src/Pure/ML/ml_antiquotation.ML

made tactic more robust w.r.t. equations containing 'case_prod'

(*  Title:      Pure/ML/ml_antiquotation.ML
    Author:     Makarius

ML antiquotations.
*)

signature ML_ANTIQUOTATION =
sig
  val declaration: binding -> 'a context_parser ->
    (Token.src -> 'a -> Proof.context -> ML_Context.decl * Proof.context) ->
    theory -> theory
  val inline: binding -> string context_parser -> theory -> theory
  val value: binding -> string context_parser -> theory -> theory
end;

structure ML_Antiquotation: ML_ANTIQUOTATION =
struct

(* define antiquotations *)

fun declaration name scan body =
  ML_Context.add_antiquotation name
    (fn src => fn orig_ctxt =>
      let val (x, _) = Token.syntax scan src orig_ctxt
      in body src x orig_ctxt end);

fun inline name scan =
  declaration name scan (fn _ => fn s => fn ctxt => (K ("", s), ctxt));

fun value name scan =
  declaration name scan (fn _ => ML_Context.value_decl (Binding.name_of name));


(* basic antiquotations *)

val _ = Theory.setup
 (declaration (Binding.make ("here", @{here})) (Scan.succeed ())
    (fn src => fn () =>
      ML_Context.value_decl "position" (ML_Syntax.print_position (#2 (Token.name_of_src src)))) #>

  value (Binding.make ("binding", @{here}))
    (Scan.lift (Parse.position Args.name) >> ML_Syntax.make_binding));

end;