392 lines
13 KiB
Dart
392 lines
13 KiB
Dart
part of angel_serialize_generator;
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class SerializerGenerator extends GeneratorForAnnotation<Serializable> {
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final bool autoSnakeCaseNames;
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const SerializerGenerator({this.autoSnakeCaseNames: true});
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@override
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Future<String> generateForAnnotatedElement(
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Element element, ConstantReader annotation, BuildStep buildStep) async {
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if (element.kind != ElementKind.CLASS)
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throw 'Only classes can be annotated with a @Serializable() annotation.';
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var ctx = await buildContext(element as ClassElement, annotation, buildStep,
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await buildStep.resolver, autoSnakeCaseNames != false);
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var serializers = annotation.peek('serializers')?.listValue ?? [];
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if (serializers.isEmpty) return null;
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// Check if any serializer is recognized
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if (!serializers.any((s) => Serializers.all.contains(s.toIntValue()))) {
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return null;
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}
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var lib = new Library((b) {
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generateClass(serializers.map((s) => s.toIntValue()).toList(), ctx, b);
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generateFieldsClass(ctx, b);
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});
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var buf = lib.accept(new DartEmitter());
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return buf.toString();
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}
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/// Generate a serializer class.
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void generateClass(
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List<int> serializers, BuildContext ctx, LibraryBuilder file) {
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// Generate canonical codecs, etc.
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var pascal = ctx.modelClassNameRecase.pascalCase,
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camel = ctx.modelClassNameRecase.camelCase;
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if (ctx.constructorParameters.isEmpty) {
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file.body.add(new Code('''
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const ${pascal}Serializer ${camel}Serializer = const ${pascal}Serializer();
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class ${pascal}Encoder extends Converter<${pascal}, Map> {
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const ${pascal}Encoder();
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@override
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Map convert(${pascal} model) => ${pascal}Serializer.toMap(model);
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}
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class ${pascal}Decoder extends Converter<Map, ${pascal}> {
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const ${pascal}Decoder();
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@override
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${pascal} convert(Map map) => ${pascal}Serializer.fromMap(map);
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}
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'''));
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}
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file.body.add(new Class((clazz) {
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clazz..name = '${pascal}Serializer';
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if (ctx.constructorParameters.isEmpty) {
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clazz
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..extend = TypeReference((b) => b
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..symbol = 'Codec'
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..types.addAll([ctx.modelClassType, refer('Map')]));
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// Add constructor, Codec impl, etc.
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clazz.constructors.add(Constructor((b) => b..constant = true));
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clazz.methods.add(Method((b) => b
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..name = 'encoder'
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..type = MethodType.getter
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..annotations.add(refer('override'))
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..body = refer('${pascal}Encoder').constInstance([]).code));
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clazz.methods.add(Method((b) => b
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..name = 'decoder'
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..type = MethodType.getter
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..annotations.add(refer('override'))
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..body = refer('${pascal}Decoder').constInstance([]).code));
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} else {
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clazz.abstract = true;
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}
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if (serializers.contains(Serializers.map)) {
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generateFromMapMethod(clazz, ctx, file);
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}
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if (serializers.contains(Serializers.map) ||
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serializers.contains(Serializers.json)) {
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generateToMapMethod(clazz, ctx, file);
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}
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}));
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}
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void generateToMapMethod(
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ClassBuilder clazz, BuildContext ctx, LibraryBuilder file) {
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clazz.methods.add(new Method((method) {
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method
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..static = true
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..name = 'toMap'
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..returns = new Reference('Map<String, dynamic>')
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..requiredParameters.add(new Parameter((b) {
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b
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..name = 'model'
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..type = refer(ctx.originalClassName);
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}));
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var buf = new StringBuffer();
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ctx.requiredFields.forEach((key, msg) {
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if (ctx.excluded[key]?.canSerialize == false) return;
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buf.writeln('''
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if (model.$key == null) {
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throw new FormatException("$msg");
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}
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''');
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});
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buf.writeln('return {');
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int i = 0;
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// Add named parameters
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for (var field in ctx.fields) {
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var type = ctx.resolveSerializedFieldType(field.name);
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// Skip excluded fields
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if (ctx.excluded[field.name]?.canSerialize == false) continue;
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var alias = ctx.resolveFieldName(field.name);
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if (i++ > 0) buf.write(', ');
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String serializedRepresentation = 'model.${field.name}';
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String serializerToMap(ReCase rc, String value) {
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// if (rc.pascalCase == ctx.modelClassName) {
