src/Pure/Thy/sessions.scala
author wenzelm
Tue Nov 07 11:11:37 2017 +0100 (17 months ago)
changeset 67018 f6aa133f9b16
parent 67012 671decd2e627
child 67023 e27e05d6f2a7
permissions -rw-r--r--
backed out odd "bug fix" 671decd2e627;
     1 /*  Title:      Pure/Thy/sessions.scala
     2     Author:     Makarius
     3 
     4 Cumulative session information.
     5 */
     6 
     7 package isabelle
     8 
     9 import java.io.{File => JFile}
    10 import java.nio.ByteBuffer
    11 import java.nio.channels.FileChannel
    12 import java.nio.file.StandardOpenOption
    13 
    14 import scala.collection.SortedSet
    15 import scala.collection.mutable
    16 
    17 
    18 object Sessions
    19 {
    20   /* base info and source dependencies */
    21 
    22   val DRAFT = "Draft"
    23 
    24   def is_pure(name: String): Boolean = name == Thy_Header.PURE
    25 
    26   object Known
    27   {
    28     val empty: Known = Known()
    29 
    30     def make(local_dir: Path, bases: List[Base],
    31       theories: List[Document.Node.Name] = Nil,
    32       loaded_files: List[(String, List[Path])] = Nil): Known =
    33     {
    34       def bases_iterator(local: Boolean) =
    35         for {
    36           base <- bases.iterator
    37           (_, name) <- (if (local) base.known.theories_local else base.known.theories).iterator
    38         } yield name
    39 
    40       def local_theories_iterator =
    41       {
    42         val local_path = local_dir.canonical_file.toPath
    43         theories.iterator.filter(name => name.path.canonical_file.toPath.startsWith(local_path))
    44       }
    45 
    46       val known_theories =
    47         (Map.empty[String, Document.Node.Name] /: (bases_iterator(false) ++ theories.iterator))({
    48           case (known, name) =>
    49             known.get(name.theory) match {
    50               case Some(name1) if name != name1 =>
    51                 error("Duplicate theory " + quote(name.node) + " vs. " + quote(name1.node))
    52               case _ => known + (name.theory -> name)
    53             }
    54           })
    55       val known_theories_local =
    56         (Map.empty[String, Document.Node.Name] /:
    57             (bases_iterator(true) ++ local_theories_iterator))({
    58           case (known, name) => known + (name.theory -> name)
    59         })
    60       val known_files =
    61         (Map.empty[JFile, List[Document.Node.Name]] /:
    62             (bases_iterator(true) ++ bases_iterator(false) ++ theories.iterator))({
    63           case (known, name) =>
    64             val file = name.path.canonical_file
    65             val theories1 = known.getOrElse(file, Nil)
    66             if (theories1.exists(name1 => name.node == name1.node && name.theory == name1.theory))
    67               known
    68             else known + (file -> (name :: theories1))
    69         })
    70 
    71       val known_loaded_files =
    72         (loaded_files.toMap /: bases.map(base => base.known.loaded_files))(_ ++ _)
    73 
    74       Known(known_theories, known_theories_local,
    75         known_files.iterator.map(p => (p._1, p._2.reverse)).toMap,
    76         known_loaded_files)
    77     }
    78   }
    79 
    80   sealed case class Known(
    81     theories: Map[String, Document.Node.Name] = Map.empty,
    82     theories_local: Map[String, Document.Node.Name] = Map.empty,
    83     files: Map[JFile, List[Document.Node.Name]] = Map.empty,
    84     loaded_files: Map[String, List[Path]] = Map.empty)
    85   {
    86     def platform_path: Known =
    87       copy(theories = for ((a, b) <- theories) yield (a, b.map(File.platform_path(_))),
    88         theories_local = for ((a, b) <- theories_local) yield (a, b.map(File.platform_path(_))),
    89         files = for ((a, b) <- files) yield (a, b.map(c => c.map(File.platform_path(_)))))
    90 
    91     def standard_path: Known =
    92       copy(theories = for ((a, b) <- theories) yield (a, b.map(File.standard_path(_))),
    93         theories_local = for ((a, b) <- theories_local) yield (a, b.map(File.standard_path(_))),
    94         files = for ((a, b) <- files) yield (a, b.map(c => c.map(File.standard_path(_)))))
    95 
    96     def get_file(file: JFile, bootstrap: Boolean = false): Option[Document.Node.Name] =
    97     {
    98       val res = files.getOrElse(File.canonical(file), Nil).headOption
    99       if (bootstrap) res.map(_.map_theory(Thy_Header.bootstrap_name(_))) else res
   100     }
   101   }
   102 
   103   object Base
   104   {
   105     def bootstrap(global_theories: Map[String, String]): Base =
   106       Base(
   107         global_theories = global_theories,
   108         overall_syntax = Thy_Header.bootstrap_syntax)
   109   }
   110 
   111   sealed case class Base(
   112     pos: Position.T = Position.none,
   113     global_theories: Map[String, String] = Map.empty,
   114     loaded_theories: Graph[String, Outer_Syntax] = Graph.string,
   115     known: Known = Known.empty,
   116     overall_syntax: Outer_Syntax = Outer_Syntax.empty,
   117     imported_sources: List[(Path, SHA1.Digest)] = Nil,
   118     sources: List[(Path, SHA1.Digest)] = Nil,
   119     session_graph_display: Graph_Display.Graph = Graph_Display.empty_graph,
   120     errors: List[String] = Nil,
   121     imports: Option[Base] = None)
   122   {
   123     def platform_path: Base = copy(known = known.platform_path)
   124     def standard_path: Base = copy(known = known.standard_path)
   125 
   126     def theory_qualifier(name: String): String =
   127       global_theories.getOrElse(name, Long_Name.qualifier(name))
   128     def theory_qualifier(name: Document.Node.Name): String = theory_qualifier(name.theory)
   129 
   130     def loaded_theory(name: String): Boolean = loaded_theories.defined(name)
   131     def loaded_theory(name: Document.Node.Name): Boolean = loaded_theory(name.theory)
   132 
   133     def loaded_theory_syntax(name: String): Option[Outer_Syntax] =
   134       if (loaded_theory(name)) Some(loaded_theories.get_node(name)) else None
   135     def loaded_theory_syntax(name: Document.Node.Name): Option[Outer_Syntax] =
   136       loaded_theory_syntax(name.theory)
   137 
   138     def node_syntax(nodes: Document.Nodes, name: Document.Node.Name): Outer_Syntax =
   139       nodes(name).syntax orElse loaded_theory_syntax(name) getOrElse overall_syntax
   140 
   141     def known_theory(name: String): Option[Document.Node.Name] =
