302 lines
9.7 KiB
Dart
302 lines
9.7 KiB
Dart
// Copyright 2014 The Flutter 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 'package:meta/meta.dart';
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import '../base/file_system.dart';
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import 'language_subtag_registry.dart';
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typedef HeaderGenerator = String Function(String regenerateInstructions);
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typedef ConstructorGenerator = String Function(LocaleInfo locale);
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int sortFilesByPath (File a, File b) {
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return a.path.compareTo(b.path);
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}
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/// Simple data class to hold parsed locale. Does not promise validity of any data.
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@immutable
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class LocaleInfo implements Comparable<LocaleInfo> {
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const 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 language 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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///
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/// When `deriveScriptCode` is true, if [scriptCode] was unspecified, it will
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/// be derived from the [languageCode] and [countryCode] if possible.
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factory LocaleInfo.fromString(String locale, { bool deriveScriptCode = 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 (deriveScriptCode && 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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}
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if (countryCode != null) {
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originalString += '_' + countryCode;
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}
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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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String camelCase() {
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return 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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@override
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bool operator ==(Object other) {
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return other is LocaleInfo
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&& other.originalString == 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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// 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 (final String line in section.split('\n')) {
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if (line == '') {
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continue;
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}
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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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}
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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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void precacheLanguageAndRegionTags() {
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final List<Map<String, List<String>>> sections =
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languageSubtagRegistry.split('%%').skip(1).map<Map<String, List<String>>>(_parseSection).toList();
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for (final 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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}
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if (description.contains(kParentheticalPrefix)) {
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description = description.substring(0, description.indexOf(kParentheticalPrefix));
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}
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if (description.contains(kProvincePrefix)) {
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description = description.substring(0, description.indexOf(kProvincePrefix));
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}
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if (description.endsWith(' Republic')) {
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description = 'the $description';
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}
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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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}
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if (script != null) {
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output += ', using the $script script';
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}
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return output;
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}
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/// Return the input string as a Dart-parsable string.
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///
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/// ```
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/// foo => 'foo'
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/// foo "bar" => 'foo "bar"'
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/// foo 'bar' => "foo 'bar'"
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/// foo 'bar' "baz" => '''foo 'bar' "baz"'''
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/// ```
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///
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/// This function is used by tools that take in a JSON-formatted file to
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/// generate Dart code. For this reason, characters with special meaning
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/// in JSON files. For example, the backspace character (\b) have to be
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/// properly escaped by this function so that the generated Dart code
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/// correctly represents this character:
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/// ```
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/// foo\bar => 'foo\\bar'
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/// foo\nbar => 'foo\\nbar'
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/// foo\\nbar => 'foo\\\\nbar'
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/// foo\\bar => 'foo\\\\bar'
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/// foo\ bar => 'foo\\ bar'
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/// foo$bar = 'foo\$bar'
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/// ```
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String generateString(String value) {
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if (<String>['\n', '\f', '\t', '\r', '\b'].every((String pattern) => !value.contains(pattern))) {
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final bool hasDollar = value.contains(r'$');
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final bool hasBackslash = value.contains(r'\');
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final bool hasQuote = value.contains("'");
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final bool hasDoubleQuote = value.contains('"');
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if (!hasQuote) {
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return hasBackslash || hasDollar ? "r'$value'" : "'$value'";
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}
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if (!hasDoubleQuote) {
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return hasBackslash || hasDollar ? 'r"$value"' : '"$value"';
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}
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}
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const String backslash = '__BACKSLASH__';
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assert(
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!value.contains(backslash),
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'Input string cannot contain the sequence: '
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'"__BACKSLASH__", as it is used as part of '
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'backslash character processing.'
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);
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value = value
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// Replace backslashes with a placeholder for now to properly parse
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// other special characters.
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.replaceAll(r'\', backslash)
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.replaceAll(r'$', r'\$')
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.replaceAll("'", r"\'")
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.replaceAll('"', r'\"')
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.replaceAll('\n', r'\n')
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.replaceAll('\f', r'\f')
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.replaceAll('\t', r'\t')
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.replaceAll('\r', r'\r')
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.replaceAll('\b', r'\b')
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// Reintroduce escaped backslashes into generated Dart string.
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.replaceAll(backslash, r'\\');
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return "'$value'";
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}
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