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Source file sos_lib.ml

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(* ========================================================================= *)
(* - This code originates from John Harrison's HOL LIGHT 2.30                *)
(*   (see file LICENSE.sos for license, copyright and disclaimer)            *)
(*   This code is the HOL LIGHT library code used by sos.ml                  *)
(* - Laurent Théry (thery@sophia.inria.fr) has isolated the HOL              *)
(*   independent bits                                                        *)
(* - Frédéric Besson (fbesson@irisa.fr) is using it to feed  micromega       *)
(* ========================================================================= *)

(* ------------------------------------------------------------------------- *)
(* Comparisons that are reflexive on NaN and also short-circuiting.          *)
(* ------------------------------------------------------------------------- *)

(** FIXME *)
let cmp = compare

let ( =? ) x y = cmp x y = 0
let ( <? ) x y = cmp x y < 0
let ( <=? ) x y = cmp x y <= 0
let ( >? ) x y = cmp x y > 0

(* ------------------------------------------------------------------------- *)
(* Combinators.                                                              *)
(* ------------------------------------------------------------------------- *)

let o f g x = f (g x)

(* ------------------------------------------------------------------------- *)
(* Various versions of list iteration.                                       *)
(* ------------------------------------------------------------------------- *)

let rec end_itlist f l =
  match l with
  | [] -> failwith "end_itlist"
  | [x] -> x
  | h :: t -> f h (end_itlist f t)

(* ------------------------------------------------------------------------- *)
(* All pairs arising from applying a function over two lists.                *)
(* ------------------------------------------------------------------------- *)

let rec allpairs f l1 l2 =
  match l1 with
  | h1 :: t1 -> List.fold_right (fun x a -> f h1 x :: a) l2 (allpairs f t1 l2)
  | [] -> []

(* ------------------------------------------------------------------------- *)
(* String operations (surely there is a better way...)                       *)
(* ------------------------------------------------------------------------- *)

let implode l = List.fold_right ( ^ ) l ""

let explode s =
  let rec exap n l =
    if n < 0 then l else exap (n - 1) (String.sub s n 1 :: l)
  in
  exap (String.length s - 1) []

(* ------------------------------------------------------------------------- *)
(* Repetition of a function.                                                 *)
(* ------------------------------------------------------------------------- *)

let rec funpow n f x = if n < 1 then x else funpow (n - 1) f (f x)

(* ------------------------------------------------------------------------- *)
(* Sequences.                                                *)
(* ------------------------------------------------------------------------- *)

let rec ( -- ) m n = if m > n then [] else m :: (m + 1 -- n)

(* ------------------------------------------------------------------------- *)
(* Various useful list operations.                                           *)
(* ------------------------------------------------------------------------- *)

let rec tryfind f l =
  match l with
  | [] -> failwith "tryfind"
  | h :: t -> ( try f h with Failure _ -> tryfind f t )

(* ------------------------------------------------------------------------- *)
(* "Set" operations on lists.                                                *)
(* ------------------------------------------------------------------------- *)

let rec mem x lis = match lis with [] -> false | h :: t -> x =? h || mem x t
let insert x l = if mem x l then l else x :: l
let union l1 l2 = List.fold_right insert l1 l2
let subtract l1 l2 = List.filter (fun x -> not (mem x l2)) l1

(* ------------------------------------------------------------------------- *)
(* Common measure predicates to use with "sort".                             *)
(* ------------------------------------------------------------------------- *)

let increasing f x y = f x <? f y

(* ------------------------------------------------------------------------- *)
(* Iterating functions over lists.                                           *)
(* ------------------------------------------------------------------------- *)

let rec do_list f l = match l with [] -> () | h :: t -> f h; do_list f t

(* ------------------------------------------------------------------------- *)
(* Sorting.                                                                  *)
(* ------------------------------------------------------------------------- *)

let rec sort cmp lis =
  match lis with
  | [] -> []
  | piv :: rest ->
    let r, l = List.partition (cmp piv) rest in
    sort cmp l @ (piv :: sort cmp r)

(* ------------------------------------------------------------------------- *)
(* Removing adjacent (NB!) equal elements from list.                         *)
(* ------------------------------------------------------------------------- *)

let rec uniq l =
  match l with
  | x :: (y :: _ as t) ->
    let t' = uniq t in
    if x =? y then t' else if t' == t then l else x :: t'
  | _ -> l

