Add "localizePrice" helper

Author: bookernath

helpers/lib/icu-detect.js

@@ -0,0 +1,15 @@
+'use strict';
+
+const hasFullICU = (() => {
+    try {
+        const january = new Date(9e8);
+        const spanish = new Intl.DateTimeFormat('es', { month: 'long' });
+        return spanish.format(january) === 'enero';
+    } catch (err) {
+        return false;
+    }
+})();
+
+module.exports = {
+    hasFullICU
+};

helpers/localizePrice.js

@@ -0,0 +1,46 @@
+'use strict';
+const utils = require('handlebars-utils');
+// Detect ICU support
+const { hasFullICU } = require('./lib/icu-detect.js');
+
+const factory = () => {
+    return function(price, locale) {
+        if (!utils.isObject(price) || !utils.isString(price.currency)
+            || isNaN(price.value) || !utils.isString(price.formatted)) {
+            // Return empty string if this does not appear to be a price object
+            return ''
+        }
+
+        if (!utils.isString(locale) || locale.length < 2) {
+            // Valid browser language strings are at least two characters
+            // https://www.metamodpro.com/browser-language-codes
+            // If provided locale is less than two characters (or not a string),
+            // return the normal formatted price
+            return price.formatted;
+        }
+
+        // If the if full ICU is not installed, fall back to normal price
+        if (!hasFullICU){
+            return price.formatted;
+        }
+
+        // Try to format the price to the provided locale,
+        // but if anything goes wrong,
+        // just return the usual price
+        // Could happen if the full ICU is not installed,
+        // or if an invalid locale is provided.
+        try {
+            return new Intl.NumberFormat(
+                locale, { style: 'currency', currency: price.currency}
+            ).format(price.value);
+        }
+        catch (err){
+            return price.formatted;
+        }
+    };
+};
+
+module.exports = [{
+    name: 'localizePrice',
+    factory: factory,
+}];

package.json

@@ -7,7 +7,7 @@
   "license": "BSD-4-Clause",
   "scripts": {
     "linter": "eslint .",
-    "test": "npm run linter && lab -v -t 98 --ignore WebAssembly,_time,format,SharedArrayBuffer,Atomics,BigUint64Array,BigInt64Array,BigInt,URL,URLSearchParams,TextEncoder,TextDecoder,queueMicrotask spec",
+    "test": "cross-env NODE_ICU_DATA=node_modules/full-icu npm run linter && lab -v -t 98 --ignore WebAssembly,_time,format,SharedArrayBuffer,Atomics,BigUint64Array,BigInt64Array,BigInt,URL,URLSearchParams,TextEncoder,TextDecoder,queueMicrotask spec",
     "coverage": "lab -c -r console -o stdout -r html -o coverage.html spec"
   },
   "repository": {
@@ -34,7 +34,9 @@
   },
   "devDependencies": {
     "code": "~4.0.0",
+    "cross-env": "^7.0.2",
     "eslint": "~4.10.0",
+    "full-icu": "^1.3.1",
     "lab": "~13.0.4",
     "sinon": "~7.5.0"
   },

spec/helpers.js

@@ -41,6 +41,7 @@ describe('helper registration', () => {
             'lang',
             'langJson',
             'limit',
+            'localizePrice',
             'money',
             'nl2br',
             'or',

spec/helpers/localizePrice.js

@@ -0,0 +1,40 @@
+require('full-icu');
+
+const Lab = require('lab'),
+      lab = exports.lab = Lab.script(),
+      describe = lab.experiment,
+      it = lab.it,
+      specHelpers = require('../spec-helpers'),
+      testRunner = specHelpers.testRunner
+
+describe('localizePrice helper', function() {
+    const context = {
+        "price": {
+            "tax_label": "GST",
+            "without_tax": {
+                "currency": "USD",
+                "formatted": "$123,456.78",
+                "value": 123456.78
+            }
+        }
+    };
+
+    const runTestCases = testRunner({context});
+
+    it('should return return correct prices across a number of locales', function(done) {
+        runTestCases([
+            {
+                input: '{{localizePrice price.without_tax "en-US"}}',
+                output: '$123,456.78',
+            },
+            {
+                input: '{{localizePrice price.without_tax "ja-JP"}}',
+                output: '$123,456.78',
+            },
+            {
+                input: '{{localizePrice price.without_tax "de"}}',
+                output: '123.456,78 $',
+            },
+        ], done);
+    });
+});