[gen_l10n] Support plurals and selects inside string (#86167)

packages/flutter_tools/lib/src/localizations/gen_l10n.dart

@@ -229,15 +229,102 @@ String _generatePluralMethod(Message message, String translationForMessage) {
 
   final String comment = message.description ?? 'No description provided in @${message.resourceId}';
 
-  return pluralMethodTemplate
+  if (translationForMessage.startsWith('{') && translationForMessage.endsWith('}')) {
+    return pluralMethodTemplate
+      .replaceAll('@(comment)', comment)
+      .replaceAll('@(name)', message.resourceId)
+      .replaceAll('@(dateFormatting)', generateDateFormattingLogic(message))
+      .replaceAll('@(numberFormatting)', generateNumberFormattingLogic(message))
+      .replaceAll('@(parameters)', parameters.join(', '))
+      .replaceAll('@(count)', countPlaceholder.name)
+      .replaceAll('@(pluralLogicArgs)', pluralLogicArgs.join(',\n'))
+      .replaceAll('@(none)\n', '');
+  }
+
+  const String variable = 'pluralString';
+  final String string = _replaceWithVariable(translationForMessage, variable);
+  return pluralMethodTemplateInString
     .replaceAll('@(comment)', comment)
     .replaceAll('@(name)', message.resourceId)
-    .replaceAll('@(parameters)', parameters.join(', '))
     .replaceAll('@(dateFormatting)', generateDateFormattingLogic(message))
     .replaceAll('@(numberFormatting)', generateNumberFormattingLogic(message))
+    .replaceAll('@(parameters)', parameters.join(', '))
+    .replaceAll('@(variable)', variable)
     .replaceAll('@(count)', countPlaceholder.name)
     .replaceAll('@(pluralLogicArgs)', pluralLogicArgs.join(',\n'))
-    .replaceAll('@(none)\n', '');
+    .replaceAll('@(none)\n', '')
+    .replaceAll('@(string)', string);
+}
+
+String _replaceWithVariable(String translation, String variable) {
+  String prefix = generateString(translation.substring(0, translation.indexOf('{')));
+  prefix = prefix.substring(0, prefix.length - 1);
+  String suffix = generateString(translation.substring(translation.lastIndexOf('}') + 1));
+  suffix = suffix.substring(1);
+
+  // escape variable when the suffix can be combined with the variable
+  if (suffix.isNotEmpty && !suffix.startsWith(' ')) {
+    variable = '{$variable}';
+  }
+  return prefix + r'$' + variable + suffix;
+}
+
+String _generateSelectMethod(Message message, String translationForMessage) {
+  if (message.placeholders.isEmpty) {
+    throw L10nException(
+      'Unable to find placeholders for the select message: ${message.resourceId}.\n'
+      'Check to see if the select message is in the proper ICU syntax format '
+      'and ensure that placeholders are properly specified.'
+    );
+  }
+
+  final List<String> cases = <String>[];
+
+  final RegExpMatch? selectMatch =
+    LocalizationsGenerator._selectRE.firstMatch(translationForMessage);
+  String? choice;
+  if (selectMatch != null && selectMatch.groupCount == 2) {
+    choice = selectMatch.group(1);
+    final String pattern = selectMatch.group(2)!;
+    final RegExp patternRE = RegExp(r'\s*([\w\d]+)\s*\{(.*?)\}');
+    for (final RegExpMatch patternMatch in patternRE.allMatches(pattern)) {
+      if (patternMatch.groupCount == 2) {
+        final String value = patternMatch.group(2)!
+          .replaceAll("'", r"\'")
+          .replaceAll('"', r'\"');
+        cases.add(
+          "        '${patternMatch.group(1)}': '$value'",
+        );
+      }
+    }
+  }
+
+  final List<String> parameters = message.placeholders.map((Placeholder placeholder) {
+    final String placeholderType = placeholder.type ?? 'object';
+    return '$placeholderType ${placeholder.name}';
+  }).toList();
+
+  final String description = message.description ?? 'No description provided in @${message.resourceId}';
+
+  if (translationForMessage.startsWith('{') && translationForMessage.endsWith('}')) {
+    return selectMethodTemplate
+        .replaceAll('@(name)', message.resourceId)
+        .replaceAll('@(parameters)', parameters.join(', '))
+        .replaceAll('@(choice)', choice!)
+        .replaceAll('@(cases)', cases.join(',\n').trim())
+        .replaceAll('@(description)', description);
+  }
+
+  const String variable = 'selectString';
+  final String string = _replaceWithVariable(translationForMessage, variable);
+  return selectMethodTemplateInString
+      .replaceAll('@(name)', message.resourceId)
+      .replaceAll('@(parameters)', parameters.join(', '))
+      .replaceAll('@(variable)', variable)
+      .replaceAll('@(choice)', choice!)
+      .replaceAll('@(cases)', cases.join(',\n').trim())
+      .replaceAll('@(description)', description)
+      .replaceAll('@(string)', string);
 }
 
