289 lines
9.3 KiB
Dart
289 lines
9.3 KiB
Dart
part of angel_serialize_generator;
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class JsonModelGenerator extends GeneratorForAnnotation<Serializable> {
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const JsonModelGenerator();
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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, true);
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var lib = Library((b) {
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generateClass(ctx, b, annotation);
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});
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var buf = lib.accept(DartEmitter());
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return buf.toString();
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}
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/// Generate an extended model class.
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void generateClass(
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BuildContext ctx, LibraryBuilder file, ConstantReader annotation) {
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file.body.add(Class((clazz) {
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clazz
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..name = ctx.modelClassNameRecase.pascalCase
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..annotations.add(refer('generatedSerializable'));
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for (var ann in ctx.includeAnnotations) {
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clazz.annotations.add(convertObject(ann));
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}
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if (shouldBeConstant(ctx)) {
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clazz.implements.add(Reference(ctx.originalClassName));
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} else {
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clazz.extend = Reference(ctx.originalClassName);
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}
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//if (ctx.importsPackageMeta)
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// clazz.annotations.add(CodeExpression(Code('immutable')));
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for (var field in ctx.fields) {
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clazz.fields.add(Field((b) {
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b
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..name = field.name
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// ..modifier = FieldModifier.final$
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..annotations.add(CodeExpression(Code('override')))
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..type = convertTypeReference(field.type);
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// Fields should only be forced-final if the original field has no setter.
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if (field.setter == null && field is! ShimFieldImpl) {
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b.modifier = FieldModifier.final$;
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}
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for (var el in [field.getter, field]) {
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if (el?.documentationComment != null) {
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b.docs.addAll(el.documentationComment.split('\n'));
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}
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}
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}));
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}
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generateConstructor(ctx, clazz, file);
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generateCopyWithMethod(ctx, clazz, file);
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generateEqualsOperator(ctx, clazz, file);
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generateHashCode(ctx, clazz);
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generateToString(ctx, clazz);
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// Generate toJson() method if necessary
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var serializers = annotation.peek('serializers')?.listValue ?? [];
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if (serializers.any((o) => o.toIntValue() == Serializers.json)) {
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clazz.methods.add(Method((method) {
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method
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..name = 'toJson'
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..returns = Reference('Map<String, dynamic>')
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..body = Code('return ${clazz.name}Serializer.toMap(this);');
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}));
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}
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}));
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}
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bool shouldBeConstant(BuildContext ctx) {
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// Check if all fields are without a getter
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return !isAssignableToModel(ctx.clazz.type) &&
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ctx.clazz.fields.every((f) =>
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f.getter?.isAbstract != false && f.setter?.isAbstract != false);
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}
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/// Generate a constructor with named parameters.
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void generateConstructor(
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BuildContext ctx, ClassBuilder clazz, LibraryBuilder file) {
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clazz.constructors.add(Constructor((constructor) {
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// Add all `super` params
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constructor.constant = (ctx.clazz.unnamedConstructor?.isConst == true ||
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shouldBeConstant(ctx)) &&
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ctx.fields.every((f) {
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return f.setter == null && f is! ShimFieldImpl;
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});
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for (var param in ctx.constructorParameters) {
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constructor.requiredParameters.add(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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for (var field in ctx.fields) {
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if (!shouldBeConstant(ctx) && isListOrMapType(field.type)) {
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String typeName = const TypeChecker.fromRuntime(List)
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.isAssignableFromType(field.type)
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? 'List'
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: 'Map';
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var defaultValue = typeName == 'List' ? '[]' : '{}';
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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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}
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constructor.initializers.add(Code('''
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this.${field.name} =
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$typeName.unmodifiable(${field.name} ?? $defaultValue)'''));
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}
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}
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for (var field in ctx.fields) {
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constructor.optionalParameters.add(Parameter((b) {
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b
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..toThis = shouldBeConstant(ctx)
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..name = field.name
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..named = true;
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var existingDefault = ctx.defaults[field.name];
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if (existingDefault != null) {
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b.defaultTo = Code(dartObjectToString(existingDefault));
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}
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if (!isListOrMapType(field.type))
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b.toThis = true;
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else {
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b.type = convertTypeReference(field.type);
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}
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if (ctx.requiredFields.containsKey(field.name) &&
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b.defaultTo == null) {
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b.annotations.add(CodeExpression(Code('required')));
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}
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}));
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}
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if (ctx.constructorParameters.isNotEmpty) {
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if (!shouldBeConstant(ctx) ||
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ctx.clazz.unnamedConstructor?.isConst == true)
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constructor.initializers.add(Code(
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'super(${ctx.constructorParameters.map((p) => p.name).join(',')})'));
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}
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}));
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}
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/// Generate a `copyWith` method.
