generateClassAndDelegate method

String generateClassAndDelegate(List<LocalizationSheet> sheets, String className, bool includeFlutterDelegates)

Generate just the class + delegate bodies — no file header, no imports.

Used by the builder (inline mode) where the caller owns the header and writes sheet class bodies before calling this.

Implementation

String generateClassAndDelegate(
  List<LocalizationSheet> sheets,
  String className,
  bool includeFlutterDelegates,
) {
  final buffer = StringBuffer();

  final allLanguageCodes = <String>{};
  for (final sheet in sheets) {
    allLanguageCodes.addAll(sheet.languageCodes);
  }
  final sortedLanguages = allLanguageCodes.toList()..sort();

  buffer.writeln('class $className {');
  buffer.writeln('  final String languageCode;');
  buffer.writeln();

  buffer.writeln('  static const List<String> supportedLanguages = [');
  for (final lang in sortedLanguages) {
    buffer.writeln("    '$lang',");
  }
  buffer.writeln('  ];');
  buffer.writeln();

  for (final sheet in sheets) {
    final sheetClassName =
        '${StringUtils.sanitizeClassName(sheet.name)}Localizations';
    final propertyName = StringUtils.sanitizePropertyName(sheet.name);
    buffer.writeln('  late final $sheetClassName $propertyName;');
  }
  buffer.writeln();

  buffer.writeln('  $className(this.languageCode) {');
  for (final sheet in sheets) {
    final sheetClassName =
        '${StringUtils.sanitizeClassName(sheet.name)}Localizations';
    final propertyName = StringUtils.sanitizePropertyName(sheet.name);
    buffer.writeln('    $propertyName = $sheetClassName(languageCode);');
  }
  buffer.writeln('  }');
  buffer.writeln();

  if (includeFlutterDelegates) {
    final languageService = LanguageService();
    final addedGetters = <String>{};

    for (final lang in sortedLanguages.take(5)) {
      final capitalizedLang = languageService.getLanguageName(lang);
      final camelCaseLang = StringUtils.sanitizePropertyName(lang);
      buffer.writeln('  /// Get $capitalizedLang instance');
      buffer.writeln(
        "  static $className get $camelCaseLang => $className('$lang');",
      );
      addedGetters.add(camelCaseLang);
    }
    buffer.writeln();

    for (final lang in sortedLanguages.take(5)) {
      final fullName = languageService.getLanguageName(lang);
      final camelCaseFullName = StringUtils.sanitizePropertyName(fullName);
      final camelCaseLang = StringUtils.sanitizePropertyName(lang);
      if (!addedGetters.contains(camelCaseFullName) &&
          camelCaseFullName != camelCaseLang) {
        buffer.writeln(
          "  static $className get $camelCaseFullName => $className('$lang');",
        );
      }
    }
    buffer.writeln();

    buffer.writeln('  static $className of(BuildContext context) {');
    buffer.writeln('    final locale = Localizations.localeOf(context);');
    buffer.writeln('    return $className(locale.languageCode);');
    buffer.writeln('  }');
    buffer.writeln();

    buffer.writeln('  /// Get system language with fallback');
    buffer.writeln('  static String getSystemLanguage() {');
    buffer.writeln('    try {');
    buffer.writeln(
      '      // Try to get from Flutter${String.fromCharCode(39)}s PlatformDispatcher first',
    );
    buffer.writeln(
      '      final locales = PlatformDispatcher.instance.locales;',
    );
    buffer.writeln('      if (locales.isNotEmpty) {');
    buffer.writeln(
      '        final locale = locales.first.languageCode.toLowerCase();',
    );
    buffer.writeln('        if (supportedLanguages.contains(locale)) {');
    buffer.writeln('          return locale;');
    buffer.writeln('        }');
    buffer.writeln('      }');
    buffer.writeln('    } catch (e) {');
    buffer.writeln(
      '      // Fall back to other methods if PlatformDispatcher fails',
    );
    buffer.writeln('    }');
    buffer.writeln();
    buffer.writeln('    // Final fallback to English');
    buffer.writeln("    return 'en';");
    buffer.writeln('  }');
    buffer.writeln();

    buffer.writeln('  /// Get current localization based on system language');
    buffer.writeln(
      '  static $className get current => $className(getSystemLanguage());',
    );
    buffer.writeln();

    buffer.writeln('  /// Delegate for localizations');
    buffer.writeln(
      '  static const ${className}Delegate delegate = ${className}Delegate();',
    );
    buffer.writeln();
    buffer.writeln(
      '  /// All localization delegates including Flutter${String.fromCharCode(39)}s built-in delegates',
    );
    buffer.writeln(
      '  static const List<LocalizationsDelegate<dynamic>> delegates = [',
    );
    buffer.writeln('    delegate, // Custom localizations');
    buffer.writeln('    GlobalMaterialLocalizations.delegate,');
    buffer.writeln('    GlobalWidgetsLocalizations.delegate,');
    buffer.writeln('    GlobalCupertinoLocalizations.delegate,');
    buffer.writeln('  ];');
    buffer.writeln();
  }

  buffer.writeln('}');

  if (includeFlutterDelegates) {
    buffer.writeln();
    buffer.writeln(
      'class ${className}Delegate extends LocalizationsDelegate<$className> {',
    );
    buffer.writeln('  const ${className}Delegate();');
    buffer.writeln();
    buffer.writeln('  @override');
    buffer.writeln('  bool isSupported(Locale locale) {');
    buffer.writeln(
      '    return $className.supportedLanguages.contains(locale.languageCode);',
    );
    buffer.writeln('  }');
    buffer.writeln();
    buffer.writeln('  @override');
    buffer.writeln('  Future<$className> load(Locale locale) async {');
    buffer.writeln('    return $className(locale.languageCode);');
    buffer.writeln('  }');
    buffer.writeln();
    buffer.writeln('  @override');
    buffer.writeln('  bool shouldReload(${className}Delegate old) => false;');
    buffer.writeln('}');
  }

  return buffer.toString();
}