forked from mirrors/gecko-dev
203 lines
6.9 KiB
JavaScript
203 lines
6.9 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* The code below is mostly is a slight modification of intl/locale/PluralForm.jsm that
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* removes dependencies on chrome privileged APIs. To make maintenance easier, this file
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* is kept as close as possible to the original in terms of implementation.
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* The modified methods here are
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* - makeGetter (remove code adding the caller name to the log)
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* - get ruleNum() (rely on LocalizationHelper instead of String.services)
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* - log() (rely on console.log)
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*
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* Disable eslint warnings to preserve original code style.
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*/
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/* eslint-disable */
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/**
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* This module provides the PluralForm object which contains a method to figure
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* out which plural form of a word to use for a given number based on the
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* current localization. There is also a makeGetter method that creates a get
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* function for the desired plural rule. This is useful for extensions that
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* specify their own plural rule instead of relying on the browser default.
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* (I.e., the extension hasn't been localized to the browser's locale.)
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*
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* See: http://developer.mozilla.org/en/docs/Localization_and_Plurals
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*
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* List of methods:
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*
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* string pluralForm
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* get(int aNum, string aWords)
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*
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* int numForms
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* numForms()
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*
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* [string pluralForm get(int aNum, string aWords), int numForms numForms()]
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* makeGetter(int aRuleNum)
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* Note: Basically, makeGetter returns 2 functions that do "get" and "numForm"
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*/
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const { LocalizationHelper } = require("devtools/shared/l10n");
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const L10N = new LocalizationHelper("toolkit/locales/intl.properties");
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// These are the available plural functions that give the appropriate index
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// based on the plural rule number specified. The first element is the number
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// of plural forms and the second is the function to figure out the index.
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const gFunctions = [
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// 0: Chinese
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[1, (n) => 0],
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// 1: English
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[2, (n) => n!=1?1:0],
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// 2: French
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[2, (n) => n>1?1:0],
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// 3: Latvian
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[3, (n) => n%10==1&&n%100!=11?1:n%10==0?0:2],
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// 4: Scottish Gaelic
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[4, (n) => n==1||n==11?0:n==2||n==12?1:n>0&&n<20?2:3],
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// 5: Romanian
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[3, (n) => n==1?0:n==0||n%100>0&&n%100<20?1:2],
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// 6: Lithuanian
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[3, (n) => n%10==1&&n%100!=11?0:n%10>=2&&(n%100<10||n%100>=20)?2:1],
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// 7: Russian
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[3, (n) => n%10==1&&n%100!=11?0:n%10>=2&&n%10<=4&&(n%100<10||n%100>=20)?1:2],
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// 8: Slovak
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[3, (n) => n==1?0:n>=2&&n<=4?1:2],
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// 9: Polish
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[3, (n) => n==1?0:n%10>=2&&n%10<=4&&(n%100<10||n%100>=20)?1:2],
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// 10: Slovenian
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[4, (n) => n%100==1?0:n%100==2?1:n%100==3||n%100==4?2:3],
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// 11: Irish Gaeilge
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[5, (n) => n==1?0:n==2?1:n>=3&&n<=6?2:n>=7&&n<=10?3:4],
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// 12: Arabic
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[6, (n) => n==0?5:n==1?0:n==2?1:n%100>=3&&n%100<=10?2:n%100>=11&&n%100<=99?3:4],
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// 13: Maltese
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[4, (n) => n==1?0:n==0||n%100>0&&n%100<=10?1:n%100>10&&n%100<20?2:3],
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// 14: Unused
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[3, (n) => n%10==1?0:n%10==2?1:2],
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// 15: Icelandic, Macedonian
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[2, (n) => n%10==1&&n%100!=11?0:1],
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// 16: Breton
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[5, (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!=14&&n%100!=19&&n%100!=73&&n%100!=74&&n%100!=79&&n%100!=93&&n%100!=94&&n%100!=99?2:n%1000000==0&&n!=0?3:4],
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// 17: Shuar
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[2, (n) => n!=0?1:0],
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// 18: Welsh
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[6, (n) => n==0?0:n==1?1:n==2?2:n==3?3:n==6?4:5],
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// 19: Bosnian, Croatian, Serbian
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[3, (n) => n % 10 == 1 && n % 100 != 11 ? 0 : n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2],
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];
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const PluralForm = {
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/**
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* Get the correct plural form of a word based on the number
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*
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* @param aNum
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* The number to decide which plural form to use
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* @param aWords
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* A semi-colon (;) separated string of words to pick the plural form
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* @return The appropriate plural form of the word
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*/
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get get()
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{
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// This method will lazily load to avoid perf when it is first needed and
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// creates getPluralForm function. The function it creates is based on the
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// value of pluralRule specified in the intl stringbundle.
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// See: http://developer.mozilla.org/en/docs/Localization_and_Plurals
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// Delete the getters to be overwritten
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delete this.numForms;
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delete this.get;
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// Make the plural form get function and set it as the default get
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[this.get, this.numForms] = this.makeGetter(this.ruleNum);
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return this.get;
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},
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/**
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* Create a pair of plural form functions for the given plural rule number.
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*
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* @param aRuleNum
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* The plural rule number to create functions
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* @return A pair: [function that gets the right plural form,
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* function that returns the number of plural forms]
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*/
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makeGetter: function(aRuleNum)
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{
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// Default to "all plural" if the value is out of bounds or invalid
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if (aRuleNum < 0 || aRuleNum >= gFunctions.length || isNaN(aRuleNum)) {
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log(["Invalid rule number: ", aRuleNum, " -- defaulting to 0"]);
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aRuleNum = 0;
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}
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// Get the desired pluralRule function
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let [numForms, pluralFunc] = gFunctions[aRuleNum];
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// Return functions that give 1) the number of forms and 2) gets the right
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// plural form
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return [function(aNum, aWords) {
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// Figure out which index to use for the semi-colon separated words
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let index = pluralFunc(aNum ? Number(aNum) : 0);
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let words = aWords ? aWords.split(/;/) : [""];
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// Explicitly check bounds to avoid strict warnings
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let ret = index < words.length ? words[index] : undefined;
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// Check for array out of bounds or empty strings
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if ((ret == undefined) || (ret == "")) {
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// Display a message in the error console
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log(["Index #", index, " of '", aWords, "' for value ", aNum,
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" is invalid -- plural rule #", aRuleNum, ";"]);
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// Default to the first entry (which might be empty, but not undefined)
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ret = words[0];
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}
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return ret;
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}, () => numForms];
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},
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/**
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* Get the number of forms for the current plural rule
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*
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* @return The number of forms
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*/
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get numForms()
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{
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// We lazily load numForms, so trigger the init logic with get()
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this.get();
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return this.numForms;
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},
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/**
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* Get the plural rule number from the intl stringbundle
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*
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* @return The plural rule number
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*/
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get ruleNum()
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{
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try {
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return parseInt(L10N.getStr("pluralRule"), 10);
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} catch (e) {
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// Fallback to English if the pluralRule property is not available.
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return 1;
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}
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}
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};
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/**
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* Private helper function to log errors to the error console and command line
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*
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* @param aMsg
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* Error message to log or an array of strings to concat
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*/
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function log(aMsg)
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{
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let msg = "plural-form.js: " + (aMsg.join ? aMsg.join("") : aMsg);
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console.log(msg + "\n");
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}
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exports.PluralForm = PluralForm;
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exports.get = PluralForm.get;
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/* eslint-enable */
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