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package xyz.driver.restquery.http.parsers
import fastparse.all._
import fastparse.core.Parsed
import xyz.driver.restquery.domain.{Sorting, SortingOrder}
import xyz.driver.restquery.utils.Utils._
import scala.util.Try
object SortingParser {
private val sortingOrderParser: Parser[SortingOrder] = P("-".!.?).map {
case Some(_) => SortingOrder.Descending
case None => SortingOrder.Ascending
}
private def dimensionSortingParser(validDimensions: Seq[String]): Parser[Sorting.Dimension] = {
P(sortingOrderParser ~ StringIn(validDimensions: _*).!).map {
case (sortingOrder, field) =>
val prefixedFields = field.split("\\.", 2)
prefixedFields.size match {
case 1 => Sorting.Dimension(None, toSnakeCase(field), sortingOrder)
case 2 =>
Sorting.Dimension(Some(prefixedFields.head).map(toSnakeCase),
toSnakeCase(prefixedFields.last),
sortingOrder)
}
}
}
private def sequentialSortingParser(validDimensions: Seq[String]): Parser[Sorting.Sequential] = {
P(dimensionSortingParser(validDimensions).rep(min = 1, sep = ",") ~ End).map { dimensions =>
Sorting.Sequential(dimensions)
}
}
@deprecated("play-akka transition", "0")
def parse(validDimensions: Set[String], query: Map[String, Seq[String]]): Try[Sorting] =
parse(validDimensions, query.toSeq.flatMap {
case (key, values) =>
values.map(value => key -> value)
})
def parse(validDimensions: Set[String], query: Seq[(String, String)]): Try[Sorting] = Try {
query.toList.collect { case ("sort", value) => value } match {
case Nil => Sorting.Sequential(Seq.empty)
case rawSorting :: Nil =>
val parser = sequentialSortingParser(validDimensions.toSeq)
parser.parse(rawSorting) match {
case Parsed.Success(x, _) => x
case e: Parsed.Failure[_, _] =>
throw new ParseQueryArgException("sort" -> formatFailure(e))
}
case _ => throw new ParseQueryArgException("sort" -> "multiple sections are not allowed")
}
}
private def formatFailure(e: Parsed.Failure[_, _]): String = {
fastparse.core.ParseError.msg(e.extra.input, e.extra.traced.expected, e.index)
}
}
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