(* ------------------------------------------------------------------------- *)
(* Convert list into set by eliminating duplicates.                          *)
(* ------------------------------------------------------------------------- *)

let setify s = uniq (sort ( <=? ) s)

(* ------------------------------------------------------------------------- *)
(* Polymorphic finite partial functions via Patricia trees.                  *)
(*                                                                           *)
(* The point of this strange representation is that it is canonical (equal   *)
(* functions have the same encoding) yet reasonably efficient on average.    *)
(*                                                                           *)
(* Idea due to Diego Olivier Fernandez Pons (OCaml list, 2003/11/10).        *)
(* ------------------------------------------------------------------------- *)

type ('a, 'b) func =
  | Empty
  | Leaf of int * ('a * 'b) list
  | Branch of int * int * ('a, 'b) func * ('a, 'b) func

(* ------------------------------------------------------------------------- *)
(* Undefined function.                                                       *)
(* ------------------------------------------------------------------------- *)

let undefined = Empty

(* ------------------------------------------------------------------------- *)
(* In case of equality comparison worries, better use this.                  *)
(* ------------------------------------------------------------------------- *)

let is_undefined f = match f with Empty -> true | _ -> false

(* ------------------------------------------------------------------------- *)
(* Operation analogous to "map" for lists.                                   *)
(* ------------------------------------------------------------------------- *)

let mapf =
  let rec map_list f l =
    match l with [] -> [] | (x, y) :: t -> (x, f y) :: map_list f t
  in
  let rec mapf f t =
    match t with
    | Empty -> Empty
    | Leaf (h, l) -> Leaf (h, map_list f l)
    | Branch (p, b, l, r) -> Branch (p, b, mapf f l, mapf f r)
  in
  mapf

(* ------------------------------------------------------------------------- *)
(* Operations analogous to "fold" for lists.                                 *)
(* ------------------------------------------------------------------------- *)

let foldl =
  let rec foldl_list f a l =
    match l with [] -> a | (x, y) :: t -> foldl_list f (f a x y) t
  in
  let rec foldl f a t =
    match t with
    | Empty -> a
    | Leaf (h, l) -> foldl_list f a l
    | Branch (p, b, l, r) -> foldl f (foldl f a l) r
  in
  foldl

let foldr =
  let rec foldr_list f l a =
    match l with [] -> a | (x, y) :: t -> f x y (foldr_list f t a)
  in
  let rec foldr f t a =
    match t with
    | Empty -> a
    | Leaf (h, l) -> foldr_list f l a
    | Branch (p, b, l, r) -> foldr f l (foldr f r a)
  in
  foldr

(* ------------------------------------------------------------------------- *)
(* Redefinition and combination.                                             *)
(* ------------------------------------------------------------------------- *)

