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/* NSC -- new Scala compiler
* Copyright 2005-2009 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc.ast
import compat.Platform.{EOL => LINE_SEPARATOR}
import java.io.{OutputStream, PrintWriter, Writer}
import symtab.Flags._
import symtab.SymbolTable
abstract class TreePrinters {
val trees: SymbolTable
import trees._
final val showOuterTests = false
class TreePrinter(out: PrintWriter) {
protected var indentMargin = 0
protected val indentStep = 2
protected var indentString = " " // 40
def flush() = out.flush()
def indent = indentMargin += indentStep
def undent = indentMargin -= indentStep
def println {
out.println()
while (indentMargin > indentString.length())
indentString += indentString
if (indentMargin > 0)
out.write(indentString, 0, indentMargin)
}
def printSeq[a](ls: List[a])(printelem: a => Unit)(printsep: => Unit) {
ls match {
case List() =>
case List(x) => printelem(x)
case x :: rest => printelem(x); printsep; printSeq(rest)(printelem)(printsep)
}
}
def printColumn(ts: List[Tree], start: String, sep: String, end: String) {
print(start); indent; println
printSeq(ts){print}{print(sep); println}; undent; println; print(end)
}
def printRow(ts: List[Tree], start: String, sep: String, end: String) {
print(start); printSeq(ts){print}{print(sep)}; print(end)
}
def printRow(ts: List[Tree], sep: String) { printRow(ts, "", sep, "") }
def printTypeParams(ts: List[TypeDef]) {
if (!ts.isEmpty) {
print("["); printSeq(ts){ t =>
printAnnotations(t)
printParam(t)
}{print(", ")}; print("]")
}
}
def printValueParams(ts: List[ValDef]) {
print("(")
if (!ts.isEmpty) printFlags(ts.head.mods.flags & IMPLICIT, "")
printSeq(ts){printParam}{print(", ")}
print(")")
}
def printParam(tree: Tree) {
tree match {
case ValDef(mods, name, tp, rhs) =>
if (settings.Xprintpos.value) print(tree.pos.show)
printAnnotations(tree)
print(symName(tree, name)); printOpt(": ", tp); printOpt(" = ", rhs)
case TypeDef(mods, name, tparams, rhs) =>
if (settings.Xprintpos.value) print(tree.pos.show)
print(symName(tree, name))
printTypeParams(tparams); print(rhs)
}
}
def printBlock(tree: Tree) {
tree match {
case Block(_, _) =>
print(tree)
case _ =>
printColumn(List(tree), "{", ";", "}")
}
}
def symName(tree: Tree, name: Name): String =
if (tree.symbol != null && tree.symbol != NoSymbol) {
((if (tree.symbol.isMixinConstructor) "/*"+tree.symbol.owner.name+"*/" else "") +
tree.symbol.nameString)
} else name.toString();
def printOpt(prefix: String, tree: Tree) {
if (!tree.isEmpty) { print(prefix); print(tree) }
}
def printModifiers(tree: Tree, mods: Modifiers) {
if (tree.symbol == NoSymbol)
printFlags(mods.flags, mods.privateWithin.toString)
else if (tree.symbol.privateWithin == NoSymbol ||
tree.symbol.privateWithin == tree.symbol.owner)
printFlags(tree.symbol.flags, "")
else
printFlags(tree.symbol.flags, tree.symbol.privateWithin.name.toString)
}
def printFlags(flags: Long, privateWithin: String) {
var mask: Long = if (settings.debug.value) -1L else PrintableFlags
val s = flagsToString(flags & mask, privateWithin)
if (s.length() != 0) print(s + " ")
}
def printAnnotations(tree: Tree) {
if (!tree.symbol.rawAnnotations.isEmpty) {
val annots = tree.symbol.annotations
if (!annots.isEmpty) {
annots foreach { annot => print("@"+annot+" ") }
println
}
} else {
val annots = tree.asInstanceOf[MemberDef].mods.annotations
if (!annots.isEmpty) {
annots foreach { annot => print("@"+annot+" ") }
println
}
}
}
def print(str: String) { out.print(str) }
def print(name: Name) { print(name.toString()) }
private var currentOwner: Symbol = NoSymbol
private var selectorType: Type = NoType
def printRaw(tree: Tree) {
tree match {
case EmptyTree =>
print("<empty>")
case ClassDef(mods, name, tparams, impl) =>
printAnnotations(tree)
printModifiers(tree, mods)
print((if (mods.isTrait) "trait " else "class ") + symName(tree, name))
printTypeParams(tparams)
print(if (mods hasFlag DEFERRED) " <: " else " extends "); print(impl) // (part of DEVIRTUALIZE)
case PackageDef(packaged, stats) =>
printAnnotations(tree)
print("package "); print(packaged); printColumn(stats, " {", ";", "}")
case ModuleDef(mods, name, impl) =>
printAnnotations(tree)
printModifiers(tree, mods); print("object " + symName(tree, name))
print(" extends "); print(impl)
case ValDef(mods, name, tp, rhs) =>
printAnnotations(tree)
printModifiers(tree, mods)
