src/Tools/jEdit/src/jedit_resources.scala
author wenzelm
Mon Jan 09 20:47:45 2017 +0100 (2017-01-09 ago)
changeset 64856 5e9bf964510a
parent 64854 f5aa712e6250
child 64858 e31cf6eaecb8
permissions -rw-r--r--
clarified modules;
tuned;
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/*  Title:      Tools/jEdit/src/jedit_resources.scala
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    Author:     Makarius
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Resources for theories and auxiliary files, based on jEdit buffer
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content and virtual file-systems.
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*/
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package isabelle.jedit
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import isabelle._
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import java.io.{File => JFile, ByteArrayOutputStream}
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import javax.swing.text.Segment
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import scala.util.parsing.input.Reader
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import org.gjt.sp.jedit.io.{VFS, FileVFS, VFSManager}
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import org.gjt.sp.jedit.MiscUtilities
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import org.gjt.sp.jedit.{jEdit, View, Buffer}
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import org.gjt.sp.jedit.bufferio.BufferIORequest
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object JEdit_Resources
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{
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  val empty: JEdit_Resources = new JEdit_Resources(Sessions.Base.empty)
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}
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class JEdit_Resources(base: Sessions.Base) extends Resources(base)
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{
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  /* document node name */
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  def node_name(buffer: Buffer): Document.Node.Name =
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  {
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    val node = JEdit_Lib.buffer_name(buffer)
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    val theory = Thy_Header.thy_name_bootstrap(node).getOrElse("")
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    val master_dir = if (theory == "") "" else buffer.getDirectory
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    Document.Node.Name(node, master_dir, theory)
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  }
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  def node_name(path: String): Document.Node.Name =
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  {
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    val vfs = VFSManager.getVFSForPath(path)
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    val node = if (vfs.isInstanceOf[FileVFS]) MiscUtilities.resolveSymlinks(path) else path
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    val theory = Thy_Header.thy_name_bootstrap(node).getOrElse("")
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    val master_dir = if (theory == "") "" else vfs.getParentOfPath(path)
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    Document.Node.Name(node, master_dir, theory)
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  }
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  def theory_node_name(buffer: Buffer): Option[Document.Node.Name] =
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  {
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    val name = node_name(buffer)
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    if (name.is_theory) Some(name) else None
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  }
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  override def append(dir: String, source_path: Path): String =
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  {
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    val path = source_path.expand
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    if (dir == "" || path.is_absolute)
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      MiscUtilities.resolveSymlinks(File.platform_path(path))
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    else if (path.is_current) dir
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    else {
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      val vfs = VFSManager.getVFSForPath(dir)
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      if (vfs.isInstanceOf[FileVFS])
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        MiscUtilities.resolveSymlinks(
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          vfs.constructPath(dir, File.platform_path(path)))
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      else vfs.constructPath(dir, File.standard_path(path))
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    }
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  }
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  /* file content */
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  def read_file_content(node_name: Document.Node.Name): Option[String] =
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  {
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    val name = node_name.node
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    try {
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      val text =
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        if (Url.is_wellformed(name)) Url.read(Url(name))
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        else File.read(new JFile(name))
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      Some(Symbol.decode(Line.normalize(text)))
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    }
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    catch { case ERROR(_) => None }
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  }
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  def get_file_content(node_name: Document.Node.Name): Option[String] =
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    Document_Model.get(node_name) match {
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      case Some(model: Buffer_Model) => Some(JEdit_Lib.buffer_text(model.buffer))
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      case Some(model: File_Model) => Some(model.content.text)
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      case None => read_file_content(node_name)
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    }
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  override def with_thy_reader[A](name: Document.Node.Name, f: Reader[Char] => A): A =
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  {
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    GUI_Thread.now {
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      Document_Model.get(name) match {
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        case Some(model: Buffer_Model) =>
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          JEdit_Lib.buffer_lock(model.buffer) { Some(f(JEdit_Lib.buffer_reader(model.buffer))) }
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        case Some(model: File_Model) => Some(f(Scan.char_reader(model.content.text)))
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        case None => None
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      }
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    } getOrElse {
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      if (Url.is_wellformed(name.node)) f(Scan.byte_reader(Url(name.node)))
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      else {
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        val file = new JFile(name.node)
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        if (file.isFile) f(Scan.byte_reader(file))
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        else error("No such file: " + quote(file.toString))
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      }
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    }
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  }
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  private class File_Content_Output(buffer: Buffer) extends
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    ByteArrayOutputStream(buffer.getLength + 1)
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  {
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    def content(): Bytes = Bytes(this.buf, 0, this.count)
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  }
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  private class File_Content(buffer: Buffer) extends
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    BufferIORequest(null, buffer, null, VFSManager.getVFSForPath(buffer.getPath), buffer.getPath)
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  {
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    def _run() { }
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    def content(): Bytes =
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    {
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      val out = new File_Content_Output(buffer)
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      write(buffer, out)
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      out.content()
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    }
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  }
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  def make_file_content(buffer: Buffer): Bytes = (new File_Content(buffer)).content()
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  /* theory text edits */
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  override def commit(change: Session.Change)
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  {
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    if (change.syntax_changed.nonEmpty)
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      GUI_Thread.later { Document_Model.syntax_changed(change.syntax_changed) }
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    if (change.deps_changed ||
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        PIDE.options.bool("jedit_auto_resolve") && undefined_blobs(change.version.nodes).nonEmpty)
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      PIDE.deps_changed()
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  }
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}