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// return '($value)?.toJson()';
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// }
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return '${rc.pascalCase}Serializer.toMap($value)';
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}
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if (ctx.fieldInfo[field.name]?.serializer != null) {
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var name = MirrorSystem.getName(ctx.fieldInfo[field.name].serializer);
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serializedRepresentation = '$name(model.${field.name})';
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}
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// Serialize dates
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else if (dateTimeTypeChecker.isAssignableFromType(type))
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serializedRepresentation = 'model.${field.name}?.toIso8601String()';
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// Serialize model classes via `XSerializer.toMap`
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else if (isModelClass(type)) {
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var rc = new ReCase(type.name);
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serializedRepresentation =
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'${serializerToMap(rc, 'model.${field.name}')}';
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} else if (type is InterfaceType) {
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if (isListOfModelType(type)) {
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var name = type.typeArguments[0].name;
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if (name.startsWith('_')) name = name.substring(1);
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var rc = new ReCase(name);
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var m = serializerToMap(rc, 'm');
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serializedRepresentation = '''
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model.${field.name}
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?.map((m) => $m)
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?.toList()''';
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} else if (isMapToModelType(type)) {
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var rc = new ReCase(type.typeArguments[1].name);
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serializedRepresentation =
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'''model.${field.name}.keys?.fold({}, (map, key) {
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return map..[key] =
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${serializerToMap(rc, 'model.${field.name}[key]')};
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})''';
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} else if (type.element.isEnum) {
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serializedRepresentation = '''
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model.${field.name} == null ?
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null
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: ${type.name}.values.indexOf(model.${field.name})
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''';
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} else if (const TypeChecker.fromRuntime(Uint8List)
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.isAssignableFromType(type)) {
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serializedRepresentation = '''
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model.${field.name} == null ?
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null
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: base64.encode(model.${field.name})
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''';
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}
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}
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buf.write("'$alias': $serializedRepresentation");
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}
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buf.write('};');
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method.body = new Block.of([
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new Code('if (model == null) { return null; }'),
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new Code(buf.toString()),
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]);
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}));
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}
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void generateFromMapMethod(
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ClassBuilder clazz, BuildContext ctx, LibraryBuilder file) {
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clazz.methods.add(new Method((method) {
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method
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..static = true
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..name = 'fromMap'
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..returns = ctx.modelClassType
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..requiredParameters.add(
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new Parameter((b) => b
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..name = 'map'
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..type = new Reference('Map')),
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);
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// Add all `super` params
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if (ctx.constructorParameters.isNotEmpty) {
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for (var param in ctx.constructorParameters) {
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method.requiredParameters.add(new Parameter((b) => b
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..name = param.name
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..type = convertTypeReference(param.type)));
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}
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}
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var buf = new StringBuffer();
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ctx.requiredFields.forEach((key, msg) {
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if (ctx.excluded[key]?.canDeserialize == false) return;
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var name = ctx.resolveFieldName(key);
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buf.writeln('''
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if (map['$name'] == null) {
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throw new FormatException("$msg");
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}
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''');
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});
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buf.writeln('return new ${ctx.modelClassName}(');
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int i = 0;
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for (var param in ctx.constructorParameters) {
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if (i++ > 0) buf.write(', ');
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buf.write(param.name);
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}
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for (var field in ctx.fields) {
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var type = ctx.resolveSerializedFieldType(field.name);
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if (ctx.excluded[field.name]?.canDeserialize == false) continue;
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var alias = ctx.resolveFieldName(field.name);
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if (i++ > 0) buf.write(', ');
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String deserializedRepresentation =
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"map['$alias'] as ${typeToString(type)}";
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var defaultValue = 'null';
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var existingDefault = ctx.defaults[field.name];
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if (existingDefault != null) {
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defaultValue = dartObjectToString(existingDefault);
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deserializedRepresentation =
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'$deserializedRepresentation ?? $defaultValue';
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}
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if (ctx.fieldInfo[field.name]?.deserializer != null) {
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var name =
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MirrorSystem.getName(ctx.fieldInfo[field.name].deserializer);
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deserializedRepresentation = "$name(map['$alias'])";
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} else if (dateTimeTypeChecker.isAssignableFromType(type))
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deserializedRepresentation = "map['$alias'] != null ? "
