author  wenzelm 
Mon, 17 May 1999 21:36:11 +0200  
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(* Title: Pure/Thy/thy_info.ML 
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ID: $Id$ 
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Author: Markus Wenzel, TU Muenchen 
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Theory loader database, including theory and file dependencies. 
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*) 
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signature BASIC_THY_INFO = 
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sig 

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val theory: string > theory 

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val theory_of_sign: Sign.sg > theory 
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val theory_of_thm: thm > theory 
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(*val use: string > unit*) (*exported later*) 
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val time_use: string > unit 

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val touch_thy: string > unit 
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val use_thy: string > unit 
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val update_thy: string > unit 
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val remove_thy: string > unit 
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val time_use_thy: string > unit 
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val use_thy_only: string > unit 
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end; 
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signature THY_INFO = 
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sig 
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include BASIC_THY_INFO 
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val names: unit > string list 
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val get_theory: string > theory 
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val put_theory: theory > unit 
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val get_preds: string > string list 
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val loaded_files: string > (Path.T * File.info) list 
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val load_file: bool > Path.T > unit 

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val use_path: Path.T > unit 
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val use: string > unit 
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val begin_theory: string > string list > (Path.T * bool) list > theory 
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val end_theory: theory > theory 
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val finish: unit > unit 
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val register_theory: theory > unit 
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end; 
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structure ThyInfo: THY_INFO = 
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struct 
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(** thy database **) 
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(* messages *) 
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fun gen_msg txt [] = txt 
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 gen_msg txt names = txt ^ " " ^ commas_quote names; 
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fun loader_msg txt names = gen_msg ("Theory loader: " ^ txt) names; 
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val show_path = space_implode " via " o map quote; 
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fun cycle_msg name names = loader_msg ("cyclic dependency of " ^ show_path (name :: names)) []; 
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(* derived graph operations *) 
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fun add_deps name parents G = 
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foldl (fn (H, parent) => Graph.add_edge_acyclic (parent, name) H) (G, parents) 
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handle Graph.CYCLES namess => error (cat_lines (map (cycle_msg name) namess)); 
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fun del_deps name G = 
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foldl (fn (H, parent) => Graph.del_edge (parent, name) H) (G, Graph.imm_preds G name); 
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fun update_node name parents entry G = 
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add_deps name parents 
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(if can (Graph.get_node G) name then del_deps name G else Graph.new_node (name, entry) G); 
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(* thy database *) 
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type deps = 
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{present: bool, outdated: bool, 
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master: (Path.T * File.info) list, files: (Path.T * (Path.T * File.info) option) list}; 
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fun make_deps present outdated master files = 
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{present = present, outdated = outdated, master = master, files = files}: deps; 

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type thy = deps option * theory option; 
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local 
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val database = ref (Graph.empty: thy Graph.T); 
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in 
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fun get_thys () = ! database; 
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fun change_thys f = database := (f (! database)); 

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end; 
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(* access thy graph *) 
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fun thy_graph f x = f (get_thys ()) x; 
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fun get_names () = Graph.keys (get_thys ()); 
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(* access thy *) 
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fun lookup_thy name = Some (thy_graph Graph.get_node name) handle Graph.UNDEFINED _ => None; 
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fun get_thy name = 
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(case lookup_thy name of 
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Some thy => thy 
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 None => error (loader_msg "nothing known about theory" [name])); 
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fun change_thy name f = (get_thy name; change_thys (Graph.map_node name f)); 
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(* access deps *) 
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val lookup_deps = apsome #1 o lookup_thy; 
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val get_deps = #1 o get_thy; 
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fun change_deps name f = change_thy name (fn (deps, x) => (f deps, x)); 
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fun is_finished name = is_none (get_deps name); 
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fun get_files name = (case get_deps name of Some {files, ...} => files  _ => []); 
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val loaded_files = mapfilter #2 o get_files; 
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fun get_preds name = 
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(thy_graph Graph.imm_preds name) handle Graph.UNDEFINED _ => 

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error (loader_msg "nothing known about theory" [name]); 