   142       known.theories.get(name)
   143 
   144     def dest_known_theories: List[(String, String)] =
   145       for ((theory, node_name) <- known.theories.toList)
   146         yield (theory, node_name.node)
   147 
   148     def get_imports: Base = imports getOrElse Base.bootstrap(global_theories)
   149   }
   150 
   151   sealed case class Deps(session_bases: Map[String, Base], all_known: Known)
   152   {
   153     def is_empty: Boolean = session_bases.isEmpty
   154     def apply(name: String): Base = session_bases(name)
   155     def get(name: String): Option[Base] = session_bases.get(name)
   156 
   157     def imported_sources(name: String): List[SHA1.Digest] =
   158       session_bases(name).imported_sources.map(_._2)
   159 
   160     def sources(name: String): List[SHA1.Digest] =
   161       session_bases(name).sources.map(_._2)
   162 
   163     def errors: List[String] =
   164       (for {
   165         (name, base) <- session_bases.iterator
   166         if base.errors.nonEmpty
   167       } yield cat_lines(base.errors) +
   168           "\nThe error(s) above occurred in session " + quote(name) + Position.here(base.pos)
   169       ).toList
   170 
   171     def check_errors: Deps =
   172       errors match {
   173         case Nil => this
   174         case errs => error(cat_lines(errs))
   175       }
   176   }
   177 
   178   def deps(sessions: T,
   179       global_theories: Map[String, String],
   180       progress: Progress = No_Progress,
   181       inlined_files: Boolean = false,
   182       verbose: Boolean = false,
   183       list_files: Boolean = false,
   184       check_keywords: Set[String] = Set.empty): Deps =
   185   {
   186     var cache_sources = Map.empty[JFile, SHA1.Digest]
   187     def check_sources(paths: List[Path]): List[(Path, SHA1.Digest)] =
   188     {
   189       for {
   190         path <- paths
   191         file = path.file
   192         if cache_sources.isDefinedAt(file) || file.isFile
   193       }
   194       yield {
   195         cache_sources.get(file) match {
   196           case Some(digest) => (path, digest)
   197           case None =>
   198             val digest = SHA1.digest(file)
   199             cache_sources = cache_sources + (file -> digest)
   200             (path, digest)
   201         }
   202       }
   203     }
   204 
   205     val session_bases =
   206       (Map.empty[String, Base] /: sessions.imports_topological_order)({
   207         case (session_bases, info) =>
   208           if (progress.stopped) throw Exn.Interrupt()
   209 
   210           try {
   211             val parent_base: Sessions.Base =
   212               info.parent match {
   213                 case None => Base.bootstrap(global_theories)
   214                 case Some(parent) => session_bases(parent)
   215               }
   216             val imports_base: Sessions.Base =
   217               parent_base.copy(known =
   218                 Known.make(info.dir, parent_base :: info.imports.map(session_bases(_))))
   219 
   220             val resources = new Resources(imports_base)
   221 
   222             if (verbose || list_files) {
   223               val groups =
   224                 if (info.groups.isEmpty) ""
   225                 else info.groups.mkString(" (", " ", ")")
   226               progress.echo("Session " + info.chapter + "/" + info.name + groups)
   227             }
   228 
   229             val thy_deps =
   230               resources.dependencies(
   231                 for { (_, thys) <- info.theories; (thy, pos) <- thys }
   232                 yield (resources.import_name(info.name, info.dir.implode, thy), pos))
   233 
   234             val overall_syntax = thy_deps.overall_syntax
   235 
   236             val theory_files = thy_deps.names.map(_.path)
   237             val loaded_files =
   238               if (inlined_files) {
   239                 if (Sessions.is_pure(info.name)) {
   240                   (Thy_Header.PURE -> resources.pure_files(overall_syntax, info.dir)) ::
   241                     thy_deps.loaded_files.filterNot(p => p._1 == Thy_Header.PURE)
   242                 }
   243                 else thy_deps.loaded_files
   244               }
   245               else Nil
   246 
   247             val session_files =
   248               (theory_files ::: loaded_files.flatMap(_._2) :::
   249                 info.document_files.map(file => info.dir + file._1 + file._2)).map(_.expand)
   250 
   251             val imported_files = if (inlined_files) thy_deps.imported_files else Nil
   252 
   253             if (list_files)
   254               progress.echo(cat_lines(session_files.map(_.implode).sorted.map("  " + _)))
   255 
   256             if (check_keywords.nonEmpty) {
   257               Check_Keywords.check_keywords(
   258                 progress, overall_syntax.keywords, check_keywords, theory_files)
   259             }
   260 
   261             val session_graph_display: Graph_Display.Graph =
   262             {
   263               def session_node(name: String): Graph_Display.Node =
   264                 Graph_Display.Node("[" + name + "]", "session." + name)
   265 
   266               def node(name: Document.Node.Name): Graph_Display.Node =
   267               {
   268                 val qualifier = imports_base.theory_qualifier(name)
   269                 if (qualifier == info.name)
   270                   Graph_Display.Node(name.theory_base_name, "theory." + name.theory)
   271                 else session_node(qualifier)
   272               }
   273 
   274               val imports_subgraph =
   275                 sessions.imports_graph.restrict(sessions.imports_graph.all_preds(info.deps).toSet)
   276 
   277               val graph0 =
   278                 (Graph_Display.empty_graph /: imports_subgraph.topological_order)(
   279                   { case (g, session) =>
   280                       val a = session_node(session)
   281                       val bs = imports_subgraph.imm_preds(session).toList.map(session_node(_))
   282                       ((g /: (a :: bs))(_.default_node(_, Nil)) /: bs)(_.add_edge(_, a)) })
   283 
   284               (graph0 /: thy_deps.entries)(
   285                 { case (g, entry) =>
   286                     val a = node(entry.name)
   287                     val bs =
   288                       entry.header.imports.map({ case (name, _) => node(name) }).
