- (* 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