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zio.schema.Differ.scala Maven / Gradle / Ivy
package zio.schema
import java.math.{ BigInteger, MathContext }
import java.time.temporal.{ ChronoField, ChronoUnit }
import java.time.{
DayOfWeek,
Duration => JDuration,
Instant,
LocalDate,
LocalDateTime,
LocalTime,
Month => JMonth,
MonthDay,
OffsetDateTime,
OffsetTime,
Period,
Year,
YearMonth,
ZoneId,
ZoneOffset,
ZonedDateTime => JZonedDateTime
}
import java.util.{ Currency, UUID }
import scala.annotation.nowarn
import scala.collection.immutable.ListMap
import zio.prelude.NonEmptyMap
import zio.schema.diff.Edit
import zio.{ Chunk, ChunkBuilder }
trait Differ[A] { self =>
def apply(thisValue: A, thatValue: A): Patch[A]
/**
* A symbolic operator for [[zip]].
*/
def <*>[B](that: Differ[B]): Differ[(A, B)] = self.zip(that)
def zip[B](that: Differ[B]): Differ[(A, B)] = Differ.tuple(self, that)
def transform[B](f: B => A, g: A => B): Differ[B] =
(thisValue: B, thatValue: B) =>
Patch.Transform(self(f(thisValue), f(thatValue)), g.andThen(Right(_)), f.andThen(Right(_)))
def transformOrFail[B](f: B => Either[String, A], g: A => Either[String, B]): Differ[B] =
(thisValue: B, thatValue: B) =>
f(thisValue) -> f(thatValue) match {
case (Right(l), Right(r)) => Patch.Transform(self(l, r), g, f)
case _ => Patch.notComparable
}
def chunk: Differ[Chunk[A]] = Differ.LCSDiff[A]
def optional: Differ[Option[A]] = Differ.instancePartial {
case (Some(l), Some(r)) =>
Patch.Transform[A, Option[A]](
self(l, r),
(a: A) => Right(Some(a)),
(a: Option[A]) => a.map(Right(_)).getOrElse(Left("Patch cannot be applied to None value"))
)
case (Some(_), None) => Patch.Total(None)
case (None, Some(r)) => Patch.Total(Some(r))
case (None, None) => Patch.identical
}
}
object Differ {
import ProductDiffer._
private[schema] object LCSDiff {
def apply[A]: Differ[Chunk[A]] = new Differ[Chunk[A]] {
override def apply(original: Chunk[A], modified: Chunk[A]): Patch[Chunk[A]] = {
var varOriginal = original
var varModified = modified
var longestCommonSubstring: Chunk[A] = getLongestCommonSubsequence(original, modified)
val buffer: ChunkBuilder[Edit[A]] = ChunkBuilder.make()
while (longestCommonSubstring.size > 0) {
val headOfLongestCommonSubstring = longestCommonSubstring(0)
longestCommonSubstring = longestCommonSubstring.drop(1)
var headOfModified = varModified(0)
var loop = true
while (loop) {
headOfModified = varModified(0)
varModified = varModified.drop(1)
if (headOfModified != headOfLongestCommonSubstring)
buffer += Edit.Insert(headOfModified)
loop = varModified.size > 0 && headOfModified != headOfLongestCommonSubstring
}
var headOfOriginal = varOriginal(0)
loop = true
while (loop) {
headOfOriginal = varOriginal(0)
varOriginal = varOriginal.drop(1)
if (headOfOriginal != headOfLongestCommonSubstring)
buffer += Edit.Delete(headOfOriginal)
loop = varOriginal.size > 0 && headOfOriginal != headOfLongestCommonSubstring
}
buffer += Edit.Keep(headOfLongestCommonSubstring)
}
while (varModified.size > 0) {
val headOfModified = varModified(0)
varModified = varModified.drop(1)
buffer += Edit.Insert(headOfModified)
}
while (varOriginal.size > 0) {
val headOfOriginal = varOriginal(0)
varOriginal = varOriginal.drop(1)
buffer += Edit.Delete(headOfOriginal)
}
val edits = buffer.result()
if (isIdentical(edits)) Patch.identical else Patch.LCS(edits)
}
private def isIdentical(edits: Chunk[Edit[A]]): Boolean =
edits.isEmpty || edits.forall {
case Edit.Keep(_) => true
case _ => false
}
def getLongestCommonSubsequence(original: Chunk[A], modified: Chunk[A]): Chunk[A] =
if (original.length == 0 || modified.length == 0) Chunk.empty
else if (original == modified) original
else {
val myersMatrix: Array[Array[Int]] = initializeMyersMatrix(original, modified)
val longestCommonSubsequence: ChunkBuilder[A] = ChunkBuilder.make()
var originalPosition = original.length
var modifiedPosition = modified.length
var loop = true
while (loop) {
if (myersMatrix(originalPosition)(modifiedPosition) == myersMatrix(originalPosition - 1)(modifiedPosition)) {
originalPosition -= 1
} else if (myersMatrix(originalPosition)(modifiedPosition) == myersMatrix(originalPosition)(
modifiedPosition - 1
)) {
modifiedPosition -= 1
} else {
longestCommonSubsequence += original(originalPosition - 1)
originalPosition -= 1
modifiedPosition -= 1
}
loop = originalPosition > 0 && modifiedPosition > 0
}
