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/* __ *\
** ________ ___ / / ___ __ ____ Scala.js IR **
** / __/ __// _ | / / / _ | __ / // __/ (c) 2014, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ |/_// /_\ \ http://scala-js.org/ **
** /____/\___/_/ |_/____/_/ | |__/ /____/ **
** |/____/ **
\* */
package scala.scalajs.ir
import Trees._
object Transformers {
abstract class Transformer {
final def transformStat(tree: Tree): Tree =
transform(tree, isStat = true)
final def transformExpr(tree: Tree): Tree =
transform(tree, isStat = false)
def transform(tree: Tree, isStat: Boolean): Tree = {
implicit val pos = tree.pos
tree match {
// Definitions
case VarDef(ident, vtpe, mutable, rhs) =>
VarDef(ident, vtpe, mutable, transformExpr(rhs))
// Control flow constructs
case Block(stats :+ expr) =>
Block(stats.map(transformStat) :+ transform(expr, isStat))
case Labeled(label, tpe, body) =>
Labeled(label, tpe, transform(body, isStat))
case Assign(lhs, rhs) =>
Assign(transformExpr(lhs), transformExpr(rhs))
case Return(expr, label) =>
Return(transformExpr(expr), label)
case If(cond, thenp, elsep) =>
If(transformExpr(cond), transform(thenp, isStat),
transform(elsep, isStat))(tree.tpe)
case While(cond, body, label) =>
While(transformExpr(cond), transformStat(body), label)
case DoWhile(body, cond, label) =>
DoWhile(transformStat(body), transformExpr(cond), label)
case Try(block, errVar, handler, finalizer) =>
Try(transform(block, isStat), errVar, transform(handler, isStat),
transformStat(finalizer))(tree.tpe)
case Throw(expr) =>
Throw(transformExpr(expr))
case Match(selector, cases, default) =>
Match(transformExpr(selector),
cases map (c => (c._1, transform(c._2, isStat))),
transform(default, isStat))(tree.tpe)
// Scala expressions
case New(cls, ctor, args) =>
New(cls, ctor, args map transformExpr)
case StoreModule(cls, value) =>
StoreModule(cls, transformExpr(value))
case Select(qualifier, item, mutable) =>
Select(transformExpr(qualifier), item, mutable)(tree.tpe)
case Apply(receiver, method, args) =>
Apply(transformExpr(receiver), method,
args map transformExpr)(tree.tpe)
case StaticApply(receiver, cls, method, args) =>
StaticApply(transformExpr(receiver), cls, method,
args map transformExpr)(tree.tpe)
case TraitImplApply(impl, method, args) =>
TraitImplApply(impl, method, args map transformExpr)(tree.tpe)
case UnaryOp(op, lhs) =>
UnaryOp(op, transformExpr(lhs))
case BinaryOp(op, lhs, rhs) =>
BinaryOp(op, transformExpr(lhs), transformExpr(rhs))
case NewArray(tpe, lengths) =>
NewArray(tpe, lengths map transformExpr)
case ArrayValue(tpe, elems) =>
ArrayValue(tpe, elems map transformExpr)
case ArrayLength(array) =>
ArrayLength(transformExpr(array))
case ArraySelect(array, index) =>
ArraySelect(transformExpr(array), transformExpr(index))(tree.tpe)
case RecordValue(tpe, elems) =>
RecordValue(tpe, elems map transformExpr)
case IsInstanceOf(expr, cls) =>
IsInstanceOf(transformExpr(expr), cls)
case AsInstanceOf(expr, cls) =>
AsInstanceOf(transformExpr(expr), cls)
case Unbox(expr, charCode) =>
Unbox(transformExpr(expr), charCode)
case GetClass(expr) =>
GetClass(transformExpr(expr))
case CallHelper(helper, args) =>
CallHelper(helper, args map transformExpr)(tree.tpe)
// JavaScript expressions
case JSNew(ctor, args) =>
JSNew(transformExpr(ctor), args map transformExpr)
case JSDotSelect(qualifier, item) =>
JSDotSelect(transformExpr(qualifier), item)
case JSBracketSelect(qualifier, item) =>
JSBracketSelect(transformExpr(qualifier), transformExpr(item))
case JSFunctionApply(fun, args) =>
JSFunctionApply(transformExpr(fun), args map transformExpr)
case JSDotMethodApply(receiver, method, args) =>
JSDotMethodApply(transformExpr(receiver), method,
args map transformExpr)
case JSBracketMethodApply(receiver, method, args) =>
JSBracketMethodApply(transformExpr(receiver), transformExpr(method),
args map transformExpr)
case JSDelete(prop) =>
JSDelete(transformExpr(prop))
case JSUnaryOp(op, lhs) =>
JSUnaryOp(op, transformExpr(lhs))
case JSBinaryOp(op, lhs, rhs) =>
JSBinaryOp(op, transformExpr(lhs), transformExpr(rhs))
case JSArrayConstr(items) =>
JSArrayConstr(items map transformExpr)
case JSObjectConstr(fields) =>
JSObjectConstr(fields map {
case (name, value) => (name, transformExpr(value))
})
// Atomic expressions
case Closure(captureParams, params, body, captureValues) =>
Closure(captureParams, params, transformExpr(body),
captureValues.map(transformExpr))
// Trees that need not be transformed
case _:Skip | _:Continue | _:LoadModule | _:JSEnvInfo |
_:Literal | _:VarRef | _:This | EmptyTree =>
tree
case _ =>
sys.error(s"Invalid tree in transform() of class ${tree.getClass}")
}
}
}
abstract class ClassTransformer extends Transformer {
def transformClassDef(tree: ClassDef): ClassDef = {
val ClassDef(name, kind, parent, ancestors, defs) = tree
ClassDef(name, kind, parent, ancestors, defs.map(transformDef))(tree.pos)
}
def transformDef(tree: Tree): Tree = {
implicit val pos = tree.pos
tree match {
case VarDef(name, vtpe, mutable, rhs) =>
VarDef(name, vtpe, mutable, transformExpr(rhs))
case MethodDef(name, args, resultType, body) =>
MethodDef(name, args, resultType, transformStat(body))(None)
case PropertyDef(name, getterBody, setterArg, setterBody) =>
PropertyDef(
name,
transformStat(getterBody),
setterArg,
transformStat(setterBody))
case ConstructorExportDef(fullName, args, body) =>
ConstructorExportDef(fullName, args, transformStat(body))
case ModuleExportDef(_) =>
tree
case _ =>
sys.error(s"Invalid tree in transformDef() of class ${tree.getClass}")
}
}
}
}
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