   289                         filterNot(_ == a)
   290                     ((g /: (a :: bs))(_.default_node(_, Nil)) /: bs)(_.add_edge(_, a)) })
   291             }
   292 
   293             val known =
   294               Known.make(info.dir, List(imports_base),
   295                 theories = thy_deps.names,
   296                 loaded_files = loaded_files)
   297 
   298             val sources_errors =
   299               for (p <- session_files if !p.is_file) yield "No such file: " + p
   300 
   301             val base =
   302               Base(
   303                 pos = info.pos,
   304                 global_theories = global_theories,
   305                 loaded_theories = thy_deps.loaded_theories,
   306                 known = known,
   307                 overall_syntax = overall_syntax,
   308                 imported_sources = check_sources(imported_files),
   309                 sources = check_sources(session_files),
   310                 session_graph_display = session_graph_display,
   311                 errors = thy_deps.errors ::: sources_errors,
   312                 imports = Some(imports_base))
   313 
   314             session_bases + (info.name -> base)
   315           }
   316           catch {
   317             case ERROR(msg) =>
   318               cat_error(msg, "The error(s) above occurred in session " +
   319                 quote(info.name) + Position.here(info.pos))
   320           }
   321       })
   322 
   323     Deps(session_bases, Known.make(Path.current, session_bases.toList.map(_._2)))
   324   }
   325 
   326 
   327   /* base info */
   328 
   329   sealed case class Base_Info(
   330     session: String,
   331     sessions: T,
   332     errors: List[String],
   333     base: Base,
   334     infos: List[Info])
   335   {
   336     def check_base: Base = if (errors.isEmpty) base else error(cat_lines(errors))
   337   }
   338 
   339   def base_info(options: Options, session: String,
   340     dirs: List[Path] = Nil,
   341     ancestor_session: Option[String] = None,
   342     all_known: Boolean = false,
   343     focus_session: Boolean = false,
   344     required_session: Boolean = false): Base_Info =
   345   {
   346     val full_sessions = load(options, dirs = dirs)
   347     val global_theories = full_sessions.global_theories
   348 
   349     val selected_sessions =
   350       full_sessions.selection(Selection(sessions = session :: ancestor_session.toList))._2
   351     val info = selected_sessions(session)
   352     val ancestor = ancestor_session orElse info.parent
   353 
   354     val (session1, infos1) =
   355       if (required_session && ancestor.isDefined) {
   356         val deps = Sessions.deps(selected_sessions, global_theories)
   357         val base = deps(session)
   358 
   359         val ancestor_loaded =
   360           deps.get(ancestor.get) match {
   361             case Some(ancestor_base)
   362             if !selected_sessions.imports_requirements(List(ancestor.get)).contains(session) =>
   363               ancestor_base.loaded_theories.defined(_)
   364             case _ =>
   365               error("Bad ancestor " + quote(ancestor.get) + " for session " + quote(session))
   366           }
   367 
   368         val required_theories =
   369           for {
   370             thy <- base.loaded_theories.keys
   371             if !ancestor_loaded(thy) && base.theory_qualifier(thy) != session
   372           }
   373           yield thy
   374 
   375         if (required_theories.isEmpty) (ancestor.get, Nil)
   376         else {
   377           val other_name = info.name + "_base(" + ancestor.get + ")"
   378           (other_name,
   379             List(
   380               make_info(info.options,
   381                 dir_selected = false,
   382                 dir = info.dir,
   383                 chapter = info.chapter,
   384                 Session_Entry(
   385                   pos = info.pos,
   386                   name = other_name,
   387                   groups = info.groups,
   388                   path = ".",
   389                   parent = ancestor,
   390                   description = "Required theory imports from other sessions",
   391                   options = Nil,
   392                   imports = info.deps,
   393                   theories = List((Nil, required_theories.map(thy => ((thy, Position.none), false)))),
   394                   document_files = Nil))))
   395         }
   396       }
   397       else (session, Nil)
   398 
   399     val full_sessions1 =
   400       if (infos1.isEmpty) full_sessions
   401       else load(options, dirs = dirs, infos = infos1)
   402 
   403     val select_sessions1 =