longestCommonSubsequence.result().reverse
}
private def initializeMyersMatrix(original: Chunk[A], modified: Chunk[A]): Array[Array[Int]] = {
val originalLength = original.length
val modifiedLength = modified.length
val myersMatrix = Array.fill[Int](originalLength + 1, modifiedLength + 1)(0)
for (i <- 0 until originalLength) {
for (j <- 0 until modifiedLength) {
if (original(i) == modified(j)) {
myersMatrix(i + 1)(j + 1) = myersMatrix(i)(j) + 1
} else {
if (myersMatrix(i)(j + 1) >= myersMatrix(i + 1)(j)) {
myersMatrix(i + 1)(j + 1) = myersMatrix(i)(j + 1)
} else {
myersMatrix(i + 1)(j + 1) = myersMatrix(i + 1)(j)
}
}
}
}
myersMatrix
}
}
val string: Differ[String] = apply[Int].transform(
(s: String) => Chunk.fromIterable(s.toList.map(_.toInt)),
(as: Chunk[Int]) => new String(as.map(_.toChar).toArray)
)
def list[A]: Differ[List[A]] = apply[A].transform(
(as: List[A]) => Chunk.fromIterable(as),
(as: Chunk[A]) => as.toList
)
def map[K, V]: Differ[Map[K, V]] = apply[(K, V)].transform(
(m: Map[K, V]) => Chunk.fromIterable(m.toSeq),
(kvs: Chunk[(K, V)]) => kvs.toMap
)
def set[A]: Differ[Set[A]] = apply[A].transform(
(as: Set[A]) => Chunk.fromIterable(as),
(as: Chunk[A]) => as.toSet
)
}
//scalafmt: { maxColumn = 400, optIn.configStyleArguments = false }
def fromSchema[A](schema: Schema[A]): Differ[A] = schema match {
case Schema.Primitive(StandardType.UnitType, _) => unit
case Schema.Primitive(StandardType.BinaryType, _) => binary
case Schema.Primitive(StandardType.IntType, _) => numeric[Int]
case Schema.Primitive(StandardType.ByteType, _) => numeric[Byte]
case Schema.Primitive(StandardType.ShortType, _) => numeric[Short]
case Schema.Primitive(StandardType.DoubleType, _) => numeric[Double]
case Schema.Primitive(StandardType.FloatType, _) => numeric[Float]
case Schema.Primitive(StandardType.LongType, _) => numeric[Long]
case Schema.Primitive(StandardType.CharType, _) => numeric[Char]
case Schema.Primitive(StandardType.BoolType, _) => bool
case Schema.Primitive(StandardType.BigDecimalType, _) => bigDecimal
case Schema.Primitive(StandardType.BigIntegerType, _) => bigInt
case Schema.Primitive(StandardType.StringType, _) => string
case Schema.Primitive(StandardType.UUIDType, _) =>
string.transformOrFail[UUID](
(uuid: UUID) => Right(uuid.toString),
(s: String) =>
try {
Right(UUID.fromString(s))
} catch { case e: Throwable => Left(s"$s is not a valid UUID: ${e.getMessage}") }
)
case Schema.Primitive(StandardType.ZoneIdType, _) =>
string.transformOrFail[ZoneId](
(zoneId: ZoneId) => Right(zoneId.getId),
(s: String) =>
try {
Right(ZoneId.of(s))
} catch { case e: Throwable => Left(s"$s is not a valid ZoneId: ${e.getMessage}") }
)
case Schema.Primitive(StandardType.DayOfWeekType, _) => dayOfWeek
case Schema.Primitive(StandardType.PeriodType, _) => period
case Schema.Primitive(StandardType.MonthType, _) => month
case Schema.Primitive(StandardType.MonthDayType, _) => monthDay
case Schema.Primitive(StandardType.YearType, _) => year
case Schema.Primitive(StandardType.YearMonthType, _) => yearMonth
case Schema.Primitive(StandardType.LocalDateType, _) => localDate
case Schema.Primitive(StandardType.InstantType, _) => instant
case Schema.Primitive(StandardType.DurationType, _) => duration
case Schema.Primitive(StandardType.LocalTimeType, _) => localTime
case Schema.Primitive(StandardType.LocalDateTimeType, _) => localDateTime
case Schema.Primitive(StandardType.OffsetTimeType, _) => offsetTime
case Schema.Primitive(StandardType.OffsetDateTimeType, _) => offsetDateTime
case Schema.Primitive(StandardType.ZonedDateTimeType, _) => zonedDateTime
case Schema.Primitive(StandardType.ZoneOffsetType, _) => zoneOffset
case Schema.Primitive(StandardType.CurrencyType, _) =>
string.transformOrFail[Currency](
(currency: Currency) => Right(currency.toString),
(s: String) =>
try {
Right(Currency.getInstance(s))
} catch { case e: Throwable => Left(s"$s is not a valid Currency: ${e.getMessage}") }
)
case Schema.Tuple2(leftSchema, rightSchema, _) => fromSchema(leftSchema) <*> fromSchema(rightSchema)
case Schema.Optional(schema, _) => fromSchema(schema).optional
case Schema.Sequence(schema, g, f, _, _) => fromSchema(schema).chunk.transform(f, g)
case s @ Schema.NonEmptySequence(schema, _, f, _, _) => fromSchema(schema).chunk.transform(f, s.fromChunk)
case Schema.Set(s, _) => set(s)
case Schema.Map(k, v, _) => map(k, v)
