src/Pure/Thy/term_style.ML
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(*  Title:      Pure/Thy/term_style.ML
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    Author:     Florian Haftmann, TU Muenchen
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Styles for term printing.
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*)
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signature TERM_STYLE =
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sig
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  val setup: string -> (Proof.context -> term -> term) parser -> theory -> theory
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  val parse: (term -> term) context_parser
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  val parse_bare: (term -> term) context_parser
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end;
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structure Term_Style: TERM_STYLE =
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struct
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(* style data *)
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fun err_dup_style name =
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  error ("Duplicate declaration of antiquote style: " ^ quote name);
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structure Styles = Theory_Data
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(
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  type T = ((Proof.context -> term -> term) parser * stamp) Symtab.table;
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  val empty = Symtab.empty;
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  val extend = I;
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  fun merge data : T = Symtab.merge (eq_snd (op =)) data
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    handle Symtab.DUP dup => err_dup_style dup;
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);
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(* accessors *)
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fun the_style thy name =
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  (case Symtab.lookup (Styles.get thy) name of
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    NONE => error ("Unknown antiquote style: " ^ quote name)
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  | SOME (style, _) => style);
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fun setup name style thy =
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  Styles.map (Symtab.update_new (name, (style, stamp ()))) thy
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    handle Symtab.DUP _ => err_dup_style name;
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(* style parsing *)
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fun parse_single ctxt = Parse.position (Parse.xname -- Args.parse)
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  >> (fn x as ((name, _), _) => fst (Args.context_syntax "style"
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       (Scan.lift (the_style (ProofContext.theory_of ctxt) name))
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         (Args.src x) ctxt |>> (fn f => f ctxt)));
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val parse = Args.context :|-- (fn ctxt => Scan.lift 
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  (Args.parens (parse_single ctxt ::: Scan.repeat (Args.$$$ "," |-- parse_single ctxt))
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      >> fold I
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  || Scan.succeed I));
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val parse_bare = Args.context :|-- (fn ctxt => (Output.legacy_feature "Old-style antiquotation style.";
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  Scan.lift Args.liberal_name
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  >> (fn name => fst (Args.context_syntax "style"
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       (Scan.lift (the_style (ProofContext.theory_of ctxt) name))
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          (Args.src (("style", []), Position.none)) ctxt |>> (fn f => f ctxt)))));
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(* predefined styles *)
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fun style_lhs_rhs proj = Scan.succeed (fn ctxt => fn t =>
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  let
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    val concl =
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      Object_Logic.drop_judgment (ProofContext.theory_of ctxt) (Logic.strip_imp_concl t)
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  in
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    case concl of (_ $ l $ r) => proj (l, r)
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    | _ => error ("Binary operator expected in term: " ^ Syntax.string_of_term ctxt concl)
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  end);
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val style_prem = Args.name >> (fn raw_i => fn ctxt => fn t =>
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  let
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    val i = (the o Int.fromString) raw_i;
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    val prems = Logic.strip_imp_prems t;
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  in
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    if i <= length prems then nth prems (i - 1)
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    else error ("Not enough premises for prem " ^ string_of_int i ^
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      " in propositon: " ^ Syntax.string_of_term ctxt t)
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  end);
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fun style_parm_premise i = Scan.succeed (fn ctxt => fn t =>
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  let
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    val i_str = string_of_int i;
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    val _ = Output.legacy_feature (quote ("prem" ^ i_str)
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      ^ " term style encountered; use explicit argument syntax "
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      ^ quote ("prem " ^ i_str) ^ " instead.");
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    val prems = Logic.strip_imp_prems t;
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  in
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    if i <= length prems then nth prems (i - 1)
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    else error ("Not enough premises for prem" ^ i_str ^
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      " in propositon: " ^ Syntax.string_of_term ctxt t)
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  end);
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fun isub_symbols (d :: s :: ss) =
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      if Symbol.is_ascii_digit d andalso not (String.isPrefix ("\\<^") s)
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      then d :: "\\<^isub>" :: isub_symbols (s :: ss)
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      else d :: s :: ss
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  | isub_symbols cs = cs;
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val isub_name = implode o rev o isub_symbols o rev o Symbol.explode;
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fun isub_term (Free (n, T)) = Free (isub_name n, T)
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  | isub_term (Var ((n, idx), T)) =
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      if idx <> 0 then Var ((isub_name (n ^ string_of_int idx), 0), T)
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      else Var ((isub_name n, 0), T)
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  | isub_term (t $ u) = isub_term t $ isub_term u
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  | isub_term (Abs (n, T, b)) = Abs (isub_name n, T, isub_term b)
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  | isub_term t = t;
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val _ = Context.>> (Context.map_theory
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 (setup "lhs" (style_lhs_rhs fst) #>
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  setup "rhs" (style_lhs_rhs snd) #>
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  setup "prem" style_prem #>
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  setup "concl" (Scan.succeed (K Logic.strip_imp_concl)) #>
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  setup "isub" (Scan.succeed (K isub_term)) #>
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  setup "prem1" (style_parm_premise 1) #>
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  setup "prem2" (style_parm_premise 2) #>
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  setup "prem3" (style_parm_premise 3) #>
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  setup "prem4" (style_parm_premise 4) #>
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  setup "prem5" (style_parm_premise 5) #>
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  setup "prem6" (style_parm_premise 6) #>
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  setup "prem7" (style_parm_premise 7) #>
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  setup "prem8" (style_parm_premise 8) #>
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  setup "prem9" (style_parm_premise 9) #>
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  setup "prem10" (style_parm_premise 10) #>
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  setup "prem11" (style_parm_premise 11) #>
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  setup "prem12" (style_parm_premise 12) #>
77df12652210 generalized term styles: transformations may depend on arguments; modernized term_style module; antiquotations thm, prop and term accepting term styles
haftmann
parents: 29606
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   131
  setup "prem13" (style_parm_premise 13) #>
77df12652210 generalized term styles: transformations may depend on arguments; modernized term_style module; antiquotations thm, prop and term accepting term styles
haftmann
parents: 29606
diff changeset
   132
  setup "prem14" (style_parm_premise 14) #>
77df12652210 generalized term styles: transformations may depend on arguments; modernized term_style module; antiquotations thm, prop and term accepting term styles
haftmann
parents: 29606
diff changeset
   133
  setup "prem15" (style_parm_premise 15) #>
77df12652210 generalized term styles: transformations may depend on arguments; modernized term_style module; antiquotations thm, prop and term accepting term styles
haftmann
parents: 29606
diff changeset
   134
  setup "prem16" (style_parm_premise 16) #>
77df12652210 generalized term styles: transformations may depend on arguments; modernized term_style module; antiquotations thm, prop and term accepting term styles
haftmann
parents: 29606
diff changeset
   135
  setup "prem17" (style_parm_premise 17) #>
77df12652210 generalized term styles: transformations may depend on arguments; modernized term_style module; antiquotations thm, prop and term accepting term styles
haftmann
parents: 29606
diff changeset
   136
  setup "prem18" (style_parm_premise 18) #>
32891
d403b99287ff new generalized concept for term styles
haftmann
parents: 32890
diff changeset
   137
  setup "prem19" (style_parm_premise 19)));
22107
926afa3361e1 renamed Isar/term_style.ML to Thy/term_style.ML;
wenzelm
parents:
diff changeset
   138
926afa3361e1 renamed Isar/term_style.ML to Thy/term_style.ML;
wenzelm
parents:
diff changeset
   139
end;