From c89f2084157ad009dd192c9b6da313a0ac9c1fd7 Mon Sep 17 00:00:00 2001
From: Zibi Braniecki <zbraniecki@mozilla.com>
Date: Sat, 9 Sep 2017 19:23:03 -0700
Subject: [PATCH] Bug 1347798 - Create a small per-document bindings for
 DOMLocalization. r=mossop

MozReview-Commit-ID: DfxIYVxyt9C

--HG--
extra : rebase_source : 946084f272be3aee55c6690200a51bf78a141fa8
---
 browser/components/nsBrowserGlue.js | 10 ++++++
 intl/l10n/Localization.jsm          | 11 +++++++
 intl/l10n/jar.mn                    |  2 ++
 intl/l10n/l10n.js                   | 51 +++++++++++++++++++++++++++++
 intl/l10n/moz.build                 |  2 ++
 5 files changed, 76 insertions(+)
 create mode 100644 intl/l10n/jar.mn
 create mode 100644 intl/l10n/l10n.js

diff --git a/browser/components/nsBrowserGlue.js b/browser/components/nsBrowserGlue.js
index e865481cbbc3..2287244d653f 100644
--- a/browser/components/nsBrowserGlue.js
+++ b/browser/components/nsBrowserGlue.js
@@ -37,8 +37,10 @@ XPCOMUtils.defineLazyModuleGetters(this, {
   ExtensionsUI: "resource:///modules/ExtensionsUI.jsm",
   Feeds: "resource:///modules/Feeds.jsm",
   FileUtils: "resource://gre/modules/FileUtils.jsm",
+  FileSource: "resource://gre/modules/L10nRegistry.jsm",
   FormValidationHandler: "resource:///modules/FormValidationHandler.jsm",
   Integration: "resource://gre/modules/Integration.jsm",
+  L10nRegistry: "resource://gre/modules/L10nRegistry.jsm",
   LightweightThemeManager: "resource://gre/modules/LightweightThemeManager.jsm",
   LoginHelper: "resource://gre/modules/LoginHelper.jsm",
   LoginManagerParent: "resource://gre/modules/LoginManagerParent.jsm",
@@ -630,6 +632,14 @@ BrowserGlue.prototype = {
       });
     }
 
+
+    // Initialize the default l10n resource sources for L10nRegistry.
+    const locales = [AppConstants.INSTALL_LOCALE];
+    const toolkitSource = new FileSource('toolkit', locales, 'resource://gre/localization/{locale}/');
+    L10nRegistry.registerSource(toolkitSource);
+    const appSource = new FileSource('app', locales, 'resource://app/localization/{locale}/');
+    L10nRegistry.registerSource(appSource);
+
     Services.obs.notifyObservers(null, "browser-ui-startup-complete");
   },
 
diff --git a/intl/l10n/Localization.jsm b/intl/l10n/Localization.jsm
index 0b02e8172904..f12af89d601f 100644
--- a/intl/l10n/Localization.jsm
+++ b/intl/l10n/Localization.jsm
@@ -57,6 +57,17 @@ class CachedIterable {
       }
     };
   }
+
+  /**
+   * This method allows user to consume the next element from the iterator
+   * into the cache.
+   */
+  touchNext() {
+    const { seen, iterator } = this;
+    if (seen.length === 0 || seen[seen.length - 1].done === false) {
+      seen.push(iterator.next());
+    }
+  }
 }
 
 /**
diff --git a/intl/l10n/jar.mn b/intl/l10n/jar.mn
new file mode 100644
index 000000000000..2bd7ce1df14a
--- /dev/null
+++ b/intl/l10n/jar.mn
@@ -0,0 +1,2 @@
+toolkit.jar:
+  content/global/l10n.js
diff --git a/intl/l10n/l10n.js b/intl/l10n/l10n.js
new file mode 100644
index 000000000000..a4e2f0a608b8
--- /dev/null
+++ b/intl/l10n/l10n.js
@@ -0,0 +1,51 @@
+{
+  const { DOMLocalization } =
+    Components.utils.import("resource://gre/modules/DOMLocalization.jsm");
+
+  /**
+   * Polyfill for document.ready polyfill.
+   * See: https://github.com/whatwg/html/issues/127 for details.
+   *
+   * @returns {Promise}
+   */
+  function documentReady() {
+    const rs = document.readyState;
+    if (rs === 'interactive' || rs === 'completed') {
+      return Promise.resolve();
+    }
+
+    return new Promise(
+      resolve => document.addEventListener(
+        'readystatechange', resolve, { once: true }
+      )
+    );
+  }
+
+  /**
+   * Scans the `elem` for links with localization resources.
+   *
+   * @param {Element} elem
+   * @returns {Array<string>}
+   */
+  function getResourceLinks(elem) {
+    return Array.from(elem.querySelectorAll('link[rel="localization"]')).map(
+      el => el.getAttribute('href')
+    );
+  }
+
+  const resourceIds = getResourceLinks(document.head || document);
+
+  document.l10n = new DOMLocalization(window, resourceIds);
+
+  // trigger first context to be fetched eagerly
+  document.l10n.ctxs.touchNext();
+
+  document.l10n.ready = documentReady().then(() => {
+    document.l10n.registerObservers();
+    window.addEventListener('unload', () => {
+      document.l10n.unregisterObservers();
+    });
+    document.l10n.connectRoot(document.documentElement);
+    return document.l10n.translateRoots();
+  });
+}
diff --git a/intl/l10n/moz.build b/intl/l10n/moz.build
index ee1a8279c8c6..344ceb46a30b 100644
--- a/intl/l10n/moz.build
+++ b/intl/l10n/moz.build
@@ -15,4 +15,6 @@ XPCSHELL_TESTS_MANIFESTS += ['test/xpcshell.ini']
 
 MOCHITEST_CHROME_MANIFESTS += ['test/chrome.ini']
 
+JAR_MANIFESTS += ['jar.mn']
+
 FINAL_LIBRARY = 'xul'