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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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 (Proof_Context.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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(* 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 (Proof_Context.theory_of ctxt) (Logic.strip_imp_concl t)
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  in
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    (case concl of
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      (_ $ 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 = Parse.nat >> (fn i => fn ctxt => fn t =>
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  let
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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
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      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 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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end;