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void generateCopyWithMethod(
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BuildContext ctx, ClassBuilder clazz, LibraryBuilder file) {
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clazz.methods.add(Method((method) {
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method
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..name = 'copyWith'
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..returns = ctx.modelClassType;
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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(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 = StringBuffer('return ${ctx.modelClassName}(');
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int i = 0;
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for (var param in ctx.constructorParameters) {
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if (i++ > 0) buf.write(', ');
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buf.write(param.name);
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}
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// Add named parameters
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for (var field in ctx.fields) {
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method.optionalParameters.add(Parameter((b) {
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b
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..name = field.name
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..named = true
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..type = convertTypeReference(field.type);
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}));
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if (i++ > 0) buf.write(', ');
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buf.write('${field.name}: ${field.name} ?? this.${field.name}');
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}
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buf.write(');');
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method.body = Code(buf.toString());
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}));
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}
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static String generateEquality(DartType type, [bool nullable = false]) {
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if (type is InterfaceType) {
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if (const TypeChecker.fromRuntime(List).isAssignableFromType(type)) {
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if (type.typeParameters.length == 1) {
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var eq = generateEquality(type.typeArguments[0]);
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return 'ListEquality<${type.typeArguments[0].name}>($eq)';
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} else
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return 'ListEquality()';
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} else if (const TypeChecker.fromRuntime(Map)
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.isAssignableFromType(type)) {
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if (type.typeParameters.length == 2) {
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var keq = generateEquality(type.typeArguments[0]),
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veq = generateEquality(type.typeArguments[1]);
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return 'MapEquality<${type.typeArguments[0].name}, ${type.typeArguments[1].name}>(keys: $keq, values: $veq)';
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} else
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return 'MapEquality()';
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}
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return nullable ? null : 'DefaultEquality<${type.name}>()';
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} else {
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return 'DefaultEquality()';
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}
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}
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static String Function(String, String) generateComparator(DartType type) {
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if (type is! InterfaceType || type.name == 'dynamic')
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return (a, b) => '$a == $b';
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var eq = generateEquality(type, true);
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if (eq == null) return (a, b) => '$a == $b';
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return (a, b) => '$eq.equals($a, $b)';
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}
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void generateHashCode(BuildContext ctx, ClassBuilder clazz) {
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clazz
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..methods.add(Method((method) {
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method
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..name = 'hashCode'
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..type = MethodType.getter
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..returns = refer('int')
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..annotations.add(refer('override'))
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..body = refer('hashObjects')
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.call([literalList(ctx.fields.map((f) => refer(f.name)))])
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.returned
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.statement;
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}));
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}
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void generateToString(BuildContext ctx, ClassBuilder clazz) {
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clazz.methods.add(Method((b) {
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b
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..name = 'toString'
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..returns = refer('String')
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..annotations.add(refer('override'))
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..body = Block((b) {
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var buf = StringBuffer('\"${ctx.modelClassName}(');
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var i = 0;
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for (var field in ctx.fields) {
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if (i++ > 0) buf.write(', ');
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buf.write('${field.name}=\$${field.name}');
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}
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buf.write(')\"');
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b.addExpression(CodeExpression(Code(buf.toString())).returned);
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});
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}));
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}
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void generateEqualsOperator(
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BuildContext ctx, ClassBuilder clazz, LibraryBuilder file) {
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clazz.methods.add(Method((method) {
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method
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..name = 'operator =='
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..returns = Reference('bool')
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..requiredParameters.add(Parameter((b) => b.name = 'other'));
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var buf = ['other is ${ctx.originalClassName}'];
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buf.addAll(ctx.fields.map((f) {
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return generateComparator(f.type)('other.${f.name}', f.name);
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}));
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method.body = Code('return ${buf.join('&&')};');
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}));
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}
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}
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