-let stat_fun =
- let arity_p = Const 0 in
- let arity_s = Const 1 in
- let body e o _ = function
- | [x] ->
- let t = P.start_time () in
- let r = (e.eval x) in
- let s = P.stop_time t in
- o.out (Printf.sprintf "Stat: %s,%i\n" s (List.length r));
- r
- | _ -> assert false
- in
- let txt_out o _ = function
- | [x] -> o.out "stat "; o.query x
- | _ -> assert false
- in
- {arity_p = arity_p; arity_s = arity_s; body = body; txt_out = txt_out}
-
-let log_fun xml src =
- let log_src e o x =
- let t = P.start_time () in o.query x;
- let s = P.stop_time t in
- if C.set e.conn C.Stat then o.out (Printf.sprintf "Log source: %s\n" s);
- e.eval x
- in
- let log_res e o x =
- let s = e.eval x in
- let t = P.start_time () in o.result s;
- let r = P.stop_time t in
- if C.set e.conn C.Stat then o.out (Printf.sprintf "Log: %s\n" r); s
- in
- let txt_log o =
- if xml then o.out "xml ";
- if src then o.out "source "
- in
- let arity_p = Const 0 in
- let arity_s = Const 1 in
- let body e o _ = function
- | [x] -> if src then log_src e o x else log_res e o x
- | _ -> assert false
- in
- let txt_out o _ = function
- | [x] -> o.out "log "; txt_log o; o.query x
- | _ -> assert false
- in
- {arity_p = arity_p; arity_s = arity_s; body = body; txt_out = txt_out}
-
-let align_fun =
- let aux l (v, g) =
- let c = String.length v in
- if c < l then [(String.make (l - c) ' ' ^ v), g] else [v, g]
- in
- let arity_p = Const 0 in
- let arity_s = Const 2 in
- let body e _ _ = function
- | [y; x] ->
- let l = int_of_set (e.eval y) in
- U.mql_iter (aux l) (e.eval x)
- | _ -> assert false
- in
- let txt_out o _ = function
- | [y; x] -> o.out "align "; o.query y; o.out " in "; o.query x
- | _ -> assert false
- in
- {arity_p = arity_p; arity_s = arity_s; body = body; txt_out = txt_out}
-
-let if_fun =
- let arity_p = Const 0 in
- let arity_s = Const 3 in
- let body e _ _ = function
- | [y; x1; x2] ->
- if (e.eval y) = U.mql_false then (e.eval x2) else (e.eval x1)
- | _ -> assert false
- in
- let txt_out o _ = function
- | [y; x1; x2] ->
- o.out "if "; o.query y; o.out " then "; o.query x1;
- o.out " else "; o.query x2
- | _ -> assert false
- in
- {arity_p = arity_p; arity_s = arity_s; body = body; txt_out = txt_out}
-
-let intersect_fun =
- let rec iter f = function
- | [] -> assert false
- | [head] -> f head
- | head :: tail -> U.mql_intersect (f head) (iter f tail)
- in
- let arity_p = Const 0 in
- let arity_s = Positive in
- let body e _ _ xl = iter e.eval xl in
- let txt_out o _ = function
- | [] -> assert false
- | [x1; x2] -> out_txt2 o "/\\" x1 x2
- | xl -> out_txt_ o ["intersect"] xl
- in
- {arity_p = arity_p; arity_s = arity_s; body = body; txt_out = txt_out}
-
-let union_fun =
- let arity_p = Const 0 in
- let arity_s = Any in
- let body e _ _ xl = U.mql_iter e.eval xl in
- let txt_out o _ xl = out_txt_ o [] xl
- in
- {arity_p = arity_p; arity_s = arity_s; body = body; txt_out = txt_out}
-
-let or_fun =
- let rec iter f = function
- | [] -> U.mql_false
- | head :: tail ->
- let r1 = f head in
- if r1 = U.mql_false then (iter f tail) else r1
- in
- let arity_p = Const 0 in
- let arity_s = Any in
- let body e _ _ xl = iter e.eval xl in
- let txt_out o _ = function
- | [x1; x2] -> out_txt2 o "||" x1 x2
- | xl -> out_txt_ o ["or"] xl
- in
- {arity_p = arity_p; arity_s = arity_s; body = body; txt_out = txt_out}
-
-let and_fun =
- let rec iter f = function
- | [] -> U.mql_true