case s @ Schema.NonEmptyMap(k: Schema[kt], v: Schema[vt], _) => map(k, v).transform[NonEmptyMap[kt, vt]](_.toMap.asInstanceOf[Map[kt, vt]], s.fromMap).asInstanceOf[Differ[A]]
case Schema.Either(leftSchema, rightSchema, _) => either(fromSchema(leftSchema), fromSchema(rightSchema))
case Schema.Fallback(leftSchema, rightSchema, _, _) => fallback(fromSchema(leftSchema), fromSchema(rightSchema))
case s @ Schema.Lazy(_) => fromSchema(s.schema)
case Schema.Transform(schema, g, f, _, _) => fromSchema(schema).transformOrFail(f, g)
case Schema.Fail(_, _) => fail
case s @ Schema.GenericRecord(_, _, _) => record(s)
case s: Schema.CaseClass0[A] => product0(s)
case s: Schema.CaseClass1[_, A] => product1(s)
case s: Schema.CaseClass2[_, _, A] => product2(s)
case s: Schema.CaseClass3[_, _, _, A] => product3(s)
case s: Schema.CaseClass4[_, _, _, _, A] => product4(s)
case s: Schema.CaseClass5[_, _, _, _, _, A] => product5(s)
case s: Schema.CaseClass6[_, _, _, _, _, _, A] => product6(s)
case s: Schema.CaseClass7[_, _, _, _, _, _, _, A] => product7(s)
case s: Schema.CaseClass8[_, _, _, _, _, _, _, _, A] => product8(s)
case s: Schema.CaseClass9[_, _, _, _, _, _, _, _, _, A] => product9(s)
case s: Schema.CaseClass10[_, _, _, _, _, _, _, _, _, _, A] => product10(s)
case s: Schema.CaseClass11[_, _, _, _, _, _, _, _, _, _, _, A] => product11(s)
case s: Schema.CaseClass12[_, _, _, _, _, _, _, _, _, _, _, _, A] => product12(s)
case s: Schema.CaseClass13[_, _, _, _, _, _, _, _, _, _, _, _, _, A] => product13(s)
case s: Schema.CaseClass14[_, _, _, _, _, _, _, _, _, _, _, _, _, _, A] => product14(s)
case s: Schema.CaseClass15[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, A] => product15(s)
case s: Schema.CaseClass16[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, A] => product16(s)
case s: Schema.CaseClass17[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, A] => product17(s)
case s: Schema.CaseClass18[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, A] => product18(s)
case s: Schema.CaseClass19[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, A] => product19(s)
case s: Schema.CaseClass20[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, A] => product20(s)
case s: Schema.CaseClass21[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, A] => product21(s)
case s: Schema.CaseClass22[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, A] =>
product22(s)
case Schema.Enum1(_, c, _) => enumN(c)
case Schema.Enum2(_, c1, c2, _) => enumN(c1, c2)
case Schema.Enum3(_, c1, c2, c3, _) => enumN(c1, c2, c3)
case Schema.Enum4(_, c1, c2, c3, c4, _) => enumN(c1, c2, c3, c4)
case Schema.Enum5(_, c1, c2, c3, c4, c5, _) => enumN(c1, c2, c3, c4, c5)
case Schema.Enum6(_, c1, c2, c3, c4, c5, c6, _) => enumN(c1, c2, c3, c4, c5, c6)
case Schema.Enum7(_, c1, c2, c3, c4, c5, c6, c7, _) => enumN(c1, c2, c3, c4, c5, c6, c7)
case Schema.Enum8(_, c1, c2, c3, c4, c5, c6, c7, c8, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8)
case Schema.Enum9(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9)
case Schema.Enum10(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10)
case Schema.Enum11(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11)
case Schema.Enum12(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12)
case Schema.Enum13(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13)
case Schema.Enum14(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14)
case Schema.Enum15(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15)
case Schema.Enum16(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16)
case Schema.Enum17(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17)
case Schema.Enum18(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18)
case Schema.Enum19(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19)
case Schema.Enum20(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20)
case Schema.Enum21(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21)
case Schema.Enum22(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21, c22, _) => enumN(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21, c22)
case Schema.EnumN(_, cs, _) => enumN(cs.toSeq: _*)
case Schema.Dynamic(_) => Differ.dynamicValue
}
//scalafmt: { maxColumn = 120, optIn.configStyleArguments = true }
def unit: Differ[Unit] = (_: Unit, _: Unit) => Patch.identical
def binary: Differ[Chunk[Byte]] = LCSDiff.apply[Byte]
