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package plugintemplate
import scala.tools.nsc._
import scala.tools.nsc.plugins.PluginComponent
import scala.tools.nsc.transform.InfoTransform
// import scala.tools.nsc.transform.TypingTransformers
/** This class implements a plugin component using tree transformers and
* InfoTransformer. An InfoTransformer will be automatically created
* and registered in <code>SymbolTable.infoTransformers</code>. If
* a <code>Typer</code> is needed during transformation, the component
* should mix in <code>TypingTransformers</code>. This provides a local
* variable <code>localTyper: Typer</code> that is always updated to
* the current context.
*
* @todo Adapt the name of this class to the plugin, and implement it.
*/
class TemplateInfoTransformComponent(val global: Global) extends PluginComponent
// with TypingTransformers
with InfoTransform {
import global._
import global.definitions._
val runsAfter = List[String]("refchecks")
/** The phase name of the compiler plugin
* @todo Adapt to specific plugin.
*/
val phaseName = "plugintemplateinfotransform"
def transformInfo(sym: Symbol, tp: Type): Type = infoTransformer.mapOver(tp)
def newTransformer(unit: CompilationUnit) = new TemplateTransformer
/** The type transformation applied by this component. The trait InfoTransform
* will create an instance of InfoTransformer applying this TypeMap. The type
* map will be applied when computing a symbol's type in all phases
* <em>after</em> "plugintemplateinfotransform".
*
* @todo Implement.
*/
private val infoTransformer = new TypeMap {
def apply(tp: Type): Type = tp match {
case MethodType(pts, rt) =>
println("methodType (_, _, ..) => "+ rt)
tp
case _ => mapOver(tp)
}
}
/** The tree transformer that implements the behavior of this
* component. Change the superclass to <code>TypingTransformer</code>
* to make a local typechecker <code>localTyper</code> available.
*
* @todo Implement.
*/
class TemplateTransformer extends /*Typing*/ Transformer {
/** When using <code>preTransform</code>, each node is
* visited before its children.
*/
def preTransform(tree: Tree): Tree = tree match {
case ValDef(_, name, _, _) =>
println("pre-info-transforming valdef "+ name)
tree
case _ => tree
}
/** When using <code>postTransform</code>, each node is
* visited after its children.
*/
def postTransform(tree: Tree): Tree = tree match {
case _ => tree
}
override def transform(tree: Tree): Tree = {
postTransform(super.transform(preTransform(tree)))
}
}
}
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