Support lambda inference for constructors. (#183)

Author: matanlurey

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 3.0.0-alpha+1
+
+* Also infer `Constructor.lambda` for `factory` constructors.
+
 ## 3.0.0-alpha
 
 * Using `equalsDart` no longer formats automatically with `dartfmt`.

lib/src/specs/constructor.dart

@@ -54,6 +54,7 @@ abstract class Constructor extends Object
   bool get factory;
 
   /// Whether this constructor is a simple lambda expression.
+  @nullable
   bool get lambda;
 
   /// Name of the constructor - optional.
@@ -100,7 +101,7 @@ abstract class ConstructorBuilder extends Object
   bool factory = false;
 
   /// Whether this constructor is a simple lambda expression.
-  bool lambda = false;
+  bool lambda;
 
   /// Name of the constructor - optional.
   String name;

lib/src/specs/constructor.g.dart

@@ -1,5 +1,5 @@
 name: code_builder
-version: 3.0.0-alpha
+version: 3.0.0-alpha+1
 description: A fluent API for generating Dart code
 author: Dart Team <[email protected]>
 homepage: https://github.com/dart-lang/code_builder

pubspec.yaml

@@ -264,6 +264,21 @@ void main() {
     );
   });
 
+  test('should create a class with an implicit factory lambda constructor', () {
+    expect(
+      new Class((b) => b
+        ..name = 'Foo'
+        ..constructors.add(new Constructor((b) => b
+          ..factory = true
+          ..body = refer('_Foo').newInstance([]).code))),
+      equalsDart(r'''
+        class Foo {
+          factory Foo() => new _Foo();
+        }
+      '''),
+    );
+  });
+
   test('should create a class with a constructor with a body', () {
     expect(
       new Class((b) => b