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Typesafe injector #79

merged 2 commits into from May 8, 2016
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28 changes: 26 additions & 2 deletions src/main/scala/com/greencatsoft/angularjs/core/Injector.scala
@@ -1,11 +1,35 @@
package com.greencatsoft.angularjs.core

import com.greencatsoft.angularjs.injectable
import com.greencatsoft.angularjs.{injectable, internal}
import com.greencatsoft.angularjs.internal.ServiceProxy

import scala.language.experimental.macros
import scala.reflect.macros.blackbox.Context
import scala.scalajs.js

trait Injector extends js.Object {
def get(name: String): js.Object = js.native
def get[A](name: String): A = js.native

/** Supports easy, type safe injection of types annotated with `@injectable`.
* See example:
* {{{
* implicit val injector = Angular.injector("ng", "myModule")
* val compile = Injector.get[Compile]
* val rootScope = Injector.get[RootScope]
* }}}
object Injector {
/** Gets an instance of the specified type from the provided injector.
* Fails at compile time, if the type isn't annotated with `@injectable`.
* @param injector the injector to retrieve the type from
* @tparam A the type to return an instance of
* @return instance of the specified type provided by the injector
def get[A](implicit injector: Injector): A = macro internal.Injector.get[A]
18 changes: 18 additions & 0 deletions src/main/scala/com/greencatsoft/angularjs/internal/Injector.scala
@@ -0,0 +1,18 @@
package com.greencatsoft.angularjs.internal

import com.greencatsoft.angularjs.core

import scala.reflect.macros.blackbox.Context

private[angularjs] object Injector {

def get[A](c: Context)(injector: c.Expr[core.Injector])(implicit tag: c.WeakTypeTag[A]): c.Expr[A] = {
import c.universe._

val name = ServiceProxy.identifierFromType(c)(tag.tpe) getOrElse {
c.abort(c.enclosingPosition, s"The specified type '${tag.tpe}' does not have @injectable annotation.")
val nameExpr = c.Expr[String](q"$name")
reify { injector.splice.get[A](nameExpr.splice) }