   404       if (focus_session) full_sessions1.imports_descendants(List(session1))
   405       else List(session1)
   406     val selected_sessions1 =
   407       full_sessions1.selection(Selection(sessions = select_sessions1))._2
   408 
   409     val sessions1 = if (all_known) full_sessions1 else selected_sessions1
   410     val deps1 = Sessions.deps(sessions1, global_theories)
   411     val base1 = if (all_known) deps1(session1).copy(known = deps1.all_known) else deps1(session1)
   412 
   413     Base_Info(session1, sessions1, deps1.errors, base1, infos1)
   414   }
   415 
   416 
   417   /* cumulative session info */
   418 
   419   sealed case class Info(
   420     name: String,
   421     chapter: String,
   422     dir_selected: Boolean,
   423     pos: Position.T,
   424     groups: List[String],
   425     dir: Path,
   426     parent: Option[String],
   427     description: String,
   428     options: Options,
   429     imports: List[String],
   430     theories: List[(Options, List[(String, Position.T)])],
   431     global_theories: List[String],
   432     document_files: List[(Path, Path)],
   433     meta_digest: SHA1.Digest)
   434   {
   435     def deps: List[String] = parent.toList ::: imports
   436 
   437     def timeout: Time = Time.seconds(options.real("timeout") * options.real("timeout_scale"))
   438   }
   439 
   440   def make_info(options: Options, dir_selected: Boolean, dir: Path, chapter: String,
   441     entry: Session_Entry): Info =
   442   {
   443     try {
   444       val name = entry.name
   445 
   446       if (name == "" || name == DRAFT) error("Bad session name")
   447       if (is_pure(name) && entry.parent.isDefined) error("Illegal parent session")
   448       if (!is_pure(name) && !entry.parent.isDefined) error("Missing parent session")
   449 
   450       val session_options = options ++ entry.options
   451 
   452       val theories =
   453         entry.theories.map({ case (opts, thys) => (session_options ++ opts, thys.map(_._1)) })
   454 
   455       val global_theories =
   456         for { (_, thys) <- entry.theories; ((thy, pos), global) <- thys if global }
   457         yield {
   458           val thy_name = Path.explode(thy).expand.base_name
   459           if (Long_Name.is_qualified(thy_name))
   460             error("Bad qualified name for global theory " +
   461               quote(thy_name) + Position.here(pos))
   462           else thy_name
   463         }
   464 
   465       val conditions =
   466         theories.flatMap(thys => space_explode(',', thys._1.string("condition"))).distinct.sorted.
   467           map(x => (x, Isabelle_System.getenv(x) != ""))
   468 
   469       val document_files =
   470         entry.document_files.map({ case (s1, s2) => (Path.explode(s1), Path.explode(s2)) })
   471 
   472       val meta_digest =
   473         SHA1.digest((name, chapter, entry.parent, entry.options, entry.imports,
   474           entry.theories_no_position, conditions, entry.document_files).toString)
   475 
   476       Info(name, chapter, dir_selected, entry.pos, entry.groups,
   477         dir + Path.explode(entry.path), entry.parent, entry.description, session_options,
   478         entry.imports, theories, global_theories, document_files, meta_digest)
   479     }
   480     catch {
   481       case ERROR(msg) =>
   482         error(msg + "\nThe error(s) above occurred in session entry " +
   483           quote(entry.name) + Position.here(entry.pos))
   484     }
   485   }
   486 
   487   object Selection
   488   {
   489     val empty: Selection = Selection()
   490     val all: Selection = Selection(all_sessions = true)
   491   }
   492 
   493   sealed case class Selection(
   494     requirements: Boolean = false,
   495     all_sessions: Boolean = false,
   496     base_sessions: List[String] = Nil,
   497     exclude_session_groups: List[String] = Nil,
   498     exclude_sessions: List[String] = Nil,
   499     session_groups: List[String] = Nil,
   500     sessions: List[String] = Nil)
   501   {
   502     def ++ (other: Selection): Selection =
   503       Selection(
   504         requirements = requirements || other.requirements,
   505         all_sessions = all_sessions || other.all_sessions,
   506         base_sessions = Library.merge(base_sessions, other.base_sessions),
   507         exclude_session_groups = Library.merge(exclude_session_groups, other.exclude_session_groups),
   508         exclude_sessions = Library.merge(exclude_sessions, other.exclude_sessions),
   509         session_groups = Library.merge(session_groups, other.session_groups),
   510         sessions = Library.merge(sessions, other.sessions))
   511 
   512     def apply(graph: Graph[String, Info]): (List[String], Graph[String, Info]) =
