/* Title: Pure/System/standard_system.scala
Author: Makarius
Standard system operations, with basic Cygwin/Posix compatibility.
*/
package isabelle
import java.lang.System
import java.util.zip.{ZipEntry, ZipInputStream}
import java.util.regex.Pattern
import java.util.Locale
import java.net.URL
import java.io.{BufferedWriter, OutputStreamWriter, FileOutputStream, BufferedOutputStream,
BufferedInputStream, InputStream, FileInputStream, BufferedReader, InputStreamReader,
File, FileFilter, IOException}
import java.nio.charset.Charset
import scala.io.{Source, Codec}
import scala.util.matching.Regex
import scala.collection.mutable
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
}
/* basic file operations */
def slurp(reader: BufferedReader): String =
{
val output = new StringBuilder(100)
var c = -1
while ({ c = reader.read; c != -1 }) output += c.toChar
reader.close
output.toString
}
def slurp(stream: InputStream): String =
slurp(new BufferedReader(new InputStreamReader(stream, charset)))
def read_file(file: File): String = slurp(new FileInputStream(file))
def try_read(files: Seq[File]): String =
{
val buf = new StringBuilder
for {
file <- files if file.isFile
c <- (Source.fromFile(file) ++ Iterator.single('\n'))
} buf.append(c)
buf.toString
}
def write_file(file: File, text: CharSequence)
{
val writer =
new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file), charset))
try { writer.append(text) }
finally { writer.close }
}
def with_tmp_file[A](prefix: String)(body: File => A): A =
{
val file = File.createTempFile(prefix, null)
file.deleteOnExit
try { body(file) } finally { file.delete }
}
// FIXME handle (potentially cyclic) directory graph
def find_files(start: File, ok: File => Boolean): List[File] =
{
val files = new mutable.ListBuffer[File]
val filter = new FileFilter { def accept(entry: File) = entry.isDirectory || ok(entry) }
def find_entry(entry: File)
{
if (ok(entry)) files += entry
if (entry.isDirectory) entry.listFiles(filter).foreach(find_entry)
}
find_entry(start)
files.toList
}
/* shell processes */
def raw_execute(cwd: File, 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 = slurp(proc.getInputStream)
val rc =
try { proc.waitFor }
finally {
proc.getInputStream.close
proc.getErrorStream.close
proc.destroy
Thread.interrupted
}
(output, rc)
}
def raw_exec(cwd: File, env: Map[String, String], redirect: Boolean, args: String*)
: (String, Int) = process_output(raw_execute(cwd, env, redirect, args: _*))
/* unpack zip archive -- platform file-system */
def unzip(url: URL, root: File)
{
import scala.collection.JavaConversions._
val buffer = new Array[Byte](4096)
val zip_stream = new ZipInputStream(new BufferedInputStream(url.openStream))
var entry: ZipEntry = null
try {
while ({ entry = zip_stream.getNextEntry; entry != null }) {
val file = new File(root, entry.getName.replace('/', File.separatorChar))
val dir = file.getParentFile
if (dir != null && !dir.isDirectory && !dir.mkdirs)
error("Failed to create directory: " + dir)
var len = 0
val out_stream = new BufferedOutputStream(new FileOutputStream(file))
try {
while ({ len = zip_stream.read(buffer); len != -1 })
out_stream.write(buffer, 0, len)
}
finally { out_stream.close }
}
}
finally { zip_stream.close }
}
/* unpack tar archive -- POSIX file-system */
def posix_untar(url: URL, root: File, gunzip: Boolean = false,
tar: String = "tar", gzip: String = "", progress: Int => Unit = _ => ()): String =
{
if (!root.isDirectory && !root.mkdirs)
error("Failed to create root directory: " + root)
val connection = url.openConnection
val length = connection.getContentLength.toLong
require(length >= 0L)
val stream = new BufferedInputStream(connection.getInputStream)
val progress_stream = new InputStream {
private val total = length max 1L
private var index = 0L
private var percentage = 0L
override def read(): Int =
{
val c = stream.read
if (c != -1) {
index += 100
val p = index / total
if (percentage != p) { percentage = p; progress(percentage.toInt) }
}
c
}
override def available(): Int = stream.available
override def close() { stream.close }
}
val cmdline =
List(tar, "-o", "-x", "-f-") :::
(if (!gunzip) Nil else if (gzip == "") List("-z") else List("-I", gzip))
val proc = raw_execute(root, null, false, cmdline:_*)
val stdout = Simple_Thread.future("tar_stdout") { slurp(proc.getInputStream) }
val stderr = Simple_Thread.future("tar_stderr") { slurp(proc.getErrorStream) }
val stdin = new BufferedOutputStream(proc.getOutputStream)
try {
var c = -1
val io_err =
try { while ({ c = progress_stream.read; c != -1 }) stdin.write(c); false }
catch { case e: IOException => true }
stdin.close
val rc = try { proc.waitFor } finally { Thread.interrupted }
if (io_err || rc != 0) error(stderr.join.trim) else stdout.join
}
finally {
progress_stream.close
stdin.close
proc.destroy
}
}
}
class Standard_System
{
/* platform_root */
val platform_root = if (Platform.is_windows) Cygwin.check_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 + ":" + File.separator)
rest
case Named_Root(root, rest) =>
result_path ++= File.separator
result_path ++= File.separator
result_path ++= root
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
}
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
/* this_java executable */
def this_java(): String =
{
val java_home = System.getProperty("java.home")
val java_exe =
if (Platform.is_windows) new File(java_home + "\\bin\\java.exe")
else new File(java_home + "/bin/java")
if (!java_exe.isFile) error("Expected this Java executable: " + java_exe.toString)
posix_path(java_exe.getAbsolutePath)
}
}