* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*)
+open Printf
+
open Utils
+let pure_cache = Hashtbl.create 13
+
let rec to_constant env = function
| Ast.EConstant (loc, c) -> c
failwithf "%a: list found where constant expression expected"
Ast.string_loc loc
- | ECallGoal (loc, name, _) ->
- failwithf "%a: cannot use goal ‘%s’ in constant expression"
- Ast.string_loc loc name
+ | ECall (loc, name, args) ->
+ let expr = Ast.getvar env loc name in
+ (match expr with
+ | EGoalDefn _ ->
+ (* Goals don't return anything so they cannot be used in
+ * constant expressions. Use a function instead.
+ *)
+ failwithf "%a: cannot use goal call ‘%s’ in shell expansion"
+ Ast.string_loc loc name
- | ETacticCtor (loc, name, _) ->
- failwithf "%a: cannot use tactic ‘%s’ in constant expression"
+ | EFuncDefn (loc, func) ->
+ to_constant env (call_function env loc name args func)
+
+ | _ ->
+ failwithf "%a: cannot use ‘%s’ in constant expression"
+ Ast.string_loc loc name
+ )
+
+ | EPredCtor (loc, name, _) ->
+ failwithf "%a: cannot use predicate ‘%s’ in constant expression"
Ast.string_loc loc name
| EGoalDefn (loc, _) ->
failwithf "%a: cannot use goal in constant expression"
Ast.string_loc loc
- | ETacticDefn (loc, _) ->
- failwithf "%a: cannot use tactic in constant expression"
+ | EFuncDefn (loc, _) ->
+ failwithf "%a: cannot use function in constant expression"
+ Ast.string_loc loc
+
+ | EPredDefn (loc, _) ->
+ failwithf "%a: cannot use predicate in constant expression"
Ast.string_loc loc
and substitute env loc substs =
) substs;
Buffer.contents b
-let rec to_shell_script env loc substs =
+and to_shell_script env loc substs =
let b = Buffer.create 13 in
List.iter (
function
(* These are shell quoted so we can just concat them with space. *)
String.concat " " strs
- | ECallGoal (loc, name, _) ->
- failwithf "%a: cannot use goal ‘%s’ in shell expansion"
- Ast.string_loc loc name
+ | ECall (loc, name, args) ->
+ let expr = Ast.getvar env loc name in
+ (match expr with
+ | EGoalDefn _ ->
+ (* Goals don't return anything so they cannot be used in
+ * shell script expansions. Use a function instead.
+ *)
+ failwithf "%a: cannot use goal call ‘%s’ in shell expansion"
+ Ast.string_loc loc name
+
+ | EFuncDefn (loc, func) ->
+ expr_to_shell_string env (call_function env loc name args func)
+
+ | _ ->
+ failwithf "%a: cannot call ‘%s’ which is not a function"
+ Ast.string_loc loc name
+ )
- (* Tactics expand to the first parameter. *)
- | ETacticCtor (loc, _, []) -> Filename.quote ""
- | ETacticCtor (loc, _, (arg :: _)) -> expr_to_shell_string env arg
+ (* Predicates expand to the first parameter. *)
+ | EPredCtor (loc, _, []) -> Filename.quote ""
+ | EPredCtor (loc, _, (arg :: _)) -> expr_to_shell_string env arg
| EGoalDefn (loc, _) ->
failwithf "%a: cannot use goal in shell expansion"
Ast.string_loc loc
- | ETacticDefn (loc, _) ->
- failwithf "%a: cannot use tactic in shell expansion"
+ | EFuncDefn (loc, _) ->
+ failwithf "%a: cannot use function in shell expansion"
Ast.string_loc loc
-let rec evaluate_goal_arg env = function
+ | EPredDefn (loc, _) ->
+ failwithf "%a: cannot use predicate in shell expansion"
+ Ast.string_loc loc
+
+and run_code env loc code =
+ let code = prepare_code env loc code in
+ Sys.command code
+
+and run_code_to_string env loc code =
+ let code = prepare_code env loc code in
+ let chan = Unix.open_process_in code in
+ let b = Buffer.create 1024 in
+ (try
+ while true do
+ Buffer.add_string b (input_line chan);
+ Buffer.add_char b '\n'
+ done
+ with End_of_file -> ());
+ let st = Unix.close_process_in chan in
+ let i =
+ match st with
+ | Unix.WEXITED i -> i
+ | Unix.WSIGNALED i ->
+ failwithf "%a: killed by signal %d" Ast.string_loc loc i
+ | Unix.WSTOPPED i ->
+ failwithf "%a: stopped by signal %d" Ast.string_loc loc i in
+ i, Buffer.contents b
+
+and run_code_to_string_list env loc code =
+ let code = prepare_code env loc code in
+ let chan = Unix.open_process_in code in
+ let lines = ref [] in
+ (try while true do lines := input_line chan :: !lines done
+ with End_of_file -> ());
+ let st = Unix.close_process_in chan in
+ let i =
+ match st with
+ | Unix.WEXITED i -> i
+ | Unix.WSIGNALED i ->
+ failwithf "%a: killed by signal %d" Ast.string_loc loc i
+ | Unix.WSTOPPED i ->
+ failwithf "%a: stopped by signal %d" Ast.string_loc loc i in
+ let lines = List.rev !lines in
+ i, lines
+
+and prepare_code env loc (code, quiet) =
+ let quiet = if Cmdline.debug_flag () then false else quiet in
+ let code = to_shell_script env loc code in
+ "source " ^ Filename.quote Cmdline.prelude_sh_file ^ "\n" ^
+ "set -e\n" ^
+ (if not (Cmdline.silent ()) && not quiet then "set -x\n" else "") ^
+ "\n" ^
+ code
+
+and evaluate_goal_arg env = function
| Ast.EVar (loc, name) ->
let expr = Ast.getvar env loc name in
evaluate_goal_arg env expr
| EList (loc, exprs) ->
Ast.EList (loc, List.map (evaluate_goal_arg env) exprs)
- | ETacticCtor (loc, name, exprs) ->
- Ast.ETacticCtor (loc, name, List.map (evaluate_goal_arg env) exprs)
+ | EPredCtor (loc, name, exprs) ->
+ Ast.EPredCtor (loc, name, List.map (evaluate_goal_arg env) exprs)
- | ECallGoal (loc, name, _) ->
- (* Goals don't return anything so they cannot be used in
- * goal args. Use a function instead.