   513     {
   514       val bad_sessions =
   515         SortedSet((base_sessions ::: exclude_sessions ::: sessions).
   516           filterNot(graph.defined(_)): _*).toList
   517       if (bad_sessions.nonEmpty)
   518         error("Undefined session(s): " + commas_quote(bad_sessions))
   519 
   520       val excluded =
   521       {
   522         val exclude_group = exclude_session_groups.toSet
   523         val exclude_group_sessions =
   524           (for {
   525             (name, (info, _)) <- graph.iterator
   526             if graph.get_node(name).groups.exists(exclude_group)
   527           } yield name).toList
   528         graph.all_succs(exclude_group_sessions ::: exclude_sessions).toSet
   529       }
   530 
   531       val pre_selected =
   532       {
   533         if (all_sessions) graph.keys
   534         else {
   535           val select_group = session_groups.toSet
   536           val select = sessions.toSet ++ graph.all_succs(base_sessions)
   537           (for {
   538             (name, (info, _)) <- graph.iterator
   539             if info.dir_selected || select(name) || graph.get_node(name).groups.exists(select_group)
   540           } yield name).toList
   541         }
   542       }.filterNot(excluded)
   543 
   544       val selected =
   545         if (requirements) (graph.all_preds(pre_selected).toSet -- pre_selected).toList
   546         else pre_selected
   547 
   548       (selected, graph.restrict(graph.all_preds(selected).toSet))
   549     }
   550   }
   551 
   552   def make(infos: List[Info]): T =
   553   {
   554     def add_edges(graph: Graph[String, Info], kind: String, edges: Info => Traversable[String])
   555       : Graph[String, Info] =
   556     {
   557       def add_edge(pos: Position.T, name: String, g: Graph[String, Info], parent: String) =
   558       {
   559         if (!g.defined(parent))
   560           error("Bad " + kind + " session " + quote(parent) + " for " +
   561             quote(name) + Position.here(pos))
   562 
   563         try { g.add_edge_acyclic(parent, name) }
   564         catch {
   565           case exn: Graph.Cycles[_] =>
   566             error(cat_lines(exn.cycles.map(cycle =>
   567               "Cyclic session dependency of " +
   568                 cycle.map(c => quote(c.toString)).mkString(" via "))) + Position.here(pos))
   569         }
   570       }
   571       (graph /: graph.iterator) {
   572         case (g, (name, (info, _))) => (g /: edges(info))(add_edge(info.pos, name, _, _))
   573       }
   574     }
   575 
   576     val graph0 =
   577       (Graph.string[Info] /: infos) {
   578         case (graph, info) =>
   579           if (graph.defined(info.name))
   580             error("Duplicate session " + quote(info.name) + Position.here(info.pos) +
   581               Position.here(graph.get_node(info.name).pos))
   582           else graph.new_node(info.name, info)
   583       }
   584     val graph1 = add_edges(graph0, "parent", _.parent)
   585     val graph2 = add_edges(graph1, "imports", _.imports)
   586 
   587     new T(graph1, graph2)
   588   }
   589 
   590   final class T private[Sessions](
   591       val build_graph: Graph[String, Info],
   592       val imports_graph: Graph[String, Info])
   593   {
   594     def build_graph_display: Graph_Display.Graph = Graph_Display.make_graph(build_graph)
   595     def imports_graph_display: Graph_Display.Graph = Graph_Display.make_graph(imports_graph)
   596 
   597     def apply(name: String): Info = imports_graph.get_node(name)
   598     def get(name: String): Option[Info] =
   599       if (imports_graph.defined(name)) Some(imports_graph.get_node(name)) else None
   600 
   601     def global_theories: Map[String, String] =
   602       (Thy_Header.bootstrap_global_theories.toMap /:
   603         (for {
   604           (_, (info, _)) <- imports_graph.iterator
   605           thy <- info.global_theories.iterator }
   606          yield (thy, info)))({
   607             case (global, (thy, info)) =>
   608               val qualifier = info.name
   609               global.get(thy) match {
   610                 case Some(qualifier1) if qualifier != qualifier1 =>
   611                   error("Duplicate global theory " + quote(thy) + Position.here(info.pos))
   612                 case _ => global + (thy -> qualifier)
   613               }
   614           })
   615 
   616     def selection(select: Selection): (List[String], T) =
   617     {
   618       val (_, build_graph1) = select(build_graph)
   619       val (selected, imports_graph1) = select(imports_graph)
   620       (selected, new T(build_graph1, imports_graph1))
   621     }
   622 
   623     def build_descendants(names: List[String]): List[String] =
   624       build_graph.all_succs(names)
   625     def build_requirements(names: List[String]): List[String] =
   626       build_graph.all_preds(names).reverse
   627     def build_topological_order: List[Info] =
   628       build_graph.topological_order.map(apply(_))
   629 
   630     def imports_descendants(names: List[String]): List[String] =
   631       imports_graph.all_succs(names)
   632     def imports_requirements(names: List[String]): List[String] =
   633       imports_graph.all_preds(names).reverse
   634     def imports_topological_order: List[Info] =
   635       imports_graph.topological_order.map(apply(_))
   636 
   637     override def toString: String =
   638       imports_graph.keys_iterator.mkString("Sessions.T(", ", ", ")")
   639   }
   640 
