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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Martin Odersky
*/
package scala.tools.nsc
package ast.parser
import javac._
/** An nsc sub-component.
*/
abstract class SyntaxAnalyzer extends SubComponent with Parsers with MarkupParsers with Scanners with JavaParsers with JavaScanners {
import global._
val phaseName = "parser"
def newPhase(prev: Phase): StdPhase = new ParserPhase(prev)
abstract class MemberDefTraverser extends Traverser {
def onMember(defn: MemberDef): Unit
private var depth: Int = 0
private def lower[T](body: => T): T = {
depth += 1
try body finally depth -= 1
}
def currentDepth = depth
/** Prune this tree and all trees beneath it. Can be overridden. */
def prune(md: MemberDef): Boolean = (
md.mods.isSynthetic
|| md.mods.isParamAccessor
|| nme.isConstructorName(md.name)
|| (md.name containsName nme.ANON_CLASS_NAME)
)
override def traverse(t: Tree): Unit = t match {
case md: MemberDef if prune(md) =>
case md @ PackageDef(_, stats) => traverseTrees(stats)
case md: ImplDef => onMember(md) ; lower(traverseTrees(md.impl.body))
case md: ValOrDefDef => onMember(md) ; lower(traverse(md.rhs))
case _ => super.traverse(t)
}
}
class MemberPosReporter(unit: CompilationUnit) extends MemberDefTraverser {
private var outputFn: MemberDef => String = outputForScreen
val path = unit.source.file.path
// If a single line, outputs the line; if it spans multiple lines
// outputs NN,NN with start and end lines, e.g. 15,25.
def outputPos(md: MemberDef): String = {
val pos = md.pos
val start = pos.focusStart.line
val end = pos.focusEnd.line
if (start == end) "" + start else s"$start,$end"
}
def outputForSed(md: MemberDef): String = {
val pos_s = "%-12s" format outputPos(md) + "p"
s"$pos_s $path # ${md.keyword} ${md.name}"
}
def outputForScreen(md: MemberDef): String = {
val pos_s = "%-20s" format " " * currentDepth + outputPos(md)
s"$pos_s ${md.keyword} ${md.name}"
}
def onMember(md: MemberDef) = println(outputFn(md))
// It recognizes "sed" and "anything else".
def show(style: String) {
if (style == "sed") {
outputFn = outputForSed
traverse(unit.body)
}
else {
outputFn = outputForScreen
println(path)
traverse(unit.body)
}
println("")
}
}
private def initialUnitBody(unit: CompilationUnit): Tree = {
if (unit.isJava) newJavaUnitParser(unit).parse()
else if (currentRun.parsing.incompleteHandled) newUnitParser(unit).parse()
else newUnitParser(unit).smartParse()
}
class ParserPhase(prev: Phase) extends StdPhase(prev) {
override val checkable = false
override val keepsTypeParams = false
def apply(unit: CompilationUnit) {
informProgress("parsing " + unit)
// if the body is already filled in, don't overwrite it
// otherwise compileLate is going to overwrite bodies of synthetic source files
if (unit.body == EmptyTree)
unit.body = initialUnitBody(unit)
if (settings.Yrangepos && !reporter.hasErrors)
validatePositions(unit.body)
if (settings.Ymemberpos.isSetByUser)
new MemberPosReporter(unit) show (style = settings.Ymemberpos.value)
}
}
}
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