let ( |-> ), combine =
  let ldb x y =
    let z = x lxor y in
    z land -z
  in
  let newbranch p1 t1 p2 t2 =
    let b = ldb p1 p2 in
    let p = p1 land (b - 1) in
    if p1 land b = 0 then Branch (p, b, t1, t2) else Branch (p, b, t2, t1)
  in
  let rec define_list ((x, y) as xy) l =
    match l with
    | ((a, b) as ab) :: t ->
      if x =? a then xy :: t
      else if x <? a then xy :: l
      else ab :: define_list xy t
    | [] -> [xy]
  and combine_list op z l1 l2 =
    match (l1, l2) with
    | [], _ -> l2
    | _, [] -> l1
    | ((x1, y1) as xy1) :: t1, ((x2, y2) as xy2) :: t2 ->
      if x1 <? x2 then xy1 :: combine_list op z t1 l2
      else if x2 <? x1 then xy2 :: combine_list op z l1 t2
      else
        let y = op y1 y2 and l = combine_list op z t1 t2 in
        if z y then l else (x1, y) :: l
  in
  let ( |-> ) x y =
    let k = Hashtbl.hash x in
    let rec upd t =
      match t with
      | Empty -> Leaf (k, [(x, y)])
      | Leaf (h, l) ->
        if h = k then Leaf (h, define_list (x, y) l)
        else newbranch h t k (Leaf (k, [(x, y)]))
      | Branch (p, b, l, r) ->
        if k land (b - 1) <> p then newbranch p t k (Leaf (k, [(x, y)]))
        else if k land b = 0 then Branch (p, b, upd l, r)
        else Branch (p, b, l, upd r)
    in
    upd
  in
  let rec combine op z t1 t2 =
    match (t1, t2) with
    | Empty, _ -> t2
    | _, Empty -> t1
    | Leaf (h1, l1), Leaf (h2, l2) ->
      if h1 = h2 then
        let l = combine_list op z l1 l2 in
        if l = [] then Empty else Leaf (h1, l)
      else newbranch h1 t1 h2 t2
    | (Leaf (k, lis) as lf), (Branch (p, b, l, r) as br)
     |(Branch (p, b, l, r) as br), (Leaf (k, lis) as lf) ->
      if k land (b - 1) = p then
        if k land b = 0 then
          let l' = combine op z lf l in
          if is_undefined l' then r else Branch (p, b, l', r)
        else
          let r' = combine op z lf r in
          if is_undefined r' then l else Branch (p, b, l, r')
      else newbranch k lf p br
    | Branch (p1, b1, l1, r1), Branch (p2, b2, l2, r2) ->
      if b1 < b2 then
        if p2 land (b1 - 1) <> p1 then newbranch p1 t1 p2 t2
        else if p2 land b1 = 0 then
          let l = combine op z l1 t2 in
          if is_undefined l then r1 else Branch (p1, b1, l, r1)
        else
          let r = combine op z r1 t2 in
          if is_undefined r then l1 else Branch (p1, b1, l1, r)
      else if b2 < b1 then
        if p1 land (b2 - 1) <> p2 then newbranch p1 t1 p2 t2
        else if p1 land b2 = 0 then
          let l = combine op z t1 l2 in
          if is_undefined l then r2 else Branch (p2, b2, l, r2)
        else
          let r = combine op z t1 r2 in
          if is_undefined r then l2 else Branch (p2, b2, l2, r)
      else if p1 = p2 then
        let l = combine op z l1 l2 and r = combine op z r1 r2 in
        if is_undefined l then r
        else if is_undefined r then l
        else Branch (p1, b1, l, r)
      else newbranch p1 t1 p2 t2
  in
  (( |-> ), combine)

(* ------------------------------------------------------------------------- *)
(* Special case of point function.                                           *)
(* ------------------------------------------------------------------------- *)

let ( |=> ) x y = (x |-> y) undefined

(* ------------------------------------------------------------------------- *)
(* Grab an arbitrary element.                                                *)
(* ------------------------------------------------------------------------- *)

let rec choose t =
  match t with
  | Empty -> failwith "choose: completely undefined function"
  | Leaf (h, l) -> List.hd l
  | Branch (b, p, t1, t2) -> choose t1

(* ------------------------------------------------------------------------- *)
(* Application.                                                              *)
(* ------------------------------------------------------------------------- *)

let applyd =
  let rec apply_listd l d x =
    match l with
    | (a, b) :: t ->
      if x =? a then b else if x >? a then apply_listd t d x else d x
    | [] -> d x
  in
  fun f d x ->
    let k = Hashtbl.hash x in
    let rec look t =
      match t with
      | Leaf (h, l) when h = k -> apply_listd l d x
      | Branch (p, b, l, r) -> look (if k land b = 0 then l else r)
      | _ -> d x
    in
    look f

let apply f = applyd f (fun x -> failwith "apply")
let tryapplyd f a d = applyd f (fun x -> d) a

(* ------------------------------------------------------------------------- *)
(* Undefinition.                                                             *)
(* ------------------------------------------------------------------------- *)

let undefine =
  let rec undefine_list x l =
    match l with
    | ((a, b) as ab) :: t ->
      if x =? a then t
      else if x <? a then l
      else
        let t' = undefine_list x t in
        if t' == t then l else ab :: t'
    | [] -> []
  in
  fun x ->
    let k = Hashtbl.hash x in
    let rec und t =
      match t with
      | Leaf (h, l) when h = k ->
        let l' = undefine_list x l in
        if l' == l then t else if l' = [] then Empty else Leaf (h, l')
      | Branch (p, b, l, r) when k land (b - 1) = p ->
        if k land b = 0 then
          let l' = und l in
          if l' == l then t
          else if is_undefined l' then r
          else Branch (p, b, l', r)
        else
          let r' = und r in
          if r' == r then t
          else if is_undefined r' then l
          else Branch (p, b, l, r')
      | _ -> t
    in
    und