   641 
   642   /* parser */
   643 
   644   val ROOT = Path.explode("ROOT")
   645   val ROOTS = Path.explode("ROOTS")
   646 
   647   private val CHAPTER = "chapter"
   648   private val SESSION = "session"
   649   private val IN = "in"
   650   private val DESCRIPTION = "description"
   651   private val OPTIONS = "options"
   652   private val SESSIONS = "sessions"
   653   private val THEORIES = "theories"
   654   private val GLOBAL = "global"
   655   private val DOCUMENT_FILES = "document_files"
   656 
   657   val root_syntax =
   658     Outer_Syntax.empty + "(" + ")" + "+" + "," + "=" + "[" + "]" + GLOBAL + IN +
   659       (CHAPTER, Keyword.THY_DECL) +
   660       (SESSION, Keyword.THY_DECL) +
   661       (DESCRIPTION, Keyword.QUASI_COMMAND) +
   662       (OPTIONS, Keyword.QUASI_COMMAND) +
   663       (SESSIONS, Keyword.QUASI_COMMAND) +
   664       (THEORIES, Keyword.QUASI_COMMAND) +
   665       (DOCUMENT_FILES, Keyword.QUASI_COMMAND)
   666 
   667   abstract class Entry
   668   sealed case class Chapter(name: String) extends Entry
   669   sealed case class Session_Entry(
   670     pos: Position.T,
   671     name: String,
   672     groups: List[String],
   673     path: String,
   674     parent: Option[String],
   675     description: String,
   676     options: List[Options.Spec],
   677     imports: List[String],
   678     theories: List[(List[Options.Spec], List[((String, Position.T), Boolean)])],
   679     document_files: List[(String, String)]) extends Entry
   680   {
   681     def theories_no_position: List[(List[Options.Spec], List[(String, Boolean)])] =
   682       theories.map({ case (a, b) => (a, b.map({ case ((c, _), d) => (c, d) })) })
   683   }
   684 
   685   private object Parser extends Parse.Parser with Options.Parser
   686   {
   687     private val chapter: Parser[Chapter] =
   688     {
   689       val chapter_name = atom("chapter name", _.is_name)
   690 
   691       command(CHAPTER) ~! chapter_name ^^ { case _ ~ a => Chapter(a) }
   692     }
   693 
   694     private val session_entry: Parser[Session_Entry] =
   695     {
   696       val option =
   697         option_name ~ opt($$$("=") ~! option_value ^^
   698           { case _ ~ x => x }) ^^ { case x ~ y => (x, y) }
   699       val options = $$$("[") ~> rep1sep(option, $$$(",")) <~ $$$("]")
   700 
   701       val global =
   702         ($$$("(") ~! $$$(GLOBAL) ~ $$$(")")) ^^ { case _ => true } | success(false)
   703 
   704       val theory_entry =
   705         position(theory_name) ~ global ^^ { case x ~ y => (x, y) }
   706 
   707       val theories =
   708         $$$(THEORIES) ~!
   709           ((options | success(Nil)) ~ rep1(theory_entry)) ^^
   710           { case _ ~ (x ~ y) => (x, y) }
   711 
   712       val document_files =
   713         $$$(DOCUMENT_FILES) ~!
   714           (($$$("(") ~! ($$$(IN) ~! (path ~ $$$(")"))) ^^
   715               { case _ ~ (_ ~ (x ~ _)) => x } | success("document")) ~
   716             rep1(path)) ^^ { case _ ~ (x ~ y) => y.map((x, _)) }
   717 
   718       command(SESSION) ~!
   719         (position(session_name) ~
   720           (($$$("(") ~! (rep1(name) <~ $$$(")")) ^^ { case _ ~ x => x }) | success(Nil)) ~
   721           (($$$(IN) ~! path ^^ { case _ ~ x => x }) | success(".")) ~
   722           ($$$("=") ~!
   723             (opt(session_name ~! $$$("+") ^^ { case x ~ _ => x }) ~
   724               (($$$(DESCRIPTION) ~! text ^^ { case _ ~ x => x }) | success("")) ~
   725               (($$$(OPTIONS) ~! options ^^ { case _ ~ x => x }) | success(Nil)) ~
   726               (($$$(SESSIONS) ~! rep1(session_name)  ^^ { case _ ~ x => x }) | success(Nil)) ~
   727               rep(theories) ~
   728               (rep(document_files) ^^ (x => x.flatten))))) ^^
   729         { case _ ~ ((a, pos) ~ b ~ c ~ (_ ~ (d ~ e ~ f ~ g ~ h ~ i))) =>
   730             Session_Entry(pos, a, b, c, d, e, f, g, h, i) }
   731     }
   732 
   733     def parse_root(path: Path): List[Entry] =
   734     {
   735       val toks = Token.explode(root_syntax.keywords, File.read(path))
   736       val start = Token.Pos.file(path.implode)
   737 
   738       parse_all(rep(chapter | session_entry), Token.reader(toks, start)) match {
   739         case Success(result, _) => result
   740         case bad => error(bad.toString)
   741       }
   742     }
   743   }
   744 
   745   def parse_root(path: Path): List[Entry] = Parser.parse_root(path)
   746 
   747   def parse_root_entries(path: Path): List[Session_Entry] =
   748     for (entry <- Parser.parse_root(path) if entry.isInstanceOf[Session_Entry])
   749     yield entry.asInstanceOf[Session_Entry]
   750 
   751   def read_root(options: Options, select: Boolean, path: Path): List[Info] =
   752   {
   753     var entry_chapter = "Unsorted"
   754     val infos = new mutable.ListBuffer[Info]
   755     parse_root(path).foreach {
   756       case Chapter(name) => entry_chapter = name
   757       case entry: Session_Entry =>
   758         infos += make_info(options, select, path.dir, entry_chapter, entry)
   759     }
   760     infos.toList
   761   }
   762 
   763   def parse_roots(roots: Path): List[String] =
   764   {
   765     for {
   766       line <- split_lines(File.read(roots))
   767       if !(line == "" || line.startsWith("#"))
   768     } yield line
   769   }
   770 
   771 
   772   /* load sessions from certain directories */
   773 
   774   private def is_session_dir(dir: Path): Boolean =
   775     (dir + ROOT).is_file || (dir + ROOTS).is_file
