use opaque type to encoding dsl

src/main/scala/minisql/ast/FromExprs.scala

@@ -300,7 +300,8 @@ private def fromBlock(using
 given astFromExpr: FromExpr[Ast] = new FromExpr[Ast] {
 
   def unapply(e: Expr[Ast])(using Quotes): Option[Ast] = {
-    e match {
+    val t = extractTerm(e.toTerm)
+    t.asExpr match {
       case '{ $x: Query }           => x.value
       case '{ $x: ScalarValueLift } => x.value
       case '{ $x: Property }        => x.value
@@ -312,7 +313,10 @@ given astFromExpr: FromExpr[Ast] = new FromExpr[Ast] {
       case '{ $x: Action }          => x.value
       case '{ $x: If }              => x.value
       case '{ $x: Infix }           => x.value
-      case o                        => None
+      case o =>
+        import quotes.reflect.*
+        report.warning(s"Cannot get value from ${o.show}", o.asTerm.pos)
+        None
     }
   }
 }

src/main/scala/minisql/dsl.scala

@@ -1,69 +1,44 @@
 package minisql.dsl
 
 import minisql.*
-import minisql.parsing
+import minisql.parsing.*
 import minisql.ast.{Ast, Entity, Map, Property, Ident, given}
 import scala.quoted.*
 import scala.compiletime.*
 import scala.compiletime.ops.string.*
 import scala.collection.immutable.{Map => IMap}
 
-sealed trait Quoted {
-  def ast: Ast
-  def lifts: IMap[String, (Any, ParamEncoder[?])] = IMap.empty
-}
+opaque type Quoted <: Ast = Ast
 
-trait Query[E] extends Quoted
+opaque type Query[E] <: Quoted = Quoted
 
-case class EntityQuery[E](ast: Ast) extends Query[E]
+opaque type EntityQuery[E] <: Query[E] = Query[E]
 
 extension [E](inline e: EntityQuery[E]) {
   inline def map[E1](inline f: E => E1): EntityQuery[E1] = {
-    transform(e.ast)(f)(Map.apply)(EntityQuery.apply[E1])
+    transform(e)(f)(Map.apply)
   }
 }
 
-private inline def transform[D1 <: Quoted, D2 <: Quoted, A, B](inline ast: Ast)(
+private inline def transform[A, B](inline q1: Quoted)(
   inline f: A => B
-)(inline fast: (Ast, Ident, Ast) => Ast)(inline f2: Ast => D2): D2 = {
-  f2(fast(ast, f.param0, f.body))
+)(inline fast: (Ast, Ident, Ast) => Ast): Quoted = {
+  fast(q1, f.param0, f.body)
 }
 
-private given FromExpr[EntityQuery[?]] with {
-  def unapply(x: Expr[EntityQuery[?]])(using Quotes): Option[EntityQuery[?]] = {
-    x match {
-      case '{
-            val x: Ast = ${ Expr(ast) }
-            EntityQuery(x)
-          } =>
-        Some(EntityQuery(ast))
-      case '{ EntityQuery(${ Expr(ast) }) } =>
-        Some(EntityQuery(ast))
-      case _ =>
-        import quotes.reflect.*
-        println(s"cannot unlift ${x.show}: ${x.asTerm.getClass}")
-        None
-    }
-  }
-}
-private given FromExpr[Quoted] with {
-  def unapply(x: Expr[Quoted])(using Quotes): Option[Quoted] = {
-    import quotes.reflect.*
-    x match {
-      case '{ ($x: EntityQuery[?]) } => x.value
-    }
-  }
+inline def query[E](inline table: String): EntityQuery[E] =
+  Entity(table, Nil)
+
+inline def compile(inline x: Ast): Option[String] = ${
+  compileImpl('{ x })
 }
 
-inline def query[E](inline table: String) =
-  EntityQuery[E](Entity(table, Nil))
-
-inline def compile(inline x: Quoted): Option[String] = ${ compileImpl('x) }
-
-private def compileImpl(x: Expr[Quoted])(using Quotes): Expr[Option[String]] = {
+private def compileImpl(
+  x: Expr[Ast]
+)(using Quotes): Expr[Option[String]] = {
   import quotes.reflect.*
   x.value match {
-    case Some(xv) => '{ Some(${ Expr(xv.ast.toString()) }) }
+    case Some(xv) => '{ Some(${ Expr(xv.toString()) }) }
     case None     => '{ None }
   }
 }
@@ -78,3 +53,7 @@ extension [A1, A2, B](inline f1: (A1, A2) => B) {
   private inline def param1 = parsing.parseParamAt(f1, 1)
   private inline def body   = parsing.parseBody(f1)
 }
+
+case class Foo(id: Int)
+
+inline def queryFooId = query[Foo]("foo").map(_.id)