(* Call a goal. *)
| Ast.ECall (loc, name, args) ->
- let expr =
- try Ast.StringMap.find name env
- with Not_found ->
- failwithf "%a: goal ‘%s’ not found" Ast.string_loc loc name in
- let goal =
- match expr with
- | Ast.EGoal (loc, goal) -> goal
- | _ ->
- failwithf "%a: tried to call ‘%s’ which is not a goal"
- Ast.string_loc loc name in
- run_goal loc env name args goal
+ let goal = Ast.getgoal env loc name in
+ run_goal env loc name args goal
| Ast.ETactic (loc, name, args) ->
- (* All parameters of tactics must be simple expressions (strings,
- * in future booleans, numbers, etc).
+ (* All parameters of tactics must be simple constant expressions
+ * (strings, in future booleans, numbers, etc).
*)
- let args = List.map (simplify env) args in
- run_goal_for_tactic loc env name args
+ let args = List.map (Ast.to_constant env) args in
+ run_tactic env loc name args
(* Look up the variable and substitute it. *)
| Ast.EVar (loc, name) ->
- let expr =
- try Ast.StringMap.find name env
- with Not_found ->
- failwithf "%a: variable ‘%s’ not found" Ast.string_loc loc name in
+ let expr = Ast.getvar env loc name in
evaluate_target env expr
(* Lists are inlined when found as a target. *)
(* A string (with or without substitutions) implies *file(filename). *)
| Ast.ESubsts (loc, str) ->
- let str = substitute loc env str in
- run_goal_for_tactic loc env "file" [Ast.CString str]
+ let str = Ast.substitute env loc str in
+ run_tactic env loc "file" [Ast.CString str]
| Ast.EConstant (loc, c) ->
- run_goal_for_tactic loc env "file" [c]
+ run_tactic env loc "file" [c]
-(* Find the goal which matches the given tactic and run it.
- * Params is a list of constants.
- *)
-and run_goal_for_tactic loc env tactic const_args =
- (* Search across all goals for a matching tactic. *)
- let goals =
- let env = Ast.StringMap.bindings env in
- filter_map
- (function (name, Ast.EGoal (loc, goal)) -> Some (name, goal) | _ -> None)
- env in
- let name, goal =
- (* If there are multiple goals matching, this must choose
- * the most recently defined (XXX).
- *)
- try
- List.find
- (fun (_, (_, patterns, _, _)) ->
- List.exists (matching_pattern loc env tactic const_args) patterns)
- goals
- with
- Not_found ->
- failwithf "%a: don't know how to build %s %s"
- Ast.string_loc loc
- tactic
- (String.concat ", "
- (List.map (function Ast.CString s -> s) const_args)) in
-
- let args = [] (* XXX calculate free variables *) in
- run_goal loc env name args goal
-
-(* XXX This only does exact matches at the moment. *)
-and matching_pattern loc env tactic const_args = function
- | Ast.PTactic (loc, constructor, params)
- when tactic = constructor &&
- List.length const_args = List.length params ->
- (* Try to simplify the parameters of this pattern down
- * to constants, but don't fail here if we can't do this.
- *)
- (try
- let params = List.map (substitute loc env) params in
- let params = List.map (fun s -> Ast.CString s) params in
- const_args = params
- with Failure _ -> false
- )
-
- | Ast.PTactic _ -> false
-
- | Ast.PVar (loc, name) -> assert false
-(*
- NOT IMPLEMENTED - we need variables to contain constructors!
- (try
- let expr = Ast.StringMap.find name env in
- let expr = simplify env expr in
- with Not_found -> false
- )
-*)
-
-(* Run a named goal. *)
-and run_goal loc env name args (params, patterns, deps, code) =
- (* Substitute the args for the parameters in the environment. *)
- let params =
- try List.combine params args
- with Invalid_argument _ ->
- failwithf "%a: calling goal ‘%s’ with wrong number of arguments"
- Ast.string_loc loc name in
+(* Run a goal by name. *)
+and run_goal env loc name args (params, patterns, deps, code) =
+ (* Create a new environment which maps the parameter names to
+ * the args.
