blob: ff3624ec9569b6c4dde537d73bc8f901510b6482 [file] [log] [blame]
// 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.
// This program generates a getMaterialTranslation() and a
// getCupertinoTranslation() function that look up the translations provided by
// the arb files. The returned value is a generated instance of a
// GlobalMaterialLocalizations or a GlobalCupertinoLocalizations that
// corresponds to a single locale.
//
// The *.arb files are in packages/flutter_localizations/lib/src/l10n.
//
// The arb (JSON) format files must contain a single map indexed by locale.
// Each map value is itself a map with resource identifier keys and localized
// resource string values.
//
// The arb filenames are expected to have the form "material_(\w+)\.arb" or
// "cupertino_(\w+)\.arb" where the group following "_" identifies the language
// code and the country code, e.g. "material_en.arb" or "material_en_GB.arb".
// In most cases both codes are just two characters.
//
// This app is typically run by hand when a module's .arb files have been
// updated.
//
// ## Usage
//
// Run this program from the root of the git repository.
//
// The following outputs the generated Dart code to the console as a dry run:
//
// ```
// dart dev/tools/localization/bin/gen_localizations.dart
// ```
//
// If the data looks good, use the `-w` or `--overwrite` option to overwrite the
// packages/flutter_localizations/lib/src/l10n/generated_material_localizations.dart
// and packages/flutter_localizations/lib/src/l10n/generated_cupertino_localizations.dart file:
//
// ```
// dart dev/tools/localization/bin/gen_localizations.dart --overwrite
// ```
import 'dart:io';
import 'package:path/path.dart' as path;
import '../gen_cupertino_localizations.dart';
import '../gen_material_localizations.dart';
import '../localizations_utils.dart';
import '../localizations_validator.dart';
import 'encode_kn_arb_files.dart';
/// This is the core of this script; it generates the code used for translations.
String generateArbBasedLocalizationSubclasses({
required Map<LocaleInfo, Map<String, String>> localeToResources,
required Map<LocaleInfo, Map<String, dynamic>> localeToResourceAttributes,
required String generatedClassPrefix,
required String baseClass,
required HeaderGenerator generateHeader,
required ConstructorGenerator generateConstructor,
required String factoryName,
required String factoryDeclaration,
required String factoryArguments,
required String supportedLanguagesConstant,
required String supportedLanguagesDocMacro,
}) {
assert(localeToResources != null);
assert(localeToResourceAttributes != null);
assert(generatedClassPrefix.isNotEmpty);
assert(baseClass.isNotEmpty);
assert(generateHeader != null);
assert(generateConstructor != null);
assert(factoryName.isNotEmpty);
assert(factoryDeclaration.isNotEmpty);
assert(factoryArguments.isNotEmpty);
assert(supportedLanguagesConstant.isNotEmpty);
assert(supportedLanguagesDocMacro.isNotEmpty);
final StringBuffer output = StringBuffer();
output.writeln(generateHeader('dart dev/tools/localization/bin/gen_localizations.dart --overwrite'));
final StringBuffer supportedLocales = StringBuffer();
final Map<String, List<LocaleInfo>> languageToLocales = <String, List<LocaleInfo>>{};
final Map<String, Set<String>> languageToScriptCodes = <String, Set<String>>{};
// Used to calculate if there are any corresponding countries for a given language and script.
final Map<LocaleInfo, Set<String>> languageAndScriptToCountryCodes = <LocaleInfo, Set<String>>{};
final Set<String> allResourceIdentifiers = <String>{};
for (final LocaleInfo locale in localeToResources.keys.toList()..sort()) {
if (locale.scriptCode != null) {
languageToScriptCodes[locale.languageCode] ??= <String>{};
languageToScriptCodes[locale.languageCode]!.add(locale.scriptCode!);
}
if (locale.countryCode != null && locale.scriptCode != null) {
final LocaleInfo key = LocaleInfo.fromString('${locale.languageCode}_${locale.scriptCode}');
languageAndScriptToCountryCodes[key] ??= <String>{};
languageAndScriptToCountryCodes[key]!.add(locale.countryCode!);
}
languageToLocales[locale.languageCode] ??= <LocaleInfo>[];
languageToLocales[locale.languageCode]!.add(locale);
allResourceIdentifiers.addAll(localeToResources[locale]!.keys.toList()..sort());
}
// We generate one class per supported language (e.g.
