Initial super lame version

Author: vojtajina

.gitignore

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+node_modules
+packages
+pubspec.lock

Gruntfile.coffee

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+spawn = require('child_process').spawn
+
+DART_VM = process.env.DART_VM or '../dart-sdk/bin/dart'
+
+module.exports = (grunt) ->
+  grunt.initConfig
+    watch:
+      tests:
+        files: ['test/**/*.dart', 'lib/**/*.dart']
+        tasks: ['dart']
+    dart:
+      tests:
+        entry: 'test/main.dart'
+
+  grunt.registerMultiTask 'dart', 'run dart program', ->
+    spawn(DART_VM, [@data.entry], {stdio: 'inherit'}).on 'close', @async()
+
+  grunt.loadNpmTasks 'grunt-contrib-watch'

lib/di.dart

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+import 'mirrors.dart';
+import 'dart:async';
+
+class Injector {
+  // should be <Type,Type>
+  Map<String, String> providers = new Map<String, String>();
+  // should be <Type, dynamic>
+  Map<String, dynamic> instances = new Map<String, dynamic>();
+  
+  Injector([Map types]) {
+    if (types != null) {
+      // create <String,String> map, because Dart is stupid and makes us deal with strings rather than types
+      types.forEach((key, value) {
+        providers[key.toString()] = value.toString();
+      });  
+    }
+  }
+  
+  ClassMirror _getClassMirrorByTypeName (String typeName) {
+    // overriden provider
+    if (providers.containsKey(typeName)) {
+      typeName = providers[typeName];
+    }
+
+    for (var lib in currentMirrorSystem().libraries.values) {
+      if (lib.classes.containsKey(typeName)) {
+        return lib.classes[typeName];
+      }
+    }
+  }
+  
+  ClassMirror _getClassMirrorFromType(Type type) {
+    // terrible hack because we can't get a qualified name from a Type
+    // dartbug.com/8041
+    // dartbug.com/9395
+    return _getClassMirrorByTypeName(type.toString());
+  }
+  
+  
+  dynamic _getInstanceByTypeName(String typeName) {
+    if (instances.containsKey(typeName)) {
+      return instances[typeName];
+    }
+    
+    ClassMirror cm = _getClassMirrorByTypeName(typeName);
+    MethodMirror ctor = cm.constructors.values.first;
+    
+    resolveArgument(p) {
+      return _getInstanceByTypeName(p.type.simpleName);
+    }
+    
+    var positionalArgs = ctor.parameters.map(resolveArgument).toList();
+    var namedArgs = null;
+    var instance = deprecatedFutureValue(cm.newInstance(ctor.constructorName, positionalArgs, namedArgs));
+    
+    instances[typeName] = instance;
+
+    return instance;
+  }
+
+ 
+  // PUBLIC API
+  dynamic get(Type type) {
+    return _getInstanceByTypeName(type.toString()).reflectee;
+  }
+}

lib/mirrors.dart

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+// just to get rid of the warning
+library mirrors;
+
+export 'dart:mirrors';

package.json

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+{
+  "name": "dart-di",
+  "version": "0.0.0",
+  "description": "ERROR: No README.md file found!",
+  "main": "index.js",
+  "dependencies": {},
+  "devDependencies": {
+    "grunt": "~0.4",
+    "grunt-contrib-watch": "~0.3"
+  },
+  "scripts": {
+    "test": "grunt dart:test"
+  },
+  "repository": "",
+  "author": "Vojta Jina <[email protected]>",
+  "license": "MIT"
+}

pubspec.yaml

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+name: di
+description: A prototype of Dependency Injection framework. 
+version: 0.0.1
+author: "Vojta Jina <[email protected]>"
+homepage: https://github.com/dart-lang/dado
+
+dev_dependencies:
+  unittest: any

test/fixed-unittest.dart

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+library unittest;
+
+import 'package:unittest/unittest.dart';
+import '../lib/mirrors.dart';
+
+export 'package:unittest/unittest.dart';
+
+// fix the testing framework ;-)
+void it(String spec, TestFunction body) => test(spec, body);
+void xit(String spec, TestFunction body) {}
+void iit(String spec, TestFunction body) => solo_test(spec, body);
+
+Matcher toEqual(expected) => equals(expected);
+Matcher toBe(expected) => same(expected);
+Matcher instanceOf(Type t) => new IsInstanceOfTypeMatcher(t);
+
+
+// Welcome to Dart ;-)
+class IsInstanceOfTypeMatcher extends BaseMatcher {
+  Type t;
+  
+  IsInstanceOfTypeMatcher(Type t) {
+    this.t = t;
+  }
+  
+  bool matches(obj, MatchState matchState) {
+    // we should at least compare qualifiedName, but there's no way to get it from Type
+    return reflect(obj).type.simpleName == t.toString();
+  }
+  
+  Description describe(Description description) =>
+      description.add('an instance of ${t.toString()}');
+}

test/main.dart

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+import 'fixed-unittest.dart';
+import 'package:di/di.dart';
+
+// just some classes for testing
+class Abc {
+  String id = 'abc-id';
+  
+  void greet() {
+    print('HELLO');
+  }
+}
+
+class MockAbc implements Abc {
+  String id = 'mock-id';
+  
+  void greet() {
+    print('MOCK HELLO');
+  }
+}
+
+class Complex {
+  Abc value;
+  
+  Complex(Abc val) {
+    value = val;
+  }
+  
+  dynamic getValue() {
+    return value;
+  }
+}
+
+
+// pretend, you don't see this main method
+void main() {
+  
+it('should instantiate a type', () {
+  var injector = new Injector();
+  var instance = injector.get(Abc);
+  
+  expect(instance, instanceOf(Abc));
+  expect(instance.id, toEqual('abc-id'));
+});
+
+
+it('should resolve basic dependencies', () {
+  var injector = new Injector();
+  var instance = injector.get(Complex);
+
+  expect(instance, instanceOf(Complex));
+  expect(instance.getValue().id, toEqual('abc-id'));
+});
+
+
+it('should allow modules and overriding providers', () {
+  // module is just a Map<Type, Type>
+  var module = new Map<Type, Type>();
+  module[Abc] = MockAbc;
+  
+  // injector is immutable
+  // you can't load more modules once it's instantiated
+  // (you can create a child injector)
+  var injector = new Injector(module);
+  var instance = injector.get(Abc);
+  
+  expect(instance.id, toEqual('mock-id'));
+});
+
+
+it('should only create a single instance', () {
+  var injector = new Injector();
+  var first = injector.get(Abc);
+  var second = injector.get(Abc);
+  
+  expect(first, toBe(second));
+});
+  
+}