+ *)
let env =
- List.fold_left (fun env (k, v) -> Ast.StringMap.add k v env)
- env params in
+ let params =
+ try List.combine params args
+ with Invalid_argument _ ->
+ failwithf "%a: calling goal ‘%s’ with wrong number of arguments"
+ Ast.string_loc loc name in
+ List.fold_left (fun env (k, v) -> Ast.Env.add k v env) env params in
- (* Evaluate the dependencies first. *)
+ (* Check all dependencies have been updated. *)
evaluate_targets env deps;
- (* Check if any target needs to be updated. *)
- (* XXX *)
+ (* Check if any target (ie. pattern) needs to be rebuilt. *)
+ let rebuild =
+ List.exists (needs_rebuild env loc name deps) patterns in
- (* Run the code (if any). *)
- (match code with
- | None -> ()
- | Some code ->
- let code = substitute loc env code in
- Printf.printf "running : %s\n" code
- );
+ if rebuild then (
+ (* Run the code (if any). *)
+ (match code with
+ | None -> ()
+ | Some code ->
+ let code = Ast.substitute env loc code in
+ Printf.printf "running : %s\n" code
+ );
- (* Check all targets were updated (else it's an error). *)
- (* XXX *)
+ (* Check all targets were updated (else it's an error). *)
+ let pattern_still_needs_rebuild =
+ try Some (List.find (needs_rebuild env loc name deps) patterns)
+ with Not_found -> None in
+ match pattern_still_needs_rebuild with
+ | None -> ()
+ | Some pattern ->
+ failwithf "%a: goal ‘%s’ ran successfully but it did not rebuild %a"
+ Ast.string_loc loc
+ name
+ Ast.string_pattern pattern
+ )
-(* Take any expression and simplify it down to a constant.
- * If the expression cannot be simplified then this throws
- * an error.
+(* Return whether the target (pattern) needs to be rebuilt. *)
+and needs_rebuild env loc name deps pattern =
+ match pattern with
+ | Ast.PTactic (loc, tactic, targs) ->
+ (* Resolve the targs down to constants. *)
+ let targs = List.map (Ast.substitute env loc) targs in
+ (* XXX Look up the tactic.
+ * We would do that, but for now hard code the *file tactic. XXX
+ *)
+ assert (tactic = "file");
+ assert (List.length targs = 1);
+ let targ = List.hd targs in
+ not (Sys.file_exists targ)
+ | Ast.PVar _ -> assert false (* XXX not implemented *)
+
+(* Find the goal which matches the given tactic and run it.
+ * cargs is a list of parameters (all constants).
*)
-and simplify env = function
- | Ast.EConstant (loc, c) -> c
+and run_tactic env loc tactic cargs =
+ (* Find all goals in the environment. Returns a list of (name, goal). *)
+ let goals =
+ let env = Ast.Env.bindings env in
+ filter_map
+ (function
+ | name, Ast.EGoal (loc, goal) -> Some (name, goal)
+ | _ -> None) env in
- | Ast.EVar (loc, name) ->
- let expr =
- try Ast.StringMap.find name env
- with Not_found ->
- failwithf "%a: variable ‘%s’ not found" Ast.string_loc loc name in
- simplify env expr
+ (* Find all patterns. Returns a list of (pattern, name, goal). *)
+ let patterns : (Ast.pattern * Ast.id * Ast.goal) list =
+ List.flatten
+ (List.map (fun (name, ((_, patterns, _, _) as goal)) ->
+ List.map (fun pattern -> (pattern, name, goal)) patterns) goals) in
- | Ast.ESubsts (loc, str) ->
- Ast.CString (substitute loc env str)
+ (* Find any patterns (ie. tactics) which match the one we
+ * are searching for. This returns a binding for the goal args,
+ * so we end up with a list of (pattern, name, goal, args).
+ *)
+ let patterns : (Ast.pattern * Ast.id * Ast.goal * Ast.expr list) list =
+ filter_map (
+ fun (pattern, name, ((params, _, _, _) as goal)) ->
+ match matching_pattern env loc tactic cargs pattern params with
+ | None -> None
+ | Some args -> Some (pattern, name, goal, args)
+ ) patterns in
- | Ast.EList (loc, _) ->
- failwithf "%a: list found where constant expression expected"
- Ast.string_loc loc
+ let _, name, goal, args =
+ match patterns with
+ | [p] -> p
+ | [] ->
+ let t = Ast.ETactic (loc, tactic,
+ List.map (fun c -> Ast.EConstant (loc, c))
+ cargs) in
+ failwithf "%a: don't know how to build %a"
+ Ast.string_loc loc Ast.string_expr t
+ | _ ->
+ (* If there are multiple matching goals, then assuming the goals
+ * are different we must pick the one which was defined last in
+ * the file. However we don't do that right now. XXX
+ *)
+ assert false (* TODO! *) in
- | Ast.ECall (loc, name, _) ->
- failwithf "%a: cannot use goal ‘%s’ in constant expression"
- Ast.string_loc loc name
+ run_goal env loc name args goal
- | Ast.ETactic (loc, name, _) ->
- failwithf "%a: cannot use tactic ‘*%s’ in constant expression"
- Ast.string_loc loc name
+(* Test if pattern matches *tactic(cargs). If it does
+ * then we return Some args where args is the arguments that must
+ * be passed to the matching goal. The params parameter is
+ * the names of the parameters of that goal.
