add TransformableSyntax (#231)

* add TransformableSyntax

smt-common/src/main/scala/org/bitlap/common/TransformableSyntax.scala

+package org.bitlap.common
+import org.bitlap.common.internal.TransformerMacro
+
+/** @author
+ *    梦境迷离
+ *  @version 1.0,2022/7/29
+ */
+trait TransformableSyntax[From <: Product, To <: Product] { self =>
+
+  val transformer: Transformer[From, To]
+
+  def Syntax: Transformable[From, To] = macro TransformerMacro.applyImpl[From, To]
+
+  implicit val _self: TransformableSyntax[From, To] = self
+
+}

smt-common/src/main/scala/org/bitlap/common/package.scala

@@ -72,4 +72,9 @@ package object common {
   implicit final class TransformerOps[F](private val from: F) extends AnyVal {
     final def transform[T](implicit transformer: Transformer[F, T]): T = transformer.transform(from)
   }
+
+  implicit final class TransformableSyntaxOps[F <: Product](private val from: F) extends AnyVal {
+    final def transformCaseClass[T <: Product](implicit transformableSyntax: TransformableSyntax[F, T]): T =
+      transformableSyntax.transformer.transform(from)
+  }
 }

smt-common/src/test/scala/org/bitlap/common/TransformableTest.scala

@@ -508,4 +508,53 @@ class TransformableTest extends AnyFlatSpec with Matchers {
       |    a.transform[A2](b1)
       |""".stripMargin shouldNot compile
   }
+
+  "TransformableTest extends TransformableOps" should "compile ok" in {
+    case class A1(a: Option[String], b: Boolean)
+
+    object A1 extends TransformableSyntax[A1, A2] {
+      override val transformer: Transformer[A1, A2] =
+        Syntax
+          .setName(_.a, _.b)
+          .setName(_.b, _.c)
+          .setType[Boolean, String](_.b, _.toString)
+          .setDefaultValue(_.b, None)
+          .instance
+    }
+
+    case class A2(
+      b: Option[String],
+      c: String,
+      e: Option[String] = Some("option")
+    )
+
+    val a = A1(Some("hello a"), false)
+    a.transformCaseClass[A2].toString shouldEqual "A2(Some(hello a),false,Some(option))"
+  }
+
+  "TransformableTest extends TransformableOps" should "ok" in {
+    case class A1(d: Option[String])
+
+    object A1 extends TransformableSyntax[A1, A2] {
+      override val transformer: Transformer[A1, A2] =
+        Syntax
+          .setDefaultValue(_.f, Option("1"))
+          .disableCollectionDefaultsToEmpty // use default value, not None
+          .disableOptionDefaultsToNone      // use default value, not Empty
+          .instance
+
+    }
+    case class A2(
+      d: Option[String],
+      e: Option[String] = Some("option"),
+      f: Option[String] = None,
+      h: List[String] = List("list"),
+      i: List[String] = List.empty
+    )
+
+    val a = A1(Some("hello a"))
+
+    a.transformCaseClass[A2].toString shouldEqual "A2(Some(hello a),Some(option),Some(1),List(list),List())"
+
+  }
 }