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/* Title: Pure/System/standard_system.scala
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Author: Makarius
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Standard system operations, with basic Cygwin/Posix compatibility.
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*/
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package isabelle
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import java.util.regex.Pattern
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import java.util.Locale
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import java.io.{BufferedWriter, OutputStreamWriter, FileOutputStream,
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BufferedInputStream, FileInputStream, BufferedReader, InputStreamReader,
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File, FileFilter, IOException}
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import scala.io.{Source, Codec}
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import scala.util.matching.Regex
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import scala.collection.mutable
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object Standard_System
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{
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val charset = "UTF-8"
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def codec(): Codec = Codec(charset)
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/* permissive UTF-8 decoding */
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// see also http://en.wikipedia.org/wiki/UTF-8#Description
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// overlong encodings enable byte-stuffing
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def decode_permissive_utf8(text: CharSequence): String =
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{
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val buf = new java.lang.StringBuilder(text.length)
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var code = -1
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var rest = 0
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def flush()
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{
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if (code != -1) {
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if (rest == 0 && Character.isValidCodePoint(code))
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buf.appendCodePoint(code)
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else buf.append('\uFFFD')
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code = -1
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rest = 0
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}
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}
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def init(x: Int, n: Int)
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{
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flush()
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code = x
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rest = n
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}
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def push(x: Int)
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{
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if (rest <= 0) init(x, -1)
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else {
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code <<= 6
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code += x
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rest -= 1
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}
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}
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for (i <- 0 until text.length) {
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val c = text.charAt(i)
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if (c < 128) { flush(); buf.append(c) }
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else if ((c & 0xC0) == 0x80) push(c & 0x3F)
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else if ((c & 0xE0) == 0xC0) init(c & 0x1F, 1)
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else if ((c & 0xF0) == 0xE0) init(c & 0x0F, 2)
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else if ((c & 0xF8) == 0xF0) init(c & 0x07, 3)
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}
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flush()
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buf.toString
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}
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/* basic file operations */
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def with_tmp_file[A](prefix: String)(body: File => A): A =
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{
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val file = File.createTempFile(prefix, null)
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try { body(file) } finally { file.delete }
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}
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def read_file(file: File): String =
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{
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val buf = new StringBuilder(file.length.toInt)
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val reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), charset))
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var c = reader.read
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while (c != -1) {
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buf.append(c.toChar)
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c = reader.read
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}
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reader.close
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buf.toString
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}
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def write_file(file: File, text: CharSequence)
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{
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val writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file), charset))
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try { writer.append(text) }
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finally { writer.close }
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}
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// FIXME handle (potentially cyclic) directory graph
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def find_files(start: File, ok: File => Boolean): List[File] =
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{
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val files = new mutable.ListBuffer[File]
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val filter = new FileFilter { def accept(entry: File) = entry.isDirectory || ok(entry) }
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def find_entry(entry: File)
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{
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if (ok(entry)) files += entry
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if (entry.isDirectory) entry.listFiles(filter).foreach(find_entry)
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}
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find_entry(start)
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files.toList
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}
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/* shell processes */
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def raw_execute(cwd: File, env: Map[String, String], redirect: Boolean, args: String*): Process =
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{
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val cmdline = new java.util.LinkedList[String]
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for (s <- args) cmdline.add(s)
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val proc = new ProcessBuilder(cmdline)
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if (cwd != null) proc.directory(cwd)
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if (env != null) {
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proc.environment.clear
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for ((x, y) <- env) proc.environment.put(x, y)
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}
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proc.redirectErrorStream(redirect)
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try { proc.start }
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catch { case e: IOException => error(e.getMessage) }
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}
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def process_output(proc: Process): (String, Int) =
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{
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proc.getOutputStream.close
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val output = Source.fromInputStream(proc.getInputStream)(codec()).mkString // FIXME
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val rc =
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try { proc.waitFor }
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finally {
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proc.getInputStream.close
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proc.getErrorStream.close
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proc.destroy
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Thread.interrupted
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}
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(output, rc)
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}
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def raw_exec(cwd: File, env: Map[String, String], redirect: Boolean, args: String*):
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(String, Int) = process_output(raw_execute(cwd, env, redirect, args: _*))
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}
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class Standard_System
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{
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val platform_root = if (Platform.is_windows) Cygwin.check_root() else "/"
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override def toString = platform_root
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/* jvm_path */
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private val Cygdrive = new Regex("/cygdrive/([a-zA-Z])($|/.*)")
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private val Named_Root = new Regex("//+([^/]*)(.*)")
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def jvm_path(posix_path: String): String =
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if (Platform.is_windows) {
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val result_path = new StringBuilder
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val rest =
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posix_path match {
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case Cygdrive(drive, rest) =>
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result_path ++= (drive + ":" + File.separator)
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rest
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case Named_Root(root, rest) =>
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result_path ++= File.separator
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result_path ++= File.separator
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result_path ++= root
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rest
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case path if path.startsWith("/") =>
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result_path ++= platform_root
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path
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case path => path
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}
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for (p <- rest.split("/") if p != "") {
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val len = result_path.length
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if (len > 0 && result_path(len - 1) != File.separatorChar)
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result_path += File.separatorChar
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result_path ++= p
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}
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result_path.toString
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}
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else posix_path
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/* posix_path */
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private val Platform_Root = new Regex("(?i)" +
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Pattern.quote(platform_root) + """(?:\\+|\z)(.*)""")
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private val Drive = new Regex("""([a-zA-Z]):\\*(.*)""")
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def posix_path(jvm_path: String): String =
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if (Platform.is_windows) {
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jvm_path.replace('/', '\\') match {
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case Platform_Root(rest) => "/" + rest.replace('\\', '/')
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case Drive(letter, rest) =>
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"/cygdrive/" + letter.toLowerCase(Locale.ENGLISH) +
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(if (rest == "") "" else "/" + rest.replace('\\', '/'))
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case path => path.replace('\\', '/')
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}
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}
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else jvm_path
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}
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