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/* NSC -- new scala compiler
* Copyright 2005 LAMP/EPFL
* @author
*/
// $Id$
package scala.tools.nsc.typechecker;
import symtab.Flags._;
import util.FreshNameCreator;
import scala.collection.mutable.ListBuffer;
/**
* - caseArity, caseElement implementations added to case classes
* - equals, and hashCode and toString methods are added to case classes,
* unless they are defined in the class or a baseclass
* different from java.lang.Object
* - toString method is added to case objects,
* unless they are defined in the class or a baseclass
* different from java.lang.Object
*/
mixin class SyntheticMethods requires Analyzer {
import global._; // the global environment
import definitions._; // standard classes and methods
import typer.{typed}; // methods to type trees
def addSyntheticMethods(templ: Template, clazz: Symbol, unit: CompilationUnit): Template = {
def hasImplementation(name: Name): boolean = {
val sym = clazz.info.nonPrivateMember(name);
(sym.isTerm &&
(sym.owner == clazz ||
!(ObjectClass isSubClass sym.owner) && !(sym hasFlag DEFERRED)))
}
def syntheticMethod(name: Name, flags: int, tpe: Type) =
newSyntheticMethod(name, flags | OVERRIDE, tpe);
def newSyntheticMethod(name: Name, flags: int, tpe: Type) = {
val method = clazz.newMethod(clazz.pos, name) setFlag (flags) setInfo tpe;
clazz.info.decls.enter(method);
method
}
def caseElementMethod: Tree = {
val method = syntheticMethod(
nme.caseElement, FINAL, MethodType(List(IntClass.tpe), AnyClass.tpe));
val caseFields = clazz.caseFieldAccessors map gen.mkRef;
typed(
DefDef(method, vparamss =>
if (caseFields.isEmpty) Literal(Constant(null))
else {
var i = caseFields.length;
var cases = List(CaseDef(Ident(nme.WILDCARD), EmptyTree, Literal(Constant(null))));
for (val field <- caseFields.reverse) {
i = i - 1; cases = CaseDef(Literal(Constant(i)), EmptyTree, field) :: cases
}
Match(Ident(vparamss.head.head), cases)
}))
}
def caseArityMethod: Tree = {
val method = syntheticMethod(nme.caseArity, FINAL, PolyType(List(), IntClass.tpe));
typed(DefDef(method, vparamss => Literal(Constant(clazz.caseFieldAccessors.length))))
}
def caseNameMethod: Tree = {
val method = syntheticMethod(nme.caseName, FINAL, PolyType(List(), StringClass.tpe));
typed(DefDef(method, vparamss => Literal(Constant(clazz.name.decode))))
}
def moduleToStringMethod: Tree = {
val method = syntheticMethod(nme.toString_, FINAL, MethodType(List(), StringClass.tpe));
typed(DefDef(method, vparamss => Literal(Constant(clazz.name.decode))))
}
def tagMethod: Tree = {
val method = syntheticMethod(nme.tag, FINAL, MethodType(List(), IntClass.tpe));
typed(DefDef(method, vparamss => Literal(Constant(clazz.tag))))
}
def forwardingMethod(name: Name): Tree = {
val target = getMember(ScalaRunTimeModule, "_" + name);
val method = syntheticMethod(
name, 0, MethodType(target.tpe.paramTypes.tail, target.tpe.resultType));
typed(DefDef(method, vparamss =>
Apply(gen.mkRef(target), This(clazz) :: (vparamss.head map Ident))));
}
val SerializableAttr = definitions.SerializableAttr.tpe;
def isSerializable(clazz: Symbol): Boolean =
clazz.attributes.exists(p => p match {
case Pair(SerializableAttr, _) => true;
case _ => false
})
def readResolveMethod: Tree = {
// !!! the synthetic method "readResolve" should be private,
// but then it is renamed !!!
