/*  Title:      Pure/System/platform.scala
    Author:     Makarius

Raw platform identification.
*/

package isabelle


import scala.util.matching.Regex


object Platform
{
  /* main OS variants */

  val is_linux = System.getProperty("os.name", "") == "Linux"
  val is_macos = System.getProperty("os.name", "") == "Mac OS X"
  val is_windows = System.getProperty("os.name", "").startsWith("Windows")


  /* Platform identifiers */

  private val Solaris = new Regex("SunOS|Solaris")
  private val Linux = new Regex("Linux")
  private val Darwin = new Regex("Mac OS X")
  private val Windows = new Regex("Windows.*")

  private val X86 = new Regex("i.86|x86")
  private val X86_64 = new Regex("amd64|x86_64")
  private val Sparc = new Regex("sparc")
  private val PPC = new Regex("PowerPC|ppc")

  lazy val jvm_platform: String =
  {
    val arch =
      System.getProperty("os.arch", "") match {
        case X86() => "x86"
        case X86_64() => "x86_64"
        case Sparc() => "sparc"
        case PPC() => "ppc"
        case _ => error("Failed to determine CPU architecture")
      }
    val os =
      System.getProperty("os.name", "") match {
        case Solaris() => "solaris"
        case Linux() => "linux"
        case Darwin() => "darwin"
        case Windows() => "windows"
        case _ => error("Failed to determine operating system platform")
      }
    arch + "-" + os
  }


  /* JVM version */

  private val Version = new Regex("""1\.(\d+)\.0_(\d+)""")
  lazy val jvm_version =
    System.getProperty("java.version") match {
      case Version(a, b) => a + "u" + b
      case a => a
    }


  /* JVM name */

  val jvm_name: String = System.getProperty("java.vm.name", "")
}