aboutsummaryrefslogtreecommitdiffhomepage
path: root/clib/cString.ml
blob: f2242460e8a699372c21df30344b4b0bd28f73f2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2017     *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

module type S = module type of String

module type ExtS =
sig
  include S
  [@@@ocaml.warning "-3"]     (* [@@noalloc] since 4.03.0 GPR#240 *)
  external equal : string -> string -> bool = "caml_string_equal" "noalloc"
  [@@@ocaml.warning "+3"]
  val hash : string -> int
  val is_empty : string -> bool
  val explode : string -> string list
  val implode : string list -> string
  val strip : string -> string
  val drop_simple_quotes : string -> string
  val string_index_from : string -> int -> string -> int
  val string_contains : where:string -> what:string -> bool
  val plural : int -> string -> string
  val conjugate_verb_to_be : int -> string
  val ordinal : int -> string
  val split : char -> string -> string list
  val is_sub : string -> string -> int -> bool
  module Set : Set.S with type elt = t
  module Map : CMap.ExtS with type key = t and module Set := Set
  module List : CList.MonoS with type elt = t
  val hcons : string -> string
end

include String

[@@@ocaml.warning "-3"]     (* [@@noalloc] since 4.03.0 GPR#240 *)
external equal : string -> string -> bool = "caml_string_equal" "noalloc"
[@@@ocaml.warning "+3"]

let rec hash len s i accu =
  if i = len then accu
  else
    let c = Char.code (String.unsafe_get s i) in
    hash len s (succ i) (accu * 19 + c)

let hash s =
  let len = String.length s in
  hash len s 0 0

let explode s =
  let rec explode_rec n =
    if n >= String.length s then
      []
    else
      String.make 1 (String.get s n) :: explode_rec (succ n)
  in
  explode_rec 0

let implode sl = String.concat "" sl

let is_blank = function
  | ' ' | '\r' | '\t' | '\n' -> true
  | _ -> false

let is_empty s = String.length s = 0

let strip s =
  let n = String.length s in
  let rec lstrip_rec i =
    if i < n && is_blank s.[i] then
      lstrip_rec (i+1)
    else i
  in
  let rec rstrip_rec i =
    if i >= 0 && is_blank s.[i] then
      rstrip_rec (i-1)
    else i
  in
  let a = lstrip_rec 0 and b = rstrip_rec (n-1) in
  String.sub s a (b-a+1)

let drop_simple_quotes s =
  let n = String.length s in
  if n > 2 && s.[0] = '\'' && s.[n-1] = '\'' then String.sub s 1 (n-2) else s

(* substring searching... *)

(* gdzie = where, co = what *)
(* gdzie=gdzie(string) gl=gdzie(length) gi=gdzie(index) *)
let rec raw_is_sub gdzie gl gi co cl ci =
  (ci>=cl) ||
  ((String.unsafe_get gdzie gi = String.unsafe_get co ci) &&
   (raw_is_sub gdzie gl (gi+1) co cl (ci+1)))

let rec raw_str_index i gdzie l c co cl =
  (* First adapt to ocaml 3.11 new semantics of index_from *)
  if (i+cl > l) then raise Not_found;
  (* Then proceed as in ocaml < 3.11 *)
  let i' = String.index_from gdzie i c in
    if (i'+cl <= l) && (raw_is_sub gdzie l i' co cl 0) then i' else
      raw_str_index (i'+1) gdzie l c co cl

let string_index_from gdzie i co =
  if co="" then i else
    raw_str_index i gdzie (String.length gdzie)
      (String.unsafe_get co 0) co (String.length co)

let string_contains ~where ~what =
  try
    let _ = string_index_from where 0 what in true
  with
      Not_found -> false

let is_sub p s off =
  let lp = String.length p in
  let ls = String.length s in
  if ls < off + lp then false
  else
    let rec aux i =
      if lp <= i then true
      else
        let cp = String.unsafe_get p i in
        let cs = String.unsafe_get s (off + i) in
        if cp = cs then aux (succ i) else false
    in
    aux 0

let plural n s = if n<>1 then s^"s" else s

let conjugate_verb_to_be n = if n<>1 then "are" else "is"

let ordinal n =
  let s =
    if (n / 10) mod 10 = 1 then "th"
    else match n mod 10 with
    | 1 -> "st"
    | 2 -> "nd"
    | 3 -> "rd"
    | _ -> "th"
  in
  string_of_int n ^ s

(* string parsing *)

let split c s =
  let len = String.length s in
  let rec split n =
    try
      let pos = String.index_from s n c in
      let dir = String.sub s n (pos-n) in
      dir :: split (succ pos)
    with
      | Not_found -> [String.sub s n (len-n)]
  in
  if Int.equal len 0 then [] else split 0

module Self =
struct
  type t = string
  let compare = compare
end

module Set = Set.Make(Self)
module Map = CMap.Make(Self)

module List = struct
  type elt = string
  let mem id l = List.exists (fun s -> equal id s) l
  let assoc id l = CList.assoc_f equal id l
  let remove_assoc id l = CList.remove_assoc_f equal id l
  let mem_assoc id l = List.exists (fun (a,_) -> equal id a) l
  let mem_assoc_sym id l = List.exists (fun (_,b) -> equal id b) l
  let equal l l' = CList.equal equal l l'
end

let hcons = Hashcons.simple_hcons Hashcons.Hstring.generate Hashcons.Hstring.hcons ()