	South Africa, Botswana	Uxolo
316     // yo, /// Yoruba	Nigeria, Benin, Togo	Alaáfía
317     // ypk, /// Yu'pik	Alaska, Canada	Kiñuiñak
318     // za, /// Chuang (Zhuang)	China	needed!
319     // zap, /// Zapotec	Mexico	Layeni, Binlo
320     // zu, /// Zulu	Southern Africa	Isithangami, Ukuthula
321 
322     /** International Phonetic Alphabet (IPA)
323         https:///en.wikipedia.org/wiki/International_Phonetic_Alphabet */
324     ipa,
325 
326     /// Programming Languages.
327     c, firstFormal = c,
328     cxx,
329     objectiveC,
330     objectiveCxx,
331     cSharp,
332     d,
333     go,
334     java,
335     ada,
336     rust,
337     swift,
338     fortran,
339     modelica,
340 
341     lastFormal = modelica,
342 
343     /// Academic Languages
344     math,                /// "Mathematics is the only truly universal language"
345     physics,
346 
347     regularExpression, regexp = regularExpression,
348 }
349 // pragma(msg, cast(uint)Lang.regularExpression);
350 
351 /** Return true if programming language $(D lang) is case-sensitive. */
352 pragma(inline, true)
353 bool isCaseSensitive(in Lang lang) @safe pure @nogc nothrow
354 	=> !(lang == Lang.bg ||
355 		 lang == Lang.ada);
356 
357 /** Return true if $(D lang) is a formal (computer) language. */
358 pragma(inline, true)
359 bool isFormal(in Lang lang) @safe pure @nogc nothrow
360 	=> (lang >= Lang.firstFormal &&
361 		lang <= Lang.lastFormal);
362 
363 /** TODO: Remove when `__traits(documentation)` is merged
364  */
365 string toSpoken(in Lang lang, in Lang spokenLang = Lang.init) @safe pure nothrow // TODO: @nogc
366 {
367     with (Lang)
368     {
369         switch (lang)
370         {
371         case unknown: return `??`;
372         case en: return `English`; // 英語
373         case en_US: return `American English`;
374         case en_GB: return `British English`;
375         case en_CA: return `Canadian English`;
376         case af: return `Afrikaans`;
377         case ar: return `Arabic`;
378         case ae: return `Avestan`;
379         case ak: return `Akan`;
380         case an: return `Aragonese`;
381         case as: return `Assamese`;
382         case az: return `Azerbaijani`;
383         case hy: return `Armenian`;
384         case eu: return `Basque`;
385         case ba: return `Baskhir`;
386         case be: return `Belarusian`;
387         case bn: return `Bengali`;
388         case br: return `Breton`;
389         case bs: return `Bosnian`;
390         case bg: return `Bulgarian`;
391         case bo: return `Tibetan`;
392         case my: return `Burmese`;
393         case zh: return `Chinese Mandarin`;
394         case crh: return `Crimean Tatar`;
395         case hr: return `Croatian`;
396         case ca: return `Catalan`;
397         case cy: return `Welch`;
398         case cs: return `Czech`;
399         case da: return `Danish`;
400         case nl: return `Dutch`;
401         case eo: return `Esperanto`;
402         case et: return `Estonian`;
403         case fi: return `Finnish`;
404         case fj: return `Fiji`;
405         case fo: return `Faroese`;
406         case fr: return `French`;
407         case fr_ch: return `French (Switzerland)`;
408         case gl: return `Galician`;
409         case gv: return `Manx`;
410         case de: return `German`;
411         case el: return `Greek`;
412         case grc: return `Ancient Greek`;
413         case ha: return `Hausa`;
414         case he: return `Hebrew`;
415         case hi: return `Hindi`;
416         case hu: return `Hungarian`;
417         case is_: return `Icelandic`;
418         case io: return `Ido`;
419         case id: return `Indonesian`;
420         case ga: return `Irish`;
421         case it: return `Italian`;
422         case ja: return `Japanese`; // 日本語
423         case ka: return `Georgian`;
424         case ku: return `Kurdish`;
425         case kn: return `Kannada`;
426         case kk: return `Kazakh`;
427         case km: return `Khmer`;
428         case ko: return `Korean`;
429         case ky: return `Kyrgyz`;
430         case lo: return `Lao`;
431         case la: return `Latin`;
432         case lt: return `Lithuanian`;
433         case lv: return `Latvian`;
434         case jbo: return `Lojban`;
435         case mk: return `Macedonian`;
436         case nan: return `Min Nan`;
437         case mg: return `Malagasy`;
438         case mn: return `Mongolian`;
439         case ms: return `Malay`;
440         case mt: return `Maltese`;
441         case ne: return `Nepali`;
442         case no: return `Norwegian`;
443         case ps: return `Pashto`;
