68 lines
3.5 KiB
OCaml
68 lines
3.5 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Pierre Weis and Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1999 Institut National de Recherche en Informatique et *)
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(* en Automatique. Distributed only by permission. *)
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(* *)
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(***********************************************************************)
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(* Module [Buffer]: extensible string buffers *)
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(* This module implements string buffers that automatically expand
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as necessary. It provides accumulative concatenation of strings
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in quasi-linear time (instead of quadratic time when strings are
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concatenated pairwise). *)
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type t
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(* The abstract type of buffers. *)
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val create : int -> t
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(* [create n] returns a fresh buffer, initially empty.
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The [n] parameter is the initial size of the internal string
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that holds the buffer contents. That string is automatically
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reallocated when more than [n] characters are stored in the buffer,
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but shrinks back to [n] characters when [reset] is called.
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For best performance, [n] should be of the same order of magnitude
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as the number of characters that are expected to be stored in
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the buffer (for instance, 80 for a buffer that holds one output
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line). Nothing bad will happen if the buffer grows beyond that
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limit, however. In doubt, take [n = 16] for instance.
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If [n] is not between 1 and [Sys.max_string_length], it will
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be clipped to that interval. *)
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val contents : t -> string
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(* Return a copy of the current contents of the buffer.
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The buffer itself is unchanged. *)
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val length : t -> int
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(* Return the number of characters currently contained in the buffer. *)
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val clear : t -> unit
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(* Empty the buffer. *)
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val reset : t -> unit
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(* Empty the buffer and deallocate the internal string holding the
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buffer contents, replacing it with the initial internal string
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of length [n] that was allocated by [create n].
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For long-lived buffers that may have grown a lot, [reset] allows
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faster reclaimation of the space used by the buffer. *)
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val add_char : t -> char -> unit
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(* [add_char b c] appends the character [c] at the end of
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the buffer [b]. *)
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val add_string : t -> string -> unit
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(* [add_string b s] appends the string [s] at the end of
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the buffer [b]. *)
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val add_substring : t -> string -> int -> int -> unit
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(* [add_substring b s ofs len] takes [len] characters from offset
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[ofs] in string [s] and appends them at the end of the buffer [b]. *)
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val add_buffer : t -> t -> unit
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(* [add_buffer b1 b2] appends the current contents of buffer [b2]
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at the end of buffer [b1]. [b2] is not modified. *)
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val add_channel : t -> in_channel -> int -> unit
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(* [add_channel b ic n] reads exactly [n] character from the
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input channel [ic] and stores them at the end of buffer [b].
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Raise [End_of_file] if the channel contains fewer than [n]
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characters. *)
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val output_buffer : out_channel -> t -> unit
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(* [output_buffer oc b] writes the current contents of buffer [b]
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on the output channel [oc]. *)
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