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diff --git a/app/javascript/locales/locale-data/README.md b/app/javascript/locales/locale-data/README.md new file mode 100644 index 000000000..83368fae7 --- /dev/null +++ b/app/javascript/locales/locale-data/README.md @@ -0,0 +1,221 @@ +# Custom Locale Data + +This folder is used to store custom locale data. These custom locale data are +not yet provided by [Unicode Common Locale Data Repository](http://cldr.unicode.org/development/new-cldr-developers) +and hence not provided in [react-intl/locale-data/*](https://github.com/yahoo/react-intl). + +The locale data should support [Locale Data APIs](https://github.com/yahoo/react-intl/wiki/API#locale-data-apis) +of the react-intl library. + +It is recommended to start your custom locale data from this sample English +locale data ([*](#plural-rules)): + +```javascript +/*eslint eqeqeq: "off"*/ +/*eslint no-nested-ternary: "off"*/ + +export default [ + { + locale: "en", + pluralRuleFunction: function(e, a) { + var n = String(e).split("."), + l = !n[1], + o = Number(n[0]) == e, + t = o && n[0].slice(-1), + r = o && n[0].slice(-2); + return a ? 1 == t && 11 != r ? "one" : 2 == t && 12 != r ? "two" : 3 == t && 13 != r ? "few" : "other" : 1 == e && l ? "one" : "other" + }, + fields: { + year: { + displayName: "year", + relative: { + 0: "this year", + 1: "next year", + "-1": "last year" + }, + relativeTime: { + future: { + one: "in {0} year", + other: "in {0} years" + }, + past: { + one: "{0} year ago", + other: "{0} years ago" + } + } + }, + month: { + displayName: "month", + relative: { + 0: "this month", + 1: "next month", + "-1": "last month" + }, + relativeTime: { + future: { + one: "in {0} month", + other: "in {0} months" + }, + past: { + one: "{0} month ago", + other: "{0} months ago" + } + } + }, + day: { + displayName: "day", + relative: { + 0: "today", + 1: "tomorrow", + "-1": "yesterday" + }, + relativeTime: { + future: { + one: "in {0} day", + other: "in {0} days" + }, + past: { + one: "{0} day ago", + other: "{0} days ago" + } + } + }, + hour: { + displayName: "hour", + relativeTime: { + future: { + one: "in {0} hour", + other: "in {0} hours" + }, + past: { + one: "{0} hour ago", + other: "{0} hours ago" + } + } + }, + minute: { + displayName: "minute", + relativeTime: { + future: { + one: "in {0} minute", + other: "in {0} minutes" + }, + past: { + one: "{0} minute ago", + other: "{0} minutes ago" + } + } + }, + second: { + displayName: "second", + relative: { + 0: "now" + }, + relativeTime: { + future: { + one: "in {0} second", + other: "in {0} seconds" + }, + past: { + one: "{0} second ago", + other: "{0} seconds ago" + } + } + } + } + } +] + +``` + +## Notes + +### Plural Rules + +The function `pluralRuleFunction()` should return the key to proper string of +a plural form(s). The purpose of the function is to provide key of translate +strings of correct plural form according. The different forms are described in +[CLDR's Plural Rules][cldr-plural-rules], + +[cldr-plural-rules]: http://cldr.unicode.org/index/cldr-spec/plural-rules + +#### Quick Overview on CLDR Rules + +Let's take English as an example. + +When you describe a number, you can be either describe it as: +* Cardinals: 1st, 2nd, 3rd ... 11th, 12th ... 21st, 22nd, 23nd .... +* Ordinals: 1, 2, 3 ... + +In any of these cases, the nouns will reflect the number with singular or plural +form. For example: +* in 0 days +* in 1 day +* in 2 days + +The `pluralRuleFunction` receives 2 parameters: +* `e`: a string representation of the number. Such as, "`1`", "`2`", "`2.1`". +* `a`: `true` if this is "cardinal" type of description. `false` for ordinal and other case. + +#### How you should write `pluralRuleFunction` + +The first rule to write pluralRuleFunction is never translate the output string +into your language. [Plural Rules][cldr-plural-rules] specified you should use +these as the return values: + + * "`zero`" + * "`one`" (singular) + * "`two`" (dual) + * "`few`" (paucal) + * "`many`" (also used for fractions if they have a separate class) + * "`other`" (required—general plural form—also used if the language only has a single form) + +Again, we'll use English as the example here. + +Let's read the `return` statement in the pluralRuleFunction above: +```javascript + return a ? 1 == t && 11 != r ? "one" : 2 == t && 12 != r ? "two" : 3 == t && 13 != r ? "few" : "other" : 1 == e && l ? "one" : "other" +``` + +This nested ternary is hard to read. It basically means: +```javascript +// e: the number variable to examine +// a: "true" if cardinals +// l: "true" if the variable e has nothin after decimal mark (e.g. "1.0" would be false) +// o: "true" if the variable e is an integer +// t: the "ones" of the number. e.g. "3" for number "9123" +// r: the "ones" and "tens" of the number. e.g. "23" for number "9123" +if (a == true) { + if (t == 1 && r != 11) { + return "one"; // i.e. 1st, 21st, 101st, 121st ... + } else if (t == 2 && r != 12) { + return "two"; // i.e. 2nd, 22nd, 102nd, 122nd ... + } else if (t == 3 && r != 13) { + return "few"; // i.e. 3rd, 23rd, 103rd, 123rd ... + } else { + return "other"; // i.e. 4th, 11th, 12th, 24th ... + } +} else { + if (e == 1 && l) { + return "one"; // i.e. 1 day + } else { + return "other"; // i.e. 0 days, 2 days, 3 days + } +} +``` + +If your language, like French, do not have complicated cardinal rules, you may +use the French's version of it: +```javascript +function (e, a) { + return a ? 1 == e ? "one" : "other" : e >= 0 && e < 2 ? "one" : "other"; +} +``` + +If your language, like Chinese, do not have any pluralization rule at all you +may use the Chinese's version of it: +```javascript +function (e, a) { + return "other"; +} +``` |