// `MaterialLocalizationEn`). These implement everything that is needed by the
// superclass (e.g. GlobalMaterialLocalizations).
// We also generate one subclass for each locale with a script code (e.g.
// `MaterialLocalizationZhHant`). Their superclasses are the aforementioned
// language classes for the same locale but without a script code (e.g.
// `MaterialLocalizationZh`).
// We also generate one subclass for each locale with a country code (e.g.
// `MaterialLocalizationEnGb`). Their superclasses are the aforementioned
// language classes for the same locale but without a country code (e.g.
// `MaterialLocalizationEn`).
// If scriptCodes for a language are defined, we expect a scriptCode to be
// defined for locales that contain a countryCode. The superclass becomes
// the script subclass (e.g. `MaterialLocalizationZhHant`) and the generated
// subclass will also contain the script code (e.g. `MaterialLocalizationZhHantTW`).
// When scriptCodes are not defined for languages that use scriptCodes to distinguish
// between significantly differing scripts, we assume the scriptCodes in the
// [LocaleInfo.fromString] factory and add it to the [LocaleInfo]. We then generate
// the script classes based on the first locale that we assume to use the script.
final List<String> allKeys = allResourceIdentifiers.toList()..sort();
final List<String> languageCodes = languageToLocales.keys.toList()..sort();
final LocaleInfo canonicalLocale = LocaleInfo.fromString('en');
for (final String languageName in languageCodes) {
final LocaleInfo languageLocale = LocaleInfo.fromString(languageName);
output.writeln(generateClassDeclaration(languageLocale, generatedClassPrefix, baseClass));
output.writeln(generateConstructor(languageLocale));
final Map<String, String> languageResources = localeToResources[languageLocale]!;
for (final String key in allKeys) {
final Map<String, dynamic>? attributes = localeToResourceAttributes[canonicalLocale]![key] as Map<String, dynamic>?;
output.writeln(generateGetter(key, languageResources[key], attributes, languageLocale));
}
output.writeln('}');
int countryCodeCount = 0;
int scriptCodeCount = 0;
if (languageToScriptCodes.containsKey(languageName)) {
scriptCodeCount = languageToScriptCodes[languageName]!.length;
// Language has scriptCodes, so we need to properly fallback countries to corresponding
// script default values before language default values.
for (final String scriptCode in languageToScriptCodes[languageName]!) {
final LocaleInfo scriptBaseLocale = LocaleInfo.fromString('${languageName}_$scriptCode');
output.writeln(generateClassDeclaration(
scriptBaseLocale,
generatedClassPrefix,
'$generatedClassPrefix${languageLocale.camelCase()}',
));
output.writeln(generateConstructor(scriptBaseLocale));
final Map<String, String> scriptResources = localeToResources[scriptBaseLocale]!;
for (final String key in scriptResources.keys.toList()..sort()) {
if (languageResources[key] == scriptResources[key])
continue;
final Map<String, dynamic>? attributes = localeToResourceAttributes[canonicalLocale]![key] as Map<String, dynamic>?;
output.writeln(generateGetter(key, scriptResources[key], attributes, languageLocale));
}
output.writeln('}');
final List<LocaleInfo> localeCodes = languageToLocales[languageName]!..sort();
for (final LocaleInfo locale in localeCodes) {
if (locale.originalString == languageName)
continue;
if (locale.originalString == '${languageName}_$scriptCode')
continue;
if (locale.scriptCode != scriptCode)
continue;
countryCodeCount += 1;
output.writeln(generateClassDeclaration(
locale,
generatedClassPrefix,
'$generatedClassPrefix${scriptBaseLocale.camelCase()}',
));
output.writeln(generateConstructor(locale));
final Map<String, String> localeResources = localeToResources[locale]!;
for (final String key in localeResources.keys) {
// When script fallback contains the key, we compare to it instead of language fallback.
