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