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package dotty.tools
package dotc
package reporting
import core.Contexts._
import util.{SourcePosition, NoSourcePosition}
import util.{SourceFile, NoSource}
import core.Decorators.PhaseListDecorator
import collection.mutable
import config.Settings.Setting
import java.lang.System.currentTimeMillis
trait Reporting { this: Context =>
def error(msg: String, pos: SourcePosition = NoSourcePosition): Unit = reporter.error(msg, pos)
def warning(msg: String, pos: SourcePosition = NoSourcePosition): Unit = reporter.warning(msg, pos)
def inform(msg: String, pos: SourcePosition = NoSourcePosition): Unit = reporter.info(msg, pos)
def log(msg: => String): Unit =
if (this.settings.log.value.containsPhase(phase))
inform(s"[log ${ctx.phasesStack.reverse.mkString(" -> ")}] $msg")
def debuglog(msg: => String): Unit =
if (ctx.debug) log(msg)
def informTime(msg: => String, start: Long): Unit =
informProgress(msg + elapsed(start))
def deprecation = reporter.deprecation
def unchecked = reporter.unchecked
def feature = reporter.feature
private def elapsed(start: Long) =
" in " + (currentTimeMillis - start) + "ms"
def informProgress(msg: => String) =
if (this.settings.verbose.value) inform("[" + msg + "]")
def trace[T](msg: => String)(value: T) = {
log(msg + " " + value)
value
}
def debugwarn(msg: String, pos: SourcePosition = NoSourcePosition): Unit =
if (this.settings.debug.value) warning(msg, pos)
def debugTraceIndented[T](question: => String)(op: => T): T =
if (this.settings.debugTrace.value) traceIndented(question)(op)
else op
def traceIndented[T](question: => String)(op: => T): T =
traceIndented[T](s"==> $question?", (res: Any) => s"<== $question = $res")(op)
def traceIndented[T](leading: => String, trailing: Any => String)(op: => T): T = {
var finalized = false
def finalize(result: Any, note: String) =
if (!finalized) {
base.indent -= 1
log(s"${base.indentTab * base.indent}${trailing(result)}$note")
finalized = true
}
try {
log(s"${base.indentTab * base.indent}$leading")
base.indent += 1
val res = op
finalize(res, "")
res
} catch {
case ex: Throwable =>
finalize("<missing>", s" (with exception $ex)")
throw ex
}
}
}
object Reporter {
object Severity extends Enumeration {
val INFO, WARNING, ERROR = Value
}
}
/**
* This interface provides methods to issue information, warning and
* error messages.
*/
abstract class Reporter(ctx: Context) {
import Reporter.Severity.{Value => Severity, _}
protected def report(msg: String, severity: Severity, pos: SourcePosition)(implicit ctx: Context): Unit
protected def isHidden(severity: Severity, pos: SourcePosition)(implicit ctx: Context) = false
val count = new mutable.HashMap[Severity, Int]() {
override def default(key: Severity) = 0
}
/** Whether very long lines can be truncated. This exists so important
* debugging information (like printing the classpath) is not rendered
* invisible due to the max message length.
*/
private var _truncationOK: Boolean = true
def truncationOK = _truncationOK
def withoutTruncating[T](body: => T): T = {
val saved = _truncationOK
_truncationOK = false
try body
finally _truncationOK = saved
}
type ErrorHandler = (String, SourcePosition, Context) => Unit
private var incompleteHandler: ErrorHandler = error(_, _)(_)
def withIncompleteHandler[T](handler: ErrorHandler)(op: => T): T = {
val saved = incompleteHandler
incompleteHandler = handler
try op
finally incompleteHandler = saved
}
def hasErrors = count(ERROR) > 0
def hasWarnings = count(WARNING) > 0
/** For sending messages that are printed only if -verbose is set */
def info(msg: String, pos: SourcePosition = NoSourcePosition)(implicit ctx: Context): Unit =
if (ctx.settings.verbose.value) info0(msg, INFO, pos)
/** For sending a message which should not be labeled as a warning/error,
* but also shouldn't require -verbose to be visible.
*/
def echo(msg: String, pos: SourcePosition = NoSourcePosition)(implicit ctx: Context): Unit =
info0(msg, INFO, pos)
def warning(msg: String, pos: SourcePosition = NoSourcePosition)(implicit ctx: Context): Unit =
if (!ctx.settings.nowarn.value)
withoutTruncating(info0(msg, WARNING, pos))
def error(msg: String, pos: SourcePosition = NoSourcePosition)(implicit ctx: Context): Unit =
withoutTruncating(info0(msg, ERROR, pos))
def incompleteInputError(msg: String, pos: SourcePosition = NoSourcePosition)(implicit ctx: Context): Unit =
incompleteHandler(msg, pos, ctx)
private def info0(msg: String, severity: Severity, pos: SourcePosition)(implicit ctx: Context): Unit = {
if (!isHidden(severity, pos)) {
count(severity) += 1
report(msg, severity, pos)
}
}
/** Returns a string meaning "n elements". */
private def countElementsAsString(n: Int, elements: String): String =
n match {
case 0 => "no " + elements + "s"
case 1 => "one " + elements
case 2 => "two " + elements + "s"
case 3 => "three " + elements + "s"
case 4 => "four " + elements + "s"
case _ => n + " " + elements + "s"
}
protected def label(severity: Severity): String = severity match {
case INFO => ""
case ERROR => "error: "
case WARNING => "warning: "
}
protected def countString(severity: Severity) = {
assert(severity != INFO)
countElementsAsString(count(severity), label(severity).dropRight(2))
}
def printSummary(implicit ctx: Context) {
if (count(WARNING) > 0) info(countString(WARNING) + " found")
if ( count(ERROR) > 0) info(countString(ERROR ) + " found")
allConditionalWarnings foreach (_.summarize)
}
def flush(): Unit = {}
def reset(): Unit = {
count.clear()
allConditionalWarnings foreach (_.clear())
}
protected val allConditionalWarnings = new mutable.ListBuffer[ConditionalWarning]
val deprecation = new ConditionalWarning("deprecation", ctx.settings.deprecation)
val unchecked = new ConditionalWarning("unchecked", ctx.settings.unchecked)
val feature = new ConditionalWarning("feature", ctx.settings.feature)
/** Collects for certain classes of warnings during this run. */
class ConditionalWarning(what: String, option: Setting[Boolean]) {
private var unreported: Int = 0
def clear() =
unreported = 0
def warning(msg: String, pos: SourcePosition = NoSourcePosition)(implicit ctx: Context) =
if (option.value) Reporter.this.warning(msg, pos)
else unreported += 1
def summarize(implicit ctx: Context) =
if (unreported > 0)
Reporter.this.warning(s"there were $unreported $what warning(s); re-run with ${option.name} for details")
allConditionalWarnings += this
}
}
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