Add resource identifiers to package:messages

pkgs/messages/example_json/.gitignore

@@ -4,3 +4,4 @@
 
 # Conventional directory for build output.
 build/
+bin/example/

pkgs/messages/example_json/bin/example.dart

@@ -4,13 +4,10 @@
 
 // ignore_for_file: prefer_function_declarations_over_variables
 
-import 'dart:io';
-
-import 'package:example_json/testarbctx2.g.dart';
+import 'package:example_json/messages.g.dart';
 
 Future<void> main(List<String> arguments) async {
-  final messages =
-      AboutPageMessages((String id) async => File(id).readAsString());
+  final messages = AboutPageMessages();
   // final index = AboutPageMessagesEnum.aboutMessage;
 
   await messages.loadLocale('en');
@@ -26,6 +23,7 @@ Future<void> main(List<String> arguments) async {
   await messages.loadLocale('fr');
   print('AboutMessage fr:');
   print('\t${messages.aboutMessage('typesafe.fr')}');
+  print('\t${messages.helloAndWelcome('henry', 5)}');
 
   ///To enable this, add `generateFindById: true` to the pubspec section
   // print('\t${messages.getById('aboutMessage', ['get-by-id.fr'])}');

pkgs/messages/example_json/hook/build.dart

@@ -0,0 +1,22 @@
+// Copyright (c) 2024, 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.
+
+import 'package:messages_builder/hook.dart';
+import 'package:native_assets_cli/native_assets_cli.dart';
+
+void main(List<String> args) {
+  build(args, (config, output) async {
+    // final builder = MessagesDataBuilder.fromFiles(
+    //   [
+    //     'assets/l10n/testarb.arb',
+    //     'assets/l10n/testarb_de.arb',
+    //     'assets/l10n/testarbctx2.arb',
+    //     'assets/l10n/testarbctx2_fr.arb',
+    //   ],
+    // );
+    final builder = MessagesDataBuilder.fromFolder('assets/l10n/');
+
+    await builder.run(config: config, output: output, logger: null);
+  });
+}

pkgs/messages/example_json/lib/messages.g.dart

@@ -0,0 +1,172 @@
+// Generated by package:messages_builder.
+
+import 'dart:ffi';
+
+import 'package:intl4x/intl4x.dart';
+import 'package:messages/messages_json.dart';
+import 'package:meta/meta.dart';
+
+class AboutPageMessages {
+  AboutPageMessages();
+
+  String _currentLocale = 'en';
+
+  final Map<String, MessageList> _messages = {};
+
+  static const _dataFiles = {
+    'fr': ('package:example_json/assets/l10n/testarbctx2_fr.json', 'EyPjEJJU'),
+    'en': ('package:example_json/assets/l10n/testarbctx2.json', 'QrwRSsOy')
+  };
+
+  String get currentLocale => _currentLocale;
+
+  MessageList get _currentMessages => _messages[currentLocale]!;
+
+  static Iterable<String> get knownLocales => _dataFiles.keys;
+
+  Future<void> loadLocale(String locale) async {
+    if (!_messages.containsKey(locale)) {
+      final info = _dataFiles[locale];
+      final carb = info?.$1;
+      if (carb == null) {
+        throw ArgumentError('Locale $locale is not in $knownLocales');
+      }
+      final data = await AssetBundle.loadString(carb);
+      final messageList = MessageListJson.fromString(data, _pluralSelector);
+      if (messageList.preamble.hash != info?.$2) {
+        throw ArgumentError('''
+              Messages file for locale $locale has different hash "${messageList.preamble.hash}" than generated code "${info?.$2}".''');
+      }
+      _messages[locale] = messageList;
+    }
+    _currentLocale = locale;
+  }
+
+  void loadAllLocales() {
+    for (final locale in knownLocales) {
+      loadLocale(locale);
+    }
+  }
+
+  String aboutMessage(String websitename) =>
+      generateStringAtIndex(0, [websitename]);
+
+  String helloAndWelcome(
+    String firstName,
+    int lastName,
+  ) =>
+      generateStringAtIndex(1, [firstName, lastName]);
+
+  String newMessages(int newMessages) =>
+      generateStringAtIndex(2, [newMessages]);
+
+  String newMessages2(
+    String gender,
+    int newVar,
+  ) =>
+      generateStringAtIndex(3, [gender, newVar]);
+
+  String get otherMsg => generateStringAtIndex(4, []);
+}
+
+extension on AboutPageMessages {
+  @ResourceIdentifier('AboutPageMessages')
+  String generateStringAtIndex(
+    int index,
+    List args,
+  ) =>
+      _currentMessages.generateStringAtIndex(index, args);
+}
+
+class HomePageMessages {
+  HomePageMessages();
+
+  String _currentLocale = 'en';
+
+  final Map<String, MessageList> _messages = {};
+
+  static const _dataFiles = {
+    'de': ('package:example_json/assets/l10n/testarb_de.json', 'hbDN1MhX'),
+    'en': ('package:example_json/assets/l10n/testarb.json', 'dr9Md951')
+  };
+
+  String get currentLocale => _currentLocale;
+
+  MessageList get _currentMessages => _messages[currentLocale]!;
+
+  static Iterable<String> get knownLocales => _dataFiles.keys;
+
+  Future<void> loadLocale(String locale) async {
+    if (!_messages.containsKey(locale)) {
+      final info = _dataFiles[locale];
+      final carb = info?.$1;
+      if (carb == null) {
+        throw ArgumentError('Locale $locale is not in $knownLocales');
+      }
+      final data = await AssetBundle.loadString(carb);
+      final messageList = MessageListJson.fromString(data, _pluralSelector);
+      if (messageList.preamble.hash != info?.$2) {
+        throw ArgumentError('''
+              Messages file for locale $locale has different hash "${messageList.preamble.hash}" than generated code "${info?.$2}".''');
+      }
+      _messages[locale] = messageList;
+    }
+    _currentLocale = locale;
+  }
+
+  void loadAllLocales() {
+    for (final locale in knownLocales) {
+      loadLocale(locale);
+    }
+  }
+
+  String helloAndWelcome(
+    String firstName,
+    String lastName,
+  ) =>
+      generateStringAtIndex(0, [firstName, lastName]);
+
+  String helloAndWelcome2(
+    String firstName,
+    String lastName,
+  ) =>
+      generateStringAtIndex(1, [firstName, lastName]);
+
+  String newMessages(int newMessages) =>
+      generateStringAtIndex(2, [newMessages]);
+
+  String newMessages2(
+    String gender,
+    int newVar,
+  ) =>
+      generateStringAtIndex(3, [gender, newVar]);
+}
+
+extension on HomePageMessages {
+  @ResourceIdentifier('HomePageMessages')
+  String generateStringAtIndex(
+    int index,
+    List args,
+  ) =>
+      _currentMessages.generateStringAtIndex(index, args);
+}
+
+Message _pluralSelector(
+  num howMany,
+  String locale, {
+  required Message other,
+  Message? few,
+  Message? many,
+  Map<int, Message>? numberCases,
+  Map<int, Message>? wordCases,
+}) {
+  Message getCase(int i) => numberCases?[i] ?? wordCases?[i] ?? other;
+  return switch (Intl(locale: Locale.parse(locale)).plural().select(howMany)) {
+    PluralCategory.zero => getCase(0),
+    PluralCategory.one => getCase(1),
+    PluralCategory.two => getCase(2),
+    PluralCategory.few => few ?? other,
+    PluralCategory.many => many ?? other,
+    PluralCategory.other => other,
+  };
+}