From 0e098a93da94c251eb05d42bc7ef48394600508c Mon Sep 17 00:00:00 2001
From: Li Haoyi <haoyi.sg@gmail.com>
Date: Sun, 15 Sep 2019 12:36:39 +0800
Subject: Break circular dependency by splitting `RouteEndpointMetadata` into
 its own file

---
 cask/src/cask/main/RoutesEndpointMetadata.scala | 68 +++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 cask/src/cask/main/RoutesEndpointMetadata.scala

(limited to 'cask/src/cask/main/RoutesEndpointMetadata.scala')

diff --git a/cask/src/cask/main/RoutesEndpointMetadata.scala b/cask/src/cask/main/RoutesEndpointMetadata.scala
new file mode 100644
index 0000000..fa93a0c
--- /dev/null
+++ b/cask/src/cask/main/RoutesEndpointMetadata.scala
@@ -0,0 +1,68 @@
+package cask.main
+
+import cask.internal.Router.EntryPoint
+
+import language.experimental.macros
+import scala.reflect.macros.blackbox
+case class EndpointMetadata[T](decorators: Seq[RawDecorator],
+                               endpoint: Endpoint[_, _],
+                               entryPoint: EntryPoint[T, _])
+case class RoutesEndpointsMetadata[T](value: EndpointMetadata[T]*)
+object RoutesEndpointsMetadata{
+  implicit def initialize[T]: RoutesEndpointsMetadata[T] = macro initializeImpl[T]
+  implicit def initializeImpl[T: c.WeakTypeTag](c: blackbox.Context): c.Expr[RoutesEndpointsMetadata[T]] = {
+    import c.universe._
+    val router = new cask.internal.Router[c.type](c)
+
+    val routeParts = for{
+      m <- c.weakTypeOf[T].members
+      annotations = m.annotations.filter(_.tree.tpe <:< c.weakTypeOf[Decorator[_, _]])
+      if annotations.nonEmpty
+    } yield {
+      if(!(annotations.last.tree.tpe <:< weakTypeOf[Endpoint[_, _]])) c.abort(
+        annotations.head.tree.pos,
+        s"Last annotation applied to a function must be an instance of Endpoint, " +
+          s"not ${annotations.last.tree.tpe}"
+      )
+      val allEndpoints = annotations.filter(_.tree.tpe <:< weakTypeOf[Endpoint[_, _]])
+      if(allEndpoints.length > 1) c.abort(
+        annotations.last.tree.pos,
+        s"You can only apply one Endpoint annotation to a function, not " +
+          s"${allEndpoints.length} in ${allEndpoints.map(_.tree.tpe).mkString(", ")}"
+      )
+
+      val annotObjects =
+        for(annot <- annotations)
+          yield q"new ${annot.tree.tpe}(..${annot.tree.children.tail})"
+
+      val annotObjectSyms =
+        for(_ <- annotations.indices)
+          yield c.universe.TermName(c.freshName("annotObject"))
+
+      val route = router.extractMethod(
+        m.asInstanceOf[MethodSymbol],
+        weakTypeOf[T],
+        q"${annotObjectSyms.last}.convertToResultType",
+        tq"cask.Request",
+        annotObjectSyms.reverse.map(annotObjectSym => q"$annotObjectSym.getParamParser"),
+        annotObjectSyms.reverse.map(annotObjectSym => tq"$annotObjectSym.InputTypeAlias")
+      )
+
+      val declarations =
+        for((sym, obj) <- annotObjectSyms.zip(annotObjects))
+          yield q"val $sym = $obj"
+
+      val res = q"""{
+          ..$declarations
+          cask.main.EndpointMetadata(
+            Seq(..${annotObjectSyms.dropRight(1)}),
+            ${annotObjectSyms.last},
+            $route
+          )
+        }"""
+      res
+    }
+
+    c.Expr[RoutesEndpointsMetadata[T]](q"""cask.main.RoutesEndpointsMetadata(..$routeParts)""")
+  }
+}
\ No newline at end of file
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