packages/wyatt_i18n/example/lib/main.dart

@@ -43,14 +43,30 @@ class App extends StatelessWidget {
                 // test
                 const I18nDataSource dataSource = AssetsFileDataSourceImpl();
 
-                const I18nRepository repository =
-                    I18RepositoryImpl(dataSource: dataSource);
+                final I18nRepository repository =
+                    I18nRepositoryImpl(dataSource: dataSource);
 
-                final test = (await repository.load('en')).ok;
+                final test1 = (await repository.load(locale: 'en')).ok;
+                // final test2 = (await repository.loadFrom(
+                //   Uri.parse('assets/i18n.en.yaml'),
+                //   parser: const YamlParser(),
+                // ))
+                //     .ok;
 
-                print(test?.locale);
-                print(test?.data);
-                print(test?.data['btnAddFile']);
+                // print(test1?.locale);
+                // print(test1?.data);
+                // print(test1?.data['btnAddFile']);
+
+                final text = repository.get('youHavePushed', {
+                  'count': 8,
+                });
+
+                print(text.ok);
+
+
+                // print(test2?.locale);
+                // print(test2?.data);
+                // print(test2?.data['btnAddFile']);
 
                 return 'test';
               }),

packages/wyatt_i18n/lib/src/core/utils/i18n_parser.dart

@@ -0,0 +1,135 @@
+// Copyright (C) 2023 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program 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 of the License, or
+// any later version.
+//
+// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:collection/collection.dart';
+import 'package:intl/intl.dart';
+import 'package:wyatt_i18n/src/core/utils/icu_parser.dart';
+import 'package:wyatt_i18n/src/domain/entities/tokens.dart';
+import 'package:wyatt_i18n/wyatt_i18n.dart';
+
+class I18nParser extends Parser<String, String> {
+  const I18nParser({
+    required this.i18n,
+    this.arguments = const {},
+  }) : super();
+
+  final I18n i18n;
+  final Map<String, dynamic> arguments;
+
+  dynamic getArgument(String key) {
+    final arg = arguments[key];
+    if (arg == null) {
+      throw ArgumentsRequiredException(key, 'value');
+    }
+
+    return arg;
+  }
+
+  String pluralToString(Plural token) {
+    final List<Option?> options = token.options;
+    final zero =
+        options.firstWhereOrNull((o) => o!.name == 'zero' || o.name == '=0');
+    final one =
+        options.firstWhereOrNull((o) => o!.name == 'one' || o.name == '=1');
+    final two =
+        options.firstWhereOrNull((o) => o!.name == 'two' || o.name == '=2');
+    final few = options.firstWhereOrNull((o) => o!.name == 'few');
+    final many = options.firstWhereOrNull((o) => o!.name == 'many');
+    final other = options.firstWhereOrNull((o) => o!.name == 'other');
+    final zeroStr = zero?.value.map(parsedElementToString).join() ?? '';
+    final oneStr = one?.value.map(parsedElementToString).join() ?? '';
+    final twoStr = two?.value.map(parsedElementToString).join() ?? '';
+    final fewStr = few?.value.map(parsedElementToString).join() ?? '';
+    final manyStr = many?.value.map(parsedElementToString).join() ?? '';
+    final otherStr = other?.value.map(parsedElementToString).join() ?? '';
+
+    return Intl.plural(
+      getArgument(token.value) as num,
+      zero: zeroStr,
+      two: twoStr,
+      one: oneStr,
+      few: fewStr,
+      other: otherStr,
+      many: manyStr,
+    );
+  }
+
+  String genderToString(Gender token) {
+    final List<Option?> options = token.options;
+    final other = options.firstWhereOrNull((o) => o!.name == 'other');
+    final male = options.firstWhereOrNull((o) => o!.name == 'male');
+    final female = options.firstWhereOrNull((o) => o!.name == 'female');
+    final otherStr = other?.value.map(parsedElementToString).join() ?? '';
+    final maleStr = male?.value.map(parsedElementToString).join() ?? '';
+    final femaleStr = female?.value.map(parsedElementToString).join() ?? '';
+
+    return Intl.gender(
+      getArgument(token.value) as String,
+      other: otherStr,
+      female: femaleStr,
+      male: maleStr,
+    );
+  }
+
+  String selectToString(Select token) {
+    final Map<Object, String> cases = {
+      for (var e in token.options.map(
+        (o) => MapEntry(
+          o.name,
+          o.value.map(parsedElementToString).join(),
+        ),
+      ))
+        e.key: e.value,
+    };
+
+    return Intl.select(
+      getArgument(token.value) as String,
+      cases,
+    );
+  }
+
+  String parsedElementToString(Token token) {
+    switch (token.type) {
+      case TokenType.literal:
+        return token.value;
+      case TokenType.plural:
+        return pluralToString(token as Plural);
+      case TokenType.gender:
+        return genderToString(token as Gender);
+      case TokenType.argument:
+        return getArgument(token.value).toString();
+      case TokenType.select:
+        return selectToString(token as Select);
+    }
+  }
+
+  @override
+  String parse(String input, {String? key}) {
+    String? result;
+    try {
+      result = IcuParser().parse(input)?.map(parsedElementToString).join();
+      if (result == null) {
+        throw MalformedValueException(key ?? '', input);
+      }
+    } on ArgumentsRequiredException catch (_) {
+      rethrow;
+    } catch (e) {
+      throw MalformedValueException(key ?? '', input);
+    }
+
+    return result;
+  }
+}

