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package dotty.tools
package dotc
package core
package pickling
import util.Positions._
import collection.mutable
import TastyBuffer.Addr
object PositionUnpickler {
type AddrToPosition = mutable.HashMap[Addr, Position]
}
/** Unpickler for tree positions */
class PositionUnpickler(reader: TastyReader) {
import PositionUnpickler._
import reader._
def unpickle(): (Position, AddrToPosition) = {
val positions = new mutable.HashMap[Addr, Position] // Dotty deviation: Can't use new AddrToPosition here. TODO: fix this!
val sourceLength = readNat()
def readDelta() = if (isAtEnd) 0 else readInt()
var curIndex: Addr = Addr(readDelta())
while (!isAtEnd) {
val delta1 = readDelta()
val delta2 = readDelta()
val (startDelta, endDelta, indexDelta) =
if (delta2 <= 0) (delta1, -delta2, readDelta())
else if (delta1 < 0) (0, -delta1, delta2)
else (delta1, 0, delta2)
positions(curIndex) = Position(startDelta, endDelta, startDelta)
// make non-synthetic position; will be made synthetic by normalization.
curIndex += indexDelta
}
(Position(0, sourceLength), positions)
}
}
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