blob: a154a8f2d9a738de23425cd5c0dd570efbfc7aa4 [file] [log] [blame] [edit]
// Copyright 2013 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.
// This file is used to generate the switch statements in the Locale class.
// See: ../lib/ui/window.dart
// When running this script, use the output of this script to update the
// comments that say when the script was last run (that comment appears twice in
// window.dart), and then replace all the map entries with the output from
// this script (the first set for _canonicalizeLanguageCode and the second set
// for _canonicalizeRegionCode).
// ignore_for_file: avoid_print
import 'dart:async';
import 'dart:convert';
import 'dart:io';
const String registry = 'https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry';
Map<String, List<String>> parseSection(String section) {
final Map<String, List<String>> result = <String, List<String>>{};
late List<String> lastHeading;
for (final String line in section.split('\n')) {
if (line == '') {
continue;
}
if (line.startsWith(' ')) {
lastHeading[lastHeading.length - 1] = '${lastHeading.last}${line.substring(1)}';
continue;
}
final int colon = line.indexOf(':');
if (colon <= 0) {
throw StateError('not sure how to deal with "$line"');
}
final String name = line.substring(0, colon);
final String value = line.substring(colon + 2);
lastHeading = result.putIfAbsent(name, () => <String>[])..add(value);
}
return result;
}
Future<void> main() async {
final HttpClient client = HttpClient();
final String body = (await (await (await client.getUrl(Uri.parse(registry))).close()).transform(utf8.decoder).toList()).join();
final List<Map<String, List<String>>> sections = body.split('%%').map<Map<String, List<String>>>(parseSection).toList();
final Map<String, List<String>> outputs = <String, List<String>>{'language': <String>[], 'region': <String>[]};
String? fileDate;
for (final Map<String, List<String>> section in sections) {
if (fileDate == null) {
// first block should contain a File-Date metadata line.
fileDate = section['File-Date']!.single;
continue;
}
assert(section.containsKey('Type'), section.toString());
final String type = section['Type']!.single;
if ((type == 'language' || type == 'region') && (section.containsKey('Preferred-Value'))) {
assert(section.containsKey('Subtag'), section.toString());
final String subtag = section['Subtag']!.single;
final List<String> descriptions = section['Description']!;
assert(descriptions.isNotEmpty);
assert(section.containsKey('Deprecated'));
final String comment = section.containsKey('Comment') ? section['Comment']!.single : 'deprecated ${section['Deprecated']!.single}';
final String preferredValue = section['Preferred-Value']!.single;
outputs[type]!.add("'$subtag': '$preferredValue', // ${descriptions.join(", ")}; $comment");
}
}
print('// Mappings generated for language subtag registry as of $fileDate.');
print('// For languageCode:');
print(outputs['language']!.join('\n'));
print('// For regionCode:');
print(outputs['region']!.join('\n'));
}