 bool _needsCurlyBracketStringInterpolation(String messageString, String placeholder) {
@@ -305,6 +392,10 @@ String _generateMethod(Message message, String translationForMessage) {
     return _generatePluralMethod(message, translationForMessage);
   }
 
+  if (message.isSelect) {
+    return _generateSelectMethod(message, translationForMessage);
+  }
+
   if (message.placeholdersRequireFormatting) {
     return formatMethodTemplate
       .replaceAll('@(name)', message.resourceId)
@@ -741,6 +832,8 @@ class LocalizationsGenerator {
   @visibleForTesting
   final bool areResourceAttributesRequired;
 
+  static final RegExp _selectRE = RegExp(r'\{([\w\s,]*),\s*select\s*,\s*([\w\d]+\s*\{.*\})+\s*\}');
+
   static bool _isNotReadable(FileStat fileStat) {
     final String rawStatString = fileStat.modeString();
     // Removes potential prepended permission bits, such as '(suid)' and '(guid)'.
@@ -1168,7 +1261,11 @@ class LocalizationsGenerator {
       .replaceAll('\n\n\n', '\n\n');
   }
 
-  bool _requiresIntlImport() => _allMessages.any((Message message) => message.isPlural || message.placeholdersRequireFormatting);
+  bool _requiresIntlImport() => _allMessages.any((Message message) {
+    return message.isPlural
+        || message.isSelect
+        || message.placeholdersRequireFormatting;
+  });
 
   void writeOutputFiles(Logger logger, { bool isFromYaml = false }) {
     // First, generate the string contents of all necessary files.

packages/flutter_tools/lib/src/localizations/gen_l10n_templates.dart

@@ -156,6 +156,46 @@ const String pluralMethodTemplate = '''
     );
   }''';
 
+const String pluralMethodTemplateInString = '''
+  @override
+  String @(name)(@(parameters)) {
+@(dateFormatting)
+@(numberFormatting)
+    final String @(variable) = intl.Intl.pluralLogic(
+      @(count),
+      locale: localeName,
+@(pluralLogicArgs),
+    );
+
+    return @(string);
+  }''';
+
+const String selectMethodTemplate = '''
+  @override
+  String @(name)(@(parameters)) {
+    return intl.Intl.select(
+      @(choice),
+      {
+        @(cases)
+      },
+      desc: '@(description)'
+    );
+  }''';
+
+const String selectMethodTemplateInString = '''
+  @override
+  String @(name)(@(parameters)) {
+    final String @(variable) = intl.Intl.select(
+      @(choice),
+      {
+        @(cases)
+      },
+      desc: '@(description)'
+    );
+
+    return @(string);
+  }''';
+
 const String classFileTemplate = '''
 @(header)
 

packages/flutter_tools/lib/src/localizations/gen_l10n_types.dart

@@ -273,17 +273,21 @@ class Message {
       value = _value(bundle, resourceId),
       description = _description(bundle, resourceId, isResourceAttributeRequired),
       placeholders = _placeholders(bundle, resourceId, isResourceAttributeRequired),
-      _pluralMatch = _pluralRE.firstMatch(_value(bundle, resourceId));
+      _pluralMatch = _pluralRE.firstMatch(_value(bundle, resourceId)),
+      _selectMatch = _selectRE.firstMatch(_value(bundle, resourceId));
 
   static final RegExp _pluralRE = RegExp(r'\s*\{([\w\s,]*),\s*plural\s*,');
+  static final RegExp _selectRE = RegExp(r'\s*\{([\w\s,]*),\s*select\s*,');
 
   final String resourceId;
   final String value;
   final String? description;
   final List<Placeholder> placeholders;
   final RegExpMatch? _pluralMatch;
+  final RegExpMatch? _selectMatch;
 
   bool get isPlural => _pluralMatch != null && _pluralMatch!.groupCount == 1;
+  bool get isSelect => _selectMatch != null && _selectMatch!.groupCount == 1;
 
   bool get placeholdersRequireFormatting => placeholders.any((Placeholder p) => p.requiresFormatting);
 
