/* Title: Pure/System/standard_system.scala
Module: PIDE
Author: Makarius
Standard system operations, with basic Cygwin/Posix compatibility.
*/
package isabelle
import java.lang.System
import java.util.regex.Pattern
import java.util.Locale
import java.net.URL
import java.io.{File => JFile}
import java.nio.charset.Charset
import scala.io.Codec
import scala.util.matching.Regex
object Standard_System
{
/* UTF-8 charset */
val charset_name: String = "UTF-8"
val charset: Charset = Charset.forName(charset_name)
def codec(): Codec = Codec(charset)
def string_bytes(s: String): Array[Byte] = s.getBytes(charset)
/* permissive UTF-8 decoding */
// see also http://en.wikipedia.org/wiki/UTF-8#Description
// overlong encodings enable byte-stuffing
def decode_permissive_utf8(text: CharSequence): String =
{
val buf = new java.lang.StringBuilder(text.length)
var code = -1
var rest = 0
def flush()
{
if (code != -1) {
if (rest == 0 && Character.isValidCodePoint(code))
buf.appendCodePoint(code)
else buf.append('\uFFFD')
code = -1
rest = 0
}
}
def init(x: Int, n: Int)
{
flush()
code = x
rest = n
}
def push(x: Int)
{
if (rest <= 0) init(x, -1)
else {
code <<= 6
code += x
rest -= 1
}
}
for (i <- 0 until text.length) {
val c = text.charAt(i)
if (c < 128) { flush(); buf.append(c) }
else if ((c & 0xC0) == 0x80) push(c & 0x3F)
else if ((c & 0xE0) == 0xC0) init(c & 0x1F, 1)
else if ((c & 0xF0) == 0xE0) init(c & 0x0F, 2)
else if ((c & 0xF8) == 0xF0) init(c & 0x07, 3)
}
flush()
buf.toString
}
private class Decode_Chars(decode: String => String,
buffer: Array[Byte], start: Int, end: Int) extends CharSequence
{
def length: Int = end - start
def charAt(i: Int): Char = (buffer(start + i).asInstanceOf[Int] & 0xFF).asInstanceOf[Char]
def subSequence(i: Int, j: Int): CharSequence =
new Decode_Chars(decode, buffer, start + i, start + j)
// toString with adhoc decoding: abuse of CharSequence interface
override def toString: String = decode(decode_permissive_utf8(this))
}
def decode_chars(decode: String => String,
buffer: Array[Byte], start: Int, end: Int): CharSequence =
{
require(0 <= start && start <= end && end <= buffer.length)
new Decode_Chars(decode, buffer, start, end)
}
/* shell processes */
def raw_execute(cwd: JFile, 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)
if (cwd != null) proc.directory(cwd)
if (env != null) {
proc.environment.clear
for ((x, y) <- env) proc.environment.put(x, y)
}
proc.redirectErrorStream(redirect)
proc.start
}
def process_output(proc: Process): (String, Int) =
{
proc.getOutputStream.close
val output = File.read(proc.getInputStream)
val rc =
try { proc.waitFor }
finally {
proc.getInputStream.close
proc.getErrorStream.close
proc.destroy
Thread.interrupted
}
(output, rc)
}
def raw_exec(cwd: JFile, env: Map[String, String], redirect: Boolean, args: String*)
: (String, Int) = process_output(raw_execute(cwd, env, redirect, args: _*))
/* cygwin_root */
def cygwin_root(): String =
{
val cygwin_root1 = System.getenv("CYGWIN_ROOT")
val cygwin_root2 = System.getProperty("cygwin.root")
val root =
if (cygwin_root1 != null && cygwin_root1 != "") cygwin_root1
else if (cygwin_root2 != null && cygwin_root2 != "") cygwin_root2
else error("Bad Cygwin installation: unknown root")
val root_file = new JFile(root)
if (!new JFile(root_file, "bin\\bash.exe").isFile ||
!new JFile(root_file, "bin\\env.exe").isFile ||
!new JFile(root_file, "bin\\tar.exe").isFile)
error("Bad Cygwin installation: " + quote(root))
root
}
}
class Standard_System
{
/* platform_root */
val platform_root = if (Platform.is_windows) Standard_System.cygwin_root() else "/"
/* jvm_path */
private val Cygdrive = new Regex("/cygdrive/([a-zA-Z])($|/.*)")
private val Named_Root = new Regex("//+([^/]*)(.*)")
def jvm_path(posix_path: String): String =
if (Platform.is_windows) {
val result_path = new StringBuilder
val rest =
posix_path match {
case Cygdrive(drive, rest) =>
result_path ++= (drive.toUpperCase(Locale.ENGLISH) + ":" + JFile.separator)
rest
case Named_Root(root, rest) =>
result_path ++= JFile.separator
result_path ++= JFile.separator
result_path ++= root
rest
case path if path.startsWith("/") =>
result_path ++= platform_root
path
case path => path
}
for (p <- space_explode('/', rest) if p != "") {
val len = result_path.length
if (len > 0 && result_path(len - 1) != JFile.separatorChar)
result_path += JFile.separatorChar
result_path ++= p
}
result_path.toString
}
else posix_path
/* posix_path */
private val Platform_Root = new Regex("(?i)" +
Pattern.quote(platform_root) + """(?:\\+|\z)(.*)""")
private val Drive = new Regex("""([a-zA-Z]):\\*(.*)""")
def posix_path(jvm_path: String): String =
if (Platform.is_windows) {
jvm_path.replace('/', '\\') match {
case Platform_Root(rest) => "/" + rest.replace('\\', '/')
case Drive(letter, rest) =>
"/cygdrive/" + letter.toLowerCase(Locale.ENGLISH) +
(if (rest == "") "" else "/" + rest.replace('\\', '/'))
case path => path.replace('\\', '/')
}
}
else jvm_path
/* JDK home of running JVM */
def this_jdk_home(): String =
{
val java_home = System.getProperty("java.home")
val home = new JFile(java_home)
val parent = home.getParent
val jdk_home =
if (home.getName == "jre" && parent != null &&
(new JFile(new JFile(parent, "bin"), "javac")).exists) parent
else java_home
posix_path(jdk_home)
}
}