val method = newSyntheticMethod(nme.readResolve, PROTECTED,
MethodType(List(), ObjectClass.tpe));
typed(DefDef(method, vparamss => gen.mkRef(clazz.sourceModule)))
}
def newAccessorMethod(tree: Tree): Tree = tree match {
case DefDef(_, _, _, _, _, rhs) =>
val newAcc = tree.symbol.cloneSymbol;
newAcc.name = unit.fresh.newName(""+tree.symbol.name+"$");
newAcc.setFlag(SYNTHETIC).resetFlag(ACCESSOR | PARAMACCESSOR);
newAcc.owner.info.decls enter newAcc;
val result = typed(DefDef(newAcc, vparamss => rhs.duplicate));
System.out.println("new acc method " + result)
result
}
def beanSetterOrGetter(sym: Symbol): Symbol =
if (!Character.isLetter(sym.name(0))) {
unit.error(sym.pos, "attribute `BeanProperty' can be applied only to fields that start with a letter");
NoSymbol
} else {
var name0 = sym.name;
if (sym.isSetter) name0 = nme.setterToGetter(name0);
val prefix = if (sym.isSetter) "set" else "get";
val arity = if (sym.isSetter) 1 else 0;
val name1 = prefix + Character.toUpperCase(name0(0)) + name0.subName(1, name0.length);
val sym1 = clazz.info.decl(name1);
if (sym1 != NoSymbol && sym1.tpe.paramTypes.length == arity) {
unit.error(sym.pos, "a definition of `"+name1+"' already exists in " + clazz);
NoSymbol
} else {
clazz.newMethod(sym.pos, name1)
.setInfo(sym.info)
.setFlag(sym.getFlag(DEFERRED | OVERRIDE | STATIC))
}
}
val ts = new ListBuffer[Tree];
def addBeanGetterMethod(sym: Symbol) = {
val getter = beanSetterOrGetter(sym);
if (getter != NoSymbol)
ts += typed(DefDef(
getter,
vparamss => if (sym hasFlag DEFERRED) EmptyTree else gen.mkRef(sym)))
}
def addBeanSetterMethod(sym: Symbol) = {
val setter = beanSetterOrGetter(sym);
if (setter != NoSymbol)
ts += typed(DefDef(
setter,
vparamss =>
if (sym hasFlag DEFERRED) EmptyTree
else Apply(gen.mkRef(sym), List(Ident(vparamss.head.head)))))
}
if ((clazz hasFlag CASE) && !phase.erasedTypes) {
// case classes are implicitly declared serializable
clazz.attributes = Pair(SerializableAttr, List()) :: clazz.attributes;
for (val stat <- templ.body) {
if (stat.isDef && stat.symbol.isMethod && stat.symbol.hasFlag(CASEACCESSOR) &&
(stat.symbol.hasFlag(PRIVATE | PROTECTED) || stat.symbol.privateWithin != NoSymbol)) {
ts += newAccessorMethod(stat);
stat.symbol.resetFlag(CASEACCESSOR)
}
}
ts += tagMethod;
if (clazz.isModuleClass) {
if (!hasImplementation(nme.toString_)) ts += moduleToStringMethod;
} else {
if (!hasImplementation(nme.hashCode_)) ts += forwardingMethod(nme.hashCode_);
if (!hasImplementation(nme.toString_)) ts += forwardingMethod(nme.toString_);
if (!hasImplementation(nme.equals_)) ts += forwardingMethod(nme.equals_);
}
if (!hasImplementation(nme.caseElement)) ts += caseElementMethod;
if (!hasImplementation(nme.caseArity)) ts += caseArityMethod;
if (!hasImplementation(nme.caseName)) ts += caseNameMethod;
}
if (!phase.erasedTypes && clazz.isModuleClass && isSerializable(clazz)) {
// If you serialize a singleton and then deserialize it twice,
// you will have two instances of your singleton, unless you implement
// the readResolve() method (see http://www.javaworld.com/javaworld/
// jw-04-2003/jw-0425-designpatterns_p.html)
if (!hasImplementation(nme.readResolve)) ts += readResolveMethod;
}
for (val sym <- clazz.info.decls.toList)
if (!sym.getAttributes(BeanPropertyAttr).isEmpty)
if (sym.isGetter)
addBeanGetterMethod(sym)
else if (sym.isSetter)
addBeanSetterMethod(sym)
else if (sym.isMethod || sym.isType)
unit.error(sym.pos, "attribute `BeanProperty' is not applicable to " + sym);
val synthetics = ts.toList;
copy.Template(
templ, templ.parents, if (synthetics.isEmpty) templ.body else templ.body ::: synthetics)
}
}
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