src/Pure/PIDE/resources.scala
author wenzelm
Thu, 05 Oct 2017 14:58:04 +0200
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/*  Title:      Pure/PIDE/resources.scala
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    Author:     Makarius
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Resources for theories and auxiliary files.
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*/
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package isabelle
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import scala.annotation.tailrec
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import scala.util.parsing.input.Reader
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import java.io.{File => JFile}
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class Resources(
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  val session_base: Sessions.Base,
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  val log: Logger = No_Logger)
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{
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  val thy_info = new Thy_Info(this)
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  def thy_path(path: Path): Path = path.ext("thy")
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  /* file-system operations */
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  def append(dir: String, source_path: Path): String =
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    (Path.explode(dir) + source_path).expand.implode
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  def append(node_name: Document.Node.Name, source_path: Path): String =
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    append(node_name.master_dir, source_path)
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  /* source files of Isabelle/ML bootstrap */
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  def source_file(raw_name: String): Option[String] =
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  {
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    if (Path.is_wellformed(raw_name)) {
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      if (Path.is_valid(raw_name)) {
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        def check(p: Path): Option[Path] = if (p.is_file) Some(p) else None
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        val path = Path.explode(raw_name)
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        val path1 =
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          if (path.is_absolute || path.is_current) check(path)
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          else {
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            check(Path.explode("~~/src/Pure") + path) orElse
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              (if (Isabelle_System.getenv("ML_SOURCES") == "") None
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               else check(Path.explode("$ML_SOURCES") + path))
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          }
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        Some(File.platform_path(path1 getOrElse path))
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      }
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      else None
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    }
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    else Some(raw_name)
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  }
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  /* theory files */
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  def loaded_files(syntax: Outer_Syntax, name: Document.Node.Name): () => List[Path] =
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  {
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    val raw_text = with_thy_reader(name, reader => reader.source.toString)
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    () => {
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      val text = Symbol.decode(raw_text)
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      if (syntax.load_commands_in(text)) {
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        val spans = syntax.parse_spans(text)
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        val dir = Path.explode(name.master_dir)
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        spans.iterator.map(Command.span_files(syntax, _)._1).flatten.
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          map(a => (dir + Path.explode(a)).expand).toList
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      }
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      else Nil
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    }
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  }
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  def pure_files(syntax: Outer_Syntax, dir: Path): List[Path] =
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  {
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    val roots =
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      for { (name, _) <- Thy_Header.ml_roots }
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      yield (dir + Path.explode(name)).expand
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    val files =
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      for {
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        (path, (_, theory)) <- roots zip Thy_Header.ml_roots
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        file <- loaded_files(syntax, Document.Node.Name(path.implode, path.dir.implode, theory))()
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      } yield file
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    roots ::: files
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  }
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  def theory_qualifier(name: Document.Node.Name): String =
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    session_base.global_theories.getOrElse(name.theory, Long_Name.qualifier(name.theory))
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  def theory_name(qualifier: String, theory: String): (Boolean, String) =
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    if (session_base.loaded_theory(theory)) (true, theory)
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    else {
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      val theory1 =
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        if (Long_Name.is_qualified(theory) || session_base.global_theories.isDefinedAt(theory))
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          theory
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        else Long_Name.qualify(qualifier, theory)
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      (false, theory1)
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    }
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  def import_name(qualifier: String, dir: String, s: String): Document.Node.Name =
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    theory_name(qualifier, Thy_Header.import_name(s)) match {
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      case (true, theory) => Document.Node.Name.loaded_theory(theory)
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      case (false, theory) =>
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        session_base.known_theory(theory) match {
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          case Some(node_name) => node_name
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          case None =>
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            val path = Path.explode(s)
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            val node = append(dir, thy_path(path))
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            val master_dir = append(dir, path.dir)
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            Document.Node.Name(node, master_dir, theory)
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        }
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    }
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  def import_name(name: Document.Node.Name, s: String): Document.Node.Name =
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    import_name(theory_qualifier(name), name.master_dir, s)
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  def with_thy_reader[A](name: Document.Node.Name, f: Reader[Char] => A): A =
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  {
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    val path = File.check_file(name.path)
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    val reader = Scan.byte_reader(path.file)
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    try { f(reader) } finally { reader.close }
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  }
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  def check_thy_reader(node_name: Document.Node.Name, reader: Reader[Char],
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    start: Token.Pos = Token.Pos.command, strict: Boolean = true): Document.Node.Header =
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  {
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    if (node_name.is_theory && reader.source.length > 0) {
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      try {
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        val header = Thy_Header.read(reader, start, strict)
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        val base_name = node_name.theory_base_name
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        val (name, pos) = header.name
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        if (base_name != name)
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          error("Bad theory name " + quote(name) +
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            " for file " + thy_path(Path.basic(base_name)) + Position.here(pos) +
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            Completion.report_theories(pos, List(base_name)))
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        val imports = header.imports.map({ case (s, pos) => (import_name(node_name, s), pos) })
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        Document.Node.Header(imports, header.keywords, header.abbrevs)
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      }
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      catch { case exn: Throwable => Document.Node.bad_header(Exn.message(exn)) }
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    }
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    else Document.Node.no_header
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  }
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  def check_thy(name: Document.Node.Name, start: Token.Pos = Token.Pos.command,
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      strict: Boolean = true): Document.Node.Header =
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    with_thy_reader(name, check_thy_reader(name, _, start, strict))
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  /* special header */
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  def special_header(name: Document.Node.Name): Option[Document.Node.Header] =
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  {
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    val imports =
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      if (Thy_Header.is_ml_root(name.theory)) List(import_name(name, Thy_Header.ML_BOOTSTRAP))
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      else if (Thy_Header.is_bootstrap(name.theory)) List(import_name(name, Thy_Header.PURE))
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      else Nil
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    if (imports.isEmpty) None
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    else Some(Document.Node.Header(imports.map((_, Position.none))))
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  }
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  /* blobs */
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  def undefined_blobs(nodes: Document.Nodes): List[Document.Node.Name] =
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    (for {
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      (node_name, node) <- nodes.iterator
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      if !session_base.loaded_theory(node_name)
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      cmd <- node.load_commands.iterator
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      name <- cmd.blobs_undefined.iterator
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    } yield name).toList
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  /* document changes */
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  def parse_change(
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      reparse_limit: Int,
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      previous: Document.Version,
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      doc_blobs: Document.Blobs,
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      edits: List[Document.Edit_Text]): Session.Change =
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    Thy_Syntax.parse_change(this, reparse_limit, previous, doc_blobs, edits)
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  def commit(change: Session.Change) { }
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}