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pureconfig.scala
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pureconfig.scala
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/*
* Copyright 2022 Erik Erlandson
*
* 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 coulomb
import _root_.pureconfig.*
import coulomb.{infra => _, *}
import coulomb.rational.Rational
object pureconfig:
// it would be nice to handle polymorphic inputs
// https://github.com/pureconfig/pureconfig/issues/1472
given rationalReader: ConfigReader[Rational] =
ConfigReader.forProduct2("n", "d") { (n: BigInt, d: BigInt) =>
Rational(n, d)
}
given runtimeUnitReader: ConfigReader[RuntimeUnit] =
ConfigReader.fromCursor { cur =>
for {
objcur <- cur.asObjectCursor
typecur <- objcur.atKey("type")
typestr <- typecur.asString
u <- infra.readByType(typestr, objcur)
} yield u
}
object infra:
import _root_.pureconfig.error.CannotConvert
def readByType(typ: String, cur: ConfigObjectCursor): ConfigReader.Result[RuntimeUnit] =
typ match
case "const" => unitConstReader.from(cur)
case "type" => unitTypeReader.from(cur)
case "mul" => mulReader.from(cur)
case "div" => divReader.from(cur)
case "pow" => powReader.from(cur)
case t =>
cur.failed(CannotConvert(cur.objValue.toString, "RuntimeUnit", s"unknown type $t"))
val unitConstReader = ConfigReader.forProduct1("value")(RuntimeUnit.UnitConst(_))
val unitTypeReader = ConfigReader.forProduct1("path")(RuntimeUnit.UnitType(_))
val mulReader = ConfigReader.forProduct2("lhs", "rhs")(RuntimeUnit.Mul(_, _))
val divReader = ConfigReader.forProduct2("num", "den")(RuntimeUnit.Div(_, _))
val powReader = ConfigReader.forProduct2("b", "e")(RuntimeUnit.Pow(_, _))