   776 
   777   private def check_session_dir(dir: Path): Path =
   778     if (is_session_dir(dir)) File.pwd() + dir.expand
   779     else error("Bad session root directory: " + dir.toString)
   780 
   781   def directories(dirs: List[Path], select_dirs: List[Path]): List[(Boolean, Path)] =
   782   {
   783     val default_dirs = Isabelle_System.components().filter(is_session_dir(_))
   784     (default_dirs ::: dirs).map((false, _)) ::: select_dirs.map((true, _))
   785   }
   786 
   787   def load(options: Options,
   788     dirs: List[Path] = Nil,
   789     select_dirs: List[Path] = Nil,
   790     infos: List[Info] = Nil): T =
   791   {
   792     def load_dir(select: Boolean, dir: Path): List[(Boolean, Path)] =
   793       load_root(select, dir) ::: load_roots(select, dir)
   794 
   795     def load_root(select: Boolean, dir: Path): List[(Boolean, Path)] =
   796     {
   797       val root = dir + ROOT
   798       if (root.is_file) List((select, root)) else Nil
   799     }
   800 
   801     def load_roots(select: Boolean, dir: Path): List[(Boolean, Path)] =
   802     {
   803       val roots = dir + ROOTS
   804       if (roots.is_file) {
   805         for {
   806           entry <- parse_roots(roots)
   807           dir1 =
   808             try { check_session_dir(dir + Path.explode(entry)) }
   809             catch {
   810               case ERROR(msg) =>
   811                 error(msg + "\nThe error(s) above occurred in session catalog " + roots.toString)
   812             }
   813           res <- load_dir(select, dir1)
   814         } yield res
   815       }
   816       else Nil
   817     }
   818 
   819     val roots =
   820       for {
   821         (select, dir) <- directories(dirs, select_dirs)
   822         res <- load_dir(select, check_session_dir(dir))
   823       } yield res
   824 
   825     val unique_roots =
   826       ((Map.empty[JFile, (Boolean, Path)] /: roots) { case (m, (select, path)) =>
   827         val file = path.canonical_file
   828         m.get(file) match {
   829           case None => m + (file -> (select, path))
   830           case Some((select1, path1)) => m + (file -> (select1 || select, path1))
   831         }
   832       }).toList.map(_._2)
   833 
   834     make(unique_roots.flatMap(p => read_root(options, p._1, p._2)) ::: infos)
   835   }
   836 
   837 
   838 
   839   /** heap file with SHA1 digest **/
   840 
   841   private val sha1_prefix = "SHA1:"
   842 
   843   def read_heap_digest(heap: Path): Option[String] =
   844   {
   845     if (heap.is_file) {
   846       val file = FileChannel.open(heap.file.toPath, StandardOpenOption.READ)
   847       try {
   848         val len = file.size
   849         val n = sha1_prefix.length + SHA1.digest_length
   850         if (len >= n) {
   851           file.position(len - n)
   852 
   853           val buf = ByteBuffer.allocate(n)
   854           var i = 0
   855           var m = 0
   856           do {
   857             m = file.read(buf)
   858             if (m != -1) i += m
   859           }
   860           while (m != -1 && n > i)
   861 
   862           if (i == n) {
   863             val prefix = new String(buf.array(), 0, sha1_prefix.length, UTF8.charset)
   864             val s = new String(buf.array(), sha1_prefix.length, SHA1.digest_length, UTF8.charset)
   865             if (prefix == sha1_prefix) Some(s) else None
   866           }
   867           else None
   868         }
   869         else None
   870       }
   871       finally { file.close }
   872     }
   873     else None
   874   }
   875 
   876   def write_heap_digest(heap: Path): String =
   877     read_heap_digest(heap) match {
   878       case None =>
   879         val s = SHA1.digest(heap).rep
   880         File.append(heap, sha1_prefix + s)
   881         s
   882       case Some(s) => s
   883     }
   884 
   885 
   886 
   887   /** persistent store **/
   888 
   889   object Session_Info
   890   {
   891     val session_name = SQL.Column.string("session_name").make_primary_key
   892 
   893     // Build_Log.Session_Info
   894     val session_timing = SQL.Column.bytes("session_timing")
   895     val command_timings = SQL.Column.bytes("command_timings")
   896     val theory_timings = SQL.Column.bytes("theory_timings")
   897     val ml_statistics = SQL.Column.bytes("ml_statistics")
   898     val task_statistics = SQL.Column.bytes("task_statistics")
   899     val errors = SQL.Column.bytes("errors")
   900     val build_log_columns =
   901       List(session_name, session_timing, command_timings, theory_timings,
   902         ml_statistics, task_statistics, errors)
   903 
   904     // Build.Session_Info
   905     val sources = SQL.Column.string("sources")
   906     val input_heaps = SQL.Column.string("input_heaps")
   907     val output_heap = SQL.Column.string("output_heap")
   908     val return_code = SQL.Column.int("return_code")
   909     val build_columns = List(sources, input_heaps, output_heap, return_code)
   910 
   911     val table = SQL.Table("isabelle_session_info", build_log_columns ::: build_columns)
   912   }
   913 
   914   def store(system_mode: Boolean = false): Store = new Store(system_mode)
   915 
   916   class Store private[Sessions](system_mode: Boolean)
   917   {
   918     /* file names */
   919 
   920     def database(name: String): Path = Path.basic("log") + Path.basic(name).ext("db")
   921     def log(name: String): Path = Path.basic("log") + Path.basic(name)
   922     def log_gz(name: String): Path = log(name).ext("gz")
