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trait Matcher {
trait Link {
type Self <: Link;
type Match <: Link { type Match = Link.this.Self; }
}
trait HasLinks {
def link(b : Boolean) : Link = null;
}
}
trait BraceMatcher extends Matcher {
trait BracePair {
trait BraceLink extends Link;
trait OpenLink extends BraceLink {
type Self = OpenLink;
type Match = CloseLink;
}
trait CloseLink extends BraceLink {
type Self = CloseLink;
type Match = OpenLink;
}
}
}
trait IfElseMatcher extends BraceMatcher {
trait IfElseLink extends Link;
trait IfLink extends IfElseLink {
type Self = IfLink;
type Match = ElseImpl;
}
trait ElseImpl extends IfElseLink with HasLinks {
type Self = ElseImpl;
type Match = IfLink;
override def link(b : Boolean) = this;
}
val parenPair : BracePair;
trait IfWithParenImpl extends HasLinks {
object ifLink extends IfLink;
object openParen extends parenPair.OpenLink;
override def link(b : Boolean): Link = b match {
case true => ifLink;
case false => openParen;
}
}
}
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