444         case fa: return `Persian`;
445         case oc: return `Occitan`;
446         case pl: return `Polish`;
447         case pt: return `Portuguese`;
448         case pt_BR: return `Brazilian Portuguese`;
449         case ro: return `Romanian`;
450         case ru: return `Russian`;
451         case sa: return `Sanskrit`;
452         case si: return `Sinhalese`;
453         case sm: return `Samoan`;
454         case sco: return `Scots`;
455         case sq: return `Albanian`;
456         case te: return `Tegulu`;
457         case tl: return `Tagalog`;
458         case gd: return `Scottish Gaelic`;
459         case sr: return `Serbian`;
460         case sk: return `Slovak`;
461         case sl: return `Slovene`;
462         case es: return `Spanish`;
463         case sw: return `Swahili`;
464         case sv: return `Swedish`;
465         case asv: return `Ancient Swedish`;
466         case tg: return `Tajik`;
467         case ta: return `Tamil`;
468         case th: return `Thai`;
469         case tr: return `Turkish`;
470         case tk: return `Turkmen`;
471         case uk: return `Ukrainian`;
472         case ur: return `Urdu`;
473         case uz: return `Uzbek`;
474         case vi: return `Vietnamese`;
475         case vo: return `Volapük`;
476         case wa: return `Waloon`;
477         case yi: return `Yiddish`;
478         case akk: return `Akkadian`;
479         case ce: return `Chechen`;
480         case co: return `Corsican`;
481         case fur: return `Friulian`;
482         case gu: return `Gujarati`;
483         case hil: return `Hiligaynon`;
484         case haw: return `Hawaiian`;
485 
486         case ipa: return `International Phonetic Alphabet`;
487 
488         case c: return `C`;
489         case cxx: return `C++`;
490         case cSharp: return `C#`;
491         case objectiveC: return `Objective-C`;
492         case objectiveCxx: return `Objective-C++`;
493         case d: return `D`;
494         case go: return `Go`;
495         case java: return `Java`;
496         case ada: return `Ada`;
497         case rust: return `Rust`;
498         case swift: return `Swift`;
499         case fortran: return `Fortran`;
500         case modelica: return `Modelica`;
501 
502         case math: return `mathematics`;
503         case physics: return `physics`;
504         case regularExpression: return `regular expression`;
505 
506         default:
507             import nxt.enum_ex : toStringFaster;
508             return lang.toStringFaster;
509         }
510     }
511 }
512 
513 Lang decodeLang(const scope const(char)[] lang) @safe pure nothrow @nogc
514 {
515     switch (lang)
516     {
517     case `is`:
518         return Lang.is_;
519     case `in`:
520         return Lang.in_;
521     default:
522         return typeof(return)(lang.toDefaulted!Lang(Lang.unknown));
523     }
524 }
525 
526 ///
527 @safe pure unittest
528 {
529     assert(`sv`.decodeLang == Lang.sv);
530 }
531 
532 Lang decodeLangDefaulted(scope const(char)[] lang,
533                          in Lang defaultLang) @safe pure nothrow @nogc
534 {
535     switch (lang)
536     {
537     case `is`:
538         return Lang.is_;
539     case `in`:
540         return Lang.in_;
541     default:
542         return typeof(return)(lang.toDefaulted!Lang(defaultLang));
543     }
544 }
545 
546 ///
547 @safe pure nothrow unittest
548 {
549     assert(`_`.decodeLangDefaulted(Lang.unknown) == Lang.unknown);
550     assert(`_`.decodeLangDefaulted(Lang.en) == Lang.en);
551     assert(`sv`.decodeLangDefaulted(Lang.unknown) == Lang.sv);
552     assert(`en`.decodeLangDefaulted(Lang.unknown) == Lang.en);
553 }
554 
555 ///
556 @safe pure nothrow /*TODO: @nogc*/ unittest
557 {
558     assert(Lang.unknown.toSpoken == `??`);
559     assert(Lang.c.toSpoken == `C`);
560     assert(Lang.cxx.toSpoken == `C++`);
561     assert(Lang.d.toSpoken == `D`);
562     assert(Lang.java.toSpoken == `Java`);
563 }
564 
565 string toHTML(in Lang lang) @safe pure nothrow /*TODO: @nogc*/
566 	=> lang.toSpoken;
567 
568 ///
569 string toMathML(in Lang lang) @safe pure nothrow /*TODO: @nogc*/
570 	=> lang.toHTML;
571 
572 /** Markup in Lang */
573 enum MarkupLang : ubyte
574 {
575     unknown,                    // Unknown: ?
576     HTML,
577     MathML
578 }
579 
580 /** Check if `lang` capitalize all its nouns include common nouns.
581  */
582 bool capitalizesCommonNoun(in Lang lang) @safe pure nothrow @nogc
583 	=> lang == Lang.de;
584 
585 ///
586 @safe pure nothrow @nogc unittest
587 {
588     assert(Lang.de.capitalizesCommonNoun);
589     assert(!Lang.en.capitalizesCommonNoun);
590 }