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/*
* Scala.js (https://www.scala-js.org/)
*
* Copyright EPFL.
*
* Licensed under Apache License 2.0
* (https://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package dotty.tools.sjs.ir
import scala.language.unsafeNulls
import Trees._
import Types._
import Version.Unversioned
object Transformers {
abstract class Transformer {
final def transformTreeOrJSSpread(tree: TreeOrJSSpread): TreeOrJSSpread = {
implicit val pos = tree.pos
tree match {
case JSSpread(items) => JSSpread(transform(items))
case tree: Tree => transform(tree)
}
}
final def transformTrees(trees: List[Tree]): List[Tree] =
trees.map(transform(_))
final def transformTreeOpt(treeOpt: Option[Tree]): Option[Tree] =
treeOpt.map(transform(_))
def transform(tree: Tree): Tree = {
implicit val pos = tree.pos
tree match {
// Definitions
case VarDef(ident, originalName, vtpe, mutable, rhs) =>
VarDef(ident, originalName, vtpe, mutable, transform(rhs))
// Control flow constructs
case Block(stats) =>
Block(transformTrees(stats))
case Labeled(label, tpe, body) =>
Labeled(label, tpe, transform(body))
case Assign(lhs, rhs) =>
Assign(transform(lhs).asInstanceOf[AssignLhs], transform(rhs))
case Return(expr, label) =>
Return(transform(expr), label)
case If(cond, thenp, elsep) =>
If(transform(cond), transform(thenp), transform(elsep))(tree.tpe)
case While(cond, body) =>
While(transform(cond), transform(body))
case ForIn(obj, keyVar, keyVarOriginalName, body) =>
ForIn(transform(obj), keyVar, keyVarOriginalName, transform(body))
case TryCatch(block, errVar, errVarOriginalName, handler) =>
TryCatch(transform(block), errVar, errVarOriginalName,
transform(handler))(tree.tpe)
case TryFinally(block, finalizer) =>
TryFinally(transform(block), transform(finalizer))
case Match(selector, cases, default) =>
Match(transform(selector), cases.map(c => (c._1, transform(c._2))),
transform(default))(tree.tpe)
// Scala expressions
case New(className, ctor, args) =>
New(className, ctor, transformTrees(args))
case Select(qualifier, field) =>
Select(transform(qualifier), field)(tree.tpe)
case Apply(flags, receiver, method, args) =>
Apply(flags, transform(receiver), method,
transformTrees(args))(tree.tpe)
case ApplyStatically(flags, receiver, className, method, args) =>
ApplyStatically(flags, transform(receiver), className, method,
transformTrees(args))(tree.tpe)
case ApplyStatic(flags, className, method, args) =>
ApplyStatic(flags, className, method, transformTrees(args))(tree.tpe)
case ApplyDynamicImport(flags, className, method, args) =>
ApplyDynamicImport(flags, className, method, transformTrees(args))
case UnaryOp(op, lhs) =>
UnaryOp(op, transform(lhs))
case BinaryOp(op, lhs, rhs) =>
BinaryOp(op, transform(lhs), transform(rhs))
case NewArray(tpe, length) =>
NewArray(tpe, transform(length))
case ArrayValue(tpe, elems) =>
ArrayValue(tpe, transformTrees(elems))
case ArraySelect(array, index) =>
ArraySelect(transform(array), transform(index))(tree.tpe)
case RecordValue(tpe, elems) =>
RecordValue(tpe, transformTrees(elems))
case RecordSelect(record, field) =>
RecordSelect(transform(record), field)(tree.tpe)
case IsInstanceOf(expr, testType) =>
IsInstanceOf(transform(expr), testType)
case AsInstanceOf(expr, tpe) =>
AsInstanceOf(transform(expr), tpe)
// JavaScript expressions
case JSNew(ctor, args) =>
JSNew(transform(ctor), args.map(transformTreeOrJSSpread))
case JSPrivateSelect(qualifier, field) =>
JSPrivateSelect(transform(qualifier), field)
case JSSelect(qualifier, item) =>
JSSelect(transform(qualifier), transform(item))
case JSFunctionApply(fun, args) =>
JSFunctionApply(transform(fun), args.map(transformTreeOrJSSpread))
case JSMethodApply(receiver, method, args) =>
JSMethodApply(transform(receiver), transform(method),
args.map(transformTreeOrJSSpread))
case JSSuperSelect(superClass, qualifier, item) =>
JSSuperSelect(superClass, transform(qualifier), transform(item))
case JSSuperMethodCall(superClass, receiver, method, args) =>
JSSuperMethodCall(superClass, transform(receiver),
transform(method), args.map(transformTreeOrJSSpread))
case JSSuperConstructorCall(args) =>
JSSuperConstructorCall(args.map(transformTreeOrJSSpread))
case JSImportCall(arg) =>
JSImportCall(transform(arg))
case JSDelete(qualifier, item) =>
