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/* __ *\
** ________ ___ / / ___ __ ____ Scala.js tools **
** / __/ __// _ | / / / _ | __ / // __/ (c) 2014, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ |/_// /_\ \ http://scala-js.org/ **
** /____/\___/_/ |_/____/_/ | |__/ /____/ **
** |/____/ **
\* */
package scala.scalajs.tools.javascript
import scala.annotation.switch
import scala.scalajs.ir
import ir.Position
import ir.Position.NoPosition
object Trees {
import ir.Trees.requireValidIdent
/** AST node of JavaScript. */
abstract sealed class Tree {
val pos: Position
def show: String = {
val writer = new java.io.StringWriter
val printer = new Printers.JSTreePrinter(writer)
printer.printTree(this, isStat = true)
writer.toString()
}
}
case object EmptyTree extends Tree {
val pos = NoPosition
}
// Comments
case class DocComment(text: String)(implicit val pos: Position) extends Tree
// Identifiers and properties
sealed trait PropertyName {
def name: String
def pos: Position
}
case class Ident(name: String, originalName: Option[String])(
implicit val pos: Position) extends PropertyName {
requireValidIdent(name)
}
object Ident {
def apply(name: String)(implicit pos: Position): Ident =
new Ident(name, Some(name))
}
// Definitions
case class VarDef(name: Ident, mutable: Boolean, rhs: Tree)(implicit val pos: Position) extends Tree {
def ref(implicit pos: Position): Tree =
VarRef(name, mutable = mutable)
}
case class ParamDef(name: Ident, mutable: Boolean)(implicit val pos: Position) extends Tree {
def ref(implicit pos: Position): Tree =
VarRef(name, mutable = mutable)
}
// Control flow constructs
case class Skip()(implicit val pos: Position) extends Tree
class Block private (val stats: List[Tree])(implicit val pos: Position) extends Tree {
override def toString(): String =
stats.mkString("Block(", ",", ")")
}
object Block {
def apply(stats: List[Tree])(implicit pos: Position): Tree = {
val flattenedStats = stats flatMap {
case Skip() => Nil
case Block(subStats) => subStats
case other => other :: Nil
}
flattenedStats match {
case Nil => Skip()
case only :: Nil => only
case _ => new Block(flattenedStats)
}
}
def apply(stats: Tree*)(implicit pos: Position): Tree =
apply(stats.toList)
def unapply(block: Block): Some[List[Tree]] = Some(block.stats)
}
case class Labeled(label: Ident, body: Tree)(implicit val pos: Position) extends Tree
case class Assign(lhs: Tree, rhs: Tree)(implicit val pos: Position) extends Tree {
require(lhs match {
case _:VarRef | _:DotSelect | _:BracketSelect => true
case _ => false
}, s"Invalid lhs for Assign: $lhs")
}
case class Return(expr: Tree)(implicit val pos: Position) extends Tree
case class If(cond: Tree, thenp: Tree, elsep: Tree)(implicit val pos: Position) extends Tree
case class While(cond: Tree, body: Tree, label: Option[Ident] = None)(implicit val pos: Position) extends Tree
case class DoWhile(body: Tree, cond: Tree, label: Option[Ident] = None)(implicit val pos: Position) extends Tree
case class Try(block: Tree, errVar: Ident, handler: Tree, finalizer: Tree)(implicit val pos: Position) extends Tree
case class Throw(expr: Tree)(implicit val pos: Position) extends Tree
case class Break(label: Option[Ident] = None)(implicit val pos: Position) extends Tree
case class Continue(label: Option[Ident] = None)(implicit val pos: Position) extends Tree
case class Switch(selector: Tree, cases: List[(Tree, Tree)], default: Tree)(implicit val pos: Position) extends Tree
case class Debugger()(implicit val pos: Position) extends Tree
// Expressions
case class New(ctor: Tree, args: List[Tree])(implicit val pos: Position) extends Tree
case class DotSelect(qualifier: Tree, item: Ident)(implicit val pos: Position) extends Tree
case class BracketSelect(qualifier: Tree, item: Tree)(implicit val pos: Position) extends Tree
/** Syntactic apply.
* It is a method call if fun is a dot-select or bracket-select. It is a
* function call otherwise.
*/
case class Apply(fun: Tree, args: List[Tree])(implicit val pos: Position) extends Tree
case class Delete(prop: Tree)(implicit val pos: Position) extends Tree {
require(prop match {
case _:DotSelect | _:BracketSelect => true
case _ => false
}, s"Invalid prop for Delete: $prop")
}
/** Unary operation (always preserves pureness).
*
* Operations which do not preserve pureness are not allowed in this tree.
* These are notably ++ and --
*/
case class UnaryOp(op: String, lhs: Tree)(implicit val pos: Position) extends Tree
/** Binary operation (always preserves pureness).
*
* Operations which do not preserve pureness are not allowed in this tree.
* These are notably +=, -=, *=, /= and %=
*/
case class BinaryOp(op: String, lhs: Tree, rhs: Tree)(implicit val pos: Position) extends Tree
case class ArrayConstr(items: List[Tree])(implicit val pos: Position) extends Tree
case class ObjectConstr(fields: List[(PropertyName, Tree)])(implicit val pos: Position) extends Tree
// Literals
/** Marker for literals. Literals are always pure. */
sealed trait Literal extends Tree
case class Undefined()(implicit val pos: Position) extends Literal
case class Null()(implicit val pos: Position) extends Literal
case class BooleanLiteral(value: Boolean)(implicit val pos: Position) extends Literal
case class IntLiteral(value: Int)(implicit val pos: Position) extends Literal
case class DoubleLiteral(value: Double)(implicit val pos: Position) extends Literal
case class StringLiteral(value: String)(
implicit val pos: Position) extends Literal with PropertyName {
override def name = value
}
// Atomic expressions
case class VarRef(ident: Ident, mutable: Boolean)(implicit val pos: Position) extends Tree
case class This()(implicit val pos: Position) extends Tree
case class Function(args: List[ParamDef], body: Tree)(implicit val pos: Position) extends Tree
}
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