   923 
   924 
   925     /* SQL database content */
   926 
   927     val xml_cache = new XML.Cache()
   928 
   929     def read_bytes(db: SQL.Database, name: String, column: SQL.Column): Bytes =
   930       db.using_statement(Session_Info.table.select(List(column),
   931         Session_Info.session_name.where_equal(name)))(stmt =>
   932       {
   933         val res = stmt.execute_query()
   934         if (!res.next()) Bytes.empty else res.bytes(column)
   935       })
   936 
   937     def read_properties(db: SQL.Database, name: String, column: SQL.Column): List[Properties.T] =
   938       Properties.uncompress(read_bytes(db, name, column), Some(xml_cache))
   939 
   940 
   941     /* output */
   942 
   943     val browser_info: Path =
   944       if (system_mode) Path.explode("~~/browser_info")
   945       else Path.explode("$ISABELLE_BROWSER_INFO")
   946 
   947     val output_dir: Path =
   948       if (system_mode) Path.explode("~~/heaps/$ML_IDENTIFIER")
   949       else Path.explode("$ISABELLE_OUTPUT")
   950 
   951     override def toString: String = "Store(output_dir = " + output_dir.expand + ")"
   952 
   953     def prepare_output() { Isabelle_System.mkdirs(output_dir + Path.basic("log")) }
   954 
   955 
   956     /* input */
   957 
   958     private val input_dirs =
   959       if (system_mode) List(output_dir)
   960       else {
   961         val ml_ident = Path.explode("$ML_IDENTIFIER").expand
   962         output_dir :: Path.split(Isabelle_System.getenv_strict("ISABELLE_PATH")).map(_ + ml_ident)
   963       }
   964 
   965     def find_database_heap(name: String): Option[(Path, Option[String])] =
   966       input_dirs.find(dir => (dir + database(name)).is_file).map(dir =>
   967         (dir + database(name), read_heap_digest(dir + Path.basic(name))))
   968 
   969     def find_database(name: String): Option[Path] =
   970       input_dirs.map(_ + database(name)).find(_.is_file)
   971 
   972     def heap(name: String): Path =
   973       input_dirs.map(_ + Path.basic(name)).find(_.is_file) getOrElse
   974         error("Unknown logic " + quote(name) + " -- no heap file found in:\n" +
   975           cat_lines(input_dirs.map(dir => "  " + dir.expand.implode)))
   976 
   977 
   978     /* session info */
   979 
   980     def write_session_info(
   981       db: SQL.Database,
   982       name: String,
   983       build_log: Build_Log.Session_Info,
   984       build: Build.Session_Info)
   985     {
   986       db.transaction {
   987         db.create_table(Session_Info.table)
   988         db.using_statement(
   989           Session_Info.table.delete(Session_Info.session_name.where_equal(name)))(_.execute)
   990         db.using_statement(Session_Info.table.insert())(stmt =>
   991         {
   992           stmt.string(1) = name
   993           stmt.bytes(2) = Properties.encode(build_log.session_timing)
   994           stmt.bytes(3) = Properties.compress(build_log.command_timings)
   995           stmt.bytes(4) = Properties.compress(build_log.theory_timings)
   996           stmt.bytes(5) = Properties.compress(build_log.ml_statistics)
   997           stmt.bytes(6) = Properties.compress(build_log.task_statistics)
   998           stmt.bytes(7) = Build_Log.compress_errors(build_log.errors)
   999           stmt.string(8) = build.sources
  1000           stmt.string(9) = cat_lines(build.input_heaps)
  1001           stmt.string(10) = build.output_heap getOrElse ""
  1002           stmt.int(11) = build.return_code
  1003           stmt.execute()
  1004         })
  1005       }
  1006     }
  1007 
  1008     def read_session_timing(db: SQL.Database, name: String): Properties.T =
  1009       Properties.decode(read_bytes(db, name, Session_Info.session_timing), Some(xml_cache))
  1010 
  1011     def read_command_timings(db: SQL.Database, name: String): List[Properties.T] =
  1012       read_properties(db, name, Session_Info.command_timings)
  1013 
  1014     def read_theory_timings(db: SQL.Database, name: String): List[Properties.T] =
  1015       read_properties(db, name, Session_Info.theory_timings)
  1016 
  1017     def read_ml_statistics(db: SQL.Database, name: String): List[Properties.T] =
  1018       read_properties(db, name, Session_Info.ml_statistics)
  1019 
  1020     def read_task_statistics(db: SQL.Database, name: String): List[Properties.T] =
  1021       read_properties(db, name, Session_Info.task_statistics)
  1022 
  1023     def read_errors(db: SQL.Database, name: String): List[String] =
  1024       Build_Log.uncompress_errors(read_bytes(db, name, Session_Info.errors))
  1025 
  1026     def read_build(db: SQL.Database, name: String): Option[Build.Session_Info] =
  1027     {
  1028       if (db.tables.contains(Session_Info.table.name)) {
  1029         db.using_statement(Session_Info.table.select(Session_Info.build_columns,
  1030           Session_Info.session_name.where_equal(name)))(stmt =>
  1031         {
  1032           val res = stmt.execute_query()
  1033           if (!res.next()) None
  1034           else {
  1035             Some(
  1036               Build.Session_Info(
  1037                 res.string(Session_Info.sources),
  1038                 split_lines(res.string(Session_Info.input_heaps)),
  1039                 res.string(Session_Info.output_heap) match { case "" => None case s => Some(s) },
  1040                 res.int(Session_Info.return_code)))
  1041           }
  1042         })
  1043       }
  1044       else None
  1045     }
  1046   }
  1047 }