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/* NSC -- new scala compiler
* Copyright 2005 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc.typechecker;
import symtab.Flags._;
import scala.collection.immutable.ListMap;
import scala.tools.nsc.util.{ListBuffer, FreshNameCreator};
[_trait_] abstract class Codification: Analyzer {
import global._;
case class FreeValue(tree: Tree) extends reflect.Code;
type ReifyEnvironment = ListMap[Symbol, reflect.Symbol];
class Reifier(env: ReifyEnvironment, currentOwner: reflect.Symbol) {
def reify(tree: Tree): reflect.Code = tree match {
case Ident(_) =>
val rsym = reify(tree.symbol);
if (rsym == reflect.NoSymbol) FreeValue(tree)
else reflect.Ident(rsym)
case Select(qual, _) =>
val rsym = reify(tree.symbol);
if (rsym == reflect.NoSymbol) throw new TypeError("cannot reify symbol: " + tree.symbol)
else reflect.Select(reify(qual), reify(tree.symbol))
case Literal(constant) =>
reflect.Literal(constant.value)
case Apply(fun, args) =>
reflect.Apply(reify(fun), args map reify)
case TypeApply(fun, args) =>
reflect.TypeApply(reify(fun), args map (.tpe) map reify)
case Function(vparams, body) =>
var env1 = env;
for (val vparam <- vparams) {
val local = reflect.LocalValue(
currentOwner, vparam.symbol.name.toString(), reify(vparam.symbol.tpe));
env1 = env1.update(vparam.symbol, local);
}
reflect.Function(vparams map (.symbol) map env1,
new Reifier(env1, currentOwner).reify(body))
case This(_) =>
reflect.This(reify(tree.symbol))
case _ =>
throw new TypeError("cannot reify tree: " + tree)
}
private def mkGlobalSymbol(fullname: String, sym: Symbol): reflect.Symbol =
if (sym.isClass) reflect.Class(fullname)
else if (sym.isType) reflect.TypeField(fullname, reify(sym.info))
else if (sym.isMethod) reflect.Method(fullname, reify(sym.info))
else reflect.Field(fullname, reify(sym.info));
def reify(sym: Symbol): reflect.Symbol = env.get(sym) match {
case Some(rsym) =>
rsym
case None =>
if (sym.isRoot || sym.isRootPackage || sym.isEmptyPackageClass || sym.isEmptyPackage)
reflect.RootSymbol
else reify(sym.owner) match {
case reflect.NoSymbol =>
reflect.NoSymbol;
case reflect.RootSymbol =>
mkGlobalSymbol(sym.name.toString(), sym)
case reflect.Class(ownername) =>
mkGlobalSymbol(ownername + "." + sym.name, sym)
case _ =>
reflect.NoSymbol
}
}
def reify(tp: Type): reflect.Type = null /*tp match {
case NoPrefix =>
reflect.NoPrefix
case NoType =>
reflect.NoType
case TypeRef(pre, sym, args) =>
val tp = if (sym.owner.isPackageClass) reflect.NamedType(sym.fullNameString);
else reflect.PrefixedType(reify(pre), reify(sym));
if (args.isEmpty) tp else reflect.AppliedType(tp, args map reify)
case SingleType(pre, sym) =>
reflect.SingleType(reify(pre), reify(sym))
case ThisType(clazz) =>
reflect.ThisType(reify(clazz))
case TypeBounds(lo, hi) =>
reflect.TypeBounds(reify(lo), reify(hi))
case MethodType(formals, restp) =>
val formals1 = formals map reify;
val restp1 = reify(restp);
if (tp.isInstanceOf[ImplicitMethodType]) new reflect.ImplicitMethodType(formals1, restp1)
else reflect.MethodType(formals1, restp1)
//case PolyType(typeParams, ClassInfoType(parents, decls, symbol)) => reflect.PolyType(typeParams map reify, Nil, resultType)
//case PolyType(typeParams, SingleType(pre, sym)) => reflect.PolyType(typeParams map reify, Nil, resultType)
case PolyType(typeParams, MethodType(paramsList, resultType)) =>
System.err.println("poly polyyyy");
reflect.PolyType(Nil, Nil , reify(resultType)) //typeParams map mkTypeBounds
case _ =>
throw new TypeError("cannot reify type: " + tp)
}*/
}
type InjectEnvironment = ListMap[reflect.Symbol, Name];
class Injector(env: InjectEnvironment, fresh: FreshNameCreator) {
// todo replace className by caseName in CaseClass once we have switched to nsc.
