fast-plural-rules
Version:
Evaluates locale-specific plural rules to identify the right plural form for a cardinal number, which represents an item count.
313 lines (310 loc) • 7.68 kB
JavaScript
const cardinals = {
rules: [
() => 0,
n => n === 1 ? 0 : 1,
n => n <= 1 ? 0 : 1,
n => n % 10 === 1 && n % 100 !== 11 ? 1 : n % 10 !== 0 ? 2 : 0,
n => n === 1 || n === 11 ? 0 : n === 2 || n === 12 ? 1 : n > 2 && n < 20 ? 2 : 3,
n => n === 1 ? 0 : n === 0 || (n % 100 > 0 && n % 100 < 20) ? 1 : 2,
n => n % 10 === 1 && n % 100 !== 11
? 0
: n % 10 >= 2 && (n % 100 < 10 || n % 100 >= 20) ? 2 : 1,
n => n % 10 === 1 && n % 100 !== 11
? 0
: n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2,
n => n === 1 ? 0 : n >= 2 && n <= 4 ? 1 : 2,
n => n === 1
? 0
: n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2,
n => n % 100 === 1 ? 0 : n % 100 === 2 ? 1 : n % 100 === 3 || n % 100 === 4 ? 2 : 3,
n => n === 1 ? 0 : n === 2 ? 1 : n > 2 && n < 7 ? 2 : n > 6 && n < 11 ? 3 : 4,
n => n === 1
? 0
: n === 2
? 1
: n % 100 >= 3 && n % 100 <= 10
? 2
: n % 100 >= 11 ? 3 : n !== 0 ? 4 : 5,
n => n === 1
? 0
: n === 0 || (n % 100 > 0 && n % 100 < 11)
? 1
: n % 100 > 10 && n % 100 < 20 ? 2 : 3,
n => n % 10 === 1 ? 0 : n % 10 === 2 ? 1 : 2,
n => n % 10 === 1 && n % 100 !== 11 ? 0 : 1,
n => n % 10 === 1 && n % 100 !== 11 && n % 100 !== 71 && n % 100 !== 91
? 0
: n % 10 === 2 && n % 100 !== 12 && n % 100 !== 72 && n % 100 !== 92
? 1
: (n % 10 === 3 || n % 10 === 4 || n % 10 === 9) &&
n % 100 !== 13 && n % 100 !== 73 && n % 100 !== 93 &&
n % 100 !== 14 && n % 100 !== 74 && n % 100 !== 94 &&
n % 100 !== 19 && n % 100 !== 79 && n % 100 !== 99
? 2
: n !== 0 && n % 1000000 === 0
? 3
: 4,
n => n !== 0 ? 1 : 0,
n => n === 1 ? 1 : n === 2 ? 2 : n === 3 ? 3 : n === 6 ? 4 : n !== 0 ? 5 : 0,
n => n === 1
? 0
: n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2,
n => n === 1 ? 0 : n === 2 ? 1 : n === 3 ? 2 : 3,
n => n % 10 === 1 && n % 100 !== 11
? 0
: n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2,
n => n === 0 ? 0 : n === 1 ? 1 : 2
],
rulesByLocale: {
ach: 2,
af: 1,
ak: 2,
am: 2,
an: 1,
anp: 1,
ar: 12,
arn: 2,
as: 1,
ast: 1,
ay: 0,
az: 1,
be: 7,
bg: 1,
bn: 1,
bo: 0,
br: 2,
brx: 1,
bs: 7,
ca: 1,
cgg: 0,
cs: 8,
csb: 19,
cy: 18,
da: 1,
de: 1,
doi: 1,
dz: 0,
el: 1,
en: 1,
eo: 1,
es: 1,
'es-ar': 1,
et: 1,
eu: 1,
fa: 2,
ff: 1,
fi: 1,
fil: 2,
fo: 1,
fr: 2,
fur: 1,
fy: 1,
ga: 11,
gd: 4,
gl: 1,
gu: 1,
gun: 2,
ha: 1,
he: 1,
hi: 1,
hne: 1,
hr: 7,
hu: 1,
hy: 1,
ia: 1,
id: 0,
is: 15,
it: 1,
ja: 0,
jbo: 0,
jv: 17,
ka: 0,
kk: 1,
kl: 1,
km: 0,
kn: 1,
ko: 0,
ku: 1,
kw: 20,
ky: 1,
lb: 1,
ln: 2,
lo: 0,
lt: 6,
lv: 3,
mai: 1,
me: 21,
mfe: 2,
mg: 2,
mi: 2,
mk: 15,
ml: 1,
mn: 1,
mni: 1,
mnk: 22,
mr: 1,
ms: 0,
mt: 13,
my: 0,
nah: 1,
nap: 1,
nb: 1,
ne: 1,
nl: 1,
nn: 1,
no: 1,
nso: 1,
oc: 2,
or: 1,
pa: 1,
pap: 1,
pl: 9,
pms: 1,
ps: 1,
pt: 1,
'pt-br': 2,
rm: 1,
ro: 5,
ru: 7,
rw: 1,
sah: 0,
sat: 1,
sco: 1,
sd: 1,
se: 1,
si: 1,
sk: 8,
sl: 10,
so: 1,
son: 1,
sq: 1,
sr: 7,
su: 0,
sv: 1,
sw: 1,
ta: 1,
te: 1,
tg: 2,
th: 0,
ti: 2,
tk: 1,
tr: 2,
tt: 0,
ug: 0,
uk: 7,
ur: 1,
uz: 2,
vi: 0,
wa: 2,
wo: 0,
yo: 1,
'zh-cn': 0,
'zh-tw': 2
},
formsByIndex: [
['other'],
['one', 'other'],
['one', 'other'],
['zero', 'one', 'other'],
['one', 'two', 'few', 'other'],
['one', 'few', 'other'],
['one', 'few', 'other'],
['one', 'few', 'other'],
['one', 'few', 'other'],