if (scriptResources.containsKey(key) ? scriptResources[key] == localeResources[key] : languageResources[key] == localeResources[key])
continue;
final Map<String, dynamic>? attributes = localeToResourceAttributes[canonicalLocale]![key] as Map<String, dynamic>?;
output.writeln(generateGetter(key, localeResources[key], attributes, languageLocale));
}
output.writeln('}');
}
}
} else {
// No scriptCode. Here, we do not compare against script default (because it
// doesn't exist).
final List<LocaleInfo> localeCodes = languageToLocales[languageName]!..sort();
for (final LocaleInfo locale in localeCodes) {
if (locale.originalString == languageName)
continue;
countryCodeCount += 1;
final Map<String, String> localeResources = localeToResources[locale]!;
output.writeln(generateClassDeclaration(
locale,
generatedClassPrefix,
'$generatedClassPrefix${languageLocale.camelCase()}',
));
output.writeln(generateConstructor(locale));
for (final String key in localeResources.keys) {
if (languageResources[key] == localeResources[key])
continue;
final Map<String, dynamic>? attributes = localeToResourceAttributes[canonicalLocale]![key] as Map<String, dynamic>?;
output.writeln(generateGetter(key, localeResources[key], attributes, languageLocale));
}
output.writeln('}');
}
}
final String scriptCodeMessage = scriptCodeCount == 0 ? '' : ' and $scriptCodeCount script${scriptCodeCount == 1 ? '' : 's'}';
if (countryCodeCount == 0) {
if (scriptCodeCount == 0)
supportedLocales.writeln('/// * `$languageName` - ${describeLocale(languageName)}');
else
supportedLocales.writeln('/// * `$languageName` - ${describeLocale(languageName)} (plus $scriptCodeCount script${scriptCodeCount == 1 ? '' : 's'})');
} else if (countryCodeCount == 1) {
supportedLocales.writeln('/// * `$languageName` - ${describeLocale(languageName)} (plus one country variation$scriptCodeMessage)');
} else {
supportedLocales.writeln('/// * `$languageName` - ${describeLocale(languageName)} (plus $countryCodeCount country variations$scriptCodeMessage)');
}
}
// Generate the factory function. Given a Locale it returns the corresponding
// base class implementation.
output.writeln('''
/// The set of supported languages, as language code strings.
///
/// The [$baseClass.delegate] can generate localizations for
/// any [Locale] with a language code from this set, regardless of the region.
/// Some regions have specific support (e.g. `de` covers all forms of German,
/// but there is support for `de-CH` specifically to override some of the
/// translations for Switzerland).
///
/// See also:
///
/// * [$factoryName], whose documentation describes these values.
final Set<String> $supportedLanguagesConstant = HashSet<String>.from(const <String>[
${languageCodes.map<String>((String value) => " '$value', // ${describeLocale(value)}").toList().join('\n')}
]);
/// Creates a [$baseClass] instance for the given `locale`.
///
/// All of the function's arguments except `locale` will be passed to the [
/// $baseClass] constructor. (The `localeName` argument of that
/// constructor is specified by the actual subclass constructor by this
/// function.)
///
/// The following locales are supported by this package:
///
/// {@template $supportedLanguagesDocMacro}
$supportedLocales/// {@endtemplate}
///
/// Generally speaking, this method is only intended to be used by
/// [$baseClass.delegate].
$factoryDeclaration
switch (locale.languageCode) {''');
for (final String language in languageToLocales.keys) {
// Only one instance of the language.
if (languageToLocales[language]!.length == 1) {
output.writeln('''
case '$language':
return $generatedClassPrefix${languageToLocales[language]![0].camelCase()}($factoryArguments);''');
} else if (!languageToScriptCodes.containsKey(language)) { // Does not distinguish between scripts. Switch on countryCode directly.
