The Tor Browser: intl/locale/src/PluralForm.jsm@6474c204b198 (annotated)

intl/locale/src/PluralForm.jsm@6474c204b198 (annotated)

intl/locale/src/PluralForm.jsm

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 this.EXPORTED_SYMBOLS = [ "PluralForm" ];
 /**
  * This module provides the PluralForm object which contains a method to figure
  * out which plural form of a word to use for a given number based on the
  * current localization. There is also a makeGetter method that creates a get
  * function for the desired plural rule. This is useful for extensions that
  * specify their own plural rule instead of relying on the browser default.
  * (I.e., the extension hasn't been localized to the browser's locale.)
  *
  * See: http://developer.mozilla.org/en/docs/Localization_and_Plurals
  *
  * List of methods:
  *
  * string pluralForm
  * get(int aNum, string aWords)
  *
  * int numForms
  * numForms()
  *
  * [string pluralForm get(int aNum, string aWords), int numForms numForms()]
  * makeGetter(int aRuleNum)
  * Note: Basically, makeGetter returns 2 functions that do "get" and "numForm"
  */
 const Cc = Components.classes;
 const Ci = Components.interfaces;
 const kIntlProperties = "chrome://global/locale/intl.properties";
 // These are the available plural functions that give the appropriate index
 // based on the plural rule number specified. The first element is the number
 // of plural forms and the second is the function to figure out the index.
 let gFunctions = [
   // 0: Chinese
   [1, function(n) 0],
   // 1: English
   [2, function(n) n!=1?1:0],
   // 2: French
   [2, function(n) n>1?1:0],
   // 3: Latvian
   [3, function(n) n%10==1&&n%100!=11?1:n!=0?2:0],
   // 4: Scottish Gaelic
   [4, function(n) n==1||n==11?0:n==2||n==12?1:n>0&&n<20?2:3],
   // 5: Romanian
   [3, function(n) n==1?0:n==0||n%100>0&&n%100<20?1:2],
   // 6: Lithuanian
   [3, function(n) n%10==1&&n%100!=11?0:n%10>=2&&(n%100<10||n%100>=20)?2:1],
   // 7: Russian
   [3, function(n) n%10==1&&n%100!=11?0:n%10>=2&&n%10<=4&&(n%100<10||n%100>=20)?1:2],
   // 8: Slovak
   [3, function(n) n==1?0:n>=2&&n<=4?1:2],
   // 9: Polish
   [3, function(n) n==1?0:n%10>=2&&n%10<=4&&(n%100<10||n%100>=20)?1:2],
   // 10: Slovenian
   [4, function(n) n%100==1?0:n%100==2?1:n%100==3||n%100==4?2:3],
   // 11: Irish Gaeilge
   [5, function(n) n==1?0:n==2?1:n>=3&&n<=6?2:n>=7&&n<=10?3:4],
   // 12: Arabic
   [6, function(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],
   // 13: Maltese
   [4, function(n) n==1?0:n==0||n%100>0&&n%100<=10?1:n%100>10&&n%100<20?2:3],
   // 14: Macedonian
   [3, function(n) n%10==1?0:n%10==2?1:2],
   // 15: Icelandic
   [2, function(n) n%10==1&&n%100!=11?0:1],
   // 16: Breton
   [5, function(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],
 ];
 this.PluralForm = {
   /**
    * Get the correct plural form of a word based on the number
    *
    * @param aNum
    *        The number to decide which plural form to use
    * @param aWords
    *        A semi-colon (;) separated string of words to pick the plural form
    * @return The appropriate plural form of the word
    */
   get get()
   {
     // This method will lazily load to avoid perf when it is first needed and
     // creates getPluralForm function. The function it creates is based on the
     // value of pluralRule specified in the intl stringbundle.
     // See: http://developer.mozilla.org/en/docs/Localization_and_Plurals
     // Delete the getters to be overwritten
     delete PluralForm.numForms;
     delete PluralForm.get;
     // Get the plural rule number from the intl stringbundle
     let ruleNum = Number(Cc["@mozilla.org/intl/stringbundle;1"].
       getService(Ci.nsIStringBundleService).createBundle(kIntlProperties).
       GetStringFromName("pluralRule"));
     // Make the plural form get function and set it as the default get
     [PluralForm.get, PluralForm.numForms] = PluralForm.makeGetter(ruleNum);
     return PluralForm.get;
   },
   /**
    * Create a pair of plural form functions for the given plural rule number.
    *
    * @param aRuleNum
    *        The plural rule number to create functions
    * @return A pair: [function that gets the right plural form,
    *                  function that returns the number of plural forms]
    */
   makeGetter: function(aRuleNum)
   {
     // Default to "all plural" if the value is out of bounds or invalid
     if (aRuleNum < 0 || aRuleNum >= gFunctions.length || isNaN(aRuleNum)) {
       log(["Invalid rule number: ", aRuleNum, " -- defaulting to 0"]);
       aRuleNum = 0;
     }
     // Get the desired pluralRule function
     let [numForms, pluralFunc] = gFunctions[aRuleNum];
     // Return functions that give 1) the number of forms and 2) gets the right
     // plural form
     return [function(aNum, aWords) {
       // Figure out which index to use for the semi-colon separated words
       let index = pluralFunc(aNum ? Number(aNum) : 0);
       let words = aWords ? aWords.split(/;/) : [""];
       // Explicitly check bounds to avoid strict warnings
       let ret = index < words.length ? words[index] : undefined;
       // Check for array out of bounds or empty strings
       if ((ret == undefined) || (ret == "")) {
         // Report the caller to help figure out who is causing badness
         let caller = PluralForm.get.caller ? PluralForm.get.caller.name : "top";
         // Display a message in the error console
         log(["Index #", index, " of '", aWords, "' for value ", aNum,
             " is invalid -- plural rule #", aRuleNum, "; called by ", caller]);
         // Default to the first entry (which might be empty, but not undefined)
         ret = words[0];
       }
       return ret;
     }, function() numForms];
   },
   /**
    * Get the number of forms for the current plural rule
    *
    * @return The number of forms
    */
   get numForms()
   {
     // We lazily load numForms, so trigger the init logic with get()
     PluralForm.get();
     return PluralForm.numForms;
   },
 };
 /**
  * Private helper function to log errors to the error console and command line
  *
  * @param aMsg
  *        Error message to log or an array of strings to concat
  */
 function log(aMsg)
 {
   let msg = "PluralForm.jsm: " + (aMsg.join ? aMsg.join("") : aMsg);
   Cc["@mozilla.org/consoleservice;1"].getService(Ci.nsIConsoleService).
     logStringMessage(msg);
   dump(msg + "\n");
 }

The Tor Browser / annotate

intl/locale/src/PluralForm.jsm@6474c204b198 (annotated)

intl/locale/src/PluralForm.jsm