@@ -331,13 +335,21 @@ class Message {
       );
     }
 
-    final RegExpMatch? pluralRegExp = _pluralRE.firstMatch(_value(bundle, resourceId));
+    if (attributes == null) {
-    final bool isPlural = pluralRegExp != null && pluralRegExp.groupCount == 1;
+
-    if (attributes == null && isPlural) {
+      void _throwEmptyAttributes(final RegExp regExp, final String type) {
-      throw L10nException(
+        final RegExpMatch? match = regExp.firstMatch(_value(bundle, resourceId));
-        'Resource attribute "@$resourceId" was not found. Please '
+        final bool isMatch = match != null && match.groupCount == 1;
-        'ensure that plural resources have a corresponding @resource.'
+        if (isMatch) {
-      );
+          throw L10nException(
+            'Resource attribute "@$resourceId" was not found. Please '
+            'ensure that $type resources have a corresponding @resource.'
+          );
+        }
+      }
+
+      _throwEmptyAttributes(_pluralRE, 'plural');
+      _throwEmptyAttributes(_selectRE, 'select');
     }
 
     return attributes as Map<String, Object?>?;

packages/flutter_tools/test/integration.shard/gen_l10n_test.dart

@@ -118,40 +118,50 @@ void main() {
       "#l10n 63 (Flutter's amazing, times 2!)\n"
       '#l10n 64 (Flutter is "amazing"!)\n'
       '#l10n 65 (Flutter is "amazing", times 2!)\n'
-      '#l10n 66 (--- es ---)\n'
+      '#l10n 66 (16 wheel truck)\n'
-      '#l10n 67 (ES - Hello world)\n'
+      "#l10n 67 (Sedan's elegance)\n"
-      '#l10n 68 (ES - Hello _NEWLINE_ World)\n'
+      '#l10n 68 (Cabriolet has "acceleration")\n'
-      '#l10n 69 (ES - Hola \$ Mundo)\n'
+      '#l10n 69 (Oh, she found 1 item!)\n'
-      '#l10n 70 (ES - Hello Mundo)\n'
+      '#l10n 70 (Indeed, they like Flutter!)\n'
-      '#l10n 71 (ES - Hola Mundo)\n'
+      '#l10n 71 (--- es ---)\n'
-      '#l10n 72 (ES - Hello World on viernes, 1 de enero de 1960)\n'
+      '#l10n 72 (ES - Hello world)\n'
-      '#l10n 73 (ES - Hello world argument on 1/1/1960 at 0:00)\n'
+      '#l10n 73 (ES - Hello _NEWLINE_ World)\n'
-      '#l10n 74 (ES - Hello World from 1960 to 2020)\n'
+      '#l10n 74 (ES - Hola \$ Mundo)\n'
-      '#l10n 75 (ES - Hello for 123)\n'
+      '#l10n 75 (ES - Hello Mundo)\n'
-      '#l10n 76 (ES - Hello)\n'
+      '#l10n 76 (ES - Hola Mundo)\n'
-      '#l10n 77 (ES - Hello World)\n'
+      '#l10n 77 (ES - Hello World on viernes, 1 de enero de 1960)\n'
-      '#l10n 78 (ES - Hello two worlds)\n'
+      '#l10n 78 (ES - Hello world argument on 1/1/1960 at 0:00)\n'
-      '#l10n 79 (ES - Hello)\n'
