author  wenzelm 
Tue, 24 Jun 2008 19:43:19 +0200  
changeset 27343  4b28b80dd1f8 
parent 26881  bb68f50644a9 
child 27359  54b5367a827a 
permissions  rwrr 
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(* Title: Pure/ML/ml_context.ML 
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ID: $Id$ 
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Author: Makarius 

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ML context and antiquotations. 

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*) 

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signature BASIC_ML_CONTEXT = 

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sig 

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val bind_thm: string * thm > unit 
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val bind_thms: string * thm list > unit 
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val thm: xstring > thm 
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val thms: xstring > thm list 

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end 
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signature ML_CONTEXT = 

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sig 

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include BASIC_ML_CONTEXT 

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val the_generic_context: unit > Context.generic 

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val the_global_context: unit > theory 
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val the_local_context: unit > Proof.context 
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val exec: (unit > unit) > Context.generic > Context.generic 
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val stored_thms: thm list ref 
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val ml_store_thm: string * thm > unit 
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val ml_store_thms: string * thm list > unit 
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val add_keywords: string list > unit 
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type antiq = 
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{struct_name: string, background: Proof.context} > 
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(Proof.context > string * string) * Proof.context 
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val add_antiq: string > 
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(Context.generic * Args.T list > antiq * (Context.generic * Args.T list)) > unit 
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val trace: bool ref 
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val eval: bool > Position.T > string > unit 
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val eval_file: Path.T > unit 

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val eval_in: Context.generic option > bool > Position.T > string > unit 

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val evaluate: (string > unit) * (string > 'b) > bool > 
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string * (unit > 'a) option ref > string > 'a 

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val expression: Position.T > string > string > string > Context.generic > Context.generic 
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end 
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structure ML_Context: ML_CONTEXT = 

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struct 

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(** implicit ML context **) 
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val the_generic_context = Context.the_thread_data; 
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val the_global_context = Context.theory_of o the_generic_context; 
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val the_local_context = Context.proof_of o the_generic_context; 
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fun exec (e: unit > unit) context = 
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(case Context.setmp_thread_data (SOME context) (fn () => (e (); Context.thread_data ())) () of 

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SOME context' => context' 

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 NONE => error "Missing context after execution"); 

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(* theorem bindings *) 
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val stored_thms: thm list ref = ref []; 
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fun ml_store sel (name, ths) = 
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let 
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val ths' = Context.>>> (Context.map_theory_result (PureThy.store_thms (name, ths))); 
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val _ = 
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if name = "" then () 
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else if not (ML_Syntax.is_identifier name) then 
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error ("Cannot bind theorem(s) " ^ quote name ^ " as ML value") 
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else setmp stored_thms ths' (fn () => 
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use_text (0, "") Output.ml_output true 
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("val " ^ name ^ " = " ^ sel ^ "(! ML_Context.stored_thms);")) (); 
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in () end; 
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val ml_store_thms = ml_store ""; 
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fun ml_store_thm (name, th) = ml_store "hd" (name, [th]); 
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fun bind_thm (name, thm) = ml_store_thm (name, Drule.standard thm); 
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fun bind_thms (name, thms) = ml_store_thms (name, map Drule.standard thms); 
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fun thm name = ProofContext.get_thm (the_local_context ()) name; 
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fun thms name = ProofContext.get_thms (the_local_context ()) name; 
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(** ML antiquotations **) 

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(* antiquotation keywords *) 
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local 
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val global_lexicon = ref Scan.empty_lexicon; 

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in 
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fun add_keywords keywords = CRITICAL (fn () => 
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change global_lexicon (Scan.extend_lexicon (map Symbol.explode keywords))); 

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fun get_lexicon () = ! global_lexicon; 
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end; 

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(* antiquotation commands *) 
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type antiq = 
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{struct_name: string, background: Proof.context} > 
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(Proof.context > string * string) * Proof.context; 
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local 
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val global_parsers = ref (Symtab.empty: 
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(Context.generic * Args.T list > antiq * (Context.generic * Args.T list)) Symtab.table); 
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in 
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fun add_antiq name scan = CRITICAL (fn () => 
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change global_parsers (fn tab => 
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(if not (Symtab.defined tab name) then () 
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else warning ("Redefined ML antiquotation: " ^ quote name); 
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Symtab.update (name, scan) tab))); 
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fun antiquotation src ctxt = 
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let val ((name, _), pos) = Args.dest_src src in 
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(case Symtab.lookup (! global_parsers) name of 

