Theory Printer_Pure

(******************************************************************************
 * A Meta-Model for the Isabelle API
 *
 * Copyright (c) 2011-2018 Université Paris-Saclay, Univ. Paris-Sud, France
 *               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
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
 *
 *     * Neither the name of the copyright holders nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ******************************************************************************)

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