diff options
Diffstat (limited to 'docs/examples/monads')
-rw-r--r-- | docs/examples/monads/callccInterpreter.scala | 18 | ||||
-rw-r--r-- | docs/examples/monads/directInterpreter.scala | 14 | ||||
-rw-r--r-- | docs/examples/monads/errorInterpreter.scala | 10 | ||||
-rw-r--r-- | docs/examples/monads/simpleInterpreter.scala | 14 | ||||
-rw-r--r-- | docs/examples/monads/stateInterpreter.scala | 24 |
5 files changed, 40 insertions, 40 deletions
diff --git a/docs/examples/monads/callccInterpreter.scala b/docs/examples/monads/callccInterpreter.scala index 5b556bd8fa..b5008c4c1b 100644 --- a/docs/examples/monads/callccInterpreter.scala +++ b/docs/examples/monads/callccInterpreter.scala @@ -14,7 +14,7 @@ object callccInterpreter { def showM(m: M[Value]): String = (m in id).toString(); - def callCC[A](h: (A => M[A]) => M[A]) = + def callCC[A](h: (A => M[A]) => M[A]) = M[A](c => h(a => M[A](d => c(a))) in c); type Name = String; @@ -30,7 +30,7 @@ object callccInterpreter { trait Value; case object Wrong extends Value { override def toString() = "wrong" - } + } case class Num(n: Int) extends Value { override def toString() = n.toString(); } @@ -38,15 +38,15 @@ object callccInterpreter { override def toString() = "<function>" } - type Environment = List[Pair[Name, Value]]; + type Environment = List[Tuple2[Name, Value]]; def lookup(x: Name, e: Environment): M[Value] = e match { case List() => unitM(Wrong) - case Pair(y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1) + case (y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1) } - def add(a: Value, b: Value): M[Value] = Pair(a, b) match { - case Pair(Num(m), Num(n)) => unitM(Num(m + n)) + def add(a: Value, b: Value): M[Value] = (a, b) match { + case (Num(m), Num(n)) => unitM(Num(m + n)) case _ => unitM(Wrong) } @@ -62,15 +62,15 @@ object callccInterpreter { b <- interp(r, e); c <- add(a, b)) yield c - case Lam(x, t) => unitM(Fun(a => interp(t, Pair(x, a) :: e))) + case Lam(x, t) => unitM(Fun(a => interp(t, (x, a) :: e))) case App(f, t) => for (a <- interp(f, e); b <- interp(t, e); c <- apply(a, b)) yield c - case Ccc(x, t) => callCC(k => interp(t, Pair(x, Fun(k)) :: e)) + case Ccc(x, t) => callCC(k => interp(t, (x, Fun(k)) :: e)) } - def test(t: Term): String = + def test(t: Term): String = showM(interp(t, List())); val term0 = App(Lam("x", Add(Var("x"), Var("x"))), Add(Con(10), Con(11))); diff --git a/docs/examples/monads/directInterpreter.scala b/docs/examples/monads/directInterpreter.scala index 06fffba8e2..d8ca8ccfa7 100644 --- a/docs/examples/monads/directInterpreter.scala +++ b/docs/examples/monads/directInterpreter.scala @@ -20,15 +20,15 @@ object directInterpreter { case Fun(f) => "<function>" } - type Environment = List[Pair[Name, Value]]; + type Environment = List[Tuple2[Name, Value]]; def lookup(x: Name, e: Environment): Value = e match { case List() => Wrong - case Pair(y, b) :: e1 => if (x == y) b else lookup(x, e1) + case (y, b) :: e1 => if (x == y) b else lookup(x, e1) } - def add(a: Value, b: Value): Value = Pair(a, b) match { - case Pair(Num(m), Num(n)) => Num(m + n) + def add(a: Value, b: Value): Value = (a, b) match { + case (Num(m), Num(n)) => Num(m + n) case _ => Wrong } @@ -41,15 +41,15 @@ object directInterpreter { case Var(x) => lookup(x, e) case Con(n) => Num(n) case Add(l, r) => add(interp(l, e), interp(r, e)) - case Lam(x, t) => Fun(a => interp(t, Pair(x, a) :: e)) + case Lam(x, t) => Fun(a => interp(t, (x, a) :: e)) case App(f, t) => apply(interp(f, e), interp(t, e)) } - def test(t: Term): String = + def test(t: Term): String = showval(interp(t, List())); val term0 = App(Lam("x", Add(Var("x"), Var("x"))), Add(Con(10), Con(11))); - def main(args: Array[String]) = + def main(args: Array[String]) = System.out.println(test(term0)); } diff --git a/docs/examples/monads/errorInterpreter.scala b/docs/examples/monads/errorInterpreter.scala index d3cc45627d..c15e1041e2 100644 --- a/docs/examples/monads/errorInterpreter.scala +++ b/docs/examples/monads/errorInterpreter.scala @@ -41,15 +41,15 @@ object errorInterpreter { override def toString() = "<function>" } - type Environment = List[Pair[Name, Value]] + type Environment = List[Tuple2[Name, Value]] def lookup(x: Name, e: Environment): M[Value] = e match { case List() => errorM("unbound variable: " + x); - case