io.sigs.seals.macros.UUIDMacro.scala Maven / Gradle / Ivy
/*
* Copyright 2017 Daniel Urban and contributors listed in AUTHORS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.sigs.seals
package macros
import java.util.UUID
import scala.reflect.macros.blackbox.Context
import cats.implicits._
object UUIDMacro extends StringInterpolatorHelper {
def impl(c: Context)(): c.Expr[UUID] = {
import c.universe._
val s: String = extractLiteral(c)
val u: UUID = try {
UUID.fromString(s)
} catch {
case ex: IllegalArgumentException =>
c.abort(c.enclosingPosition, show"not a valid UUID (${ex.getMessage})")
}
if (u.variant =!= 2) {
c.abort(c.enclosingPosition, "not an RFC-4122 UUID (variant is not 2)")
}
val msb: Long = u.getMostSignificantBits
val lsb: Long = u.getLeastSignificantBits
c.Expr[UUID](q"new _root_.java.util.UUID(${msb}, ${lsb})")
}
}