output.writeln('''
case '$language': {
switch (locale.countryCode) {''');
for (final LocaleInfo locale in languageToLocales[language]!) {
if (locale.originalString == language)
continue;
assert(locale.length > 1);
final String countryCode = locale.countryCode!;
output.writeln('''
case '$countryCode':
return $generatedClassPrefix${locale.camelCase()}($factoryArguments);''');
}
output.writeln('''
}
return $generatedClassPrefix${LocaleInfo.fromString(language).camelCase()}($factoryArguments);
}''');
} else { // Language has scriptCode, add additional switch logic.
bool hasCountryCode = false;
output.writeln('''
case '$language': {
switch (locale.scriptCode) {''');
for (final String scriptCode in languageToScriptCodes[language]!) {
final LocaleInfo scriptLocale = LocaleInfo.fromString('${language}_$scriptCode');
output.writeln('''
case '$scriptCode': {''');
if (languageAndScriptToCountryCodes.containsKey(scriptLocale)) {
output.writeln('''
switch (locale.countryCode) {''');
for (final LocaleInfo locale in languageToLocales[language]!) {
if (locale.countryCode == null)
continue;
else
hasCountryCode = true;
if (locale.originalString == language)
continue;
if (locale.scriptCode != scriptCode && locale.scriptCode != null)
continue;
final String countryCode = locale.countryCode!;
output.writeln('''
case '$countryCode':
return $generatedClassPrefix${locale.camelCase()}($factoryArguments);''');
}
}
// Return a fallback locale that matches scriptCode, but not countryCode.
//
// Explicitly defined scriptCode fallback:
if (languageToLocales[language]!.contains(scriptLocale)) {
if (languageAndScriptToCountryCodes.containsKey(scriptLocale)) {
output.writeln('''
}''');
}
output.writeln('''
return $generatedClassPrefix${scriptLocale.camelCase()}($factoryArguments);
}''');
} else {
// Not Explicitly defined, fallback to first locale with the same language and
// script:
for (final LocaleInfo locale in languageToLocales[language]!) {
if (locale.scriptCode != scriptCode)
continue;
if (languageAndScriptToCountryCodes.containsKey(scriptLocale)) {
output.writeln('''
}''');
}
output.writeln('''
return $generatedClassPrefix${scriptLocale.camelCase()}($factoryArguments);
}''');
break;
}
}
}
output.writeln('''
}''');
if (hasCountryCode) {
output.writeln('''
switch (locale.countryCode) {''');
for (final LocaleInfo locale in languageToLocales[language]!) {
if (locale.originalString == language)
continue;
assert(locale.length > 1);
if (locale.countryCode == null)
continue;
final String countryCode = locale.countryCode!;
output.writeln('''
case '$countryCode':
return $generatedClassPrefix${locale.camelCase()}($factoryArguments);''');
}
output.writeln('''
}''');
}
output.writeln('''
return $generatedClassPrefix${LocaleInfo.fromString(language).camelCase()}($factoryArguments);
}''');
}
}
output.writeln('''
}
assert(false, '$factoryName() called for unsupported locale "\$locale"');
return null;
}''');
return output.toString();
}
/// Returns the appropriate type for getters with the given attributes.
///
/// Typically "String", but some (e.g. "timeOfDayFormat") return enums.
///
/// Used by [generateGetter] below.
String generateType(Map<String, dynamic>? attributes) {
bool optional = false;
String type = 'String';
if (attributes != null) {
optional = attributes.containsKey('optional');
switch (attributes['x-flutter-type'] as String?) {
case 'icuShortTimePattern':
type = 'TimeOfDayFormat';
break;
case 'scriptCategory':
type = 'ScriptCategory';
break;
}
}
return type + (optional ? '?' : '');
}
/// Returns the appropriate name for getters with the given attributes.
///
/// Typically this is the key unmodified, but some have parameters, and
/// the GlobalMaterialLocalizations class does the substitution, and for
/// those we have to therefore provide an alternate name.
///
/// Used by [generateGetter] below.
