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package mill.moduledefs
import scala.reflect.internal.Flags
import scala.tools.nsc.io.VirtualFile
import scala.tools.nsc.util.BatchSourceFile
import scala.tools.nsc.{Global, Phase}
import scala.tools.nsc.plugins.{Plugin, PluginComponent}
class AutoOverridePlugin(val global: Global) extends Plugin {
import global._
override def init(options: List[String], error: String => Unit): Boolean = true
val name = "auto-override-plugin"
val description = "automatically inserts `override` keywords for you"
val components = List[PluginComponent](
new PluginComponent {
val global = AutoOverridePlugin.this.global
import global._
override val runsAfter = List("typer")
override val runsBefore = List("patmat")
val phaseName = "auto-override"
override def newPhase(prev: Phase) = new GlobalPhase(prev) {
def name: String = phaseName
def isCacher(owner: Symbol) = {
val baseClasses =
if (owner.isClass) Some(owner.asClass.baseClasses)
else if (owner.isModule) Some(owner.asModule.baseClasses)
else None
baseClasses.exists(_.exists(_.fullName == "mill.moduledefs.Cacher"))
}
def apply(unit: global.CompilationUnit): Unit = {
object AutoOverrider extends global.Transformer {
override def transform(tree: global.Tree) = tree match{
case d: DefDef
if d.symbol.overrideChain.count(!_.isAbstract) > 1
&& !d.mods.isOverride
&& isCacher(d.symbol.owner) =>
d.symbol.flags = d.symbol.flags | Flags.OVERRIDE
copyDefDef(d)(mods = d.mods | Flags.OVERRIDE)
case _ => super.transform(tree)
}
}
unit.body = AutoOverrider.transform(unit.body)
}
}
}
)
}
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