/* NSC -- new Scala compiler
* Copyright 2002-2007 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc.reporters
import java.io.{BufferedReader, InputStreamReader, IOException, PrintWriter}
import compat.StringBuilder
import scala.tools.nsc.util.{FakePos, Position}
/**
* This class implements a Reporter that displays messages on a text
* console.
*/
class ConsoleReporter(val settings: Settings, reader: BufferedReader, writer: PrintWriter) extends AbstractReporter {
/** Whether a short file name should be displayed before errors */
var shortname: Boolean = false
private def label(severity: Severity): String = severity match {
case ERROR => "error"
case WARNING => "warning"
case INFO => null
}
private def clabel(severity : Severity) = {
val label0 = label(severity)
if (label0 eq null) "" else label0 + ": "
}
def this(settings: Settings) =
this(settings, Console.in, new PrintWriter(Console.err, true))
/** Returns the number of errors issued totally as a string.
*
* @param severity ...
* @return ...
*/
private def getCountString(severity: Severity): String =
countElementsAsString(count(severity), label(severity))
/** Prints the message. */
def printMessage(msg: String) = writer.println(msg)
/** Prints the message with the given position indication. */
def printMessage(posIn: Position, msg: String): Unit =
if (posIn ne null) {
val pos = posIn.inUltimateSource
val buf = new StringBuilder(msg)
buf.insert(0, " ")
if (pos.line != Position.NOLINE)
buf.insert(0, ":" + pos.line + ":")
pos match {
case FakePos(msg) =>
buf.insert(0, msg)
case _ =>
val file = pos.source.file
buf.insert(0, if (shortname) file.name else file.path)
}
printMessage(buf.toString())
printSourceLine(pos)
} else
printMessage(msg)
def print(pos: Position, msg: String, severity: Severity) =
printMessage(pos, clabel(severity) + msg)
/**
* @param pos ...
*/
def printSourceLine(pos: Position) = if ((pos ne null) && pos.offset != Position.NOPOS) {
printMessage(pos.lineContent.stripLineEnd)
printColumnMarker(pos)
}
/** Prints the column marker of the given position.
*
* @param pos ...
*/
def printColumnMarker(pos: Position) = if (pos ne null) {
val buffer = new StringBuilder(pos.column)
var i = 1
while (i < pos.column) {
buffer.append(' ')
i = i + 1
}
if (pos.column > 0) buffer.append('^')
printMessage(buffer.toString())
}
/** Prints the number of errors and warnings if their are non-zero. */
def printSummary() = {
if (warnings > 0) printMessage(getCountString(WARNING) + " found")
if ( errors > 0) printMessage(getCountString(ERROR ) + " found")
}
def display(pos: Position, msg: String, severity: Severity): Unit = {
incr(severity)
print(pos, msg, severity)
}
def displayPrompt: Unit = try {
var continue = true
while (continue) {
writer.print("r)esume, a)bort: ")
writer.flush()
var line = reader.readLine()
if (line ne null) {
line = line.toLowerCase()
if ("abort".startsWith(line))
throw new Error("user abort")
if ("resume".startsWith(line)) continue = false
}
}
} catch {
case ex: IOException => {
ex.printStackTrace()
throw new Error("input read error")
}
}
}