//TODO We can probably actually diff DynamicValues properly
def dynamicValue: Differ[DynamicValue] = new Differ[DynamicValue] {
def apply(thisValue: DynamicValue, thatValue: DynamicValue): Patch[DynamicValue] = Patch.notComparable[DynamicValue]
}
def bool: Differ[Boolean] =
(thisBool: Boolean, thatBool: Boolean) =>
if (thisBool ^ thatBool) Patch.Bool(thisBool ^ thatBool) else Patch.identical
@nowarn def map[K, V](keySchema: Schema[K], valueSchema: Schema[V]): Differ[Map[K, V]] =
LCSDiff.map[K, V]
@nowarn def set[A](schema: Schema[A]): Differ[Set[A]] =
LCSDiff.set[A]
def numeric[A](implicit numeric: Numeric[A]): Differ[A] =
(thisValue: A, thatValue: A) =>
numeric.minus(thisValue, thatValue) match {
case distance if distance == numeric.zero => Patch.identical
case distance => Patch.Number(distance)
}
val period: Differ[Period] =
(thisPeriod: Period, thatPeriod: Period) =>
if (thisPeriod == thatPeriod)
Patch.identical
else
Patch.Temporal(
List(
(thisPeriod.getDays - thatPeriod.getDays).toLong,
(thisPeriod.getMonths - thatPeriod.getMonths).toLong,
(thisPeriod.getYears - thatPeriod.getYears).toLong
),
StandardType.PeriodType
)
val year: Differ[Year] =
(thisYear: Year, thatYear: Year) =>
if (thisYear == thatYear)
Patch.identical
else
Patch.Temporal(List[Long]((thisYear.getValue - thatYear.getValue).toLong), StandardType.YearType)
val yearMonth: Differ[YearMonth] =
(thisYearMonth: YearMonth, thatYearMonth: YearMonth) =>
if (thisYearMonth == thatYearMonth)
Patch.identical
else
Patch.Temporal(
List[Long](
thisYearMonth.getLong(ChronoField.PROLEPTIC_MONTH) - thatYearMonth.getLong(ChronoField.PROLEPTIC_MONTH)
),
StandardType.YearMonthType
)
def localDate: Differ[LocalDate] =
(thisLocalDate: LocalDate, thatLocalDate: LocalDate) =>
if (thisLocalDate == thatLocalDate)
Patch.identical
else
Patch.Temporal(List[Long](thisLocalDate.toEpochDay - thatLocalDate.toEpochDay), StandardType.LocalDateType)
def instant: Differ[Instant] =
(thisInstant: Instant, thatInstant: Instant) =>
if (thisInstant == thatInstant)
Patch.identical
else
Patch.Temporal(
List[Long](
thisInstant.getEpochSecond - thatInstant.getEpochSecond,
(thisInstant.getNano - thatInstant.getNano).toLong
),
StandardType.InstantType
)
def duration: Differ[JDuration] =
(thisDuration: JDuration, thatDuration: JDuration) =>
if (thisDuration == thatDuration)
Patch.identical
else
Patch.Temporal(
List[Long](
thisDuration.getSeconds - thatDuration.getSeconds,
(thisDuration.getNano - thatDuration.getNano).toLong
),
StandardType.DurationType
)
def localTime: Differ[LocalTime] =
(thisLocalTime: LocalTime, thatLocalTime: LocalTime) =>
if (thisLocalTime == thatLocalTime)
Patch.identical
else
Patch.Temporal(List[Long](thisLocalTime.toNanoOfDay - thatLocalTime.toNanoOfDay), StandardType.LocalTimeType)
def localDateTime: Differ[LocalDateTime] =
(thisLocalDateTime: LocalDateTime, thatLocalDateTime: LocalDateTime) =>
if (thisLocalDateTime == thatLocalDateTime)
Patch.identical
else
Patch.Temporal(
List[Long](
thisLocalDateTime.toLocalDate.toEpochDay - thatLocalDateTime.toLocalDate.toEpochDay,
thisLocalDateTime.toLocalTime.toNanoOfDay - thatLocalDateTime.toLocalTime.toNanoOfDay
),
StandardType.LocalDateTimeType
)
def offsetTime: Differ[OffsetTime] =
(thisOffsetTime: OffsetTime, thatOffsetTime: OffsetTime) =>
if (thisOffsetTime == thatOffsetTime)
Patch.identical
else
Patch.Temporal(
List[Long](
thisOffsetTime.toLocalTime.toNanoOfDay - thatOffsetTime.toLocalTime.toNanoOfDay,
(thisOffsetTime.getOffset.getTotalSeconds - thatOffsetTime.getOffset.getTotalSeconds).toLong
),
StandardType.OffsetTimeType
)
def offsetDateTime: Differ[OffsetDateTime] =
(thisOffsetDateTime: OffsetDateTime, thatOffsetDateTime: OffsetDateTime) =>
if (thisOffsetDateTime == thatOffsetDateTime)
Patch.identical
else
Patch.Temporal(
List[Long](
thisOffsetDateTime.toLocalDate.toEpochDay - thatOffsetDateTime.toLocalDate.toEpochDay,
thisOffsetDateTime.toLocalTime.toNanoOfDay - thatOffsetDateTime.toLocalTime.toNanoOfDay,
(thisOffsetDateTime.getOffset.getTotalSeconds - thatOffsetDateTime.getOffset.getTotalSeconds).toLong
),
StandardType.OffsetDateTimeType
)
def zonedDateTime: Differ[JZonedDateTime] =
(thisZonedDateTime: JZonedDateTime, thatZonedDateTime: JZonedDateTime) =>
if (thisZonedDateTime == thatZonedDateTime)
Patch.identical
else
Patch.ZonedDateTime(
localDateTime(
thisZonedDateTime.toLocalDateTime,
thatZonedDateTime.toLocalDateTime