packages/wyatt_i18n/lib/src/core/utils/icu_parser.dart

@@ -0,0 +1,173 @@
+// Copyright (C) 2023 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program 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 of the License, or
+// any later version.
+//
+// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+
+// ignore_for_file: avoid_dynamic_calls, inference_failure_on_untyped_parameter
+
+import 'package:petitparser/petitparser.dart' hide Token;
+import 'package:wyatt_i18n/src/domain/entities/tokens.dart';
+
+class IcuParser {
+  IcuParser() {
+    // There is a cycle here, so we need the explicit
+    // set to avoid infinite recursion.
+    interiorText.set(contents.plus() | empty);
+  }
+  Parser get openCurly => char('{');
+
+  Parser get closeCurly => char('}');
+
+  Parser get quotedCurly => (string("'{'") | string("'}'")).map((x) => x[1]);
+
+  Parser get icuEscapedText => quotedCurly | twoSingleQuotes;
+
+  Parser get curly => openCurly | closeCurly;
+
+  Parser get notAllowedInIcuText => curly | char('<');
+
+  Parser get icuText => notAllowedInIcuText.neg();
+
+  Parser get notAllowedInNormalText => char('{');
+
+  Parser get normalText => notAllowedInNormalText.neg();
+
+  Parser get messageText =>
+      (icuEscapedText | icuText).plus().flatten().map(Literal.new);
+
+  Parser get nonIcuMessageText => normalText.plus().flatten().map(Literal.new);
+
+  Parser get twoSingleQuotes => string("''").map((x) => "'");
+
+  Parser get number => digit().plus().flatten().trim().map(int.parse);
+
+  Parser get id => (letter() & (word() | char('_')).star()).flatten().trim();
+
+  Parser get comma => char(',').trim();
+
+  /// Given a list of possible keywords, return a rule that accepts any of them.
+  /// e.g., given ["male", "female", "other"], accept any of them.
+  Parser asKeywords(List<String> list) =>
+      list.map(string).cast<Parser>().reduce((a, b) => a | b).flatten().trim();
+
+  Parser get pluralKeyword => asKeywords(
+        ['=0', '=1', '=2', 'zero', 'one', 'two', 'few', 'many', 'other'],
+      );
+
+  Parser get genderKeyword => asKeywords(['female', 'male', 'other']);
+
+  SettableParser<dynamic> interiorText = undefined();
+
+  Parser get preface => (openCurly & id & comma).map((values) => values[1]);
+
+  Parser get pluralLiteral => string('plural');
+
+  Parser get pluralClause =>
+      (pluralKeyword & openCurly & interiorText & closeCurly).trim().map(
+            (result) => Option(
+              result[0] as String,
+              List<Token>.from(
+                (result[2] is List ? result[2] as List : [result[2]])
+                    .cast<Token>(),
+              ),
+            ),
+          );
+
+  Parser get plural =>
+      preface & pluralLiteral & comma & pluralClause.plus() & closeCurly;
+
+  Parser get intlPlural => plural.map(
+        (result) => Plural(
+          result[0] as String,
+          List<Option>.from(result[3] as Iterable<dynamic>),
+        ),
+      );
+
+  Parser get selectLiteral => string('select');
+
+  Parser get genderClause =>
+      (genderKeyword & openCurly & interiorText & closeCurly).trim().map(
+            (result) => Option(
+              result[0] as String,
+              List<Token>.from(
+                (result[2] is List ? result[2] as List : [result[2]])
