| // Copyright 2014 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| import '../base/common.dart'; |
| import '../base/file_system.dart'; |
| import '../globals.dart' as globals; |
| import '../localizations/gen_l10n.dart'; |
| import '../localizations/gen_l10n_types.dart'; |
| import '../localizations/localizations_utils.dart'; |
| import '../runner/flutter_command.dart'; |
| |
| /// A command to generate localizations source files for a Flutter project. |
| /// |
| /// It generates Dart localization source files from arb files. |
| /// |
| /// For a more comprehensive tutorial on the tool, please see the |
| /// [internationalization user guide](flutter.dev/go/i18n-user-guide). |
| class GenerateLocalizationsCommand extends FlutterCommand { |
| GenerateLocalizationsCommand({ |
| FileSystem fileSystem, |
| }) : |
| _fileSystem = fileSystem { |
| argParser.addOption( |
| 'arb-dir', |
| defaultsTo: globals.fs.path.join('lib', 'l10n'), |
| help: 'The directory where the template and translated arb files are located.', |
| ); |
| argParser.addOption( |
| 'output-dir', |
| help: 'The directory where the generated localization classes will be written ' |
| 'if the synthetic-package flag is set to false.' |
| '\n\n' |
| 'If output-dir is specified and the synthetic-package flag is enabled, ' |
| 'this option will be ignored by the tool.' |
| '\n\n' |
| 'The app must import the file specified in the \'output-localization-file\' ' |
| 'option from this directory. If unspecified, this defaults to the same ' |
| 'directory as the input directory specified in \'arb-dir\'.', |
| ); |
| argParser.addOption( |
| 'template-arb-file', |
| defaultsTo: 'app_en.arb', |
| help: 'The template arb file that will be used as the basis for ' |
| 'generating the Dart localization and messages files.', |
| ); |
| argParser.addOption( |
| 'output-localization-file', |
| defaultsTo: 'app_localizations.dart', |
| help: 'The filename for the output localization and localizations ' |
| 'delegate classes.', |
| ); |
| argParser.addOption( |
| 'untranslated-messages-file', |
| help: 'The location of a file that describes the localization\n' |
| 'messages have not been translated yet. Using this option will create\n' |
| 'a JSON file at the target location, in the following format:\n\n' |
| '"locale": ["message_1", "message_2" ... "message_n"]\n\n' |
| 'If this option is not specified, a summary of the messages that\n' |
| 'have not been translated will be printed on the command line.' |
| ); |
| argParser.addOption( |
| 'output-class', |
| defaultsTo: 'AppLocalizations', |
| help: 'The Dart class name to use for the output localization and ' |
| 'localizations delegate classes.', |
| ); |
| argParser.addMultiOption( |
| 'preferred-supported-locales', |
| valueHelp: 'locale', |
| help: 'The list of preferred supported locales for the application. ' |
| 'By default, the tool will generate the supported locales list in ' |
| 'alphabetical order. Use this flag if you would like to default to ' |
| 'a different locale. \n\n' |
| 'For example, pass in `en_US` if you would like your app to ' |
| 'default to American English if a device supports it.' |
| '(Pass this option multiple times for defining multiple items', |
| ); |
| argParser.addOption( |
| 'header', |
| help: 'The header to prepend to the generated Dart localizations ' |
| 'files. This option takes in a string. \n\n' |
| 'For example, pass in "/// All localized files." if you would ' |
| 'like this string prepended to the generated Dart file. \n\n' |
| 'Alternatively, see the `header-file` option to pass in a text ' |
| 'file for longer headers.' |
| ); |
| argParser.addOption( |
| 'header-file', |
| help: 'The header to prepend to the generated Dart localizations ' |
| 'files. The value of this option is the name of the file that ' |
| 'contains the header text which will be inserted at the top ' |
| 'of each generated Dart file. \n\n' |
| 'Alternatively, see the `header` option to pass in a string ' |
| 'for a simpler header. \n\n' |
| 'This file should be placed in the directory specified in \'arb-dir\'.' |
| ); |
| argParser.addFlag( |
| 'use-deferred-loading', |
| defaultsTo: false, |
| help: 'Whether to generate the Dart localization file with locales imported' |
| ' as deferred, allowing for lazy loading of each locale in Flutter web.\n' |
| '\n' |
