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Compiler for the Scala Programming Language
/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools.nsc
package interpreter
import scala.tools.jline.console.completer.ArgumentCompleter.{ ArgumentDelimiter, ArgumentList }
import util.returning
/** One instance of a command buffer.
*/
class Parsed private (
val buffer: String,
val cursor: Int,
val delimited: Char => Boolean
) extends Delimited {
def isEmpty = args.isEmpty
def isUnqualified = args.size == 1
def isQualified = args.size > 1
def isAtStart = cursor <= 0
private var _verbosity = 0
def verbosity = _verbosity
def withVerbosity(v: Int): this.type = returning[this.type](this)(_ => _verbosity = v)
def args = toArgs(buffer take cursor).toList
def bufferHead = args.head
def headLength = bufferHead.length + 1
def bufferTail = new Parsed(buffer drop headLength, cursor - headLength, delimited) withVerbosity verbosity
def prev = new Parsed(buffer, cursor - 1, delimited) withVerbosity verbosity
def next = new Parsed(buffer, cursor + 1, delimited) withVerbosity verbosity
def currentChar = buffer(cursor)
def currentArg = args.last
def position =
if (isEmpty) 0
else if (isLastDelimiter) cursor
else cursor - currentArg.length
def isFirstDelimiter = !isEmpty && isDelimiterChar(buffer.head)
def isLastDelimiter = !isEmpty && isDelimiterChar(buffer.last)
def firstIfDelimiter = if (isFirstDelimiter) buffer.head.toString else ""
def lastIfDelimiter = if (isLastDelimiter) buffer.last.toString else ""
def isQuoted = false // TODO
def isEscaped = !isAtStart && isEscapeChar(currentChar) && !isEscapeChar(prev.currentChar)
def isDelimiter = !isQuoted && !isEscaped && isDelimiterChar(currentChar)
override def toString = "Parsed(%s / %d)".format(buffer, cursor)
}
object Parsed {
val DefaultDelimiters = "[]{},`; \t".toSet
private def onull(s: String) = if (s == null) "" else s
def apply(s: String): Parsed = apply(onull(s), onull(s).length)
def apply(s: String, cursor: Int): Parsed = apply(onull(s), cursor, DefaultDelimiters)
def apply(s: String, cursor: Int, delimited: Char => Boolean): Parsed =
new Parsed(onull(s), cursor, delimited)
def dotted(s: String): Parsed = dotted(onull(s), onull(s).length)
def dotted(s: String, cursor: Int): Parsed = new Parsed(onull(s), cursor, _ == '.')
def undelimited(s: String, cursor: Int): Parsed = new Parsed(onull(s), cursor, _ => false)
}