- *)
- failwithf "%a: cannot use goal ‘%s’ in goal argument"
- Ast.string_loc loc name
+ | ECall (loc, name, args) ->
+ let expr = Ast.getvar env loc name in
+ (match expr with
+ | EGoalDefn _ ->
+ (* Goals don't return anything so they cannot be used in
+ * goal args. Use a function instead.
+ *)
+ failwithf "%a: cannot use goal call ‘%s’ in goal argument"
+ Ast.string_loc loc name
+
+ | EFuncDefn (loc, func) ->
+ call_function env loc name args func
+
+ | _ ->
+ failwithf "%a: cannot call ‘%s’ which is not a function"
+ Ast.string_loc loc name
+ )
| EConstant _
| EGoalDefn _
- | ETacticDefn _ as e -> e
+ | EFuncDefn _
+ | EPredDefn _ as e -> e
+
+(* Functions are only called from goal args or when substituting
+ * into a shell script or constant expression (this may change if we
+ * implement ‘:=’ assignment for variables). This evaluates a
+ * function by running the associated shell script and parsing
+ * the output as an expression, string or list of strings.
+ *)
+and call_function env loc name args (params, returning, pure, code) =
+ (* This is used to print the function in debug and error messages only. *)
+ let debug_func =
+ sprintf "%s (%s) returning %s" name
+ (String.concat ", " (List.map (Ast.string_expr ()) args))
+ (match returning with RetExpr -> "expression"
+ | RetString -> "string"
+ | RetStrings -> "strings") in
+ Cmdline.debug "%a: running function %s" Ast.string_loc loc debug_func;
+
+ (* Evaluate function args. Must be done before updating the environment. *)
+ let args = List.map (evaluate_goal_arg env) args in
+
+ (* Create a new environment which maps the parameter names to
+ * the args.
+ *)
+ let env =
+ let params =
+ try List.combine params args
+ with Invalid_argument _ ->
+ failwithf "%a: calling function %s with wrong number of arguments, expecting %d args but got %d args"
+ Ast.string_loc loc debug_func
+ (List.length params) (List.length args) in
+ List.fold_left (fun env (k, v) -> Ast.Env.add k v env) env params in
+
+ if pure then call_function_pure env loc name returning code
+ else call_function_really env loc name returning code
+
+and call_function_really env loc name returning code =
+ match returning with
+ | RetExpr ->
+ let r, b = run_code_to_string env loc code in
+ if r <> 0 then
+ failwithf "function ‘%s’ failed with exit code %d" name r;
+ Parse.parse_expr (sprintf "function:%s" name) b
+
+ | RetString ->
+ let r, b = run_code_to_string env loc code in
+ if r <> 0 then
+ failwithf "function ‘%s’ failed with exit code %d" name r;
+ (* Remove a single trailing \n if present. *)
+ let b =
+ let len = String.length b in
+ if len > 0 && b.[len-1] = '\n' then String.sub b 0 (len-1) else b in
+ Ast.EConstant (loc, Ast.CString b)
+
+ | RetStrings ->
+ let r, lines = run_code_to_string_list env loc code in
+ let strs = List.map (fun s -> Ast.EConstant (loc, Ast.CString s)) lines in
+ EList (loc, strs)
+
+(* For pure functions, check if the function can be matched to
+ * a previously memoized result, but don't fail if this goes wrong.
+ *)
+and call_function_pure env loc name returning code =
+ let code_key =
+ try Some (to_shell_script env loc (fst code))
+ with Failure _ -> None in
+ match code_key with
+ | None -> call_function_really env loc name returning code
+ | Some code_key ->
+ let r =
+ try Some (Hashtbl.find pure_cache code_key)
+ with Not_found -> None in
+ match r with
+ | Some expr -> expr
+ | None ->
+ let expr = call_function_really env loc name returning code in
+ Hashtbl.add pure_cache code_key expr;
+ expr
git.annexia.org / goals.git / blobdiff