Adds facilities for extracting Intl.message calls and generating code from translations

pkg/intl/test/message_extraction/make_hardcoded_translation.dart

Index: pkg/intl/test/message_extraction/make_hardcoded_translation.dart
diff --git a/pkg/intl/test/message_extraction/make_hardcoded_translation.dart b/pkg/intl/test/message_extraction/make_hardcoded_translation.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3f7977c24fdb2d668409c1dc4dcf360ed312a8d9
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+++ b/pkg/intl/test/message_extraction/make_hardcoded_translation.dart
@@ -0,0 +1,105 @@
+#!/usr/bin/env dart
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/**
+ * This simulates a translation process, reading the messages generated
+ * from extract_message.dart for the files sample_with_messages.dart and
+ * part_of_sample_with_messages.dart and writing out hard-coded translations for
+ * German and French locales.
+ */
+
+import 'dart:io';
+import 'dart:json' as json;
+import 'package:pathos/path.dart' as path;
+import 'find_output_directory.dart';
+
+/** A list of the French translations that we will produce. */
+var french = {
+  "types" : r"$a, $b, $c",
+  "multiLine" : "Cette message prend plusiers lignes.",
+  "message2" : r"Un autre message avec un seul paramètre $x",
+  "alwaysTranslated" : "Cette chaîne est toujours traduit",
+  "message1" : "Il s'agit d'un message",
+  "leadingQuotes" : "\"Soi-disant\"",
+  "trickyInterpolation" : r"L'interpolation est délicate "
+    r"quand elle se termine une phrase comme ${s}.",
+  "message3" : "Caractères qui doivent être échapper, par exemple barres \\ "
+    "dollars \${ (les accolades sont ok), et xml/html réservés <& et "
+    "des citations \" "
+    "avec quelques paramètres ainsi \$a, \$b, et \$c",
+  "method" : "Cela vient d'une méthode",
+  "nonLambda" : "Cette méthode n'est pas un lambda",
+  "staticMessage" : "Cela vient d'une méthode statique",
+  "notAlwaysTranslated" : "Ce manque certaines traductions",
+  "thisNameIsNotInTheOriginal" : "Could this lead to something malicious?",
+  "originalNotInBMP" : "Anciens caractères grecs jeux du pendu: 𐅆𐅇.",
+  "plural" : """Une des choses difficiles est \${Intl.plural(num,
+      {
+        '0' : 'la forme plurielle',
+        '1' : 'la forme plurielle',
+        'other' : 'des formes plurielles'})}""",
+   "namedArgs" : "La chose est, \$thing",
+   "escapable" : "Escapes: \n\r\f\b\t\v."
+};
+
+/** A list of the German translations that we will produce. */
+var german = {
+  "types" : r"$a, $b, $c",
+  "multiLine" : "Dieser String erstreckt sich über mehrere Zeilen erstrecken.",
+  "message2" : r"Eine weitere Meldung mit dem Parameter $x",
+  "alwaysTranslated" : "Diese Zeichenkette wird immer übersetzt",
+  "message1" : "Dies ist eine Nachricht",
+  "leadingQuotes" : "\"Sogenannt\"",
+  "trickyInterpolation" :
+    r"Interpolation ist schwierig, wenn es einen Satz wie dieser endet ${s}.",
+  "message3" : "Zeichen, die Flucht benötigen, zB Schrägstriche \\ Dollar "
+    "\${ (geschweiften Klammern sind ok) und xml reservierte Zeichen <& und "
+    "Zitate \" Parameter \$a, \$b und \$c",
+  "method" : "Dies ergibt sich aus einer Methode",
+  "nonLambda" : "Diese Methode ist nicht eine Lambda",
+  "staticMessage" : "Dies ergibt sich aus einer statischen Methode",
+  "originalNotInBMP" : "Antike griechische Galgenmännchen Zeichen: 𐅆𐅇",
+  "plurals" : """\${Intl.plural(num,
+      {
+        '0' : 'Einer der knifflige Dinge ist der Plural',
+        '1' : 'Einer der knifflige Dinge ist der Plural',
+        'other' : 'Zu den kniffligen Dinge Pluralformen'
+      })}""",
+   "namedArgs" : "Die Sache ist, \$thing",
+   "escapable" : "Escapes: \n\r\f\b\t\v."
+};
+
+/** The output directory for translated files. */
+String targetDir;
+
+/**
+ * Generate a translated json version from [originals] in [locale] looking
+ * up the translations in [translations].
+ */
+void translate(List originals, String locale, Map translations) {
+  var translated = {"_locale" : locale};
+  for (var each in originals) {
+    var name = each["name"];
+    translated[name] = translations[name];
+  }
+  var file = new File(path.join(targetDir, 'translation_$locale.json'));
+  file.writeAsStringSync(json.stringify(translated));
+}
+
+main() {
+  var args = new Options().arguments;
+  if (args.length == 0) {
+    print('Usage: generate_hardcoded_translation [--output-dir=<dir>] '
+        '[originalFile.dart]');
+    exit(0);
+  }
+
+  targetDir = findOutputDirectory(args);
+  var fileArgs = args.where((x) => x.contains('.json'));
+
+  var messages = json.parse(new File(fileArgs.first).readAsStringSync());
+  translate(messages, "fr", french);
+  translate(messages, "de_DE", german);
+}