+                    .cast<Token>(),
+              ),
+            ),
+          );
+
+  Parser get gender =>
+      preface & selectLiteral & comma & genderClause.plus() & closeCurly;
+
+  Parser get intlGender => gender.map(
+        (result) => Gender(
+          result[0] as String,
+          List<Option>.from(result[3] as Iterable<dynamic>),
+        ),
+      );
+
+  Parser get selectClause =>
+      (id & openCurly & interiorText & closeCurly).trim().map(
+            (result) => Option(
+              result[0] as String,
+              List<Token>.from(
+                (result[2] is List ? result[2] as List : [result[2]])
+                    .cast<Token>(),
+              ),
+            ),
+          );
+
+  Parser get generalSelect =>
+      preface & selectLiteral & comma & selectClause.plus() & closeCurly;
+
+  Parser get intlSelect => generalSelect.map(
+        (result) => Select(
+          result[0] as String,
+          List<Option>.from(result[3] as Iterable<dynamic>),
+        ),
+      );
+
+  Parser get compound => (((parameter | nonIcuMessageText).plus() &
+              pluralOrGenderOrSelect &
+              (pluralOrGenderOrSelect | parameter | nonIcuMessageText).star()) |
+          (pluralOrGenderOrSelect &
+              (pluralOrGenderOrSelect | parameter | nonIcuMessageText).plus()))
+      .map((result) => result.expand((x) => x is List ? x : [x]).toList());
+
+  Parser get pluralOrGenderOrSelect => intlPlural | intlGender | intlSelect;
+
+  Parser get contents => pluralOrGenderOrSelect | parameter | messageText;
+
+  Parser get simpleText =>
+      (nonIcuMessageText | parameter | openCurly).plus().map(
+            (result) => result
+                .map((item) => item is String ? Literal(item) : item)
+                .toList(),
+          );
+
+  Parser get empty => epsilon().map((_) => Literal(''));
+
+  Parser get parameter => (openCurly & id & closeCurly)
+      .map((result) => Argument(result[1] as String));
+
+  List<Token>? parse(String message) {
+    final parsed = (compound | pluralOrGenderOrSelect | simpleText | empty)
+        .map(
+          (result) => List<Token>.from(result is List ? result : [result]),
+        )
+        .parse(message);
+
+    return parsed.isSuccess ? parsed.value : null;
+  }
+}

packages/wyatt_i18n/lib/src/core/utils/utils.dart

@@ -15,6 +15,8 @@
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 export 'arb_parser.dart';
+export 'i18n_parser.dart';
+export 'icu_parser.dart';
 export 'json_parser.dart';
 export 'parser.dart';
 export 'yaml_parser.dart';

packages/wyatt_i18n/lib/src/data/data.dart

@@ -16,4 +16,4 @@
 
 export 'data_sources/assets_file_data_source_impl.dart';
 export 'data_sources/network_data_source_impl.dart';
-export 'repositories/i18_repository_impl.dart';
+export 'repositories/i18n_repository_impl.dart';

packages/wyatt_i18n/lib/src/data/repositories/i18n_repository_impl.dart

@@ -15,15 +15,17 @@
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 import 'package:wyatt_architecture/wyatt_architecture.dart';
+import 'package:wyatt_i18n/src/core/utils/i18n_parser.dart';
 import 'package:wyatt_i18n/wyatt_i18n.dart';
-import 'package:wyatt_type_utils/wyatt_type_utils.dart';
+import 'package:wyatt_type_utils/wyatt_type_utils.dart' hide Option;
 
