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| 1 /** | |
| 2 * Transformer which generates type factories for static injection. | |
| 3 * | |
| 4 * Types which are considered injectable can be annotated in the following ways: | |
| 5 * | |
| 6 * * Use the @inject annotation on a class from `package:inject/inject.dart` | |
| 7 * @inject | |
| 8 * class Engine {} | |
| 9 * | |
| 10 * or on the constructor: | |
| 11 * | |
| 12 * class Engine { | |
| 13 * @inject | |
| 14 * Engine(); | |
| 15 * } | |
| 16 * | |
| 17 * * Define a custom annotation in pubspec.yaml | |
| 18 * | |
| 19 * transformers: | |
| 20 * - di: | |
| 21 * injectable_annotations: | |
| 22 * - library_name.ClassName | |
| 23 * - library_name.constInstance | |
| 24 * | |
| 25 * Annotate constructors or classes with those annotations | |
| 26 * | |
| 27 * @ClassName() | |
| 28 * class Engine {} | |
| 29 * | |
| 30 * class Engine { | |
| 31 * @constInstance | |
| 32 * Engine(); | |
| 33 * } | |
| 34 * | |
| 35 * * Use package:di's Injectables | |
| 36 * | |
| 37 * @Injectables(const [Engine]) | |
| 38 * library my_lib; | |
| 39 * | |
| 40 * import 'package:di/annotations.dart'; | |
| 41 * | |
| 42 * class Engine {} | |
| 43 * | |
| 44 * * Specify injected types via pubspec.yaml | |
| 45 * | |
| 46 * transformers: | |
| 47 * - di: | |
| 48 * injected_types: | |
| 49 * - library_name.Engine | |
| 50 */ | |
| 51 library di.transformer; | |
| 52 | |
| 53 import 'dart:io'; | |
| 54 import 'package:barback/barback.dart'; | |
| 55 import 'package:code_transformers/resolver.dart'; | |
| 56 import 'package:di/transformer/injector_generator.dart'; | |
| 57 import 'package:di/transformer/options.dart'; | |
| 58 import 'package:path/path.dart' as path; | |
| 59 | |
| 60 | |
| 61 /** | |
| 62 * The transformer, which will extract all classes being dependency injected | |
| 63 * into a static injector. | |
| 64 */ | |
| 65 class DependencyInjectorTransformerGroup implements TransformerGroup { | |
| 66 final Iterable<Iterable> phases; | |
| 67 | |
| 68 DependencyInjectorTransformerGroup(TransformOptions options) | |
| 69 : phases = _createPhases(options); | |
| 70 | |
| 71 DependencyInjectorTransformerGroup.asPlugin(BarbackSettings settings) | |
| 72 : this(_parseSettings(settings.configuration)); | |
| 73 } | |
| 74 | |
| 75 TransformOptions _parseSettings(Map args) { | |
| 76 var annotations = _readStringListValue(args, 'injectable_annotations'); | |
| 77 var injectedTypes = _readStringListValue(args, 'injected_types'); | |
| 78 | |
| 79 var sdkDir = _readStringValue(args, 'dart_sdk', required: false); | |
| 80 if (sdkDir == null) { | |
| 81 // Assume the Pub executable is always coming from the SDK. | |
| 82 sdkDir = path.dirname(path.dirname(Platform.executable)); | |
| 83 } | |
| 84 | |
| 85 return new TransformOptions( | |
| 86 injectableAnnotations: annotations, | |
| 87 injectedTypes: injectedTypes, | |
| 88 sdkDirectory: sdkDir); | |
| 89 } | |
| 90 | |
| 91 _readStringValue(Map args, String name, {bool required: true}) { | |
| 92 var value = args[name]; | |
| 93 if (value == null) { | |
| 94 if (required) { | |
| 95 print('di transformer "$name" has no value.'); | |
| 96 } | |
| 97 return null; | |
| 98 } | |
| 99 if (value is! String) { | |
| 100 print('di transformer "$name" value is not a string.'); | |
| 101 return null; | |
| 102 } | |
| 103 return value; | |
| 104 } | |
| 105 | |
| 106 _readStringListValue(Map args, String name) { | |
| 107 var value = args[name]; | |
| 108 if (value == null) return []; | |
| 109 var results = []; | |
| 110 bool error; | |
| 111 if (value is List) { | |
| 112 results = value; | |
| 113 error = value.any((e) => e is! String); | |
| 114 } else if (value is String) { | |
| 115 results = [value]; | |
| 116 error = false; | |
| 117 } else { | |
| 118 error = true; | |
| 119 } | |
| 120 if (error) { | |
| 121 print('Invalid value for "$name" in di transformer .'); | |
| 122 } | |
| 123 return results; | |
| 124 } | |
| 125 | |
| 126 List<List<Transformer>> _createPhases(TransformOptions options) => | |
| 127 [[new InjectorGenerator(options, new Resolvers(options.sdkDirectory))]]; | |
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