Delegating Parsing Function

Parser.scala

// Say we have something like this:
case class OperationsParser(root: Parser[Ast] = Parser.empty)(override implicit val qctx: Quotes) extends Parser.Clause[Ast] with ComparisonTechniques {
  def delegate: PartialFunction[Expr[_], Ast] = {
    case ...
  }
}

// Just do this:
case class OperationsParser(root: Parser[Ast] = Parser.empty)(override implicit val qctx: Quotes) extends Parser.Clause[Ast] with ComparisonTechniques {
  def delegate: PartialFunction[Expr[_], Ast] = {
    del.compose(PartialFunction.fromFunction(
      (expr: Expr[_]) => {
        // Now you can do things like print something when it comes in to this parser
        println(s"I am trying to parser this expression: ${io.getquill.util.Format.Expr(expr)}")
        expr
      }
    ))
  }
  
  def del: PartialFunction[Expr[_], Ast] = {
    case ...
  }
}