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package dotty.tools
package dotc
package reporting
package diagnostic
import util.SourcePosition
import core.Contexts.Context
import java.util.Optional
object Message {
val nonSensicalStartTag = "<nonsensical>"
val nonSensicalEndTag = "</nonsensical>"
implicit class MessageContext(val c: Context) extends AnyVal {
def shouldExplain(msg: Message): Boolean = {
implicit val ctx: Context = c
msg.explanation match {
case "" => false
case _ => ctx.settings.explain.value
}
}
}
}
class Message(
msgFn: => String,
val pos: SourcePosition,
val level: Int,
val kind: String,
val explanation: String
) extends Exception with interfaces.Diagnostic {
import Message._
private var myMsg: String = null
private var myIsNonSensical: Boolean = false
override def position: Optional[interfaces.SourcePosition] =
if (pos.exists && pos.source.exists) Optional.of(pos) else Optional.empty()
/** The message to report */
def message: String = {
if (myMsg == null) {
myMsg = msgFn
if (myMsg.contains(nonSensicalStartTag)) {
myIsNonSensical = true
// myMsg might be composed of several d"..." invocations -> nested
// nonsensical tags possible
myMsg =
myMsg
.replaceAllLiterally(nonSensicalStartTag, "")
.replaceAllLiterally(nonSensicalEndTag, "")
}
}
myMsg
}
/** A message is non-sensical if it contains references to <nonsensical>
* tags. Such tags are inserted by the error diagnostic framework if a
* message contains references to internally generated error types. Normally
* we want to suppress error messages referring to types like this because
* they look weird and are normally follow-up errors to something that was
* diagnosed before.
*/
def isNonSensical = { message; myIsNonSensical }
override def toString = s"$getClass at $pos: $message"
override def getMessage() = message
}
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