(* Title: Pure/ML/ml_context.ML
ID: $Id$
Author: Makarius
ML context and antiquotations.
*)
signature BASIC_ML_CONTEXT =
sig
val bind_thm: string * thm -> unit
val bind_thms: string * thm list -> unit
val thm: xstring -> thm
val thms: xstring -> thm list
end
signature ML_CONTEXT =
sig
include BASIC_ML_CONTEXT
val the_generic_context: unit -> Context.generic
val the_global_context: unit -> theory
val the_local_context: unit -> Proof.context
val exec: (unit -> unit) -> Context.generic -> Context.generic
val stored_thms: thm list ref
val ml_store_thm: string * thm -> unit
val ml_store_thms: string * thm list -> unit
type antiq =
{struct_name: string, background: Proof.context} ->
(Proof.context -> string * string) * Proof.context
val add_antiq: string ->
(Position.T -> Context.generic * Args.T list -> antiq * (Context.generic * Args.T list)) -> unit
val trace: bool ref
val eval_wrapper: (string -> unit) * (string -> 'a) -> bool -> Position.T -> string -> unit
val eval: bool -> Position.T -> string -> unit
val eval_file: Path.T -> unit
val eval_in: Context.generic option -> bool -> Position.T -> string -> unit
val evaluate: (string -> unit) * (string -> 'b) -> bool ->
string * (unit -> 'a) option ref -> string -> 'a
val expression: Position.T -> string -> string -> string -> Context.generic -> Context.generic
end
structure ML_Context: ML_CONTEXT =
struct
(** implicit ML context **)
val the_generic_context = Context.the_thread_data;
val the_global_context = Context.theory_of o the_generic_context;
val the_local_context = Context.proof_of o the_generic_context;
fun exec (e: unit -> unit) context =
(case Context.setmp_thread_data (SOME context) (fn () => (e (); Context.thread_data ())) () of
SOME context' => context'
| NONE => error "Missing context after execution");
(* theorem bindings *)
val stored_thms: thm list ref = ref [];
fun ml_store sel (name, ths) =
let
val ths' = Context.>>> (Context.map_theory_result (PureThy.store_thms (name, ths)));
val _ =
if name = "" then ()
else if not (ML_Syntax.is_identifier name) then
error ("Cannot bind theorem(s) " ^ quote name ^ " as ML value")
else setmp stored_thms ths' (fn () =>
use_text (0, "") Output.ml_output true
("val " ^ name ^ " = " ^ sel ^ "(! ML_Context.stored_thms);")) ();
in () end;
val ml_store_thms = ml_store "";
fun ml_store_thm (name, th) = ml_store "hd" (name, [th]);
fun bind_thm (name, thm) = ml_store_thm (name, Drule.standard thm);
fun bind_thms (name, thms) = ml_store_thms (name, map Drule.standard thms);
fun thm name = ProofContext.get_thm (the_local_context ()) name;
fun thms name = ProofContext.get_thms (the_local_context ()) name;
(** ML antiquotations **)
(* antiquotation commands *)
type antiq =
{struct_name: string, background: Proof.context} ->
(Proof.context -> string * string) * Proof.context;
local
val global_parsers = ref (Symtab.empty:
(Position.T -> Context.generic * Args.T list -> antiq * (Context.generic * Args.T list))
Symtab.table);
in
fun add_antiq 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) tab)));
fun antiquotation src ctxt =
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 => Args.context_syntax "ML antiquotation" (scan pos) src ctxt)
end;
end;
(* parsing and evaluation *)
local
structure P = OuterParse;
val antiq =
P.!!! (P.position P.xname -- Args.parse --| Scan.ahead P.eof)
>> (fn ((x, pos), y) => Args.src ((x, y), pos));
fun eval_antiquotes struct_name (txt, pos) opt_ctxt =
let
val ants = Antiquote.read (txt, pos);
val ((ml_env, ml_body), opt_ctxt') =
if not (exists Antiquote.is_antiq ants) then (("", Symbol.escape txt), opt_ctxt)
else
let
val ctxt =
(case opt_ctxt of
NONE => error ("Unknown context -- cannot expand ML antiquotations" ^
Position.str_of pos)
| SOME context => Context.proof_of context);
val lex = #1 (OuterKeyword.get_lexicons ());
fun no_decl _ = ("", "");
fun expand (Antiquote.Text s) state = (K ("", Symbol.escape s), state)
| expand (Antiquote.Antiq x) (scope, background) =
let
val context = Stack.top scope;
val (f, context') = antiquotation (Antiquote.read_antiq lex antiq x) context;
val (decl, background') = f {background = background, struct_name = struct_name};
in (decl, (Stack.map_top (K context') scope, background')) end
| expand (Antiquote.Open _) (scope, background) =
(no_decl, (Stack.push scope, background))
| expand (Antiquote.Close _) (scope, background) =
(no_decl, (Stack.pop scope, background));
val (decls, (_, ctxt')) = fold_map expand ants (Stack.init ctxt, ctxt);
val ml = decls |> map (fn decl => decl ctxt') |> split_list |> pairself implode;
in (ml, SOME (Context.Proof ctxt')) end;
in (("structure " ^ struct_name ^ " =\nstruct\n" ^ ml_env ^ "end;", ml_body), opt_ctxt') end;
in
val trace = ref false;
fun eval_wrapper pr verbose pos txt =
let
val struct_name =
if Multithreading.available then "Isabelle" ^ serial_string ()
else "Isabelle";
val ((env, body), env_ctxt) = eval_antiquotes struct_name (txt, pos) (Context.thread_data ());
val _ = if ! trace then tracing (cat_lines [env, body]) else ();
fun eval_raw p =
use_text (the_default 1 (Position.line_of p), the_default "ML" (Position.file_of p)) pr;
in
Context.setmp_thread_data env_ctxt (fn () => eval_raw Position.none false env) ();
NAMED_CRITICAL "ML" (fn () => eval_raw pos verbose body); (* FIXME non-critical with local ML env *)
forget_structure struct_name
end;
end;
(* ML evaluation *)
val eval = eval_wrapper Output.ml_output;
fun eval_file path = eval true (Path.position path) (File.read path);
fun eval_in context verbose pos txt =
Context.setmp_thread_data context (fn () => eval verbose pos txt) ();
fun evaluate pr verbose (ref_name, r) txt = NAMED_CRITICAL "ML" (fn () =>
let
val _ = r := NONE;
val _ = eval_wrapper pr verbose Position.none
("val _ = (" ^ ref_name ^ " := SOME (fn () => " ^ txt ^ "))");
in (case ! r of NONE => error ("Bad evaluation for " ^ ref_name) | SOME e => e) end) ();
fun expression pos bind body txt =
exec (fn () => eval false pos
("Context.set_thread_data (SOME (let " ^ bind ^ " = " ^ txt ^ " in " ^ body ^
" end (ML_Context.the_generic_context ())));"));
end;
structure Basic_ML_Context: BASIC_ML_CONTEXT = ML_Context;
open Basic_ML_Context;