src/Tools/jEdit/src/jedit_resources.scala

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Tools/jEdit/src/jedit_resources.scala	Tue Mar 18 17:39:03 2014 +0100
@@ -0,0 +1,123 @@
+/*  Title:      Tools/jEdit/src/jedit_resources.scala
+    Author:     Makarius
+
+Resources for theories and auxiliary files, based on jEdit buffer
+content and virtual file-systems.
+*/
+
+package isabelle.jedit
+
+
+import isabelle._
+
+import java.io.{File => JFile, IOException, ByteArrayOutputStream}
+import javax.swing.text.Segment
+
+import org.gjt.sp.jedit.io.{VFS, FileVFS, VFSFile, VFSManager}
+import org.gjt.sp.jedit.MiscUtilities
+import org.gjt.sp.jedit.{jEdit, View, Buffer}
+import org.gjt.sp.jedit.bufferio.BufferIORequest
+
+
+class JEdit_Resources(loaded_theories: Set[String] = Set.empty, base_syntax: Outer_Syntax)
+  extends Resources(loaded_theories, base_syntax)
+{
+  /* document node names */
+
+  def node_name(buffer: Buffer): Document.Node.Name =
+  {
+    val node = JEdit_Lib.buffer_name(buffer)
+    val theory = Thy_Header.thy_name(node).getOrElse("")
+    val master_dir = if (theory == "") "" else buffer.getDirectory
+    Document.Node.Name(node, master_dir, theory)
+  }
+
+  def theory_node_name(buffer: Buffer): Option[Document.Node.Name] =
+  {
+    val name = node_name(buffer)
+    if (name.is_theory) Some(name) else None
+  }
+
+
+  /* file-system operations */
+
+  override def append(dir: String, source_path: Path): String =
+  {
+    val path = source_path.expand
+    if (dir == "" || path.is_absolute) Isabelle_System.platform_path(path)
+    else {
+      val vfs = VFSManager.getVFSForPath(dir)
+      if (vfs.isInstanceOf[FileVFS])
+        MiscUtilities.resolveSymlinks(
+          vfs.constructPath(dir, Isabelle_System.platform_path(path)))
+      else vfs.constructPath(dir, Isabelle_System.standard_path(path))
+    }
+  }
+
+  override def with_thy_text[A](name: Document.Node.Name, f: CharSequence => A): A =
+  {
+    Swing_Thread.now {
+      JEdit_Lib.jedit_buffer(name.node) match {
+        case Some(buffer) =>
+          JEdit_Lib.buffer_lock(buffer) {
+            Some(f(buffer.getSegment(0, buffer.getLength)))
+          }
+        case None => None
+      }
+    } getOrElse {
+      val file = new JFile(name.node)  // FIXME load URL via jEdit VFS (!?)
+      if (!file.exists || !file.isFile) error("No such file: " + quote(file.toString))
+      f(File.read(file))
+    }
+  }
+
+  def check_file(view: View, path: String): Boolean =
+  {
+    val vfs = VFSManager.getVFSForPath(path)
+    val session = vfs.createVFSSession(path, view)
+
+    try {
+      session != null && {
+        try {
+          val file = vfs._getFile(session, path, view)
+          file != null && file.isReadable && file.getType == VFSFile.FILE
+        }
+        catch { case _: IOException => false }
+      }
+    }
+    finally {
+      try { vfs._endVFSSession(session, view) }
+      catch { case _: IOException => }
+    }
+  }
+
+
+  /* file content */
+
+  def file_content(buffer: Buffer): Bytes =
+  {
+    val path = buffer.getPath
+    val vfs = VFSManager.getVFSForPath(path)
+    val content =
+      new BufferIORequest(null, buffer, null, vfs, path) {
+        def _run() { }
+        def apply(): Bytes =
+        {
+          val out =
+            new ByteArrayOutputStream(buffer.getLength + 1) {
+              def content(): Bytes = Bytes(this.buf, 0, this.count)
+            }
+          write(buffer, out)
+          out.content()
+        }
+      }
+    content()
+  }
+
+
+  /* theory text edits */
+
+  override def syntax_changed(): Unit =
+    Swing_Thread.later { jEdit.propertiesChanged() }
+}
+