diff -r 5bbdc9b60648 -r e840872e9c7c src/Pure/ML/ml_context.ML
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/ML/ml_context.ML	Fri Sep 14 17:02:34 2007 +0200
@@ -0,0 +1,273 @@
+(*  Title:      Pure/Thy/ml_context.ML
+    ID:         $Id$
+    Author:     Makarius
+
+ML context and antiquotations.
+*)
+
+signature BASIC_ML_CONTEXT =
+sig
+  val the_context: unit -> theory
+  val thm: xstring -> thm
+  val thms: xstring -> thm list
+end;
+
+signature ML_CONTEXT =
+sig
+  include BASIC_ML_CONTEXT
+  val get_context: unit -> Context.generic option
+  val set_context: Context.generic option -> unit
+  val setmp: Context.generic option -> ('a -> 'b) -> 'a -> 'b
+  val the_generic_context: unit -> Context.generic
+  val the_local_context: unit -> Proof.context
+  val pass: Context.generic option -> ('a -> 'b) -> 'a -> 'b * Context.generic option
+  val pass_context: Context.generic -> ('a -> 'b) -> 'a -> 'b * Context.generic
+  val save: ('a -> 'b) -> 'a -> 'b
+  val >> : (theory -> theory) -> unit
+  val add_keywords: string list -> unit
+  val inline_antiq: string ->
+    (Context.generic * Args.T list -> string * (Context.generic * Args.T list)) -> unit
+  val value_antiq: string ->
+    (Context.generic * Args.T list -> (string * string) * (Context.generic * Args.T list)) -> unit
+  val proj_value_antiq: string -> (Context.generic * Args.T list ->
+      (string * string * string) * (Context.generic * Args.T list)) -> unit
+  val eval_antiquotes_fn: (string -> string * string) ref  (* FIXME tmp *)
+  val trace: bool ref
+  val use_mltext: string -> bool -> Context.generic option -> unit
+  val use_mltext_update: string -> bool -> Context.generic -> Context.generic
+  val use_let: string -> string -> string -> Context.generic -> Context.generic
+  val use: Path.T -> unit
+end;
+
+structure ML_Context: ML_CONTEXT =
+struct
+
+(** Implicit ML context **)
+
+local
+  val current_context = ref (NONE: Context.generic option);
+in
+  fun get_context () = ! current_context;
+  fun set_context opt_context = current_context := opt_context;
+  fun setmp opt_context f x = Library.setmp current_context opt_context f x;
+end;
+
+fun the_generic_context () =
+  (case get_context () of
+    SOME context => context
+  | _ => error "Unknown context");
+
+val the_local_context = Context.proof_of o the_generic_context;
+
+val the_context = Context.theory_of o the_generic_context;
+
+fun pass opt_context f x =
+  setmp opt_context (fn x => let val y = f x in (y, get_context ()) end) x;
+
+fun pass_context context f x =
+  (case pass (SOME context) f x of
+    (y, SOME context') => (y, context')
+  | (_, NONE) => error "Lost context in ML");
+
+fun save f x = CRITICAL (fn () => setmp (get_context ()) f x);
+
+fun change_theory f = CRITICAL (fn () =>
+  set_context (SOME (Context.map_theory f (the_generic_context ()))));
+
+
+
+(** ML antiquotations **)
+
+(* maintain keywords *)
+
+val global_lexicon = ref Scan.empty_lexicon;
+
+fun add_keywords keywords = CRITICAL (fn () =>
+  change global_lexicon (Scan.extend_lexicon (map Symbol.explode keywords)));
+
+
+(* maintain commands *)
+
+datatype antiq = Inline of string | ProjValue of string * string * string;
+val global_parsers = ref (Symtab.empty:
+  (Context.generic * Args.T list -> antiq * (Context.generic * Args.T list)) Symtab.table);
+
+local
+
+fun add_item kind name scan = CRITICAL (fn () =>
+  change global_parsers (fn tab =>
+   (if not (Symtab.defined tab name) then ()
+    else warning ("Redefined ML antiquotation: " ^ quote name);
+    Symtab.update (name, scan >> kind) tab)));
+
+in
+
+val inline_antiq = add_item Inline;
+val proj_value_antiq = add_item ProjValue;
+fun value_antiq name scan = proj_value_antiq name (scan >> (fn (a, s) => (a, s, "")));
+
+end;
+
+
+(* command syntax *)
+
+fun syntax scan src =
+  #1 (Args.context_syntax "ML antiquotation" scan src (the_local_context ()));
+
+fun command src =
+  let val ((name, _), pos) = Args.dest_src src in
+    (case Symtab.lookup (! global_parsers) name of
+      NONE => error ("Unknown ML antiquotation command: " ^ quote name ^ Position.str_of pos)
+    | SOME scan => syntax scan src)
+  end;
+
+
+(* outer syntax *)
+
+structure T = OuterLex;
+structure P = OuterParse;
+
+val antiq =
+  P.!!! (P.position P.xname -- P.arguments --| Scan.ahead P.eof)
+  >> (fn ((x, pos), y) => Args.src ((x, y), pos));
+
+
+(* input/output wrappers *)
+
+local
+
+val isabelle_struct = enclose "structure Isabelle =\nstruct\n" "end;";
+val isabelle_struct0 = isabelle_struct "";
+
+fun eval_antiquotes txt = CRITICAL (fn () =>
+  let
