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Diffstat (limited to 'src/partest-extras/scala/org/scalacheck/Commands.scala')
| -rw-r--r-- | src/partest-extras/scala/org/scalacheck/Commands.scala | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/src/partest-extras/scala/org/scalacheck/Commands.scala b/src/partest-extras/scala/org/scalacheck/Commands.scala deleted file mode 100644 index 5ff3a397e5..0000000000 --- a/src/partest-extras/scala/org/scalacheck/Commands.scala +++ /dev/null @@ -1,146 +0,0 @@ -/*-------------------------------------------------------------------------*\ -** ScalaCheck ** -** Copyright (c) 2007-2014 Rickard Nilsson. All rights reserved. ** -** http://www.scalacheck.org ** -** ** -** This software is released under the terms of the Revised BSD License. ** -** There is NO WARRANTY. See the file LICENSE for the full text. ** -\*------------------------------------------------------------------------ */ - -package org.scalacheck - -/** See User Guide for usage examples */ -@deprecated("Will be replaced with a new implementation in 1.12.0", "1.11.4") -trait Commands extends Prop { - - /** The abstract state data type. This type must be immutable. - * The state type that encodes the abstract state. The abstract state - * should model all the features we need from the real state, the system - * under test. We should leave out all details that aren't needed for - * specifying our pre- and postconditions. The state type must be called - * State and be immutable. */ - type State <: AnyRef - - class Binding(private val key: State) { - def get: Any = bindings.find(_._1 eq key) match { - case None => sys.error("No value bound") - case Some(x) => x._2 - } - } - - /** Abstract commands are defined as subtypes of the traits Command or SetCommand. - * Each command must have a run method and a method that returns the new abstract - * state, as it should look after the command has been run. - * A command can also define a precondition that states how the current - * abstract state must look if the command should be allowed to run. - * Finally, we can also define a postcondition which verifies that the - * system under test is in a correct state after the command exectution. */ - trait Command { - - /** Used internally. */ - protected[Commands] def run_(s: State) = run(s) - - def run(s: State): Any - def nextState(s: State): State - - /** Returns all preconditions merged into a single function */ - def preCondition: (State => Boolean) = - s => preConditions.toList.forall(_.apply(s)) - - /** A precondition is a function that - * takes the current abstract state as parameter and returns a boolean - * that says if the precondition is fulfilled or not. You can add several - * conditions to the precondition list */ - val preConditions = new collection.mutable.ListBuffer[State => Boolean] - - /** Returns all postconditions merged into a single function */ - def postCondition: (State,State,Any) => Prop = - (s0,s1,r) => Prop.all(postConditions.map(_.apply(s0,s1,r)): _*) - - /** A postcondition is a function that - * takes three parameters, s0, s1 and r. s0 is the abstract state before - * the command was run, s1 is the abstract state after the command was - * run, and r is the result from the command's run - * method. The postcondition function should return a Boolean (or - * a Prop instance) that says if the condition holds or not. You can add several - * conditions to the postConditions list. */ - val postConditions = new collection.mutable.ListBuffer[(State,State,Any) => Prop] - } - - /** A command that binds its result for later use */ - trait SetCommand extends Command { - /** Used internally. */ - protected[Commands] final override def run_(s: State) = { - val r = run(s) - bindings += ((s,r)) - r - } - - final def nextState(s: State) = nextState(s, new Binding(s)) - def nextState(s: State, b: Binding): State - } - - private case class Cmds(cs: List[Command], ss: List[State]) { - override def toString = cs.map(_.toString).mkString(", ") - } - - private val bindings = new scala.collection.mutable.ListBuffer[(State,Any)] - - private def initState() = { - bindings.clear() - initialState() - } - - private def genCmds: Gen[Cmds] = { - def sizedCmds(s: State, sz: Int): Gen[Cmds] = { - if(sz <= 0) Gen.const(Cmds(Nil, Nil)) else for { - c <- genCommand(s) suchThat (_.preCondition(s)) - Cmds(cs,ss) <- sizedCmds(c.nextState(s), sz-1) - } yield Cmds(c::cs, s::ss) - } - - Gen.sized(sz => sizedCmds(initialState(), sz)) - } - - private def validCmds(s: State, cs: List[Command]): Option[Cmds] = - cs match { - case Nil => Some(Cmds(Nil, s::Nil)) - case c::_ if !c.preCondition(s) => None - case c::cmds => for { - Cmds(_, ss) <- validCmds(c.nextState(s), cmds) - } yield Cmds(cs, s::ss) - } - - private def runCommands(cmds: Cmds): Prop = Prop.all { - cmds.cs.indices.map { i => - val (c,s) = (cmds.cs(i), cmds.ss(i)) - c.postCondition(s,c.nextState(s),c.run_(s)) - } : _* - } - - private def commandsProp: Prop = { - def shrinkCmds(cmds: Cmds) = - Shrink.shrink(cmds.cs)(Shrink.shrinkContainer).flatMap { cs => - validCmds(initialState(), cs).toList - } - - Prop.forAllShrink(genCmds label "COMMANDS", shrinkCmds)(runCommands _) - } - - def apply(p: Gen.Parameters) = commandsProp(p) - - /** initialState should reset the system under test to a well defined - * initial state, and return the abstract version of that state. */ - def initialState(): State - - /** The command generator. Given an abstract state, the generator - * should return a command that is allowed to run in that state. Note that - * it is still neccessary to define preconditions on the commands if there - * are any. The generator is just giving a hint of which commands that are - * suitable for a given state, the preconditions will still be checked before - * a command runs. Sometimes you maybe want to adjust the distribution of - * your command generator according to the state, or do other calculations - * based on the state. */ - def genCommand(s: State): Gen[Command] - -} |