// See LICENSE.SiFive for license details.

package freechips.rocketchip

import chisel3.internal.sourceinfo.{SourceInfo, SourceLine, UnlocatableSourceInfo}
import freechips.rocketchip.config.Parameters

package object diplomacy
{
  def sourceLine(sourceInfo: SourceInfo, prefix: String = " (", suffix: String = ")") = sourceInfo match {
    case SourceLine(filename, line, col) => s"$prefix$filename:$line:$col$suffix"
    case _ => ""
  }

  def bitIndexes(x: BigInt, tail: Seq[Int] = Nil): Seq[Int] = {
    require (x >= 0)
    if (x == 0) {
      tail.reverse
    } else {
      val lowest = x.lowestSetBit
      bitIndexes(x.clearBit(lowest), lowest +: tail)
    }
  }

  def LeftStar[T](body: Parameters => T)(implicit p: Parameters) = body(p.alterPartial {
    case CardinalityInferenceDirectionKey => CardinalityInferenceDirection.SINK_TO_SOURCE
  })
  def RightStar[T](body: Parameters => T)(implicit p: Parameters) = body(p.alterPartial {
    case CardinalityInferenceDirectionKey => CardinalityInferenceDirection.SOURCE_TO_SINK
  })
  def NoStar[T](body: Parameters => T)(implicit p: Parameters) = body(p.alterPartial {
    case CardinalityInferenceDirectionKey => CardinalityInferenceDirection.NO_INFERENCE
  })
  def FlipStar[T](body: Parameters => T)(implicit p: Parameters) = body(p.alterPartial {
    case CardinalityInferenceDirectionKey => p(CardinalityInferenceDirectionKey).flip
  })
}