185 lines
7.6 KiB
OCaml
185 lines
7.6 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the GNU Library General Public License, with *)
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(* the special exception on linking described in file ../LICENSE. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(** String operations.
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Given a string [s] of length [l], we call character number in [s]
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the index of a character in [s]. Indexes start at [0], and we will
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call a character number valid in [s] if it falls within the range
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[[0...l-1]]. A position is the point between two characters or at
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the beginning or end of the string. We call a position valid
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in [s] if it falls within the range [[0...l]]. Note that character
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number [n] is between positions [n] and [n+1].
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Two parameters [start] and [len] are said to designate a valid
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substring of [s] if [len >= 0] and [start] and [start+len] are
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valid positions in [s].
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*)
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external length : string -> int = "%string_length"
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(** Return the length (number of characters) of the given string. *)
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external get : string -> int -> char = "%string_safe_get"
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(** [String.get s n] returns character number [n] in string [s].
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You can also write [s.[n]] instead of [String.get s n].
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Raise [Invalid_argument] if [n] not a valid character number in [s]. *)
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external set : string -> int -> char -> unit = "%string_safe_set"
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(** [String.set s n c] modifies string [s] in place,
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replacing the character number [n] by [c].
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You can also write [s.[n] <- c] instead of [String.set s n c].
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Raise [Invalid_argument] if [n] is not a valid character number in [s]. *)
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external create : int -> string = "caml_create_string"
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(** [String.create n] returns a fresh string of length [n].
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The string initially contains arbitrary characters.
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Raise [Invalid_argument] if [n < 0] or [n > ]{!Sys.max_string_length}. *)
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val make : int -> char -> string
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(** [String.make n c] returns a fresh string of length [n],
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filled with the character [c].
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Raise [Invalid_argument] if [n < 0] or [n > ]{!Sys.max_string_length}.*)
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val copy : string -> string
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(** Return a copy of the given string. *)
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val sub : string -> int -> int -> string
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(** [String.sub s start len] returns a fresh string of length [len],
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containing the substring of [s] that starts at position [start] and
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has length [len].
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Raise [Invalid_argument] if [start] and [len] do not
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designate a valid substring of [s]. *)
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val fill : string -> int -> int -> char -> unit
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(** [String.fill s start len c] modifies string [s] in place,
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replacing [len] characters by [c], starting at [start].
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Raise [Invalid_argument] if [start] and [len] do not
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designate a valid substring of [s]. *)
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val blit : string -> int -> string -> int -> int -> unit
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(** [String.blit src srcoff dst dstoff len] copies [len] characters
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from string [src], starting at character number [srcoff], to
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string [dst], starting at character number [dstoff]. It works
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correctly even if [src] and [dst] are the same string,
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and the source and destination intervals overlap.
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Raise [Invalid_argument] if [srcoff] and [len] do not
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designate a valid substring of [src], or if [dstoff] and [len]
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do not designate a valid substring of [dst]. *)
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val concat : string -> string list -> string
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(** [String.concat sep sl] concatenates the list of strings [sl],
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inserting the separator string [sep] between each. *)
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val iter : (char -> unit) -> string -> unit
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(** [String.iter f s] applies function [f] in turn to all
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the characters of [s]. It is equivalent to
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[f s.[0]; f s.[1]; ...; f s.[String.length s - 1]; ()]. *)
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val escaped : string -> string
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(** Return a copy of the argument, with special characters
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represented by escape sequences, following the lexical
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conventions of Objective Caml. If there is no special
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character in the argument, return the original string itself,
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not a copy. *)
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val index : string -> char -> int
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(** [String.index s c] returns the character number of the first
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occurrence of character [c] in string [s].
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Raise [Not_found] if [c] does not occur in [s]. *)
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val rindex : string -> char -> int
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(** [String.rindex s c] returns the character number of the last
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occurrence of character [c] in string [s].
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Raise [Not_found] if [c] does not occur in [s]. *)
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val index_from : string -> int -> char -> int
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(** [String.index_from s i c] returns the character number of the
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first occurrence of character [c] in string [s] after position [i].
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[String.index s c] is equivalent to [String.index_from s 0 c].
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Raise [Invalid_argument] if [i] is not a valid position in [s].
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Raise [Not_found] if [c] does not occur in [s] after position [i]. *)
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val rindex_from : string -> int -> char -> int
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(** [String.rindex_from s i c] returns the character number of the
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last occurrence of character [c] in string [s] before position [i+1].
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[String.rindex s c] is equivalent to
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[String.rindex_from s (String.length s - 1) c].
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Raise [Invalid_argument] if [i+1] is not a valid position in [s].
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Raise [Not_found] if [c] does not occur in [s] before position [i+1]. *)
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val contains : string -> char -> bool
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(** [String.contains s c] tests if character [c]
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appears in the string [s]. *)
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val contains_from : string -> int -> char -> bool
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(** [String.contains_from s start c] tests if character [c]
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appears in [s] after position [start].
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[String.contains s c] is equivalent to
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[String.contains_from s 0 c].
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Raise [Invalid_argument] if [start] is not a valid position in [s]. *)
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val rcontains_from : string -> int -> char -> bool
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(** [String.rcontains_from s stop c] tests if character [c]
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appears in [s] before position [stop+1].
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Raise [Invalid_argument] if [stop < 0] or [stop+1] is not a valid
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position in [s]. *)
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val uppercase : string -> string
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(** Return a copy of the argument, with all lowercase letters
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translated to uppercase, including accented letters of the ISO
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Latin-1 (8859-1) character set. *)
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val lowercase : string -> string
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(** Return a copy of the argument, with all uppercase letters
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translated to lowercase, including accented letters of the ISO
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Latin-1 (8859-1) character set. *)
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val capitalize : string -> string
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(** Return a copy of the argument, with the first character set to uppercase. *)
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val uncapitalize : string -> string
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(** Return a copy of the argument, with the first character set to lowercase. *)
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type t = string
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(** An alias for the type of strings. *)
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val compare: t -> t -> int
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(** The comparison function for strings, with the same specification as
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{!Pervasives.compare}. Along with the type [t], this function [compare]
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allows the module [String] to be passed as argument to the functors
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{!Set.Make} and {!Map.Make}. *)
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(**/**)
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external unsafe_get : string -> int -> char = "%string_unsafe_get"
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external unsafe_set : string -> int -> char -> unit = "%string_unsafe_set"
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external unsafe_blit :
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string -> int -> string -> int -> int -> unit = "caml_blit_string" "noalloc"
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external unsafe_fill :
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string -> int -> int -> char -> unit = "caml_fill_string" "noalloc"
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