src/HOL/Tools/Quickcheck/narrowing_generators.ML
author wenzelm
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(*  Title:      HOL/Tools/Quickcheck/narrowing_generators.ML
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    Author:     Lukas Bulwahn, TU Muenchen
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Narrowing-based counterexample generation.
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*)
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signature NARROWING_GENERATORS =
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sig
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  val compile_generator_expr:
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    Proof.context -> term -> int -> term list option * Quickcheck.report option
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  val put_counterexample: (unit -> term list option) -> Proof.context -> Proof.context
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  val setup: theory -> theory
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end;
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structure Narrowing_Generators : NARROWING_GENERATORS =
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struct
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val target = "Haskell"
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(* invocation of Haskell interpreter *)
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val narrowing_engine = File.read (Path.explode "~~/src/HOL/Tools/Quickcheck/Narrowing_Engine.hs")
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fun exec verbose code =
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  ML_Context.exec (fn () => Secure.use_text ML_Env.local_context (0, "generated code") verbose code)
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fun value ctxt (get, put, put_ml) (code, value) =
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  let
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    val tmp_prefix = "Quickcheck_Narrowing"
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    fun run in_path = 
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      let
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        val code_file = Path.append in_path (Path.basic "Code.hs")
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        val narrowing_engine_file = Path.append in_path (Path.basic "Narrowing_Engine.hs")
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        val main_file = Path.append in_path (Path.basic "Main.hs")
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        val main = "module Main where {\n\n" ^
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          "import Narrowing_Engine;\n" ^
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          "import Code;\n\n" ^
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          "main = Narrowing_Engine.smallCheck 7 (Code.value ())\n\n" ^
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          "}\n"
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        val code' = prefix "module Code where {\n\ndata Typerep = Typerep String [Typerep];\n"
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          (unprefix "module Code where {" code)
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        val _ = File.write code_file code'
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        val _ = File.write narrowing_engine_file narrowing_engine
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        val _ = File.write main_file main
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        val executable = Path.implode (Path.append in_path (Path.basic "isa_lsc"))
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        val cmd = "\"$EXEC_GHC\" -fglasgow-exts " ^
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          (space_implode " " (map Path.implode [code_file, narrowing_engine_file, main_file])) ^
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          " -o " ^ executable ^ " && " ^ executable
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      in
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        bash_output cmd
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      end
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    val result = Isabelle_System.with_tmp_dir tmp_prefix run
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    val output_value = the_default "NONE"
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      (try (snd o split_last o filter_out (fn s => s = "") o split_lines o fst) result)
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    val ml_code = "\nval _ = Context.set_thread_data (SOME (Context.map_proof (" ^ put_ml
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      ^ " (fn () => " ^ output_value ^ ")) (ML_Context.the_generic_context ())))";
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    val ctxt' = ctxt
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      |> put (fn () => error ("Bad evaluation for " ^ quote put_ml))
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      |> Context.proof_map (exec false ml_code);
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  in get ctxt' () end;
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fun evaluation cookie thy evaluator vs_t args =
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  let
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    val ctxt = ProofContext.init_global thy;
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    val (program_code, value_name) = evaluator vs_t;
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    val value_code = space_implode " "
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      (value_name :: "()" :: map (enclose "(" ")") args);
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  in Exn.interruptible_capture (value ctxt cookie) (program_code, value_code) end;
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fun dynamic_value_strict cookie thy postproc t args =
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  let
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    fun evaluator naming program ((_, vs_ty), t) deps =
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      evaluation cookie thy (Code_Target.evaluator thy target naming program deps) (vs_ty, t) args;
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  in Exn.release (Code_Thingol.dynamic_value thy (Exn.map_result o postproc) evaluator t) end;
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(* counterexample generator *)
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structure Counterexample = Proof_Data
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(
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  type T = unit -> term list option
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  fun init _ () = error "Counterexample"
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)
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val put_counterexample =  Counterexample.put
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fun compile_generator_expr ctxt t size =
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  let
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    val thy = ProofContext.theory_of ctxt
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    fun ensure_testable t =
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      Const (@{const_name Quickcheck_Narrowing.ensure_testable}, fastype_of t --> fastype_of t) $ t
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    val t = dynamic_value_strict
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      (Counterexample.get, Counterexample.put, "Narrowing_Generators.put_counterexample")
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      thy (Option.map o map) (ensure_testable t) []
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  in
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    (t, NONE)
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  end;
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val setup =
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  Context.theory_map
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    (Quickcheck.add_generator ("narrowing", compile_generator_expr))
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end;