Theory Printer_Pure

(******************************************************************************
 * A Meta-Model for the Isabelle API
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 *               2013-2017 IRT SystemX, France
 *               2011-2015 Achim D. Brucker, Germany
 *               2016-2018 The University of Sheffield, UK
 *               2016-2017 Nanyang Technological University, Singapore
 *               2017-2018 Virginia Tech, USA
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section‹Instantiating the Printer for (Pure) Term›

theory  Printer_Pure
imports Meta_Pure
        Printer_init
begin

context Print
begin

fun of_pure_term where "of_pure_term l e = (λ
    Const s _  To_string s
  | Free s _  To_string s
  | App t1 t2  ‹(%s) (%s)› (of_pure_term l t1) (of_pure_term l t2)
  | Abs s _ t 
      let s = To_string s in
      ‹(λ %s. %s)› s (of_pure_term (s # l) t)
  | Bound n  ‹%s› (l ! nat_of_natural n)) e"

end

lemmas [code] =
  ― ‹def›
  ― ‹fun›
  Print.of_pure_term.simps

end