1 exception ParsingError of string;;
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3 let mk_app x y = Num.mk_app x y;;
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4 let mk_lam x = `Lam(true, x);;
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5 let mk_var x = `Var(x, -666);;
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7 let isAlphaNum c = let n = Char.code c in
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8 (48 <= n && n <= 90) || (95 <= n && n <= 122) ;;
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9 let isSpace c = c = ' ' || c = '\n' || c = '\t' ;;
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12 let mk_var' (bound, free) x =
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14 then free, mk_var (Util.index_of x bound)
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15 else if List.mem x free
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16 then free, mk_var (List.length bound + Util.index_of x free)
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17 else (free @ [x]), mk_var (List.length bound + List.length free)
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20 let mk_app' = function
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21 | [] -> raise (ParsingError "bug")
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22 | t :: ts -> List.fold_left mk_app t ts
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27 if i < 0 then l else aux (i - 1) (s.[i] :: l)
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28 in aux (String.length s - 1) []
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32 let res = String.create (List.length l) in
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33 let rec aux i = function
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35 | c :: l -> res.[i] <- c; aux (i + 1) l in
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39 let rec strip_spaces = function
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40 | c::cs when isSpace c -> strip_spaces cs
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45 let rec aux = function
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47 | c::cs as x -> if isAlphaNum c
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48 then match aux cs with
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49 | (Some x), cs' -> Some (c :: x), cs'
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50 | None, cs' -> (Some [c]), cs'
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53 | None, y -> None, y
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54 | Some x, y -> Some (implode x), y
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57 let read_var' (bound, free as vars) s =
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58 match read_var s with
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59 | Some varname, cs ->
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60 let free, v = mk_var' vars varname in
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61 Some [v], cs, (bound, free)
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62 | _, _ -> raise (ParsingError ("Can't read variable"))
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65 let rec read_smt vars =
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66 let check_if_lambda cs = match read_var cs with
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68 | Some x, cs -> match strip_spaces cs with
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71 in let read_lambda (bound, free) cs = (
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72 match read_var (strip_spaces cs) with
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73 | Some varname, cs ->
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74 let vars' = (varname::bound, free) in
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75 (match strip_spaces cs with
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76 | [] -> raise (ParsingError "manca dopo variabile lambda")
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77 | c::cs -> (if c = '.' then (match read_smt vars' cs with
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78 | None, _, _ -> raise (ParsingError "manca corpo lambda")
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79 | Some [x], y, (_, free) -> Some [mk_lam x], y, (bound, free)
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80 | Some _, _, _ -> raise (ParsingError "???")
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81 ) else raise (ParsingError "manca . nel lambda")
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83 | _, _ -> assert false
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84 ) in let rec aux vars cs =
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85 match strip_spaces cs with
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86 | [] -> None, [], vars
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88 let tms, cs, vars = (
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89 if c = '(' then read_pars vars x
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90 else if c = ')' then (None, x, vars)
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91 else if check_if_lambda x then read_lambda vars x
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92 else read_var' vars x) in
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95 match aux vars cs with
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96 | None, cs, vars -> Some [tm], cs, vars
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97 | Some ts, cs, vars -> Some (tm :: ts), cs, vars
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99 | Some _ -> raise (ParsingError "bug")
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100 | None -> None, x, vars
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101 in fun cs -> match aux vars cs with
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102 | None, cs, vars -> None, cs, vars
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103 | Some ts, cs, vars -> Some [mk_app' ts], cs, vars
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104 and read_pars vars = function
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105 | [] -> None, [], vars
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106 | c::cs -> if c = '(' then (
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107 let tm, cs, vars = read_smt vars cs in
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108 let cs = strip_spaces cs in
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110 | [] -> None, [], vars
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111 | c::cs -> if c = ')' then tm, cs, vars else raise (ParsingError ") mancante")
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112 ) else raise (ParsingError "???")
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116 match read_smt ([],[]) (explode x) with
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117 | Some [y], [], _ -> y
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118 | _, _, _ -> raise (ParsingError "???")
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121 let var_zero = "ω";; (* w is an invalid variable name *)
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123 let parse_many strs =
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124 let f (x, y) z = match read_smt y (explode z) with
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125 | Some[tm], [], vars -> (tm :: x, vars)
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126 | _, _, _ -> raise (ParsingError "???")
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127 in let aux = List.fold_left f ([], ([], [var_zero])) (* index zero is reserved *)
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128 in let (tms, (_, free)) = aux strs
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129 in (List.rev tms, free)
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132 (**********************************************************************
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134 let rec string_of_term = function
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135 | Tvar n -> string_of_int n
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136 | Tapp(t1, t2) -> "(" ^ string_of_term t1 ^ " " ^ string_of_term t2 ^ ")"
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137 | Tlam(t1) -> "(\\" ^ string_of_term t1 ^ ")"
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140 let _ = prerr_endline (">>>" ^ string_of_term (parse "(\\x. x y z z1 k) z1 z j"));;
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143 **********************************************************************)
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146 let (tms, free) = parse_many strs in
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147 (* Replace pacmans and bottoms *)
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148 let n_bot = try Util.index_of "BOT" free with Not_found -> min_int in
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149 let n_pac = try Util.index_of "PAC" free with Not_found -> min_int in
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150 let n_bomb = try Util.index_of "BOMB" free with Not_found -> min_int in
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152 if v = lev + n_bot then failwith "Example with `Bottom"
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153 else if v = lev + n_pac then failwith "Example with `Pacman"
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154 else if v = lev + n_bomb then failwith "Example with `Bomb"
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155 else `Var(v,1) in (* 1 by default when variable not applied *)
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158 let rec aux lev : nf -> nf = function
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159 | `I((n,_), args) -> `I((n,1 + Listx.length args), Listx.map (fun t -> aux lev t) args)
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160 | `Var(n,_) -> fix lev n
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161 | `Lam(_,t) -> `Lam (true, aux (lev+1) t)
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162 | `Match _ | `N _ -> assert false in
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163 List.map (aux 0) (tms :> Num.nf list), free
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166 let parse_problem s = failwith "TODO";
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