/* Title: Pure/System/isabelle_system.scala
Author: Makarius
Isabelle system support, with basic Cygwin/Posix compatibility.
*/
package isabelle
import java.util.regex.Pattern
import java.util.Locale
import java.io.{BufferedReader, InputStreamReader, FileInputStream, File, IOException}
import scala.io.Source
import scala.util.matching.Regex
object Isabelle_System
{
val charset = "UTF-8"
val is_cygwin = System.getProperty("os.name").startsWith("Windows")
/* shell processes */
private def raw_execute(env: Map[String, String], redirect: Boolean, args: String*): Process =
{
val cmdline = new java.util.LinkedList[String]
for (s <- args) cmdline.add(s)
val proc = new ProcessBuilder(cmdline)
proc.environment.clear
for ((x, y) <- env) proc.environment.put(x, y)
proc.redirectErrorStream(redirect)
try { proc.start }
catch { case e: IOException => error(e.getMessage) }
}
private def process_output(proc: Process): (String, Int) =
{
proc.getOutputStream.close
val output = Source.fromInputStream(proc.getInputStream, charset).mkString
val rc = proc.waitFor
(output, rc)
}
}
class Isabelle_System
{
/** unique ids **/
private var id_count: BigInt = 0
def id(): String = synchronized { id_count += 1; "j" + id_count }
/** Isabelle environment **/
/* platform prefixes */
private val (platform_root, drive_prefix, shell_prefix) =
{
if (Isabelle_System.is_cygwin) {
val root = Cygwin.root() getOrElse "C:\\cygwin"
val drive = Cygwin.cygdrive() getOrElse "/cygdrive"
val shell = List(root + "\\bin\\bash", "-l")
(root, drive, shell)
}
else ("/", "", Nil)
}
/* bash environment */
private val environment: Map[String, String] =
{
import scala.collection.jcl.Conversions._
val env0 = Map(java.lang.System.getenv.toList: _*)
val isabelle =
env0.get("ISABELLE_TOOL") match {
case None | Some("") =>
val isabelle = java.lang.System.getProperty("isabelle.tool")
if (isabelle == null || isabelle == "") "isabelle"
else isabelle
case Some(isabelle) => isabelle
}
val dump = File.createTempFile("isabelle", null)
try {
val cmdline = shell_prefix ::: List(isabelle, "getenv", "-d", dump.toString)
val proc = Isabelle_System.raw_execute(env0, true, cmdline: _*)
val (output, rc) = Isabelle_System.process_output(proc)
if (rc != 0) error(output)
val entries =
for (entry <- Source.fromFile(dump).mkString split "\0" if entry != "") yield {
val i = entry.indexOf('=')
if (i <= 0) (entry -> "")
else (entry.substring(0, i) -> entry.substring(i + 1))
}
Map(entries: _*) +
("HOME" -> java.lang.System.getenv("HOME")) +
("PATH" -> java.lang.System.getenv("PATH"))
}
finally { dump.delete }
}
/* getenv */
def getenv(name: String): String =
environment.getOrElse(if (name == "HOME") "HOME_JVM" else name, "")
def getenv_strict(name: String): String =
{
val value = getenv(name)
if (value != "") value else error("Undefined environment variable: " + name)
}
override def toString = getenv("ISABELLE_HOME")
/** file path specifications **/
/* expand_path */
def expand_path(isabelle_path: String): String =
{
val result_path = new StringBuilder
def init(path: String)
{
if (path.startsWith("/")) {
result_path.clear
result_path += '/'
}
}
def append(path: String)
{
init(path)
for (p <- path.split("/") if p != "" && p != ".") {
if (p == "..") {
val result = result_path.toString
val i = result.lastIndexOf("/")
if (result == "")
result_path ++= ".."
else if (result.substring(i + 1) == "..")
result_path ++= "/.."
