Use dependency injection instead of Intl

Author: adamhooper

README.md

@@ -243,24 +243,25 @@ polyglot.t("car", 2);
 => "2 cars"
 ```
 
-Interpolated `Number`s will be number-formatted according to the `locale`:
+If you pass a `numberFormat` to the constructor, interpolated `Number`s will
+be formatted by its `format()` method. That's useful because different locales
+have different rules for formatting numbers: `2,000.56` in English versus
+`1 234,56` in French, for instance.
 
 ```js
-polyglot.t("num_cars", 2000);
+polyglot = new Polyglot({
+  phrases: { num_cars: '%{smart_count} car |||| %{smart_count} cars' },
+  numberFormat: new Intl.NumberFormat('en') // Chrome, Firefox, IE11+, Node 0.12+ with ICU
+})
+polyglot.t("num_cars", 2000); // internally, calls options.numberFormat.format(2000)
 => "2,000 cars"
 ```
 
-On a default Node install, this may only work in English. To format in
-non-English locales (e.g., to output "2.000" in France or use other numerals),
-compile Node with "full" ICU data or include the `full-icu` package in your
-project:
-
-1. `npm install --save full-icu`
-2. Run `node --full-data-dir=node_modules/full-icu` instead of just `node`, or
-   set the `NODE_ICU_DATA=node_modules/full-icu` environment variable.
-
-If you're running Polyglot within a browser, it can number-format in any
-locale the web browser supports.
+(A primer on [Intl.NumberFormat](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NumberFormat)
+in Node: Node 0.12+ comes with Intl as long as it's compiled with ICU (which is
+the default). By default, the only locale Node supports is en-US. You can add
+[full-icu](https://www.npmjs.com/package/full-icu) to your project to support
+other locales.
 
 If you like, you can provide a default value in case the phrase is missing.
 Use the special option key "_" to specify a default.

index.js

@@ -163,12 +163,7 @@ function Polyglot(options) {
   this.phrases = {};
   this.extend(opts.phrases || {});
   this.currentLocale = opts.locale || 'en';
-  if (typeof Intl === 'object') {
-    this.numberFormat = new Intl.NumberFormat(this.currentLocale);
-  } else {
-    // Fallback for IE<11
-    this.numberFormat = { format: function (n) { return String(n); } };
-  }
+  this.numberFormat = opts.numberFormat || { format: String };
   this.allowMissing = !!opts.allowMissing;
   this.warn = opts.warn || warn;
 }
@@ -179,12 +174,6 @@ function Polyglot(options) {
 Polyglot.prototype.locale = function (newLocale) {
   if (newLocale) {
     this.currentLocale = newLocale;
-    if (typeof Intl === 'object') {
-      this.numberFormat = new Intl.NumberFormat(this.currentLocale);
-    } else {
-      // Fallback for IE<11
-      this.numberFormat = { format: function (n) { return String(n); } };
-    }
   }
   return this.currentLocale;
 };

package.json

@@ -36,7 +36,6 @@
     "eslint": "^3.9.1",
     "eslint-config-airbnb-base": "^10.0.1",
     "eslint-plugin-import": "^2.2.0",
-    "full-icu": "^1.0.3",
     "mocha": "^3.1.2",
     "should": "^11.1.1",
     "uglify-js": "2.7.3"

test/index.js

@@ -92,11 +92,13 @@ describe('t', function () {
   });
 
   it('uses an Intl.NumberFormat', function () {
-    var en = new Polyglot({ phrases: phrases, locale: 'en' });
-    var fr = new Polyglot({ phrases: phrases, locale: 'fr' });
+    var instance = new Polyglot({
+      phrases: phrases,
+      // prove we're passed a Number by doing math on it and formatting it
+      numberFormat: { format: function (n) { return 'x' + (n + 2); } }
+    });
 
-    expect(en.t('number', { number: 1234.56 })).to.equal('1,234.56');
-    expect(fr.t('number', { number: 1234.56 })).to.equal('1 234,56');
+    expect(instance.t('number', { number: 1234.56 })).to.equal('x1236.56');
   });
 });
 
@@ -174,12 +176,6 @@ describe('locale', function () {
     polyglot.locale('fr');
     expect(polyglot.locale()).to.equal('fr');
   });
-
-  it('updates number format when setting locale', function () {
-    polyglot.locale('fr');
-    polyglot.extend({ x: '%{n}' });
-    expect(polyglot.t('x', { n: 1234.56 })).to.equal('1 234,56');
-  });
 });
 
 describe('extend', function () {