JSDelete(transform(qualifier), transform(item))
case JSUnaryOp(op, lhs) =>
JSUnaryOp(op, transform(lhs))
case JSBinaryOp(op, lhs, rhs) =>
JSBinaryOp(op, transform(lhs), transform(rhs))
case JSArrayConstr(items) =>
JSArrayConstr(items.map(transformTreeOrJSSpread))
case JSObjectConstr(fields) =>
JSObjectConstr(fields.map { field =>
(transform(field._1), transform(field._2))
})
case JSTypeOfGlobalRef(globalRef) =>
JSTypeOfGlobalRef(transform(globalRef).asInstanceOf[JSGlobalRef])
// Atomic expressions
case Closure(arrow, captureParams, params, restParam, body, captureValues) =>
Closure(arrow, captureParams, params, restParam, transform(body),
transformTrees(captureValues))
case CreateJSClass(className, captureValues) =>
CreateJSClass(className, transformTrees(captureValues))
// Transients
case Transient(value) =>
value.transform(this)
// Trees that need not be transformed
case _:Skip | _:Debugger | _:LoadModule | _:StoreModule |
_:SelectStatic | _:SelectJSNativeMember | _:LoadJSConstructor |
_:LoadJSModule | _:JSNewTarget | _:JSImportMeta |
_:Literal | _:VarRef | _:JSGlobalRef | _:LinkTimeProperty =>
tree
}
}
}
abstract class ClassTransformer extends Transformer {
def transformClassDef(tree: ClassDef): ClassDef = {
import tree._
ClassDef(name, originalName, kind, jsClassCaptures, superClass,
interfaces, transformTreeOpt(jsSuperClass), jsNativeLoadSpec,
fields.map(transformAnyFieldDef(_)),
methods.map(transformMethodDef), jsConstructor.map(transformJSConstructorDef),
jsMethodProps.map(transformJSMethodPropDef), jsNativeMembers,
topLevelExportDefs.map(transformTopLevelExportDef))(
tree.optimizerHints)(tree.pos)
}
def transformAnyFieldDef(fieldDef: AnyFieldDef): AnyFieldDef =
fieldDef
def transformMethodDef(methodDef: MethodDef): MethodDef = {
val MethodDef(flags, name, originalName, args, resultType, body) = methodDef
val newBody = transformTreeOpt(body)
MethodDef(flags, name, originalName, args, resultType, newBody)(
methodDef.optimizerHints, Unversioned)(methodDef.pos)
}
def transformJSConstructorDef(jsConstructor: JSConstructorDef): JSConstructorDef = {
val JSConstructorDef(flags, args, restParam, body) = jsConstructor
JSConstructorDef(flags, args, restParam, transformJSConstructorBody(body))(
jsConstructor.optimizerHints, Unversioned)(jsConstructor.pos)
}
def transformJSMethodPropDef(jsMethodPropDef: JSMethodPropDef): JSMethodPropDef = {
jsMethodPropDef match {
case jsMethodDef: JSMethodDef =>
transformJSMethodDef(jsMethodDef)
case JSPropertyDef(flags, name, getterBody, setterArgAndBody) =>
JSPropertyDef(
flags,
transform(name),
transformTreeOpt(getterBody),
setterArgAndBody.map { case (arg, body) =>
(arg, transform(body))
})(Unversioned)(jsMethodPropDef.pos)
}
}
def transformJSMethodDef(jsMethodDef: JSMethodDef): JSMethodDef = {
val JSMethodDef(flags, name, args, restParam, body) = jsMethodDef
JSMethodDef(flags, transform(name), args, restParam, transform(body))(
jsMethodDef.optimizerHints, Unversioned)(jsMethodDef.pos)
}
def transformJSConstructorBody(body: JSConstructorBody): JSConstructorBody = {
implicit val pos = body.pos
val newBeforeSuper = transformTrees(body.beforeSuper)
val newSuperCall = transform(body.superCall).asInstanceOf[JSSuperConstructorCall]
val newAfterSuper = transformTrees(body.afterSuper)
JSConstructorBody(newBeforeSuper, newSuperCall, newAfterSuper)
}
def transformTopLevelExportDef(
exportDef: TopLevelExportDef): TopLevelExportDef = {
implicit val pos = exportDef.pos
exportDef match {
case _:TopLevelJSClassExportDef | _:TopLevelModuleExportDef |
_:TopLevelFieldExportDef =>
exportDef
case TopLevelMethodExportDef(moduleID, methodDef) =>
TopLevelMethodExportDef(moduleID, transformJSMethodDef(methodDef))
}
}
}
/** Transformer that only transforms in the local scope.
*
* In practice, this means stopping at `Closure` boundaries: their
* `captureValues` are transformed, but not their other members.
*/
abstract class LocalScopeTransformer extends Transformer {
override def transform(tree: Tree): Tree = tree match {
case Closure(arrow, captureParams, params, restParam, body, captureValues) =>
Closure(arrow, captureParams, params, restParam, body,
transformTrees(captureValues))(tree.pos)
case _ =>
super.transform(tree)
}
}
}
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