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(* access theory *) 
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fun get_theory name = 
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(case get_thy name of 
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(_, Some theory) => theory 
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 _ => error (loader_msg "undefined theory entry for" [name])); 
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val theory_of_sign = get_theory o Sign.name_of; 
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val theory_of_thm = theory_of_sign o Thm.sign_of_thm; 
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fun put_theory theory = 
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change_thy (PureThy.get_name theory) (fn (deps, _) => (deps, Some theory)); 
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(** thy operations **) 
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(* maintain 'outdated' flag *) 
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fun is_outdated name = 
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(case lookup_deps name of 

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Some (Some {outdated, ...}) => outdated 

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 _ => false); 

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fun outdate_thy name = 
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if is_finished name then () 
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else change_deps name (apsome (fn {present, outdated = _, master, files} => 
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make_deps present true master files)); 

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fun touch_thy name = 
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if is_outdated name then () 

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else if is_finished name then warning (loader_msg "tried to touch finished theory" [name]) 
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else 
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(case filter_out is_outdated (thy_graph Graph.all_succs [name]) \ name of 

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[] => outdate_thy name 

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 names => 

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(warning (loader_msg "the following theories become outofdate:" names); 

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seq outdate_thy names; outdate_thy name)); 

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val untouch_deps = apsome (fn {present, outdated = _, master, files}: deps => 

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make_deps present false master files); 

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(* load_thy *) 
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fun required_by [] = "" 
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 required_by initiators = " (required by " ^ show_path (rev initiators) ^ ")"; 
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fun load_thy ml time initiators dir name parents = 
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let 
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val _ = if name mem_string initiators then error (cycle_msg name (rev initiators)) else (); 
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val _ = writeln ("Loading theory " ^ quote name ^ required_by initiators); 
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val _ = seq touch_thy (thy_graph Graph.all_succs [name]); 
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val master = ThyLoad.load_thy dir name ml time; 
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val files = get_files name; 
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val missing_files = mapfilter (fn (path, None) => Some (Path.pack path)  _ => None) files; 
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in 
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if null missing_files then () 
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else warning (loader_msg "unresolved dependencies of theory" [name] ^ 
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"\nfile(s): " ^ commas_quote missing_files); 

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change_deps name (fn _ => Some (make_deps true false master files)) 
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end; 
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(* load_file *) 
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fun run_file path = 
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let 
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fun provide name info (deps as Some {present, outdated, master, files}) = 
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if exists (equal path o #1) files then 
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Some (make_deps present outdated master (overwrite (files, (path, Some info)))) 
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else (warning (loader_msg "undeclared dependency of theory" [name] ^ 

6389  197 
" on file: " ^ quote (Path.pack path)); deps) 
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 provide _ _ None = None; 
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in 
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(case apsome PureThy.get_name (Context.get_context ()) of 
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None => (ThyLoad.load_file path; ()) 
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 Some name => 
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if is_some (lookup_thy name) then change_deps name (provide name (ThyLoad.load_file path)) 
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else (ThyLoad.load_file path; ())) 
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end; 
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6241  207 
fun load_file false path = run_file path 
208 
 load_file true path = 

209 
let val name = Path.pack path in 

210 
timeit (fn () => 

211 
(writeln ("\n**** Starting file " ^ quote name ^ " ****"); 

212 
run_file path; 

213 
writeln ("**** Finished file " ^ quote name ^ " ****\n"))) 

214 
end; 

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6329  216 
val use_path = load_file false; 
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val use = use_path o Path.unpack; 

6241  218 
val time_use = load_file true o Path.unpack; 
6233  219 

220 

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(* require_thy *) 
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6241  223 
fun init_deps master files = Some (make_deps false false master (map (rpair None) files)); 
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fun load_deps dir name ml = 
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let val (master, (parents, files)) = ThyLoad.deps_thy dir name ml 
6233  227 
in (Some (init_deps master files), parents) end; 
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fun file_current (_, None) = false 
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 file_current (path, info) = info = ThyLoad.check_file path; 
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fun current_deps ml strict dir name = 
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(case lookup_deps name of 
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None => (false, load_deps dir name ml) 
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 Some deps => 
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let val same_deps = (None, thy_graph Graph.imm_preds name) in 
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(case deps of 
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None => (true, same_deps) 
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 Some {present, outdated, master, files} => 
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if present andalso not strict then (true, same_deps) 
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else 
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let val master' = ThyLoad.check_thy dir name ml in 
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if master <> master' then (false, load_deps dir name ml) 
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else (not outdated andalso forall file_current files, same_deps) 
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end) 
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end); 
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6487  248 
fun require_thy ml time strict keep_strict initiators prfx s = 
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let 
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val path = Path.expand (Path.unpack s); 
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val name = Path.pack (Path.base path); 
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val dir = Path.append prfx (Path.dir path); 
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val require_parent = 
6487  255 
#1 o require_thy ml time (strict andalso keep_strict) keep_strict (name :: initiators) dir; 
256 
val (current, (new_deps, parents)) = current_deps ml strict dir name handle ERROR => 

