diff -r 52d5067ca06a -r 06cc31dff138 src/Pure/PIDE/resources.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/PIDE/resources.scala	Tue Mar 18 17:39:03 2014 +0100
@@ -0,0 +1,111 @@
+/*  Title:      Pure/PIDE/resources.scala
+    Author:     Makarius
+
+Resources for theories and auxiliary files.
+*/
+
+package isabelle
+
+
+import scala.annotation.tailrec
+
+import java.io.{File => JFile}
+
+
+object Resources
+{
+  /* paths */
+
+  def thy_path(path: Path): Path = path.ext("thy")
+
+  def is_wellformed_thy_path(str: String): Boolean =
+    try { thy_path(Path.explode(str)); true }
+    catch { case ERROR(_) => false }
+}
+
+
+class Resources(val loaded_theories: Set[String] = Set.empty, val base_syntax: Outer_Syntax)
+{
+  /* document node names */
+
+  def node_name(raw_path: Path): Document.Node.Name =
+  {
+    val path = raw_path.expand
+    val node = path.implode
+    val theory = Thy_Header.thy_name(node).getOrElse("")
+    val master_dir = if (theory == "") "" else path.dir.implode
+    Document.Node.Name(node, master_dir, theory)
+  }
+
+
+  /* file-system operations */
+
+  def append(dir: String, source_path: Path): String =
+    (Path.explode(dir) + source_path).expand.implode
+
+  def with_thy_text[A](name: Document.Node.Name, f: CharSequence => A): A =
+  {
+    val path = Path.explode(name.node)
+    if (!path.is_file) error("No such file: " + path.toString)
+
+    val text = File.read(path)
+    Symbol.decode_strict(text)
+    f(text)
+  }
+
+
+  /* theory files */
+
+  def body_files_test(syntax: Outer_Syntax, text: String): Boolean =
+    syntax.thy_load_commands.exists({ case (cmd, _) => text.containsSlice(cmd) })
+
+  def body_files(syntax: Outer_Syntax, text: String): List[String] =
+  {
+    val spans = Thy_Syntax.parse_spans(syntax.scan(text))
+    spans.iterator.map(Thy_Syntax.span_files(syntax, _)).flatten.toList
+  }
+
+  def import_name(master: Document.Node.Name, s: String): Document.Node.Name =
+  {
+    val theory = Thy_Header.base_name(s)
+    if (loaded_theories(theory)) Document.Node.Name(theory + ".thy", "", theory)
+    else {
+      val path = Path.explode(s)
+      val node = append(master.master_dir, Resources.thy_path(path))
+      val master_dir = append(master.master_dir, path.dir)
+      Document.Node.Name(node, master_dir, theory)
+    }
+  }
+
+  def check_thy_text(name: Document.Node.Name, text: CharSequence): Document.Node.Header =
+  {
+    try {
+      val header = Thy_Header.read(text)
+
+      val name1 = header.name
+      if (name.theory != name1)
+        error("Bad file name " + Resources.thy_path(Path.basic(name.theory)) +
+          " for theory " + quote(name1))
+
+      val imports = header.imports.map(import_name(name, _))
+      Document.Node.Header(imports, header.keywords, Nil)
+    }
+    catch { case exn: Throwable => Document.Node.bad_header(Exn.message(exn)) }
+  }
+
+  def check_thy(name: Document.Node.Name): Document.Node.Header =
+    with_thy_text(name, check_thy_text(name, _))
+
+
+  /* theory text edits */
+
+  def text_edits(
+    reparse_limit: Int,
+    previous: Document.Version,
+    doc_blobs: Document.Blobs,
+    edits: List[Document.Edit_Text]): (Boolean, List[Document.Edit_Command], Document.Version) =
+    Thy_Syntax.text_edits(this, reparse_limit, previous, doc_blobs, edits)
+
+  def syntax_changed() { }
+}
+