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-rw-r--r--src/compiler/scala/tools/nsc/util/CommandLineParser.scala145
1 files changed, 145 insertions, 0 deletions
diff --git a/src/compiler/scala/tools/nsc/util/CommandLineParser.scala b/src/compiler/scala/tools/nsc/util/CommandLineParser.scala
new file mode 100644
index 0000000000..16d79d5776
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+++ b/src/compiler/scala/tools/nsc/util/CommandLineParser.scala
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+/* NEST (New Scala Test)
+ * Copyright 2007-2010 LAMP/EPFL
+ * @author Paul Phillips
+ */
+
+package scala.tools.nsc
+package util
+
+import scala.util.parsing.combinator._
+import scala.util.parsing.input.{ Reader }
+import scala.util.parsing.input.CharArrayReader.EofCh
+import scala.collection.mutable.ListBuffer
+
+/** A simple command line parser to replace the several different
+ * simple ones spread around trunk.
+ *
+ * XXX Note this has been completely obsolesced by scala.tools.cmd.
+ * I checked it back in as part of rolling partest back a month
+ * rather than go down the rabbit hole of unravelling dependencies.
+ */
+
+trait ParserUtil extends Parsers {
+ class ParserPlus[+T](underlying: Parser[T]) {
+ def !~>[U](p: => Parser[U]): Parser[U] = (underlying ~! p) ^^ { case a~b => b }
+ def <~![U](p: => Parser[U]): Parser[T] = (underlying ~! p) ^^ { case a~b => a }
+ }
+ protected implicit def parser2parserPlus[T](p: Parser[T]): ParserPlus[T] = new ParserPlus(p)
+}
+
+case class CommandLine(
+ args: List[String],
+ unaryArguments: List[String],
+ binaryArguments: List[String]
+) {
+ def this(args: List[String]) = this(args, Nil, Nil)
+ def this(args: Array[String]) = this(args.toList, Nil, Nil)
+ def this(line: String) = this(CommandLineParser tokenize line, Nil, Nil)
+
+ def withUnaryArgs(xs: List[String]) = copy(unaryArguments = xs)
+ def withBinaryArgs(xs: List[String]) = copy(binaryArguments = xs)
+
+ def originalArgs = args
+ def assumeBinary = true
+ def enforceArity = true
+ def onlyKnownOptions = false
+
+ val Terminator = "--"
+ val ValueForUnaryOption = "true" // so if --opt is given, x(--opt) = true
+
+ def mapForUnary(opt: String) = Map(opt -> ValueForUnaryOption)
+ def errorFn(msg: String) = println(msg)
+
+ /** argMap is option -> argument (or "" if it is a unary argument)
+ * residualArgs are what is left after removing the options and their args.
+ */
+ lazy val (argMap, residualArgs) = {
+ val residualBuffer = new ListBuffer[String]
+
+ def stripQuotes(s: String) = {
+ def isQuotedBy(c: Char) = s.length > 0 && s.head == c && s.last == c
+ if (List('"', '\'') exists isQuotedBy) s.tail.init else s
+ }
+
+ def isValidOption(s: String) = !onlyKnownOptions || (unaryArguments contains s) || (binaryArguments contains s)
+ def isOption(s: String) = (s startsWith "-") && (isValidOption(s) || { unknownOption(s) ; false })
+ def isUnary(s: String) = isOption(s) && (unaryArguments contains s)
+ def isBinary(s: String) = isOption(s) && !isUnary(s) && (assumeBinary || (binaryArguments contains s))
+
+ def unknownOption(opt: String) =
+ errorFn("Option '%s' not recognized.".format(opt))
+ def missingArg(opt: String, what: String) =
+ errorFn("Option '%s' requires argument, found %s instead.".format(opt, what))
+
+ def loop(args: List[String]): Map[String, String] = {
+ def residual(xs: List[String]) = { residualBuffer ++= xs ; Map[String, String]() }
+ if (args.isEmpty) return Map()
+ val hd :: rest = args
+ if (rest.isEmpty) {
+ if (isBinary(hd) && enforceArity)
+ missingArg(hd, "EOF")
+
+ if (isOption(hd)) mapForUnary(hd) else residual(args)
+ }
+ else
+ if (hd == Terminator) residual(rest)
+ else {
+ val hd1 :: hd2 :: rest = args
+
+ if (hd2 == Terminator) mapForUnary(hd1) ++ residual(rest)
+ else if (isUnary(hd1)) mapForUnary(hd1) ++ loop(hd2 :: rest)
+ else if (isBinary(hd1)) {
+ // Disabling this check so
+ // --scalacopts "-verbose" works. We can't tell if it's quoted,
+ // the shell does us in.
+ //
+ // if (isOption(hd2) && enforceArity)
+ // missingArg(hd1, hd2)
+
+ Map(hd1 -> hd2) ++ loop(rest)
+ }
+ else { residual(List(hd1)) ++ loop(hd2 :: rest) }
+ }
+ }
+
+ (loop(args), residualBuffer map stripQuotes toList)
+ }
+
+ def isSet(arg: String) = args contains arg
+ def get(arg: String) = argMap get arg
+ def getOrElse(arg: String, orElse: => String) = if (isSet(arg)) apply(arg) else orElse
+ def apply(arg: String) = argMap(arg)
+
+ override def toString() = "CommandLine(\n%s)\n" format (args map (" " + _ + "\n") mkString)
+}
+
+object CommandLineParser extends RegexParsers with ParserUtil {
+ override def skipWhitespace = false
+
+ def elemExcept(xs: Elem*): Parser[Elem] = elem("elemExcept", x => x != EofCh && !(xs contains x))
+ def elemOf(xs: Elem*): Parser[Elem] = elem("elemOf", xs contains _)
+ def escaped(ch: Char): Parser[String] = "\\" + ch
+ def mkQuoted(ch: Char): Parser[String] = (
+ elem(ch) !~> rep(escaped(ch) | elemExcept(ch)) <~ ch ^^ (_.mkString)
+ | failure("Unmatched %s in input." format ch)
+ )
+
+ /** Apparently windows can't deal with the quotes sticking around. */
+ lazy val squoted: Parser[String] = mkQuoted('\'') // ^^ (x => "'%s'" format x)
+ lazy val dquoted: Parser[String] = mkQuoted('"') // ^^ (x => "\"" + x + "\"")
+ lazy val token: Parser[String] = """\S+""".r
+
+ lazy val argument: Parser[String] = squoted | dquoted | token
+ lazy val commandLine: Parser[List[String]] = phrase(repsep(argument, whiteSpace))
+
+ class ParseException(msg: String) extends RuntimeException(msg)
+
+ def tokenize(line: String): List[String] = tokenize(line, x => throw new ParseException(x))
+ def tokenize(line: String, errorFn: String => Unit): List[String] = {
+ parse(commandLine, line.trim) match {
+ case Success(args, _) => args
+ case NoSuccess(msg, rest) => errorFn(msg) ; Nil
+ }
+ }
+ def apply(line: String) = new CommandLine(tokenize(line))
+}