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       Buffer - Extensible string buffers.


       Module   Buffer


       Module Buffer
        : sig end

       Extensible string buffers.

       This module implements string buffers that automatically expand as necessary.  It provides
       accumulative concatenation of strings in quasi-linear time (instead of quadratic time when
       strings are concatenated pairwise).

       type t

       The abstract type of buffers.

       val create : int -> t

       create  n returns a fresh buffer, initially empty.  The n parameter is the initial size of
       the internal  string  that  holds  the  buffer  contents.  That  string  is  automatically
       reallocated  when  more  than n characters are stored in the buffer, but shrinks back to n
       characters when reset is called.  For best performance, n should be of the same  order  of
       magnitude  as  the  number of characters that are expected to be stored in the buffer (for
       instance, 80 for a buffer that holds one output line).  Nothing bad  will  happen  if  the
       buffer  grows beyond that limit, however. In doubt, take n = 16 for instance.  If n is not
       between 1 and Sys.max_string_length , it will be clipped to that interval.

       val contents : t -> string

       Return a copy of the current contents of the buffer.  The buffer itself is unchanged.

       val sub : t -> int -> int -> string

       Buffer.sub b off len returns (a copy of) the substring of  the  current  contents  of  the
       buffer  b starting at offset off of length len bytes. May raise Invalid_argument if out of
       bounds request. The buffer itself is unaffected.

       val blit : t -> int -> string -> int -> int -> unit

       Buffer.blit src srcoff dst dstoff len copies len characters from the current  contents  of
       the buffer src , starting at offset srcoff to string dst , starting at character dstoff .

       Raise Invalid_argument if srcoff and len do not designate a valid substring of src , or if
       dstoff and len do not designate a valid substring of dst .

       Since 3.11.2

       val nth : t -> int -> char

       get the n-th character of the buffer. Raise Invalid_argument if index out of bounds

       val length : t -> int

       Return the number of characters currently contained in the buffer.

       val clear : t -> unit

       Empty the buffer.

       val reset : t -> unit

       Empty the buffer and deallocate the internal string holding the buffer contents, replacing
       it  with  the  initial internal string of length n that was allocated by Buffer.create n .
       For long-lived buffers that may have grown a lot, reset allows faster reclamation  of  the
       space used by the buffer.

       val add_char : t -> char -> unit

       add_char b c appends the character c at the end of the buffer b .

       val add_string : t -> string -> unit

       add_string b s appends the string s at the end of the buffer b .

       val add_substring : t -> string -> int -> int -> unit

       add_substring  b  s  ofs  len takes len characters from offset ofs in string s and appends
       them at the end of the buffer b .

       val add_substitute : t -> (string -> string) -> string -> unit

       add_substitute b f s appends the string pattern  s  at  the  end  of  the  buffer  b  with
       substitution.   The  substitution  process  looks  for  variables  into  the  pattern  and
       substitutes each variable name by its value, as obtained by applying the mapping f to  the
       variable  name.  Inside  the  string  pattern,  a  variable  name  immediately  follows  a
       non-escaped $ character and is one of the following:

       -a non empty sequence of alphanumeric or _ characters,

       -an arbitrary sequence of characters enclosed by a pair of matching parentheses  or  curly
       brackets.   An  escaped $ character is a $ that immediately follows a backslash character;
       it then stands  for  a  plain  $  .   Raise  Not_found  if  the  closing  character  of  a
       parenthesized variable cannot be found.

       val add_buffer : t -> t -> unit

       add_buffer  b1  b2 appends the current contents of buffer b2 at the end of buffer b1 .  b2
       is not modified.

       val add_channel : t -> Pervasives.in_channel -> int -> unit

       add_channel b ic n reads exactly n character from the input channel ic and stores them  at
       the end of buffer b .  Raise End_of_file if the channel contains fewer than n characters.

       val output_buffer : Pervasives.out_channel -> t -> unit

       output_buffer oc b writes the current contents of buffer b on the output channel oc .