print(if (mods.hasFlag(MUTABLE)) "var " else "val ")
print(symName(tree, name))
printOpt(": ", tp)
if (!mods.hasFlag(DEFERRED)) {
print(" = ")
if (rhs.isEmpty) print("_") else print(rhs)
}
case DefDef(mods, name, tparams, vparamss, tp, rhs) =>
printAnnotations(tree)
printModifiers(tree, mods)
print("def " + symName(tree, name))
printTypeParams(tparams); vparamss foreach printValueParams
printOpt(": ", tp); printOpt(" = ", rhs)
case TypeDef(mods, name, tparams, rhs) =>
if (mods hasFlag (PARAM | DEFERRED)) {
printAnnotations(tree)
printModifiers(tree, mods); print("type "); printParam(tree)
} else {
printAnnotations(tree)
printModifiers(tree, mods); print("type " + symName(tree, name))
printTypeParams(tparams); printOpt(" = ", rhs)
}
case LabelDef(name, params, rhs) =>
print(symName(tree, name)); printRow(params, "(", ",", ")"); printBlock(rhs)
case Import(expr, selectors) =>
// Is this selector remapping a name (i.e, {name1 => name2})
def isNotRemap(s: (Name, Name)) : Boolean = (s._1 == nme.WILDCARD || s._1 == s._2)
def selectorToString(s: (Name, Name)): String =
if (isNotRemap(s)) s._1.toString else s._1.toString + "=>" + s._2.toString
print("import "); print(expr)
print(".")
selectors match {
case List(s) =>
// If there is just one selector and it is not remapping a name, no braces are needed
if (isNotRemap(s)) {
print(selectorToString(s))
} else {
print("{"); print(selectorToString(s)); print("}")
}
// If there is more than one selector braces are always needed
case many =>
print(many.map(selectorToString).mkString("{", ", ", "}"))
}
case DocDef(comment, definition) =>
print(comment); println; print(definition)
case Template(parents, self, body) =>
val currentOwner1 = currentOwner
if (tree.symbol != NoSymbol) currentOwner = tree.symbol.owner
printRow(parents, " with ")
if (!body.isEmpty) {
if (self.name != nme.WILDCARD) {
print(" { "); print(self.name); printOpt(": ", self.tpt); print(" => ")
} else if (!self.tpt.isEmpty) {
print(" { _ : "); print(self.tpt); print(" => ")
} else {
print(" {")
}
printColumn(body, "", ";", "}")
}
currentOwner = currentOwner1
case Block(stats, expr) =>
printColumn(stats ::: List(expr), "{", ";", "}")
case Match(selector, cases) =>
val selectorType1 = selectorType
selectorType = selector.tpe
print(selector); printColumn(cases, " match {", "", "}")
selectorType = selectorType1
case CaseDef(pat, guard, body) =>
print("case ")
def patConstr(pat: Tree): Tree = pat match {
case Apply(fn, args) => patConstr(fn)
case _ => pat
}
if (showOuterTests &&
needsOuterTest(
patConstr(pat).tpe.finalResultType, selectorType, currentOwner))
print("???")
print(pat); printOpt(" if ", guard)
print(" => "); print(body)
case Sequence(trees) =>
printRow(trees, "[", ", ", "]")
case Alternative(trees) =>
printRow(trees, "(", "| ", ")")
case Star(elem) =>
print("("); print(elem); print(")*")
case Bind(name, t) =>
print("("); print(symName(tree, name)); print(" @ "); print(t); print(")")
case UnApply(fun, args) =>
print(fun); print(" <unapply> "); printRow(args, "(", ", ", ")")
case ArrayValue(elemtpt, trees) =>
print("Array["); print(elemtpt); printRow(trees, "]{", ", ", "}")
case Function(vparams, body) =>
print("("); printValueParams(vparams); print(" => "); print(body); print(")")
case Assign(lhs, rhs) =>
print(lhs); print(" = "); print(rhs)
case AssignOrNamedArg(lhs, rhs) =>
print(lhs); print(" = "); print(rhs)
case If(cond, thenp, elsep) =>
print("if ("); print(cond); print(")"); indent; println
print(thenp); undent
if (!elsep.isEmpty) {
println; print("else"); indent; println; print(elsep); undent
}
case Return(expr) =>
print("return "); print(expr)
case Try(block, catches, finalizer) =>
print("try "); printBlock(block)
if (!catches.isEmpty) printColumn(catches, " catch {", "", "}")
printOpt(" finally ", finalizer)
case Throw(expr) =>
print("throw "); print(expr)
case New(tpe) =>
print("new "); print(tpe)
case Typed(expr, tp) =>
print("("); print(expr); print(": "); print(tp); print(")")
case TypeApply(fun, targs) =>
print(fun); printRow(targs, "[", ", ", "]")
case Apply(fun, vargs) =>
print(fun); printRow(vargs, "(", ", ", ")")
case ApplyDynamic(qual, vargs) =>
print("<apply-dynamic>("); print(qual); print("#"); print(tree.symbol.nameString)
printRow(vargs, ", (", ", ", "))")
case Super(qual, mix) =>
if (!qual.isEmpty || tree.symbol != NoSymbol) print(symName(tree, qual) + ".")
