* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*)
-let evaluate env exprs =
- ()
+open Utils
+
+let rec evaluate_targets env exprs =
+ List.iter (evaluate_target env) exprs
+
+and evaluate_target env = function
+ | Ast.EGoal goal -> assert false
+
+ (* This could be an instruction to call a goal, or it
+ * could be a tactic.
+ *)
+ | Ast.ECall ("file", [filename]) (* XXX define tactics! *) ->
+ (* All parameters of tactics must be simple expressions (strings,
+ * in future booleans, numbers, etc).
+ *)
+ let args = [filename] in
+ let args = List.map (simplify env) args in
+ run_goal_for_tactic env "file" args
+
+ | Ast.ECall ("file", _) ->
+ failwith "file tactic called with wrong number of parameters"
+
+ | Ast.ECall (name, args) ->
+ let expr =
+ try Ast.StringMap.find name env
+ with Not_found -> failwithf "%s: goal not found" name in
+ let goal =
+ match expr with
+ | Ast.EGoal goal -> goal
+ | _ ->
+ failwithf "%s: tried to call something which is not a goal" name in
+ run_goal env name args goal
+
+ (* Look up the variable and substitute it. *)
+ | Ast.EVar name ->
+ let expr =
+ try Ast.StringMap.find name env
+ with Not_found -> failwithf "%s: variable not found" name in
+ evaluate_target env expr
+
+ (* Lists are inlined when found as a target. *)
+ | Ast.EList exprs ->
+ evaluate_targets env exprs
+
+ (* A string (with or without substitutions) implies file (filename). *)
+ | Ast.ESubsts str ->
+ let str = substitute env str in
+ run_goal_for_tactic env "file" [Ast.CString str]
+
+ | Ast.EConstant c ->
+ run_goal_for_tactic env "file" [c]
+
+(* Find the goal which matches the given tactic and run it.
+ * Params is a list of constants.
+ *)
+and run_goal_for_tactic 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 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 env tactic const_args) patterns)
+ goals
+ with
+ Not_found ->
+ failwithf "don't know how to build %s %s"
+ tactic
+ (String.concat ", "
+ (List.map (function Ast.CString s -> s) const_args)) in
+
+ let args = [] (* XXX calculate free variables *) in
+ run_goal env name args goal
+
+(* XXX This only does exact matches at the moment. *)
+and matching_pattern env tactic const_args = function
+ | PTactic (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 env) params in
+ let params = List.map (fun s -> Ast.CString s) params in
+ const_args = params
+ with Failure _ -> false
+ )
+
+ | PTactic _ -> false
+
+ | PVar 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 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 "%s: calling goal with wrong number of arguments" name in
+ let env =
+ List.fold_left (fun env (k, v) -> Ast.StringMap.add k v env)
+ env params in
+
+ (* Evaluate the dependencies first. *)
+ evaluate_targets env deps;
+
+ (* Check if any target needs to be updated. *)
+ (* XXX *)
+
+ (* Run the code (if any). *)
+ (match code with
+ | None -> ()
+ | Some code ->
+ let code = substitute env code in
+ Printf.printf "running : %s\n" code
+ );
+
+ (* Check all targets were updated (else it's an error). *)
+ (* XXX *)
+
+(* Take any expression and simplify it down to a constant.
+ * If the expression cannot be simplified then this throws
+ * an error.
+ *)
+and simplify env = function
+ | Ast.EConstant c -> c
+
+ | Ast.EVar name ->
+ let expr =
+ try Ast.StringMap.find name env
+ with Not_found -> failwithf "%s: variable not found" name in
+ simplify env expr
+
+ | Ast.ESubsts str ->
+ Ast.CString (substitute env str)
+
+ | Ast.EList _ ->
+ failwith "list found where constant expression expected"
+
+ | Ast.ECall (name, _) ->
+ failwithf "%s: cannot use goal or tactic in constant expression" name
+
+ | Ast.EGoal _ ->
+ failwith "cannot use in constant expression"
+
+(* 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.
+ *)
+and substitute 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 "%s: variable not found" name in
+ match simplify env expr with
+ | Ast.CString s -> Buffer.add_string b s
+ ) substs;
+ Buffer.contents b
git.annexia.org / goals.git / commitdiff