6241  257 
error (loader_msg "The error(s) above occurred while examining theory" [name] ^ 
258 
(if null initiators then "" else "\n" ^ required_by initiators)); 

6233  259 
val parents_current = map require_parent parents; 
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val result = 
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if current andalso forall I parents_current then true 
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else 
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((case new_deps of 
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Some deps => change_thys (update_node name parents (untouch_deps deps, None)) 
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 None => ()); 
6487  267 
load_thy ml time initiators dir name parents; 
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false); 
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in (result, name) end; 
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6487  271 
fun gen_use_thy f s = 
272 
let val (_, name) = f Path.current s in Context.context (get_theory name) end; 

6241  273 

274 
val weak_use_thy = gen_use_thy (require_thy true false false false []); 

275 
val use_thy = gen_use_thy (require_thy true false true false []); 

276 
val update_thy = gen_use_thy (require_thy true false true true []); 

277 
val time_use_thy = gen_use_thy (require_thy true true true false []); 

278 
val use_thy_only = gen_use_thy (require_thy false false true false []); 

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6666  281 
(* remove_thy *) 
282 

283 
fun remove_thy name = 

284 
if is_finished name then error (loader_msg "cannot remove finished theory" [name]) 

285 
else 

286 
let val succs = thy_graph Graph.all_succs [name] in 

287 
writeln (loader_msg "removing" succs); 

288 
change_thys (Graph.del_nodes succs) 

289 
end; 

290 

291 

6329  292 
(* begin / end theory *) (* FIXME tune *) (* FIXME files vs. paths (!?!?) *) 
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6329  294 
fun begin_theory name parents paths = 
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let 
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val _ = (map Path.basic parents; seq weak_use_thy parents); 
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val theory = PureThy.begin_theory name (map get_theory parents); 
6362  298 
val _ = change_thys (update_node name parents (init_deps [] [], Some theory)); 
6329  299 
val use_paths = mapfilter (fn (x, true) => Some x  _ => None) paths; 
300 
in Context.setmp (Some theory) (seq use_path) use_paths; theory end; 

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fun end_theory theory = 
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let val theory' = PureThy.end_theory theory 
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in put_theory theory'; theory' end; 
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6666  307 
(* finish all theories *) 
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6666  309 
fun finish () = change_thys (Graph.map_nodes (fn (_, entry) => (None, entry))); 
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(* register existing theories *) 
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fun register_theory theory = 
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let 
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val name = PureThy.get_name theory; 
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val parents = Theory.parents_of theory; 
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val parent_names = map PureThy.get_name parents; 
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fun err txt bads = 
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error (loader_msg txt bads ^ "\n" ^ gen_msg "cannot register theory" [name]); 
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6666  323 
val nonfinished = filter_out is_finished parent_names; 
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fun get_variant (x, y_name) = 
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if Theory.eq_thy (x, get_theory y_name) then None 
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else Some y_name; 
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val variants = mapfilter get_variant (parents ~~ parent_names); 
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fun register G = 
6362  330 
(Graph.new_node (name, (None, Some theory)) G 
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handle Graph.DUPLICATE _ => err "duplicate theory entry" []) 
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> add_deps name parent_names; 
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in 
6666  334 
if not (null nonfinished) then err "nonfinished parent theories" nonfinished 
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else if not (null variants) then err "different versions of parent theories" variants 
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else change_thys register 
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end; 
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(*final declarations of this structure*) 
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val theory = get_theory; 
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val names = get_names; 
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end; 
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345 

5209  346 
structure BasicThyInfo: BASIC_THY_INFO = ThyInfo; 
347 
open BasicThyInfo; 