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 * Copyright (c) Achim D. Brucker
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 * SPDX-License-Identifier: BSD-2-Clause
 * Repository:   https://git.logicalhacking.com/adbrucker/isabelle-hacks/
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chapter\<open>Code Reflection for \<close>
theory
  "Code_Reflection"
imports 
  Main
keywords
  "reflect_ML_exports" :: thy_decl
begin

subsection\<open>Reflecting exported SML code\<close>
ML\<open>
  fun reflect_local_ML_exports args trans =  let
    fun eval_ML_context ctxt = let 
      fun is_sml_file f = String.isSuffix ".ML" (Path.implode (#path f))
      val files = (map (Generated_Files.check_files_in (Context.proof_of ctxt)) args) 
      val ml_files = filter is_sml_file (map #1 (maps Generated_Files.get_files_in files))
      val ml_content = map (fn f => Syntax.read_input (#content f)) ml_files
      fun eval ml_content   = fold (fn sml => (ML_Context.exec 
                                           (fn () => ML_Context.eval_source ML_Compiler.flags sml))) 
                                   ml_content 
    in 
      (eval ml_content #> Local_Theory.propagate_ml_env) ctxt
    end
  in
    Toplevel.generic_theory eval_ML_context trans
  end


  val files_in_theory =
    (Parse.underscore >> K [] || Scan.repeat1 Parse.path_binding) --
      Scan.option (\<^keyword>\<open>(\<close> |-- Parse.!!! (\<^keyword>\<open>in\<close> 
                     |-- Parse.theory_name --| \<^keyword>\<open>)\<close>));

  val _ =
    Outer_Syntax.command \<^command_keyword>\<open>reflect_ML_exports\<close> 
      "evaluate generated Standard ML files"
      (Parse.and_list1 files_in_theory  >> (fn args => reflect_local_ML_exports args));
\<close>

export_code  Suc in SML   module_name Natural

reflect_ML_exports _

ML\<open>
open Natural
\<close>

end