+    val ants = Antiquote.scan_antiquotes (txt, Position.line 1);
+
+    fun expand (Antiquote.Text s) names = (("", Symbol.escape s), names)
+      | expand (Antiquote.Antiq x) names =
+          (case command (Antiquote.scan_arguments (! global_lexicon) antiq x) of
+            Inline s => (("", s), names)
+          | ProjValue (a, s, f) =>
+              let
+                val a' = if ML_Syntax.is_identifier a then a else "val";
+                val ([b], names') = Name.variants [a'] names;
+                val binding = "val " ^ b ^ " = " ^ s ^ ";\n";
+                val value =
+                  if f = "" then "Isabelle." ^ b
+                  else "(" ^ f ^ " Isabelle." ^ b ^ ")";
+              in ((binding, value), names') end);
+
+    val (decls, body) =
+      fold_map expand ants ML_Syntax.reserved
+      |> #1 |> split_list |> pairself implode;
+  in (isabelle_struct decls, body) end);
+
+fun eval name verbose txt = use_text name Output.ml_output verbose txt;
+
+in
+
+val eval_antiquotes_fn = ref eval_antiquotes;
+
+val trace = ref false;
+
+fun eval_wrapper name verbose txt =
+  let
+    val (txt1, txt2) = ! eval_antiquotes_fn txt;
+    val _ = if ! trace then tracing (cat_lines [txt1, txt2]) else ();
+  in eval "" false txt1; eval name verbose txt2; eval "" false isabelle_struct0 end;
+
+end;
+
+
+(* ML evaluation *)
+
+fun use_mltext txt verbose opt_context =
+  setmp opt_context (fn () => eval_wrapper "ML" verbose txt) ();
+
+fun use_mltext_update txt verbose context =
+  #2 (pass_context context (eval_wrapper "ML" verbose) txt);
+
+fun use_context txt = use_mltext_update
+  ("ML_Context.set_context (SOME ((" ^ txt ^ ") (ML_Context.the_generic_context ())));") false;
+
+fun use_let bind body txt =
+  use_context ("let " ^ bind ^ " = " ^ txt ^ " in\n" ^ body ^ " end");
+
+fun use path = eval_wrapper (Path.implode path) true (File.read path);
+
+
+(* basic antiquotations *)
+
+val _ = value_antiq "context" (Scan.succeed ("context", "ML_Context.the_local_context ()"));
+
+val _ = inline_antiq "typ" (Args.typ >> (ML_Syntax.atomic o ML_Syntax.print_typ));
+val _ = inline_antiq "term" (Args.term >> (ML_Syntax.atomic o ML_Syntax.print_term));
+val _ = inline_antiq "prop" (Args.prop >> (ML_Syntax.atomic o ML_Syntax.print_term));
+
+val _ = value_antiq "ctyp" (Args.typ >> (fn T =>
+  ("ctyp",
+    "Thm.ctyp_of (ML_Context.the_context ()) " ^ ML_Syntax.atomic (ML_Syntax.print_typ T))));
+
+val _ = value_antiq "cterm" (Args.term >> (fn t =>
+  ("cterm",
+    "Thm.cterm_of (ML_Context.the_context ()) " ^ ML_Syntax.atomic (ML_Syntax.print_term t))));
+
+val _ = value_antiq "cprop" (Args.prop >> (fn t =>
+  ("cprop",
+    "Thm.cterm_of (ML_Context.the_context ()) " ^ ML_Syntax.atomic (ML_Syntax.print_term t))));
+
+
+fun const syn = (Scan.state >> Context.proof_of) -- Scan.lift Args.name >> (fn (ctxt, c) =>
+  #1 (Term.dest_Const (Consts.read_const (ProofContext.consts_of ctxt) c))
+  |> syn ? ProofContext.const_syntax_name ctxt
+  |> ML_Syntax.print_string);
+
+val _ = inline_antiq "const_name" (const false);
+val _ = inline_antiq "const_syntax" (const true);
+
+
+
+(** fact references **)
+
+fun thm name = ProofContext.get_thm (the_local_context ()) (Name name);
+fun thms name = ProofContext.get_thms (the_local_context ()) (Name name);
+
+
+local
+
+fun print_interval (FromTo arg) =
+      "PureThy.FromTo " ^ ML_Syntax.print_pair ML_Syntax.print_int ML_Syntax.print_int arg
+  | print_interval (From i) = "PureThy.From " ^ ML_Syntax.print_int i
+  | print_interval (Single i) = "PureThy.Single " ^ ML_Syntax.print_int i;
+
+fun thm_sel name =
+  Args.thm_sel >> (fn is => "PureThy.NameSelection " ^
+    ML_Syntax.print_pair ML_Syntax.print_string (ML_Syntax.print_list print_interval) (name, is))
+  || Scan.succeed ("PureThy.Name " ^ ML_Syntax.print_string name);
+
+fun thm_antiq kind = value_antiq kind
+  (Scan.lift (Args.name :-- thm_sel) >> apsnd (fn sel =>
+    "ProofContext.get_" ^ kind ^ " (ML_Context.the_local_context ()) " ^ ML_Syntax.atomic sel));
+
+in
+
+val _ = add_keywords ["(", ")", "-", ","];
+val _ = thm_antiq "thm";
+val _ = thm_antiq "thms";
+
+end;
+
+val _ = proj_value_antiq "cpat" (Scan.lift Args.name >> 
+      (fn ns => ("cpat", 
+      "((cterm_of (ML_Context.the_context ())) o Library.the_single o " ^ 
+      "(ProofContext.read_term_pats TypeInfer.logicT (ML_Context.the_local_context ())))"
+      ^ (ML_Syntax.print_list ML_Syntax.print_string [ns]), "")));
+
+(*final declarations of this structure!*)
+nonfix >>;
+fun >> f = change_theory f;
+
+end;
+
+structure Basic_ML_Context: BASIC_ML_CONTEXT = ML_Context;
+open Basic_ML_Context;