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package dotty.tools.dotc.util
import collection.mutable.ListBuffer
abstract class SimpleMap[K, +V >: Null <: AnyRef] extends (K => V) {
def size: Int
def apply(k: K): V
def remove(k: K): SimpleMap[K, V]
def updated[V1 >: V <: AnyRef](k: K, v: V1): SimpleMap[K, V1]
def contains(k: K): Boolean = apply(k) != null
def mapValues[V1 >: V <: AnyRef](f: V1 => V1): SimpleMap[K, V1]
def foreachKey(f: K => Unit): Unit
def map2[T](f: (K, V) => T): List[T] = {
val buf = new ListBuffer[T]
foreachKey { key =>
val k = key.asInstanceOf[K]
buf += f(k, this(k))
}
buf.toList
}
def keys: List[K] = map2((k, v) => k)
def toList: List[(K, V)] = map2((k, v) => (k, v))
override def toString = {
def assocToString(key: K, value: V) = s"$key -> $value"
map2(assocToString) mkString ("(", ", ", ")")
}
}
object SimpleMap {
private object myEmpty extends SimpleMap[Any, Null] {
def size = 0
def apply(k: Any) = null
def remove(k: Any) = this
def updated[V1 >: Null <: AnyRef](k: Any, v: V1) = new Map1(k, v)
def mapValues[V1 >: Null <: AnyRef](f: V1 => V1) = this
def foreachKey(f: Any => Unit) = ()
}
def Empty[K] = myEmpty.asInstanceOf[SimpleMap[K, Null]]
class Map1[K, +V >: Null <: AnyRef] (k1: K, v1: V) extends SimpleMap[K, V] {
def size = 1
def apply(k: K) =
if (k == k1) v1
else null
def remove(k: K) =
if (k == k1) Empty.asInstanceOf[SimpleMap[K, V]]
else this
def updated[V1 >: V <: AnyRef](k: K, v: V1) =
if (k == k1) new Map1(k, v)
else new Map2(k1, v1, k, v)
def mapValues[V1 >: V <: AnyRef](f: V1 => V1) = {
val w1 = f(v1)
if (v1 eq w1) this else new Map1(k1, w1)
}
def foreachKey(f: K => Unit) = f(k1)
}
class Map2[K, +V >: Null <: AnyRef] (k1: K, v1: V, k2: K, v2: V) extends SimpleMap[K, V] {
def size = 2
def apply(k: K) =
if (k == k1) v1
else if (k == k2) v2
else null
def remove(k: K) =
if (k == k1) new Map1(k2, v2)
else if (k == k2) new Map1(k1, v1)
else this
def updated[V1 >: V <: AnyRef](k: K, v: V1) =
if (k == k1) new Map2(k, v, k2, v2)
else if (k == k2) new Map2(k1, v1, k, v)
else new Map3(k1, v1, k2, v2, k, v)
def mapValues[V1 >: V <: AnyRef](f: V1 => V1) = {
val w1 = f(v1); val w2 = f(v2)
if ((v1 eq w1) && (v2 eq w2)) this
else new Map2(k1, w1, k2, w2)
}
def foreachKey(f: K => Unit) = { f(k1); f(k2) }
}
class Map3[K, +V >: Null <: AnyRef] (k1: K, v1: V, k2: K, v2: V, k3: K, v3: V) extends SimpleMap[K, V] {
def size = 3
def apply(k: K) =
if (k == k1) v1
else if (k == k2) v2
else if (k == k3) v3
else null
def remove(k: K) =
if (k == k1) new Map2(k2, v2, k3, v3)
else if (k == k2) new Map2(k1, v1, k3, v3)
else if (k == k3) new Map2(k1, v1, k2, v2)
else this
def updated[V1 >: V <: AnyRef](k: K, v: V1) =
if (k == k1) new Map3(k, v, k2, v2, k3, v3)
else if (k == k2) new Map3(k1, v1, k, v, k3, v3)
else if (k == k3) new Map3(k1, v1, k2, v2, k, v)
else new Map4(k1, v1, k2, v2, k3, v3, k, v)
def mapValues[V1 >: V <: AnyRef](f: V1 => V1) = {
val w1 = f(v1); val w2 = f(v2); val w3 = f(v3)
if ((v1 eq w1) && (v2 eq w2) && (v3 eq w3)) this
else new Map3(k1, w1, k2, w2, k3, w3)
}
def foreachKey(f: K => Unit) = { f(k1); f(k2); f(k3) }
}
class Map4[K, +V >: Null <: AnyRef] (k1: K, v1: V, k2: K, v2: V, k3: K, v3: V, k4: K, v4: V) extends SimpleMap[K, V] {