String generateKey(String key, Map<String, dynamic>? attributes) {
if (attributes != null) {
if (attributes.containsKey('parameters'))
return '${key}Raw';
switch (attributes['x-flutter-type'] as String?) {
case 'icuShortTimePattern':
return '${key}Raw';
}
}
if (key == 'datePickerDateOrder')
return 'datePickerDateOrderString';
if (key == 'datePickerDateTimeOrder')
return 'datePickerDateTimeOrderString';
return key;
}
const Map<String, String> _icuTimeOfDayToEnum = <String, String>{
'HH:mm': 'TimeOfDayFormat.HH_colon_mm',
'HH.mm': 'TimeOfDayFormat.HH_dot_mm',
"HH 'h' mm": 'TimeOfDayFormat.frenchCanadian',
'HH:mm น.': 'TimeOfDayFormat.HH_colon_mm',
'H:mm': 'TimeOfDayFormat.H_colon_mm',
'h:mm a': 'TimeOfDayFormat.h_colon_mm_space_a',
'a h:mm': 'TimeOfDayFormat.a_space_h_colon_mm',
'ah:mm': 'TimeOfDayFormat.a_space_h_colon_mm',
};
const Map<String, String> _scriptCategoryToEnum = <String, String>{
'English-like': 'ScriptCategory.englishLike',
'dense': 'ScriptCategory.dense',
'tall': 'ScriptCategory.tall',
};
/// Returns the literal that describes the value returned by getters
/// with the given attributes.
///
/// This handles cases like the value being a literal `null`, an enum, and so
/// on. The default is to treat the value as a string and escape it and quote
/// it.
///
/// Used by [generateGetter] below.
String? generateValue(String? value, Map<String, dynamic>? attributes, LocaleInfo locale) {
if (value == null)
return null;
// cupertino_en.arb doesn't use x-flutter-type.
if (attributes != null) {
switch (attributes['x-flutter-type'] as String?) {
case 'icuShortTimePattern':
if (!_icuTimeOfDayToEnum.containsKey(value)) {
throw Exception(
'"$value" is not one of the ICU short time patterns supported '
'by the material library. Here is the list of supported '
'patterns:\n ${_icuTimeOfDayToEnum.keys.join('\n ')}'
);
}
return _icuTimeOfDayToEnum[value];
case 'scriptCategory':
if (!_scriptCategoryToEnum.containsKey(value)) {
throw Exception(
'"$value" is not one of the scriptCategory values supported '
'by the material library. Here is the list of supported '
'values:\n ${_scriptCategoryToEnum.keys.join('\n ')}'
);
}
return _scriptCategoryToEnum[value];
}
}
return generateEncodedString(locale.languageCode, value);
}
/// Combines [generateType], [generateKey], and [generateValue] to return
/// the source of getters for the GlobalMaterialLocalizations subclass.
/// The locale is the locale for which the getter is being generated.
String generateGetter(String key, String? value, Map<String, dynamic>? attributes, LocaleInfo locale) {
final String type = generateType(attributes);
key = generateKey(key, attributes);
final String? generatedValue = generateValue(value, attributes, locale);
return '''
@override
$type get $key => $generatedValue;''';
}
void main(List<String> rawArgs) {
checkCwdIsRepoRoot('gen_localizations');
final GeneratorOptions options = parseArgs(rawArgs);
// filenames are assumed to end in "prefix_lc.arb" or "prefix_lc_cc.arb", where prefix
// is the 2nd command line argument, lc is a language code and cc is the country
// code. In most cases both codes are just two characters.
final Directory directory = Directory(path.join('packages', 'flutter_localizations', 'lib', 'src', 'l10n'));
final RegExp materialFilenameRE = RegExp(r'material_(\w+)\.arb$');
final RegExp cupertinoFilenameRE = RegExp(r'cupertino_(\w+)\.arb$');
try {
validateEnglishLocalizations(File(path.join(directory.path, 'material_en.arb')));
validateEnglishLocalizations(File(path.join(directory.path, 'cupertino_en.arb')));
} on ValidationError catch (exception) {
exitWithError('$exception');
}
// Only rewrite material_kn.arb and cupertino_en.arb if overwriting the
// Material and Cupertino localizations files.
if (options.writeToFile) {
// Encodes the material_kn.arb file and the cupertino_en.arb files before
// generating localizations. This prevents a subset of Emacs users from
// crashing when opening up the Flutter source code.