| 'This can reduce a web app’s initial startup time by decreasing the ' |
| 'size of the JavaScript bundle. When this flag is set to true, the ' |
| 'messages for a particular locale are only downloaded and loaded by the ' |
| 'Flutter app as they are needed. For projects with a lot of different ' |
| 'locales and many localization strings, it can be an performance ' |
| 'improvement to have deferred loading. For projects with a small number ' |
| 'of locales, the difference is negligible, and might slow down the start ' |
| 'up compared to bundling the localizations with the rest of the ' |
| 'application.\n\n' |
| 'Note that this flag does not affect other platforms such as mobile or ' |
| 'desktop.', |
| ); |
| argParser.addOption( |
| 'gen-inputs-and-outputs-list', |
| valueHelp: 'path-to-output-directory', |
| help: 'When specified, the tool generates a JSON file containing the ' |
| 'tool\'s inputs and outputs named gen_l10n_inputs_and_outputs.json.' |
| '\n\n' |
| 'This can be useful for keeping track of which files of the Flutter ' |
| 'project were used when generating the latest set of localizations. ' |
| 'For example, the Flutter tool\'s build system uses this file to ' |
| 'keep track of when to call gen_l10n during hot reload.\n\n' |
| 'The value of this option is the directory where the JSON file will be ' |
| 'generated.' |
| '\n\n' |
| 'When null, the JSON file will not be generated.' |
| ); |
| argParser.addFlag( |
| 'synthetic-package', |
| defaultsTo: true, |
| help: 'Determines whether or not the generated output files will be ' |
| 'generated as a synthetic package or at a specified directory in ' |
| 'the Flutter project.' |
| '\n\n' |
| 'This flag is set to true by default.' |
| '\n\n' |
| 'When synthetic-package is set to false, it will generate the ' |
| 'localizations files in the directory specified by arb-dir by default. ' |
| '\n\n' |
| 'If output-dir is specified, files will be generated there.', |
| ); |
| argParser.addOption( |
| 'project-dir', |
| valueHelp: 'absolute/path/to/flutter/project', |
| help: 'When specified, the tool uses the path passed into this option ' |
| 'as the directory of the root Flutter project.' |
| '\n\n' |
| 'When null, the relative path to the present working directory will be used.' |
| ); |
| } |
| |
| final FileSystem _fileSystem; |
| |
| @override |
| String get description => 'Generate localizations for the Flutter project.'; |
| |
| @override |
| String get name => 'gen-l10n'; |
| |
| @override |
| Future<FlutterCommandResult> runCommand() async { |
| |
| precacheLanguageAndRegionTags(); |
| |
| final String inputPathString = stringArg('arb-dir'); |
| final String outputPathString = stringArg('output-dir'); |
| final String outputFileString = stringArg('output-localization-file'); |
| final String templateArbFileName = stringArg('template-arb-file'); |
| final String untranslatedMessagesFile = stringArg('untranslated-messages-file'); |
| final String classNameString = stringArg('output-class'); |
| final List<String> preferredSupportedLocale = stringsArg('preferred-supported-locales'); |
| final String headerString = stringArg('header'); |
| final String headerFile = stringArg('header-file'); |
| final bool useDeferredLoading = boolArg('use-deferred-loading'); |
| final String inputsAndOutputsListPath = stringArg('gen-inputs-and-outputs-list'); |
| final bool useSyntheticPackage = boolArg('synthetic-package'); |
| final String projectPathString = stringArg('project-dir'); |
| |
| final LocalizationsGenerator localizationsGenerator = LocalizationsGenerator(_fileSystem); |
| |
| try { |
| localizationsGenerator |
| ..initialize( |
| inputPathString: inputPathString, |
| outputPathString: outputPathString, |
| templateArbFileName: templateArbFileName, |
| outputFileString: outputFileString, |
| classNameString: classNameString, |
| preferredSupportedLocale: preferredSupportedLocale, |
| headerString: headerString, |
| headerFile: headerFile, |
| useDeferredLoading: useDeferredLoading, |
| inputsAndOutputsListPath: inputsAndOutputsListPath, |
| useSyntheticPackage: useSyntheticPackage, |
| projectPathString: projectPathString, |
| ) |
| ..loadResources() |
| ..writeOutputFiles() |
| ..outputUnimplementedMessages(untranslatedMessagesFile, globals.logger); |
| } on L10nException catch (e) { |
| throwToolExit(e.message); |
| } |
| |
| return FlutterCommandResult.success(); |
| } |
| } |
