Created
May 25, 2019 06:48
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select * from users order by name, age desc
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| abstract class Direction | |
| case class Asc(field: String*) extends Direction | |
| case class Desc(field: String*) extends Direction | |
| def order: Parser[Direction] = { | |
| ("order" ~> "by" ~> ident ~ ("asc" | "desc") ^^ { | |
| case f ~ "asc" => Asc(f) | |
| case f ~ "desc" => Desc(f) | |
| }) | ("order" ~> "by" ~> repsep(ident, ",") ~ ("asc" | "desc") ^^ { | |
| case f ~ "asc" => Asc(f: _*) | |
| case f ~ "desc" => Desc(f: _*) | |
| }) | |
| } | |
| //output: Desc("name", "age") |
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