def size = 4
def apply(k: K) =
if (k == k1) v1
else if (k == k2) v2
else if (k == k3) v3
else if (k == k4) v4
else null
def remove(k: K) =
if (k == k1) new Map3(k2, v2, k3, v3, k4, v4)
else if (k == k2) new Map3(k1, v1, k3, v3, k4, v4)
else if (k == k3) new Map3(k1, v1, k2, v2, k4, v4)
else if (k == k4) new Map3(k1, v1, k2, v2, k3, v3)
else this
def updated[V1 >: V <: AnyRef](k: K, v: V1) =
if (k == k1) new Map4(k, v, k2, v2, k3, v3, k4, v4)
else if (k == k2) new Map4(k1, v1, k, v, k3, v3, k4, v4)
else if (k == k3) new Map4(k1, v1, k2, v2, k, v, k4, v4)
else if (k == k4) new Map4(k1, v1, k2, v2, k3, v3, k, v)
else new Map5(k1, v1, k2, v2, k3, v3, k4, v4, k, v)
def mapValues[V1 >: V <: AnyRef](f: V1 => V1) = {
val w1 = f(v1); val w2 = f(v2); val w3 = f(v3); val w4 = f(v4)
if ((v1 eq w1) && (v2 eq w2) && (v3 eq w3) && (v4 eq w4)) this
else new Map4(k1, w1, k2, w2, k3, w3, k4, w4)
}
def foreachKey(f: K => Unit) = { f(k1); f(k2); f(k3); f(k4) }
}
class Map5[K, +V >: Null <: AnyRef] (k1: K, v1: V, k2: K, v2: V, k3: K, v3: V, k4: K, v4: V, k5: K, v5: V) extends SimpleMap[K, V] {
def size = 5
def apply(k: K) =
if (k == k1) v1
else if (k == k2) v2
else if (k == k3) v3
else if (k == k4) v4
else if (k == k5) v5
else null
def remove(k: K) =
if (k == k1) new Map4(k2, v2, k3, v3, k4, v4, k5, v5)
else if (k == k2) new Map4(k1, v1, k3, v3, k4, v4, k5, v5)
else if (k == k3) new Map4(k1, v1, k2, v2, k4, v4, k5, v5)
else if (k == k4) new Map4(k1, v1, k2, v2, k3, v3, k5, v5)
else if (k == k5) new Map4(k1, v1, k2, v2, k3, v3, k4, v4)
else this
def updated[V1 >: V <: AnyRef](k: K, v: V1) =
if (k == k1) new Map5(k, v, k2, v2, k3, v3, k4, v4, k5, v5)
else if (k == k2) new Map5(k1, v1, k, v, k3, v3, k4, v4, k5, v5)
else if (k == k3) new Map5(k1, v1, k2, v2, k, v, k4, v4, k5, v5)
else if (k == k4) new Map5(k1, v1, k2, v2, k3, v3, k, v, k5, v5)
else if (k == k5) new Map5(k1, v1, k2, v2, k3, v3, k4, v4, k, v)
else new MapMore(Map(k1 -> v1, k2 -> v2, k3 -> v3, k4 -> v4, k5 -> v5, k -> v))
def mapValues[V1 >: V <: AnyRef](f: V1 => V1) = {
val w1 = f(v1); val w2 = f(v2); val w3 = f(v3); val w4 = f(v4); val w5 = f(v5)
if ((v1 eq w1) && (v2 eq w2) && (v3 eq w3) && (v4 eq w4) && (v5 eq w5)) this
else new Map5(k1, w1, k2, w2, k3, w3, k4, w4, k5, w5)
}
def foreachKey(f: K => Unit) = { f(k1); f(k2); f(k3); f(k4); f(k5) }
}
class MapMore[K, +V >: Null <: AnyRef] (m: Map[K, V]) extends SimpleMap[K, V] {
def size = m.size
def apply(k: K) = m get k match {
case Some(v) => v
case None => null
}
def remove(k: K) = {
val m1 = m - k
if (m1.size > 5) new MapMore(m1)
else {
val List((k1, v1), (k2, v2), (k3, v3), (k4, v4), (k5, v5)) = m1.toList
new Map5(k1, v1, k2, v2, k3, v3, k4, v4, k5, v5)
}
}
def updated[V1 >: V <: AnyRef](k: K, v: V1) =
new MapMore(m.updated(k, v))
override def contains(k: K) = m contains k
def mapValues[V1 >: V <: AnyRef](f: V1 => V1) = {
val assocs = m.toList
val assocs1 = assocs mapConserve {
case assoc @ (k, v) =>
val w = f(v)
if (w eq v) assoc else (k, w)
}
if (assocs1 eq assocs) this else new MapMore(assocs1.toMap)
}
def foreachKey(f: K => Unit) = { m.keysIterator foreach f }
}
}
|