['one', 'few', 'other'],
['one', 'two', 'few', 'other'],
['one', 'two', 'few', 'many', 'other'],
['one', 'two', 'few', 'many', 'other', 'zero'],
['one', 'few', 'many', 'other'],
['one', 'few', 'other'],
['one', 'other'],
['one', 'two', 'few', 'many', 'other'],
['zero', 'other'],
['zero', 'one', 'two', 'few', 'many', 'other'],
['one', 'few', 'other'],
['one', 'two', 'few', 'other'],
['one', 'few', 'other'],
['zero', 'one', 'other']
]
};
const { rules, rulesByLocale, formsByIndex } = cardinals;
function normalizeLocale (locale) {
return locale.toLowerCase().replace('_', '-')
}
function getLanguage (locale) {
const separator = locale.indexOf('-');
return separator > 0 ? locale.substr(0, separator) : locale
}
function getPluralRuleIndexForCardinalsByLocale (locale) {
locale = normalizeLocale(locale);
let index = rulesByLocale[locale];
if (index === undefined) {
const language = getLanguage(locale);
index = rulesByLocale[language];
}
if (index === undefined) {
throw new Error(`Unrecognized locale: "${locale}".`)
}
return index
}
function adaptPluralRuleForFormName (rule, index) {
const forms = formsByIndex[index];
return function (count) {
return forms[rule(count)]
}
}
function getPluralRuleForCardinalsByLocale (locale) {
const index = getPluralRuleIndexForCardinalsByLocale(locale);
return rules[index]
}
function getPluralRuleForCardinalsByIndex (index) {
const rule = rules[index];
if (rule === undefined) {
throw new Error(`Invalid index: "${index}".`)
}
return rule
}
function getPluralRuleForNamedFormsForCardinalsByLocale (locale) {
const index = getPluralRuleIndexForCardinalsByLocale(locale);
return adaptPluralRuleForFormName(rules[index], index)
}
function getPluralRuleForNamedFormsForCardinalsByIndex (index) {
const rule = rules[index];
if (rule === undefined) {
throw new Error(`Invalid index: "${index}".`)
}
return adaptPluralRuleForFormName(rules[index], index)
}
function getPluralFormForCardinalByLocale (locale, count) {
const rule = getPluralRuleForCardinalsByLocale(locale);
return rule(count)
}
function getPluralFormForCardinalByIndex (index, count) {
const rule = getPluralRuleForCardinalsByIndex(index);
return rule(count)
}
function getPluralFormNameForCardinalByLocale (locale, count) {
const rule = getPluralRuleForNamedFormsForCardinalsByLocale(locale);
return rule(count)
}
function getPluralFormNameForCardinalByIndex (index, count) {
const rule = getPluralRuleForNamedFormsForCardinalsByIndex(index);
return rule(count)
}
let supportedLocales;
function getSupportedLocales() {
if (!supportedLocales) supportedLocales = Object.keys(rulesByLocale);
return supportedLocales
}
function getPluralFormCountForLocale(locale) {
const index = rulesByLocale[locale];
if (index === undefined) return
return formsByIndex[index].length
}
function getPluralFormNamesForLocale(locale) {
const index = rulesByLocale[locale];
if (index === undefined) return
return formsByIndex[index]
}
export { getPluralFormCountForLocale, getPluralFormForCardinalByIndex, getPluralFormForCardinalByLocale, getPluralFormNameForCardinalByIndex, getPluralFormNameForCardinalByLocale, getPluralFormNamesForLocale, getPluralRuleForCardinalsByIndex, getPluralRuleForCardinalsByLocale, getPluralRuleForNamedFormsForCardinalsByIndex, getPluralRuleForNamedFormsForCardinalsByLocale, getSupportedLocales };
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