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"(map['$alias'] is DateTime ? (map['$alias'] as DateTime) : DateTime.parse(map['$alias'].toString()))"
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" : $defaultValue";
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// Serialize model classes via `XSerializer.toMap`
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else if (isModelClass(type)) {
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var rc = new ReCase(type.name);
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deserializedRepresentation = "map['$alias'] != null"
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" ? ${rc.pascalCase}Serializer.fromMap(map['$alias'] as Map)"
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" : $defaultValue";
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} else if (type is InterfaceType) {
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if (isListOfModelType(type)) {
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var rc = new ReCase(type.typeArguments[0].name);
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deserializedRepresentation = "map['$alias'] is Iterable"
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" ? new List.unmodifiable(((map['$alias'] as Iterable)"
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".where((x) => x is Map))"
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".cast<Map>()"
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".map(${rc.pascalCase}Serializer.fromMap))"
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" : $defaultValue";
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} else if (isMapToModelType(type)) {
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var rc = new ReCase(type.typeArguments[1].name);
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deserializedRepresentation = '''
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map['$alias'] is Map
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? new Map.unmodifiable((map['$alias'] as Map).keys.fold({}, (out, key) {
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return out..[key] = ${rc.pascalCase}Serializer
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.fromMap(((map['$alias'] as Map)[key]) as Map);
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}))
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: $defaultValue
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''';
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} else if (type.element.isEnum) {
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deserializedRepresentation = '''
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map['$alias'] is ${type.name}
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? (map['$alias'] as ${type.name})
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:
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(
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map['$alias'] is int
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? ${type.name}.values[map['$alias'] as int]
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: $defaultValue
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)
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''';
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} else if (const TypeChecker.fromRuntime(List)
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.isAssignableFromType(type) &&
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type.typeArguments.length == 1) {
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var arg = convertTypeReference(type.typeArguments[0])
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.accept(new DartEmitter());
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deserializedRepresentation = '''
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map['$alias'] is Iterable
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? (map['$alias'] as Iterable).cast<$arg>().toList()
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: $defaultValue
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''';
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} else if (const TypeChecker.fromRuntime(Map)
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.isAssignableFromType(type) &&
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type.typeArguments.length == 2) {
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var key = convertTypeReference(type.typeArguments[0])
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.accept(new DartEmitter());
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var value = convertTypeReference(type.typeArguments[1])
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.accept(new DartEmitter());
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deserializedRepresentation = '''
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map['$alias'] is Map
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? (map['$alias'] as Map).cast<$key, $value>()
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: $defaultValue
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''';
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} else if (const TypeChecker.fromRuntime(Uint8List)
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.isAssignableFromType(type)) {
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deserializedRepresentation = '''
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map['$alias'] is Uint8List
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? (map['$alias'] as Uint8List)
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:
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(
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map['$alias'] is Iterable<int>
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? new Uint8List.fromList((map['$alias'] as Iterable<int>).toList())
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:
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(
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map['$alias'] is String
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? new Uint8List.fromList(base64.decode(map['$alias'] as String))
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: $defaultValue
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)
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)
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''';
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}
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}
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buf.write('${field.name}: $deserializedRepresentation');
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}
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buf.write(');');
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method.body = new Code(buf.toString());
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}));
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}
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void generateFieldsClass(BuildContext ctx, LibraryBuilder file) {
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file.body.add(new Class((clazz) {
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clazz
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..abstract = true
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..name = '${ctx.modelClassNameRecase.pascalCase}Fields';
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clazz.fields.add(new Field((b) {
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b
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..static = true
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..modifier = FieldModifier.constant
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..type = new TypeReference((b) => b
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..symbol = 'List'
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..types.add(refer('String')))
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..name = 'allFields'
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..assignment = literalConstList(
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ctx.fields.map((f) => refer(f.name)).toList(),
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refer('String'))
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.code;
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}));
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for (var field in ctx.fields) {
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clazz.fields.add(new Field((b) {
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b
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..static = true
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..modifier = FieldModifier.constant
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..type = new Reference('String')
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..name = field.name
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..assignment = new Code("'${ctx.resolveFieldName(field.name)}'");
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}));
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}
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}));
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}
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}
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