From f2566edeecf58826a48fea95f1fb82d5391ddffa Mon Sep 17 00:00:00 2001
From: "Achim D. Brucker" <adbrucker@0x5f.org>
Date: Thu, 15 Aug 2019 20:48:07 +0100
Subject: [PATCH] Initial commit: SML Code Reflection

---
 Code_Reflection.thy | 79 +++++++++++++++++++++++++++++++++++++++++++++
 README.md           |  4 +++
 ROOT                |  1 +
 3 files changed, 84 insertions(+)
 create mode 100644 Code_Reflection.thy

diff --git a/Code_Reflection.thy b/Code_Reflection.thy
new file mode 100644
index 0000000..3ac52ef
--- /dev/null
+++ b/Code_Reflection.thy
@@ -0,0 +1,79 @@
+(***********************************************************************************
+ * Copyright (c) Achim D. Brucker
+ *
+ * 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
+ *
+ * * 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.
+ *
+ * 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 HOLDER 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.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Repository:   https://git.logicalhacking.com/adbrucker/isabelle-hacks/
+ * Dependencies: None
+ ***********************************************************************************)
+
+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
+
diff --git a/README.md b/README.md
index 1a8e89a..2aa161e 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,10 @@ older versions might be available on a dedicated branch.
 * [Nano_JSON.thy](Nano_JSON.thy) provides support for a JSON-like 
   data exchange for Isabelle/HOL.
 
+* [Code_Reflection.thy](Code_Reflection.thy) provides a new top-level 
+  command for reflecting generated SML code into Isabelle's ML 
+  environment.
+
 ## Authors
 
 Main author: [Achim D. Brucker](http://www.brucker.ch/)
diff --git a/ROOT b/ROOT
index 84372db..0ef75f4 100644
--- a/ROOT
+++ b/ROOT
@@ -4,5 +4,6 @@ session "isabelle-hacks" = "HOL" +
     Assert
     Hiding_Type_Variables
     Nano_JSON
+    Code_Reflection
   document_files
     root.tex