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NONE => error ("Unknown ML antiquotation command: " ^ quote name ^ Position.str_of pos) 

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 SOME scan => Args.context_syntax "ML antiquotation" scan src ctxt) 
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end; 
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end; 
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(* parsing and evaluation *) 
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local 
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structure P = OuterParse; 
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val antiq = 

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P.!!! (P.position P.xname  P.arguments  Scan.ahead P.eof) 

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>> (fn ((x, pos), y) => Args.src ((x, y), pos)); 

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fun eval_antiquotes struct_name (txt, pos) opt_ctxt = 
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let 
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val ants = Antiquote.scan_antiquotes (txt, pos); 
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val ((ml_env, ml_body), opt_ctxt') = 
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if not (exists Antiquote.is_antiq ants) then (("", Symbol.escape txt), opt_ctxt) 
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else 
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let 
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val ctxt = 
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(case opt_ctxt of 
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NONE => error ("Unknown context  cannot expand ML antiquotations" ^ 
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Position.str_of pos) 
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 SOME context => Context.proof_of context); 
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val lex = get_lexicon (); 
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fun no_decl _ = ("", ""); 
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fun expand (Antiquote.Text s) state = (K ("", Symbol.escape s), state) 
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 expand (Antiquote.Antiq x) (scope, background) = 
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let 
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val context = Stack.top scope; 
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val (f, context') = antiquotation (Antiquote.scan_arguments lex antiq x) context; 
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val (decl, background') = f {background = background, struct_name = struct_name}; 
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in (decl, (Stack.map_top (K context') scope, background')) end 
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 expand (Antiquote.Open _) (scope, background) = 
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(no_decl, (Stack.push scope, background)) 
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 expand (Antiquote.Close _) (scope, background) = 
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(no_decl, (Stack.pop scope, background)); 
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val (decls, (_, ctxt')) = fold_map expand ants (Stack.init ctxt, ctxt); 
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val ml = decls > map (fn decl => decl ctxt') > split_list > pairself implode; 
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in (ml, SOME (Context.Proof ctxt')) end; 
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in (("structure " ^ struct_name ^ " =\nstruct\n" ^ ml_env ^ "end;", ml_body), opt_ctxt') end; 
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in 

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val trace = ref false; 

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fun eval_wrapper pr verbose pos txt = 
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let 
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val struct_name = 
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if Multithreading.available then "Isabelle" ^ serial_string () 
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else "Isabelle"; 
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val ((env, body), env_ctxt) = eval_antiquotes struct_name (txt, pos) (Context.thread_data ()); 
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val _ = if ! trace then tracing (cat_lines [env, body]) else (); 
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fun eval_raw p = 
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use_text (the_default 1 (Position.line_of p), the_default "ML" (Position.file_of p)) pr; 
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in 
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Context.setmp_thread_data env_ctxt (fn () => eval_raw Position.none false env) (); 
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NAMED_CRITICAL "ML" (fn () => eval_raw pos verbose body); (* FIXME noncritical with local ML env *) 
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forget_structure struct_name 
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end; 
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end; 

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(* ML evaluation *) 

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val eval = eval_wrapper Output.ml_output; 
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fun eval_file path = eval true (Path.position path) (File.read path); 
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fun eval_in context verbose pos txt = 
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Context.setmp_thread_data context (fn () => eval verbose pos txt) (); 

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fun evaluate pr verbose (ref_name, r) txt = NAMED_CRITICAL "ML" (fn () => 
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let 
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val _ = r := NONE; 

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val _ = eval_wrapper pr verbose Position.none 
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("val _ = (" ^ ref_name ^ " := SOME (fn () => " ^ txt ^ "))"); 
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in (case ! r of NONE => error ("Bad evaluation for " ^ ref_name)  SOME e => e) end) (); 
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fun expression pos bind body txt = 
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exec (fn () => eval false pos 

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("Context.set_thread_data (SOME (let " ^ bind ^ " = " ^ txt ^ " in " ^ body ^ 

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" end (ML_Context.the_generic_context ())));")); 

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end; 
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structure Basic_ML_Context: BASIC_ML_CONTEXT = ML_Context; 

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open Basic_ML_Context; 