),
string(thisZonedDateTime.getZone.getId, thatZonedDateTime.getZone.getId)
)
val zoneOffset: Differ[ZoneOffset] = (thisOffset: ZoneOffset, thatOffset: ZoneOffset) => {
if (thisOffset.getTotalSeconds == thatOffset.getTotalSeconds)
Patch.identical
else
Patch.Temporal(
List[Long]((thatOffset.getTotalSeconds - thisOffset.getTotalSeconds).toLong),
StandardType.ZoneOffsetType
)
}
val dayOfWeek: Differ[DayOfWeek] =
(thisDay: DayOfWeek, thatDay: DayOfWeek) =>
if (thisDay == thatDay)
Patch.identical
else
Patch.Temporal(List[Long]((thatDay.getValue - thisDay.getValue).toLong), StandardType.DayOfWeekType)
val month: Differ[JMonth] =
(thisMonth: JMonth, thatMonth: JMonth) =>
if (thisMonth == thatMonth)
Patch.identical
else
Patch.Temporal(List[Long]((thatMonth.getValue - thisMonth.getValue).toLong), StandardType.MonthType)
val monthDay: Differ[MonthDay] =
(thisMonthDay: MonthDay, thatMonthDay: MonthDay) =>
if (thisMonthDay == thatMonthDay)
Patch.identical
else
Patch.Temporal(
List[Long](
ChronoUnit.DAYS.between(thisMonthDay.atYear(2001), thatMonthDay.atYear(2001)),
ChronoUnit.DAYS.between(thisMonthDay.atYear(2000), thatMonthDay.atYear(2000))
),
StandardType.MonthDayType
)
val bigInt: Differ[BigInteger] =
(thisValue: BigInteger, thatValue: BigInteger) =>
thisValue.subtract(thatValue) match {
case BigInteger.ZERO => Patch.identical
case distance => Patch.BigInt(distance)
}
val bigDecimal: Differ[java.math.BigDecimal] =
(thisValue: java.math.BigDecimal, thatValue: java.math.BigDecimal) => {
val thatCtx = new MathContext(thatValue.precision())
thisValue.round(thatCtx).subtract(thatValue, MathContext.UNLIMITED) match {
case d if d.compareTo(java.math.BigDecimal.ZERO) == 0 => Patch.identical
case distance => Patch.BigDecimal(distance, thatValue.precision())
}
}
val currency: Differ[Currency] =
(thisValue: Currency, thatValue: Currency) =>
if (thisValue == thatValue)
Patch.identical
else
Patch.Currency(thatValue)
def tuple[A, B](left: Differ[A], right: Differ[B]): Differ[(A, B)] =
(thisValue: (A, B), thatValue: (A, B)) =>
(thisValue, thatValue) match {
case ((thisA, thisB), (thatA, thatB)) =>
left(thisA, thatA) <*> right(thisB, thatB)
}
def either[A, B](left: Differ[A], right: Differ[B]): Differ[Either[A, B]] =
instancePartial[Either[A, B]] {
case (Left(l), Left(r)) => Patch.EitherDiff(Left(left(l, r)))
case (Right(l), Right(r)) => Patch.EitherDiff(Right(right(l, r)))
}
def fallback[A, B](left: Differ[A], right: Differ[B]): Differ[Fallback[A, B]] =
instancePartial[Fallback[A, B]] {
case (Fallback.Left(l), Fallback.Left(r)) => Patch.Fallback(Fallback.Left(left(l, r)))
case (Fallback.Right(l), Fallback.Right(r)) => Patch.Fallback(Fallback.Right(right(l, r)))
case (Fallback.Both(l1, r1), Fallback.Both(l2, r2)) => Patch.Fallback(Fallback.Both(left(l1, l2), right(r1, r2)))
}
def identical[A]: Differ[A] = (_: A, _: A) => Patch.identical
def fail[A]: Differ[A] = (_: A, _: A) => Patch.notComparable
def record(schema: Schema.Record[ListMap[String, _]]): Differ[ListMap[String, _]] =
(thisValue: ListMap[String, _], thatValue: ListMap[String, _]) =>
if (!(conformsToStructure(thisValue, schema.fields) && conformsToStructure(thatValue, schema.fields)))
Patch.notComparable
else
thisValue.toList.zip(thatValue.toList).zipWithIndex.map {
case (((thisKey, thisValue), (_, thatValue)), fieldIndex) =>
thisKey -> fromSchema(schema.fields(fieldIndex).schema)
.asInstanceOf[Differ[Any]]
.apply(thisValue, thatValue)
} match {
case diffs if diffs.exists(!_._2.isComparable) =>
Patch.notComparable
case diffs =>
Patch.Record(ListMap.empty ++ diffs, schema).orIdentical
}
private def conformsToStructure[Z](map: ListMap[String, _], structure: Chunk[Schema.Field[Z, _]]): Boolean =
structure.foldRight(true) {
case (_, false) => false
case (field: Schema.Field[Z, a], _) => map.get(field.name).exists(_.isInstanceOf[a])
}
def enumN[Z](cases: Schema.Case[Z, _]*): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
cases
.foldRight[Option[Patch[Z]]](None) {
case (_, diff @ Some(_)) => diff
case (subtype: Schema.Case[Z, a], _) =>
subtype.deconstructOption(thisZ) -> (subtype.deconstructOption(thatZ)) match {
case (Some(thisA), Some(thatA)) =>
val subtypeDiffer: Differ[Z] =
fromSchema(subtype.schema).transform(
(z: Z) => subtype.deconstruct(z),
(a: a) => a.asInstanceOf[Z]
)
Some(subtypeDiffer(thisA.asInstanceOf[Z], thatA.asInstanceOf[Z]))