-class I18RepositoryImpl extends I18nRepository {
-  const I18RepositoryImpl({
+class I18nRepositoryImpl extends I18nRepository {
+  I18nRepositoryImpl({
     required this.dataSource,
   }) : super();
 
   final I18nDataSource dataSource;
+  I18n _i18n = const I18n.empty();
 
   Future<I18n> _parse(
     String content,
@@ -81,7 +83,7 @@ class I18RepositoryImpl extends I18nRepository {
         () async {
           final content = await dataSource.load(locale: locale);
 
-          return _parse(
+          return _i18n = await _parse(
             content,
             parser ?? dataSource.format.parser,
             locale: locale,
@@ -102,7 +104,7 @@ class I18RepositoryImpl extends I18nRepository {
 
           /// Strict is always true when loading from a uri. Because
           /// the locale is not given and can't be inferred.
-          return _parse(
+          return _i18n = await _parse(
             content,
             parser ?? dataSource.format.parser,
             strict: true,
@@ -116,7 +118,15 @@ class I18RepositoryImpl extends I18nRepository {
     String key, [
     Map<String, dynamic> arguments = const {},
   ]) {
-    // TODO: implement get
-    throw UnimplementedError();
+    final I18nParser parser = I18nParser(i18n: _i18n, arguments: arguments);
+
+    if (_i18n.containsKey(key)) {
+      return Result.tryCatch<String, AppException, AppException>(
+        () => parser.parse(_i18n[key] as String, key: key),
+        (error) => error,
+      );
+    } else {
+      throw KeyNotFoundException(key, arguments);
+    }
   }
 }

packages/wyatt_i18n/lib/src/domain/entities/i18n.dart

@@ -24,6 +24,9 @@ class I18n extends Entity {
     required this.data,
   }) : super();
 
+  /// Creates an empty i18n file.
+  const I18n.empty() : this(locale: '', unparsedData: '', data: const {});
+
   /// The locale of the i18n file.
   final String locale;
 
@@ -33,13 +36,7 @@ class I18n extends Entity {
   /// The data of the i18n file.
   final Map<String, dynamic> data;
 
-  String operator [](String key) {
-    final value = data[key];
+  bool containsKey(String key) => data.containsKey(key);
 
-    if (value is String) {
-      return value;
-    } else {
-      throw Exception('Invalid i18n key: $key');
-    }
-  }
+  dynamic operator [](String key) => data[key];
 }

packages/wyatt_i18n/lib/src/domain/entities/tokens.dart

@@ -0,0 +1,52 @@
+// Copyright (C) 2023 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program 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 of the License, or
+// any later version.
+//
+// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+
+enum TokenType { literal, argument, plural, gender, select }
+
+class Token {
+  Token(this.type, this.value);
+  TokenType type;
+  String value;
+}
+
+class Option {
+  Option(this.name, this.value);
+  String name;
+  List<Token> value;
+}
+
+class Literal extends Token {
+  Literal(String value) : super(TokenType.literal, value);
+}
+
+class Argument extends Token {
+  Argument(String value) : super(TokenType.argument, value);
+}
+
+class Gender extends Token {
+  Gender(String value, this.options) : super(TokenType.gender, value);
+  List<Option> options;
+}
+
+class Plural extends Token {
+  Plural(String value, this.options) : super(TokenType.plural, value);
+  List<Option> options;
+}
+
+class Select extends Token {
+  Select(String value, this.options) : super(TokenType.select, value);
+  List<Option> options;
+}

packages/wyatt_i18n/pubspec.yaml

@@ -7,7 +7,9 @@ environment:
   sdk: ">=2.19.0 <3.0.0"
 
 dependencies:
+  collection: ^1.17.0
   flutter: {sdk: flutter}
+  intl: ^0.18.0
   path: ^1.8.0
   petitparser: ^5.1.0
   wyatt_architecture: