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package dotty.tools
package dotc
package reporting
import scala.collection.mutable
import util.SourcePosition
import core.Contexts._, core.Decorators._
import Reporter._
import java.io.{ BufferedReader, IOException, PrintWriter }
import scala.reflect.internal.util._
import printing.SyntaxHighlighting._
import printing.Highlighting._
import diagnostic.{ Message, MessageContainer, NoExplanation }
import diagnostic.messages._
/**
* This class implements a Reporter that displays messages on a text console
*/
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 sourceLines(pos: SourcePosition)(implicit ctx: Context): (List[String], Int) = {
var maxLen = Int.MinValue
val lines = pos.lines
.map { lineNbr =>
val prefix = s"${lineNbr + 1} |"
maxLen = math.max(maxLen, prefix.length)
(prefix, pos.lineContent(lineNbr).stripLineEnd)
}
.map { case (prefix, line) =>
val lnum = Red(" " * math.max(0, maxLen - prefix.length) + prefix)
hl"$lnum$line"
}
(lines, maxLen)
}
def columnMarker(pos: SourcePosition, offset: Int)(implicit ctx: Context) = {
val prefix = " " * (offset - 1)
val whitespace = " " * pos.startColumn
val carets = Red {
if (pos.startLine == pos.endLine)
"^" * math.max(1, pos.endColumn - pos.startColumn)
else "^"
}
s"$prefix|$whitespace${carets.show}"
}
def errorMsg(pos: SourcePosition, msg: String, offset: Int)(implicit ctx: Context) = {
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 => " " * (offset - 1) + "|" + (" " * (leastWhitespace - offset)) + line }
.mkString(sys.props("line.separator"))
}
def posStr(pos: SourcePosition, diagnosticLevel: String, message: Message)(implicit ctx: Context) =
if (pos.exists) Blue({
val file = pos.source.file.toString
val errId =
if (message.errorId != NoExplanation.ID)
s"[E${"0" * (3 - message.errorId.toString.length) + message.errorId}] "
else ""
val kind =
if (message.kind == "") diagnosticLevel
else s"${message.kind} $diagnosticLevel"
val prefix = s"-- ${errId}${kind}: $file "
prefix +
("-" * math.max(ctx.settings.pageWidth.value - stripColor(prefix).length, 0))
}).show else ""
/** Prints the message with the given position indication. */
def printMessageAndPos(msg: Message, pos: SourcePosition, diagnosticLevel: String)(implicit ctx: Context): Unit = {
printMessage(posStr(pos, diagnosticLevel, msg))
if (pos.exists) {
val (srcLines, offset) = sourceLines(pos)
val marker = columnMarker(pos, offset)
val err = errorMsg(pos, msg.msg, offset)
printMessage((srcLines ::: marker :: err :: Nil).mkString("\n"))
} else printMessage(msg.msg)
}
def printExplanation(m: Message)(implicit ctx: Context): Unit = {
printMessage(hl"""|
|${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, "Error")
if (ctx.settings.prompt.value) displayPrompt()
case m: ConditionalWarning if !m.enablingOption.value =>
case m: FeatureWarning =>
printMessageAndPos(m.contained, m.pos, "Feature Warning")
case m: DeprecationWarning =>
printMessageAndPos(m.contained, m.pos, "Deprecation Warning")
case m: UncheckedWarning =>
printMessageAndPos(m.contained, m.pos, "Unchecked Warning")
case m: MigrationWarning =>
printMessageAndPos(m.contained, m.pos, "Migration Warning")
case m: Warning =>
printMessageAndPos(m.contained, m.pos, "Warning")
case m: Info =>
printMessageAndPos(m.contained, m.pos, "Info")
}
if (ctx.shouldExplain(m))
printExplanation(m.contained)
else if (m.contained.explanation.nonEmpty)
printMessage("\nlonger explanation available when compiling with `-explain`")
}
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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