See original announcement on the Scala user list. For more information, see gallia-core documentation, in particular the Macros section.
Allows the following:
import aptus._
import gallia._
import gallia.macros._
// ======================================================================
// single object
assert( toHeadMacro (johnStatic).forceAObj == johnHead.forceAObj)
assert(fromHeadMacro[Person](johnHead) == johnStatic)
// ----------------------------------------------------------------------
assert( toAObjMacro (johnStatic) == johnDynamic)
assert(fromAObjMacro[Person](johnDynamic) == johnStatic)
// ----------------------------------------------------------------------
// data only
assert( toObjMacro (johnStatic) == johnDynamic.data)
assert(fromObjMacro[Person] (johnDynamic.data) == johnStatic)
// ----------------------------------------------------------------------
// schema
assert( toClsMacro (johnStatic) == johnDynamic.schema)
assert( toClsMacro [Person] == johnDynamic.schema)
// a "from" counterpart wouldn't make much sense
// ===========================================================================
// multiple objects
// ... same as above but with:
// - List[Person] instead of Person
// - AObjs/Objs instead of AObj/ObjAssumming the following metadata (schemas):
case class Person(name: String, age: Int, phones: Seq[String], addresses: Seq[Address])
case class Address(street: String, city: String, primary: Boolean)
case class PersonAlt(first: String, last: String, phones: Seq[String], addresses: Seq[Address])
// ---------------------------------------------------------------------------
private val PersonGalliaClass =
cls(
"name" .string,
"age" .int,
"phones" .strings,
"addresses" .clss(
"street" .string,
"city" .string,
"primary".boolean))and data:
private val johnStatic: Person =
Person(
name = "John Smith",
age = 32,
phones = Seq("123-456-7890", "098-765-4321"),
addresses = Seq(
Address("3 Orion Street", "Toronto", primary = true),
Address("2 Belle Blvd" , "Lyon", primary = false)))
// ---------------------------------------------------------------------------
private val johnDynamic: AObj =
aobj(PersonGalliaClass)(obj(
"name" -> "John Smith",
"age" -> 32,
"phones" -> Seq("123-456-7890", "098-765-4321"),
"addresses" -> Seq(
obj("street" -> "3 Orion Street", "city" -> "Toronto", "primary" -> true),
obj("street" -> "2 Belle Blvd" , "city" -> "Lyon", "primary" -> false))) )
// ---------------------------------------------------------------------------
val johnHead: HeadO = johnDynamic // for readability
Of course the point is actually to apply transformations, eg:
toHeadMacro(johnStatic)
.toUpperCase('name)
// ...
.printCompactJson() Preferably to other case classes after a long and convoluted journey:
toHeadMacro(johnStatic)
.fission(_.string("name")).as("first", "last").using(_.splitBy(" ", 2).force.tuple2)
// ...
.pipe(fromHeadMacro[PersonAlt](_))
.assert(_ == PersonAlt("John", "Smith", johnStatic.phones, johnStatic.addresses))- Error handling is minimal at this point, and error messages are not easy to interpret as a result
- Case classes are expected to be in scope for now , that is one must use
import my.pck.MyCC; toHeadMacro(MyCC(foo = "bar"))), nottoHeadMacro(my.pck.MyCC(foo = "bar")))(see corresponding task) - There is no proper check of schema compliance for the data (more generally relates to this task)
These will be addressed in the future.
You may contact the author at: 