else if (i < 1)
result_path.length = i + 1
else
result_path.length = i
}
else {
val len = result_path.length
if (len > 0 && result_path(len - 1) != '/')
result_path += '/'
result_path ++= p
}
}
}
init(isabelle_path)
for (p <- isabelle_path.split("/")) {
if (p.startsWith("$")) append(getenv_strict(p.substring(1)))
else if (p == "~") append(getenv_strict("HOME"))
else if (p == "~~") append(getenv_strict("ISABELLE_HOME"))
else append(p)
}
result_path.toString
}
/* platform_path */
private val Cygdrive =
new Regex(Pattern.quote(drive_prefix) + "/([a-zA-Z])($|/.*)")
def platform_path(isabelle_path: String): String =
{
val result_path = new StringBuilder
val rest =
expand_path(isabelle_path) match {
case Cygdrive(drive, rest) if Isabelle_System.is_cygwin =>
result_path ++= (drive + ":" + File.separator)
rest
case path if path.startsWith("/") =>
result_path ++= platform_root
path
case path => path
}
for (p <- rest.split("/") if p != "") {
val len = result_path.length
if (len > 0 && result_path(len - 1) != File.separatorChar)
result_path += File.separatorChar
result_path ++= p
}
result_path.toString
}
def platform_file(path: String) = new File(platform_path(path))
/* isabelle_path */
private val Platform_Root = new Regex("(?i)" +
Pattern.quote(platform_root) + """(?:\\+|\z)(.*)""")
private val Drive = new Regex("""([a-zA-Z]):\\*(.*)""")
def isabelle_path(platform_path: String): String =
{
if (Isabelle_System.is_cygwin) {
platform_path.replace('/', '\\') match {
case Platform_Root(rest) => "/" + rest.replace('\\', '/')
case Drive(letter, rest) =>
drive_prefix + "/" + letter.toLowerCase(Locale.ENGLISH) +
(if (rest == "") "" else "/" + rest.replace('\\', '/'))
case path => path.replace('\\', '/')
}
}
else platform_path
}
/* source files */
private def try_file(file: File) = if (file.isFile) Some(file) else None
def source_file(path: String): Option[File] =
{
if (path.startsWith("/") || path == "")
try_file(platform_file(path))
else {
val pure_file = platform_file("~~/src/Pure/" + path)
if (pure_file.isFile) Some(pure_file)
else if (getenv("ML_SOURCES") != "")
try_file(platform_file("$ML_SOURCES/" + path))
else None
}
}
/** system tools **/
/* external processes */
def execute(redirect: Boolean, args: String*): Process =
{
val cmdline =
if (Isabelle_System.is_cygwin) List(platform_path("/bin/env")) ++ args
else args
Isabelle_System.raw_execute(environment, redirect, cmdline: _*)
}
def isabelle_tool(name: String, args: String*): (String, Int) =
{
getenv_strict("ISABELLE_TOOLS").split(":").find(dir => {
val file = platform_file(dir + "/" + name)
try { file.isFile && file.canRead && file.canExecute }
catch { case _: SecurityException => false }
}) match {
case Some(dir) =>
val proc = execute(true, (List(platform_path(dir + "/" + name)) ++ args): _*)
Isabelle_System.process_output(proc)
case None => ("Unknown Isabelle tool: " + name, 2)
}
}
/* named pipes */
def mk_fifo(): String =
{
val (result, rc) = isabelle_tool("mkfifo")
if (rc == 0) result.trim
else error(result)
}
def rm_fifo(fifo: String)
{
val (result, rc) = isabelle_tool("rmfifo", fifo)
if (rc != 0) error(result)
}
def fifo_reader(fifo: String): BufferedReader =
{
// blocks until writer is ready
val stream =
if (Isabelle_System.is_cygwin) execute(false, "cat", fifo).getInputStream
else new FileInputStream(fifo)
new BufferedReader(new InputStreamReader(stream, Isabelle_System.charset))
}
/** Isabelle resources **/
/* find logics */
def find_logics(): List[String] =
{
val ml_ident = getenv_strict("ML_IDENTIFIER")
var logics: Set[String] = Set()
for (dir <- getenv_strict("ISABELLE_PATH").split(":")) {
val files = platform_file(dir + "/" + ml_ident).listFiles()
if (files != null) {
for (file <- files if file.isFile) logics += file.getName
}
}
logics.toList.sort(_ < _)
}
/* symbols */
private def read_symbols(path: String): Iterator[String] =
{
val file = new File(platform_path(path))
if (file.isFile) Source.fromFile(file).getLines
else Iterator.empty
}
val symbols = new Symbol.Interpretation(
read_symbols("$ISABELLE_HOME/etc/symbols") ++
read_symbols("$ISABELLE_HOME_USER/etc/symbols"))
}