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/* NEST (New Scala Test)
* Copyright 2007-2011 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools
package cmd
package program
import Spec.Info
/** A boilerplate reducer for commands with simple requirements. For examples,
* see Scmp and Tokens in this package.
*/
object Simple {
type CommandLineTransform = SimpleCommandLine => SimpleCommandLine
abstract class SimpleSpec(val programInfo: Info) extends Spec with Meta.StdOpts with Interpolation
trait SimpleInstance extends SimpleSpec with Instance {
val parsed: CommandLine
}
class SimpleReference(
programInfo: Info,
unary: List[(String, String)] = Nil,
binary: List[(String, String)] = Nil,
postCreation: CommandLineTransform = null
) extends SimpleSpec(programInfo) with Reference {
spec =>
if (programInfo.usage != "") help(programInfo.usage)
unary foreach { case (option, help) => option / help --? }
binary foreach { case (option, help) => option / help --| }
type ThisCommandLine = SimpleCommandLine
def creator(args: List[String]) = new SimpleCommandLine(spec, args)
def instance(args: Array[String]): SimpleInstance = instance(args.toList)
def instance(args: List[String]): SimpleInstance =
new {
val parsed = spec(args: _*)
} with SimpleSpec(programInfo) with SimpleInstance {
lazy val referenceSpec = spec
}
lazy val referenceSpec = spec
}
def apply(info: Info, unary: List[(String, String)], binary: List[(String, String)], postCreation: CommandLineTransform): SimpleReference = {
new SimpleReference(info, unary, binary, postCreation) {
override def creator(args: List[String]) = {
val obj = super.creator(args)
if (postCreation == null) obj
else postCreation(obj)
}
}
}
def scalaProgramInfo(name: String, help: String) =
Spec.Info(name, help, "scala.tools.cmd.program." + name.capitalize)
/** You can't override a def with a var unless a setter exists. We cleverly
* sidestep this by mixing in a trait with dummy setters which will be
* inaccessible due to the overriding var.
*/
trait Ticket2338WontFixWorkaround {
def enforceArity_=(x: Boolean): Unit = sys.error("unreachable")
def onlyKnownOptions_=(x: Boolean): Unit = sys.error("unreachable")
}
/** Configurability simplicity achieved by turning defs into vars and letting
* the spec creator apply a transformation. This way there's no need to create
* custom subclasses of CommandLine.
*/
class SimpleCommandLine(spec: Reference, args: List[String]) extends CommandLine(spec, args) with Ticket2338WontFixWorkaround {
override var enforceArity: Boolean = true
override var onlyKnownOptions: Boolean = true
}
}
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