Pair(y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1) + case (y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1) } - def add(a: Value, b: Value): M[Value] = Pair(a, b) match { - case Pair(Num(m), Num(n)) => unitM(Num(m + n)) + def add(a: Value, b: Value): M[Value] = (a, b) match { + case (Num(m), Num(n)) => unitM(Num(m + n)) case _ => errorM("should be numbers: " + a + "," + b) } @@ -65,7 +65,7 @@ object errorInterpreter { b <- interp(r, e); c <- add(a, b)) yield c - case Lam(x, t) => unitM(Fun(a => interp(t, Pair(x, a) :: e))) + case Lam(x, t) => unitM(Fun(a => interp(t, (x, a) :: e))) case App(f, t) => for (a <- interp(f, e); b <- interp(t, e); c <- apply(a, b)) diff --git a/docs/examples/monads/simpleInterpreter.scala b/docs/examples/monads/simpleInterpreter.scala index cde3a92dbb..64636749ff 100644 --- a/docs/examples/monads/simpleInterpreter.scala +++ b/docs/examples/monads/simpleInterpreter.scala @@ -22,7 +22,7 @@ object simpleInterpreter { trait Value; case object Wrong extends Value { override def toString() = "wrong" - } + } case class Num(n: Int) extends Value { override def toString() = n.toString(); } @@ -30,15 +30,15 @@ object simpleInterpreter { override def toString() = "<function>" } - type Environment = List[Pair[Name, Value]]; + type Environment = List[Tuple2[Name, Value]]; def lookup(x: Name, e: Environment): M[Value] = e match { case List() => unitM(Wrong) - case Pair(y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1) + case (y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1) } - def add(a: Value, b: Value): M[Value] = Pair(a, b) match { - case Pair(Num(m), Num(n)) => unitM(Num(m + n)) + def add(a: Value, b: Value): M[Value] = (a, b) match { + case (Num(m), Num(n)) => unitM(Num(m + n)) case _ => unitM(Wrong) } @@ -54,14 +54,14 @@ object simpleInterpreter { b <- interp(r, e); c <- add(a, b)) yield c - case Lam(x, t) => unitM(Fun(a => interp(t, Pair(x, a) :: e))) + case Lam(x, t) => unitM(Fun(a => interp(t, (x, a) :: e))) case App(f, t) => for (a <- interp(f, e); b <- interp(t, e); c <- apply(a, b)) yield c } - def test(t: Term): String = + def test(t: Term): String = showM(interp(t, List())); val term0 = App(Lam("x", Add(Var("x"), Var("x"))), Add(Con(10), Con(11))); diff --git a/docs/examples/monads/stateInterpreter.scala b/docs/examples/monads/stateInterpreter.scala index 97f3335dab..e13e9049da 100644 --- a/docs/examples/monads/stateInterpreter.scala +++ b/docs/examples/monads/stateInterpreter.scala @@ -4,20 +4,20 @@ object stateInterpreter { type State = Int; - val tickS = new M(s => Pair((), s + 1)); + val tickS = new M(s => ((), s + 1)); - case class M[A](in: State => Pair[A, State]) { - def bind[B](k: A => M[B]) = M[B]{ s0 => - val Pair(a, s1) = this in s0; k(a) in s1 + case class M[A](in: State => Tuple2[A, State]) { + def bind[B](k: A => M[B]) = M[B]{ s0 => + val (a, s1) = this in s0; k(a) in s1 } def map[B](f: A => B): M[B] = bind(x => unitM(f(x))); def flatMap[B](f: A => M[B]): M[B] = bind(f); } - def unitM[A](a: A) = M[A](s => Pair(a, s)); + def unitM[A](a: A) = M[A](s => (a, s)); def showM(m: M[Value]): String = { - val Pair(a, s1) = m in 0; + val (a, s1) = m in 0; "Value: " + a + "; Count: " + s1 } @@ -41,15 +41,15 @@ object stateInterpreter { override def toString() = "<function>" } - type Environment = List[Pair[Name, Value]]; + type Environment = List[Tuple2[Name, Value]]; def lookup(x: Name, e: Environment): M[Value] = e match { case List() => unitM(Wrong) - case Pair(y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1) + case (y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1) } - def add(a: Value, b: Value): M[Value] = Pair(a, b) match { - case Pair(Num(m), Num(n)) => for (_ <- tickS) yield Num(m + n) + def add(a: Value, b: Value): M[Value] = (a, b) match { + case (Num(m), Num(n)) => for (_ <- tickS) yield Num(m + n) case _ => unitM(Wrong) } @@ -65,14 +65,14 @@ object stateInterpreter { b <- interp(r, e); c <- add(a, b)) yield c - case Lam(x, t) => unitM(Fun(a => interp(t, Pair(x, a) :: e))) + case Lam(x, t) => unitM(Fun(a => interp(t, (x, a) :: e))) case App(f, t) => for (a <- interp(f, e); b <- interp(t, e); c <- apply(a, b)) yield c } - def test(t: Term): String = + def test(t: Term): String = showM(interp(t, List())); val term0 = App(Lam("x", Add(Var("x"), Var("x"))), Add(Con(10), Con(11))); |