- | head :: tail ->
- if f head = U.mql_false then U.mql_false else iter f tail
- in
- let arity_p = Const 0 in
- let arity_s = Any in
- let body e _ _ xl = iter e.eval xl in
- let txt_out o _ = function
- | [x1; x2] -> out_txt2 o "&&" x1 x2
- | xl -> out_txt_ o ["and"] xl
- in
- {arity_p = arity_p; arity_s = arity_s; body = body; txt_out = txt_out}
-
-let seq_fun =
- let rec iter f = function
- | [] -> U.mql_true
- | head :: tail -> ignore (f head); iter f tail
- in
- let arity_p = Const 0 in
- let arity_s = Any in
- let body e _ _ xl = iter e.eval xl in
- let txt_out o _ = function
- | [x1; x2] -> o.query x1; o.out " ;; "; o.query x2
- | xl -> out_txt_ o ["seq"] xl
- in
- {arity_p = arity_p; arity_s = arity_s; body = body; txt_out = txt_out}
-
-let proj_fun =
- let proj_group_aux p (q, v) = if q = p then U.mql_subj v else [] in
- let proj_group p a = U.mql_iter (proj_group_aux p) a in
- let proj_set p (_, g) = U.mql_iter (proj_group p) g in
- let arity_p = Const 1 in
- let arity_s = Const 1 in
- let body e _ pl xl =
- match pl, xl with
- | [p], [x] -> U.mql_iter (proj_set p) (e.eval x)
- | _ -> assert false
- in
- let txt_out o pl xl =
- match pl, xl with
- | [p], [x] -> o.out "proj "; o.path p; o.out " of "; o.query x
- | _ -> assert false
- in
- {arity_p = arity_p; arity_s = arity_s; body = body; txt_out = txt_out}
-
-let keep_fun b =
- let proj (r, _) = (r, []) in
- let keep_path l (p, v) t = if List.mem p l = b then t else (p, v) :: t in
- let keep_grp l a = List.fold_right (keep_path l) a [] in
- let keep_set l a g =
- let kg = keep_grp l a in
- if kg = [] then g else kg :: g
- in
- let keep_av l (s, g) = (s, List.fold_right (keep_set l) g []) in
- let txt_allbut o = if b then o.out "allbut " in
- let txt_path_list o l = P.flat_list o.out o.path ", " l in
- let arity_p = Any in
- let arity_s = Const 1 in
- let body e _ pl xl =
- match b, pl, xl with
- | true, [], [x] -> e.eval x
- | false, [], [x] -> List.map proj (e.eval x)
- | _, l, [x] -> List.map (keep_av l) (e.eval x)
- | _ -> assert false
- in
- let txt_out o pl xl =
- match pl, xl with
- | [], [x] -> o.out "keep "; txt_allbut o; o.query x
- | l, [x] ->
- o.out "keep "; txt_allbut o; txt_path_list o l;
- o.out " in "; o.query x
- | _ -> assert false
- in
- {arity_p = arity_p; arity_s = arity_s; body = body; txt_out = txt_out}
-
-(* external functions interface *********************************************)
-
-let get_spec = function
- | ["empty"] -> false_fun false
- | ["false"] -> false_fun true
- | ["true"] -> true_fun
- | ["not"] -> not_fun
- | ["count"] -> count_fun
- | ["stat"] -> stat_fun
- | ["log"; "text"; "result"] -> log_fun false false
- | ["log"; "text"; "source"] -> log_fun false true
- | ["diff"] -> diff_fun
- | ["xor"] -> xor_fun
- | ["sub"] -> sub_fun
- | ["meet"] -> meet_fun
- | ["eq"] -> eq_fun
- | ["le"] -> le_fun
- | ["lt"] -> lt_fun
- | ["align"] -> align_fun
- | ["if"] -> if_fun
- | ["intersect"] -> intersect_fun
- | ["union"] -> union_fun
- | ["or"] -> or_fun
- | ["and"] -> and_fun
- | ["seq"] -> seq_fun
- | ["proj"] -> proj_fun
- | ["keep"; "these"] -> keep_fun false
- | ["keep"; "allbut"] -> keep_fun true
- | p -> raise (NameError p)
-
-let check_arity p m n =
- let aux i = function
- | Const k when i = k -> ()
- | Positive when i > 0 -> ()
- | Any -> ()
- | a -> raise (ArityError (p, a, i))
- in
- aux m (get_spec p).arity_p; aux n (get_spec p).arity_s