(* ------------------------------------------------------------------------- *)
(* Mapping to sorted-list representation of the graph, domain and range.     *)
(* ------------------------------------------------------------------------- *)

let graph f = setify (foldl (fun a x y -> (x, y) :: a) [] f)
let dom f = setify (foldl (fun a x y -> x :: a) [] f)

(* ------------------------------------------------------------------------- *)
(* More parser basics.                                                       *)
(* ------------------------------------------------------------------------- *)

exception Noparse

let isspace, isnum =
  let charcode s = Char.code s.[0] in
  let spaces = " \t\n\r"
  and separators = ",;"
  and brackets = "()[]{}"
  and symbs = "\\!@#$%^&*-+|\\<=>/?~.:"
  and alphas = "'abcdefghijklmnopqrstuvwxyz_ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  and nums = "0123456789" in
  let allchars = spaces ^ separators ^ brackets ^ symbs ^ alphas ^ nums in
  let csetsize = List.fold_right (o max charcode) (explode allchars) 256 in
  let ctable = Array.make csetsize 0 in
  do_list (fun c -> ctable.(charcode c) <- 1) (explode spaces);
  do_list (fun c -> ctable.(charcode c) <- 2) (explode separators);
  do_list (fun c -> ctable.(charcode c) <- 4) (explode brackets);
  do_list (fun c -> ctable.(charcode c) <- 8) (explode symbs);
  do_list (fun c -> ctable.(charcode c) <- 16) (explode alphas);
  do_list (fun c -> ctable.(charcode c) <- 32) (explode nums);
  let isspace c = ctable.(charcode c) = 1
  and isnum c = ctable.(charcode c) = 32 in
  (isspace, isnum)

let parser_or parser1 parser2 input =
  try parser1 input with Noparse -> parser2 input

let ( ++ ) parser1 parser2 input =
  let result1, rest1 = parser1 input in
  let result2, rest2 = parser2 rest1 in
  ((result1, result2), rest2)

let rec many prs input =
  try
    let result, next = prs input in
    let results, rest = many prs next in
    (result :: results, rest)
  with Noparse -> ([], input)

let ( >> ) prs treatment input =
  let result, rest = prs input in
  (treatment result, rest)

let fix err prs input =
  try prs input with Noparse -> failwith (err ^ " expected")

let listof prs sep err =
  prs ++ many (sep ++ fix err prs >> snd) >> fun (h, t) -> h :: t

let possibly prs input =
  try
    let x, rest = prs input in
    ([x], rest)
  with Noparse -> ([], input)

let some p = function
  | [] -> raise Noparse
  | h :: t -> if p h then (h, t) else raise Noparse

let a tok = some (fun item -> item = tok)

let rec atleast n prs i =
  ( if n <= 0 then many prs
  else prs ++ atleast (n - 1) prs >> fun (h, t) -> h :: t )
    i

(* ------------------------------------------------------------------------- *)

let temp_path = Filename.get_temp_dir_name ()

(* ------------------------------------------------------------------------- *)
(* Convenient conversion between files and (lists of) strings.               *)
(* ------------------------------------------------------------------------- *)

let strings_of_file filename =
  let fd =
    try open_in filename
    with Sys_error _ -> failwith ("strings_of_file: can't open " ^ filename)
  in
  let rec suck_lines acc =
    try
      let l = input_line fd in
      suck_lines (l :: acc)
    with End_of_file -> List.rev acc
  in
  let data = suck_lines [] in
  close_in fd; data

let string_of_file filename = String.concat "\n" (strings_of_file filename)

let file_of_string filename s =
  let fd = open_out filename in
  output_string fd s; close_out fd

(* ------------------------------------------------------------------------- *)
(* Iterative deepening.                                                      *)
(* ------------------------------------------------------------------------- *)

let rec deepen f n =
  try
    (*print_string "Searching with depth limit ";
      print_int n; print_newline();*)
    f n
  with Failure _ -> deepen f (n + 1)

exception TooDeep

let deepen_until limit f n =
  match compare limit 0 with
  | 0 -> raise TooDeep
  | -1 -> deepen f n
  | _ ->
    let rec d_until f n =
      try
        (* if !debugging
           then (print_string "Searching with depth limit ";
                 print_int n; print_newline()) ;*)
        f n
      with Failure x ->
        (*if !debugging then (Printf.printf "solver error : %s\n" x) ; *)
        if n = limit then raise TooDeep else d_until f (n + 1)
    in
    d_until f n
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