case _ => None
}
}
.getOrElse(Patch.notComparable)
def enumeration(structure: ListMap[String, Schema[_]]): Differ[(String, _)] =
instancePartial[(String, _)] {
case ((thisKey, thisValue), (thatKey, thatValue)) if thisKey == thatKey =>
structure
.get(thisKey)
.map(fromSchema(_).asInstanceOf[Differ[Any]](thisValue, thatValue))
.getOrElse(Patch.notComparable)
.asInstanceOf[Patch[(String, Any)]]
}
val string: Differ[String] = LCSDiff.string
def instancePartial[A](f: PartialFunction[(A, A), Patch[A]]): Differ[A] =
new Differ[A] {
override def apply(thisValue: A, thatValue: A): Patch[A] =
f.applyOrElse((thisValue, thatValue), (_: (A, A)) => Patch.notComparable)
}
}
//scalafmt: { maxColumn = 400, optIn.configStyleArguments = false }
private[schema] object ProductDiffer {
def product0[Z](schema: Schema.CaseClass0[Z]): Differ[Z] = {
val _ = schema
(_: Z, _: Z) => Patch.identical
}
def product1[A, Z](schema: Schema.CaseClass1[A, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record[Z](ListMap(fieldDiffer(schema.field)(thisZ, thatZ)), schema)
.orIdentical
def product2[A1, A2, Z](schema: Schema.CaseClass2[A1, A2, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(ListMap.empty ++ Chunk(fieldDiffer(schema.field1), fieldDiffer(schema.field2)).map(_.apply(thisZ, thatZ)), schema)
.orIdentical
def product3[A1, A2, A3, Z](schema: Schema.CaseClass3[A1, A2, A3, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(ListMap.empty ++ Chunk(fieldDiffer(schema.field1), fieldDiffer(schema.field2), fieldDiffer(schema.field3)).map(_.apply(thisZ, thatZ)), schema)
.orIdentical
def product4[A1, A2, A3, A4, Z](schema: Schema.CaseClass4[A1, A2, A3, A4, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(ListMap.empty ++ Chunk(fieldDiffer(schema.field1), fieldDiffer(schema.field2), fieldDiffer(schema.field3), fieldDiffer(schema.field4)).map(_.apply(thisZ, thatZ)), schema)
.orIdentical
def product5[A1, A2, A3, A4, A5, Z](schema: Schema.CaseClass5[A1, A2, A3, A4, A5, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(ListMap.empty ++ Chunk(fieldDiffer(schema.field1), fieldDiffer(schema.field2), fieldDiffer(schema.field3), fieldDiffer(schema.field4), fieldDiffer(schema.field5)).map(_.apply(thisZ, thatZ)), schema)
.orIdentical
def product6[A1, A2, A3, A4, A5, A6, Z](schema: Schema.CaseClass6[A1, A2, A3, A4, A5, A6, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(ListMap.empty ++ Chunk(fieldDiffer(schema.field1), fieldDiffer(schema.field2), fieldDiffer(schema.field3), fieldDiffer(schema.field4), fieldDiffer(schema.field5), fieldDiffer(schema.field6)).map(_.apply(thisZ, thatZ)), schema)
.orIdentical
def product7[A1, A2, A3, A4, A5, A6, A7, Z](schema: Schema.CaseClass7[A1, A2, A3, A4, A5, A6, A7, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(
ListMap.empty ++ Chunk(fieldDiffer(schema.field1), fieldDiffer(schema.field2), fieldDiffer(schema.field3), fieldDiffer(schema.field4), fieldDiffer(schema.field5), fieldDiffer(schema.field6), fieldDiffer(schema.field7))
.map(_.apply(thisZ, thatZ)),
schema
)
.orIdentical
def product8[A1, A2, A3, A4, A5, A6, A7, A8, Z](schema: Schema.CaseClass8[A1, A2, A3, A4, A5, A6, A7, A8, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(ListMap.empty ++ Chunk(fieldDiffer(schema.field1), fieldDiffer(schema.field2), fieldDiffer(schema.field3), fieldDiffer(schema.field4), fieldDiffer(schema.field5), fieldDiffer(schema.field6), fieldDiffer(schema.field7), fieldDiffer(schema.field8)).map(_.apply(thisZ, thatZ)), schema)
.orIdentical
def product9[A1, A2, A3, A4, A5, A6, A7, A8, A9, Z](schema: Schema.CaseClass9[A1, A2, A3, A4, A5, A6, A7, A8, A9, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(ListMap.empty ++ Chunk(fieldDiffer(schema.field1), fieldDiffer(schema.field2), fieldDiffer(schema.field3), fieldDiffer(schema.field4), fieldDiffer(schema.field5), fieldDiffer(schema.field6), fieldDiffer(schema.field7), fieldDiffer(schema.field8), fieldDiffer(schema.field9)).map(_.apply(thisZ, thatZ)), schema)
.orIdentical
def product10[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, Z](schema: Schema.CaseClass10[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(ListMap.empty ++ Chunk(fieldDiffer(schema.field1), fieldDiffer(schema.field2), fieldDiffer(schema.field3), fieldDiffer(schema.field4), fieldDiffer(schema.field5), fieldDiffer(schema.field6), fieldDiffer(schema.field7), fieldDiffer(schema.field8), fieldDiffer(schema.field9), fieldDiffer(schema.field10)).map(_.apply(thisZ, thatZ)), schema)