print("super")
if (!mix.isEmpty)
print("[" + mix + "]")
case This(qual) =>
if (!qual.isEmpty) print(symName(tree, qual) + ".")
print("this")
case Select(qual @ New(tpe), name) if (!settings.debug.value) =>
print(qual)
case Select(qualifier, name) =>
print(qualifier); print("."); print(symName(tree, name))
case Ident(name) =>
print(symName(tree, name))
case Literal(x) =>
print(x.escapedStringValue)
case tt: TypeTree =>
if (tree.tpe eq null) {
if (tt.original != null) { print("<type: "); print(tt.original); print(">") }
else print("<type ?>")
} else if ((tree.tpe.typeSymbol ne null) && tree.tpe.typeSymbol.isAnonymousClass) {
print(tree.tpe.typeSymbol.toString())
} else {
print(tree.tpe.toString())
}
case Annotated(Apply(Select(New(tpt), nme.CONSTRUCTOR), args), tree) =>
def printAnnot() {
print("@"); print(tpt)
if (!args.isEmpty)
printRow(args, "(", ",", ")")
}
if (tree.isType) { print(tree); print(" "); printAnnot() }
else { print(tree); print(": "); printAnnot() }
case SingletonTypeTree(ref) =>
print(ref); print(".type")
case SelectFromTypeTree(qualifier, selector) =>
print(qualifier); print("#"); print(symName(tree, selector))
case CompoundTypeTree(templ) =>
print(templ)
case AppliedTypeTree(tp, args) =>
print(tp); printRow(args, "[", ", ", "]")
case TypeBoundsTree(lo, hi) =>
printOpt(" >: ", lo); printOpt(" <: ", hi)
case ExistentialTypeTree(tpt, whereClauses) =>
print(tpt);
printColumn(whereClauses, " forSome { ", ";", "}")
case tree: StubTree =>
print(tree.toString)
case tree =>
print("<unknown tree of class "+tree.getClass+">")
}
if (settings.printtypes.value && tree.isTerm && !tree.isEmpty) {
print("{"); print(if (tree.tpe eq null) "<null>" else tree.tpe.toString()); print("}")
}
}
def print(tree: Tree) {
if (settings.Xprintpos.value) print(tree.pos.show)
printRaw(
if (tree.isDef && tree.symbol != NoSymbol && tree.symbol.isInitialized) {
tree match {
case ClassDef(_, _, _, impl @ Template(ps, trees.emptyValDef, body))
if (tree.symbol.thisSym != tree.symbol) =>
ClassDef(tree.symbol, Template(ps, ValDef(tree.symbol.thisSym), body))
case ClassDef(_, _, _, impl) => ClassDef(tree.symbol, impl)
case ModuleDef(_, _, impl) => ModuleDef(tree.symbol, impl)
case ValDef(_, _, _, rhs) => ValDef(tree.symbol, rhs)
case DefDef(_, _, _, vparamss, _, rhs) => DefDef(tree.symbol, vparamss, rhs)
case TypeDef(_, _, _, rhs) => TypeDef(tree.symbol, rhs)
case _ => tree
}
} else tree)
}
def print(unit: CompilationUnit) {
print("// Scala source: " + unit.source + LINE_SEPARATOR)
if (unit.body ne null) {
print(unit.body); println
} else {
print("<null>")
}
println; flush
}
}
def create(writer: PrintWriter): TreePrinter = new TreePrinter(writer)
def create(stream: OutputStream): TreePrinter = create(new PrintWriter(stream))
def create(): TreePrinter = {
create(new PrintWriter(ConsoleWriter))
}
/** A writer that writes to the current Console and
* is sensitive to replacement of the Console's
* output stream.
*/
object ConsoleWriter extends Writer {
override def write(str: String) { Console.print(str) }
def write(cbuf: Array[Char], off: Int, len: Int) {
val str = new String(cbuf, off, len)
write(str)
}
def close = { /* do nothing */ }
def flush = { /* do nothing */ }
}
}
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