// See https://github.com/flutter/flutter/issues/36704 for more context.
encodeKnArbFiles(directory);
}
precacheLanguageAndRegionTags();
// Maps of locales to resource key/value pairs for Material ARBs.
final Map<LocaleInfo, Map<String, String>> materialLocaleToResources = <LocaleInfo, Map<String, String>>{};
// Maps of locales to resource key/attributes pairs for Material ARBs..
// https://github.com/googlei18n/app-resource-bundle/wiki/ApplicationResourceBundleSpecification#resource-attributes
final Map<LocaleInfo, Map<String, dynamic>> materialLocaleToResourceAttributes = <LocaleInfo, Map<String, dynamic>>{};
// Maps of locales to resource key/value pairs for Cupertino ARBs.
final Map<LocaleInfo, Map<String, String>> cupertinoLocaleToResources = <LocaleInfo, Map<String, String>>{};
// Maps of locales to resource key/attributes pairs for Cupertino ARBs..
// https://github.com/googlei18n/app-resource-bundle/wiki/ApplicationResourceBundleSpecification#resource-attributes
final Map<LocaleInfo, Map<String, dynamic>> cupertinoLocaleToResourceAttributes = <LocaleInfo, Map<String, dynamic>>{};
loadMatchingArbsIntoBundleMaps(
directory: directory,
filenamePattern: materialFilenameRE,
localeToResources: materialLocaleToResources,
localeToResourceAttributes: materialLocaleToResourceAttributes,
);
loadMatchingArbsIntoBundleMaps(
directory: directory,
filenamePattern: cupertinoFilenameRE,
localeToResources: cupertinoLocaleToResources,
localeToResourceAttributes: cupertinoLocaleToResourceAttributes,
);
try {
validateLocalizations(materialLocaleToResources, materialLocaleToResourceAttributes);
validateLocalizations(cupertinoLocaleToResources, cupertinoLocaleToResourceAttributes);
} on ValidationError catch (exception) {
exitWithError('$exception');
}
final String? materialLocalizations = options.writeToFile || !options.cupertinoOnly
? generateArbBasedLocalizationSubclasses(
localeToResources: materialLocaleToResources,
localeToResourceAttributes: materialLocaleToResourceAttributes,
generatedClassPrefix: 'MaterialLocalization',
baseClass: 'GlobalMaterialLocalizations',
generateHeader: generateMaterialHeader,
generateConstructor: generateMaterialConstructor,
factoryName: materialFactoryName,
factoryDeclaration: materialFactoryDeclaration,
factoryArguments: materialFactoryArguments,
supportedLanguagesConstant: materialSupportedLanguagesConstant,
supportedLanguagesDocMacro: materialSupportedLanguagesDocMacro,
)
: null;
final String? cupertinoLocalizations = options.writeToFile || !options.materialOnly
? generateArbBasedLocalizationSubclasses(
localeToResources: cupertinoLocaleToResources,
localeToResourceAttributes: cupertinoLocaleToResourceAttributes,
generatedClassPrefix: 'CupertinoLocalization',
baseClass: 'GlobalCupertinoLocalizations',
generateHeader: generateCupertinoHeader,
generateConstructor: generateCupertinoConstructor,
factoryName: cupertinoFactoryName,
factoryDeclaration: cupertinoFactoryDeclaration,
factoryArguments: cupertinoFactoryArguments,
supportedLanguagesConstant: cupertinoSupportedLanguagesConstant,
supportedLanguagesDocMacro: cupertinoSupportedLanguagesDocMacro,
)
: null;
if (options.writeToFile) {
final File materialLocalizationsFile = File(path.join(directory.path, 'generated_material_localizations.dart'));
materialLocalizationsFile.writeAsStringSync(materialLocalizations!, flush: true);
final File cupertinoLocalizationsFile = File(path.join(directory.path, 'generated_cupertino_localizations.dart'));
cupertinoLocalizationsFile.writeAsStringSync(cupertinoLocalizations!, flush: true);
} else {
if (!options.cupertinoOnly) {
stdout.write(materialLocalizations);
}
if (!options.materialOnly) {
stdout.write(cupertinoLocalizations);
}
}
}