mirror of
https://github.com/flutter/flutter
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266 lines
8.6 KiB
Dart
266 lines
8.6 KiB
Dart
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:async';
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import 'dart:convert';
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import 'dart:io';
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import 'package:args/args.dart' as argslib;
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import 'package:meta/meta.dart';
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/// Simple data class to hold parsed locale. Does not promise validity of any data.
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class LocaleInfo implements Comparable<LocaleInfo> {
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LocaleInfo({
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this.languageCode,
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this.scriptCode,
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this.countryCode,
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this.length,
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this.originalString,
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});
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/// Simple parser. Expects the locale string to be in the form of 'language_script_COUNTRY'
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/// where the langauge is 2 characters, script is 4 characters with the first uppercase,
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/// and country is 2-3 characters and all uppercase.
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///
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/// 'language_COUNTRY' or 'language_script' are also valid. Missing fields will be null.
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factory LocaleInfo.fromString(String locale, {bool assume = false}) {
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final List<String> codes = locale.split('_'); // [language, script, country]
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assert(codes.isNotEmpty && codes.length < 4);
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final String languageCode = codes[0];
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String scriptCode;
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String countryCode;
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int length = codes.length;
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String originalString = locale;
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if (codes.length == 2) {
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scriptCode = codes[1].length >= 4 ? codes[1] : null;
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countryCode = codes[1].length < 4 ? codes[1] : null;
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} else if (codes.length == 3) {
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scriptCode = codes[1].length > codes[2].length ? codes[1] : codes[2];
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countryCode = codes[1].length < codes[2].length ? codes[1] : codes[2];
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}
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assert(codes[0] != null && codes[0].isNotEmpty);
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assert(countryCode == null || countryCode.isNotEmpty);
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assert(scriptCode == null || scriptCode.isNotEmpty);
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/// Adds scriptCodes to locales where we are able to assume it to provide
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/// finer granularity when resolving locales.
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///
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/// The basis of the assumptions here are based off of known usage of scripts
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/// across various countries. For example, we know Taiwan uses traditional (Hant)
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/// script, so it is safe to apply (Hant) to Taiwanese languages.
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if (assume && scriptCode == null) {
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switch (languageCode) {
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case 'zh': {
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if (countryCode == null) {
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scriptCode = 'Hans';
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}
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switch (countryCode) {
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case 'CN':
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case 'SG':
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scriptCode = 'Hans';
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break;
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case 'TW':
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case 'HK':
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case 'MO':
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scriptCode = 'Hant';
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break;
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}
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break;
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}
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case 'sr': {
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if (countryCode == null) {
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scriptCode = 'Cyrl';
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}
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break;
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}
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}
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// Increment length if we were able to assume a scriptCode.
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if (scriptCode != null) {
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length += 1;
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}
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// Update the base string to reflect assumed scriptCodes.
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originalString = languageCode;
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if (scriptCode != null)
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originalString += '_' + scriptCode;
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if (countryCode != null)
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originalString += '_' + countryCode;
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}
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return LocaleInfo(
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languageCode: languageCode,
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scriptCode: scriptCode,
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countryCode: countryCode,
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length: length,
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originalString: originalString,
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);
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}
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final String languageCode;
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final String scriptCode;
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final String countryCode;
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final int length; // The number of fields. Ranges from 1-3.
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final String originalString; // Original un-parsed locale string.