.orIdentical
def product11[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, Z](schema: Schema.CaseClass11[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(ListMap.empty ++ Chunk(fieldDiffer(schema.field1), fieldDiffer(schema.field2), fieldDiffer(schema.field3), fieldDiffer(schema.field4), fieldDiffer(schema.field5), fieldDiffer(schema.field6), fieldDiffer(schema.field7), fieldDiffer(schema.field8), fieldDiffer(schema.field9), fieldDiffer(schema.field10), fieldDiffer(schema.field11)).map(_.apply(thisZ, thatZ)), schema)
.orIdentical
def product12[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, Z](schema: Schema.CaseClass12[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(
ListMap.empty ++ Chunk(fieldDiffer(schema.field1), fieldDiffer(schema.field2), fieldDiffer(schema.field3), fieldDiffer(schema.field4), fieldDiffer(schema.field5), fieldDiffer(schema.field6), fieldDiffer(schema.field7), fieldDiffer(schema.field8), fieldDiffer(schema.field9), fieldDiffer(schema.field10), fieldDiffer(schema.field11), fieldDiffer(schema.field12)).map(_.apply(thisZ, thatZ)),
schema
)
.orIdentical
def product13[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, Z](schema: Schema.CaseClass13[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(
ListMap.empty ++ Chunk(fieldDiffer(schema.field1), fieldDiffer(schema.field2), fieldDiffer(schema.field3), fieldDiffer(schema.field4), fieldDiffer(schema.field5), fieldDiffer(schema.field6), fieldDiffer(schema.field7), fieldDiffer(schema.field8), fieldDiffer(schema.field9), fieldDiffer(schema.field10), fieldDiffer(schema.field11), fieldDiffer(schema.field12), fieldDiffer(schema.field13))
.map(_.apply(thisZ, thatZ)),
schema
)
.orIdentical
def product14[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, Z](schema: Schema.CaseClass14[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(
ListMap.empty ++ Chunk(
fieldDiffer(schema.field1),
fieldDiffer(schema.field2),
fieldDiffer(schema.field3),
fieldDiffer(schema.field4),
fieldDiffer(schema.field5),
fieldDiffer(schema.field6),
fieldDiffer(schema.field7),
fieldDiffer(schema.field8),
fieldDiffer(schema.field9),
fieldDiffer(schema.field10),
fieldDiffer(schema.field11),
fieldDiffer(schema.field12),
fieldDiffer(schema.field13),
fieldDiffer(schema.field14)
).map(_.apply(thisZ, thatZ)),
schema
)
.orIdentical
def product15[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, Z](schema: Schema.CaseClass15[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(
ListMap.empty ++ Chunk(
fieldDiffer(schema.field1),
fieldDiffer(schema.field2),
fieldDiffer(schema.field3),
fieldDiffer(schema.field4),
fieldDiffer(schema.field5),
fieldDiffer(schema.field6),
fieldDiffer(schema.field7),
fieldDiffer(schema.field8),
fieldDiffer(schema.field9),
fieldDiffer(schema.field10),
fieldDiffer(schema.field11),
fieldDiffer(schema.field12),
fieldDiffer(schema.field13),
fieldDiffer(schema.field14),
fieldDiffer(schema.field15)
).map(_.apply(thisZ, thatZ)),
schema
)
.orIdentical
def product16[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, Z](schema: Schema.CaseClass16[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(
ListMap.empty ++ Chunk(
fieldDiffer(schema.field1),
fieldDiffer(schema.field2),
fieldDiffer(schema.field3),
fieldDiffer(schema.field4),
fieldDiffer(schema.field5),
fieldDiffer(schema.field6),
fieldDiffer(schema.field7),
fieldDiffer(schema.field8),
fieldDiffer(schema.field9),
fieldDiffer(schema.field10),
fieldDiffer(schema.field11),
fieldDiffer(schema.field12),
fieldDiffer(schema.field13),
fieldDiffer(schema.field14),
fieldDiffer(schema.field15),
fieldDiffer(schema.field16)
).map(_.apply(thisZ, thatZ)),
schema
)
.orIdentical
def product17[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, Z](schema: Schema.CaseClass17[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(
ListMap.empty ++ Chunk(
fieldDiffer(schema.field1),
fieldDiffer(schema.field2),
fieldDiffer(schema.field3),
fieldDiffer(schema.field4),
fieldDiffer(schema.field5),
fieldDiffer(schema.field6),
fieldDiffer(schema.field7),
fieldDiffer(schema.field8),
fieldDiffer(schema.field9),
fieldDiffer(schema.field10),
fieldDiffer(schema.field11),
fieldDiffer(schema.field12),
fieldDiffer(schema.field13),
fieldDiffer(schema.field14),
fieldDiffer(schema.field15),
