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package dotty.tools
package dotc
package util
import scala.collection.mutable
trait FreshNameCreator {
def newName(prefix: String = ""): String
}
object FreshNameCreator {
class Default extends FreshNameCreator {
protected var counter = 0
protected val counters = mutable.AnyRefMap[String, Int]() withDefaultValue 0
/**
* Create a fresh name with the given prefix. It is guaranteed
* that the returned name has never been returned by a previous
* call to this function (provided the prefix does not end in a digit).
*/
def newName(prefix: String): String = {
val safePrefix = prefix.replaceAll("""[<>]""", """\$""")
counters(safePrefix) += 1
val counter = counters(safePrefix)
if (prefix.isEmpty) "$" + counter + "$" else safePrefix + counter
}
}
}
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