+      '#l10n 79 (ES - Hello World from 1960 to 2020)\n'
-      '#l10n 80 (ES - Hello nuevo World)\n'
+      '#l10n 80 (ES - Hello for 123)\n'
-      '#l10n 81 (ES - Hello two nuevo worlds)\n'
+      '#l10n 81 (ES - Hello)\n'
-      '#l10n 82 (ES - Hello on viernes, 1 de enero de 1960)\n'
+      '#l10n 82 (ES - Hello World)\n'
-      '#l10n 83 (ES - Hello World, on viernes, 1 de enero de 1960)\n'
+      '#l10n 83 (ES - Hello two worlds)\n'
-      '#l10n 84 (ES - Hello two worlds, on viernes, 1 de enero de 1960)\n'
+      '#l10n 84 (ES - Hello)\n'
-      '#l10n 85 (ES - Hello other 0 worlds, with a total of 100 citizens)\n'
+      '#l10n 85 (ES - Hello nuevo World)\n'
-      '#l10n 86 (ES - Hello World of 101 citizens)\n'
+      '#l10n 86 (ES - Hello two nuevo worlds)\n'
-      '#l10n 87 (ES - Hello two worlds with 102 total citizens)\n'
+      '#l10n 87 (ES - Hello on viernes, 1 de enero de 1960)\n'
-      '#l10n 88 (ES - [Hola] -Mundo- #123#)\n'
+      '#l10n 88 (ES - Hello World, on viernes, 1 de enero de 1960)\n'
-      '#l10n 89 (ES - \$!)\n'
+      '#l10n 89 (ES - Hello two worlds, on viernes, 1 de enero de 1960)\n'
-      '#l10n 90 (ES - One \$)\n'
+      '#l10n 90 (ES - Hello other 0 worlds, with a total of 100 citizens)\n'
-      "#l10n 91 (ES - Flutter's amazing!)\n"
+      '#l10n 91 (ES - Hello World of 101 citizens)\n'
-      "#l10n 92 (ES - Flutter's amazing, times 2!)\n"
+      '#l10n 92 (ES - Hello two worlds with 102 total citizens)\n'
-      '#l10n 93 (ES - Flutter is "amazing"!)\n'
+      '#l10n 93 (ES - [Hola] -Mundo- #123#)\n'
-      '#l10n 94 (ES - Flutter is "amazing", times 2!)\n'
+      '#l10n 94 (ES - \$!)\n'
-      '#l10n 95 (--- es_419 ---)\n'
+      '#l10n 95 (ES - One \$)\n'
-      '#l10n 96 (ES 419 - Hello World)\n'
+      "#l10n 96 (ES - Flutter's amazing!)\n"
-      '#l10n 97 (ES 419 - Hello)\n'
+      "#l10n 97 (ES - Flutter's amazing, times 2!)\n"
-      '#l10n 98 (ES 419 - Hello World)\n'
+      '#l10n 98 (ES - Flutter is "amazing"!)\n'
-      '#l10n 99 (ES 419 - Hello two worlds)\n'
+      '#l10n 99 (ES - Flutter is "amazing", times 2!)\n'
+      '#l10n 100 (ES - 16 wheel truck)\n'
+      "#l10n 101 (ES - Sedan's elegance)\n"
+      '#l10n 102 (ES - Cabriolet has "acceleration")\n'
+      '#l10n 103 (ES - Oh, she found ES - 1 itemES - !)\n'
+      '#l10n 104 (ES - Indeed, ES - they like ES - Flutter!)\n'
+      '#l10n 105 (--- es_419 ---)\n'
+      '#l10n 106 (ES 419 - Hello World)\n'
+      '#l10n 107 (ES 419 - Hello)\n'
+      '#l10n 108 (ES 419 - Hello World)\n'
+      '#l10n 109 (ES 419 - Hello two worlds)\n'
       '#l10n END\n'
     );
   }

