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package dotty.tools
package dotc
package reporting
import scala.collection.mutable
import util.SourcePosition
import core.Contexts._
import Reporter._
import java.io.{ BufferedReader, IOException, PrintWriter }
import scala.reflect.internal.util._
import printing.SyntaxHighlighting._
import printing.Highlighting._
import diagnostic.{ Message, MessageContainer }
import diagnostic.messages._
/**
* This class implements a more Fancy version (with colors!) of the regular
* `ConsoleReporter`
*/
class ConsoleReporter(
reader: BufferedReader = Console.in,
writer: PrintWriter = new PrintWriter(Console.err, true)
) extends Reporter with UniqueMessagePositions with HideNonSensicalMessages {
import MessageContainer._
/** maximal number of error messages to be printed */
protected def ErrorLimit = 100
/** Prints the message. */
def printMessage(msg: String): Unit = { writer.print(msg + "\n"); writer.flush() }
def stripColor(str: String): String =
str.replaceAll("\u001B\\[[;\\d]*m", "")
def sourceLine(pos: SourcePosition)(implicit ctx: Context): (String, Int) = {
val lineNum = s"${pos.line}:"
(lineNum + hl"${pos.lineContent.stripLineEnd}", lineNum.length)
}
def columnMarker(pos: SourcePosition, offset: Int)(implicit ctx: Context) =
if (pos.startLine == pos.endLine) {
val whitespace = " " * (pos.startColumn + offset)
val carets =
Red("^" * math.max(1, pos.endColumn - pos.startColumn))
whitespace + carets.show
} else {
Red(" " * (pos.column + offset) + "^").show
}
def errorMsg(pos: SourcePosition, msg: String, offset: Int)(implicit ctx: Context) = {
var hasLongLines = false
val leastWhitespace = msg.lines.foldLeft(Int.MaxValue) { (minPad, line) =>
val lineLength = stripColor(line).length
val padding =
math.min(math.max(0, ctx.settings.pageWidth.value - offset - lineLength), offset + pos.startColumn)
if (padding < minPad) padding
else minPad
}
msg
.lines
.map { line => " " * leastWhitespace + line }
.mkString(sys.props("line.separator"))
}
def posStr(pos: SourcePosition, kind: String, errorId: String)(implicit ctx: Context) =
if (pos.exists) Blue({
val file = pos.source.file.toString
val errId = if (errorId != "") s"[$errorId] " else ""
val prefix = s"-- ${errId}${kind}: $file "
prefix +
("-" * math.max(ctx.settings.pageWidth.value - stripColor(prefix).length, 0))
}).show else ""
/** Prints the message with the given position indication. */
def printMessageAndPos(msg: Message, pos: SourcePosition, kind: String)(implicit ctx: Context): Unit = {
printMessage(posStr(pos, kind, msg.errorId))
if (pos.exists) {
val (src, offset) = sourceLine(pos)
val marker = columnMarker(pos, offset)
val err = errorMsg(pos, msg.msg, offset)
printMessage(List(src, marker, err).mkString("\n"))
} else printMessage(msg.msg)
}
def printExplanation(m: Message)(implicit ctx: Context): Unit = {
printMessage(hl"""|
|${Blue("Explanation")}
|${Blue("===========")}""".stripMargin)
printMessage(m.explanation)
}
override def doReport(m: MessageContainer)(implicit ctx: Context): Unit = {
m match {
case m: Error =>
printMessageAndPos(m.contained, m.pos, m.kind)
if (ctx.settings.prompt.value) displayPrompt()
case m: ConditionalWarning if !m.enablingOption.value =>
case m: MigrationWarning =>
printMessageAndPos(m.contained, m.pos, m.kind)
case m: Warning =>
printMessageAndPos(m.contained, m.pos, m.kind)
case _ =>
printMessageAndPos(m.contained, m.pos, m.kind)
}
if (ctx.shouldExplain(m)) printExplanation(m.contained)
}
def displayPrompt(): Unit = {
writer.print("\na)bort, s)tack, r)esume: ")
writer.flush()
if (reader != null) {
val response = reader.read().asInstanceOf[Char].toLower
if (response == 'a' || response == 's') {
Thread.dumpStack()
if (response == 'a')
sys.exit(1)
}
writer.print("\n")
writer.flush()
}
}
override def flush()(implicit ctx: Context): Unit = { writer.flush() }
}
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