def className(value: CaseClass): String = value match {
case _ :: _ => "scala.$colon$colon"
case reflect.Ident(_) => "scala.reflect.Ident"
case reflect.Select(_, _) => "scala.reflect.Select"
case reflect.Literal(_) => "scala.reflect.Literal"
case reflect.Apply(_, _) => "scala.reflect.Apply"
case reflect.TypeApply(_, _) => "scala.reflect.TypeApply"
case reflect.Function(_, _) => "scala.reflect.Function"
case reflect.Class(_) => "scala.reflect.Class"
case reflect.Method(_, _) => "scala.reflect.Method"
case reflect.Field(_, _) => "scala.reflect.Field"
case reflect.This(_) => "scala.reflect.This"
case reflect.NamedType(_) => "scala.reflect.NamedType"
case reflect.PrefixedType(_, _) => "scala.reflect.PrefixedType"
case reflect.SingleType(_, _) => "scala.reflect.SingleType"
case reflect.ThisType(_) => "scala.reflect.ThisType"
case reflect.AppliedType(_, _) => "scala.reflect.AppliedType"
case reflect.TypeBounds(_, _) => "scala.reflect.TypeBounds"
case reflect.MethodType(_, _) =>
if (value.isInstanceOf[reflect.ImplicitMethodType]) "scala.reflect.ImplicitMethodType" else "scala.reflect.MethodType"
case reflect.PolyType(_, _, _) => "scala.reflect.PolyType"
case _ =>
""
}
def objectName(value: Any): String = value match {
case Nil => "scala.Nil"
case reflect.NoSymbol => "scala.reflect.NoSymbol"
case reflect.RootSymbol => "scala.reflect.RootSymbol"
case reflect.NoPrefix => "scala.reflect.NoPrefix"
case reflect.NoType => "scala.reflect.NoType"
case _ => ""
}
def injectType(name: String): Tree = TypeTree(definitions.getClass(name).initialize.tpe);
def inject(value: Any): Tree = value match {
case FreeValue(tree) =>
tree
case reflect.Function(params, body) =>
var env1 = env;
val vdefs = for (val param <- params) yield {
val lname = newTermName(fresh.newName());
env1 = env1.update(param, lname);
ValDef(0, lname, injectType("scala.reflect.LocalValue"),
New(injectType("scala.reflect.LocalValue"),
List(List(inject(param.owner), inject(param.name), inject(param.tpe)))))
}
Block(vdefs, new Injector(env1, fresh).inject(body))
case rsym: reflect.LocalSymbol =>
Ident(env(rsym))
case x: String => Literal(Constant(x))
case x: Boolean => Literal(Constant(x))
case x: Byte => Literal(Constant(x))
case x: Short => Literal(Constant(x))
case x: Char => Literal(Constant(x))
case x: Int => Literal(Constant(x))
case x: Long => Literal(Constant(x))
case x: Float => Literal(Constant(x))
case x: Double => Literal(Constant(x))
case c: CaseClass =>
val name = objectName(c);
if (name.length() != 0) gen.mkRef(definitions.getModule(name))
else {
val name = className(c);
if (name.length() == 0) throw new Error("don't know how to inject " + value);
val injectedArgs = new ListBuffer[Tree];
for (val i <- Iterator.range(0, c.caseArity))
injectedArgs += inject(c.caseElement(i));
New(Ident(definitions.getClass(name)), List(injectedArgs.toList))
}
case null => gen.mkRef(definitions.getModule("scala.reflect.NoType"))
case _ => throw new Error("don't know how to inject " + value);
}
}
def reify(tree: Tree): reflect.Code =
new Reifier(ListMap.Empty, reflect.NoSymbol).reify(tree);
def inject(code: reflect.Code): Tree =
new Injector(ListMap.Empty, new FreshNameCreator).inject(code);
/** returns
* < new TypedCode[T](tree1) >
* where T = tree.tpe
* tree1 = inject(reify(tree))
*/
def codify(tree: Tree): Tree = {
val reified = reify(tree);
if (settings.debug.value) log("reified = " + reified);
val injected = inject(reified);
if (settings.debug.value) log("injected = " + injected);
New(TypeTree(appliedType(definitions.TypedCodeClass.typeConstructor, List(tree.tpe))),
List(List(injected)));
}
}
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