packages/flutter_tools/test/integration.shard/test_data/gen_l10n_project.dart

@@ -225,6 +225,11 @@ class Home extends StatelessWidget {
               '${localizations.singleQuotePlural(2)}',
               '${localizations.doubleQuote}',
               '${localizations.doubleQuotePlural(2)}',
+              "${localizations.vehicleSelect('truck')}",
+              "${localizations.singleQuoteSelect('sedan')}",
+              "${localizations.doubleQuoteSelect('cabriolet')}",
+              "${localizations.pluralInString(1)}",
+              "${localizations.selectInString('he')}",
             ]);
           },
         ),
@@ -266,6 +271,11 @@ class Home extends StatelessWidget {
               '${localizations.singleQuotePlural(2)}',
               '${localizations.doubleQuote}',
               '${localizations.doubleQuotePlural(2)}',
+              "${localizations.vehicleSelect('truck')}",
+              "${localizations.singleQuoteSelect('sedan')}",
+              "${localizations.doubleQuoteSelect('cabriolet')}",
+              "${localizations.pluralInString(1)}",
+              "${localizations.selectInString('he')}",
             ]);
           },
         ),
@@ -608,6 +618,46 @@ void main() {
     "placeholders": {
       "count": {}
     }
+  },
+
+  "vehicleSelect": "{vehicleType, select, sedan{Sedan} cabriolet{Solid roof cabriolet} truck{16 wheel truck} other{Other}}",
+  "@vehicleSelect": {
+    "description": "A select message.",
+    "placeholders": {
+      "vehicleType": {}
+    }
+  },
+
+  "singleQuoteSelect": "{vehicleType, select, sedan{Sedan's elegance} cabriolet{Cabriolet' acceleration} truck{truck's heavy duty} other{Other's mirrors!}}",
+  "@singleQuoteSelect": {
+    "description": "A select message with a single quote.",
+    "placeholders": {
+      "vehicleType": {}
+    }
+  },
+
+  "doubleQuoteSelect": "{vehicleType, select, sedan{Sedan has \"elegance\"} cabriolet{Cabriolet has \"acceleration\"} truck{truck is \"heavy duty\"} other{Other have \"mirrors\"!}}",
+  "@doubleQuoteSelect": {
+    "description": "A select message with double quote.",
+    "placeholders": {
+      "vehicleType": {}
+    }
+  },
+
+  "pluralInString": "Oh, she found {count, plural, =1 {1 item} other {all {count} items} }!",
+  "@pluralInString": {
+    "description": "A plural message with prefix and suffix strings.",
+    "placeholders": {
+      "count": {}
+    }
+  },
+
+  "selectInString": "Indeed, {gender, select, male {he likes} female {she likes} other {they like} } Flutter!",
+  "@selectInString": {
+    "description": "A select message with prefix and suffix strings.",
+    "placeholders": {
+      "gender": {}
+    }
   }
 }
 ''';
@@ -646,13 +696,18 @@ void main() {
   "helloWorldsOn": "{count,plural, =0{ES - Hello on {date}} =1{ES - Hello World, on {date}} =2{ES - Hello two worlds, on {date}} other{ES - Hello other {count} worlds, on {date}}}",
   "helloWorldPopulation": "{ES - count,plural, =1{ES - Hello World of {population} citizens} =2{ES - Hello two worlds with {population} total citizens} many{ES - Hello all {count} worlds, with a total of {population} citizens} other{ES - Hello other {count} worlds, with a total of {population} citizens}}",
   "helloWorldInterpolation": "ES - [{hello}] #{world}#",
-  "helloWorldsInterpolation": "ES - {count,plural, other {ES - [{hello}] -{world}- #{count}#}}",
+  "helloWorldsInterpolation": "{count,plural, other {ES - [{hello}] -{world}- #{count}#}}",
   "dollarSign": "ES - $!",
   "dollarSignPlural": "{count,plural, =1{ES - One $} other{ES - Many $}}",
   "singleQuote": "ES - Flutter's amazing!",
   "singleQuotePlural": "{count,plural, =1{ES - Flutter's amazing, times 1!} other{ES - Flutter's amazing, times {count}!}}",
   "doubleQuote": "ES - Flutter is \"amazing\"!",
-  "doubleQuotePlural": "{count,plural, =1{ES - Flutter is \"amazing\", times 1!} other{ES - Flutter is \"amazing\", times {count}!}}"
+  "doubleQuotePlural": "{count,plural, =1{ES - Flutter is \"amazing\", times 1!} other{ES - Flutter is \"amazing\", times {count}!}}",
+  "vehicleSelect": "{vehicleType, select, sedan{ES - Sedan} cabriolet{ES - Solid roof cabriolet} truck{ES - 16 wheel truck} other{ES - Other}}",
+  "singleQuoteSelect": "{vehicleType, select, sedan{ES - Sedan's elegance} cabriolet{ES - Cabriolet' acceleration} truck{ES - truck's heavy duty} other{ES - Other's mirrors!}}",
+  "doubleQuoteSelect": "{vehicleType, select, sedan{ES - Sedan has \"elegance\"} cabriolet{ES - Cabriolet has \"acceleration\"} truck{ES - truck is \"heavy duty\"} other{ES - Other have \"mirrors\"!}}",
+  "pluralInString": "ES - Oh, she found {count, plural, =1 {ES - 1 item} other {ES - all {count} items} }ES - !",
+  "selectInString": "ES - Indeed, {gender, select, male {ES - he likes} female {ES - she likes} other {ES - they like} } ES - Flutter!"
 }
 ''';