writeGeneralCodec method

@override void writeGeneralCodec(SwiftOptions generatorOptions, Root root, Indent indent, { required String dartPackageName, })

Writes the custom codec to indent.

Implementation

@override
void writeGeneralCodec(
  SwiftOptions generatorOptions,
  Root root,
  Indent indent, {
  required String dartPackageName,
}) {
  final String codecName = _getCodecName(generatorOptions);
  final String readerWriterName = '${codecName}ReaderWriter';
  final String readerName = '${codecName}Reader';
  final String writerName = '${codecName}Writer';

  final List<EnumeratedType> enumeratedTypes =
      getEnumeratedTypes(root).toList();

  void writeDecodeLogic(EnumeratedType customType) {
    indent.writeln('case ${customType.enumeration}:');
    indent.nest(1, () {
      if (customType.type == CustomTypes.customEnum) {
        indent.writeln(
            'let enumResultAsInt: Int? = nilOrValue(self.readValue() as? Int)');
        indent.writeScoped('if let enumResultAsInt = enumResultAsInt {', '}',
            () {
          indent.writeln(
              'return ${customType.name}(rawValue: enumResultAsInt)');
        });
        indent.writeln('return nil');
      } else {
        indent.writeln(
            'return ${customType.name}.fromList(self.readValue() as! [Any?])');
      }
    });
  }

  final EnumeratedType overflowClass = EnumeratedType(
      _overflowClassName, maximumCodecFieldKey, CustomTypes.customClass);

  if (root.requiresOverflowClass) {
    indent.newln();
    _writeCodecOverflowUtilities(
        generatorOptions, root, indent, enumeratedTypes,
        dartPackageName: dartPackageName);
  }

  indent.newln();
  // Generate Reader
  indent.write('private class $readerName: FlutterStandardReader ');
  indent.addScoped('{', '}', () {
    if (enumeratedTypes.isNotEmpty) {
      indent.write('override func readValue(ofType type: UInt8) -> Any? ');
      indent.addScoped('{', '}', () {
        indent.write('switch type ');
        indent.addScoped('{', '}', nestCount: 0, () {
          for (final EnumeratedType customType in enumeratedTypes) {
            if (customType.enumeration < maximumCodecFieldKey) {
              writeDecodeLogic(customType);
            }
          }
          if (root.requiresOverflowClass) {
            writeDecodeLogic(overflowClass);
          }
          indent.writeln('default:');
          indent.nest(1, () {
            indent.writeln('return super.readValue(ofType: type)');
          });
        });
      });
    }
  });

  // Generate Writer
  indent.newln();
  indent.write('private class $writerName: FlutterStandardWriter ');
  indent.addScoped('{', '}', () {
    if (enumeratedTypes.isNotEmpty) {
      indent.write('override func writeValue(_ value: Any) ');
      indent.addScoped('{', '}', () {
        indent.write('');
        for (final EnumeratedType customType in enumeratedTypes) {
          indent.add('if let value = value as? ${customType.name} ');
          indent.addScoped('{', '} else ', () {
            final String encodeString =
                customType.type == CustomTypes.customClass
                    ? 'toList()'
                    : 'rawValue';
            final String valueString =
                customType.enumeration < maximumCodecFieldKey
                    ? 'value.$encodeString'
                    : 'wrap.toList()';
            final int enumeration =
                customType.enumeration < maximumCodecFieldKey
                    ? customType.enumeration
                    : maximumCodecFieldKey;
            if (customType.enumeration >= maximumCodecFieldKey) {
              indent.writeln(
                  'let wrap = $_overflowClassName(type: ${customType.enumeration - maximumCodecFieldKey}, wrapped: value.$encodeString)');
            }
            indent.writeln('super.writeByte($enumeration)');
            indent.writeln('super.writeValue($valueString)');
          }, addTrailingNewline: false);
        }
        indent.addScoped('{', '}', () {
          indent.writeln('super.writeValue(value)');
        });
      });
    }
  });
  indent.newln();

  // Generate ReaderWriter
  indent
      .write('private class $readerWriterName: FlutterStandardReaderWriter ');
  indent.addScoped('{', '}', () {
    indent.write(
        'override func reader(with data: Data) -> FlutterStandardReader ');
    indent.addScoped('{', '}', () {
      indent.writeln('return $readerName(data: data)');
    });
    indent.newln();
    indent.write(
        'override func writer(with data: NSMutableData) -> FlutterStandardWriter ');
    indent.addScoped('{', '}', () {
      indent.writeln('return $writerName(data: data)');
    });
  });
  indent.newln();

  // Generate Codec
  indent.write(
      'class $codecName: FlutterStandardMessageCodec, @unchecked Sendable ');
  indent.addScoped('{', '}', () {
    indent.writeln(
        'static let shared = $codecName(readerWriter: $readerWriterName())');
  });
  indent.newln();
}