move i18n

i18n/i18n.ts

@@ -0,0 +1,179 @@
+/*
+ This file is part of TALER
+ (C) 2016 GNUnet e.V.
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
+ */
+
+"use strict";
+
+document.addEventListener(
+  "DOMContentLoaded",
+  function () {
+    document.body.lang = chrome.i18n.getUILanguage();
+  });
+
+declare var i18n: any;
+
+const JedModule = window["Jed"];
+var jed;
+var i18nDebug = false;
+
+
+class PluralNumber {
+  n: number;
+
+  constructor(n) {
+    this.n = n;
+  }
+
+  valueOf () {
+    return this.n;
+  }
+
+  toString () {
+    return this.n.toString();
+  }
+}
+
+
+/** Initialize Jed */
+function init () {
+  if ("object" === typeof jed) {
+    return;
+  }
+  if ("function" !== typeof JedModule) {
+    return;
+  }
+
+  if (!(i18n.lang in i18n.strings)) {
+    i18n.lang = "en-US";
+  }
+  jed = new JedModule(i18n.strings[i18n.lang]);
+
+  if (i18nDebug) {
+    let link = m("a[href=https://demo.taler.net]", i18n`free KUDOS`);
+    let i = 1, amount = 5, currency = "EUR", date = new Date(), text = "demo.taler.net";
+    console.log(i18n`DEBUG: Your balance on ${date} is ${amount} KUDO. Get more at ${text}`);
+    console.log(i18n.parts`DEBUG: Your balance on ${date} is ${amount} KUDO. Get more at ${link}`);
+    console.log(i18n.pluralize(i18n`DEBUG: Your balance is ${amount} KUDO.`,
+                               `DEBUG: Your balance is ${amount} KUDOs.`));
+    console.log(i18n.pluralize(i18n`DEBUG: #${i}: Your balance is ${i18n.number(amount)} KUDO.`,
+                               `DEBUG: #${i}: Your balance is ${i18n.number(amount)} KUDOs.`));
+  }
+}
+
+
+/** Convert template strings to a msgid */
+function toI18nString(strings) {
+  let str = "";
+  for (let i = 0; i < strings.length; i++) {
+    str += strings[i];
+    if (i < strings.length - 1) {
+      str += "%"+ (i+1) +"$s";
+    }
+  }
+  return str;
+}
+
+
+/** Use the first number in values to determine plural form */
+function getPluralValue (values) {
+  let n = null;
+  for (let i = 0; i < values.length; i++) {
+    if ("number" === typeof values[i] || values[i] instanceof PluralNumber) {
+      if (null === n || values[i] instanceof PluralNumber) {
+        n = values[i].valueOf();
+      }
+    }
+  }
+  return (null === n) ? 1 : n;
+}
+
+
+var i18n = <any>function i18n(strings, ...values) {
+  init();
+  if ("object" !== typeof jed) {
+    // Fallback implementation in case i18n lib is not there
+    return String.raw(strings, ...values);
+  }
+
+  let str = toI18nString (strings);
+  let n = getPluralValue (values);
+  let tr = jed.translate(str).ifPlural(n, str).fetch(...values);
+  if (i18nDebug) {
+    console.log('i18n:', 'n: ', n, 'strings:', strings, 'values:', values);
+    console.log('i18n:', 'str:', str);
+    console.log('i18n:', 'tr:', tr);
+  }
+  return tr;
+};
+
+i18n.lang = chrome.i18n.getUILanguage();
+i18n.strings = {};
+
+
+/**
+ * Interpolate i18nized values with arbitrary objects.
+ * @return Array of strings/objects.
+ */
+i18n.parts = function(strings, ...values) {
+  init();
+  if ("object" !== typeof jed) {
+    // Fallback implementation in case i18n lib is not there
+    let parts = [];
+
+    for (let i = 0; i < strings.length; i++) {
+      parts.push(strings[i]);
+      if (i < values.length) {
+        parts.push(values[i]);
+      }
+    }
+    return parts;
+  }
+
+  let str = toI18nString (strings);
+  let n = getPluralValue (values);
+  let tr = jed.ngettext(str, str, n).split(/%(\d+)\$s/);
+  let parts = [];
+  for (let i = 0; i < tr.length; i++) {
+    if (0 == i % 2) {
+      parts.push(tr[i]);
+    } else {
+      parts.push(values[parseInt(tr[i]) - 1]);
+    }
+  }
+
+  if (i18nDebug) {
+    console.log('i18n.parts:', 'n: ', n, 'strings:', strings, 'values:', values);
+    console.log('i18n.parts:', 'str:', str);
+    console.log('i18n.parts:', 'parts:', parts);
+  }
+  return parts;
+};
+
+
+/**
+ * Pluralize based on first numeric parameter in the template.
+ * @todo The plural argument is used for extraction by pogen.js
+ */
+i18n.pluralize = function (singular, plural) {
+  return singular;
+};
+
+
+/**
+ * Return a number that is used to determine the plural form for a template.
+ */
+i18n.number = function (n : number) {
+  return new PluralNumber (n);
+}