+ *)
+and matching_pattern env loc tactic cargs pattern params =
+ match pattern with
+ | Ast.PVar (loc, name) -> assert false (* TODO! *)
+ | Ast.PTactic (loc, ttactic, targs)
+ when tactic <> ttactic ||
+ List.length cargs <> List.length targs ->
+ None (* Can't possibly match if tactic name or #args is different. *)
+ | Ast.PTactic (loc, ttactic, targs) ->
+ (* Do the args match with a possible params binding? *)
+ try Some (matching_params env loc params targs cargs)
+ with Not_found -> None
- | Ast.EGoal (loc, _) ->
- failwithf "%a: cannot use goal in constant expression"
- Ast.string_loc loc
+(* Return a possible binding. For example the goal is:
+ * goal compile (name) = "%name.o": "%name.c" {}
+ * which means that params = ["name"] and targs = ["%name.o"].
+ *
+ * If we are called with cargs = ["file1.o"], we would
+ * return ["file1"].
+ *
+ * On non-matching this raises Not_found.
+ *)
+and matching_params env loc params targs cargs =
+ (* This is going to record the resulting binding. *)
+ let res = ref Ast.Env.empty in
+ List.iter2 (matching_param env loc params res) targs cargs;
+
+ (* Rearrange the result into goal parameter order. Also this
+ * checks that every parameter got a binding.
+ *)
+ let res = !res in
+ List.map (
+ (* Allow the Not_found exception to escape if no binding for this param. *)
+ fun param -> Ast.Env.find param res
+ ) params
-(* Take a substitution list and try to turn it into a simple
- * string by evaluating every variable. If not possible this
- * throws an error. Returns a string.
+(* If targ = "%name.o" and carg = "file.o" then this would set
+ * name => "file" in !res. If they don't match, raises Not_found.
*)
-and substitute loc env substs =
- let b = Buffer.create 13 in
- List.iter (
- function
- | Ast.SString s -> Buffer.add_string b s
- | Ast.SVar name ->
- let expr =
- try Ast.StringMap.find name env
- with Not_found ->
- failwithf "%a: variable ‘%s’ not found" Ast.string_loc loc name in
- match simplify env expr with
- | Ast.CString s -> Buffer.add_string b s
- ) substs;
- Buffer.contents b
+and matching_param env loc params res targ carg =
+ match carg with
+ | Ast.CString carg ->
+ (* Substitute any non parameters in targ from the environment. *)
+ let targ =
+ List.map (
+ function
+ | Ast.SString _ as s -> s
+ | Ast.SVar name ->
+ if not (List.mem name params) then (
+ try
+ let expr = Ast.getvar env loc name in
+ match Ast.to_constant env expr with
+ | Ast.CString s -> Ast.SString s
+ with Failure _ -> raise Not_found
+ )
+ else
+ Ast.SVar name
+ ) targ in
+
+ (* Do the actual pattern matching. Any remaining SVar elements
+ * must refer to goal parameters.
+ *)
+ let carg = ref carg in
+ let rec loop = function
+ | [] ->
+ (* End of targ, we must have matched all of carg. *)
+ if !carg <> "" then raise Not_found
+ | Ast.SString s :: rest ->
+ (* Does this match the first part of !carg? *)
+ let clen = String.length !carg in
+ let slen = String.length s in
+ if slen > clen || s <> String.sub !carg 0 slen then
+ raise Not_found;
+ (* Yes, so continue after the matching prefix. *)
+ carg := String.sub !carg slen (clen-slen);
+ loop rest
+ | Ast.SVar name :: Ast.SString s :: rest ->
+ (* This is a goal parameter. Find s later in !carg. *)
+ let i = string_find !carg s in
+ if i = -1 then raise Not_found;
+ (* Set the binding in !res. *)
+ let r = Ast.EConstant (Ast.noloc,
+ Ast.CString (String.sub !carg 0 i)) in
+ res := Ast.Env.add name r !res;
+ (* Continue after the match. *)
+ let skip = i + String.length s in
+ carg := String.sub !carg skip (String.length !carg - skip);
+ loop rest
+ | Ast.SVar name :: [] ->
+ (* Matches the whole remainder of the string. *)
+ let r = Ast.EConstant (Ast.noloc, Ast.CString !carg) in
+ res := Ast.Env.add name r !res
+ | Ast.SVar x :: Ast.SVar y :: _ ->
+ (* TODO! We cannot match a target like "%x%y". *)
+ assert false
+ in
+ loop targ
git.annexia.org / goals.git / blobdiff