fieldDiffer(schema.field16),
fieldDiffer(schema.field17)
).map(_.apply(thisZ, thatZ)),
schema
)
.orIdentical
def product18[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, Z](schema: Schema.CaseClass18[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(
ListMap.empty ++ Chunk(
fieldDiffer(schema.field1),
fieldDiffer(schema.field2),
fieldDiffer(schema.field3),
fieldDiffer(schema.field4),
fieldDiffer(schema.field5),
fieldDiffer(schema.field6),
fieldDiffer(schema.field7),
fieldDiffer(schema.field8),
fieldDiffer(schema.field9),
fieldDiffer(schema.field10),
fieldDiffer(schema.field11),
fieldDiffer(schema.field12),
fieldDiffer(schema.field13),
fieldDiffer(schema.field14),
fieldDiffer(schema.field15),
fieldDiffer(schema.field16),
fieldDiffer(schema.field17),
fieldDiffer(schema.field18)
).map(_.apply(thisZ, thatZ)),
schema
)
.orIdentical
def product19[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, Z](schema: Schema.CaseClass19[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(
ListMap.empty ++ Chunk(
fieldDiffer(schema.field1),
fieldDiffer(schema.field2),
fieldDiffer(schema.field3),
fieldDiffer(schema.field4),
fieldDiffer(schema.field5),
fieldDiffer(schema.field6),
fieldDiffer(schema.field7),
fieldDiffer(schema.field8),
fieldDiffer(schema.field9),
fieldDiffer(schema.field10),
fieldDiffer(schema.field11),
fieldDiffer(schema.field12),
fieldDiffer(schema.field13),
fieldDiffer(schema.field14),
fieldDiffer(schema.field15),
fieldDiffer(schema.field16),
fieldDiffer(schema.field17),
fieldDiffer(schema.field18),
fieldDiffer(schema.field19)
).map(_.apply(thisZ, thatZ)),
schema
)
.orIdentical
def product20[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, Z](schema: Schema.CaseClass20[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(
ListMap.empty ++ Chunk(
fieldDiffer(schema.field1),
fieldDiffer(schema.field2),
fieldDiffer(schema.field3),
fieldDiffer(schema.field4),
fieldDiffer(schema.field5),
fieldDiffer(schema.field6),
fieldDiffer(schema.field7),
fieldDiffer(schema.field8),
fieldDiffer(schema.field9),
fieldDiffer(schema.field10),
fieldDiffer(schema.field11),
fieldDiffer(schema.field12),
fieldDiffer(schema.field13),
fieldDiffer(schema.field14),
fieldDiffer(schema.field15),
fieldDiffer(schema.field16),
fieldDiffer(schema.field17),
fieldDiffer(schema.field18),
fieldDiffer(schema.field19),
fieldDiffer(schema.field20)
).map(_.apply(thisZ, thatZ)),
schema
)
.orIdentical
def product21[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, Z](schema: Schema.CaseClass21[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(
ListMap.empty ++ Chunk(
fieldDiffer(schema.field1),
fieldDiffer(schema.field2),
fieldDiffer(schema.field3),
fieldDiffer(schema.field4),
fieldDiffer(schema.field5),
fieldDiffer(schema.field6),
fieldDiffer(schema.field7),
fieldDiffer(schema.field8),
fieldDiffer(schema.field9),
fieldDiffer(schema.field10),
fieldDiffer(schema.field11),
fieldDiffer(schema.field12),
fieldDiffer(schema.field13),
fieldDiffer(schema.field14),
fieldDiffer(schema.field15),
fieldDiffer(schema.field16),
fieldDiffer(schema.field17),
fieldDiffer(schema.field18),
fieldDiffer(schema.field19),
fieldDiffer(schema.field20),
fieldDiffer(schema.field21)
).map(_.apply(thisZ, thatZ)),
schema
)
.orIdentical
def product22[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, Z](schema: Schema.CaseClass22[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, Z]): Differ[Z] =
(thisZ: Z, thatZ: Z) =>
Patch
.Record(
ListMap.empty ++ Chunk(
fieldDiffer(schema.field1),
fieldDiffer(schema.field2),
fieldDiffer(schema.field3),
fieldDiffer(schema.field4),
fieldDiffer(schema.field5),
fieldDiffer(schema.field6),
fieldDiffer(schema.field7),
fieldDiffer(schema.field8),
fieldDiffer(schema.field9),
fieldDiffer(schema.field10),
fieldDiffer(schema.field11),
fieldDiffer(schema.field12),
fieldDiffer(schema.field13),
fieldDiffer(schema.field14),
fieldDiffer(schema.field15),
fieldDiffer(schema.field16),
fieldDiffer(schema.field17),
fieldDiffer(schema.field18),
fieldDiffer(schema.field19),
fieldDiffer(schema.field20),
fieldDiffer(schema.field21),
fieldDiffer(schema.field22)
).map(_.apply(thisZ, thatZ)),
schema
)
.orIdentical
private def fieldDiffer[A, Z](field: Schema.Field[Z, A]): (Z, Z) => (String, Patch[A]) =
(thisZ: Z, thatZ: Z) => field.name -> Differ.fromSchema(field.schema)(field.get(thisZ), field.get(thatZ))
}