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@override
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bool operator ==(Object other) {
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if (!(other is LocaleInfo))
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return false;
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final LocaleInfo otherLocale = other;
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return originalString == otherLocale.originalString;
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}
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@override
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int get hashCode {
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return originalString.hashCode;
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}
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@override
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String toString() {
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return originalString;
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}
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@override
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int compareTo(LocaleInfo other) {
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return originalString.compareTo(other.originalString);
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}
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}
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void exitWithError(String errorMessage) {
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assert(errorMessage != null);
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stderr.writeln('fatal: $errorMessage');
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exit(1);
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}
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void checkCwdIsRepoRoot(String commandName) {
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final bool isRepoRoot = Directory('.git').existsSync();
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if (!isRepoRoot) {
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exitWithError(
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'$commandName must be run from the root of the Flutter repository. The '
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'current working directory is: ${Directory.current.path}'
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);
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}
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}
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String camelCase(LocaleInfo locale) {
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return locale.originalString
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.split('_')
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.map<String>((String part) => part.substring(0, 1).toUpperCase() + part.substring(1).toLowerCase())
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.join('');
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}
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GeneratorOptions parseArgs(List<String> rawArgs) {
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final argslib.ArgParser argParser = argslib.ArgParser()
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..addFlag(
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'overwrite',
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abbr: 'w',
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defaultsTo: false,
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);
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final argslib.ArgResults args = argParser.parse(rawArgs);
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final bool writeToFile = args['overwrite'];
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return GeneratorOptions(writeToFile: writeToFile);
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}
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class GeneratorOptions {
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GeneratorOptions({
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@required this.writeToFile,
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});
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final bool writeToFile;
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}
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const String registry = 'https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry';
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// See also //master/tools/gen_locale.dart in the engine repo.
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Map<String, List<String>> _parseSection(String section) {
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final Map<String, List<String>> result = <String, List<String>>{};
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List<String> lastHeading;
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for (String line in section.split('\n')) {
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if (line == '')
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continue;
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if (line.startsWith(' ')) {
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lastHeading[lastHeading.length - 1] = '${lastHeading.last}${line.substring(1)}';
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continue;
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}
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final int colon = line.indexOf(':');
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if (colon <= 0)
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throw 'not sure how to deal with "$line"';
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final String name = line.substring(0, colon);
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final String value = line.substring(colon + 2);
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lastHeading = result.putIfAbsent(name, () => <String>[]);
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result[name].add(value);
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}
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return result;
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}
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final Map<String, String> _languages = <String, String>{};
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final Map<String, String> _regions = <String, String>{};
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final Map<String, String> _scripts = <String, String>{};
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const String kProvincePrefix = ', Province of ';
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const String kParentheticalPrefix = ' (';
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/// Prepares the data for the [describeLocale] method below.
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///
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/// The data is obtained from the official IANA registry.
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Future<void> precacheLanguageAndRegionTags() async {
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final HttpClient client = HttpClient();
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final HttpClientRequest request = await client.getUrl(Uri.parse(registry));
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final HttpClientResponse response = await request.close();
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final String body = (await response.transform<String>(utf8.decoder).toList()).join('');
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client.close(force: true);
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final List<Map<String, List<String>>> sections = body.split('%%').skip(1).map<Map<String, List<String>>>(_parseSection).toList();
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for (Map<String, List<String>> section in sections) {
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assert(section.containsKey('Type'), section.toString());
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final String type = section['Type'].single;
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if (type == 'language' || type == 'region' || type == 'script') {
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assert(section.containsKey('Subtag') && section.containsKey('Description'), section.toString());
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final String subtag = section['Subtag'].single;
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String description = section['Description'].join(' ');
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if (description.startsWith('United '))
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description = 'the $description';
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if (description.contains(kParentheticalPrefix))
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description = description.substring(0, description.indexOf(kParentheticalPrefix));
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if (description.contains(kProvincePrefix))
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description = description.substring(0, description.indexOf(kProvincePrefix));
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if (description.endsWith(' Republic'))
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description = 'the $description';
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switch (type) {
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case 'language':
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_languages[subtag] = description;
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break;
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case 'region':
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_regions[subtag] = description;
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break;
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case 'script':
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_scripts[subtag] = description;
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break;
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}
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}
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}
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}
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String describeLocale(String tag) {
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final List<String> subtags = tag.split('_');
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assert(subtags.isNotEmpty);
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assert(_languages.containsKey(subtags[0]));
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final String language = _languages[subtags[0]];
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String output = '$language';
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String region;
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String script;
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if (subtags.length == 2) {
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region = _regions[subtags[1]];
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script = _scripts[subtags[1]];
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assert(region != null || script != null);
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} else if (subtags.length >= 3) {
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region = _regions[subtags[2]];
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script = _scripts[subtags[1]];
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assert(region != null && script != null);
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}
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if (region != null)
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output += ', as used in $region';
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if (script != null)
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output += ', using the $script script';
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return output;
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} |